Physics in Canada La Physique au Canada J>
Transcription
Physics in Canada La Physique au Canada J>
Physics in Canada La Physique au Canada Vol. 44 No. 4 July/juillet 1988 .W\FF I 1 an4 W y W ^ - j f J> f ^ i ' , A NEW PINNACLE in spectroscopy amplifiers ORTEC's 672 Spectroscopy Amplifier ® Automatic Pole-Zero A d j u s t m e n t * makes setup w i t h any d e t e c t o r easy. Automatic noise d i s c r i m iminators o n b o t h t h e p i l e u p rejector and t h e BLR e l i m i n a t e all screwdriver a d j u s t m e n t . Automatic BLR rate for superior p e r f o r m a n c e at b o t h l o w and h i g h c o u n t i n g rates. Automatic c o m p e n s a t i o n f o r reset recovery w i t h transistor reset preamplifiers. C h o i c e of triangular and Gaussian filters effectively d o u b l e s t h e n u m b e r of t i m e constants available — for o p t i m u m r e s o l u t i o n Differential input for reduction of g r o u n d l o o p noise. •Patent applied for Stop searching for your screwdriver a n d ask for a free d e m o n s t r a t i o n of t h e 672 Spectroscopy Amplifier. Call t h e USA HOTLINE, 800-251-9750, or y o u r local representative: n EOKO INSTRUMENTS Division EGc.CS Canada Ltd. 205 RIVIERA DRIVE, SUITE 5 M A R K H A M (TORONTO) ONTARIO CANADA L3R 5J8 TELEPHONE: (416) 475-8420 TELEX: 06-966615 The Bulletin of The Canadian Association of Physicists Bulletin de l'Association canadienne des physiciens EDITORIAL BOARD/COMITÉ DE RÉDACTION Editor/Rédacteur en chef j. Rolfe Bank of Canada, 234 Wellington St., Ottawa, Ontario K1A 0G9 (613) 782-8906 Associate Editor/Rédacteur Associé M.L. Jento Managing/Administration Physics in Canada La Physique au Canada Vol. 44, No. 4 July/juillet 1988 Page N o . Science Policy The President W r i t e s / T h e Minister Replies 82/83 A t o m i c Energy of Canada L i m i t e d A p p l i c a t i o n s of Accelerators by J.H. O r m r o d a n d J. U n g r i n 84 Intercalation Batteries: P r o b i n g Solid State Physics Using Electrochemistry by J.R. D a h n a n d W.R. M c K i n n o n 93 Book Review Editor/Rédacteur à la critique des livres G.R. Hébert Dept. of Physics, York University 4700 Keele St. North York, Ont. M3) 1P3 (416) 736-2100 X 3837 A m e r i c a n Association of Physics Teachers 1987 M i l l i k a n Lecture A w a r d Recipient: D o n a l d G l e n n Ivey 100 " E d u c a t i o n a l television — A n o x y m o r o n ? " by D o n a l d C. Ivey 101 W i t h o u t a Past does Canada have a Future in Physics? by J. W i l l i a m M c G o w a n 108 J.C. Cook Division of Physics, National Research Council, Montreal Rd., Ottawa, Ontario K1A 0R6 (613) 993-9407 Departments/ Rubriques G. Dolling Chalk River Nuclear Laboratories, Chalk River, Ontario K0J 1J0 (613) 584-3311 CAP Affairs/Affaires de I'ACP 110 News/Nouvelles 112 Obituaries/Necrologie 112 Béla |oos University of Ottawa, Ottawa, Ont. K1N 6N5 (613) 564-3460 Calendar/Calendrier 113 C o r p o r a t e M e m b e r s / M e m b r e s Corporatifs 114 Books Received/Livres reçus 115 Book Reviews/Critiques des livres 116 |ohn A Nilson 1778 Gilbert Ottawa, Ont. K2C 1A4 (613) 225-5426 R.H. Pack wood Physical Metallurgy Research Laboratories E-M-R 568 Booth St. Ottawa, Ont. (613) 992-2288 René Roy Département de physique Université Laval Cité Universitaire Québec (Québec) G1K 7P4 (418) 656-2655 ANNUAL SUBSCRIPTION RATE/ ABONNEMENT PAR AN $20.00 ADVERTISING, SUBSCRIPTIONS, CHANGE OF ADDRESS PUBLICITE, ABONNEMENT, CHANGEMENT D'ADRESSE : Canadian Association of Physicists Association canadienne des physiciens Suite 903, 151 Slater Street Ottawa, Ontario KIP 5H3 Phone: (613) 237-3392 BITNET: WCSCAP @ Carleton FAX: (613) 238-1677 Front Cover: Artist: Sekerka © Sekerka Typesetting, Layout and Printing: T r i - G r a p h i c P r i n t i n g ( O t t a w a ) L i m i t e d Advertising Rates Effective January 1988 Full Page Half Page Quarter Page Fourth Cover Second & Third Cover Single Issue Jan. March July Sept. Nov. 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ONTARIO K1P 5H3 ASSOCIATION CANADIENNE DES PHYSICIENS TELEPHONE: (613) 237-3392 The H o n o r a b l e Robert de C ô t r e t M i n i s t e r of Industry, Science a n d T e c h n o l o g y House of C o m m o n s Ottawa, O n t a r i o K1A 0A6 Dear M r . d e Côtret: T h e Canadian Association of Physicists w o u l d like t o d r a w t o y o u r a t t e n t i o n a serious p r o b l e m facing t h e industrial, scientific and t e c h n i c a l c o m m u n i t y , w h i c h m i g h t be solved f o l l o w i n g t h e c r e a t i o n of t h e new d e p a r t m e n t D.I.S.T. This p r o b l e m is related t o t h e h i g h - t e c h subsidies a w a r d e d by many c o u n t r i e s (e.g. U.S.A., Britain, France) w h e n they grant G o v e r n m e n t contracts t o d o m e s t i c industries in areas c o v e r e d by t h e " N a t i o n a l S e c u r i t y " interest. These contracts allow h i g h - t e c h p r o d u c t s t o be d e v e l o p e d , a n d n e w - b o r n fragile h i g h - t e c h c o m p a n i e s t o be subsidised in their early years. Because Canada has a largely n o n - m i l i t a r y d o m e s t i c e c o n o m y it does not use this system of s u p p o r t as w i d e l y as c o u n t r i e s having large military or defense budgets. O n t h e o t h e r h a n d Canada must be c o m p e t i t i v e in h i g h - t e c h areas, and must t h e r e f o r e e m p l o y equivalent m e t h o d s of f u n d i n g w h i c h w i l l give t h e same d e g r e e of p r o t e c t i o n t o h i g h - t e c h industries. In o t h e r w o r d s Canadian c o m p a n i e s s h o u l d not be penalised by Canada's peace-like posture. Thus t h e p r o b l e m is h o w s h o u l d w e p r o v i d e this k i n d of industrial support? O n e possibility is t o use G o v e r n m e n t s u p p o r t e d h i g h - t e c h projects (of a peaceful kind) in a similar m o d e t o t h e " N a t i o n a l S e c u r i t y " contracts in o t h e r countries. Thus if DIST set u p a 'Large Scientific and Industrial Projects Program' t o manage these proposals a n d t h e resulting projects ( i n c l u d i n g capital and o p e r a t i n g budgets), it c o u l d stipulate that t h e contracts s h o u l d be o p e n in t h e first place t o Canadian companies. This w o u l d apply t o b o t h t h e initial phase and at t h e t i m e any contracts w e r e renewed. O n l y if Canadian c o m p a n i e s w e r e unable t o meet t h e h i g h - t e c h r e q u i r e m e n t s or t o d e v e l o p items o n a reasonable t i m e scale w o u l d these contracts be placed in o t h e r c o u n t r i e s . This e l e m e n t of p r o t e c t i o n is similar t o that used by o t h e r countries, in t h e i r National Security programs. Thus t h e Large Scientific and Industrial Program of DIST c o u l d be used t o offset t h e National Security scientific programs of o t h e r c o u n t r i e s especially t h e U.S.A. W e are sure that y o u fully appreciate t h e significance of this proposal in a l l o w i n g Canadian c o m p a n i e s t o c o m p e t e o n a fair and equitable basis in t h e f o r t h c o m i n g free trade era. M o r e o v e r t h e above proposal m i g h t be an i t e m w o r t h c o n s i d e r i n g at t h e f o r t h c o m i n g National C o n f e r e n c e o n T e c h n o l o g y & I n n o v a t i o n t o be h e l d in January 1988. T h e r e is a n o t h e r p r o b l e m w h i c h m i g h t be solved in part by this n e w program. O u r Association, a m o n g o t h e r organizations a n d d e p a r t m e n t s in Canada, has n o t i c e d w i t h dismay that d u r i n g t h e past 15 years o u r c o u n t r y has spent a smaller fraction of its resources o n major high t e c h scientific projects than spent by o t h e r industrialized countries. It seems that a mechanism is lacking in Canada for g a i n i n g f u n d i n g approval f r o m t h e various agencies of t h e Federal G o v e r n m e n t , o n t h e financial and t i m e scales in v o g u e in o t h e r W e s t e r n countries. W h i l e w e a p p l a u d t h e initiatives w h i c h have been taken in past years (e.g. Canada-France-Hawaii Telescope, Varennes Tokamak p r o j e c t , Space Agency etc) w e k n o w of many o t h e r g o o d projects p r o d u c e d by t h e w o r k a n d initiative of Canadians w h i c h are w o r t h s u p p o r t i n g . To keep pace w i t h t h e rest of t h e industrialised w o r l d in t h e i r c o m b i n e d n o n - m i l i t a r y a n d military scientific e x p e n d i t u r e , w e suggest that DIST set u p a m e c h a n i s m f o r approval and f u n d i n g of projects in this class w h i c h w o u l d be o u t s i d e t h e NSERC/NRC f u n d i n g scheme (i.e. that s c h e m e successfully e m p l o y e d f o r many years in t h e f u n d i n g of smaller scale projects). Such a p r o g r a m w o u l d enlarge t h e u n i v e r s i t y / i n d u s t r y interface and a l l o w a variety of n e w ideas at t h e f o r e f r o n t of science t o be p i c k e d u p a n d e x p l o i t e d by industry, because many of these projects arise t h r o u g h n e w d e v e l o p m e n t s in University research and involve extensive u n i v e r s i t y / i n d u s t r y c o l l a b o r a t i o n . Thus t h e y offer an ideal v e h i c l e f o r t h e f u r t h e r a n c e of t h e aims of DIST. The c u r r e n t delays in p r o j e c t approval u n d e r t h e existing system have led t o Canada a d o p t i n g a b a c k w a r d - l e a n i n g posture in many branches of science, a n d w e feel that f r o m b o t h t h e scientific a n d industrial points of v i e w this matter is an urgent o n e m e r i t i n g y o u r attention. W e have n o t e d that b o t h t h e N.R.C. and N.S.E.R.C. have r e c o g n i z e d this p r o b l e m and have w o r k i n g groups studying it. In a d d i t i o n t o t h e i r ideas however, p r o j e c t s in this category c o u l d be useful examples u n d e r t h e p r o g r a m p r o p o s e d in t h e s e c o n d paragraph. Thus t h e Large Scientific a n d Industrial Project Program m i g h t i n c l u d e a section d e v o t e d t o this field. W e w o u l d of course be p r e p a r e d t o discuss b o t h of these matters f u r t h e r w i t h a p p r o p r i a t e m e m b e r s of y o u r d e p a r t m e n t , if y o u feel that w o u l d be w o r t h w h i l e . Yours sincerely, P.A. Egelstaff, President, Canadian Association of Physicists. 82 Physics in Canada July 1988 Ministre de l'Expansion industrielle régionale jjffri^ ^ ^ ^ Minister of Regional Industrial Expansion CANADA L'honorable The Honourable Robert R. de Cotret Dr. P.A. Egelstaff President Canadian Association of Physicists 151 Slater Street, Suite 903 Ottawa, O n t a r i o K1P 5H3 Dear. Dr. Egelstaff: This is in reply to your letter of December 10, 1987, c o n c e r n i n g the development of the Canadian high-technology industry, and enclosing a background d o c u m e n t entitled Physics in Canada: A Brief Survey and Outlook. I have noted the Canadian Association of Physicists' proposals for a Large Scientific and Industrial Projects Program, w h i c h w o u l d e m p l o y government strategic p r o c u r e m e n t contracts to b u i l d Canadian high-technology capabilities, and for a new mechanism t o coordinate and expedite federal f u n d i n g approvals for major high-technology scientific projects w h i c h operate at the university/ industry interface. W i t h regard to the use of strategic purchases, the government advocates the use of federal purchases in a manner similar to your proposal, and has a n u m b e r of mechanisms in place to ensure the participation of Canada's high-technology companies. These mechanisms include Procurement Review Committees, full-time project management teams for projects valued at $100 m i l l i o n and above, as well as various contracting policies. These mechanisms are directed at purchases not covered by international agreements to ensure Canadian industry benefits and participates to the fullest extent possible. The benefits are generally referred to as industrial benefits and include technology transfers, investments, as well as Canadian content. The development and application of science and technology to economic renewal is a t o p priority of the government. As the attached record shows, the federal government has demonstrated leadership and c o m m i t m e n t to this objective, including such initiatives as the National Science and Technology Policy, a National Advisory Board on Science and Technology (chaired by the Prime Minister), a House of C o m m o n s Standing C o m m i t t e e on Research, Science and Technology, and the creation of the government's flagship e c o n o m i c department to ensure the effective integration of advanced science and technology and competitive industrial capacity. The new Department of Industry, Science and Technology (DIST) will stimulate, encourage, assist, improve and support the international competitiveness of Canadian industry; the development, diffusion and application of new technologies; and scientific research w i t h i n Canada. W o r k is n o w under way to create new policies, programs and services to p r o m o t e a more technologically sophisticated and internationally competitive industrial base and t o foster excellence in science. Your comments and suggestions are particularly timely and will be taken into consideration in developing strategies and new p r o g r a m m i n g for DIST. Thank you for w r i t i n g to me about these matters. Yours sincerely, Robert R. de Côtret Xa Physique au Canada juillet 1988 83 Atomic Energy of Canada Limited Applications of Accelerators J.H. Orm rod and /. Ungrin Accelerator Physics Branch Chalk River Nuclear Laboratories Chalk River, Ontario> Canada KOJ I JO 1988 May I INTRODUCTION Most physicists are aware of the role accelerators play in research. Many have used an accelerator either in the laboratory they w o r k in or at the university they came from and many are aware that the Superconducting Super Collider (SSC), w h e n it is built, may expose fundamentally new physical phenomena such as the constituents that make up quarks. What may not be so well known are the significant niches that accelerators now occupy in other fields such as medicine or industry and the opportunities for an even greater application of this technology in these fields. The accelerator characteristics required in medicine or industry often differ from those normally considered important for research accelerators. This article will discuss some of these differences and describe some non-research applications. Accelerators come in a variety of sizes with the size generally increasing with energy — for example the diameter of the SSC will be 83 kilometres. They also come in a variety of types. The simplest is a static voltage across one or more gaps — the energy acquired from such an accelerator is the product of the potential difference across the gaps and the charge on the particle. The energy f r o m such simple machines (rectifier generators and electrostatic generators in Fig. 1) is limited. To achieve higher energies, one must use a radiofrequency accelerator in which the particles are not accelerated in a continuous stream but in discrete bunches that receive a series of relatively modest impulses that can sum to the very high energies shown in the figure. It is essential in any radiofrequency accelerator for the bunches to arrive at the accelerating gaps at the correct phase for acceleration. The means used to achieve this synchronism depends on the particle. Electrons, having a small mass, are rapidly accelerated to near the velocity of light and the synchronism is maintained by making each accelerating cell (the distance between adjacent accelerating gaps) of equal length — say half a wavelength for an accelerator having adjacent cells 180 degrees of phase apart. Accelerated protons or heavy ions approach the velocity of light much more slowly than electrons and a variety of strategems are used to ensure that the particles reach the gap at the correct phase. In a linear accelerator, the cell length increases with the velocity of the ion, in an isochronous cyclotron, the combination of the average magnetic induction and the orbit radius are tailored to ensure that the time for each revolution is the same and in a synchrotron, where the path length is the same for each complete orbit, the frequency is changed to keep the rf in step with the accelerated bunches. All of these types of accelerators were developed initially for research and have f o u n d applications in medicine and industry. In the research environment, an important parameter is the 'quality' of the beam coming out of the accelerator. The quality is fully described by the volume in six-dimensional phasespace occupied by the beam, which, according to Liouville's theorem, is an invariant. Although there is some cross-talk between the phase-space dimensions, one can normally separate them into three two-dimensional packages, one along the beam direction that describes the energy spread and two in the transverse plane that are usually called the horizontal and vertical emittances. 84 Physics in Canada July 1988 The emittance is a measure of the transverse confusion in a beam. It is an area in transverse phase-space, normally elliptical, and is usually expressed as a product of the size and divergence of the beam with units of pi-mm-mrad. It determines how small a spot one can focus the beam down to and is often the limitation on the resolution one can achieve in a given experiment. It is not surprising then that in some research applications there is great incentive to have a very small emittance even to the point of introducing ingenious devices like coolers that can shrink the volume in phase space. (In beam-beam cooling, the transverse momentum of the particles in the beam is transferred, via collisions, to particles in an auxiliary beam. Liouville's theorem is not violated because it must be applied to the complete interacting system, cooled beam plus cooling beam.) The reduced emittance achieved with coolers is essential in attaining acceptable luminosities for the operation of colliding beam facilities. The longitudinal phase space describes the energy spread in the beam. A small energy spread can be important in experiments involving details of nuclear structure such as 1000 T e V ELECTRON STORAGE RINGS (EQUIVALENT ENERGY) PROTON STORAGE INGS lEOUIV E) 1 TeV PROTON SYNCHROTRONS ELECTRON LINACS ELECTRON SYNCHROTRONS SYNCHROCYCLOTRONS 1 GeV PROTON LINACS BETATRONS SECTOR-FOCUSED CYCLOTRONS ELECTROSTATIC GENERATORS RECTIFIER GENERATORS 1 MeV 1930 1 9 4 0 1950 1960 1970 1980 YEAR Fig. 1. Livingston Chart that shows how the maximum energy from accelerators has increased a decade every six years for the past 50 years. intrinsic level widths or the study of reactions where several overlapping channels may exist. The application of electrostatic accelerators to carbon dating imposes stringent requirements on energy stability. The energy of research accelerators has increased dramatically over the past decades (see Fig. 1) and as higher energy beams have been attained a greater understanding of the nature of matter has been achieved. The higher the energy the smaller the dimension that can be studied — Nobel laureate Abdus Salam has recommended that accelerator builders should not ask theorists how high the energy of the next accelerator should be but to aim for the highest energy possible. TeV (Tera or million million electron-volt) collisions have been achieved at Fermilab and the superconducting super collider is being built to provide 20 TeV on 20 TeV collisions. In industrial applications, exceptionally high energies, good emittance and small energy spread are, for the most part, unimportant. Important features are more likely to be simplicity (the accelerator is probably not going to have the highly skilled technical staff found in a research environment to nurse it), safety (industrial machines tend to be much closer to the general public), ruggedness (an oil well is a hostile environment compared to the relatively antiseptic atmosphere of a research laboratory), reliability (the volume of product pileup in a high throughput medical disposable sterilization facility can be staggering if the irradiator is not working), high average beam power (the economics of some applications demands a high throughput), efficiency (the economics of some applications depends on how successfully mains power is converted to beam power), and cost (the investment is expected to yield an economic return). As with research machines, the important characteristics depend on the application, but there are different priorities. II APPLICATIONS a) Medical therapy: modality is still in clinical trials. Both electrons and protons are characterized as low LET (Linear Energy Transfer) radiation. Neutrons have a high LET. The centres of tumours are often anoxic and high LET radiation is more effective in destroying cancer cells than low LET radiation in the absence of oxygen. Thus the ratio of tumour destruction to healthy cell destruction is about 60% better for neutrons than for photons. One factor that has hindered the greater use of neutron therapy is the lack of a suitable source. Accelerators that produce 14 MeV neutrons from the T(d,n) 4 He reaction, either from sealed tubes or from bombarding solid tritiated targets with deuterons have inadequate source strength and are not widely accepted because treatment times are too long. Adequate fluxes are available from cyclotrons accelerating protons or deuterons to 20-70 MeV onto beryllium or lithium targets ['Be(p,nr>B, 'Be(d,n) 1 °B, ?Li(p,nFBe, or 'Li(d,n)<>Be] but these facilities suffer from the disadvantage of a fixed beam direction. This deficiency has been overcome in some cases by an elaborate beam transport system with the final transport elements in a special gantry to permit multi-port irradiations. Recently, a small superconducting cyclotron has been built to accelerate deuterons to 50 MeV for a neutron source. (1) It has been fitted into a gantry capable of 360 degree rotation and will soon be installed in a hospital for clinical trials. Protons and heavy ions, like neutrons, provide high LET and have the additional advantage of the Bragg peak. This increase in stopping power at the end of the range provides a depth dose distribution much more favourable for therapy because the damage can be concentrated at the t u m o u r location, unlike the modalities described above that normally give decreasing damage with increasing penetration. The well defined range can also be an advantage for treatments where it is important that there be minimal interaction with nearby sensitive organs, such as in the treatment of pituitary tumours or tumours adjacent to the optic nerve. To provide adequate penetration of the human body by protons, 250 MeV accelerators are required. Only modest Most accelerators used in medicine are involved in the direct treatment of patients and the majority of these are electron accelerators. Over 2000 medical linear accelerators are in use worldwide, and for some years sales of accelerators for cancer therapy have exceeded sales of cobalt therapy units. Figure 2 shows depth-dose curves (the attenuation of dose as a function of the penetration in the patient or water phantom) for a cobalt irradiator and photons from electron beams of several energies. The attenuation of the 4 MeV accelerator photons is similar to that of 60 Co gamma rays but the harder photons f r o m the higher energy beams have, as expected, greater penetrating power and are the preferred modality for deeper seated tumors. The beam from an electron accelerator can also be used directly, without converting the beam energy to photons in a heavy metal target, to treat more easily accessible cancers. Although betatrons were c o m m o n in the early days of 'Megavolt therapy', in the past two decades they have been supplanted by s-band (3GHz) linear accelerators. In most cases, the accelerator and its ancillaries are fitted into a rotating gantry that permits the beam to be directed at the treatment couch at almost any angle. This allows irradiation of the t u m o u r t h r o u g h several "ports", thus reducing the damage to the healthy cells between the skin and the tumour. Most accelerators deliver electrons at a single energy between 4 and 40 MeV but some offer several choices. Fast neutrons have been used in radiotherapy since the late 1930's but, for a variety of reasons, have not achieved the degree of acceptance enjoyed by high energy electrons. Although fast neutrons have been shown to be superior in the treatment of some cancers, the greatest use of this 0 E P T H IN W A T E R (cm) Fig. 2. Depth-dose curves for 60 Co, fast neutrons and photons from 4 and 25 MeV electrons. Xa Physique au Canada juillet 1988 85 currents are needed, of the order of 10 nA, and a synchrotron is probably the most economical realization. Even so, such a synchrotron is of the order of 10m diameter' 2 ' and the facility is m u c h more costly than for other modalities. To date, all p r o t o n treatments have been performed at nuclear physics facilities but the success of these treatments has precipitated proposals for dedicated facilities. Heavier ions have an even greater LET than protons so a higher energy beam is required to achieve adequate penetration — for example, 4 GeV for nitrogen. Again, patients have been treated at physics research facilities. Pions have also been used for radiotherapy. At the end of its range, a pion is captured by a nucleus w h i c h then disintegrates. Most of the energy from the reaction is deposited close to the point of disintegration. O n e might have expected that pions w o u l d be the ideal particle for radiotherapy, especially for regionally localized cancers, and clinical trials were initiated shortly after commissioning at all three of the meson factories — TRIUMF in Vancouver, SIN in Villigen, Switzerland and LAMPF in New Mexico. Because of l o w meson fluxes, treatment times are about an order of magnitude longer than for p h o t o n therapy, requiring lengthy i m m o b i l i z a t i o n of the patient. For some cancers, pion therapy has been successful but not overly impressive and clinical trials have been terminated at LAMPF. Thus, pions have not emerged as clearly superior particles for radiation therapy and they remain an experimental modality; p r o t o n therapy may well become the treatment of choice for localized cancers. b) Medical Isotope Production Radioisotopes, usually p h o t o n or positron emitting, are used in medicine for a w i d e variety of diagnostic tests including t u m o u r localization, the study of organ functions and measurements of b l o o d flow. Many of these isotopes are p r o d u c e d at nuclear reactors either as fission products or by neutron capture but almost all the neutron deficient species are accelerator generated. A l t h o u g h a 45 MeV linear accelerator was built specifically for the p r o d u c t i o n of radiopharmaceuticals' 3 ', for a variety of reasons it was never fully commissioned and cyclotrons c o n t i n u e t o be the accelerator of choice for the p r o d u c t i o n of radioisotopes for medicine. Research cyclotrons in some nuclear physics laboratories are used part-time for this w h i l e others are operated commercially, exclusively for v o l u m e p r o d u c t i o n of such isotopes. Short-lived isotopes are comm o n l y p r o d u c e d by small cyclotrons located in the hospital. Shorter half-lives reduce patient dose- for example, the use of 123 l [T-13 hours] instead of 131 l [T-8 days] reduces the patient dose almost t w o orders of magnitude. Typical beams for isotope p r o d u c t i o n are protons, deuterons or alphas w i t h energies up to tens of MeV. Beam powers of kilowatts t e n d to be greater than most nuclear physics requirements. Accelerator reliability is important to ensure the availability of short half-life radioisotopes. Unscheduled d o w n time is often only 1-2% (4 ', and a nearby facility is often contracted as a backup to ensure regular deliveries. c) Sterilization Electron accelerators have gained w i d e acceptance in industry for the sterilization of a considerable range of products. The largest application by far is the sterilization of disposible medical supplies such as hypodermic syringes, needles, catheters and sterile dressings. It is estimated that some 500 k W of electron beam capacity is installed w o r l d w i d e for this application' 5 '. In addition, electron beams are being used t o sterilize antibiotics and other pharmaceuticals and to sterilize b o n e marrow or human organs for immediate transplanting 86 Physics in Canada July 1988 or for long term storage. Containers for fruit juice and coffee creamers and a n u m b e r of cosmetic or personal hygiene products are also being sterilized w i t h electron beams. Electron accelerators for sterilization range in energy f r o m 0.5 MeV to 15 MeV w i t h average beam powers from 150 k W at the lower portion of the range to 10 k W at the higher energies. D.C. accelerators are normally used for sterilization below about 4.5 MeV while radiofrequency linacs are preferred for the higher energy applications. The radiation dose needed t o meet the degree of sterilization demanded varies from country t o country but is typically 25 kGy (2.5 Mrad). Electron accelerators are used t o provide either the full dose or to provide an add-on dose to i m p o r t e d materials that have been treated to lower dosages in the exporting country. Product t o be sterilized is usually presented to the accelerator beam on a conveyor belt system. The low penetration of electrons in the several MeV range means that individual items are irradiated while above 10 MeV it is often possible to treat complete cartons of product. Cartons usually receive doublesided irradiations by passing t h e m t h r o u g h the same beam a second time after rotation outside the shielded irradiation cell. Typically, packaged disposable medical products have a relative density of 0.15-0.20 W i t h a 10 MeV electron beam and d o u b l e sided irradiations an acceptably u n i f o r m dose distribution can be attained to a thickness equivalent of about 8 grams per cubic centimetre corresponding to carton thicknesses up to 40 cm. In the bremsstrahlung mode w h e r e the electron beam energy is converted to photons by allowing it t o impinge o n a thick, heavy element target such as tungsten, even thicker packages can be treated w i t h an acceptable uniformity of dose. This latter mode of operation is usually only considered w i t h high power accelerator at the higher limits of the energy range since low conversion efficiency f r o m electron t o p h o t o n energy makes the use of sterilization w i t h isotopic sources such as 60 Co more economical. The very high dose rates that can be achieved w i t h electron beams lead to the use of accelerators instead of isotopes for irradiating some products even t h o u g h the cost per unit dose may be slightly higher. Materials such as polypropylene are f o u n d to degrade due to the actions of various radicals d u r i n g a long irradiation period but show no significant degradation w h e n receiving the same total dose at the m u c h higher dose rates achievable w i t h electron beams. Radiation is in c o m p e t i t i o n w i t h a number of different physical and chemical processes for the medical products sterilization market. A key advantage that both electron and p h o t o n irradiation hold over other methods is that the products can be sterilized after packaging thereby avoiding potential recontamination. Two additional advantages are 1) the absence of residuals (traces of chemicals) from the process thereby decreasing the h o l d - u p time between sterilization and usage and 2) the elimination of high temperatures w h i c h can degrade many plastics, thereby precluding their use. d) Food, Animal Feed and Water O n e of the potentially most valuable applications of accelerators is for the sterilization, extension of shelf life or preservation of human and animal foods and for the sterilization of water. Many field trials have taken place over the past 20 years using radiation f r o m accelerators or isotopes and although the processes have been well established and accepted by a w i d e array of government and international bodies, a large segment of the public remains skeptical about safety. The use of accelerators in the treatment of f o o d is governed by the recommendations of the Codex Alimentarius Commission of the United Nations. The Codex is the result of an exhaustive international study aimed at determining the radiation dose and irradiator energy that will induce negligible radioactivity in f o o d (compared to the natural activity) w h i l e maintaining its wholesomeness. Food can be treated w i t h an electron accelerator either in the elecron or in the p h o t o n mode. The Codex recommends that in the electron m o d e the maximum beam energy be 10 MeV w h i l e in the p h o t o n mode the maximum photon, and therefore the m a x i m u m electron, energy be 5 MeV. The m a x i m u m p e r m i t t e d dose for f o o d products is countryd e p e n d e n t but typically ranges from 0.1 kCy for inhibiting sprouting in onions and potatoes to 10 kGy for disinfecting spices. The first large scale f o o d irradiation trials w i t h an accelerator were carried out by the U.S. Army at its Food Engineering Laboratory at Natick, MA. between 1971 and 1974.<6> A 10 MeV, 6 k W electron linac was used to irradiate 51 000 kg of beef then an exhaustive series of test panel and animal feeding trials were carried out w i t h this irradiated material. Since this initial trial numerous smaller scale tests have taken place. T w o p r o d u c t i o n scale, accelerator-based f o o d irradiation facilities are presently in operation in the world. O n e is in Brittany, France where mechanically d e b o n e d chicken is being treated w i t h an 8 MeV electron linac, the other is at the Russian port of Odessa where i n c o m i n g grain is disinfected w i t h t w o 1.4 MeV 20 k W accelerators. The incentive for animal feed irradiation is two-fold. The first is t o p r o d u c e healthier animals and to destroy contaminants such as salmonella w h i c h is prevalent in poultry. The second is to allow the recycling of once-digested food. No industrial scale accelerator based irradiators are yet in existence for these applications. C h l o r i n a t i o n of d r i n k i n g water has been widely accepted as a safe and e c o n o m i c process. Concern has surfaced over the last decade over the reaction of chlorine w i t h the residues of chemicals used in agriculture (fertilizers, pesticides, fungicides etc.) and industry. These reactions can produce noxious c o m p o u n d s such as halogenated hydrocarbons w h i c h have toxicities comparable to or greater than those for w h i c h the chlorination was originally applied.' 7 ' This is a potentially very large field of application for electron accelerators — they can replace chlorination, thereby eliminating the process that forms the noxious compounds, and at the same time destroy the original toxic chemicals. For a small city w i t h a population of 100,000, 3 to 4 M W of beam power w o u l d be required to irradiate all of its water needs to a dose of 10 kGy. Water is an ideal m e d i u m for treatment w i t h accelerators since it is uniform in density and a flow system can easily be designed to the w i d t h and thickness most appropriate to a given accelerator beam. e) Production and Treatment of Synthetic Materials The most widely used industrial application of accelerators is in the p r o d u c t i o n and modification of man made materials. In excess of 450 electron accelerators are used to generate the estimated 30 M W of beam presently used in the prod u c t i o n of raw bulk materials or in inducing cross-linking, c u r i n g or drying of materials in the final p r o d u c t manufact u r i n g stages' 5 '. The largest industrial application of electron accelerators is in the wire and cable industry and in the p r o d u c t i o n of heat shrink t u b i n g . Radiation cross-linked polyvinyl chloride, w h i c h has excellent electrical insulating properties and a high resistance t o organic solvents and heat, can be used in thinner layers than other materials for the same voltage hold-off and has gained w i d e acceptance in the wire and cable industry. Radiation cross-linked polyethylene remains functional at a significantly higher temperature and has a higher dielectric strength than its non-cross-linked counterpart and has similarly gained w i d e acceptance in the wire industry. Cross- linked polyethylene is the most popular of several materials that have an additional valuable property, namely, an elastic memory. In the electrical industry, this property is used to manufacture heat-shrink t u b i n g by expanding the irradiated t u b i n g d u r i n g manufacture. It will then shrink to its original size if it is heated and allowed to cool. The energy of the accelerators used in the wire and cable industry depends on the thickness of dielectric being treated. For the bulk of the applications m e d i u m voltage (400-3000 keV) accelerators of many types are being used w i t h over 150 accelerators presently installed. Lower voltage accelerators are used in a few applications while higher voltage units are used in the manufacture of high voltage cables where higher energies are needed to penetrate the thicker dielectric. The materials to be irradiated are normally processed in electron mode by multiple passage on a complicated spooling system that assures equal dosage to the entire circumference. The elastic memory of cross-linked polymers is widely used in the packaging industry where thin heat shrink film is p r o d u c e d in enormous quantities and irradiated. Approximately 100, mainly low voltage, accelerators are used in this application. The energy is normally tailored to the film thickness but has a lower practical limit of about 150 keV due to losses in the vacuum-air w i n d o w at the exit of the accelerator. Typical shrink film treatment accelerators operate at 200 keV w i t h beam powers of 50-100 kW. The electron beams are either scanned across a 1-2 m wide product w i d t h or more usually are generated as a curtain beam from a line filament. Another well established application of low voltage electron accelerators is in the curing and drying of polymer-based coatings, adhesives and binders on an increasing range of products. Electron beams have several advantages over conventional curing and drying processes including speed, lack of need for solvents, improved chemical and thermal properties and c o n t r o l of the d e p t h of cure. Products treated include paint on automobile dashboards and doors, magnetic discs and tapes, high gloss labels for beer bottles, varnishes on w o o d panels, pressure and heat sensitive tapes and plywood. Product handling becomes an art in itself for some of these applications w i t h treatment speeds up to 100 m / m i n . Estimates of the number of accelerators installed for these applications range from 100 to 400. The automobile tire industry has used m e d i u m energy elect r o n accelerators for some time to induce partial vulcanization of the various polymer layers used in the manufacture of tires. The rapid curing available w i t h electron beam treatment permits a more uniform distribution of the layers and at the same time improves the cohesion strength. An estimated 30 accelerators are now in use for this application. Some less well-established applications of accelerators in the polymer industry include the treatment of fabrics to improve resistance to wrinkling, shrinkage or fire, the treatment of thick walled t u b i n g and pipe to improve mechanical properties, c u r i n g of epoxies and the p r o d u c t i o n of cross-linked polyolefin foams. A relatively recent application is for the degradation of Teflon waste. The finely p o w d e r e d irradiated waste p r o d u c t is used as an additive to lubricants. The use of accelerators in the p r o d u c t i o n of feed materials for the plastics industry has been under study for a n u m b e r of years. Electron beams can initiate chemical reactions w i t h a m i n i m u m of excess heat, thus offering the possibility of very energy efficient p r o d u c t i o n processes. Electron beams can be environmentally attractive as compared w i t h the use of volatile chemical solvents. Another attractive feature of electron beam treatment is the deep penetration of the beams so that the required energy can be deposited at the desired depth in the product. Few of these applications have yet Xa Physique au Canada juillet 1988 87 reached large scale industrial implementation but the dev e l o p m e n t of higher energy accelerators w i t h beam powers of several h u n d r e d k W is expected to provide the impetus required. also been used to examine nuclear reactor fuel elements and t o l o o k f o r inclusions of high neutron absorption cross-section elements such as b o r o n in zirconium, a l u m i n u m and uranium. Image resolutions d o w n to 0.1 m m can be achieved w i t h this technique. f) Radiography Neutrons for radiography are p r o d u c e d w i t h ion accelerators using the same family of reactions as those previously listed for medical therapy. Typical beam currents of several h u n d r e d microamps are used at beam energies up to 20 MeV. Radiography was one of the earliest fields of application for accelerators, w i t h the simplest f o r m of "accelerator" being a l o w voltage X-ray tube. Numerous radiographic techniques have been developed in the last forty years using either primary beams (protons) or secondary beams (MeV X-rays or neutrons) f r o m a w i d e range of accelerators. X-ray radiography continues t o be the most widely used accelerator-based mode, w i t h estimates of more than 200 units installed in industrial applications.* 8 ' Resonant transformer and Van de Graaff accelerators are used to generate electron energies up t o about 4 MeV w h i c h generate X-rays sufficient t o investigate m e d i u m density materials up to 200 m m in thickness. Compact linacs and betatrons w i t h energies up to 35 MeV are used for the radiography of thicker objects. Since many of the objects t o be examined are bulky and heavy, almost all X-ray radiography accelerators are m o u n t e d o n a m o b i l e gantry or hoist that can be moved about the object. An example of the extreme size of objects examined by X-ray techniques is the use of a 16 MeV linac t o radiograph in detail 8 m long fully assembled rocket motors having diameters of up to 2 m. A defect as small as a 0.08 m m crack is expected to be detected in this facility.' 1 0 ' The quality of the X-ray radiographs obtained depends on the energy, power, and spot size of the beam, o n the thickness and type of material used and on the time of the exposure. A linac w i t h an energy of 8 MeV and an average power of several h u n d r e d watts can p r o d u c e a useful image of flaws in a square metre of 400 m m thick steel plates in about one hour. Flaw sizes typically 0.2-0.5% of the sample thickness can be located. Neutrons (usually at thermal energies) are used in radiography either in stand alone applications or in c o m b i n a t i o n w i t h X-rays. The neutron absorption cross-section is dependent o n nuclear structure in contrast to X-ray absorption w h i c h essentially depends o n the number of atomic electrons (see Fig. 3) so that many features that go undetected w i t h X-rays are observed w i t h high contrast using neutrons. In particular, the very high neutron absorption cross-section of hydrogen is used t o g o o d advantage in radiography to detect hydrogenous materials such as explosives. N e u t r o n radiography has 0 10 20 30 40 50 60 70 80 90 100 ATOMIC NUMBER Z Fig. 3. The variation of neutron and X-ray absorption coefficients with atomic number of the element. 88 Physics in Canada July 1988 Proton radiography has not received the acceptance that X-ray or neutron radiography has in industry. The comparatively low penetration of protons and the complexity and high cost of the accelerators required to produce usable beams at energies of 100-200 MeV preclude the rapid acceptance of this t e c h n i q u e in industry. Applications to date have usually employed large laboratory-based accelerators. Since the scattering cross-section has an elemental dependence certain features not seen by other techniques are more easily recognized w i t h protons. Experiments to date show that, at an energy of 160 MeV, steel plate thickness up t o 75 m m can be examined w i t h a resolution 1-2%'9>. It is not expected that p r o t o n radiography will see significant usage in industry until substantial cost and size reductions of accelerators needed to produce beams of this order of energy are achieved. g) Bore Hole Logging A number of ultra-compact, accelerator based radiation sources have been developed by the mineral and petroleum industries for bore hole logging. The most advanced and best k n o w n of these sources are the pulsed, fast n e u t r o n sources based on compact, low voltage (100-200 keV) ion accelerators that p r o d u c e 14 MeV neutrons by the T(d,n)*He reaction. The accelerator, typically a 4-7 cm diameter sealed glass or ceramic tube, houses under vacuum a reservoir or getter loaded w i t h a 50%-50% deuterium-tritium gas mixture, a Penning discharge ion source and a target impregnated w i t h deuterium and tritium. A filament heater in the reservoir liberates the gas mixture in a controlled manner. The gas is ionized by an arc in the ion source to produce a mixed beam w h i c h is then accelerated to the target by a high voltage pulse. Neutron source strengths of up t o 10 9 /s are obtained w i t h these accelerators. Typical lifetimes for the sealed t u b e units, w h i c h must operate at external pressures up to 1500 atmospheres and temperatures up t o 180 degree C, are 100-300 h. Gamma ray counters, usually Nal or Ge, are lowered w i t h the neutron sources in the bore hole and are used to determine the required geological information from the thermal capture gamma rays or the fission gamma rays that are p r o d u c e d for several ms after the short neutron pulse. Compact hard X-ray sources, based on high frequency rf electron linacs, have been developed for well-logging. These linacs, w i t h energies up to 4 MeV, are lowered d o w n the bore hole and produce intense bursts of mainly forward peaked X-rays from a heavy metal target m o u n t e d off axis near the bore hole wall. Variations in the density of the geological m e d i u m surrounding the bore hole are determined by observing changes in the energy deposited in detectors in the bore hole positioned to m o n i t o r the scattered radiation. In field trials' 1 1 ' at depths d o w n to 1000 m density variations of 0.5-1.0% were observable at scan rates up to 1200 m/h. An rf linac is clearly a m u c h more complex device than a sealed tube neutron generator and as such cannot be as easily packaged to fit into a narrow bore hole. Nevertheless, the tests reported above were achieved in a bore hole diameter of only 20 cm. . . a remarkable achievement. h) Gemstone Colour Changes Some gemstones occur in a variety of colours w i t h the rarer colours usually more valuable than their more c o m m o n counterparts. It is possible to induce c o l o u r centres artificially in some of the more c o m m o n stones and thereby increase their value.' 1 2 ' O n e example is topaz, an a l u m i n u m fluorosilicate, that occurs most c o m m o n l y as a clear stone w h i l e the most valuable colour is pink, f o l l o w e d by various shades of blue. Irradiation to several tens of MGy (several thousands of megaRads!) w i t h neutrons, gammas or electrons produces blue c o l o u r centres that are as stable as the colours that occur naturally — that is, a temperature of 600 degrees Celsius is needed to anneal out either the natural or the induced colour centres. Irradiation in a reactor w i t h fast neutrons produces a darker shade of blue than irradiation w i t h electrons but has the disadvantage of activating some of the impurities; the stones must then be stored for the order of a year to permit the activity to decay to an acceptable level. Electron irradiation also creates some activity but it is all f r o m 19 F(gamma,n) 18 F that has a half-life of 110 minutes, so it decays to a negligible level in a day. Electron energies in excess of 10 MeV are required to ensure that most of the current passes t h r o u g h the gems t o avoid charge accumulation and subsequent Lichtenberg figures that render the gems valueless. Typically, energies f r o m 13 to 20 MeV are used at beam powers of the order of 10 k W to be economic. Of the order of a million carats per year are processed. i) Micropore Filters M i c r o p o r e filters, membranes w i t h circular holes of precise size, d o w n to diameters smaller than 100 Angstroms or as large as several h u n d r e d microns, have a variety of applications. The major use is in the cleaning of water used for washing integrated circuits where minuscule contaminants c o u l d interfere w i t h the fine current paths. They are also used in medical diagnosis t o isolate cancer cells in the b l o o d or measure b l o o d cell deformability. Healthy b l o o d cells are deformable and can be squeezed t h r o u g h small apertures whereas some diseased cells are too rigid to pass through. A n o t h e r application is t o make contact lenses porous so that they can admit oxygen to the eye, thus p e r m i t t i n g longer periods of wear. Non-reflecting glass can be made by creating cylindrical holes, one-half wavelength deep, o n the surface. The membranes may be used as masks to generate complementary shapes such as metallic surfaces covered by thin, cylindrical, upright rods that act as excellent emitters in a strong electric field.' 1 3 ' The filters are manufactured by b o m b a r d i n g a membrane w i t h energetic heavy ions, then etching it in a caustic solution. The heavy ion trajectory is characterized by damage for some distance f r o m the ion's path, the radius d e p e n d i n g o n the mass and energy of the ion. The etchant dissolves the damaged material at a rate approximately a h u n d r e d times faster than the normal material, thus p r o d u c i n g cylindrical holes of preselected diameter. (See Fig. 4) a residual activity and the holes have a range of diameters. The filters p r o d u c e d f r o m accelerated heavy-ion beams are markedly superior and commercial suppliers are switching to accelerator-processed membranes. j) Material Modification The use of accelerators in the semiconductor industry is well established. Low energy dc accelerators have been used for the past t w o decades to implant boron, phosphorus or arsenic in silicon wafers used for semiconducting devices. M o r e recently, MeV implanters have been developed and are being used to fabricate unique semiconductor devices made possible by the greater range of the higher energy particles. M e d i u m energy oxygen beams have been used to establish insulated layers in silicon wafers giving better isolation to integrated circuits. The fluence required in this application demands high currents. For example, 2 * 10 1 8 /cm 2 of several h u n d r e d keV oxygen atoms are required to create the insulating layer in silicon-on-insulator devices, and beams of the order of 100 mA are needed t o achieve acceptable t h r o u g h p u t . These beam power levels require special equipment to handle the c o o l i n g of the wafers and place severe demands on ion source technology, not only to deliver the current but also to ensure adequate lifetimes. The more c o m m o n d o p i n g implanters are less demanding, and currents are usually less than 10 mA. The accelerators are invariably electrostatic even for the MeV implanters although Radio Frequency Q u a d r u p o l e (RFQ) accelerators are being considered. The commercial sales of implantation e q u i p m e n t have g r o w n rapidly and exceeded $300M in 1983.' 14 ' Low energy ion beams have also been used to modify the structure, c o m p o s i t i o n and surface topography of metals, ceramics and polymers p r o d u c i n g desirable changes in mechanical, chemical, electrical and optical properties. For example, nitrogen and c h r o m i u m have been implanted in steel to improve wear and corrosion properties. Taps, dies, nozzles for injecting plastics, crankshafts, helicopter rotor ball-bearings, bread-knives and artificial hip joints are a sample of the items for w h i c h this process has proved cost effective, w i t h lifetimes improved an order of magnitude and more. The economics of the process are especially beneficial w h e n the treated item is buried inside e q u i p m e n t and the labour c o m p o n e n t in its replacement constitutes a major cost. The required fluence of implanted atoms is about 10 1 7 /cm 2 , therefore high current implanters capable of delivering beams Heavy ions, such as krypton or xenon, at energies of several or several tens of MeV per nucléon generated by heavy ion accelerators such as the UNILAC or GANIL have been used to create the damage tracks. The current requirements dep e n d o n the density of holes required; this varies f r o m a single aperture, in applications that involve c o u n t i n g the particles passing t h r o u g h the hole, up t o 109 holes/cm 2 for filters. In the cases where a high surface density of holes are required it is important to have the holes at a variety of angles to reduce the probability of t w o parallel holes overlapping, thus p r o d u c i n g an aperture w i t h a greater crosssection than the others. This is readily achieved by presenting the m e m b r a n e t o the beam on a roller, the radius of w h i c h is chosen to give penetration angles up to 30 degrees. The damage tracks can also be p r o d u c e d if the energetic ions are fission fragments, but then the membranes acquire Fig. 4. Micropore filter of 5 micron diameter holes. (Photograph courtesy of Dr. C. Bieth, Cliche GANIL/CIRIL) Xa Physique au Canada juillet 1988 89 up t o 200 keV are needed. O b l i q u e incidence of the ion beam can be self defeating because of sputtering, and the mechanisms for presenting spherical or cylindrical products t o the beam can be quite elaborate t o ensure that beam does not strike the implanted surface at angles greater than 40 degrees. This application is relatively new and only a few accelerators have been sold to industry for treating tooling, but the demand is expected to g r o w rapidly. k) Long Wavelength Radiation Generation A rapid increase has taken place over the last decade in the use of electron accelerators t o p r o d u c e intense sources of long wavelength radiation. Both incoherent (synchrotron radiation) and coherent (free electron laser) sources have been built at many laboratories and are being adapted t o a w i d e range of practical applications. Several synchrotron facilities have been built specifically for this purpose using large, high energy (GeV range) electron synchrotrons.' 1 5 ' Useful sources n o w exist w i t h p h o t o n energies into the keV region. A new generation of compact " t a b l e - t o p " synchrotron radiation sources based o n superconducting magnet technology is now under active development. Free electron lasers (FEL) were first developed in the late 1970s. In a FEL, coherent radiation is extracted f r o m an electron beam by the action of a spatially-periodic magnetic field o n the beam, usually w i t h i n an optical cavity. (See Fig. 5) The wavelength of the radiation is d e t e r m i n e d by the energy of the electron beam and by the period of the magnetic field in the undulator or " w i g g l e r " . The laser is therefore tunable and f u r t h e r m o r e , the cavity can act as either an oscillator or as an amplifier. M o r e than fifty FEL sources' 1 6 ' over a wide range of wavelength are either in operation or under development around the w o r l d . The rapid g r o w t h in the number of sources has been closely tied to the development of high field permanent magnet materials for use in compact wigglers. Since the FEL p h o t o n wavelength is closely related t o the electron beam energy, the type of accelerator used depends o n the wavelength and o n the source intensity required. Accelerators presently used range f r o m pulse line diodes and induction linacs w i t h energies up to several MeV, w h i c h are used for long wavelength applications (0.1-10 mm), t o high energy linacs and storage rings in the 50-200 MeV range w h i c h are needed for FELs designed t o operate in the sub micron wavelength range. Existing and potential uses of long wavelength radiation include tomography, microcircuit manufacture, medicine (surgery, therapy of tumors and pharmaceutical production), radar, chemical p r o d u c t i o n and isotope separation. Free electron lasers are capable of very high peak powers and levels > 1 0 0 M W have already been achieved. The maximum average p h o t o n beam powers achieved, however, are still relatively small (several h u n d r e d watts). The g r o w i n g n u m b e r OUTPUT RADIATION ^ INJECTED E - BEAM H WIGGLER MAGNETS —-—-I E _ BEAM —INTERACTION LENGTH Fig. 5. A typical electron beam wiggler interaction geometry. The output radiation wavelength is proportional to the interaction period and inversely proportional to the square of the energy. 90 Physics in Canada July 1988 of industrial and potential military applications will u n d o u b t edly stimulate the development of much higher average power FELs over the next decade. I) Sewage Treatment Accelerators, as potent sources of high dose rate radiation, have been considered for the disinfection of sewage for many years.' 17 ' A number of accelerator based pilot plants have been operated in several countries over the past t w o decades. Most have been based on relatively l o w power (15-30 kW) dc accelerators w i t h energies of a few MeV and have treated sewage w i t h high water content (>80%) in the electron mode. The results of the field trials have generally been very g o o d w i t h disinfection levels being achieved at dosages of 4-10 KGy, orders of magnitude better than achieved by conventional methods. O n the basis of these trials a number of treatment plants have been proposed based o n linacs w i t h average powers in the 200-500 k W range. The major barrier to large scale implementation of accelerators in sewage treatment has been economic. At present, many industries and cities are able t o dispose of their sewage w i t h only minimal treatment. Standard treatment methods w h i c h achieve lower levels of disinfection and are cheaper, therefore continue to be acceptable. This situation is expected to c o n t i n u e unless changes occur in the environmental regulations of many countries or unless valuable use can be made of the treated product. Recent studies in Japan w i t h an accelerator based treatment plant show that composting of the sewage occurs quicker w i t h irradiated sewage' 18 ' and that valuable waste storage land is tied up for shorter periods. In addition, the higher disinfection levels achieved w i t h radiation can allow a more rapid recycling of this treated material as a fertilizer or, in some cases, even as animal feed. In many countries, however, the metal contamination in sewage by effluents from industrial processes is so high that the disinfected and composted material has little economic value except as land fill. m) Stack Gas Cleaning A potential application for accelerators is the p r o d u c t i o n of modest energy (100-1000 keV) electron beams for use in a dry scrubbing process to remove both sulphur and nitrogen oxides ("SOX and NOX") f r o m coal fired power plant flue gases. In this process, electron beams are used to ionize and excite atoms and molecules in the stack gas leading to the formation of a wide range of radicals, ions and excited molecules w h i c h react w i t h each other, w i t h water vapour or w i t h injected chemicals to form precipitates w h i c h can be readily removed from the gas. In the Ebara process, the injected dry chemical is ammonia and the resultant precipitates are a m m o n i u m sulphate and a m m o n i u m nitrate w h i c h have commercial value as fertilizers or general soil conditioners' 1 9 '. The chemistry of the Ebara process is rather complex and is the subject of an on-going scientific controversy. Prototype field trials have, however, been held in Japan, Germany, and in the U.S.A. and show very promising results w i t h more than 90% of both SOX and NOX removed f r o m the stack gases. High power, w i d e beam, dc electron accelerators are needed for the stack gas applications. Since the m e d i u m is of very low density only modest beam energies are required. Typically 200-300 keV accelerators that p r o d u c e 1.5-3.0 m w i d e " c u r t a i n " electron beams up to 1 A in intensity are being used in prototype scrubbers. Full scale scrubbers will require many accelerators w o r k i n g in parallel. Both windowless accelerators w h i c h use differential p u m p i n g techniques to maintain a good vacuum in the accelerator volume and t h i n w i n d o w units are being developed. The hostile environment and the high Fig. 6. The RFQ accelerator being built at CRIML'24'. Protons are accelerated along the axis of the 238 mm diameter tank in the centre of the aperture defined by the four vanes. The vane tips are modulated to establish electric fields that focus and accelerate the beam. reliability required for these high power (200-1000 kW) accelerators will severely test the ingenuity of their designers. The e n o r m o u s potential for this accelerator application can be j u d g e d o n the basis that, d e p e n d i n g on the sulphur content of the coal being burned, typically 2-5% of the electrical o u t p u t of a coal fired power plant w o u l d have to be used in electron beam power to meet current environmental requirements in a n u m b e r of countries. A single moderately large 2000 M W e power plant w o u l d , therefore, require 40100 M W of electron beams — more power than is presently installed for all industrial accelerator applications c o m b i n e d . n) Electronuclear Breeding Electronuclear breeding is the term used to describe the process of using electrically generated neutrons t o transform fertile isotopes into fissile material, suitable for use as nuclear reactor fuel. Examples are 238 U into 239 Pu or 232 Th into 233 U. The world's resources of the above m e n t i o n e d fertile isotopes exceed by several orders of magnitude those of 235 U, the fissionable isotope driving today's power reactors, so electronuclear breeding is an alternative approach to breeder reactors for extending the life of the fission process for electricity generation. Accelerators can be used to generate the neutrons required for fuel breeding t h r o u g h the spallation process w h e r e b y a single high energy particle can release 20-30 neutrons f r o m a heavy element target. For example, a 1 GeV p r o t o n o n a lead-bismuth eutectic target will p r o d u c e 20 neutrons. The economics of fuel breeding dictate a high average beam current (typically 0.1-0.5 A) and a high electrical efficiency. Studies in Canada and the USA over the past 35 years have all led to the choice of a linear accelerator at 100% duty factor for this application. Beam powers up to 300 M W (1 GeV at 300mA) have been considered' 2 0 ' that w o u l d provide a source strength of 4 * 10 19 n/s. The e c o n o m i c viability of electronuclear breeding is closely tied to the w o r l d supply of 235 U. The first large scale electronuclear breeder program was initiated in the USA in the early 1950's but ended abruptly w h e n new ore bodies were discovered in Colorado. There was renewed interest in both Canada and the USA in the late 1970's. However, the rapid decrease in reactor b u i l d i n g c o u p l e d w i t h the discovery of more and richer uranium deposits has pushed the need for obtaining our fissile requirements from other than mining far in the future and development of accelerator breeding facilities has been shelved. A linear accelerator is generally agreed to be the most electrically efficient means of generating the high current p r o t o n beam required for fuel breeding. A typical design w o u l d use a RFQ structure (see Fig. 6) for the first 2 MeV, then a drift-tube linac up to 200 MeV and finally a coupledcavity linac up to 1 GeV. The three different structures are used in the velocity range where they are most efficient in converting radiofrequency power into beam power. This efficiency dominates the design because by far the largest estimated cost in the facility is for the radiofrequency power. o) Strategic Defence Initiative SDI, better k n o w n as Star Wars, proposes the use of high power ion accelerators and laser beam systems driven by electron accelerators as directed energy weapons. In both, cases, the accelerator parameters are beyond those available Xa Physique au Canada juillet 1988 91 w i t h current technology and significant advances are needed to achieve the beams required to satisfy the military demands of the system. The directed energy weapon cannot consist of charged particles because the beam w i l l encounter weak magnetic fields along its trajectory to the target, so an H- or D-beam is accelerated and then stripped to give a Neutral Particle Beam (NPB). An energy of the order of 100 MeV is needed t o penetrate the target adequately and a current of several h u n d r e d mA at essentially 100% duty factor is required to provide adequate damage. (A dwell time of 10 seconds on an individual target is needed for a "structural kill"' 2 1 '; a shorter period is required if the beam is used for target discrimination.) The proposed accelerator system consists of a RFQ accelerator for the first few MeV of energy gain f o l l o w e d by a drift t u b e linac t o the final energy. Unlike most nonresearch applications, an important beam parameter is the emittance, because the beam is required to be only a metre or so in diameter w h e n it reaches the target a few thousand kilometres away — that is a divergence of the order of a microradian. Negative ion sources exist that can deliver beams w i t h current and emittance near the desired values but accelerating the beam to the required energy and then stripping it w i t h o u t phase space deterioration has yet t o be demonstrated. Development of the large aperture ion optics and reducing the weight of the radiofrequency power source will also require significant effort. Laser weapons must also have high brightness t o ensure a great enough power density o n the target to destroy it. The brightness of a laser weapon is inversely proportional to the square of the wavelength so transmission considerations argue in favour of shorter wavelengths. O n the other hand, the wavelength f r o m free electron lasers is inversely proportional t o the square of the energy of the electron beam so the size of the accelerator increases as the wavelength decreases. A suitable compromise wavelength is 1 micron. Both i n d u c t i o n linacs and coupled-cavity pulsed radiofrequency linacs have been used to accelerate electrons for FEL's. A beam energy of 100 MeV and a pulse current of several h u n d r e d amperes w i t h i n a normalized emittance of 30 pi m m - m r a d is required for this weapons application. RF linacs have c o m e close to these parameters but the conversion efficiency and average current must each be increased by an order of magnitude to satisfy the accelerator requirements of the weapons system.' 21 ' p) Rock Spading and Tunneling I n d u c t i o n accelerators can produce very short multi-kA elect r o n beam pulses at energies of several MeV that have potential uses in a number of highly specialized applications. O n e application that was investigated extensively in the early 1970s was the use of electron accelerators to induce rock spalling.' 2 2 ' Intense beam pulses of 50 to 100 ns were shown to reduce many types of rock to fine p o w d e r or flakes by a mechanism called shock spalling. The energy deposited in the rock by the short pulsed beam generates a shock stress greater than the tensile strength in a localized area several m m in depth, and therby induces spalling at the rock surface. The key to the process is that the energy is deposited in a time short e n o u g h that the stress waves can not travel significant distances compared to the dimensions of the stressed v o l u m e and a very high local stress transient results. Avery et al' 23 ' showed that a single 64 kj pulse at a nominal energy of 9 MeV p r o d u c e d spalls 7 to 15 m m deep corresp o n d i n g t o a total v o l u m e of 50 t o 80 cubic centimeters in a w i d e variety of rock types. These experiments led to a conceptual design of a t u n n e l i n g device that c o u l d be built a r o u n d a high power i n d u c t i o n linac. The proposed accelerator w o u l d have an average beam power of 9 M W and 92 Physics in Canada July 1988 w i t h an appropriate beam scanning system the tunneling device w o u l d be capable of advancing a 6.4 m diameter t u n n e l at a rate of 3.2 m per hour. The spalled debris, generally in the form of sand, dust and small flakes w o u l d be removed in a slurry. The predicted rock removal rate of approximately 100 cubic meters per hour is about a factor of ten higher than can be achieved by conventional drill/blast techniques. The accelerator proposed w o u l d be required to produce 5 MeV, 5 kA pulses per second. Although significant advances have occured in induction linac technology in the intervening thirteen years no linacs have yet approached these average power levels even under ideal conditions. It is highly unlikely that a practical accelerator-based tunneling device will be in operation until well into the next century. Ill SUMMARY Accelerators have been tools in the physicist's arsenal since the early 1930's and the requirements of the research laboratory have spawned most of the significant advances in the technology of accelerating charged particles ever closer to the velocity of light. The characteristics needed in medical and industrial applications frequently differ considerably from those in the laboratory but it is from the developments for scientific goals that the practical applications have sprung. Some of these applications, for example p h o t o n radiotherapy, have reached such a degree of maturity that thousands of machines are in operation and the users have a choice of commercial suppliers. Others still rely o n accelerators in research laboratories for the machine time t o prove the efficacy of the application. The variety of applications, existing and proposed, ensure a bright future for this fascinating product of physics research that was developed w i t h o u t practical applications in mind. REFERENCES: 1 H. Blosser et al Proc 11 Int.Conf. Cyclotrons. Tokyo (1985) p. 157. 2 F.Cole et. al. Proc. 1987 IEEE Particle Accelerator Conference p. 1985. 3 D.D. Comastra Industrial Research and Development, Sept. 1981 p. 116. 4 J.F. Lamb IEEE Trans. NS-28 1916. (1981). 5 Panel on Prospects for Industrial Electron Beam Processing, 6th International Meeting on Radiation Processing, Ottawa, 1987. 6 R.W. Baker et al U.S. Dept. Agriculture Rept. PB 84-186998 (1984). 7 N. Getoff and S. Solar Radiat. Phys. Chem. 31 12, 1987. 8 W . Scharf Particle Accelerators and Their Uses Harwood Press, p. 890,1986. (This is an excellent general reference for further reading.) 9 Ibid. p. 900. 10 Varian Radiation Division Newsletter 2 No. 2 (1984). 11 G. King et al Nucl. Inst. Methods B24/25 990, 1987. 12 K. Nassau Gems and Gemology XXI 26, 1985. 13 C. Bieth private c o m m u n i c a t i o n (1987). 14 M.I. Current Nucl. Inst. Methods B-6 9. (1985). 15 H. W i n i c k Nucl. Inst. Methods A261 9, 1987. 16 Proc. 8th Int'l. Free Electron Laser Conf., Glasgow, U.K. Nucl. Inst. Methods A259 (1986). 17 J.S. Fraser IEEE Trans. NS-26 1455, 1979. 18 S. Hashimoto et al Radiat. Phys. Chem. 31 109, 1988. 19 New Scientist 11 July, 1985 p. 28. 20 S.O. Schriber Atomkernenergie-Kerntechnik 44 177,1984. 21 N. Bloembergen, C.K.N. Patel et. al. Rev. M o d . Phys. 59 No. 3 Pt. 2 (1987). 22 R.T. Avery et al IEEE Trans NS-22 1798, 1975. 23 R.T. Avery et al IEEE Trans NS-20 1010, 1973. 24 G.E. McMichael et. al. Proc. 1987 Particle Accelerator Conference p. 1875. Intercalation Batteries: Probing Solid State Physics Using Electrochemistry J.R. Dahn Moli Energy Limited 39S8 Myrtle Street Burnaby, B.C. VSC 4C2 and W.R. Mc Kin non Division of Chemistry National Research Council of Canada Ottawa, Ontario K1A 0R9 ABSTRACT L i t h i u m i n t e r c a l a t i o n batteries, like t h e MOLICEL®, have a great f u t u r e as rechargeable p o w e r sources w h i c h o p e r a t e near r o o m t e m p e r a t u r e . Features u n i q u e to these batteries can be s t u d i e d t o learn a b o u t t h e physics of intercalation. INTRODUCTION L i t h i u m i n t e r c a l a t i o n batteries are t h e state-of-the-art in amb i e n t t e m p e r a t u r e rechargeable batteries. For a given mass, t h e y store m o r e e n e r g y than c o n v e n t i o n a l rechargeable batteries a n d deliver just as m u c h p o w e r . They can be c h a r g e d a n d d i s c h a r g e d h u n d r e d s of times, t h e y last for years, a n d t h e y can be p r o d u c e d cheaply e n o u g h t o c o m p e t e w i t h c o n v e n t i o n a l systems. They are also a p p e a r i n g in solid state physics labs, not t o p o w e r t h e e q u i p m e n t but t o be used in e x p e r i m e n t s t o study t h e physics of intercalation. Intercalation is t h e reversible insertion of guest atoms i n t o host solids, p r o v i d e d t h e s t r u c t u r e of t h e host is not significantly altered. M a n y solids can be v i e w e d as a host matrix that contains guest atoms o r molecules. In metal hydrides' 1 ', t r a n s i t i o n metals a n d their alloys p r o v i d e a lattice of sites for h y d r o g e n atoms. G r a p h i t e can a c c o m m o d a t e a w i d e variety of guests b e t w e e n its c a r b o n layers' 2 ' 3 '. Gas hydrates c o n t a i n m o l e c u l e s of h y d r o c a r b o n s such as m e t h a n e in cages of water molecules' 4 - 5 '. Historically, these a n d o t h e r classes of guest-host solids have been s t u d i e d i n d e p e n d e n t l y , because each has a separate application. M e t a l hydrides are potential storage systems for h y d r o g e n gas. G r a p h i t e intercalation c o m p o u n d s may someday replace c o p p e r for carrying electricity. Gas hydrates in t h e n o r t h a n d u n d e r t h e oceans are an u n t a p p e d source of natural gas. T h e r e are a large n u m b e r of terms t o describe these systems: i n c l u s i o n c o m p o u n d s , insertions c o m p o u n d s , intercalation comp o u n d s , guest-host c o m p o u n d s , a n d solid solutions, t o name a few. W e shall use t h e t e r m " i n t e r c a l a t i o n c o m p o u n d " t o refer to any of these systems. In t h e mid-seventies, it was realized that t h e reversibility of inserting a n d r e m o v i n g t h e guest f r o m t h e host c o u l d be e x p l o i t e d t o make rechargeable batteries' 6 '. The most p r o m ising guest a t o m for batteries is l i t h i u m ; l i t h i u m metal electrodes are light, l i t h i u m batteries have h i g h voltage, a n d l i t h i u m can be e l e c t r o p l a t e d efficiently in some organic solvents. Figure 1 shows a cell made by M o l i Energy Limited w i t h n a t u r a l l y - o c c u r r i n g m o l y b d e n u m disulfide ( m o l y b d e nite) as t h e host. This intercalation cell can be recharged t w o or t h r e e h u n d r e d times over 80% of its range. (In n o r m a l use, a u t o m o b i l e batteries are c y c l e d o n l y over a small f r a c t i o n of t h e i r range.) It stores t w o to t h r e e times as m u c h energy per unit mass as lead-acid or n i c k e l - c a d m i u m batteries, a n d it can retain its charge for u p t o ten years, c o m p a r e d t o o n l y a f e w m o n t h s for t h e o t h e r t w o . A l t h o u g h t h e r e are c o m p l i c a t i o n s in m a k i n g a c o m m e r c i a l battery that can exploit all t h e potential of this idea, t h e c o n c e p t of a l i t h i u m intercalation cell is simple (Figure 2). There are t w o electrodes: o n e is l i t h i u m metal, t h e o t h e r some host w h i c h can f o r m an intercalation c o m p o u n d w i t h l i t h i u m . ELECTROLYTE Fig. 1. Commercial Li/MoS 2 intercalation cell manufactured by Moli Energy Limited, Burnaby, British Columbia (this is an "AA" cell, about 6 cm high). MOLI and MOLICEL are registered trademarks of Moli Energy Limited Fig. 2. Schematic of a LI intercalation cell. The electrolyte is an organic solvent with a dissolved Li salt. Xa Physique au Canada juillet 1988 93 Between the electrodes is an electrolyte, a lithium salt dissolved in an organic solvent. The electrolyte provides a pathway for l i t h i u m ions between the t w o electrodes, and the external circuit provides a pathway for electrons. As the cell discharges, lithium atoms are stripped f r o m the lithium electrode and separated into electrons, w h i c h travel t h r o u g h the external circuit, and ions, w h i c h travel t h r o u g h the electrolyte. The electrons and ions rejoin at the surface of the intercalation c o m p o u n d , and diffuse f r o m the surface into the bulk. Thus the overall reaction is just a transfer of lithium atoms f r o m l i t h i u m metal t o the intercalation c o m p o u n d ; the transfer occurs because the free energy of a l i t h i u m atom is lower in the intercalation host than in lithium metal. W h e n the cell is recharged, the reaction reverses; l i t h i u m leaves the intercalation c o m p o u n d and electroplates o n t o the lit h i u m electrode. It is because the structural changes in the host are small and because lithium can be made to electroplate efficiently that these cells can be charged and discharged hundreds of times. O n e striking feature of intercalation batteries is the large variation of their voltage w i t h the state of charge. The voltage of any battery decreases as the battery discharges, but most of the decrease w e are familiar w i t h (the d i m m i n g of a flashlight as the batteries run d o w n , for instance) is caused by an increase in the battery's internal impedance. The voltage measured at low current or on open-circuit varies only by a few millivolts over most of the life of ordinary batteries. The voltage of an intercalation battery, o n the other hand, can vary by volts; as an example, Fig. 3a shows the voltage of a LLTaS 2 cell as a f u n c t i o n of x, the molar ratio of Li to TaS 2 (7 '°\ This voltage variation is not caused by varying impedances; if it were, the data measured d u r i n g a discharge of the cell w o u l d be different f r o m that d u r i n g a charge. A l t h o u g h such a variation in voltage is undesirable in some applications, it does have practical value, for it provides an instant measure of the state of charge of the cell. It also contains a great deal of information about the intercalation process. The derivative -(<9x/<9V)T of Fig. 3a, shown in Fig. 3b, has a series of peaks and minima, each of w h i c h can be related t o changes in the host or in the arrangement of the Li atoms in the host. It is the use of intercalation batteries as a t o o l in fundamental research that w e want to stress here. In particular, w e shall discuss what the voltage of an intercalation battery measures, and h o w features like those in Fig. 3 can be understood in terms of simple models of intercalation. perhaps about the chemical potential of atoms in an ideal gas, but otherwise they get little exposure to chemical potentials. O n e reason for this lack of instruction is that physicists generally d o not measure chemical potentials. W i t h intercalation batteries, however, they can. Moreover, the behaviour of the chemical potential of some of the intercalation c o m p o u n d s is an excellent illustration of h o w the chemical potential reflects such processes as phase separation and ordering. The simplest way to measure the chemical potential versus x for an intercalation c o m p o u n d is to charge or discharge a intercalation cell at a constant current. Then x is proportional to time, w i t h the constant of proportionality set by the current and the mass of host in the cell. The currents must be kept small enough so that the host is always near equilibrium; if the current is t o o large, concentration gradients of Li develop in the particles of host in the electrode. Such gradients cause the voltage to be larger w h e n the cell is charging and smaller w h e n it is discharging, so a simple check that the cell is near equilibrium is to compare V(x) measured on charge and discharge, as in Fig. 3a. To understand behaviour like that in Fig. 3, we need some model of intercalation. In many lithium intercalation compounds, the lithium spends most of its time localized on specific sites in the lattice, only occasionally j u m p i n g between sites. It is a g o o d approximation to ignore this m o t i o n in calculating the thermodynamics, and to consider the intercalation c o m p o u n d as a lattice of sites where each site is either empty or occupied by one atom. The host has t w o roles in this picture: it provides the lattice of sites where the guests reside, and it determines the interactions between the guest atoms. These interactions are complicated: they consist of C o u l o m b interactions screened by the electrons in the host, and elastic interactions caused by the distortion « 2.3 >o Chemical Potentials and Lattice Gas Models The voltage of an intercalation cell like that in Fig. 3 is directly proportional to the chemical potential of the guest in the host' 9 ', and it is this relationship that makes intercalation cells useful in studying intercalation. To see h o w this relationship arises, consider the w o r k done in transferring one lithium atom between electrodes. The w o r k done o n the cell is the charge o n an electron, -e, times the potential difference t h r o u g h w h i c h the electron moves, V. This w o r k is equal to the change in free energy of the cell, w h i c h is the chemical potential of l i t h i u m in the host, fi, minus that in lithium metal, ju0. Therefore, -e/V-M-Mo (1) All it takes to measure the chemical potential of lithium in the host as a f u n c t i o n of l i t h i u m concentration is an intercalation cell, a voltmeter, and some electronics to measure and c o n t r o l the charge passed t h r o u g h the cell. (In addition, the cell's impedance is related to the rate of diffusion of l i t h i u m in the host' 9 ', but w e will limit our discussion to the chemical potential in equilibrium.) At best, physics students learn about the Fermi level of electrons in solids (the chemical potential of electrons) and 94 Physics in Canada July 1988 i5 3.0 >o > \ X 0.0 0.2 0.4 x in 0.6 LixTaS2 Fig. 3. (a) The voltage V(x); and (b) the inverse derivative of (a), -(<9x/<9V)T, versus x in LixTaS2 of a Li/LixTaS2 cell. of sites by t h e guests. It is hard t o calculate such interactions f r o m first principles, a l t h o u g h there has been some success in metal hydrides' 1 0 '. M o r e c o m m o n is t o take t h e interactions as m o d e l parameters. Such models of atoms o n sites are called lattice-gas models' 1 1 '. They are equivalent t o Ising models' 1 2 ', w h i c h m o d e l magnetic solids as lattice of spins w h e r e each spin can p o i n t either up or d o w n . There is a large literature of w o r k o n Ising models, and this literature can be used as a basis for u n d e r s t a n d i n g intercalation c o m p o u n d s . W e shall discuss t w o systems w h e r e these lattice gas models have been especially successful. t h e n u m b e r of ways t o r a n d o m l y place n atoms o n t h e lattice, since the atoms w i l l be randomly d i s t r i b u t e d over the sites in the absence of interactions. If there are N sites in the lattice and Nx = n are filled, t h e free energy is F = N[E 0 x + kTfxlog(x) + (1-x) log(l-x)]] M = E0 + kT log[x/(1-x)L -((Jx/<JV)T = e(d\/dfi)T For Li x Mo 6 Se 8 ' 1 5 - 1 6 ', V(x) is a s m o o t h curve (Fig. 5a) and -(<9x/ <9V)t a single peak (Fig. 5b), simpler than in most intercalation c o m p o u n d s . This system is thus a simple test for lattice gas models; if they c a n n o t explain Fig. 5, they are unlikely t o be useful in m o r e c o m p l i c a t e d cases. (3) w h i c h leads t o an s-shaped curve for the voltage versus x, similar t o that in Fig. 5a. The derivative -(dx/<9V)T is Attractive Interactions and Li x Mo 6 Se 8 W e begin w i t h a system w h e r e the d o m i n a n t interactions b e t w e e n intercalated Li atoms are long-ranged and attractive. This is Li x Mo 6 Se 8 , w h o s e structure is s h o w n in Fig. 4. It is o n e of t h e Chevrel c o m p o u n d s ' 1 3 ' , n a m e d for Roger Chevrel, w h o r e p o r t e d t h e first of these materials in 1971' 14 '. The host is made of cubes of Mo 6 Se 8 , w i t h Se o n the corners and M o in t h e centers of t h e faces. These cubes sit o n a lattice w h i c h is almost simple cubic, but are rotated about o n e of t h e b o d y diagonals of the lattice by about 25 degrees. This r o t a t i o n breaks t h e c u b i c symmetry; Li x Mo 6 Se 8 is r h o m b o hedral for x < 1. The largest sites for guest atoms lie o n this same b o d y diagonal, and are also s h o w n in Fig. 4. There is o n e such site for each Mo 6 Se 8 cube, so filling all these sites w i t h Li gives L^MogSeg. It is possible to prepare Li x Mo 6 Se 8 for 1 < x < 4, b u t w e shall consider o n l y x < 1 here. (2) w h e r e E0 is t h e energy of a Li atom on the lattice. From (2), the chemical potential /u is = x(1-x)/(kT/e) (4) A graph of Equation (4) is a parabola, w h o s e m a x i m u m at x = 1/2 is 1/(4kT/e). Since kT/e is 25 mV at r o o m temperature, this m a x i m u m is 1 0 V ° , t o o small t o explain Fig. 5b. To make t h e m o d e l m o r e c o m p l i c a t e d (and hence m o r e flexible), w e can i n t r o d u c e an interaction b e t w e e n Li atoms o n d i f f e r e n t sites, or an interaction b e t w e e n spins in t h e equivalent Ising model. It is these interactions that make t h e Ising m o d e l interesting; unfortunately, it is rarely possible t o solve t h e m o d e l exactly. A useful a p p r o x i m a t i o n is t h e meanfield a p p r o x i m a t i o n , w h i c h includes the energy of interaction of the atoms, b u t assumes t h e atoms are still r a n d o m l y d i s t r i b u t e d even w i t h w i t h the interactions present. (This is o f t e n a p o o r assumption; if the interactions are o n l y b e t w e e n nearby atoms, t h e atoms w i l l rearrange themselves t o take advantage of attractive interactions or to avoid replusive ones.) The total interaction energy of this r a n d o m arrangement w i l l be Ux 2 /2, w h e r e U is the total interaction of o n e atom w i t h all t h e others w h e n t h e lattice is full. I n c l u d i n g this in t h e 2.20 W e shall start w i t h t h e simplest case: a n o n - i n t e r a c t i n g lattice gas, w h e r e there are no interactions b e t w e e n guest atoms o n d i f f e r e n t sites. The free energy of such a lattice gas is a sum of t w o terms: t h e energy, w h i c h is p r o p o r t i o n a l t o t h e n u m b e r of filled sites and hence t o x; and t h e entropy. The e n t r o p y is just minus the Boltzmann constant, k, times . 3 • MO o x x in Lix Mo„Se n 6 8 MMOgXg Fig. 4. The structure of the Chevrel compound Li x Mo 6 Se 8 . Fig. 5. (a) The voltage V(x); and (b) the inverse derivative of (a), -(<9X/<?V)t versus x in Li x Mo 6 Se 8 of a Li/Li x Mo 6 Se 8 cell. The solid circles are data from the discharge in (a) (solid curve), the squares from the charge (dashed curve). The solid curve in (b) is calculated from the mean-field expression (6). Xa Physique au Canada juillet 1988 95 expression for the free energy leads to an extra term in the expression for the chemical potential, n ' E0 + kT log[x/(1-x)] + Ux (5) The expression for -(dx/<9V)T becomes -(<?x/<?V)T - 1/[(kT/e)/[x(1-x)] + U/e] (6) W i t h this extra term, w e can adjust the slope of the voltage curve versus x and the height of the peak in -(<9x/<9V)T. Making U positive (repulsive interactions) causes the voltage t o d r o p more rapidly w i t h x , because the i n c o m i n g atoms feel more and more repulsion as the lattice fills. Making U negative causes the voltage to d r o p less rapidly. W h e n mean-field theory was first used to describe intercalation batteries, Equation (5) was used to get a rough estimate of the size of U f r o m the average slope of V(x); -(<?x/<?V)T, however, was never accurately described in Equation (6). But for Li x Mo 6 Se 8 mean-field theory is exact w i t h i n experimental error; the solid curve in Fig. 5b is Equation (6) w i t h U - -0.090 eV. After years of no better than semi-quantitative agreement between experiment and theory, w e were hardly prepared for the agreement in Fig. 5. The shape of -(<9x/(9V)T should be temperature dependent according to Equation (6), and the maximum at x - 1/2, (U/e + 4kT/e) -1 , should increase as U becomes more negative. Figure 6 compares -(dx/dV) T for several temperatures w i t h the predictions of the mean-field approximation. Eventually the peak in -(dx/dVYf should diverge at a critical temperature T c = U/4k, w h i c h is -11 C for U - -0.0904 eV, t o o low t o see w i t h the electrolyte used in the experiments. This is the same kind of critical point as in a liquid-gas system; at lower temperatures, there will be phase separation of a c o m p o u n d near x - 1/2 into one of lower Li content and one of higher, w i t h the difference in the Li contents increasing w i t h decreasing temperature. This phase separation has recently been observed 116 '. For T < T c - 267 K, Li 0 5 Mo 6 Se 8 is comprised of t w o co-existing phases, whose compositions are well predicted by the mean-field theory. W h y does the mean-field theory w o r k so well? Since it is based on a random distribution of the guest atoms in the host above T c , the guest atoms probably do have such a random arrangement. This suggests the interaction between the Li atoms is long-ranged, for in that case Li atoms c o u l d not lower their energy by disturbing the random distribution. In fact, mean-field theory becomes exact w h e n a given atom interacts equally w i t h all the other atoms in the host. Such an interaction of infinite range is caused by the elastic distortions that guest atoms p r o d u c e in the host lattice. The distortion in the host at one site caused by an atom on another site has a c o m p o n e n t that arises f r o m the boundary conditions o n the elastic host' 1 0 '. This c o m p o n e n t depends only weakly on the distance between the atoms. This c o n t r i b u t i o n to the interaction energy has been shown to be important in metal hydrides '10>. The theory of this elastic interaction relates U t o the expansion of the lattice caused by the guest atoms. W h e n the lattice expands linearly w i t h x (as it does in Li x Mo 6 Se 8 for x < 1), U can be calculated f r o m the lattice expansion and the elastic constants of the host' 10 '. Such a calculation for Mo 6 Se 6 gives' 15 ' U - -0.05 eV, c o m p a r e d to the experimental value of -0.090 eV. But the experimental value of U might also include interactions of short range if these are weak enough not to disturb the random distribution of the atoms. The difference between the experimental and calculated values of U might be due to such short-range interactions. At least half of the total interaction, however, must be of long range; calculations of lattice gas models w i t h only short-range interactions cannot r e p r o d u c e the experimental results in Fig. 6. 96 Physics in Canada July 1988 Short Range Interactions and LixTaS2 In many intercalation hosts, the guest gives up electrons to the host band structure or accepts electrons f r o m it, residing in the host as an ion. These ions then interact t h r o u g h a C o u l o m b interaction. The hosts studied as electrodes in electrochemical cells must be g o o d conductors so that they can carry large currents, so ions in these hosts are well screened. Indeed, in some cases the ion and its screening c l o u d have almost the same electron distribution as the neutral atom' 1 8 ', so it is reasonable to refer to the ion and its screening cloud as intercalated " a t o m s " even w h e n charge is transferred between the guest and the host. Short-ranged repulsive interactions such as screened Coul o m b interactions should produce ordered states in w h i c h the intercalated atoms occupy only a sublattice of the available sites. Such ordered arrangements are often f o u n d in atoms adsorbed on surfaces' 19 '. But the effects of short-ranged interactions can be masked by the long-ranged interactions caused by the lattice expansion. In Li x Mo 6 Se 8 , where Li atoms are seprated by at least 6.7 Â for x < 1, the electrostatic interaction should be well screened The effects of shortranged interactions are best seen in hosts where the lattice expansion is small and where the Li atoms are separated by only 3 or 4 Â . There is a class of hosts where short-range interactions d o make their presence felt. The layered transition metal dichalcogenides first came to the attention of physicists w h e n it was f o u n d that in many of t h e m the c o n d u c t i o n electons have a periodic distribution called a charge-density wave' 19 '. A solid like TaS2 has a layered structure composed of sandwiches of S-Ta-S. A l t h o u g h each sandwich is tightly held together, the b o n d i n g between adjacent sandwiches is weak, so the layers are easily pushed apart by a variety of guest atoms or molecules. W i t h large organic molecules, the spac- 160 120 en -t-> O > > <3 \ X d Fig. 6. -(<9X/<9V)t versus x in LixMo6SeB from Li/Li x Mo 6 Se 8 cells at several temperatures in degrees Celsius. The solid curves are calculated from the mean-field expression (6) with the same value of the interaction paremeter U used in Figure 5. ing b e t w e e n sandwiches can reach 50 Â . Even w i t h a small atom like Li, t h e sandwich spacing increases by 10%. The lattice expansion, however, is highly non-linear. The first Li atoms in t h e lattice d o most of the w o r k , and t h e lattice expands most w h e n t h e first guests enter. The lattice expands slowly e n o u g h w i t h x for x > 0.3 that the effects of shortrange o r d e r b e c o m e observable. M o r e o v e r , t h e Li atoms o c c u p y sites separated by o n l y 3.4 Â , close e n o u g h for C o u l o m b interactions t o be important. The elastic i n t e r a c t i o n is expected t o be i m p o r t a n t for small x in Li x TaS 2 , w h i l e the lattice is still e x p a n d i n g as Li is added. Because most of the expansion is p e r p e n d i c u l a r t o the layers, t h e r e is an added feature not present in Li x Mo 6 Se 8 : t h e phase separation can o c c u r separately in different layers. Thus these layered c o m p o u n d s can show mixtures of layers w h i c h have almost n o guest atoms and others w h i c h have a higher c o n c e n t r a t i o n . If t h e r e is even a small repulsion b e t w e e n guest atoms in d i f f e r e n t layers, the filled layers w i l l move as far apart as they can, leading to a regular alternation of filled and e m p t y layers, a p h e n o m e n o n k n o w n as staging. Staging is f o u n d most dramatically in graphite' 2 * 3 ', w h e r e c o m p o u n d s up t o a b o u t stage 10 (where each space filled w i t h intercalate is separated by 10 layers of carbon) have been reported. Staging has also been in layered transition metal dichalcogenides. In particular, there is a stage 2 structure in Li x TaS 2 near x - ,15' 8 '. The effects of t h e lattice expansion o n -(dx! <3V)t have been explained using simple models of springs and rigid plates' 2 0 '. For x < 0.25, Li x TaS 2 is a stage-one c o m p o u n d — all the layers are equally and u n i f o r m l y o c c u p i e d by Li — and the effects of t h e lattice expansion neglected. The principal short-ranged i n t e r a c t i o n is e x p e c t e d t o be a repulsion b e t w e e n Li atoms (or ions) o n adjacent sites in the same layer of the TaS2 host. The Li atoams in layered c o m p o u n d s o c c u p y a close-packed o r triangular lattice in each layer, w h e r e each site has six nearest neighbours. Such a lattice has t h e p r o p e r t y that it can be d e c o m p o s e d i n t o three interpenetrating sublattices, as illustrated in t h e inset to Fig. 7, so that t h e nearest n e i g h b o u r s of t h e sites o n o n e sublattice are all o n t h e o t h e r t w o sublattices. If atoms are placed o n l y o n o n e sublattice, 1/3 of t h e sites o n the lattice can be filled w i t h o u t placing any atoms o n adjacent sites. If the interaction is large c o m pared t o kT, this is the arrangement expected at x = 1/3. Similarly an o r d e r e d state is e x p e c t e d at x « 2/3 w h e r e t w o of t h e t h r e e sublattices are filled. (There is a particle-hole s y m m e t r y in lattice gas models w i t h pairwise interactions, equivalent t o t h e u p - d o w n spin symmetry of t h e Ising model.) O n t h e o t h e r hand, w h e n kT is large c o m p a r e d to t h e nearestn e i g h b o u r interaction U ^ e n t r o p y w i l l suppress t h e order, so t h e t h r e e sublattices of sites w i l l be equally filled. Thus t h e r e w i l l be an o r d e r - d i s o r d e r transition as a f u n c t i o n of T. There w i l l be a similar transition as a f u n c t i o n of x. At l o w x, atoms can be far apart o n t h e lattice, so the system can avoid m a k i n g nearest-neighbour pairs w i t h o u t d e v e l o p i n g long-range o r d e r , short range o r d e r alone is e n o u g h . As x approaches 1/3, however, having no nearest-neighbour pairs is o n l y possible for a state of long-range o r d e r . A similar p r o b l e m arises if w e imagine taking atoms o u t of the system near x = 1. They system can maximize t h e n u m b e r of bonds b r o k e n by e n s u r i n g that atoms are never r e m o v e d from adjacent sites. This can be d o n e w i t h o u t long-range o r d e r near x » 1, but n o t near x » 2/3. The simplest m o d e l that w o u l d show such o r d e r is again a lattice-gas m o d e l , this t i m e w i t h nearest-neighbour interactions. This m o d e l can be solved in various approximations; t h e phase diagram is s h o w n in Fig. 7' 21 '. The b o u n d a r y of Fig. 7 is phase transition f r o m t h e d i s o r d e r e d t o t h e o r d e r e d state; for this particular model, it is a higher o r d e r or con- t i n u o u s transition. Such phase diagrams are seen in adsorbed systems' 22 ', b u t there t h e measurements are usually made are as a f u n c t i o n of temperature, m o v i n g vertically in a diagram like Fig. 7. W i t h intercalation c o m p o u n d s w e can m o v e horizontally in t h e diagram. Suppose w e consider the chemical potential of this m o d e l at l o w temperatures. Below x = 1/3, each Li atom can f i n d a site w i t h no nearest neighbours, first because of short-range order, eventually because of long-range order. Thus t h e chemical potential is just E0, t h e energy of an isolated Li atom in the lattice. W h e n x increases past x = 1/3, o n e of t h e sublattices fills c o m p l e t e l y , so the Li must o c c u p y sites in o n e of t h e o t h e r sublattices. Each Li added n o w is repelled by three nearest neighbours, so the chemical potential rises t o E0 + 31^. Similarly at x = 2/3, the n u m b e r of nearest n e i g h b o u r pairs f o r m e d goes f r o m 3 to 6, so n j u m p s by a n o t h e r 3U 1 to E0 + 61^. The inverse derivative -(<9x/3V)T thus shows t w o minima, o n e at x = 1/3 and the o t h e r at x = 2/3. These m i n i m a disappear at high temperatures, w h e r e t h e Li are r a n d o m l y d i s t r i b u t e d over the sites, because t h e n t h e mean-field expression (Equation (4)), w h i c h shows no m i n i m a for 0 < x < 1, is valid. The o t h e r feature expected f r o m an o r d e r - d i s o r d e r transition is a peak in -(<9x/<9V)T at t h e transition, w h e n the system crosses t h e phase b o u n d a r y in Fig. 7. Such peaks are a general feature of so-called t h e r m o d y n a m i c response functions like compressibility or magnetic susceptibility, and arise f r o m the t h e r m o dynamic fluctuations near a phase transition. W e plot the inverse derivative of V(x), -(<9x/<9V)T, t o exploit the analogy between intercalation c o m p o u n d s and o t h e r m o r e familiar systems. THe free energy F of an intercalation c o m p o u n d changes as Li is added a c c o r d i n g to dF = v dx For a gas w i t h specific v o l u m e v at presssure p, t h e free energy changes w i t h v a c c o r d i n g t o dF = p dv H e n c e n of an intercalation system is analogous p a gas, and x is analogous t o v. C o n s e q u e n t l y -(<9x/<9V)T is analogous t o (<9v/<9p)T, w h i c h is p r o p o r t i o n a l t o t h e compressibility. Similarly, t h e free energy of a magnet in a magnetic field H P > Fig. 7. Phase diagram for a lattice gas with nearest-neighbour repulsive interactions U 1 on a triangular lattice. The inset shows the decomposition of a triangular lattice into three sublattices. Xa Physique au Canada juillet 1988 97 changes in response t o changes in the magnetization m per spin according to dF = H d m so v is analogous to H, x to m and -<(9x/(9V)T to the magnetic susceptibility ((5m/<9H)T. W e d o indeed see an order-disorder transition in LixTaS2. The voltage V versus x in Fig. 3a has t w o small steps near x = 1/3 and x » 2/3, and -(<5x/<?V)T in Fig. 3b has corresponding minima. Fig. 8 shows the inverse derivative -(dx/<9V)T near x = 2/3 (7) . The m i n i m u m is p r o d u c e d by the ordered arrangement of Li near x « 2/3, and the peaks o n either side by the phase transition as the system crosses the phase boundary cn >o > fO seperating the ordered and disordered states. These t w o peaks move together as the temperature rises, because the phase diagram closes near x = 2/3. From the positions of these peaks as a f u n c t i o n of temperature, we constructed the phase diagram in Fig. 9, the first phase diagram to be f o u n d in this way. Fig. 10 shows -(d\/dV)j calculated from a lattice gas model w i t h nearest neighbour interaction using M o n t e Carlo methods, showing semi-quantitative agreement w i t h the results of Fig. 8. Conclusions These t w o systems, Li x Mo 6 Se 8 and LixTaS2, provide the prettiest illustations so far of how intercalation batteries can be used to study the behaviour of Li intercalation compounds. The behaviour of these c o m p o u n d s has been studied by measuring the chemical potential, a measurement w h i c h is rare in physics. Even more powerful tools can be obtained by c o m b i n i n g this m e t h o d w i t h other measurements made in-situ in intercalation cells. To date, such in-situ measurements have been made of structure of the intercalation c o m p o u n d w i t h powder x-ray diffraction' 2 3 ' 2 4 ' and of the electric field gradients near the Li atom w i t h perturbed angular correlation' 2 5 ). W i t h such in-situ methods, changing the composition of a c o m p o u n d is as easy as changing the temperature in a traditional solid-state experiment. The chemical potential is a neglected quantity in physics. W i t h the development of electrochemical methods to study intercalation compounds, it should take its rightful place in undergraduate physics and chemistry courses. Intercalation c o m p o u n d s like those discussed in this article provide simple examples of h o w chemical potentials behave, and the lattice gas models used to describe the results are simple alternatives to the Ising model of magnetism in i n t r o d u c i n g students to statistical mechanics. X W e acknowledge helpful comments from R.R. Haering, C.M. Hurd, K. Brandt and J.A. Stiles. 2.1 V (Volts) Fig. 8. -(<9x/<9V)T versus V for a Li/LixTaS2 cell at several temperatures in degrees Celsius. -1 1 1 r 1 50 Disordered O o m p 40 1 • • +-> • o >^ >1 as M d> (X 1 1.5 30 0D0 a > 1.0 - 20 + • û Q 10 0.5 0.62 0.64 0.66 0.68 0.70 0.72 x i n Li„TaSFig. 9. Phase diagram for the order-disorder transition of Li in LixTaS2. The circles are from the values of x of the peaks in figure 9, the squares from Monte Carlo calculations. The solid curve is a guide to the eye. 98 Physics in Canada July 1988 * *a ° n aO • * tS a ° q_ û • r. if _L 0.60 . - <o \ X t> (0 H °a 2.0 2.1 V (Volts) 2.2 Fig. 10. -(dx/<?V)T calculated by Monte Carlo techniques for a lattice gas on a triangular lattice. The nearest-neighbour repulsions are the same as those in Figure 9. References 1. D.G. Westlake, C.B. Satterwaite, and J.H. Weaver, Physics Today, November 1978, p. 32. 14. R. Chevrel, M. Sergent, and J. Pringent, J. Solid State Chem. 3, 515 (1971). 2. J.E. Fischer and T.E. Thompson, Physics Today, July 1978, p. 36. 15. S.T. Coleman, W.R. M c K i n n o n and J.R. Dahn, Phys. Rev. B 29, 4147 (1984). 3. M.S. Dresselhaus, Physics Today, March 1984, p. 60. 16. J.R. Dahn and W.R. McKinnon, Phys. Rev. B 32, 3003 (1985). 4. D.W. Davidson, in "Water: A Comprehensive Treatise", Vol. 2, Plenum, New-York (1973), p. 115. 17. J.R. Dahn, W.R. M c K i n n o n , and S.T. Coleman, Phys. Rev. B 31, 484 (1985). 5. J.L. Cox (ed), Natural Gas Hydrates: Properties, Occurence and Recovery, Butterworth, Boston (1983). 18. N.A.W. Holzwarth, S.G. Louie, and S. Rabii, Phys. Rev. B 28, 1013 (1983). 6. M.S. W h i t t i n g h a m , Science 192, 1126 (1976). 19. F.J. DiSalvo and T.M. Rice, Physics Today, April 1979, p. 32. 7. J.R. Dahn and W.R. M c K i n n o n , Solid State C o m m u n . 48, 43 (1983). 20. J.R. Dahn, D.C. Dahn, and R.R. Haering, Solid State C o m m u n . 44, 29 (1984). 8. J.R. Dahn and W.R. M c K i n n o n , J. Phys. C. 17, 4231 (1984). 21. M. Schick, J.S. Walker, and M. Wortis, Phys. Rev. B 16, 2205 (1977). 9. W.R. M c K i n n o n and R.R. Haering, M o d e r n Aspects of Electrochemistry, Vol. 15 ed. by R.E. White, J. O ' M . Bockris, and B.E. Conway (plenum, N.V., 1983), p. 235. 22. M.W. Cole, F. Toigo, and E. Tosatti (guest editors), in Surface Science 125, 1-326 (1983). 10. H. Wagner, in " H y d r o g e n in Metals" Vol. 1, G. Alefeld and J. Volkl, (ed.), Springer, Berlin (1978), p. 5. 23. R.R. Chianelli, J.C. Scanlon, and B.M.L. Rao, J. Electrochem. Soc. 125, 1563 (1978). 11. T.D. Lee and C.N. Yang, Phys. Rev. 87, 410 (1952). 24. J.R. Dahn, M.A. Py, and R.R. Haering, Can. J. Phys. 60, 307 (1982). 12. E. Ising, Z. Phys. 31, 253 (1952). 13. O. Fischer and M.B. Maple (ed.), "Superconductivity in Ternary C o m p o u n d s I", Topics in Current Physics Vol. 32, Springer-Verlag, Berlin (1982), p. 165. 25. T. Butz, A. Lerf, and J.O. Besenhard, Rev. Chim. Min. 21, 556 (1984). 1988 CANADIAN UNDERGRADUATE PHYSICS CONFERENCE DALHOUSIE UNIVERSITY, OCTOBER 1 3 - 1 6 - Physics students from across Canada are invited to attend the four day conference and are encouraged to present a short talk, a poster or a major paper. - 7 invited guest speakers will talk on diverse physics related fields. Xa Physique au Canada juillet 1988 99 American Association of Physics Teachers 1987 Millikan Lecture Award Recipient: Donald Glenn Ivey The Robert A. Millikan Lecture Award is presented by the AAPT for "notable and creative contributions to the teaching of physics." There are few who have made more notable, creative, and visible contributions to the teaching of introductory physics than Donald Glenn Ivey. Donald Ivey was born in Clanwilliam, Manitoba, reared and educated from the primary grades through the masters degree level in Vancouver, received his Ph.D. at the University of Notre Dame, and has devoted 38 years of his life as a faculty member and administrator at the University of Toronto, where he has served as the Principal of New College and Vice-President for Institutional Affairs. Author, lecturer, and communicator of physics, he is probably most familiar for his memorable role with J.N.P. Hume in the ubiquitous PSSC teaching films "Frames of Reference," "Universal Gravitation," "Periodic Motion," and "Random Events." It may be less well known to the younger members of the physics teaching community that from 1958 to 1966 Ivey and Hume also prepared and presented over 100 half-hour television programs on physics for the Canadian Broadcasting Corporation and a series of shorter productions for the National Educational Television and Radio Corporation in the United States. Writing has also played an important part of Don Ivey's life. In 1955 he co-authored a physics text for high schools with R.W. McKay which was widely used. Ivey and Hume again joined forces in 1974 to write a twovolume introductory level college physics text published by Ronald Press. Dame and in 1975 the New College Library at the University of Toronto was named the Donald Glenn Ivey Library. In 1979 the AAPT bestowed upon him a Distinguished Service Citation. His contributions to the teaching and the public understanding of physics have earned him the respect and admiration of colleagues throughout the world. In the words of one, Don Ivey is "A teacher, a colleague, an administrator, a friend, a model for the public and for all of us. All that talent, but much too likeable to envy. Frequently upside down, but somehow always landing on his feet." An ever popular speaker, he has given dozens of lectures per year in locations as diverse as Thunder Bay, Oakville, New York, and Nanjing. Whether it be a keynote address, graduation talk, or school career day, he confesses that in 38 years he has never passed up the opportunity to speak to a teacher or student group. Mr. President, the Awards Committee is proud at this time to present the 1987 Robert A. Milikan Lecture Award to Donald G. Ivey. He has not been without honor in his own, or other countries. "Frames of Reference" won the Edison Award for the "best science education film of 1962." "Random Events" won a silver medal from the Science Institute in Rome. In 1965 he won an Award of Honor from Notre Reprinted with permission from American Journal of Physics 55, 12, December 1987 © American Association of Physics Teachers 100 Physics in Canada July 1988 "Educational television — An oxymoron?" Donald Glenn Ivey's acceptance speech for the 1987 Millikan Lecture Award presented by the American Association of Physics Teachers, 18 June 1987 Donald G. Ivey Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada Author's note: These words were intended to be said, not read, so please read t h e m w i t h this in mind. You had to be there! (After the citation, curtain opens to reveal D.G.I, hanging inverted. R.B.C. walks around him, says "You're upside d o w n " and D.G.I, replies " N o , you're upside d o w n , " and then t o audience "He's the one w h o is upside d o w n , isn't he?" Dismounts, moves t o podium.) Mr. President, distinguished guests, if any, ladies and gentlemen. Thank you Robert. I enjoyed the citation. I'm glad I came. As Gypsy Rose Lee or some other ecdysiast once observed, in order t o get the attention of an audience "Ya gotta have a g i m m i c k ! " M y g i m m i c k has been to start an address while upside d o w n . I started this nearly 30 years ago, and I'll tell you the truth, I'm not sure h o w m u c h longer I can keep it up! I'm w o r k i n g on something new (juggle one, two, then three oranges) but it still needs a little work. A second ecdysiastical principle is that to keep the attention of an audience y o u have t o reveal yourself, preferably gradually and gracefully, and I hope to d o that as well today — although perhaps in revealing my beautiful internal thoughts rather than my external physical charms. W h e n one receives an award that is deserved because of long and devoted service, it is a rewarding experience. O n the other hand, w h e n one receives a totally undeserved award, it is truly delightful!! I k n o w as you d o that there are many other members of AAPT w h o are m u c h more deserving of this award than I am — after all, I have spent nearly half of my 40 years as a physics teacher being a university administrator as well, and we all k n o w how little administrators c o n t r i b u t e to the basic educational enterprise. Anyway, I am absolutely delighted that this time the awards c o m m i t t e e has made a mistake. In order to let t h e m off the hook I decided the t h i n g to d o was present a brilliant, thoughtful, literate, p r o f o u n d address — my second t h o u g h t was t o try to distract your attention by t h r o w i n g in words like "ecdysiast" and " o x y m o r o n . " As some wise man, probably Casey Stengel, once said, "I've got n o t h i n ' to say, and I'm only going to say it once." "Educational Televison — An O x y m o r o n ? " Of course a literate audience like this knows what an o x y m o r o n is. For those of you w h o d i d n ' t look it up, it juxtaposes contradictory terms. The most popular example is "military intelligence," although in Canada "postal service" is providing stiff c o m p e t i t i o n . W e also have a political party, now in power, called the "Progressive Conservatives." From the title y o u deduce that I may say something about the question "Is educational television educational?" and I probably will, but as I am an academic you will not expect a simple clear-cut answer — you k n o w you will get an unequivocal " m a y b e . " (Is that another oxymoron?) W h a t I am really going to d o is tell you something about my o w n television experience, and hope that some useful messages emerge — or if not, that you don't notice. As Robert has noted in the citation, once upon a time, in the early days of television, w h e n it was black and w h i t e and live, my friend and colleague Pat H u m e and I prepared and presented about a h u n d r e d half-hour television programs. Have you ever observed the difficulty that people have in identifying as individuals pairs that come as a matched set? Those of you w h o have w o r k e d as half of a team or w h o have at least t w o children will be familiar w i t h this p h e n o m e n o n . W e had producers w h o after 12 programs still had troubles w i t h w h i c h was w h o m of us, particularly under stress. W h e n you yell at your kids d o you mix up their names? I digress. The team of H u m e and Ivey became quite well k n o w n in Canada and even in some parts of the United States. I often questioned the order of these names, and usually spoke of Ivey and Hume, although I p r o n o u n c e d it Ivey and whom? Incidentally, as many of you know Bob Resnick sometimes suggests that there is no Halliday — he just made him up for tax purposes. I have never denied the existence of Pat H u m e — I can't, because most of you have seen him in living celluloid. He always argued that H u m e and Ivey was e u p h o n ious, sounding like an a n t h r o p o m o r p h i c green wall vine " h u m a n ivy." His more c o m p e l l i n g argument was that the labeling of all famous teams was always alphabetical. You remember Allen & Burns, perhaps you even go back to Hardy & Laurel or TV's Martin & Rowan. In Canada our most famous team is Shuster & Wayne, often seen on Ed Sullivan. In music w h o c o u l d forget Hammerstein & Rogers, or even Garfunkel & Simon. In literature we had Juliet & Romeo (being p r o d u c e d in this theater this week) and Delilah & Sampson, but of course these were female-male teams, and the female naturally came first. I have to admit that Pat is right — alphabetical is sacrosanct and irrevocable! As I said, t h r o u g h o u t the length and breadth of Canada, H u m e and Ivey were household words. Actually in some households they were four-letter words because this was in the early days of TV and in many places only CBC-TV was available, so it was us or nothing, and some viewers t h o u g h t nothing w o u l d have been preferable. O n the w h o l e t h o u g h we were amazed at h o w many people were prepared to watch a program about pure physics — and even be enthusiastic about it. This was all so long ago and far away that most of you w i l l not have seen any of our epics, so before trying to tell you what I think their effect was, I am going to summarize what w e did, and show an excerpt. It started nearly 30 years ago w i t h a series we called Focus on Physics (Fig. 1); this was a joint venture — the University provided us, and the CBC provided p r o d u c t i o n facilities. The programs were live in the T o r o n t o area, and later shown on kinescope in other parts of Canada. As you may know, a kinescope recording is a m o t i o n picture of a TV screen, and the quality of r e p r o d u c t i o n is abysmal — that's w h y most programs in those days were live. TV tape recording was developed before the end of our TV careers, but in the early days of tape it was very difficult to edit, so all of our halfhour programs were shot in the real time of 26 min or so. Xa Physique au Canada juillet 1988 101 Focus o n Physics was so successful that the next year the CBC approached us privately, independent of the University, t o d o a series o n the national network, in p r i m e time, f r o m 10:30 t o 11:00 p.m. o n Thursdays f r o m July t h r o u g h September. W e called this series T w o for Physics, in part because it sounded like a n u m b e r series, 2,4,5,6, but mainly because w e were t w o for physics. W e had been unhappy about the image of physics (or science in general) that w e had perceived as being fostered by television. Scientists were usually presented as eccentric weirdos in w h i t e lab coats w i t h w i l d hair, w h e t h e r in commercials or in educational programs, and what was stressed was the mystery and the w o n d e r of science, making it seem like black magic. From the outset w e tried to present physics as a reasonable human activity carried o n by normal individuals in gray flannel suits. I'll c o m e back t o T w o for Physics in a moment, because I want to give y o u some idea of the sort of topics w e dealt with, but first I'll c o m p l e t e the summary of the series w e did. This series was successful enough that the CBC decided t o present a regular science series; they called it The Nature of Things. It began in 1960 and has been r u n n i n g continuously ever since, one of the longest r u n n i n g shows in TV anywhere. W e d i d programs as part of this series until 1965 — I'll show y o u a list of titles shortly. The first year of this series I acted as a host for all of the programs, but I was uncomfortable being the front man for programs I had no hand in preparing, so I stopped, even t h o u g h the CBC pressed me very hard t o c o n t i n u e because they recognized the importance of a c o n t i n u i n g face on this type of series. I was fortunate that my first affiliation was w i t h the University, so I could afford not t o d o whatever the Corporation demanded. For several years The Nature of Things f u n c t i o n e d w i t h o u t a permanent host, but for a long time n o w a w e l l - k n o w n Canadian geneticist, Dr. David Suzuki, has been the host. Like me, he agonized about w h e t h e r or not t o leave a university career to become a media personality, and I guess he ultimately d e c i d e d that he c o u l d make a significant c o n t r i b u t i o n t o the public understanding of science by this move; perhaps his b u m p of conscience is larger than mine. 1958 FOCUS O N PHYSICS — 13 half-hour programs produced live in Toronto and recorded on kinescope for use in other regions of the country. 1959 T W O FOR PHYSICS — 12 half-hour programs produced live for the CBC national network, 10:30-11:00 p.m. Thursdays, July-September. Later shown on kinescope on public broadcasting stations in the U.S. 1960 THE NATURE OF THINGS — Series began in 1960 and continues today. We did programs in the series until 1965. Early shows done live. Later videotape introduced, but not edited. 1962 THE IDEAS OF PHYSICS - One of three mini-series prepared for the Schools Broadcasts Dept. of the CBC: Time and Space Waves or Particles? Order or Chaos? Atoms and Nuclei (rebroadcast in 1965) 1963 THE NATURE OF PHYSICS - Rebroadcast on Schools Telecasts of five programs from The Nature of Things. 1965 THE CONSTANTS OF PHYSICS: G — The Gravitational Constant c — The Speed of Light e — The Fundamental Charge h — The Quantum Constant Fig. 1. TV series prepared and presented by D.G. Ivey and J.N.P. Hume for the Canadian Broadcasting Corporation. 102 Physics in Canada July 1988 N o w w e have in Ontario an educational network called TV Ontario, but this did not exist in the 60s, so the CBC had a Schools Broadcasting Department, and we d i d three short series for them, The Ideas of Physics in 1962, The Nature of Physics in 1963, and The Constants of Physics in 1965. The program titles are listed. W e really did not modify our approach because these programs were supposed t o be aimed at school children rather than a general audience, except that we tried t o be a little more subtle in our humor! W e often w o n d e r e d w h o watched these programs, broadcast d u r i n g school hours, because many schools d i d not have TV sets, and if they d i d the odds were against broadcast times coinciding w i t h physics class times — don't forget, VCRs had not been invented. W e suspected that daytime TV viewers t h o u g h t this was a rather dull soap opera w i t h a very small cast — The O d d Couple hadn't been invented yet either. This list covers the programs w e made for the CBC. Some were used in other countries including the United States and Australia. In addition, w e did a number of short segments for use by public broadcasting stations in the U.S. The public broadcasters [I think the organization was called NETRC (National Educational Television and Radio Corporation)] approached the CBC and suggested a joint venture — they w o u l d pay us, and the CBC w o u l d provide p r o d u c t i o n facilities. It t u r n e d out they paid us very well, but w e never f o u n d out if the programs were used in the U.S. I made reference to humor. W e r e our programs intended to be funny? Did we tell jokes? Certainly not. But people were so used to science courses and programs that were deadly serious that they thought we were hilarious just because w e didn't take ourselves seriously all the time. W e laughed at ourselves a little, but basically w e are pedagogues and w e tried never to let these self-deprecating attempts interfere w i t h our message. The program titles give you some idea of the sort of messages we tried to put across. We were not d o i n g applied physics — h o w the telephone works, or what t o d o until the plumber comes — but rather were attempting to explain the fundamental ideas of our subject. Here are the programs that w e d i d on T w o for Physics (Fig. 2), w i t h the titles and a few words about each one. To try to give you some idea of the kind of t h i n g we said I pulled out the o l d scripts, yellowed and mellowed w i t h age, and picked out one sentence from each to quote to you. It is impossible to convey m u c h in one sentence, but I hope these will show you that w e really were attempting to grapple w i t h the fundamentals of physics. You may w o n d e r w h y we had scripts, and there were several reasons. O n e was to clean up our language; in physics as in any other field w e use a lot of shorthand — words that have meaning for other physicists but not m u c h for outsiders. W e never used a technical w o r d unless s o m e h o w w e had defined it — and usually it turns out you can get along w i t h o u t it. Sometimes w h e n w e examined the cherished phrases that w e used for our classes, and t h o u g h t about what we were really saying, the answer was " n o t m u c h . " In addition, we were attempting to present physics w i t h o u t using what is often called the language of physics, mathematics, and that was a challenging constraint. Another important reason for a script was so that the producer w o u l d know exactly what w e were d o i n g at all times. The quality of the image in black and white TV is poor, and even w i t h color it is not marvelous, limited by the number of lines — and that is why you so often find a face filling the screen — you need this kind of close-up to really see expression. In our studios there were three cameras, each w i t h four lenses, and it was essential that the right camera w i t h the right lens and the right lighting be in place for every shot — and this is only possible w i t h a detailed script. You can't afford to wait w i t h n o t h i n g happening — after about 3s you have "egg on your face," as you will all have observed in the rare bits of live TV, like newscasts, that you see today. W e felt it important that our programs be as professional in appearance as any others, so that " e d u c a t i o n a l " TV was not seen by the viewers as a secondclass version of " r e a l " TV. To prepare a program w e picked out a few pieces of simple e q u i p m e n t that seemed relevant, roughed out a story line, and then divided it up into segments assigned to each of us. Then w e each w r o t e out the script for our segment and m e m o r i z e d it. W e c o u l d not use cue cards or teleprompters effectively because most of the time we were w o r k i n g w i t h bits of e q u i p m e n t , and it w o u l d have looked o d d to be peering resolutely in the direction of the camera. It was not particularly difficult t o memorize our o w n words, and we didn't have to be perfect, provided the producer knew precisely w h e n t o cut to close-ups of equipment, and w h e n w e had finished o u r segment. The only p r o b l e m was the modifications w e had to make d u r i n g rehearsals in the studio. A r u n - t h r o u g h w o u l d show that w e had written 35 min of material for a 26-min show. I was always the w o r d y one, taking up more than my share of time, so I w o u l d have to make the cuts — and that was difficult, removing great chunks of my immortal prose and remembering to unremember them. For each program w e normally d i d three rehearsals: first a " w a l k - t h r o u g h " w i t h o u t lines so that the producer w o u l d k n o w about lighting and cameras, then one w i t h lines for timing, w h e n w e w o u l d f i n d we were m u c h t o o long (we were never t o o short), and finally a complete dress rehearsal. W e w o u l d be in the studio for about 4 h altogether — a very exhausting 4 h. Let me get back to the one-sentence quotations I threatened you with. In the first program on Two for Physics I said, " A scientist hopes that he is moving in the direction of absolute truth, but he never expects to complete the journey." I was so pleased w i t h this pompous p r o n o u n c e m e n t that I used it verbatim in my textbook. In The Beginning of Confusion I c o n c l u d e d w i t h "Max Planck had drilled a hole in the dam that was physics, and this led to the f l o o d that is physics in this century." Isn't that colorful? In Atoms and Orbits I said "The way man thinks about the structure of atoms has been influenced by his long experience in thinking about orbits of planets and moons." I had a marvelous time here swinging a pail of water in a circle in a c r o w d e d TV studio. In The Wave-Particle Dilemma I said, "The story is more fascinating than fiction — and it's probably true." Pat used a q u o t e f r o m Louis de Broglie, "These more or less schematic idealizations w h i c h our m i n d constructs are capable of representing certain aspects of things but they have their limits and cannot incorporate into their rigid forms all the richness of reality." In this program one way we tried to illustrate the dual nature of nature was to introduce the dual nature of man t h r o u g h Stevenson's Dr. Jeckyll and Mr. Hyde. I was both of t h e m — it took 3 h to make me up as Mr. Hyde (Fig. 3). Pat said I never looked better. The title of the next program you will recognize as being from the limerick about "The y o u n g lady named Bright, W h o c o u l d travel faster than light. She set out one day, In a relative way. A n d returned the previous night." We discovered all about relativity by doing experiments on a flat car on a train that moves at 100 000 miles/s. It wasn't a real train. At the end of my remarks, I'm going to show a videotape of this program, for those of you w h o want to stay. In Man in the M i d d l e I asked, " A r e our ideas as to h o w things work, ideas f o r m e d in our world, valid in the other worlds — of things m u c h smaller or much larger?" 1. FROM NUCLEUS TO NEBULA — the scope of physics — physics based on experimental observations 2. THE BEGINNING OF CONFUSION — introduction of quantum ideas early in this century 3. ATOMS AND ORBITS — the solar system and the Bohr model of the atom 4. THE WAVE-PARTICLE DILEMMA — the dual nature of matter and radiation 5. IN A RELATIVE WAY — comparison of Newtonian and Einsteinian mechanics 6. MAN IN THE MIDDLE — the limitations of man's experience, and his attempts to deal with phenomena outside the range of his senses 7. OUR INVISIBLE ENVIRONMENT — the effects of gravity, air, and electromagnetic radiation 8. DEGRADATION OF THE UNIVERSE — energy a useful concept invented by man — forms of energy — the laws of thermodynamics 9. PROBING THE NUCLEUS — how we find out about the nucleus — radioactivity, accelerators, fundamental particles 10. FISSION AND FUSION — comparison of chemical and nuclear energy 11. DECAYING ATOMS — natural and artificial radioactivity 12. AT LOOSE ENDS — review of all programs — consideration of the randomness that underlines the orderly behaviour we observe Fig. 2. Two for physics. Program titles and brief summary of topics discussed. Let me digress a m o m e n t to tell you about the problems of publicity for programs like these. A young w o m a n from the CBC publicity department was talking to us, hoping to f i n d something she c o u l d use. W e were trying to explain about things outside the range of man's senses, and ment i o n e d ultrasonic d o g whistles. W i t h enthusiasm she reacted "Dogs — you're going to talk about dogs!" This became a cherished phrase for us. Whenever w e were having t r o u b l e explaining our aims to the publicists — for example, w h e n they wanted to illustrate publicity material by using either a picture of a nuclear explosion or a rocket blasting off (as they always did, these in their belief symbolizing science) w e amused ourselves by muttering "Dogs — you're going to talk about dogs!" In O u r Invisible Environment w e asked, "Gravity, air, radiation — we've talked about t h e m separately, but are they separate, or are there interactions between them?" and then we discussed some of the ways they interact. In Degradation of the Universe we never used the w o r d " t h e r m o d y n a m i c s " but w e did try to indicate what " e n t r o p y " measured. W i t h respect to energy, w e said, "Energy is one of the most useful concepts that man ever c o n c o c t e d to describe the w o r l d to himself — that's w h y the idea of energy has spread beyond the realms of science and become part of everyone's t h i n k i n g . " In Probing the Nucleus we started by p r o b i n g the nucleus of a canteloupe, and then ate it. After talking about all the particles and antiparticles w e said "This is a fascinating time for physicists — some believe most of the fundamental particles have been detected and w e are just around the corner from f o r m i n g a theory that will tie it all together, w h i l e Xa Physique au Canada juillet 1988 103 In Conservation Laws we started w i t h conservation of things and ended w i t h conservation of mass-energy. In a m o m e n t I'll show you the beginning of this one. Science Teaching Today was mostly about the PSSC course, w i t h a description of it and emphasis on its goals. W e had been doing programs o n physics w i t h o u t mathematics. In The Language of Physics w e tried doing a program o n mathematics w i t h o u t mathematics. Basically it was about the calculus operations of differentiation and integration, and what they did for physics. A Prize for the Lowest was a little about the Nobel Prize in general, but focused on Kamerlingh Onnes and his w o r k o n p r o d u c i n g low temperatures. W e described the fascinating p h e n o m e n o n of superconductivity, w h i c h of course is back in the news now w i t h the development of high-temperature superconductors. " D r i n k i n g " liquid air is always an effective demonstration, but it's dangerous, not so m u c h because of the danger of freezing your face as because of losing your audience; if they spend the next few minutes w o n d e r i n g why you d i d n ' t freeze your face, you lose t h e m for whatever important messages you are trying to impart. O n e of our precepts was " D o something, but not m u c h , " meaning that w e tried t o use lots of demonstrations, keeping t h e m simple, like d r o p p i n g a ball, rather than trying to use sophisticated apparatus w h i c h was t o o intrinsically interesting. No mysterious black boxes for us. Fig. 3. Dr. Ivey as Mr. Hyde. others believe the end of the story is m u c h farther away." W o u l d w e say anything different today, nearly 30 years later? In Fission and Fusion one statement was, "Energy is released in the process of rearranging things — if the things w e rearrange are atoms w e talk about chemical energy, if w e rearrange the nuclei of atoms w e call it nuclear energy." In Decaying Atoms w e said, " N o reason can be given for an atom t o disintegrate at a particular instant and not at some other t i m e — this was an example of something new in physics, an event w i t h o u t a cause." In t h e final program w e q u o t e d Whitehead, "Systems, scientific and philosophic, c o m e and go. Each m e t h o d of limited understanding is at length exhausted. In the end — t h o u g h there is no end — what is achieved is w i d t h of view." W e ended up by p o i n t i n g out, "This has been a series on physics appreciation. Just as talks o n music appreciation don't teach you to play an instrument, w e haven't tried to make you a physicist. W e have i n t r o d u c e d you to many of the great composers of physics, and hope that w e have been g o o d musicians." This is a list of the programs that we did in The Nature of Things series (Fig. 4). In Observation and Experiment w e summarized some of the experiments that led to our understanding of matter and radiation. W e started w i t h Aladdin's Law — whenever Pat r u b b e d a lamp, I appeared. In Physics and Games we distinguished between games of skill — skill that can be acquired because of the predictability of nature — and games of chance — where the only kind of skill is knowledge, knowledge of the probabilities involved. W e ended w i t h the question, is nature basically unpredictable? I o p e n e d this program talking while playing ping-pong, w h i c h was a challenge. The Speed of Light of course was another shot at explaining the concepts of relativity, w h i c h is always fun. 104 Physics in Canada July 1988 W e used the title Count on Me for the program on computers, in part because people more and more were c o u n t i n g on computers, but primarily to emphasize the fact that that is all computers really d o — count. Instant Electricity was about energy conversion in general, and thermoelectric devices in particular. Tubes to Transistors was really about c o m m u n i c a t i o n — the transfer of information from place to place, whether by sound, or light signals, or a boy on a bicycle. Pat was interested in the rapidly developing field of c o m p u t e r science, and we had done a program o n computers. As a polymer physicist, I demanded equal time, so w e did one o n rubber, The Way the Ball Bounces, examining, for example, the different molecular mechanisms involved w h e n the bounce of a steel ball and rubber ball are compared, and noting the anomalous thermoelastic behavior of rubber. Of course w e didn't use those words. At one point in this program I gave Pat one end of a long piece of rubber t o hold, and then I walked away pulling o n the other end until the rubber band was stretched and Pat was off camera. I used a heat lamp t o warm up the rubber and pointed out that it was pulling harder, trying to contract, not expand as normal solids d o w h e n heated. Just as I finish my message, Pat appears, 1960-61 OBSERVATION AND EXPERIMENT PHYSICS AND GAMES THE SPEED OF LIGHT CONSERVATION LAWS 1961-62 SCIENCE TEACHING TODAY THE LANGUAGE OF PHYSICS A PRIZE FOR THE LOWEST COUNT O N ME INSTANT ELECTRICITY 1962-63 TUBES TO TRANSISTORS THE WAY THE BALL BOUNCES NEW ATOMS FOR OLD FACT AND FICTION 1963-64 STANDARDS FOR COMPARISON LASER LIGHT 1964-65 LIES, DAMN LIES, AND STATISTICS Fig. 4. The nature of Things. peering over my shoulder. I ask " W h o ' s h o l d i n g the other end?" and he replies " N o b o d y ! " and the rubber band snaps into my hand. I did not try to relate this delayed reaction to relaxation times in viscoelastic materials. If I had, the message w o u l d have been lost. Naturally in New Atoms for O l d w e started out as alchemists — unsuccessful ones. In Fact and Fiction we had fun sitting around the office talking about creating a program in w h i c h we w o u l d try to distinguish between facts — experimental observations — and theories devised to explain the facts — w e called these fiction because the laws of physics are creations of the mind, and that's the definition of fiction. W e decided we c o u l d n ' t d o the program for reasons that w o u l d only make sense if you saw the program. As you all k n o w there is a great deal of physics involved in the creation and maintenance of standards, and w e dealt w i t h a lot of it in Standards for Comparison. In Laser Light it was a real challenge to explain what coherent, collimated, and m o n o c h r o m a t i c meant, and it didn't get any easier w h e n w e got to things like m o d u l a t i o n or energy levels. You can probably guess what Lies, Damn Lies, and Statistics was about, more or less. W e didn't want to mess around w i t h the sensitive question of the relationship between cigarette smoking and lung cancer, because we w o u l d have had to have our facts right, so instead w e dealt w i t h the relationship between g u m c h e w i n g and the c o m m o n cold, w h e r e w e c o u l d invent the statistics. This is an example w h e r e a g i m m i c k had another purpose as well as comic relief. W e did a little playlet where w e were interviewed — one of us a g u m addict, the other a reformed addict, and all the pro and con cliches translated perfectly: " H a d an uncle lived to 96 — c h e w e d g u m all his life — of course he never swallowed the j u i c e " and " I d o n ' t believe the animal experiments — h o w d o they get the mice to chew the gum?'" or " Y o u can see t h e m on the way to school — c h e w i n g away like mad — disgusting — the girls are as bad as the boys." W e t h o u g h t this was a real tour de force, and w e did manage to w o r k in some physics. (At this p o i n t showed videotape of first few minutes of "Conservation Laws" in order to illustrate t w o or three points.) I have spent some time indicating the kind of things w e did because I t h o u g h t it important for you to have some idea of the " f l a v o r " of our efforts before I tried to address any questions like " W h o watched?," " W h o benefited?," "Was it worthwhile?," "Whas it educational?" Most of o u r programs were on the national network, so a lot of people watched. Even if the fraction of viewers was small, w e had an o p p o r t u n i t y in every program to talk to several h u n d r e d thousand people, more than we w o u l d reach in a w h o l e lifetime of classroom teaching, so if n o t h i n g else it means w e had to give it " o u r best shot," as ecdysiasts and others might say. A l t h o u g h we didn't consciously think about it, I guess our priorities w e n t like this (Fig. 5): O u r first responsibility was to our subject, physics, and to the scientific c o m m u n i t y . None of our colleagues ever criticized us for getting o u r facts wrong, or even for misrepresenting the 1. PHYSICS & PHYSICISTS — Accuracy? 2. THE UNIVERSITY — Respectability? 3. THE PUBLIC — Acceptability? 4. THE CBC — Responsibility? Fig. 5. Priorities. subject by over-simplifying, and we were very p r o u d of that. M i n d you one colleague did disagree on an historical date — by one year. O u r second responsibility was to the University; w e advertised ourselves as Professors at the University of Toronto, and felt an obligation not to d o anything that w o u l d discredit the institution. Certainly w e did not want to accentuate the oddball professor image, even t h o u g h w e did not take ourselves totally seriously. W h i l e our attempts at h u m o r may sometimes have been a little corny, they were never malicious — the only people we laughed at were ourselves. A n d w e tried very hard not to let the h u m o r interfere w i t h our story line — one viewer called us didactic, and I took that as a c o m p l i m e n t as soon as I f o u n d out what it meant. O u r t h i r d responsibility was to the viewers — the public. Anyone w i l l i n g to watch a half-hour o n physics deserved the best w e c o u l d do. W e w o r k e d very hard to present physics, warts and all, as accurately, as coherently, and as interestingly as w e possibly could. W e were amazed by the enormous variety of people w h o watched — a complete spectrum of ages from 8 to 80, of educational backgrounds, and of vocations. Because of this, even t h o u g h each program had a strong story line w e adopted a buckshot approach, operating at a variety of levels, so that viewers w i t h different backgrounds were given different things to think about. W e tried to include something for everybody — the professional scientist, the humanities graduate, or the interested layman, because we discovered that this worked. About the only criticisms w e had came from professional educators, w h o t o l d us they were not sure what level we were aiming at. W e were very pleased. O u r f o u r t h and last responsibility was to the CBC, the organization e m p l o y i n g us. W h i l e we were delighted to be d o i n g the shows, and to be paid for it, w e t e n d e d not to accept the conventional wisdom of broadcasters. W e were told, for example, that the average viewer was capable of assimilating only X bits of information in a half-hour, w h e r e X was 1 or some other small integer. W e consistently ignored this dictum, packing in as m u c h information as we t h o u g h t was palatable, believing that each viewer might take somet h i n g different f r o m the program, d e p e n d i n g on his or her background, as I said. Another area where w e differed f r o m our media peers had to d o w i t h the use of material p r o d u c e d by others. They were always showing us bits of film that they t h o u g h t w o u l d be just right for us to use. W e never used any. This was of course pure arrogance on our part — w e always t h o u g h t w e could say things better. At least I'm consistent — I never used films in my classroom either, not even PSSC films, not even our PSSC films, although I confess I did once show Frames of Reference d u b b e d in Italian because I wanted to prove that Pat H u m e lip-synched better in Italian than in English. I suppose our relationship w i t h the CBC was a little odd, because we t h o u g h t we were in charge — and w e were. W e totally created the shows — w r o t e the scripts, provided the e q u i p m e n t (borrowed from the University, w i t h our o w n technician to handle it), w o r k e d w i t h the graphic artist to p r o d u c e any diagrams or photographs w e needed, and so on. W e may have been somewhat frustrating for our producers, because naturally a producer wants to produce. W e were fortunate in that we kept being involved w i t h new ones, w h o at least at first were prepared to accept that w e were the experts. Our gradual separation f r o m the CBC took place because of many factors, mainly related to the evolution of television. The time came that they wanted us to do things we were not prepared to do, because they were not consistent w i t h our underlying philosophy. I hope this philosophy, nebulous as it is, has been revealed in what I have said so far today. W e never really sat d o w n and said "This is what we believe, and this is what w e are trying to achieve," but Xa Physique au Canada juillet 1988 105 w e d i d have a few prejudices, as you have seen. W e were not stressing the utility of science, the "better things for better living" approach, although, w h e n appropriate w e w o u l d m e n t i o n applications. W e assiduously avoided the "scientific p r i e s t h o o d " approach, suggesting that if scientists ran the w o r l d everything w o u l d be better, if not perfect. W e talked about atomic energy but not about atomic bombs, not because bombs d o n ' t exist but because w e felt they already had their fair share of publicity. O u r main aim was t o improve public scientific literacy, whatever that means. Back t o the questions. W h o benefited? Certainly at least t w o people did. W e did. W e learned a great deal about our subject, about each other, and about the public. W e had great fun d o i n g the programs, and what's more w e t h o u g h t w e were d o i n g a lot t o improve scientific literacy. In retrospect, I w o n d e r , and I'll c o m e back to this point. It was rather exciting t o be a TV personality, stopped on the street, asked for autographs, invited to address all sorts of groups. Like all professors w e were naturally rather reticent, modest, and retiring, loath to express o u r opinions o n matters outside o u r areas of expertise, but of course as an administrator I had no such hang-ups. Those of y o u in universities may w o n d e r what the effect of such an external activity might be on an academic career. For several years our principal "scholarly activity," apart from o u r teaching, was the presentation of TV programs, and we w o n d e r e d what effect this was having on our "career profiles." W h i l e w e seemed to receive a g o o d deal of favorable publicity f r o m many other sources, our University was almost totally silent. As is often the case, w e appeared to be heros everyw h e r e except at home, and w e suspected that w e were d o o m e d t o be Associate Professors for ever. However, it t u r n e d out that apparently our efforts were noted and approved by somebody, because w e were p r o m o t e d d u r i n g this period. O u r feelings about public reaction were based on some personal contacts of course, but primarily on the mail — bags of mail. W e were surprised and gratified by the very large numbers of viewers w h o w r o t e in about the shows, usually enthusiastically. I used t o take the best letters h o m e for my wife to read, just in case she didn't appreciate what a fine fellow I was. A standard theme of the letters was " I t h o u g h t I was going t o go to my grave not understanding physics, but now, thanks t o you, I d o . " This w o u l d have been very encouraging, except for one thing. W h e n w e w o u l d meet someone personally, he or she w o u l d say something like " I saw y o u o n TV, and I t h o u g h t the show was just great." W e w o u l d say "That's nice, what did you think of the content?" and the reply w o u l d be " Y o u seemed so relaxed and natural, just as t h o u g h you were talking to m e " and w e w o u l d persist "But what did you think of the content?" and get the response " I really enjoy that kind of educational program," and we w o u l d try again " W h a t did you think of the content?" Finally p i n n e d d o w n , perhaps afraid there w o u l d ba a quiz, the viewer w o u l d say " I d i d n ' t understand a w o r d you said." Since w e had w o r k e d very hard to make all the words ones that could be understood, you can appreciate that we f o u n d this a mite discouraging. Presumably what was meant was that they did not understand everything that w e said, but that's not the way it came out. Unfortunately I think this type of response is typical of the way the public reacts t o science — they expect not to understand it. What have w e done to deserve this? W h i l e there are many answers, let me remind you of one, the existense of a highly efficient feedback system in our educational process. Young children, w h e n they are in elementary school and at their most impressionable, make their first contact w i t h science under the guidance of someone w h o 106 Physics in Canada July 1988 is likely to be a typical member of the public as far as science is concerned. Let me emphasize at once that this is not a criticism of elementary school teachers, w h o cannot be expected to be experts on everything. A l t h o u g h I don't think it w o u l d be a bad idea if more exposure to science was a required part of the training of all teachers, I'm not sure this is the answer. Sometimes I think it w o u l d be better if science was treated like a foreign language or music, often handled, at least in Canadian schools, by specialists, while the regular classroom teachers handle the three Rs (which I just realized are actually an R, a W, and an A). Regular teachers often are not expected to deal w i t h French, for example, because even t h o u g h they could cover basic vocabulary and grammar, their accents might not be right. Since I believe that the " a c c e n t " or " f l a v o r " of science is more important than the "facts" of science I w o u l d be happier if science received the same special treatment. Then perhaps the feedback cycle could be broken, and we c o u l d gradually develop a public that c o u l d be described as scientifically literate. I seem to be off topic again — I t o l d you I was an expert on everything. Since I am off topic, I'm going to c o n t i n u e by exposing this captive audience to some of my naive thoughts about education. What do w e mean by education? Different things at different stages of development, I suppose. At some stages, teachers impart facts to students, drill t h e m on these, and test that they have been assimilated — rote learning. As well, physics teachers usually expect students to solve problems; sometimes these are real problems, meaning the students have to think t o solve them, but sometimes they are "type problems," meaning the students solve t h e m by rote because they have seen t h e m before. (Is " t y p e p r o b l e m " an oxymoron?) Is there any point to rote learning in science? Drill in spelling, in grammar, in arithmetic probably makes sense because we all have to speak and write and calculate (although w i t h the advent of pocket calculators, this may be a vanishing skill). Drill in geography and history may make sense because w e all live in the world. But drill in science? Do students really need to know about the habits of the fruit fly, or the properties of chlorine, or even the laws of Newton, to live in the world? It seems to me that the study of science should d o t w o things — assist the students in learning to think, and lead t h e m to an understanding of the nature of science — and I'm not convinced that we d o very well on either of these. O n e reason is that these goals are rather nebulous, and it is difficult, perhaps impossible, to measure whether or not w e are successful. O n e of the tenets of m o d e r n physics is that if something cannot be measured, or ever expect to be measured, then it has no place in o u r theories. Unfortunately, there seems to be a similar principle in education. W e feel obliged to test our students — or the system demands that w e d o — so w e may not feel comfortable about spending time on the unexaminable aspects of our subject. I teach a first year class of about 170 Engineering Science students, I w o u l d guess that I spend at least half of my time talking about things that I regard as unexaminable. I can d o this because I set my o w n exam, but if I was preparing them to w r i t e some sort of external examination, I d o u b t that I w o u l d have the courage to "waste" so m u c h time. M y exam is totally problems, because I am not interested in the rote learning ability of my students — that has already been exhaustively tested. Every once in a while for my o w n interest I put on something in the unexaminable category — for example: "Physics does not deal w i t h reality." C o m m e n t . The quotation was from me — that way you get just what you want in a quotation. There were t w o categories of answers, those that said the statement was true because physics deals w i t h models or idealizations of reality, and those that said the statement was false because physics is based o n measurements in the real world. Everybody got full marks for the question (two marks), including one student w h o said that this was a deep philosophical question w o r t h m u c h more than t w o marks. The p r o b l e m w i t h asking an o p i n i o n is that whatever is said has to be considered correct! Let me get back to o u r programs. W e r e they educational? Certainly not, if by education w e mean imparting useful skills. You only really learn something by d o i n g it, and sitting in front of a TV set makes you an expert — o n sitting. O n the other hand, we do k n o w a few people w h o have stated that our programs influenced t h e m to study physics seriously, t o become physics teachers or other professional scientists — if w e k n o w some, perhaps there are many. Does that mean the programs were educational — or just propaganda? What about the people w h o claimed on the basis of our programs t o at last understand science? I wish I c o u l d say I believe them, but I suspect w e p r o d u c e d not understanding, but the myth of understanding. But does it matter? Certainly to the extent that w e may have influenced a few, perhaps even quite a few, t o dig deeper, to really learn about science, I am happy, and I d o n ' t care if it's called education or not. W e always argued that w e were d o i n g education under the guide of entertainment; one of my problems w i t h the CBC was that I felt they sometimes wanted to d o entertainment under the guise of education, and this difference in attitude is important. A b o u t now you may well be w o n d e r i n g h o w I have the temerity to spend all this time telling you about what w e d i d 30 years ago. O n e reason is that I felt I should talk about something I know about, and that limits me terribly. W h a t is more, w h i l e the pace of change in technology is enormous, the pace of change in human institutions like education is notoriously slow, and I hope that some of the lessons w e learned in the dark ages of TV still have some relevance. Some of these have been obvious in what I have said, others are subliminal. If I try t o pull this p o t p o u r r i of random thoughts together, perhaps what I am trying to say is this. Programs of the kind w e d i d help t o provide something that the regular school system often does not — the unexaminable part, the part that many teachers may not f i n d the time for. So of course I believe that everyone should be exposed to this kind of experience, as part of the educational process. But can w e arrange this? W e were very fortunate to be allowed to d o what w e d i d o n national television, and I d o u b t that it c o u l d happen today. This is an age of experts, and the media experts have taken over — the ones w h o I think underestimate public intelligence, w h o think the public attention span 3 min, max. All public affairs programs t e n d to be in a magazine format, w i t h a snippet of this, and a tad of that, and it is most unusual t o f i n d a w h o l e half-hour devoted to developing a theme. There are t w o problems about my suggestion that everyone should be exposed to this kind of knowledge — integrating experience — one is that such programs are unlikely to be shown at all and that second is, even if they are, w i t h so many other commercial programs to choose from now, w i l l anyone watch? In o u r free society, are we likely to f i n d people o p t i n g for things w e think are good for them? Mostly the answer is emphatically NO. There are of course many examples of successful c o n t i n u i n g education projects, but the goals of these are usually specific — they are designed to assist people in i m p r o v i n g their performance and enhancing their career opportunities. There are projects like The Mechanical Universe series, w h i c h are broadly educational, but my fear is that those w h o are most likely to watch are those w h o need to least. H o w do w e get at the silent majority? I am pessimistic about the possibilities of markedly increasing public scientific literacy t h r o u g h the m e d i u m of optional TV. This leads me to argue that w e must try to do better t h r o u g h the educational system, where w e d o have all the people as a more or less captive audience. This is precisely the business that AAPT is in — improving physics education. You mostly agree that there is r o o m for improvement, and are w o r k i n g hard on a variety of fronts to achieve this. W i t h m o d e r n technology there is n o w the possibility of using easily the kind of material I have been talking about in the classroom — on tape, disk, or film. Many teachers expressed a desire to use our programs as films for their classes, but the CBC w o u l d not allow this — they were not in the film business, and of course the quality of kinescopes was not something to be p r o u d of. But now the situation is totally different. Various agencies are p r o d u c i n g material for use in classes. In Ontario our public system TV Ontario provides material in a variety of ways — some of it very good, and some not so good. I confess to being horrified by some of the material prepared for physics education — not by the technical quality, w h i c h was superb, but the scientific quality. It was not that the facts were wrong, but that the accent was wrong. So one plea I make is that all of us must not allow to go unchallenged material w i t h the w r o n g accent, the w r o n g flavor. If I was a teacher in a school, w o u l d I use material that might help enhance the scientific understanding of my students, but w o u l d not necessarily assist them in passing the tests or examinations set by me or someone else? That is a very difficult question, one that I refuse to answer on the grounds that my time is nearly up, and I want to c o n c l u d e by showing you another segment. A n d finally, if you are unhappy about my presentation here today, d o n ' t blame me — blame them. I t o l d you the Awards C o m m i t t e e made a mistake. Xa Physique au Canada juillet 1988 107 Without a Past does Canada have a Future in Physics? /. William McCowan Past Director National Museum of Science and Technology The f o l l o w i n g article is based u p o n addresses given at the University of Toronto, Carleton University, Ottawa, and the meeting of the Division of Atomic and Molecular Physics, CAP, Fredericton, N.B. Ed. It is my thesis, borne out of my experience as the Director of the National M u s e u m of Science and Technology, that Canadians have little knowledge of, nor pride in, the technological accomplishments that have o c c u r e d in our country t h r o u g h the hard w o r k and dedication of Canadian scientists. Extrapolating f r o m this thesis, Canadians are not aware of the significant contributions physicists have made to the advancement of technology in Canada. There are few countries in the w o r l d that d e p e n d more critically u p o n technology and its supporting sciences than does Canada. The vastness of the land alone demands a superior telecommunications system. Yet, there is no country to my knowledge w h i c h downplays its scientific accomplishments and role in the development of technology more completely than w e d o — h o w Canadian! Ask any Canadian about our hockey heroes, capitals of our provinces or the states of the United States, or movie personalities — more likely than not they will be able to list most of them. But, ask about our Nobel Prize winners, of w h i c h Canada has t w o still living, Gerhard Herzberg and John Polanyi, both chemical physicists; about our involvement in the development of communications satellites t h r o u g h the visionary w o r k of Dr. John H. Chapman, w h o is n o w recognized as the father of the Canadian space program; about Reginald Aubrey Fessenden, a Canadian w h o was the inventor of radio and was the first to broadcast voice, but w h o f o u n d no support then, or recognition now, for his w o r k so that credit is given t o Marconi; and about physicist Hugh Lecaine, father of m u c h of our m o d e r n day electronic music and w h o , w i t h Paul Redhead of the National Research Council, built the first M i c r o t r o n Electron Accelerator, and I can assure you that the response t o questions of this nature will be poor. Few people k n o w of the accomplishments of these outstanding Canadians. These people are part of a rich heritage which, if recognized by Canadians, w o u l d clearly identify for them the leadership many of our forefathers provided in some areas of science and technology not only w i t h i n our country but around the w o r l d . O n l y a handful of Canadians ever knew, or cared, about TRIUMF, or TASCC, or the Canada-France-Hawaii infrared telescope, or the potential of INC, or the Canadian long baseline array, or the Canadian Synchrotron Radiation Facility in Madison, Wisconsin, or of the proposed Canadian Microelectronics Corporation Laboratory. In addition, very few Canadians knows about the early developments of oil in this country, our role in the developments of nuclear spectroscopy, the role Canadian physicists have played in developing nuclear medicine and are playing today in the development of medical scanners. Furthermore, the d e v e l o p m e n t of nuclear power, the Canadian a u t o m o b i l e industry, and the development of the hydrofoil remain a mystery t o many Canadians. W e can also add to this list Frank's flight suit, high lasers, the High Altitude Research Project (HARP) often referred t o as the "Bull Shoot" after Dr. Jerry his program at M c G i l l University, and the early 108 Physics in Canada July 1988 powered w h i c h is Bull and days in biotechnology. You will find that Canadians are virtually out of t o u c h w i t h these things many of w h i c h affect their daily lives. What are the factors that have c o n t r i b u t e d t o this lack of awareness, and for that matter, lack of respect for the major accomplishments w h i c h our Canadian physicists have pioneered? Some time ago I took h o m e f r o m our research library at the National Museum of Science and Technology, 15 years of Physics in Canada, five years of Physics Today and all the books the librarian could find that covered Canada's past in physics. I was not really surprised w i t h what I found. There were only a few books on the history of the National Research Council, something o n Rutherford at McGill, and very little o n the development of nuclear power from Rutherford t h r o u g h to the Candu Reactor, w h i c h I maintain is the world's finest reactor system. There were also some references to low temperature physics at Toronto, and the commemorative volume for Herzberg, but I f o u n d little on our great accomplishments in medical physics or atmospheric physics. I was aslo extremely disappointed by the lack of material w h i c h appeared in Physics in Canada and the near total lack of reference to Canadian physicists and their accomplishments in Physics Today. Turning up inadequate information in the literature, I began to w o n d e r where I had learned of Canadian accomplishments. Though I have never thought of it before, it occurred to me that most of what I know I have learned f r o m colleagues abroad, people w h o were NRC fellows, and Canadians w h o m I have w o r k e d w i t h at Westinghouse in Pittsburgh, General A t o m i c in San Diego, friends and Colleagues in Stanford, Wisconsin and Hamburg, Germany where w e carried out our synchrotron radiation experiments and others I have w o r k e d w i t h in places as far away as Namur and Louvain in Belgium, Madras and New Delhi in India and Bariloche in Argentina. Stories of good Canadian science and excellent scientists a b o u n d abroad but are too seldom referred to at home. The way in w h i c h w e present Canada to the rest of the w o r l d also has an impact on the way Canadians see themselves. For example, I visited the Canadian pavilion at Expo '85 in Tsukuba, Japan. It was beautiful to behold, but w e presented Canada in low tech films — not in a Canadian made Imax of O m n i m a x theatre — as a vast land w i t h prairies and oceans, and as a land of beautiful mountains w i t h Indians and Eskimos. The Japanese, in contrast, emphasized everywhere the importance of fundamental science as a necessary ingredient of their rapid technological growth. Unfortunately, I f o u n d the situation at our Expo '86 only a little better. A l t h o u g h w e did an excelllent j o b of entertaining 22 million people in Vancouver, I found, as a scientist and a person c o m m i t t e d to publicizing of the good scientific research in Canada and how it has led to excellent technological development — that w e again undersold ourselves. W e missed our greatest o p p o r t u n i t y to bring the best of Canadian science and technology to a large segment of society and to many others abroad. No w o n d e r the ministers of government find it difficult to maintain meaningful science policy in Canada. The lack of support from the government has, historically, plagued the public awareness of science and technology in Canada. The few dollars MOSST has set aside to bring REPORT ON ACTIVITIES COMPTE-RENDU 1987-1988 # CANADIAN ASSOCIATION OF PHYSICISTS ASSOCIATION CANADIENNE DES PHYSICIENS JUNE/JUIN 1988 TABLE OF CONTENTS PRESIDENTS'S REPORT 1. 2. 3. 4. 5. 6. 7. 8. PAGE COUNCIL, DIVISIONS AND COMMITTEES 1.1 Executive and Council 1.2 Division Executives 1.3 Committees and Representatives to other Organizations 2 2 3 SUBJECT DIVISIONS 2.1 Division of Aeronomy and Space Physics 2.2 Division of Atomic and Molecular Physics 2.3 Canadian Geophysical Union 2.4 Division of Condensed Matter Physics 2.5 Division de physique medicale et biologique 2.6 Division of nuclear Physics 2.7 Division de physique optique 2.8 Division of Particle Physics 2.9 Division of Physics Education 2.10 Division de physique des plasmas 2.11 Division of Theoretical Physics 2.12 Division of Industrial and Applied Physics 2.13 Division of Surface Science 4 4 5 5 5 5 5 6 6 7 7 8 8 MEMBERSHIP 3.1 Categories of Membership in CAP 3.2 Membership Campaign 3.3 Current Membership 8 8 9 CORPORATE MEMBERSHIP 4.1 Corporate Members' Meeting 4.2 Current Corporate Membership 9 9 EDUCATIONAL ACTIVITIES 5.1 Educational Trust Fund 5.2 The CAP Lecture tours 5.3 CAP University Prize Examination 5.4 The Undergraduate Physics Conference 5.5 Youth Science Foundation and Canada-Wide Science Fair 5.6 CAP Secondary School Physics Prize Examination 5.7 Table 10 11 11 MEETINGS AND SUMMER SCHOOLS 6.1 Annual Congress 12 PUBLICATIONS 7.1 Canadian Journal of Physics 7.2 PhysiC3 in Canada 7.3 Journal Subscriptions 12 13 13 10 10 10 10 OTHER ACTIVITIES 8.1 Science Policy Committee 8.2 Phy3ic3 and Society 8.3 Honorary Advisory Council of Past Presidents 8.4 Employment Opportunities Committee 8.5 Committee of University Physics Department Heads and Chairmen 8.6 The Directory of Canadian Physicists 8.7 Committee on Professionalism 8.8 Committee to Encourage Women in Physics 8.9 Committee on Undergraduate Student Affairs 8.10 Radiation Regulations Committee 8.11 Sub-Committee of the Executive on Finance 13 13 14 14 15 15 15 9. AWARDS COMMITTEE 15 10. REPORTS FROM REPRESENTATIVES TO OTHER ORGANIZATIONS 10.1 CNC/International Union of Crystallography 10.2 Technical Advisory Committee to AECL on the Nuclear Fuel Waste Management Program 11. GROUP LIFE INSURANCE 12. NEW EXECUTIVE AND COUNCIL: 13 13 13 13 15 15 16 1988-89 17 PRESIDENT'S REPORT All departments of our Association have had good programs this year, and their work demonstrates the scope of our activities. Divisional reports are given elsewhere. The Fall topical meetings have continued to be attractive and, for example, the DCMP meeting on high temperature superconductors was an exciting, well attended meeting and will be repeated next year. Our Committees have continued to work on many technical issues. The Education Division, for example, has a joint committee with the AAPT and STAO in Ontario working on matters connected with the physics teaching and liaison with teachers. The Council has discussed the reinstatement of local sections which would encourage members from all parts of physics to meet together. The Science Policy Committee has finalised its initial agenda and its report "Physics in Canada: A Brief Survey and Outlook" was published in the March issue of Physics in Canada. It is our first piece of publicity work. The Corporate Members held a successful meeting on "Centres of Excellence" in April which was attended by 90 people from Government, Industry and Universities. A Directory of Employers of Physicists is nearing completion. DIAP held a successful meeting on "Sensors Technology" in May, attended by 65 people from Industry, Universities and Government Laboratories. Both these meetings have had an excellent impact on the scientific community. Our annual congresses in 1987 and 1988 have been marked by high attendance figures and the high quality of the presentations. Overall our Association is showing both vigour and maturity, and is serving the Physics Community well. In spite of the excellent work being done and the numerous activities of our Association, the membership is steadily falling year by year. In 1978 the membership peaked at 1941 and has fallen each year, until in this report a figure of 1587 is given. The number of members recruited each year has been somewhat less than those who do not renew their membership. Along with this fall in numbers, there has been a fall in revenue and we are begining to run deficits on each year's operations. Because of the healthy condition of our reserves this does not create an immediate problem, but the situation must be changed as quickly as possible. The Council has decided to run a new membership campaign in which all members will be asked to participate. Each member will receive a package of material explaining how he/she can help and providing suggestions and publicity materials. Members will be asked to work with their friends to turn this problem around. Council is also planning another membership drive to increase the number of corporate members, and we hope that these two steps will produce results during the next year or so. It has been a pleasure to work with our Executive and Council during the past year and I wish to thank them for their cooperation and devoted efforts. The central office staff are devoted to our association and I thank them for their cooperation also, which makes the work of our association so straightforward. I have enjoyed working with them, and we all owe them our gratitude. P.A. Egelstaff President CAP Council and Division Executives 1987-88 1.1 1987-88 Council President, P.A. Egelstaff", University of Cuelph Past President, J.S.C. McKee*, University of Manitoba Vice-President, L.C. Caron*, Université de Sherbrooke Vice-President Elect, A.A. Offenberger*, Univesity of Alberta Honorary Secretary-Treasurer, R.L. Clarke*, Carleton University Director — Full Members, ). Vanier, Conseil National de Recherches Director — Affiliate Members, T.W. East, Self Employed Director — Student Members, T. Haglund, University of Calgary Director — Corporate Members, J.W.Y. Lit,Wilfrid Laurier University Division Chairmen Aeronomy & Space Physics, J.C. Samson, University of Alberta Atomic & Molecular Physics, E.H. Pinnington, University of Alberta Canadian Geographical Union, P. Vanicek, University of New Brunswick Condensed Matter Physics, J. Franck, University of Alberta Medical and Biological Physics, R.L. Carrier, Hôpital Notre Dame Nuclear Physics, P. Taras, Université de Montréal Optical Physics, P.A. Belanger, Université Laval Particle Physics, H.C. Lee, Chalk River Nuclear Laboratories Physics Education, I.K. Dean, George Brown College Plasma Physics, B. Stansfield, Université du Québec Theoretical Physics, C. Leibbrandt, University of Cuelph Industrial and Applied Physics, C.H. Mackenzie, TRIUMF Surface Science, D.C. Frost, University of British Columbia Councillors/Conseillers British Columbia C. Jones, (1) University of British Columbia D. Boal, (2) Simon Fraser University Alberta D. Venkatesan, (1) University of Calgary W.C. Olsen, (2) University of Alberta Saskatchewan and Manitoba G. Kunstatter, (1) University of Winnipeg G.J. Lolos, (2) University of Regina Ontario — Southwest J.A. Kuehner, (1) McMaster University G.W.F. Drake, (2) University of Windsor Ontario — Central and North E.D. Hallman, (1) Laurentian University D.C. Bailey, (2) University of Toronto Ontario — East P. Bernard, (1) Université d'Ottawa B.K. Mukherjee, (2) Royal Military College, Kingston Québec — Nort et Ouest D.S. Hanna, (1) McCill University A. Yelon, (2) École Polytechnique Québec — Sud et Est L. Lamarre, (1) Hydro Québec — IREQ M. Piché, (2) Université Laval New Brunswick & Newfoundland F. Girouard, (1) Université de Moncton D.H. Rendell, (2) Memorial University Nova Scotia and Prince Edward Island C. MacLatchy, (1) Acadia University G. Stroink, (2) Dalhousie University At Large P. Kirkby, (1) Ontario Hydro H. Buijs, (2) Bomem Inc. Editor — Canadian Journal of Physics: R. Nicholls, York University Editor — Physics in Canada/La Physique au Canada: J. Rolfe, Bank of Canada, Ottawa Executive Secretary — Secretaire Exécutif: M.L. Jento •Member of Executive Committee (1) Term ends June 1988 (2) Term ends June 1989 1.2 Division Executives 1. Division of Aeronomy & Space Physics J.C. Samson, Chairman, University of Alberta R.P. Lowe, Past-Chairman, University of Western Ontario H.G. James, Vice-Chairman, Communications Research Centre R.A. Koehler, Secretary-Treasurer, York University 2. Division of Atomic & Molecular Physics E.H. Pinnington, Chairman, University of Alberta R.M. Lees, Past-Chairman, University of New Brunswick F.W. Dalby, Vice-Chairman, University of British Columbia Y.N. Joshi, Secretary-Treasurer, St. Francis Xavier University 3. Canadian Geophysical Union P. Vanicek, President, University of New Brunswick D.J. Dunlop, Past-President, University of Toronto D.E. Smylie, Vice-President, York University P.A. Camfield, Secretary-Treasurer, Geological Survey of Canada R.M. Farquhar, Newsletter Ed., University of Toronto 4. Division of Condensed Matter Physics J. Franck, Chairman, University of Alberta A.H. MacDonald, Past-Chairman, Indiana University G. Williams, Vice-Chairman, University of Manitoba B. Southern, Secretary-Treasurer, University of Manitoba 5. Division of Medical and Biological Physics R.L. Carrier, Chairman, Hôpital Notre Dame ).J. Battista, Past-Chairman, Cross Cancer Institute R.M. Henkelman, Vice-Chairman, Ontario Cancer Institute S. Connors, Secretary-Treasurer, Cross Cancer Institute W. Huda, Councillor 6. Division of Nuclear Physics P. Taras, Chairman,Université de Montréal W.P. Alford, Past-Chairman, University of Western Ontario E. Mathie, Vice-Chairman, University of Regina 7. Division of Optical Physics P.A. Belanger, Chairman, Université Laval K.O. Hill, Past-Chairman, Communications Research Centre J.W.Y. Lit, Vice-Chairman, Wilfrid Laurier University R.A. Lessard, Secretary-Treasurer, Université Laval 8. Division of Particle Physics H.C. Lee, Chairman, Chalk River Nuclear Laboratories R.J. Hemingway, Past-Chairman, Carleton University R. Orr, Vice-Chairman, University of Toronto J. Trischuk, Secretary-Treasurer, McGill University 9. Division of Physics Education I.K. Dean, Chairman, George Brown College G. Faucher, Past-Chairman, École Polytechnique B. Mukherjee, Vice-Chairman, Royal Military College A. Biffi, Secretary-Treasurer, College Militaire Royal de SaintJean F. Girouard, Councillor, Université de Moncton P. Kirkby, Councillor, Ontario Hydro 10. Division of Plasma Physics B. Stansfield, Chairman, Université du Québec J. Meyer, Past-Chairman, University of British Columbia A. Ng, University of British Columbia C. Boucher, Université du Québec 11. Division of Theoretical Physics G. Leibbrandt, Chairman, University of Cuelph R. Taylor, Past-Chairman, National Reserch Council D. Pink, Vice-Chairman, St. Francis Xavier University W.J. Romo, Secretary-Treasurer, Carleton University 12. Division of Industrial and Applied Physics G.H. Mackenzie, Chairman, TRIUMF J. Judah, Past-Chairman, Ontario Hydro B. Paton, Vice-Chairman, Dalhousie University J.F. Bussière, Secretary-Treasurer, NRC, Boucherville, P.Q. 13. Division of Surface Science (Joint with C.I.C.) D.C. Frost, Chairman, University of British Columbia D.R. Salahub, Past-Chairman, Université de Montréal R. Tapping, Vice-Chairman, Chalk River Nuclear Laboratories T.E. Jackman, Secretary-Treasurer, National Research Council 1.3 1987-88 COMMITTEES AND REPRESENTATIVES TO OTHER ORGANIZATIONS STANDING COMMITTEES 1. Science Policy J.S.C. McKee (c) L.C. Caron A.I. Carswell 2. Editorial Board J. Rolfe, Editor M.L. Jento J.P. Svenne 3. Publications R.W. Nicholls (c) D.D. Betts W.R. Datars C. Delisle PA. Forsyth R.R. Haering 4. Membership R.L. Clarke (c) M.L. jento C. Dolling P.A. Egelstaff Physics in Canada J.G. Cook G. Dolling B. Joos G. Herzberg G.W.F. Drake W. Israel B.K. Jennings B.P. Stoicheff T.W. Johnston B. Margolis P. Kitching P. Kirkby ).A. Nilson J .A. Nilson R.H. Packwood R. Roy A.V. Jones B. Joos J.A. Coxon P. Marmet W.P. Alford P.R. Wallace G. Rostoker J. Vanier A. Okazaki H.E. Duckworth E.R. Pounder G.M. Volkoff G.G. Cloutier A.T. Stewart A.H. Morrish G.C. Hanna A.I. Carswell 14. Teller Committee Members to be appointed by the Executive when required 15. Committee of University Physics Department Heads J.E. Hardy D. Murty M.B. Walker (c) R. Harris-Love S.I.H. Naqvi M.R. Anderson D. Hunter E. Auld C.A. Plint J.C. Irwin R.C. Barber J. Reed S. jandl R. Bishop D.H. Rendell K. Jeffrey J.A. Blackburn G. Rose C. Bland C. Kalman G. Rubin I. Cameron W.J. Keeler M. Schlesinger G.L. Cumming D. Kraul A. Schultz C. Demers R.M. Lees A. Slavin J.R. Derome H.M. Love R. Slobodrian M.G. Faucher M. Madan R.C. Smith A. Filion B. Marinier M. Suquet D.J.W. Geldart S.K. Mark P.G. Sutherland F. Girouard J.H. Matthews E. Tomchuk R.A. Giles W.J. Megaw B.C. Rurrell J. Grindlay R. Montalbetti J.T. Weaver 16. Employment Opportunities 5. Awards M.P. Bachynski (c) W. Israel 6. Annual Congress L.G. Caron (c) J.G. Samson E.H. Pinnington P. Vanicek J. Franck M.R. Carrier R.R. Haering P.A. Egelstaff - Program P. Taras P.A. Belanger H.C. Lee I.K. Dean B. Stansfield C.C. Costain G. Liebbrandt G.H. Mackenzie D.C. Frost G. Beaudet M.L. Jento 7. Annual Congress — Local Committee G. Beaudet (c) M.L. Jento with power to add M. Bergevin with power to add 9. Nominating J.S.C. McKee (c) P.A. Egelstaff A.A. Offenberger with power to add 10. Membership Campaign A.A. Offenberger (c) G.W.F. Drake G. Jones D.G. Hallman D. Boal D.C. Bailey D. Venkatesan P. Bernard B.K. Mukherjee W.C. Olsen D.S. Hanna G. Kunstater A. Yelon G.J. Lolos J.A. Kuehner L. Lamarre 11. Corporate Members G.H. MacKenzie B. Paton J. Lit (c) J. Judah with power to add 17. Directory of Canadian Physicists D.S. Hanna M.L. Jento W.J.L. Buyers with power to add 18. Professionalism P. Kirkby (c) B. Ahlborn K.E. Breitman F.J. Morgan I. Vanier M.J. Bronskill C.S. MacLatchy 19. To Encourage Women in Physics A. McMillan (c) M.L. Jento I. Buckiewicz W.J. Megaw M.A. Jenkins 8. Secondary School Physics Examination V.S. Rao (c) L.G. Caron (c) M.L. Jento R. Petrovich J.D. Prentice 20. Undergraduate Affairs E.D. Hallman (c) T. Haglund L.G. Caron with power to add 21. Radiation Regulations G.W. Douglas (c) W. Huda J. Robins C.W. Webber M. Piché F. Girouard D.H. Rendell C. MacLatchy G. Stroink P Kirkby H. Buijs J. Vanier J.F. Bussière 12. Physics and Society T.W. Johnston (c) with power to add 13. Honorary Advisory Council of Past Presidents R.J.A. Levesque L. Katz J.S. McKee (c) H.E. Johns P. Lorrain D.C. Rose R.R. Haering R.E. Bell J.S. Marshall P.A. Forsyth J.M. Robson A.D. Misener C.C. Costain H.E. Petch G.C. Laurence P. Marmet M.P. Bachynski J.L. Kerwin D.D. Betts A.R. Crawford B.W. Sargent E.W. Vogt G. Herzberg B.P. Stoicheff Ad Hoc Committee Finance Sub Committee of the Executive R.L. Clark (c) ).E. Hardy M.L. Jento power to add one Official CAP Delegates to other Organizations 1. Canadian Committee for IUPAP A. Caillé M. Jericho H.M. Skarsgard 2. Youth Science Foundation M.A.R. LeBlanc 3. International Organization for Medical Physics R.L. Clarke M. Cohen 4. Canadian Commission for UNESCO B.K. Mukherjee 5. CNC/lnternational Union of Crystallography B. Powell 6. Technical Advisory Committee to A.E.C.L. on Nuclear Fuel Waste Management M.H.L. Pryce C.W. Volkoff Educational Trust Fund Trustees D. Betts G.C. Hanna W.A. Pieczonka 4 2. SUBJECT DIVISIONS The activities of the Subject Divisions are an important part of the affairs of the Association. The reports from our thirteen Divisions are summarized below. The officers of the Divisions are listed in Section 1.2. The membership figures are given in the Annual Report p.3. Division of Aeronomy and Space Physics 2.1 This year has been a period of waiting for many members of DASP. We still wait for the final word on a Space Agency for Canada, and look with interest to the participation of Canadian scientists in programs for the Space Shuttle and the Space Station to be constructed by the United States. The Standing Committee on Research, Science and Technology, which was given a mandate to study Canada's science and technology policy, with special reference to the Space program, submitted it's third report "Canada's Space Program: A Voyage to the Future" in June, 1987. The DASP Community contributed to a brief entitled "The Canadian Space Program" which was submitted to the standing committee on April 30, 1987. This brief seems to have had some tangible effects on the committee as many of their recommendations were in line with material in that brief. Some of the more important recommendations (for the scientific community) are based on the observation "that a substantial increase in funding for space science is needed if Canada is to be able to participate effectively in international space projects of the future". In the committee's report, the DASP brief was quoted directly in order to emphasize the relevance of these observations. The award for the best student paper in the DASP session of the CAP Congress in Toronto (1987) was won by Mr. E. R. Donovan from the Department of Physics, University of Western Ontario. No award will be given this year because of the limited number of papers submitted to the DASP session of the Congress. While the DASP component of the CAP Congress in Toronto was well attended, the situation does not look as bright for the Montréal Congress. Only four contributed papers are scheduled for the DASP session. This limited number of presentations gives some reason for concern, and suggests that the DASP community must look at methods to generate interest in its own scientific meetings. No DASP winter workshop was scheduled this year. 2.2 Division of Atomic and Molecular Physics Following the custom of recent years, the Divisional activities during 1987-88 centred on the C.A.P, Congress and the Annual Fall Meeting. The Division organized four sessions at the 1987 C.A.P. Congress in Toronto, beginning with the D.A.M.P. Symposium on the Monday morning, which featured excellent talks by S.R. Lundeen, H.G. Berry, P.R. Bunker and J. Reid/K. Siemsen on a variety of topics in atomic and molecular physics. It was perhaps unfortunate that the beginning of this Symposium coincided with the Toronto morning rush-hour, with the consequence that many members missed some of the first-class presentation by S.R. Lundeen. It is hoped that such occurrences can be avoided in the future. In addition to the Symposium of invited talks, three sessions of contributed papers were held, two for poster papers (16 papers in total) and one for oral presentations (5 papers). The Annual General Meeting was also held during the Congress, at which the 1987-88 Executive was elected, consisting of Eric Pinnington of the University of Alberta as chairman and Bill Dalby of the University of British Columbia as Vice-chairman, with Yogi Joshi of St. Francis Xavier University completing his term as Secretary/Treasurer and Ron Lees of the University of New Brunswick becoming Past-Chairman. The 1987 Annual Fall Meeting was held at the University of New Brunswick during October 23-24, with about 50 members in attendance. The Meeting was a great success. It began with a talk by our own Nobel Laureate, Dr. Gerhard Herzberg, followed by nine other invited talks by T.F. Gallagher, P. Lambropoulos, R.D. Verma, R.M. Field, F. Grein, E. Herbst, K.K. Innés, J.W.C. Johns and H. Kiefte. There was also an excellent poster session containing 29 contributions. Other memorable events included a generous portion of "vintage" Bill McGowan as the afterdinner speaker and a demonstration of western initiative by Bill Dalby, who dealt with the problem of a locked door in truly striking fashion. Naturally, the staging of such an ambitious program has financial implications. It was decided at the Business Meeting to increase the annual fee to $10 to permit a greater level of support for such meetings in the future. Planning for the 1988 C.A.P. Congress in Montréal was complicated by the unexpected announcement by the C.A.P. Office that is was to be a joint meeting with the A.P.S. and would involve participation by D.A.M.O.P. Dr. David Golden of North Texas State University has generously organized a Symposium entitled "Electron-Ion and Electron-Atom Interactions", which will feature invited talks by G.H. Dunn, P.F. Dittner, R.A. Phaneuf and J.W. McConkey. The regular D.A.M.P. Symposium on Atomic and Molecular Physics will consist of invited talks by A. Van Wijngaarden, A. Dalgarno, B.P. Stoicheff and R.M. Lees. In addition, there will be one session of contributed oral papers and one of contributed posters. Looking to the future, the 1988 Annual Fall Meeting will be held at N.R.C., Ottawa, on November 4-5, while the long-awaited Joint Meeting with the A.P.S. Division of Atomic, Molecular and Optical PhysiC3 will be held at the University of Windsor on May 17-19, 1989. Since that meeting will be followed almost immediately by the 1989 C.A.P. Congress at the University of Guelph, it has been decided that the May meeting in Windsor will replace the usual Annual Fall Meeting for 1989. Certainly 1988-99 promises to be an exceptionally active and interesting year for the Division. Canadian Geophysical Union The CGU, with a current membership of just over 300, decided not to hold its own scientific meeting in 1987 in order to encourage Canadian attendance at the XIX General Assembly of the International Union of Geodesy and Geophysics. At the Assembly, in Vancouver in August, Canadian participation was evident in the scientific sessions sponsored by the constituent associations of interest to CGU members: geodesy, seismology and physics of the Earth's interior, geomagnetism and agronomy, and that on the lithosphere. The Union held its annual general meeting and banquet during the Assembly. At the latter, attended by about 50 members, the Union awarded its J. Tuzo Wilson Medal to David W. Strangway, now president of the University of British Columbia, in recognition of his outstanding contribution to Canadian geophysics. In his acceptance, Dr. Strangway sketched the evolution of Dr. Wilson's thinking about the Earth; he drew attention the important attributes (openmindedness, continuous re-evaluation of ideas, and ability to change one's mind) that exemplify Dr. Wilson's career. At the annual general meeting, attended by 25 members, discussion focussed on the relationship between CGU and its parent organizations, the Geological Association of Canada (GAC) and the Canadian Association of Physicists (CAP). The members present endorsed the negotiations undertaken by the executive to establish the Union as an independent society, able to set its own criteria for membership but affiliated closely with other scientific societies. In November, the GAC Council for its part approved the dissolution of the GAC division joint with CAP entitled Canadian Geophysical Union and moved to establish in its place its own Geophysical Division whose affairs will in practice be run by a newly-constituted CGU. Negotiations have been started with CAP in search of similar approval from you, our other parent. The CGU executive is planning a number of initiatives to enhance the visibility of the new Union and to place it on a firm footing - a Founding Members program, a membership drive among Canadian members of the American Geophysical Union, an offer of associate membership in CGU to members of the Canadian Meterological and Oceanographic Society, etc. The term of office in 1987 and 1989. of the present CGU executive covers the period between the annual meetings Division of Condensed Matter Physics See report p.110 of Physics in Canada, July 1988. Division de physique medicale et biologique L'année précédente avait été une année préparatoire à la réorganisation de la physique médicale au Canada. Cette année les discussions se sont poursuivies à l'Exécutif, à l'assemblée générale des membres, et aussi, aux réunions du Bureau du Collège des Physiciens en Médecine. De3 opinions variées ont paru dans le Newsletter de la Division et des commentaires ont été sollicités de toutes parts. Un comité de 10 physiciens médicaux s'est finalement réuni en avril dernier réunissant l'Exécutif de la DMBP et le Board du Collège. Un accord fortement majoritaire est alors intervenu. Cet accord vise à la formation d'une organisation unique et autonome de physique médicale qu'on désignera COMP pour "Candian Organisation of Medical Physicist". Cette organisation gérera toutes les affaires de la physique médicale au Canada à l'exception de la certification qui demeurera l'activité unique du Collège des Physiciens en Médecine (CCPM). Il est certain que les physiciens médicaux adhéreront en tout premier lieu à la COMP et qu'ainsi la DMBP souffrira d'un problème sérieux de membership. Sans dissoudre la DMBP le prochain Exécutif devra se donner un mandat trè3 simple, c'est-à-dire celui d'assurer la liaison entre COMP et CAP Au-delà de ces discussions, il y a eu de membreuses activités courantes au niveau des comités, notamment : (1) la préparation d'un questionnaire sur la rémunération, pour répéter un inventaire; (2) la formation d'un groupe d'étude sur l'enseignement Radiologie, Radio-oncologie et Médecine nucléaire; de la physique aux résidents en (3) les échanges d'idées avec l'Association Canadienne de Radiologie, l'Association Canadienne des Radio-oncologues, l'Association Canadienne d'ingénieurs biomédicaux, et l'Association Américaine des Physiciens en Médecine. Bref, une année très active dont le bilan final sera certainement critiqué néanmoins à la communauté de physique médicale un meilleur avenir. mais qui assure Division of Nuclear Physics No report received. Division de physique optique Aucune activité spéciale n'a été tunue cette année. thématiques ont été organisées par l'exécutif: applications industrielles de l'optique. Pour le congrès de Montréal trois sessions les impulsions femtosecondes et les L'exécutif a consacré ses efforts à l'élaboration d'une stratégie de recrutement de nouveaux membres. A cette fin nous avons dressé la liste complète de tous les membres canadiens des associations scientifiques américaines liées au domaine de l'optique et des lasers soit: Optical Society of America Laser Institute of America (OSA), Lasers and Electro-optics Society (LEOS-IEEE), (LIA), et International Society of Optical Engineering (SPIE) 6 De plus cette liste comprend tous les membres du répertiore des physiciens canadiens (CAP) et du bottin de la recherche (ACFAS) qui ont indiqué que leurs activités principales étaient du domaine de l'optique. Cette liste a été complétée récemment grâce à la collaboration de l'Institut national d'optique qui a fourni les services de secrétariat. Nous avons maintenant le nom et l'adresse de prè3 de 800 scientifiques qui oeuvrent au Canada dans le vaste domaine de l'optique et des lasers. le vice-président élu, M. John Lit, disposera cette année de toutes les information nécessaires pour poursuivre cette compagne de recrutement. On espère si le nombre de membres de notre division devient suffisant (environ 100 actuellement) pouvoir tenir des activités dans certaines régions du pays plus régulièrement. 2.8 Division of Particle Physics As in past years the affairs of the Particle Physics Particle Physics have been closely connected. Division of CAP and the Institute of NSERC continues to give firm support to the three large international projects with strong Canadian contingents: the OPAL project for the LEP facility at CERN, the ZEUS project for the HERA facility at DESY and the SLD project for the SLC facility at SLAC. At the same time, the medium projects that are being replaced by the big three are producing rich crops of analyzed data, including results on B-meson physics by the ARGUS group (DESY), photon physics by the Tagged Photon group (Fermilab), p-nucleus collisions by the HELIOS group (CERN), and harmonium physics from the E-705 group (Fermilab). A new and massive initiative is the proposal to establish the Sudbury Neutrino Observatory (SNO), which is currently under study by NSERC. The facility, if built, will have a dramatic impact, among other things, on the "solar neutrino problem". Members interested in the proposal should contact G. Ewan of Queen's University. TRIUMF's funding campaign for the KAON Factory is proceeding well. Already the proposal Is strongly backed by the B.C. government with a pledge of $87 M and has obtained a substantial monetary commitment from the Federal Republic of Germany. Belgium, China, Israel and U.K. have also expressed interest in participating in the project. Proponents are optimistic in obtaining this summer $11 M for pre-construction R&D. Proponents of the Superconducting Supercyclotron (SSC) in the US have formally requested support from the Canadian Federal Government, and we understand MOSST is leading an interagency committee including NSERC, NRC and AECL to draft a position paper by August. IPP has served notice to NSERC requesting to be consulted on the matter and is preparing a comprehensive paper urging to be consulted on the matter and is preparing a comprehensive paper urging support of the initiative for submission to government and other interested parties. Two meetings/institutes of Interest to members of PPD were held in Canada. The NSERC-CAP Summer Theoretical Institute on methods of quantum field theory and on field theories in two dimensions was held at the University of Alberta from July 10-24, 1987. The Third Lake Louise Winter Institute on high and low energy particle physics was held at Lake Louise from March 712, 1988. This year's Banff Summer Institute on Particle and Fields is scheduled for August 14—27; it is again organized by A.N. Kamal of the University of Alberta. See the report from the Theoretical Physics Division for more detailed descriptions of these institutes. P. Depommier of University of Montréal is planning a conference on Weak and Electromagnetic Interaction in Nuclei for May 15-19, 1989. This year the Canadian Invitation Committee for International Conferences had to select delegates to only one conference, the 26th International Conference on High Energy Physics, Munich, August 4-10, 1988. The number of applicants wishing to attend was less than the Canadian quota so all applicants were given invitations. Even so, invites who now do not intend to attend the Conference should so inform the organizers. The PPD is offering a full scientific program at this year's Congress. With one exception, big Canadian HEP experiments with new data will be reporting their results. The exception is the harmonium project at Fermilab (spokesman S. Conetti of McGill), whose results emerged unexpectedly soon after analysis began. Three invited speaker sessions with a total of eleven talks, 3ix experimental and five theoretical, have been scheduled. Once again the Nuclear Physics, Theoretical Physics and Particle Physics Divisions have scheduled a joint session at thi3 year's Congress. Representatives from MOSST and NSERC will be present to explain policies and answer questions from members. The PPD heartily congratulates Erich Vogt, Director of TRIUMF, for being the recipient of the 1988 CAP Medal and Claude Leroy, IPP Research Scientist at McGill and U. Montréal, for being the recipient of the 1988 Rutherford Medal. The PPD Executive thanks members for the generous support given to it, and invites them to attend the Annual Meeting at the June Congress to vote in a new team. 2.9 Division of Physics Education The division organized the 1987-88 CAP Lecture Tour (see the report in Section 5.2). Joint Committee of CAP-0APT-STA0 This is a Committee with members from three associations: P. Levan and D. McKay from the Ontario Association of Physics Teachers (OAPT), E. Dunning and A. Geddi3 from the Science Teachers' Association of Ontario (STAO), and I. Dean and P. Kirkby from the CAP. 7 A report is being developed secondary school levels. on physics teachers and other matters, at the elementary and The Committee sees a need for strengthening the teaching of physics. For example, it appears that most of the teaching of physics at the elementary and secondary levels, in Ontario, is done by teachers with a background in biology! The committee considers that there should interest in physics. be closer contact There have been four meetings of the Committee in the report has been prepared and should be finalized for the report will be published in Physics in Canada. 2.10 bodies with a common period May '87 - April '88. A draft June '88 CAP Council Meeting. The Division de physique des plasmas See p.Ill of Physics in Canada, July 2.11 between Division of Theoretical 1988. Physics The Division of Theoretical Physics has enjoyed another successful year; it continues its strong leadership in the organization of various summer schools. The 1987 CAP-NSERC Summer Institute in Theoretical Physics was held July 10-24 at the University of Alberta and attracted about 100 participants. The Institute, organized by F.C. Khanna, G. Kunstatter, H.C. Lee and H. Umezawa, consisted of the following programs: (1) Quantum Field Theory as an Interdisciplinary Basis (major topics: topological objects, models, stochastic processes); (2) Field Theory in Two Dimensions (major topics: nonlinear sigma models, unified field theories, critical phenomena). The two programs, held concurrently, featured approximately 20 invited speakers and 40 talks. The Proceedings of this Summer Institute are already available in two volumes (World Scientific) at the reduced rate of U.S. $30. - for both volumes. The 1987 CAP-NATO Advanced Study Institute on Interfaces, Quantum Wells and Superlattices was held at Banff during August 16-29. It was organized by Roger Taylor (Director), E.W. Fenton, C.R. Leavens and A.H. MacDonald, and attracted 16 lecturers and 80 participants from 13 countries. The school ran very smoothly and was well received by both participants and lecturers. Two sessions are planned for the Annual Congress in Montréal. The first session is on Astrophysics and features 3 speakers: B. Tupper (New Brunswick) on "Introduction to Cosmological Models", R. Wald (Chicago) on "Black Hole Thermodynamics" and R.P. Kirshner (Harvard) on "Supernova". A second session has been organized jointly with the Divisions of Nuclear Physics and Particle Physics. The sixth CAP-NSERC Summer Workshops will be held at Queen's University, Kingston, during July 5-24, 1988. The two concurrent programs are: (1) Physics of Disordered Matter (Directors: A.E. Jacobs and A-M.S. Tremblay); (2) Symmetry Violation Effects in Atomic, Nuclear and Particle Physics (Directors: G. Karl and B. Castel). The Banff Summer Institute (CAP) 1988 on Particles and Fields in Banff, August 14-27, is being organized by A.N. Kamal and sponsored by the Theoretical Physics Division of the CAP, NSERC, The University of Alberta, IPP, TRIUMF and AECL. The list of speakers includes: (i) 4 hours each: D. Hitlin (Caltech) - Charm Experiments: J.D. Prentice (Toronto) - Beauty Experiments; J. Schwarz (Caltech) - Superstrings; A.M. Polyakov (Landau Institute, unconfirmed) - Recent Developments in Field Theory; J. Ro3ner (Chicago) - Heavy Flavour Theory; G.C. Ross (Oxford) - Superstring Phenomenology; speaker to be confirmed - Conformai Field Theory. (ii)3 hours each: M.D. Shapiro (Harvard) - pp Tevatron Results; G.T. Ewen (Queen's) - Passive Experiments and SNO; A. Maki (iii) 2 hours: (iv)l hour: T. Himel S. Coleman (KEK) - TRISTAN Results. (SLAC) - SLC Results. (Harvard) - Cosmological Constants. In addition, there will be 14 one-hour seminars given by participants. H.C. Lee and G. Kunstatter have agreed to organize a Summer School on Geometrical and Topological Methods in Physics to be held at Banff, August 13-25, 1989, while D. Pink has agreed to organize the 1990 Summer School on Statistical Physics. The Division would like to see established an efficient mechanism to organize Topical Conferences on "new aspects" in physics on short notice. (This idea has been advanced by David Pink.) The typical notice time for these special conferences, which might last anywhere from one day to three days, is envisaged to be about three months. The purpose of such a mechanism, applicable to all Divisions within the CAP, would be to give potential organizers reasonably swift access to the necessary funding (e.g. from NSERC) and to administrative support from the CAP. 8 2.12 Division of Industrial and Applied Physics See p.Ill of Physics in Canada, July 1988. 2.13 Division of Surface Science The Division of Surface Science remains a joint division of the Canadian Society for Chemistry and the Canadian Association of Physicists with a membership of over 150. In June, Dr. David Frost (UBC Chemistry) assumed the role of chairman replacing Dr. Dennis Salahub (U. Montreal Chemistry) and Dr. Robert Tapping (Chalk River Nuclear Labs) was elected Vice Chairman. Dr. Thomas Jackman (NRC Ottawa) assumed the role of Secretary/Treasurer in October replacing Dr. David Creber (ALCAN Kingston) who retired after 3 years in the position. The Division was very active in promoting surface science in Canada. Together with the Catalysis, Theoretical and Physical Chemistry Divisions a joint symposium was organized at the CIC annual meeting held in Quebec City. The title 'Applications of Surface Science in Catalysis' reflects the interdisciplinary theme of the symposium. The Division is grateful to Serge Kaliaguine and Stewart Mclntyre for their roles in the organization. At the CAP Congress in Toronto, a symposium emphasizing semiconductor growth techniques for producing multilayer structures was held. The symposium was organized by Derek Houghton and consisted of five invited talks [Iyer (IBM Yorktown), Houghton (NRCC), 3pringThorpe (BNR), Putz (BNR) and Park (3M)]. Attendance was excellent averaging nearly three times the Physics membership of the Division. In addition, a well attended poster session was also organized. Finally, the Division again financially aided the LASST/ACSIS annual workshop on Campobello Island in August. The topic in 1987 was 'Diffusion at Interfaces: Microscopic Concepts'. 3. MEMBERSHIP 3.1 There are three categories of membership in CAP. Full membership is available to anyone who holds a bachelor's degree in Physics or a related subject. Thus graduate students belong as full members. Full members are entitled to all the rights and privileges of the Association. The category of affiliate membership is intended for those whose primary professional interest is in a field other than physics. Student membership is available only to undergraduate students in physics. Full members in good standing may, upon reaching retirement, take advantage of reduced fees. Members of the Canadian Association of Physicists may become members of the Chemical Institute of Canada and pay a special combined fee. The fee payable by such persons is 70% of the total applicable fees for both organizations. Report of the Director of Members The duty of the Director - Full members is essentially to review and approve applications for membership in the Association. the exercise consists in verifying if the candidate applying for membership satisfies the general criteria listed in the CAP By-laws. In the applications received particular attention was paid to the declaration of the sponsor. In most cases the sponsor named was a CAP member and the application was automatically processed. If the sponsor was not a CAP member I would normally contact him. If no sponsor'3 name was given I contacted the applicant and tried to resolve the difficulty with him. Usually thi3 was done rapidly. In 1987, 156 applications were received: 32 full members, 70 graduate students, 3 affiliates, 37 students, 12 re-instatement and 2 joint memberships. In the first part of 1988, 69 applications were received: 26 full students, 16 students, 2 affiliates, 1 joint and 6 re-instatements. members, 18 graduate There are questions raised relative to the requirement for a sponsor's signature on the application form, and some candidates find it somewhat inappropriate. Personally I find that it is of great importance that the Association rely on some kind of reference that can answer for the qualifications of applicants. The Association needs members active in the field of physics. Its credibility relies on these members. Of course other means could be found. For example only the name of a reference could be required. If needed the reference could be consulted. At this time this approach would appear to be the simplest one. I have been most successor. J.V. happy to serve in the function for the last years and wish the best to my Report of the Membership Committee The Committee was asked to consider whether the by-laws of the CAP conflict In any way with the current legislation on rights, particularly with respect to the explicit specification of the age, 65 years, at which members may be considered to be retired. The existing regulations were found to be satisfactory; no action was recommended to the Executive. 3.2 The Membership Campaign Committee consists of the Vice-President Elect as chairman and the councillors who represent the various electoral districts of the Association. The heads/chairmen of Canadian university physics departments al30 assist in recruiting members in their universities. ANNUAL REPORT RAPPORT ANNUEL 1987-1988 CANADIAN ASSOCIATION OF PHYSICISTS ASSOCIATION CANADIENNE DES PHYSICIENS JUNE/JUIN 1988 Membership Report A total of 145 new members joined the Association and 12 members were reinstated in 1987. There were 15 resignations and 198 suspensions. Members in arrears are kept on C A P records but no longer receive C A P publications or other mailings; they are suspended when they are more than one year in arrears. The details of membership are given in the table below. Membership Report for 1987 as of December 31, 1987 Paid up 1986 Renewals New Members Reinstatements Deceased In Arrears Paid up 31/12/87 1213 1104 33 12 15 94 1149 Graduate Students 123 71 68 52 139 Affiliate Members 41 33 3 8 36 142 119 4 23 123 Retired Members 49 49 4 Without Fees 33 29 Subtotal 1601 1405 112 46 25 33 1647 1430 145 Full Members Joint Members Student Members Total Resigned/ 53 4 12 12 19 19 29 177 1529 21 58 198 1587 Membership in Divisions As of 31/12/86 Aeronomy and Space Physics Atomic and Molecular Physics Canadian Geophysical Union Condensed Matter Physics Medical & Biological Physics Nuclear Physics Optical Physics Particle Physics Physics Education Plasma Physics Theoretical Physics Industrial & Applied Physics Surface Science DASP DAMP CGU DCMP D M BP DNP DOP PPD DPE DPP DTP DIAP DSS Total 78 138 52 203 As of 31/12/87 147 111 124 70 80 145 125 38 87 133 48 199 123 138 109 133 71 75 157 125 46 1437 1444 As of 31/12/86 As of 31/12/87 86 87 13 4 23 14 26 126 126 Journal Subscriptions Canadian Journal of Physics Canadian Journal of Earth Sciences Contemporary Physics Physics in Medicine & Biology The Physics Teacher Québec Science Physics Today Physical Review Letters Medical Physics Physics Bulletin Physics Education Physics in Technology Total 18 5 32 15 26 140 10 13 4 3 6 3 9 23 21 373 334 Report of the Honorary Secretary-Treasurer A t the end of the 1987 financial year the General Fund has a surplus of $13,961, down $15,217 from last year. The interest on the Reserve Fund over the year ($4,522) was added to this fund increasing it to $79,885. The Educational Trust Fund remains healthy with a surplus of $47,182. The audited financial statements and balance sheet for the twelve month period January 1 to December 31, 1987 with comparative figures for 1986 follow. A MEMBER OF ARTHUR YOUNG INTERNATIONAL Clarkson Gordon Chartered Accountants Suite 1600 55 Metcalfe Street Ottawa, Canada K1P 6L5 Telephone: (613)232-1511 Telex: 053-4206 AUDITORS' REPORT To the Members of The Canadian Association of Physicists: We have examined the balance sheet of The Canadian Association of Physicists as at December 31, 1987 and the statement of revenue and expense and surplus for the year then ended. Our examination was made in accordance with generally accepted auditing standards, and accordingly included such tests and other procedures as ve considered necessary in the circumstances, except as explained in the following paragraph. In common with many not-for-profit organizations, the Association derives revenue from meetings and donations the completeness of which is not susceptible of satisfactory audit verification. Accordingly, we were unable to determine whether any adjustments for unrecorded revenue might be necessary to annual meeting revenue, donation revenue, excess of revenue over expense (expense over revenue) for the year and surplus. In our opinion, except for the effect of any adjustments which might have been required had we been able to satisfy ourselves with respect to the revenue described in the preceding paragraph, these financial statements present fairly the financial position of the Association as at December 31, 1987 and the results of its operations for the year then ended in accordance with the accounting principles described in note 1 to the financial statements applied on a basis consistent with that of the preceding year. Ottawa, Canada, April 7, 1988. Chartered Accountants MEMBRE D'ARTHUR YOUNG INTERNATIONAL Comptables agréés Clarkson Gordon 55, rue Metcalfe, bureau 1600 Ottawa, Canada K1P 6L5 Téléphone: (613) 232-1511 Télex: 053-4206 RAPPORT DES VÉRIFICATEURS Alix membres de l'Association canadienne des physiciens, Nous avons vérifié le bilan de l'Association canadienne des physiciens au 31 décembre 1987, ainsi que l'état des revenus et dépenses et du surplus pour l'exercice terminé à cette date. Notre vérification a été effectuée conformément aux normes de vérification généralement reconnues, et a comporté par conséquent les sondages et autres procédés que nous avons jugés nécessaires dans les circonstances, à l'exception des limites mentionnées au paragraphe suivant. Comme beaucoup d'organisations à but non lucratif, l'Association génère des revenus de réunions et de dons dont l'intégralité n'est pas susceptible à une vérification satisfaisante. Par conséquent, il ne nous a pas été possible d'établir si des redressements dus à des revenus non enregistrés auraient été requis aux revenus provenant de la réunion annuelle, revenus de dons, à l'excédent des revenus sur les dépenses (des dépenses sur les revenus) pour l'exercice et au surplus. A notre avis, à l'exception de la possibilité de redressements qui auraient pu être requis s'il nous avait été possible de nous satisfaire quant aux revenus mentionnés au paragraphe précédent, ces états financiers présentent fidèlement la situation financière de l'Association au 31 décembre 1987 ainsi que les résultats de son exploitation et l'évolution de sa situation financière pour l'exercice terminé à cette date selon les principes comptables décrits dans la note 1 afférente aux états financiers appliqués de la même manière qu'au cours de l'exercice précédent. Ottawa, Canada, le 7 avril 1988, Comptables agréés THE CANADIAN ASSOCIATION OF PHYSICISTS/ASSC (Incorpo rated under the BALANCE SHE DECEMBER 31, GENERAL FU A S S E T S 1987 1986 $ 43,658 99,071 7,940 18,133 317 9,207 $ 16,381 68,988 7,701 41,119 3,312 1,941 178,326 139,442 Fixed, at cost: Office furniture and equipment 17,708 31,004 Less accumulated depreciation 14,167 23,705 3,541 7,299 $181,867 $146.741 Current : Cash Term deposits (at cost which approximates market) Advertising revenue receivable Other receivables Prepaid expenses Due from Educational Trust Fund EDUCATIONAL TRUS A S S E T S Cash Term deposits Accrued interest receivable i 14,609 45,000 120 i 12,527 36,000 427 j 59.729 j 48.954 On behalf of the Council: Officer Officer (See accompanying notes to CIATION CANADIENNE DES PHYSICIENS Laws of Canada) ST 11987 "ÎD LIABILITIES AND MEMBERS' EQUITY Current : Accounts payable and accrued charges Deferred revenue Due to divisions 1987 1986 i 12,031 43,290 20,305 * 6,,123 6,,665 14,,830 75,626 27,,618 12,395 79,885 13,961 14, 582 75, 363 29,178 106,241 119,123 $181.867 $146.741 $ $ Members' Equity: Science Policy Fund Reserve (note 5) Surplus FUND LIABILITIES AND SURPLUS Deferred donation revenue Due to General Fund Surplus the financial statements) 3,340 9,207 385 1,941 12,547 47,182 2,326 46,628 j 59.729 $ 48,954 THE CANADIAN ASSOCIATION OF PHYSICISTS/ASSOCIATION CANADIENNE DES PHYSICIENS GENERAL FUND STATEMENT OF REVENUE AND EXPENSE AND SURPLUS FOR THE YEAR ENDED DECEMBER 31. 1987 Revenue : Membership fees Physics in Canada - advertising - subscriptions Annual meeting (net) Journal subscriptions Contract services Investment income Miscellaneous Careers in Physics (net) Industrial Course (net) Corporate members conference (net) Gain on sale of fixed assets Expense: Salaries Physics in Canada Data processing and related maintenance and supplies (note 1(e)) Printing and postage Journals Rent Employee benefits Miscellaneous Travel Legal, audit and accounting Telephone Depreciation Medals Directory of Physicists (net) Exchange loss 1242 ISM $ 89,236 27,398 1,749 40,447 15,869 11,156 5,785 4,729 263 75 468 695 $ 89,547 28,234 1,299 26,424 17,123 8,760 7,848 4,771 1,927 38 197,870 185,971 76,896 34,323 75,671 28,038 21,795 13,527 15,917 15,013 9,408 6,970 3,054 4,914 2,326 1,866 749 1,904 21,855 16,249 11,408 8,324 7,400 5,629 3,320 3,107 2,310 749 523 1.807 208,565 Excess of expense over revenue for the year Surplus, beginning of year Transfer to reserve (note 5) (10,695) 29.178 186 r487 (516) 34,549 18,483 34,033 (4.522) (4,855) Surplus, end of year & 13.961 (See accompanying notes to the financial statements) j 29.178 THE CANADIAN ASSOCIATION OF PHYSICISTS/ASSOCIATION CANADIENNE DES PHYSICIENS EDUCATIONAL TRUST FUND STATEMENT OF REVENUE AND EXPENSE AND SURPLUS FOR THE YEAR ENDED DECEMBER 31, 1997 1232 Revenue : Donations - members - corporations - universities - other Interest and miscellaneous Expense: Prizes Lecture tours Other Undergraduate physics conference ISM $ 6,937 7,460 840 $ 6,867 6,250 965 2.700 4.142 17,937 18,224 8,395 5,926 1,037 2,025 8,460 6,020 2,002 2.000 17,383 19.4Ç2 Excess of revenue over expense 554 (258) (expense over revenue) for the year 46.628 46.886 $47.182 $46.628 Surplus, beginning of year Surplus, end of year (See accompanying notes to the financial statements) THE CANADIAN ASSOCIATION OF PHYSICISTS/ASSOCIATION CANADIENNE DES PHYSICIENS NOTES TO THE FINANCIAL STATEMENTS DECEMBER 31. 1987 1. Accounting Policies The financial statements of the Association have been prepared by management in accordance with accounting principles that are considered appropriate for organizations of this type. Revenue and expense of the Divisions and the Science Policy Fund are not reflected in the Statement of Revenue and Expense and Surplus of the Association. The more significant accounting policies are summarized below: (a) Membership Fees: Annual membership fees pertaining to the current year are recorded in income as received. These fees include a subscription to the Association's bulletin - Physics in Canada. The portion of fees paid by members on account of the Physics in Canada subscription is included in membership fees revenue. Subscription fees purchased by non-members are included in subscriptions revenue. (b) Donations Revenue: Donations revenue is recorded as income when received. Donations which are specified for the following year are included in deferred donation revenue. (c) Deferred Revenue: Revenue received pertaining to future years' is recorded as deferred revenue. (d) Expense: Expenses are recorded on the accrual basis of accounting, except that costs of publications are charged to expense as incurred. THE CANADIAN ASSOCIATION OF PHYSICISTS/ASSOCIATION CANADIENNE DES PHYSICIENS NOTES TO THE FINANCIAL STATEMENTS DECEMBER 31, 1987 Accounting Policies (Cont'd) (e) Fixed Assets and Depreciation: Commencing in 1987, all equipment lease costs are charged to expense when paid. In 1986 and prior years, computers under capital lease were carried as a fixed asset and the related lease obligation was carried as a liability in the balance sheet. The effect of this change in accounting on the results of operations is that data processing expense for 1987 has been increased by $1,088 to $21,795. Purchased fixed assets are recorded at cost and are depreciated over the estimated useful life of the asset using the following rates: Furniture and equipment Computer equipment Tax - 20% declining balance - 20% straight-line s m v g The Association is a non-profit organization as defined in Section 149(1)(1) of the Income Tax Act and, as such, is exempt from income taxes. Commitments The Association has leased office space for a period of ten years expiring in May, 1996 for a basic annual rental of $13,693 for the first five years and $16,914 for the subsequent five years. Computer lease commitments total $13,720 for 1988 and 1989 and $6,371 for 1990. THE CANADIAN ASSOCIATION OF PHYSICISTS/ASSOCIATION CANADIENNE DES PHYSICIENS NOTES TO THE FINANCIAL STATEMENTS DECEMBER 31. 1987 Statement of Changes In Financial Position A statement of changes in financial position is not presented since it would not provide any additional useful information. Reserve During 1982 the Council approved the establishment of a reserve of $65,000, which is not to be encroached upon without formal approval of the Council. Interest earned on reserve funds is transferred to the reserve. Educational Trust Fund The Educational Trust Fund is intended to further the education of physicists ««id increase public awareness of the work and roles of the physicist through the sponsorship of seminars and granting of achievement awards. C o m p a r a t i v e Amountg Certain 1986 comparative amounts have been reclassified to conform with the presentation adopted in 1987. 9 The membership campaign for 1987/88 targeted four groups: university physicists who are not members of CAP previous members who had allowed their membership to lapse physicists (especially Canadians) working in the United States physicists working in national research centres such as TRIUMPH, NRC AND CRC The campaign message reinforced the need for physicists to become more actively engaged, especially through the Association, in promoting the role of science and technology in Canada, while the campaign for the current year i3 not yet over, preliminary statistics show 110 new members and 378 not renewing membership. The paid up membership for 1987, together with comparative figures for 1986 are given in the annual report. The current membership represents a net decline of nearly 300 over the past 7 years. To reverse this trend, all members of CAP will have to assist in recruiting physicists to join the CAP. It is particularly important that increased efforts be made to solicit physicists working in industry and in teaching to encourage them to become more involved in the professional activities of the Association. Council is currently considering a new approach for recruitment which will be discussed at the annual Congress in June. 3.3 Details of the paid up membership for 1987 with comparative figures for Annual Report p.2. 1986 are given in the CORPORATE MEMBERSHIP The category of corporate member is established for those institutions with a responsibility or a desire to promote and support the science of physics in Canada through the activities of the Association. The corporate membership is particularly sought among those industrial organizations, government laboratories and universities which employ substantial numbers of physicists. The corporate "membership of public-spirited organizations which do not employ physicists is also appreciated. Corporate membership fees of private business and industry are deposited in the tax-exempt Educational Trust Fund. Following the formation of the Division of Applied Physics (DIAP) in 1979 it was evident that a sizeable portion of the academic physics community had an interest in the practical applications of physics. Steps were taken to try to bring about closer interaction between the members of DIAP and the Corporate group. These steps were to automatically extend DIAP membership to a designated representative of a Corporate member and to hold joint meetings when and where practicable. 4. 1 The Corporate Members group organizes a one day meeting representatives of industry, government and the universities. each year to bring together The corporate members held their annual conference on April 12, 1988 at the Toronto Airport Skyline Hotel. The theme was Centres of Excellence in Canada. The invited speakers were: R. Boorman, Executive Director, New Brunswick Research and Productivity Council: "The Role of a Provincial Research Orga nization in Promoting a Strong Canadian Economy through High Technology"; P. Lavigne, Directeur, Institut National d'Optique: "The Interaction of Government-Established Independent Resea rch Centres with Industry and University"; R. Woodbridge, President, Canadian Advanced Technol ogy Association: "The Centre of Excellence Proposal and the Funding of Industrial R & D"; T. R. Pryor, President, Diffracto Limited: "Needs of Small and Medium High Technology Compan ies in Canada"; J.E. Pinel, Director, University Interaction Bell Northern Research: "Cen très of Excellence: Pro3 and Cons"; J.B. Salley, Deputy Secretary Industry and Intergovernment Relations: "New Directions in Federal Science and Technology Policy: Centres of Excelle nee"; M.F. Walmsley, Director, Premier's Council Technology Fund: "Centres of Excellence in Ontario"; J. L'Ecuyer, President, Conseil des Universités du Québec: "Centres of Excellence in Québec and their Effectiveness in Promoting High Technology Industries". The panelists in the discussion session were: Walmsley and R. Woodbridge. 4.2 Current Corporate R. Boorman, L'Ecuyer, T.R. Pryor, M.F. Membership ALCAN INTERNATIONAL LTD. ALLAN CRAWFORD ASSOCIATES LTD. ANATEK ELECTRONICS INC. APTEC ENGINEERING LIMITED ATLANTIS AEROSPACE CORPORATION ATMOSPHERIC ENVIRONMENT SERVICE ATOMIC ENERGY OF CANADA LIMITED BELL-NORTHERN RESEARCH LTD. CAE ELECTRONICS LTD. CANADIAN INDUSTRIAL INNOVATION CENTRE/WATERLOO C0MINC0 LTD. ELECTRONIC MATERIALS CTF SYSTEMS INC. EALING SCIENTIFIC LIMITED EDWARDS HIGH VACUUM (CANADA) LIMITED EG & G INSTRUMENTS HYDRO-QUEBEC LEIGH INSTRUMENTS LIMITED LINEAR TECHNOLOGY INC. LUMONICS INC. MITEL CORPORATION MOLI ENERGY LIMITED MPB TECHNOLOGIES INC. NATIONAL OPTICS INSTITUTE ONTARIO HYDRO OPTECH INCORPORATED OPTO-ELECTRONICS INC. POLYSAR LTD. QUEEN'S UNIVERSITY RAYONICS INC. RCA INC. SOUTHERN ALBERTA INSTITUTE OF TECHNOLOGY SPAR AEROSPACE LIMITED SRP CONTROL SYSTEMS LTD. TASMAN SCIENTIFIC INC. TECHNICAL MARKETING ASSOCIATES LIMITED TRIUMF VG INSTRUMENTS CANADA INC. UNIVERSITY OF WATERLOO XEROX RESEARCH CENTRE OF CANADA EDUCATIONAL ACTIVITIES Education Activities of CAP are defined as the activities which contribute to the education in physics of the general public and of students up to graduation at the B.Sc. level. Activities which are of direct benefit to our full members, including graduate students, are by contrast called professional activities. Educational activities include the CAP secondary school examinations, the CAP university prize examination, CAP lecture tours and publications on educational subjects. Educational Trust Fund The Educational Trust Fund (ETF) is a tax exempt fund in which donations from Corporate Members and individual members are accumulated to support the educational activities of the CAP. The fund is administered by a board of three trustees appointed by the CAP Executive. The donations of individual members to December 31, 1987 and to date in the 1988 fiscal year, have been very encouraging. A total of $6937 was contributed by members when they renewed their membership in 1987. The CAP Lecture Tours The CAP Lecture Tour for 1987/88 was coordinated by the chairman of the Division of Physics Education. A letter was sent to all the physics departments asking for suggestions for CAP Lecturers. A list of speakers was then selected and circulated to all physics departments in Canada. It was then the responsibility of each chairman, or his/her delegate, to make arrangements with the speaker that the department chose to be their CAP Lecturer. It was suggested that, in order to facilitate travel arrangements, two or more departments might like to get together and agree on one speaker. In general, CAP supported transportation costs whereas the departments covered local expenses. Of the 20 speakers suggested thi3 year, the following 9 speakers delivered 26 different CAP lectures. There may have been others. M.J. Bronskill (Toronto) C. Burgess (McGill) Dalhousie. Bruce Campbell spoke at Western Ontario spoke at (Victoria) Regina, Saskatchewan, U.N.B., St. Francis Xavier, Acadia and 3poke at Winnipeg, Manitoba and Brandon. G.T. Ewan (Queen's) spoke at Université de Montréal, Waterloo, Simon Fraser, University of British Columbia, Malaspina College, Royal Roads and Victoria. F.T. Hedgcock Allan Jacob (McGill) spoke at McMaster University. spoke at Trent and Brock. M.A.R. LeBlanc spoke at Concordia and Lakehead. W.H. Lehn (Manitoba) G. Roy (Alberta) spoke at Western Ontario. 3poke at Calgary, and Red Deer and Mount Royal Colleges. CAP University Prize Examination The CAP University Prize Examination studying physics. The Educational Prize, of $605.00; a second prize of winner of the first prize receives prize at the banquet. is a nation-wide competition among senior undergraduates Trust Fund provides a first prize, The Lloyd G. Elliott $363.00, and a third prize of $171.50. In addition, the an expense-paid trip to the Annual Congress to receive his The Committee of Heads of Physics Departments University Prize Exam. has agreed to ensure the continuity of the This year's examination was prepared and marked by a group from the University of Regina. examination was written by 152 students from 27 different institutions. The The three prize winners were: First Prize: Second Prize: Third Prize: Christopher Neufeld, McGill University Ernest Pun Chan, University of Toronto Krishna Rajagopal, Queen's University The Undergraduate Physics Conference The 23nd Canadian Undergraduate Physics Conference was held in October, was organized by a group of students from the University of Calgary. 1987 in Calgary. it The 24th Conference will be held at Dalhousie University, in the fall of 1988. Youth Science Foundation and the Canada-Wide Science Fair The youth Science Foundation continues to provide excellent support in various areas to promote science among the youth in Canada. The major emphasis continues to be the Science Fairs, with the 27th annual Canada-Wide Fair being held in Winnipeg during May of this year. However increased government support has enabled the Foundation to expand in other areas, and investigate the development of new programs. These include an increased number of science awards in many areas: wider distribution of the Youth Science News and an improvement in its format; "Flabbergast", a science magazine for youth from 7 to 14 years; and reorganization of the national Students' Science Council into the Young Scientists of Canada. The Science 11 Olympics program has been expanded with the first national Science Olympics to be held in Ottawa on December 6-8, 1988, and additional resource materials have been developed for science teachers and students in all program areas. The YSF still relies heavily on its volunteer network, and continues to encourage teachers scientists to become more involved in helping young people to channel their activities. 5.6 CAP Secondary School Physics Prize and Examination The Secondary School Examinations continue to be administered efficiently in the Provinces across Canada. Certificates of merit are now awarded as a means of encouraging those students who did well but not well enough to receive a prize, and have been awarded again this year. The CAP owes a vote of thanks to those who conduct the examinations. It involves a great deal of time and the financial generosity of the organizers' Physics Departments. In each province a total of $770 was offered by the CAP, to be divided among the winners, at the discretion of the provincial examiner. The name of each principal examiner is given below in parentheses along with the names of the winners. Additional prizes were offered in some provinces by the University Physics Departments, which are gratefully acknowledged. For example: Memorial University provided $400 for honorable Mentions; Québec universities $890 for additional ca3h prizes; the University of Winnipeg $130 and Winnipeg, Manitoba and Brandon 50% fee reduction (1st y e a r ) to the top 5 winners; Alberta about $230; S.F.U. and U.B.C. $150 for additional prizes. There may have been others. 5.7 Table CAP SECONDARY SCHOOL PHYSICS PRIZE EXAMINATION - 1988 Newfoundland (R.B. Bishop) 1. Liam Keliher, Vater's Collegiate, St. John's 2. Cory Pye, Cabrini High School, Corner Brook 3. Natalie Baddour, Holy Heart of Mary, St. John's David Bryant, Brother Rice High School, St. John's Nova Scotia and Prince Edward $350.00 220.00 100.00 100.00 Island 1. 2. 3. P.E.I. 1. 2. New Brunswick (B. Hede) 1. Todd Wood, Miramichi Valley Kirk Reid, Saint John High 3. Tom Lees, Fredericton High David Gay, Miramichi Valley 275.00 275.00 110.00 High School School School High School 110.00 Québec (J.R. Derome) 1. Luc Tremblay, CEGEP Sorel 2. Pierre-Paul Renaud, Semainaire de Québec 3. David Faubert, Champlain Regional College 400.00 350.00 300.00 Ontario (W.J. Megaw) 1. Michael de Lind Van Wijngaarden, Nepean High School Trevor Blackwell, Gloucester High School 2. Garth Mayville, Bradford District High School 3. Jim Carlyle, Martingrove Collegiate Institute Manitoba (G. Kunstatter) 1. Rick Chartrand, Miles Macdonell 2. Kohji Suzuki, Grant Park 3. Patrick Bowman, Miles Macdonell Nicholas Hesse, St. John's Ravenscourt Diego Ng, Nelson Mclntyre Saskatchewan (R. Montalbetti) 1. Darrell Harrington, Aden Bowman Collegiate, 2. Aaron Phoenix, Thorn Collegiate, Regina 3. Ken Cole, Balfour Collegiate, Regina Saskatoon Alberta (T. M a t h e w 3 ) 1. Richard Wan, Strathcona Composite High School 2. Graham Denham, Old Scona Academic High 3. Kevin Oler, McNally Composite High School 4. David Hwang, Sir Winston Churchill High School Stephen Chen, Sir Winston Churchill High School British Columbia (D.J. Huntley) 1. Dennis Chow, Burnaby South Peter Madden, Sir Winston Churchill 3. Howard Semenoff, Grand Forks Grade XI 1. Erick Wong, Sir Winston Churchill 250.00 250.00 170.00 350.00 250.00 100.00 100.00 100.00 400.00 250.00 120.00 300.00 200.00 100.00 50. 00 50. 00 325.00 325.00 150.00 120.00 12 SCHOOLS PARTICIPATING EXAMINER PROVINCE STUDENTS WRITING R.B. Bishop 48 307 New Brunswick B. Hede 30 271 Québec J.-R. Derome 37 167 w. J. Megaw 160 1203 Newfoundland Nova Scotia and Prince Edward Island Ontario Manitoba G. Kunstatter 54 230 Saskatchewan R. Montalbetti 52 179 Alberta T. Mathews 38 143 British Columbia D.J. Huntley 99 279 6. MEETINGS AND SUMMER SCHOOLS CAP has been holding an Annual Congress ever since the Association was founded. The first CAP summer school, in theoretical physics, «as held in Edmonton in 1957. Scientific meetings and summer schools are among the most important of CAP activities. Details of 3ome of these meetings are given in the reports of the divisions. 6.1 Annual Congress The Annual CAP Congress is the most important event of the year for the Canadian Physics community. Here each year the vast majority of Canada's leading physicists meet to communicate the results of their research, learn of the research of their colleagues, discuss science policy, promote physics education and conduct the affairs of the Association. Some statistics on recent congresses are given in the following table. Congress Year Contributed 344 Number of Papers Invited 73 Total 417 Number of Registrants 609 Toronto 1975 Québec 1976 565(450) 72 637 824 Saskatoon 1977 170 65 235 357 London 1978 214 69 283 423 Vancouver 1979 222 66 288 443 Hamilton 1980 205 76 281 511 Halifax 1981 190 78 268 402 Kingston 1982 216 74 290 494 Victoria 1983 258 67 325 545 Sherbrooke 1984 270 69 339 552 Fredericton 1985 170 58 228 349 Edmonton 1986 174 71 245 350 Toronto 1987 312 82 394 656 Montréal 1988 320 97 417 For the tripartite meeting of 1976 the number in brackets is the from Canadian institutions. number of contributed papers Future congresses have been scheduled as follows: 1989 - University of Guelph, June 26-28 1990 - Memorial University of Newfoundland, June 18-20 1991 - University of Manitoba, June 7 PUBLICATIONS 7.1 Canadian Journal of Physics In addition to its normal publications procedures, the Canadian Journal of Physics has published a number of Special Issues (arising from conferences and workshops, and as Festschrifts in honour of distinguished colleagues) during the years. Other special issues (including one sponsored by the Optics Division of CAP) are currently being processed. Regrettably a major publications hiatus of a few months took place when the Ottawa printing firm which handled the production of the journal under NRC supervision, went into receivership. The journal is now printed by the University of Toronto Press, and the production delays are 13 almost caught up. The panel of expert associate editors has been augmented by two to cover the topics of Gas Dynamics (Prof. J. Gottlieb UTIAS) and Electromagnetism (Prof. R. McPhie, Waterloo). Prof. Claude Delisle (Laval) recently retired as Associate Editor (Optics) after many years of much appreciated service. Prof. M. Piché (Laval) has assumed responsibility as Associate Editor (Optics). 7.2 Physics in Canada This report of activities of "Physics in Canada" is really redundant since our activity is evident in each issue. However for the record here is the official report: "Six issues of "Physics in Canada" were produced in 1987-8 by the team of professionals at the office of the Canadian Association of Physicists with the help of the amateurs of the Editorial Board. With the appearance of this issue we say farewell to Juris Svenne Gerard Hébert of York University has taken over this position." 7.3 Journal as Book Review Editor. Subscriptions As one of its services to members, CAP acts as "Subscription Agent" for technical publications of other organizations. This year twelve (12) publications were available to members at reduced subscription rates. Statistics are given in the Annual Report. 8. OTHER ACTIVITIES 8.1 Science Policy Committee The Science Policy Committee, chaired by the President, at the request of Council and the Annual General Meeting, has completed its agenda with the publication of the report: Physics in Canada: A Brief Survey and Outlook. 8.2 Physics and Society The main activity was the chairman's organization of the next Physics and Society session at the CAP Congress, the topic this year being Canadian Space Science: Its Impact on Society and on the Physics Community. In March the Committee chairman and the C.A.P. Executive Secretary participated in the Royal Society's Workshop on Public Awareness of Science. A presentation on that topic followed by a discussion on implications for the CAP will be an agenda item on June 21, 1988 at the Annual General Meeting. 8.3 Honorary Advisory Council of Past Presidents The Honorary Advisory Council of past Presidents, constituted of all the former presidents of CAP was officially established at the Annual General Meeting in June 1970. It has held a meeting at each subsequent Congress and will be holding one again thi3 year at the Université de Montréal. 8.4 Employment Opportunities Committee The Employment Contact Service whereby those seeking jobs and those with positions available could register their respective information was continued at the CAP office. This information is distributed on request to those who contact the service. At last year's Congress the Committee operated a Job Placement Centre at which jobs were advertised and facilities were provided for interviews. It is intended to again provide this service at the congress in Edmonton. The annual survey of graduate students in Canadian Universities was carried out and the results were published in the March 1988 issue of Physics in Canada. 8.5 Committee of University Physics Department Heads and Chairmen The annual meeting was held on Monday, June 15, 1987 at the Faculty Club of the University of Toronto and was chaired by Professor R. E. Azuma. Items discussed included agreement on a maximum stipend for summer students of $1,500 per month, ways of encouraging more graduate students to become members of CAP, workshops, science and society recommendations, and the collection of career profiles for a new edition of Careers in Physics. A total of 25 physics heads (or representatives) attended the meeting. I am told that it is the custom that the Head of the Department hosting the Annual Congress should be Chair of the Committee of Heads for the following year. I would thus suggest to council that the Head of the Department of Physics of the University of Montreal be asked to serve as Chair of the Committee of Heads. M. B. W. 8.6 The Directory of Canadian Physicists The first edition of the Directory was published in January 1986. copy of the Directory. CAP members have received a The volume contains, in alphabetical order, biographical sketches of 1500 Canadian physicists, and the classification of individuals by their main area of interest. A questionnaire is available for members of CAP who chose not to submit an entry for the first Directory but who wish to be included in further editions of the Directory. The Committee is now working on plans to publish a second edition. 14 8.7 Committee or. Professionalism The 7-member Committee has had an active year as can be seen from the following actions: organized an evening session at the 1987 Congress on Professionalism. There were 60 individuals at the session even though it was in competition with another session on superconductivity; prepared a 15-page Discussion Document, "The Professional Scientist in Canada". been addressed by Council. Further work is to be done by the Committee; arranged a session at the 1988 Congress on the Discussion Document; This has and alerted Council of changes to the definition of the practice of engineering Newfoundland. These would infringe on the practice of the natural scientist. Ongoing activities of the Committee include the developing a and CAP membership in following: certificate and guidelines on the issuing of the certificate, providing the occasional item on professional matters to Physics in Canada. A separate committee, consisting of A. Olin, A. Yelon, and P. Kirkby, has provided to Council a short report on the steps that are proposed for the Discussion Document. Their report outlined the actions that the Committee on Professionalism will be undertaking, with the approval of Council, including: publishing the Canada; Discussion Document, with the set of questions and answers in Physics in organizing a questionnaire on elements of the Discussion Document for assessment of the response of the CAP membership to the proposal of the establishment of professional bodies covering natural scientists; and providing the Discussion Document to other scientific societies with the object of further development of the Discussion Document to reflect the wishes of the scientific community. Should any member of the CAP wish to assist the Committee please write to any member of the Committee: B. Ahlborn, H.J. Bronskill, K.E. Breitman, C.S. MacLatchy, F.J. Morgan, J. Vanier, P. Kirkby (Chairman). 8.8 Committee to Encourage Women in Physics The members of the committee have pursued individual efforts through informal consultation and discussion within organizations including: Ontario Hydro, MOSST, NSERC, York University, University of Toronto, Toronto School Board, CAP Itself. In addition, Including: a number of career talks and presentations have been made by Committee members. presentation and display at Science Teachers' Association conference participation in the WISH (Women In Science, Hopefully) Program at York presentation as part of Richview Collegiate's Career Day participation in Toronto in November Program in a Career activity at Northview Heights Secondary participation in Horizons, a career conference School in Toronto participation in a career day at Guelph University for high school participation in a panel discussion Centre in Toronto University students "What's my Line" as part of a Career Day at the presentation at a Workshop called "Physics students held at Ontario Hydro's Research Division Lights Science to your Future" for high school Data collected from the survey of universities, carried out in the Fall of 1986 has been compared to data collected in 1985. No strong trends were established and participation of young women in Physics at the University level remains low. The Committee continues to maintain interest in continue. An expansion of the membership provinces and organizations is recommended. the issue and the members are willing to to include"corresponding members" from other A continuation of the present mode of operation seems to allow members of the group to focus their efforts in areas of mo3t significance to them. In 1988/89 it is planned to 3urvey the universities again. Another physics Workshop Is planned at York University (contingent on finding funding). There is interest in putting together a directory of women in physics, however this would require funding. The current members of the Committee: Janet Halliwell, Mary-Ann Lister, Ann McMillan, Jim Megaw and Jim Prentice. Jenkins, Mona Jento, also Verna 15 A proposal for a study entitled "Women in Physics - Why Not?" which had been considered by Council was resubmitted to the Science Council with a request for financial support. 8.9 Committee on Undergraduate Student Affairs The Committee's mandate is the encouragement of undergraduate students in physiC3 and their involvement in the CAP, through liaison and support for university physics club3. This support is to include the sharing of ideas and information, affiliate club membership in the CAP, and some financial assistance for club activities as required. 8.10 Radiation Regulations Committee The Radiation Regulations Committee is a standing committee of the C.A.P. which reviews and comments on legislation dealing with radioactive material, radiation emitting or producing devices and guidelines or standards for protection from radiation. Members of the committee have traditionally been Medical Physicists drawn from the Division of Medical and Biological Physics. Since June 1987 the activities have been very limited as the Radiation Regulations, with which this committee has been so actively involved, are still being reprocessed by various government bodies. 8.11 Sub Committee of the Executive on Finance Some consideration was given to changing the pattern of investment of the reserves of the CAP. These considerations were overtaken by the events of last October, so it was recommended that a very conservative policy be continued. After some examination of alternatives it was agreed to recommend that Clarkson Gordon continue as the auditors for the Association. 9. AWARDS COMMITTEE The Awards Committee, chaired by M.P. Bachynski, has recommended that: The 1988 Medal for Achievement in Physics be awarded to Dr. E.W. Vogt, TRIUMF. The 1988 Herzberg Medal be awarded to Dr. F. Wesemael, Université de Montréal. 10. REPORTS FROM REPRESENTATIVES TO OTHER ORGANIZATIONS 10.1 CN<"Vinternational Union of Crystallography At the meeting of the Committee in December 1987, a report on the XIV Congress of the I.U.Cr. was presented by the Chairman. He remarked that the Congress, rather smaller than other recent ones, was very well run. A large Canadian contingent attended, among them the five students who received financial assistance from the Committee. They all presented excellent posters and were seen to be actively involved in discussions. The evening meetings of the General Assembly were attended by the three Canadian delegates, G. Ferguson, J. Trotter and B.M. Powell. The meetings were characterized by a notable lack of discussion. A new Commission of the I.U.Cr. was created for Powder Diffraction and a working group was 3et up to examine the feasibility of merging into a single Commission, the three Commissions which are responsible at present for crystallographic information. The newly formed Asian Crystallography Association was formally affiliated with the I.U.Cr. The next Congress in 1990 will be in Bordeaux and that in 1993 will be in Beijing. The capital in the Trust Fund is intact and it is hoped that financial assistance can he offered to more students for the Bordeaux Congress. At this meeting of the CNC, G. Ferguson retired as Chairman and A. Beachamp, R. Ferguson, G. Bushnell and 0. Knop as members. The new chairman ir. J. Trotter, vice-chairman is B.M. Powell and F. Rochon, P. White, Y. LePage and N. Payne are the new committee members. The low esteem in which the CGSC appears to hold crystallography is exemplified by its classification as a branch of inorganic chemistry for funding purposes. The Committee has written to NSERC suggesting a re-classification scheme for crystallography more appropriate to the actual distribution of the practitioners among disciplines. Concern was expressed about the increasing number of papers published which contain crystallographic data in which the results or data are incomplete, improperly reported or even incorrect. It wag felt that the editorial boards of the appropriate journals should insist on more stringent criteria for the acceptance of such papers. N. Payne agreed to formulate a set of criteria for consideration for the Committee and subsequent distribution to the relevant editorial boards. 10.2 Technical Advisory Committee to AECL on the Canadian Nuclear Fuel Waste Management Program The principal activity of TAC consists of a continuing examination and evaluation of the progress being made in the course of each year in the research relevant to the NFWMP and the preparation of the documentation leading to the Concept Assessment Document (CAD). This activity culminates yearly in the preparation of the TAC Annual Report representing TAC's evaluation of the current status of the program, with recommendations for future work. The Structure of TAC was described in a note in the July 1986 "Physics in Canada" (4_2, 78 (1986)). At present TAC is composed of 13 members nominated by eight technical and professional societies. In its gathering and preliminary evaluation of information on the NFWMP, TAC operates through four subcommittees: 1. Geoscience, 2. Engineered Barriers, 3. Bioscience, and 1. Systems Analysis and Assessment. Of the current 13 members of TAC, each of seven members participates iri the work of one subcommittee which is particularly relevant to his professional discipline. The remaining six, including the two CAP nominees, are each members of two subcommittees. Pryce is a member of the Geoscience, and Systems Analysis groups, and Volkoff is in the Engineered Barriers, and Systems Analysis subcommittees. The information in accumulated by the subcommittees by site visits, attendance at specialized workshops, and study of documentation prepared by AECL. Supplementary information on the relative standing of the Canadian program on the international scene is derived by individual members attending international conferences devoted to various aspects of the NFWM programs of many countries. The subcommittees prepare their draft evaluation reports which are then discussed and agreed upon at meetings of the full committee. Four such TAC meetings of the full committee, each lasting two days, were held in 1987/88. The annual report is then compiled on the basis of the agreed-upon subcommittee submissions by the Chairman and the Science Secretary. At present, work is in progress on the ninth annual report, TAC-9. TAC-8 and earlier reports can be obtained from the Chairman of TAC, Dr. L.W. Shemilt, c/o McMaster University, General Sciences Building, Room 216, Hamilton, Ontario, L8S 4K1. In our note in "Physics in Canada" in July 1986, we indicated that the formal Concept Assessment Document was, at that time, scheduled for completion in the fall of 1988, with public hearings beginning in 1989. Because of some budget restrictions imposed by the Government since then, and the lack of action to date by the Government in naming an Environmental Assessment Panel to initiate the public review process, the scheduled date for the completion of CAD has been delayed to 1991, with public hearings to follow. There has been considerable discussion within TAC concerning the necessity of maintaining continuity of the committee's collective comprehensive grasp of the material to be embodied in CAD. This requires the retention on the committee of a number of its present members until the public review is over. At the same time, it is realized that injection of new blood into TAC is highly desirable. Both aims can be achieved by scheduling new appointments to TAC in such a manner that an incoming new member overlaps for at least a year with current members of his discipline prior to their retirement. A TAC recommendation to this effect has been accepted by AECL. Of the two CAP nominees who have been serving on TAC since its inception in 1979, Pryce's current term expires in July 1988, and Volkoff's in 1989. Pryce has indicated his willingness to be renominated, while Volkoff has expressed to the Chairman his wish to leave the Committee on the expiration of his present term. A request to CAP to nominate a replacement has gone forward from TAC, via AECL. Early responses by CAP will ensure an overlap with both CAP nominees on TAC. We have given some thought as to the desirable qualification for CAP nominees in order that they can serve on the committee with maximum effectiveness. The role of the physicists on TAC is somewhat special. The fact that mathematics and physics are basic disciplines whose use can hardly be avoided in any engineering or scientific enterprise, results in physicists becoming involved as connecting links between more specialized investigations in the waste disposal research program. The problem of the permanent disposal of highly radioactive waste is one which has no exact precedent in technology. It calls for an evaluation of situations in which a considerable number of factors interact under conditions which have not been encountered in quite the same relation before. The nominees of CAP can best serve the aims of TAC if they can gather together the relevance of results from widely different areas of investigation, and so assist in harnessing apparently diverse activities for a common purpose, rather than by exercising their expertise in any particular field of physics. The analysis of general principles is, at the present time, as urgently required as is the adaptation of known techniques to possible lines of attack on new but well recognized problems. The present. AECL research makes extensive and sophisticated use of computation. While TAC does have one member nominated by the Canadian Information Processing Society who is highly knowledgeable about the more sophisticated aspects of computerization, it would seem desirable for the next CAP nominee to have some personal experience in the use of large-scale computing, if that could be combined with an appreciation of the wide diversity of the problems facing the NFWMP, and we so recommend to Council. With respect to increasing the visibility offer the following suggestions: of the activities of the CAP nominees on TAC, we Schedule an invited paper on the current status of the Canadian NFWMP at the 1989 CAP annual Meeting bringing up-to-date the report Pryce gave at the Halifax Annual meeting in 1981. Possibly have or 1990. one of the CAP nominees on TAC serve as a CAP lecturer across Canada in 1989 Publish a sequel to the 1986 becomes a public document. article in "Physics in Canada" at the time the formal CAD GROUP LIFE INSURANCE The revised Group Insurance Plan continues to be offered to members. The Term Life and Health improvements include a new rate schedule for Member term Life and Spouse Term Life, with rates for males and females, and special non-smoker rates, as well as increases in the maximum for Member Term Life and Spouse Term Life coverage, the maximum for Accidental Death and Dismemberment, coverage for Dependent Children's Term Life, the maximum for Income Protection Insurance coverage, and the introduction of Office Overhead Expense Insurance. In addition portable. to low premium rates, the plan has the added advantage of being completely 17 12 . NEW EXECUTIVE AND COUNCIL: 1988-89 Suggestions were solicited for nominations by the Nominating Committee from members of the Executive and Council. Nominations were proposed for all vacant offices by the Nominating Committee and additional nominations were solicited from the membership at large. The list of nominations for the various offices, for which no additional nominations were received, follows. 1988-89 COUNCIL •President *Past President •Vice-President •Vice-President Elect •Honorary Secretary-Treasurer Director - Full Members Director - Affiliate Members Director - Student Members Director - Corporate Members Division L.,G. Caron P.,A. Egelstaff A. A. Offenberger R. L. Armstrong R. L. Clarke R. C. Barber P. Charlesworth L. Gates R. J. Kriegler Univers ité de Sherbrooke Univers ity of Guelph Univers ity of Alberta Univers ity of Toronto Carleto n University Univers ity of Manitoba Energy 1Mines and Research Dalhous ie University Bell No rthern Research Chairmen^ Aeronomy S Space Physics Atomic & Molecular Physics Canadian Geophysical Union Condensed Matter Physics Medical & Biological Physics Nuclear Physics Optical Physics Particle Physics Phyr:ics Education Plasma Physics Theoretical Physics Industrial & Applied Physics Surface Science Councillor3/Conseil1ers British Columbia 1) D. Boal 2) R. Keeler Simon Fraser University University of Victoria Alberta 1) W.C. Olsen 2) H.A. Buckmaster University of Alberta University of Calgary Saskatchewan and Manitoba 1) G.J. Lolos 2) J. Vail University of Regina University of Manitoba Ontario D G . W . F . Drake 2)F.S. Razavi University of Windsor Brock University Ontario - Central and North 1)D.C. Bailey 2)P. Kirkby University of Toronto Ontario Hydro Ontario - East 1)B.K. Mukherjee 2)P.A. Kalyniak Royal Military College, Carleton University Québec - Nord et Ouest 1)A. Yelon 2)M. Sutton Ecole Polytechnique McGill University Québec - Sud et Est 1)M. Piché 2)R. Marchand Université Laval INRS - Energie New Brunswick & newfoundland 1)D.H. Rendell 2)W.R. Ross Memorial University University of Nova Scotia and Prince Edward Island 1)G. Stroink 2)Y.N. Joshi Dalhousie University St Francis Xavier University At Large 1)H. Buijs 2)A.C. McMillan 2)C. Samson Bomem Inc. Ontario Hydro University of Toronto Southwest Editor - Candian Journal of Physics: R. Nicholls, York University Editor - Physics in Canada/La Physique au Canada: J. Rolfe, Bank of Canada, Ott. Executive Secretary - Secrétaire exécutif: M.L. Jento • Member of Executive Committee •• To be elected by their respective (1) Term ends June 1989 (2) Term ends June 1990 Divisions awareness to a whole nation is pitifully small. However, their recent announcement by The Prime Minister, of his commitment to Science and Technology, his recognition of its importance to Canada's future as a trading nation, and his commitment of 1.3 billion dollars represents a major change in policy. W e will have to see if this is a lasting change. Another factor contributing to this lack of public awareness for Canadian scientific accomplishment is Canada's history of dependence on our natural resources. Up until now, we have been able to maintain our seemingly advanced social level by virtue of an incredible bounty of natural resources. However, this situation is fast changing. The copper we mine that once went into telephone lines, will soon be replaced by threads of glass. Soon many of the resources sold as raw material around the w o r l d which have supported our extravagant standard of living will no longer be needed in vast quantities. Special products from laboratories will be replacing them. What then? Furthermore, unlike the traditional third w o r l d country, we have a very high level of literacy and affluence. However, like many banana republics, we sell our basic resources abroad and we do very little research to develop these resources into marketable products. Resource industries now realize that this situation must change if they are to prosper. David Suzuki, w h o has received two major prizes as a science communicator, argues that "Canadians live under the remarkable delusion that we are a technologically advanced people but that everything around us denies that assumption." In many respects, what David says is true — our consumer scientific goods are largely bought from abroad and the few that have the "Made in Canada" stamp are more often than not produced by branch plants of a multinational company which has its home abroad. However, it is uplifting to be able to note that there are exceptions, such as the Canadarm which was largely invented at NRC and manufactured by Spar Aerospace, a Canadian shareholder-owned company. In addition, the spinoff companies from Northern Telecom, like Mitel, and other knowledge-based industries in Canada's CAREER silicon valley north and silicon valley north west are exciting. But, w h o but those w h o belong to the " i n " group know of these things? Certainly not the majority of the public — not the lawyers, and businessmen and women, who, for the most part, represent us in our parliaments. Parliamentarians, like ex-professors Bill Tupper and Howard McCurdy understand, but they are in the minority. I am however encouraged by the recent development of some selected technologies here, and by the number of physicists w h o have successfully taken what they have found in the laboratory to the market place. The field of laser technology is an example, where people like Jacques Bouleau, Boris Stoicheff, Steve Wallace, A.I. Carswell, Morel Bachynski and John Polanyi, among others, have made their mark. It is also uplifting to see fellow physicists following in the footsteps of David Suzuki and making the effort to share with the public their experiences and commitments as scientists. In addition, many colleagues in the world of science are now speaking out on matters related to science policy and science in society — either independently or through groups such as Science for Peace and the Canadian Council of Scientists and Scholars. The response shown by educators and provincial governments to the Science Council report on education is encouraging. Complementing this, I can see clearly the value of institutions such as the National Museum of Science and Technology, as an educational institution, helping young children, their parents and grandparents understand the importance of science, of physics, in supporting technological development and strengthening our culture. To respond to the question raised by the title of this article — without a past, or for that matter a present, does Canada's youth have a future in physics? The answer, in my opinion, is no — not until all Canadians know about what we have been able to accomplish. We, as physicists, and scientists, must w o r k together to market ourselves and transmit the excitement of our accomplishments to our Canadian community. OPPORTUNITIES C A P offers a service to b r i n g together carter seekers and employers in the physical sciences. Interested candidates should request an inform a t i o n f o r m and return it to Canadian Association of Physicists I 5 I Slater St., Suite 903 Ottawa, Ontario, K I P 5 H 3 This i n f o r m a t i o n will be kept on file and made available to all prospective employers. Employers should contact the above address and provide a brief description o f the position and the skills required. Xa Physique au Canada juillet 1988 109 CAP Affairs/Affaires de l'ACP MESSAGE D U NOUVEAU PRESIDENT Je constate qu'il m'a fallu q u e l q u e deux ans à l'exécutif de l'Association pour pouvoir apprécier t o u t ce que l'A.C.P. fait p o u r ses membres et, surtout, pour la c o m m u n a u t é de physique. O n parle souvent de problème de visibilité de l'A.C.P. : visibilité politique, visibilité scientifique, visibilité publique. Je dois avouer que même les membres d u conseil ont régulièrement besoin de munitions lors des campagnes de recrutement p o u r vendre notre Association à des n o n membres. Faut-il croire que même nos membres sont mal informés sur ce que fait l'A.C.P.? Je crois que l'information est là puisqu'en lecteur aguerri de la Physique au Canada, que tous nos membres reçoivent d'ailleurs, je sais l'y retrouver. Mais voilà bien une partie du problème; c'est qu'il faut la vouloir cette information p o u r la trouver. Elle n'arrive pas en pleine face des gens. C'est dans ce sens qu'il y a problème de visibilité : c'est un problème de marketing de l'information. Et plus j'y pense, plus cela m'apparaît normal. Il est en effet normal que la masse des physiciens canadiens aient autre chose à faire que de se préoccuper des aspects plus politiques o u politicailleux de la science. N'est-ce pas plutôt leur j o b d'être des professionnels compétents de physique, de faire de la b o n n e recherche, de bons enseignements o u de bonnes études? C'est d'ailleurs pour cela qu'il y a des associations professionnelles et des sociétés savantes afin que celles-ci s'occupent justement de ces aspects disons socio-politicoscientifiques. Et c'est bien à ce niveau que je me trouve en ce m o m e n t avec une poignée de collègues sensibilisés et dévoués qui, Dieu merci, seront là pour m'épauler pendant m o n mandat. Mais q u ' e n était-il il y a une dizaine d'années? Je dois avouer que ces considérations étaient très loin de m o n quotidien. Car il y a aussi un apsect maturité (vieillesse peut-être) qui intervient dans la quête d'information. Et ceci rejoint le p r o b l è m e de recrutement, p r o b l è m e aigu qu'a bien indentifié m o n prédécesseur P. Egelstaff. En effet, pour que l'A.C.P. renseigne mieux, pour qu'elle ait plus d'activités sur q u o i renseigner, il faut des sous. Vous me direz que la cotisation est assez élevée et c'est donc qu'il faut plus de membres. J'accorderai la priorité cette année à la politique scientifique, ce qui aidera à avoir d u matériel pour renseigner et aider au recrutement, et à la c o m m u n a u t é des étudiants gradués, ce q u i nous apportera plus de membres à long terme. Je crois que c'est là un investissement pour l'avenir non seulement de la physique mais aussi de l'A.C.P.. Je vais travailler en ce sens avec la nouvelle représentante des étudiants gradués au conseil, M m e Claire Samson. Q u o i d'autre: l'A.C.P. appuiera ceci par une bonne campagne de recrutement dans tous les secteurs servant aussi de campagne d ' i n f o r m a t i o n avec l'aide de A. Offenberger et R.L. Armstrong, je suivrai de près le rapprochement avec les professeurs du secondaire qu'a amorcé la division d'éducation de l'A.C.P. en Ontario. La liste des choses à faire est très longue et je dois en laisser pour mes successeurs. Je termine en vous disant q u e je suis enthousiaste et optimiste malgré ce que j'ai dit ci-haut et que je vais travailler très fort pour vous tous et p o u r la communauté. Division of Condensed Matter Physics The activities of the Division centered essentially around the Fall Symposium in 1987, and the CAP Congress 1988 at the University of Montreal. The Fall Symposium 1987 had as its topic the presently very active field of high T c superconductivity. It was held at McMaster University, Hamilton, Ontario, from 30-31 O c t o b e r , 1988, under the title "Canadian Research in High Temperature Superconductivity". The organizer of this symposium was J. Berlinsky. The symposium comprised both invited and cont r i b u t e d talks, and contributions f r o m all Canadian groups active in this field were received. Invited speakers were R. M c K i n n o n , NRC, L. Greene, Bell Communications Research Laboratories, S. Kivelson, SUNY, Stony Brook, J. Hulm, Westinghouse, and D. Sharma, Electric Power Research Institute. The symposium was attended by about 160 persons. At the 1988 CAP Congress at Montreal, our division organized four special sessions, these are on the f o l l o w i n g topics: High T c superconductivity (theoretical), high T c superconductivity (experimental), Superfluid 3 He and related subjects, Disordered and amorphous solids. A total of thirteen speakers were invited to speak at these sessions. For the fall symposium 1988 it is proposed that a second conference on high T c will be held. The title of this conference will be "Second Annual Symposium on Canadian Research o n High T c Superconductivity". The organization of this symposium is in the hands of S. Gygax (Simon Fraser), J. Berlinsky (McMaster), and Frank Chu (Ontario Hydro). The conference will be held Thursday to Saturday, O c t o b e r 2729,1988, in a hotel in d o w n t o w n Vancouver. The symposium will be sponsored by Ontario Hydro, and it is suggested that CAP t h r o u g h our division should also sponsor this symposium. Selections of the best annual paper in CJP o n condensed matter physics were made both for 1986 and 1987. The c o m m i t t e e for this was u n d e r t h e chairmanship of Allan Jacobs (Toronto), and included also Allan MacDonald (Indiana) and M. Sutton (McGill). The paper chosen for 1986 is by S. Fujiki and D.D. Betts o n "Zero-temperature properties of q u a n t u m spin models o n a triangular lattice I: the S - 1/2 XY m o d e l " , Can. J. Phys. 64, 876 (1986). The best paper chosen for 1987 is by R.L. Armstrong, R.M. Morra, I. Svare, and B.M. Powell o n "Temperature-dependence of the structure of the antifluoride K 2 Os Cl 6 : evidence for precursor tetragonal clusters near T c " , Can. J. Phys. 65, 386 (1987). The recipients of these awards will be presented w i t h certificates at the annual meeting of DCMP. It is suggested that the practice of making these awards should be continued. A new, and geographically more broadly based c o m m i t t e e will be chosen at the annual meeting. Contact w i t h industry and the broader public has been most evident t h r o u g h the various activities s u r r o u n d i n g the field of high T c superconductivity. As this field continues to draw very strong interest, w e should perhaps think of separating its presentation from those of other, equally important areas in condensed matter physics. In this context, one should offer a different field for the Fall Symposium in 1989, and hold specialized c o n f e r e n c e s o n h i g h T c s u p e r c o n d u c t i v i t y separately. The Chairman of the division for 1988/89 w i l be Gwyn Williams (Manitoba), and Tom Timusk of McMaster University has agreed to stand for election as Vice-Chairman. J.P. Franck, Chairman Division of Condensed Matter Physics, CAP Laurent. G. Caron 110 Physics in Canada July 1988 Division of Plasma Physics CAP CONGRESS The CAP Congress was held in Toronto, where w e had one invited session and t w o c o n t r i b u t e d sessions (one oral and one poster). The three invited presentations were by Henri Pépin, INRS-Energie ("Laser-Created X-Ray Sources and Microlithography"), Stephen Bodner, NRL ("Induced Spatial and Temporal Incoherence in Laser Fusion") and C u e n t h e r Pacher, IREQ ("Premier Fonctionnement du Tokamak de Varennes"). In addition, there was a presentation by Charles Daughney from the NFP on the "Future for Fusion Power" in the invited session of the Division of Industrial and A p p l i e d Physics, and a presentation by Richard Bolton, director of the Tokamak de Varennes, on "Le Tokamak de Varennes" at a plenary session. W e certainly got good exposure for fusion at this meeting. There were 14 c o n t r i b u t e d papers, w h i c h is about normal for our division, but w h i c h is m u c h less than I w o u l d hope to have. Another discouraging aspect is the paucity of presentations by graduate students. I hope that both of these situations will improve, since I regard the annual CAP Congress as a g o o d f o r u m for exchange between Canadian plasma physicists. NSERC STRATEGIC GRANTS FUNDING The elimination of ENERGY as one of the themes for the Strategic Grants program for 1987-88 was demoralizing for the groups w o r k i n g in fusion research, and disastrous for the U. of Saskatchewan g r o u p w h o lost about half of their funding. Since NSERC is reevaluating the Strategic Grants program, it was felt necessary to have the opinions of the Fusion c o m m u n i t y on record to make the case for continued, substantial f u n d i n g . A meeting was organized by Allan Offenberger at the University of Alberta at the end of January 1988, w h e r e representatives of groups across the c o u n t r y discussed the situation, and planned the submission of a d o c u m e n t to NSERC Council. I w o u l d like to thank Allan for the tremendous amount of w o r k he put into the organization of the meeting and the preparation of the d o c u m e n t , entitled "Fusion Research Funding-University Research and the National Fusion Program". GRADUATE STUDENTS TRAVEL FUND W e have again sollicited contributions f r o m various companies and organizations for this fund, w i t h the aim of increasing the participation of graduate students at the annual congress. Given the drive by the CAP to recruit more Corporate members (and hence slimmer pickings for our division) and the rather p o o r response f r o m the students, I think it appropriate to reevaluate this effort. I w o u l d like to thank Claude Boucher for his efforts in setting up this f u n d and for his w o r k for the division. B.L. Stansfield Chairman, Division of Plasma Physics Division de physique des plasmas CONGRES DE L'ACP Le congrès de l'ACP a été tenu à Toronto, où il y avait une session invitée et deux sessions contribuées (une orale et une affiche). Les trois présentations invitées étaient par Henri Pépin, INRS-Energie ("Laser-Created X-Ray Sources and Microlithography), Stephen Bodner, NRL ( " I n d u c e d Spatial and Temporal Incoherence in Laser Fusion") et Guenther Pacher, IREQ ("Premier Fonctionnement du Tokamak de Varennes"). En plus, il y avait une présentation de Charles Daughney d u NFP sur le "Future for Fusion Power" dans la session invitée de la Division de Physique Industrielle et Appliquée, et une présentation de Richard Bolton, directeur d u Tokamak de Varennes, sur "Le Tokamak de Varennes" à l'assemblée plénière. Il y avait certainement de la b o n n e publicité pour ia fusion à Toronto. Il y avait un total de 14 présentations contribuées, ce qui est à peu près normal pour notre division, mais ce qui est beaucoup moins que je n'aurais espéré. Un autre aspect décourageant est le faible n o m b r e de présentations des étudiants gradués. J'espère que cette situation s'améliorera, parce que je crois que le congrès annuel de l'ACP nous d o n n e un bon f o r u m pour des échanges entre les physiciens canadiens qui travaillent en plasma. SUBVENTIONS THÉMATIQUES CRSNG L'élimination de ENERGIE c o m m e thème des Subventions Thématiques pour l'année 1987-88 a été démoralisante pour les chercheurs dans le domaine de la fusion, et un désastre pour le groupe de l'U. de Saskatchewan qui a perdu la moitié de son financement. Etant donnée que le CRSNG est entrain de réévaluer le programme de Subventions Thématiques, il a été jugé nécessaire de faire connaître les opinions des chercheurs dans le domaine de la fusion sur le besoin d ' u n financement assuré. Une recontre a été organisée par Allan Offenberger à l'Université de l'Alberta à la fin janvier 1988, o ù des représentants de différents groupes à travers le pays ont discuté la situation et ont planifié la préparation d ' u n d o c u m e n t pour soumission au Conseil du CRSNG. Je voudrait remercier Allan pour l'énorme travail qu'il a fait en organisant la réunion et en préparant le d o c u m e n t , intitulé "Fusion Research Funding-University Research and the National Fusion Program". FOND DE DÉPLACEMENT POUR LES ÉTUDIANTS GRADUÉS Encore cette année nous avons sollicité des contributions de divers compagnies et organisations pour ce fond, avec le but d'augmenter la participation des étudiants gradués au congrès annuel. Etant donnée l'effort de l'ACP p o u r recruter d'autre membres Corporatifs (ce qui laisse moins pour notre division) et la mauvaise réponse des étudiants, je pense qu'il faut réévaluer cet effort. Je voudrais remercier Claude Boucher p o u r ses grands efforts en établissant ce f o n d et pour son travail pour la division. B.L. Stansfield Président, Division de Physique des Plasmas Division of Industrial and Applied Physics The Division organized three sessions at the 1987 congress in Toronto. These were on future directions for nuclear power, advanced industrial materials and on the technology of c o m m u n i c a t i o n s devices. Sessions o n the application of particle beams, and the instrumentation and techniques of measurement, are planned for the Montreal meeting. Two newsletters were mailed to members. The Division was responsible for the organization of the f o u r t h in the series of C.A.P. Industrial Courses. This took the f o r m of a w o r k s h o p on Advances in Sensors and their Application, and was held at the Industrial Materials Research Institute (NRC) near Montreal from 17-19 May. The workshop was organised by George Mackenzie, Marc Dufour, Barry Paton, Jean Bussière and Richard C o b b o l d . The CAP office undertook responsibility for photocopying, mailing, registration and accounting. Invaluable secretarial and other assistance was given by the host institute (IMRI) and TRIUMF. Peter Elgelstaff, John Lit, and Henry van Driel provided help and advice. Last, but certainly not least, w e gratefully acknowledge a grant f r o m NSERC towards speaker expenses. The w o r k s h o p was Xa Physique au Canada juillet 1988 111 attended by more than 65 persons and many participants made special efforts to express their satisfaction w i t h the program. Hence it c o u l d be regarded as a success. The program format differed somewhat f r o m previous industrial courses: An overview of three separate but related technologies, fibre optic sensors, microelectronic sensors and actuators, industrial systems and robotics, was presented on consecutive days, rather than having one technology dealt w i t h in depth. The basic principles o c c u p i e d the m o r n i n g sessions, and a series of case studies exemplified applications in the afternoon. Because of this, although the attendance was only slightly higher than at previous courses, the participants came f r o m many more (38) institutions and represented many different industries and disciplines. W h i l e the course was successful, it is felt that these affairs are t o o onerous for a single division. Future courses should be selected and the structure formulated by a standing CAP c o m m i t t e e and CAP members (from several divisions) near the w o r k s h o p location should be responsible for the rest of the arrangements. A brief career profile of L o m e Whitehead, inventor of the light pipe, chairman of TIR Systems Ltd., and previous DIAP prize winner, was submitted to CAP for inclusion in the latest version of the high schools careers booklet, as an example of an entrepreneurial physicist. The DIAP prize for innovation in industrial physics was not offered for c o m p e t i t i o n this yeanin part, because of the w o r k involved in organizing the workshop. Several efforts were made t o expand our network of contacts. Some may, in time, result in new members or corporate members for CAP and DIAP. The w o r k s h o p attracted many; 80% of the attendees, w h o were not CAP members. The DIAP congress program was circulated among individuals and laboratories active in the topics covered, the intent being t o encourage c o n t r i b u t e d papers and the o p i n i o n of a congress session as a national micro-topical meeting. The program of invited speakers was mailed t o selected, nonpractising, physics graduates living in the Montreal area together w i t h the suggestion that they may be interested in attending the more general talks. The DIAP chairman met w i t h Daniel M u r n i k , Chairman of the C o m m i t t e e on Applications of Physics of the American Physical Society. M u r n i k felt that this c o m m i t t e e w o u l d be interested in sharing the planning of applied physics sessions w i t h DIAP at future joint meetings of the CAP and the APS. The Division participated in the corporate members meeting held in T o r o n t o in April. G.H. Mackenzie, Chairman Division of Industrial and Applied Physics News / Nouvelles Buyers Elected Fellow of Royal Society of Canada Dr. W.J.L. (Bill) Buyers has b e e n elected t o Fellowship of the Royal Society of Canada, in recognition of his outstanding accomplishments in research into condensed matter physics. His published w o r k includes some 150 papers in the o p e n literature and several additional u n p u b l i s h e d reports o n an unusually w i d e range of topics, i n c l u d i n g experimental and theoretical studies of magnetic excitations and lattice vibrations in both o r d e r e d and d i s o r d e r e d materials, 112 Physics in Canada July 1988 heavy f e r m i o n superconductors, quasi-one-dimensional magnetic crystals, and structure determinations of solids and liquids. In these studies he has for the most part e m p l o y e d the techniques of neutron elastic and inelastic scattering, as part of the w o r l d - r e n o w n e d Chalk River g r o u p originally established by Professor Bertram N. Brockhouse. A m o n g his many tasks and accomplishments as an excellent "citizen of science", Dr. Buyers has served as chairman of the Divisions of Condensed Matter Physics and of Theoretical Physics of the Canadian Association of Physicists, and has been chairman and CAP representative of the Canadian National Committee of the International U n i o n of Crystallography. He continues to serve on the Physics Grant Selection Committee of NSERC and o n the Magnetism C o m m i t t e e of IUPAP. He is a Fellow of the American Physical Society and of the Institute of Physics, an Adjunct Professor of Physics at the University of Toronto, and the 1986 recipient of the Rutherford Medal in Physics. E.W.R. Steacie Memorial Fellowship Dr. Scott D. Tremaine, University of Toronto, has been awarded a 1988-89 E.W.R. Steacie Memorial Fellowship. Bomem Inc, a leading designer and builder of infrared spectroscopy instruments, reports that it will inject more than 40% of its recent $3 million public offering into R&D. The company has budgeted 9% of sales of $1.2 million into p r o d u c t development this year. Its 45 scientists, researchers and technicians undertake joint development w i t h industrial and government labs and universities. Obituaries / Necrologie Professor R.M. Hobson, Professor of Physics at York University and Chairman of the Department of Physics f r o m 1969-1979, died suddenly o n 21st May 1988. Robert Marshall Hobson was b o r n in Belfast, N o r t h e r n Ireland in 1926 and educated at the Methodist College, Belfast. In 1943 he was awarded a Foundation Entrance Scholarship t o Queen's University, Belfast, but enlisted in the Royal Artillery, was commissioned and served as an Artillery Officer in the Far East until 1948. He returned to QUB, graduated w i t h First Class Honours in physics in 1951 and obtained his PhD in 1954. He was a Research Fellow w i t h Sir Harrie Massey at University College, London until 1957 and then j o i n e d Clarke Chapman and Company Ltd (later to become the Nuclear Power Plant Company), as Research Manager. In 1964 he returned t o Belfast as Lecturer in Physics and was appointed Reader in 1967. He came to York as Chairman in 1969. He brought w i t h h i m a fairly large scale research operation including a n u m b e r of graduate students, a technician and a great deal of equipment w h i c h included a shock tube fashioned f r o m a naval gun barrel. He had not been long at York before he suffered his first major heart attack and a succession of these, c o u p l e d w i t h a number of family tragedies w o u l d have crushed someone of lesser fibre. Bob soldiered on, devoting his considerable energies to g u i d i n g his numerous graduate students and, in addition, d o i n g a full teaching load. His personal life u n d o u b t edly suffered and his first marriage to Jenny sadly ended in divorce. Hobson's research interests were w i d e and varied. In the early days of nuclear power he was responsible for solving vibration fatigue problems o n the heat exchangers of the Latina Nuclear Power Station w h i c h had failed under pre-commissioning tests. In 1961 he started an extensive programme on ionisation in shock heated gases w h i c h has c o n t i n u e d to the present. His success as a physicist can perhaps best be judged by the n u m b e r of his former graduate students w h o gathered at his funeral to pay their respects to someone w h o had been instrumental in shaping their careers. O n e of t h e m travelled from Texas to d o so. He had a bluff but g o o d natured manner and my wife and I will always be grateful for the great personal kindness w h i c h he and Jenny showed us w h e n w e arrived in York in 1971. He played a major role in shaping the Department of Physics at York and this was recognised, o n his retirement f r o m the Chairmanship in 1979, by the instit u t i o n of the R.M. Hobson Prize. All of us will miss him. He is survived by his former wife Jenny, by the three surviving children of that marriage, Paul, Fiona and Mary, by seven grandchildren and by his second wife Mamie. O u r sympathy goes out t o all of them. WJM Calendar / Calendrier W.B. Lewis Memorial Lecture As a t r i b u t e t o Dr. W i l f r e d Bennet Lewis, the Chalk River Nuclear Laboratories is instituting a commemorative lecture series featuring p r o m i n e n t scientists. The first W.B. Lewis Memorial Lecture will be given by chemistry Nobel Laureate, Prof. John Polanyi of the University of T o r o n t o speaking on the topic of the responsibility of the scientist. " I n an age of science, what is the responsiblity of the scientist to society?" The lecture will be given in Deep River, Ontario on Friday, O c t o b e r 21, 1988 and will be f o l l o w e d by a reception. Admission is free and is open to everyone. Dr. W.B. Lewis died in January, 1987. He was responsible for the scientific d i r e c t i o n of the Canadian nuclear power program f r o m 1946 t o 1973 and was widely k n o w n as the father of the C A N D U nuclear power reactor. After retirement, he c o n t i n u e d to w r i t e and speak o n nuclear energy as Distinguished Professor of Science at Queen's University, Kingston. He received many awards and honours i n c l u d i n g the prestigious US Department of Energy Enrico Fermi Award in 1981. Tickets and further information about the public lecture can be obtained f r o m the Public Affairs Branch, Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario, KOJ 1J0. Telephone (613) 584-3311. TASCC WORKSHOP '88, Chalk River Nuclear Laboratories, August 15-18, 1988. A w o r k s h o p on areas of heavy-ion nuclear physics under investigation at the Tandem Accelerator S u p e r c o n d u c t i n g Cyclotron (TASCC) facility at Chalk River Nuclear Laboratories will be held August 15-18, 1988 at Chalk River. The program will centre o n three main topics: a) heavy-ion reaction mechanisms, b) nuclear structure at high spin, and c) fundamental /3-decay properties. The format of the meeting allows time for formal talks and informal talks among participants as well as w o r k s h o p sessions under the leadership of a discussion chairman. The invited speakers are J. Dudek (University of Tennessee), F.S. Stephens (Berkeley), R.C. Stokstad (Berkeley), D. Boal (Simon Fraser), A. Sirlin (New York), P. Barker (New Zealand) and B. Muller (Frankfurt). The discussion chairmen are B. Herskind (Copenhagen), J. Barrette (McGill University) and J.C. Hardy (Chalk River). Further information can be obtained from M a l c o l m Harvey, Organizing Committee Chairman, telephone (613) 584-3311, ext. 4072, or Bitnet 01783 @ AECL-CR. 35TH CANADIAN SPECTROSCOPY CONFERENCE/ 35IEME CONGRÈS CANADIEN DE SPECYROSCOPIE, Carleton University C o m m o n s Building, Ottawa, Ontario 8, 9,10 August 1988. PROGRAM & CONFERENCE CHAIRMEN C.A. Neville C.L. Chakrabarti Health and Welfare Canada Chemistry Dept. Banting Bldg., Tunney's Pasture Carleton University Ottawa, ON, K1A 0L2 Ottawa, O N , K1S 5B6 (613) 957-1067 (613) 564-5685 SCIENTISTS A N D JOURNALISTS: BRIDGING THE GAP, University of Calgary, September 23 & 24, 1988. For further information contact: Dr. E. Einsiedel or Marian Davis Graduate Program in Communications Studies The University of Calgary 2500 University Drive N.W. Calgary, Alberta Tel: (403) 220-6357 RARE DECAY SYMPOSIUM, TRIUMF, November 30 — December 3, 1988. For further information contact any one of the J.-M. Poutissou JMP @ D. Bryman DOUG @ J. Ng MISERY @ T. Numao TOSHIO @ organizers: TRIUMFCL TRIUMFCL TRIUMFCL TRIUMFCL Address TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T 2A3 Tel: (604) 222-1047 FAX: (604) 222-1074 TELEX: (0)-4508503 Xa Physique au Canada juillet 1988 113 Corporate Members/Membres Corporatifs Canadian Association of Physicists/Association canadienne des physiciens The Corporate Members of the Canadian Association of Physicists are a g r o u p of corporations, laboratories and institutions w h o t h r o u g h their membership support the educational activities of the Association. Les Membres corporatifs de l'Association Canadienne des Physiciens sont un groupe de corporations, laboratoires o u institutions qui supportent financièrement les activités éducatives de l'Association. The entire proceeds of corporate membership c o n t r i b u tions are paid into the CAP Educational Trust Fund and are tax deductible. Les revenus de leurs contributions déductibles aux fins d ' i m p ô t sont entièrement versés au Fonds Educatif de l'ACP. ALCAN INTERNATIONAL LTD. ALLAN CRAWFORD ASSOCIATES LTD. ANATEK ELECTRONICS INC. APTEC ENGINEERING LIMITED ATLANTIS AEROSPACE CORPORATION ATMOSPHERIC ENVIRONMENT SERVICE ATOMIC ENERGY OF CANADA LIMITED BELL-NORTHERN RESEARCH LTD. CAE ELECTRONICS LTD. CANADIAN INDUSTRIAL INNOVATION CENTRE/WATERLOO COMINCO LTD. ELECTRONIC MATERIALS CTF SYSTEMS INC. EALING SCIENTIFIC LIMITED EDWARDS HIGH VACUUM (CANADA) LIMITED EG & G INSTRUMENTS HYDRO-QUÉBEC LEIGH INSTRUMENTS LIMITED LINEAR TECHNOLOGY INC. LUMONICS INC. MITEL CORPORATION MOLI ENERGY LIMITED MPB TECHNOLOGIES INC. NATIONAL OPTICS INSTITUTE ONTARIO HYDRO OPTECH INCORPORATED OPTO ELECTRONICS INC. POLYSAR LTD. QUEEN'S UNIVERSITY RAYON ICS INC. RCA INC. SOUTHERN ALBERTA INSTITUTE OF TECHNOLOGY SPAR AEROSPACE LIMITED SRP CONTROL SYSTEMS LTD. TASMAN SCIENTIFIC INC. TECHNICAL MARKETING ASSOCIATES LIMITED TRIUMF VG INSTRUMENTS CANADA INC. UNIVERSITY OF WATERLOO XEROX RESEARCH CENTRE OF CANADA The Canadian Association of Physicists cordially invites interested corporations and institutions to make applicat i o n for Corporate membership and will w e l c o m e the inquiries addressed to the Executive Secretary. L'Association Canadienne des Physiciens invite cordialement corporations et institutions à faire partie des Membres Corporatifs. Renseignements auprès du Secrétaire Exécutif. CANADIAN ASSOCIATION OF PHYSICISTS/ASSOCIATION CANADIENNE DES PHYSICIENS 151 Slater, Suite 903 Ottawa, Ontario K1P 5H3 114 Physics in Canada July 1988 Books Received/Livres reçus The following books have been received for review. Readers are invited to write reviews of books of interest to them. Books may be requested from the book review editor G.R.Hebert: BITNET:"PHYSCAN@YUSOL" or at Department of Physics, York University, 4700 Keele St., North York, Ontario, M3J 1P3. Tel: 1-416-736-2100 ext 3837. 4 0 Fundamental Area of Phenomenology ELECTRON LIQUID THEORY OF NORMAL METALS, ( V . 174 Supplemental Vol. 2), Proceedings of the Lebedev Physics Institute, by V.P Silin, ed., Kevin S. Hendzel, transi., Nova Science Publishers, 1988, pp viii+241. ISBN 0-941743-19-5, QC176.8.F4T4613. Price: U.S.$ 89.00. 00 General ASPECTS OF SYMMETRY, Selected Erice lectures, by Sidney Coleman, Cambridge University Press, 1988, pp xi+ 402. ISBN 0-521-31827-0, QC793.3H5. Price: U.S.$ 27.95 pbk. FOUNDATIONS OF COLLOID SCIENCE, Vol.1, by Robert J. Hunter, Oxford University Press, 1987, pp xi+673. ISBN 0-19-855188-6, QC549.H94. Price: Can.$ 209.95. COLLIDER PHYSICS, Frontiers in Physics Lecture Series, by Vernon D. Barger and Roger J.N. Phillips, Addison-Wesley Publishing Company, 1987, pp xxi+592. ISBN 0-201-05876-6, QC793.2.B37. Price: U.S.$ 44.95. LASER-INDUCED RAMAN SPECTROSCOPY IN CRYSTALS AND GASES, Proceedings of Institute of General Physics, Academy of the Sciences of the USSR, Vol. 2, by P.P Pashinin, ed., Kevin S. Hendzel, transi., Nova Science Publishers, 1988, pp ix+215. ISBN 0-941743-13 -6, QC176.8.06L3913. Price: U.S.$ 58.00. ELECTROMAGNETIC FIELDS AND WAVES, by Paul Lorrain, Dale P. Corson and FranÂois Lorrain, W.H. Freema n and Company, 1988, pp xiii+754, ISBN 0-716-71823-5; (0-716-71869-3 pbk.), QC665.E4L67. Price: U.S.$ 42.95 MODERN TECHNIQUES OF SURFACE SCIENCE, by D.P. Woodruff and T.A. Delchar, Cambridge Solid State Science Series, Cambridge University Press, 1988, pp xi+453, ISBN 0-521-35719-5. Price: U.S.$ 24.95 pbk. EMERGING SYNTHESES IN SCIENCE, A Proceedings Volume in the Santa Fe Institute Studies in the Sciences of Complexity, by David Pines, ed., Addison-Wesley Publishers, 1988, pp x+237. ISBN 0-201-15686-5, Q101.E49. NEW DIRECTIONS IN DYNAMICAL SYSTEMS, London Mathematical Society Lecture Notes Series 127, by T. BedBedford and J. Swift, ed., Cambridge University Press, 1988, pp xiii+283. ISBN 0-521-34880-3; QA614. 8.N49. Price: U.S.$ 34.50. FUNCTIONAL INTEGRALS AND COLLECTIVE EXCITATIONS, Cambridge Monographs on Mathematical Physics, by V.N. Popov, Cambridge University Press, 1987, pp viii+216. ISBN 0-521-30777-5, QC20.7.F85. Price: U.S.$ 49.50. INFINITE IN ALL DIRECTIONS, by F.J. Dyson, Gifford Lectures at Aberdeen, Scotland, Harper & Row, 1988. (Publ. simultaneously by Fitzhenry & Whiteside Ltd., Toronto), pp viii+321. ISBN 0-06-039081-6, Q175.3.D97 Price: Can$ 28.50. NUMERICAL RECIPES EXAMPLE BOOK (C), by William T. Vetterling, Saul A. Teukolsky, William H. Press, and Brian P. Flannery, Cambridge University Press, 1988, pp ix+239. ISBN 0-521-35746-2, QA76.73.C15N86. Price: U.S.$ 19.95 pbk. NUMERICAL RECIPES IN C, The Art of Scientific Computing, by William H. Press, Brian Flattery, Saul A. Teukolsky and William T. Vetterling, Cambrige University Press, 1988, pp xxii+735. ISBN 0-521-3546-5-X, QA76.73.C15N865. Price: U.S.$ 44.50. THEMATIC ORIGINS OF SCIENTIFIC THOUGHT, Kepler to Einstein, by Gerald Holton, Harvard University Press, Revised edit, 1988, pp vii+497. ISBN 0-674-87747-0, Q125.H722. Price: U.S.$ 25.00; $ 12.95 pbk. 10 Elementary Particles and Fields SUPER FIELD THEORIES, Proceedings of a NATO Advanced Workshop, Nato ASI Series, Series B: Physics, v. 160, by H.C. Lee, V. Elias, G. Kunstatter, R.B. Mann, K.S. Viswanathan, ed., Plenum Press, 1987, pp ix+598. ISBN 0-306-42660-9, QC793.3F5N365. Price: U.S.$ 110. 20 Nuclear Physics DETECTORS FOR PARTICLE RADIATION, by Konrad Kleinknecht, Cambridge University Press, 1987, pp viii + 206.ISBN 0-521-35852-3;QC787.C6. Price: U.S.$ 19.95. A PRIMER IN PARTICLE PHYSICS, by L.K. Okun, V.I. Kisin, transi., Harwood Academic Publishers, 1987, pp xi+114, ISBN3-7186-0405-1, QC793.9.036. Price: U.S.$ 9.00 pbk. NONEQUILIBRIUM SUPERCONDUCTIVITY, Proceedings of the Lebedev Physics Institute, Academy of Sciences of the USSR, Vol. 174, by V.L. Ginzburg, ed., K.S. Hendzel, transi., Nova Science Publishers, 1988, pp viii +289, ISBN 0-941743-09-8; QC1.A4114 v.174. Price: U.S.$ 89.00. NUMERICAL RADIATIVE TRANSFER, by Wolfgang Kalkofen, ed., Cambridge University Press, 1987, pp iv+373. ISBN 0-521-34100-0. Price: U.S.$ 49.50. OPTICS, K.D. Mnller, University Science Books, 1988, pp xii+644, ISBN 0-935702-45-8. Price U.S.$ 48.00. PHASE CONJUGATION OF LASER EMISSION, 50th Anniversary edition. Proceedings of the Lebedev Physics Institute Vol. 172, by N.G.Basov, ed., Kevin S.Hendzel, transi. Nova Science Publishers, 1988, pp vii+240. ISBN 0-941 743-07-1. Price: U.S.$ 76.00. QUANTUM MECHANICS AND STATISTICAL METHODS, Proceedings of the Lebedev Physics Institute, Vol. 173, by M.M. Sushchinskiy, ed., Kevin S. Hendzel, transi., Nova Science Publishers, 1988, pp ix+339. ISBN 0941743-08-X, QC1.A4114 V.173. Price: U.S.$ 93.00. RESEARCH ON LASER THEORY, Proceedings of the Lebedev Physics Institute, Academy of the Sciences of the USSR, v. 171, by A.N. Orayevskiy, ed., Kevin S. Hendzel, transi-. Nova Science Publishers, 1988, pp vii + 288. ISBN 0-941743-06-3, QC1.A4114 v.171. Price: U.S.$ 92.00. THERMODYNAMICS AND ELECTRODYNAMICS OF SUPERCONDUCTORS, (Vol. 174 Supplemental Vol.1), Proceedings of the Lebedev Physics Institute, by V.L. Ginzburg, ed., Kevin S. Hendzel, transi., Nova Science Publishers, 1988, pp viii+294. ISBN 0-941743-18-7, QC612.S8. Price: U.S.$ 96.00. THE THEORY OF TARGET COMPRESSION BY LONGWAVE LASER EMISSION, Proceedings of the Lebedev Physics Institute, Academy of the Sciences of the USSR, v.170, by G.V. Sklizkov, ed.,Kevin S. Hendzel, transi., Nova Science Publishers, 1987, pp iv+167. ISBN 0-941-74305-5, QC1.A4114 v.170. Price: U.S.$ 73.00. Xa Physique au Canada juillet 1988 115 60/70 Condensed Matter LUMINESCENCE CENTERS 07 RARE EARTH IONS IN CRYSTAL PHOSPHORS, Proceedings of the Lebedev Institute, Vol. 175, by M.D. Galanin, ed., Nova Science Publishers, 1988, pp vi+161. ISBN 0-941743-10-1. Price: U.S.$ 71.00. PHYSICS AT SURFACES, by Andrew Zangwill, Cambridge University Press, 1988, pp xiii+454. ISBN 0-521-32147-6, QC173.4.S94Z36. Price: U.S.$ 69.50; 27.95 pbk. 80 Cross-Disciplinary Physics Book Reviews Critiques des livres THE ANALYSIS 07 STARLIGHT. One Hundred and Fifty Years of Astronomical Spectroscopy, by J.B. Hearnshaw, Cambridge University Press, 1986; pp xv+531. ISBN 0-521-25548-1; QC465.H43. Price: US$ 79.50 This book is highly welcome. It is the first compehensive modern book devoted exclusively to the history of astronomical spectroscopy. DYNAMICS OP PROTEINS AND NUCLEIC ACIDS, J. Andrew McCammon and Stephen C. Harvey, Cambridge University Press, 1987, pp xii+234. ISBN 0-521-35654-0; QD431. M4245. Price: U.S.$ 19.95 pbk. In general terms the book traces the history of the analysis of starlight by astronomical spectroscopy from Fraunhofer's discoveries (1814) to mid-nineteen sixties. MEGA6AUSS TECHNOLOGY AND PULSED POWER APPLICATIONS, by C.M. Fowler, R.S. Caird, and D.J. Erickson, ed., Plenum Press, 1987, pp xvi+879. ISBN 0-306-42 574-2, QC754.2.M3157. Price: U.S.$ 115.00. There are 11 chapters devoted to topics ranging from basic spectroscopic techniques and apparatus to quantitative analysis and special topics of current interest. OXYGEN TRANSPORT TO TIS8UE X, Advances in Experimental Medicine and Biology, vol. 222, by M. Mochizuki, C.R. Honig, T.Koyama, T.K. Goldstick and D.F. Bruley, ed., Plenum Press, 1988, pp xviii+766. ISBN 0-30642795-8, QP177.I56. Price: U.S.$ 125.00. The historical developments have been presented in an impartial manner. Each chapter has a large number of references. In addi-tion to describing the development of certain topics, the scientists of the time are personalized with quotes from their original works and letters and by their photographs. I noticed one error: the picture on p 319, identified as that of Carlyle S. Beals is actually that of R.M. Petrie. A reference to "Sources of illustrations" indicated that this photograph was from J. Roy. Astron. Soc. Can., 60, 157, 1966. On looking up this reference, I found it to be an obituary of R.M. Petrie written by C.S. Beals. POWER ELECTRONICS AND MOTOR CONTROL, by W. Shepherd, and L.N. Hulley, Cambridge University Press, 1987, pp X V i i + 4 7 3 . ISBN 0-521-32155-7, TK7881.15. S54. Price: U.S.$ 89.50; $ 29.95 pbk. 90 Geophysics, Astronomy and Astrophysics CAULDRONS IN THE COSMOS, Nuclear Astrophysics, Nuclear Astrophysics Series, by Claus E. Rolfs and William S. Rodney, The University of Chicago Press, 1988, pp xviii+561. ISBN 0-226-72457-3, QB464.R65. Price: U.S.$ 34.95 pbk. THE EXPANDING UNIVERSE, by Sir Arthur Eddington, Cambridge Science Classic, Cambridge University Press, 1987, pp xxiv+127. ISBN 0-521-34976-1, QB991.E944E33. Price: U.S.$ 12.95 pbk. IN DARKNESS BORM, The Story of Star Formation, by Martin Cohen, Cambridge University Press, 1988, pp. x+196. ISBN 0-521-26270-4, 523.8 QB806. Price: U.S.$ 19.95. THE INTERNAL CONSTITUTION 07 THE STARS, by A.S. Eddington, Cambridge University Press, 1988, pp xiv + 407. ISBN 0-521-33708-9, QB875.E33. Price: U.S.$ 19.95 pbk. OCEANIC REMOTE SENSING, Proceedings of the Institute of General Physics, Academy of the Sciences of the USSR, v.l, by F.V. Bunkin and K.I. Volyak, ed., Kevin V. Hendzel, transi., Nova Science Publishers, 1987, pp V+222. ISBN 0-941743-12-8; GC10.4.R4D57313. Price: U.S.$ 62.00. It is an excellent book. It covers all the important topics, that I could think of, except one. The difficulties in making the correct identification of spectral lines are not sufficiently brought out. For instance, there is no mention of how iron was identified in the solar spectrum. The difficulties in the identification of the D3 line and nebulium lines are mentioned only briefly. Coronium seems to have been left out completely. This book clearly represents a labour of love and I enjoyed reading it. It deserves to be widely read by all those who are interested in stellar spectra and by astrophysicists in general. Y.P. Varshni Department of Physics University of Ottawa AN ATLAS 07 7UNCTI0NS, by Jerome Spanier and Keith B. Oldham, Hemisphere Publishing Co.,(distributed by Springer-Verlag outside of North America), 1987, pp ix+700. ISBN 0-98116-573-8. Price: US$ 149.50. SCATTERING 7R0M BLACK HOLES, by J.A.H. Futterman, F.A. Handler and R.A. Matzner, Cambridge Monographs on Mathematical Physics, Cambridge University Press, 1988, pp X+192. ISBN 0-521-32986-8, QB843.B55F88. Price: U.S.$ 44.50. This is a compendium of functions which most physicists will be able to use from time to time. There are sixty-four chapters devoted to almost as many distinct function types. Most readers will identify this book with The Handbook of Mathematical Functions by Abramowitz and Stegun published in an inexpensive paperback version by Dover Books. Unlike this standard reference, the book under consideration does not give tables of numerical data pertaining to the function types covered. This absence has been intentional. The easy access most people have to computers now makes books with endless tables of evaluated functions historical curiosities. The authors do, however provide graphs of the various functions which can be read off with two or three significant figure accuracy. They also provide efficient algorithms for calculating the functions on computing devices. SUPERMASSIVE BLACK HOLES, by Minas Kafatos, ed., Cambridge University Press, 1988, pp 382. ISBN 0-521-342 46-5. Price: U.S.$ 54.50. The book includes most useable functions from simple functions such as the constant, linear, and stepfunctions to more complex functions, such as elliptic THE ROLE 07 7INE-SCALE MAGNETIC 7IELDS ON THE STRUCRE 07 THE SOLAR ATMOSPHERE, Proceedings of the Inaugural Workshop and Round Table Discussion for the DE-S Telescope Installations on the Canary Islands, by E.H. Schrnter, M. Vasquez, A.A. Wyller, ed.,Cam-bridge University Press, 1987, pp.xi+379. ISBN 0-521-342813, 523.7 QP528. Price: U.S.$ 59.50. 116 Physics in Canada July 1988 inte-gral functions, Gauss functions, and Hurvitz functions, which are defined in terms of integral transforms. The standard trigonometric, exponential, and polynomial types are all systematically discused. The authors have not restricted themselves to the mathematically proper function definitions. For instance they have included in the function menagerie such creatures as the Dirac Delta "function" along with a discussion of the symbiotic Kronecker Delta. Each chapter has a standard form: it is usually divided into fourteen sections on the various definitions special cases, generalizations, and relations proper to the particular function. Behaviour is discussed and mapped out in red, green, and blue coloured curves. The analysis of each function is quite thorough. The publishers seem to be aiming this book at reference libraries and scientific institutions rather than at individuals. The high quality glossy paper (which helps to give this offsize book a hefty weight just greater than two kilograms) and the multicoloured graphs (of which there are more than 150) explain the cost. At the time of writing it is of the order of $200 dollars Canadian! It is a pity that less expensive version could not be produced without the aristocratic trappings that this book has been given. In the chapter on Kelvin Functions the authors explain that people who have a distaste for aristocracy call these functions Thompson Functions, after Wm. Thompson, who changed his name upon being accepted to the peerage. Presumably such people would also have problems with the style of this book. My reservations about the cost notwithstanding, I would wholeheartedly agree that excellent scholarship has gone into making this reference work and it should be of great use to anyone who needs to know anything about functions. Dwight E. Vincent Physics Department University of Winnipeg CHAOS IN LASER-MATTER INTERACTIONS, by P.W. Milonni, Mei-Li Shih and Jay R. Ackerhalt, World Scientific, 1987; pp xi+369. ISBN 0-971-50-180-5. Price: US$ 28.00 pbk. The contents of this book are much broader than the title would indicate. In fact it contains a thorough introduction to most aspects of dynamical chaos, lead ing up to the specialized sections on laser-matter interactions. The subject to which the name "chaos" has been attached is based on the discovery that systems with deterministic rules of evolution can nevertheless evolve in an apparently random way. As a consequence the formerly ill-defined notion of "randomness" which has long been confused with indeterminism, has begun of acquire a useful meaning. One may distinguish between regular and chaotic behaviour by following two trajectories that are initially very close. In regular motion the separation between the trajectories grows at most as a small power of time. In chaotic motion the trajectories diverge exponentially, and so the future behaviour of an individual trajectory becomes practically unpredictable, even though it is deterministic. Determinism means the existence and uniqueness of the trajectory, given the initial conditions. Predictability requires in addition that the trajectories be insensitive to small errors in the specification of initial conditions. Quite simple systems with only a few degrees of freedom may exhibit both regular and chaotic motions in different regions of their phase space. The book is divided into two parts: Part 1 on distonian systems (23 sections). Some of the general topics covered in the first part are: period doubling, and other route to chaos; Lyapunov exponents (which characterize the rate of exponential divergence of nearby trajectories); Feigenbaum universality; strange attractors; and Kolmogorov entropy The more specialized topics on lasers include multi-mode in- stabilities, bistability. self-pulsing instabilities, and optical The second part proceeds from a review of actionangle variables to the important concept of invariant tori, and to the KAM theorem. The transition from regular to chaotic motion is explained in terms of overlapping resonances and the consequent breakdown if invariant tori. Specific models studied include the Fermi-Pasta-Ulam model, the Henon-Heiles model, the periodically kicked pendulum and the classical model of excitation of molecular vibrations. A section entitled "Is Classical Physics Really Deterministic?" takes its title from a paper of that name by Max Born. Its inclusion is curious, since Born's question and his tentatively negative answer to it were a consequence of his failure to conceptually distinguish determinism from predictability. But the earlier sections of this book provide the basis for an unambiguously affirmative answer. Quantum chaos is treated in six sections. The problems in this recent area of research include the definition of its subject matter. Classical chaos is defined in terms of the behaviour of trajectories, but since quantum mechanics does not deal with individual trajectories it is not immediately clear what 'quantum chaos' refers to. The authors define the subject as the study of those quantum mechanical characteristics that distinguish systems whose classical behaviour is chaotic from those whose classical behaviour is regular. They examine energy level distributions and power spectra of time-dependent probability amplitudes. No definitive general conclusions have yet been reached, but many interesting results have been obtained. For example the Jaynes-Cummings model of a two-level atom interacting with its radiation field may exhibit chaos in certain limits, but if the rotating wave approximation is used, the results will always be regular. I hope that the sales of this book will not be limited by the unfortunate choice of too restrictive a title. In fact it could serve as a textbook for a course on dynamical chaos. Leslie E. Ballentine Department of Physics Simon Fraser University CHAOS, NOISE AND FRACTALS, by E.R. Pike and L.A. Lugiato, ed., Adam Hilger, 1987, pp xiii+249, ISBN 085274-364-5, QA845. Price: U.S.$ 43.00. This volume in the Malvern Phys-ics Series is a collection of invited contributions given at a special seminar on Chaos, Noise and Fractals held at Como, Italy, in September, 1986. The avowed intent is to present an overview of the way in which fractal and chaotic structures behave in the presence of stochastic and quantum noise; taken as a whole, the 'chapters' in the book accomplish this objective reasonably well. There are thirteen articles in the book, ranging from an eight page article on "Fractals in Quantum Mechanics" to a fifty page article on "Fixed Points and Chaotic Dynamics of an Infinite Dimension Map". The type face used varies widely but in each case the result is very readable; as well the number of typographical errors seems remarkably small. The usefulness of the book is also enhanced by the inclusion of a fairly complete index. As one would expect, given the reputation of the editors of the present volume, there is considerable emphasis on quantum optics as a source for the models discussed in many of the contributions. The long article by Moloney, Adachihara, McLaughlin and Newell on "Fixed Points and chaotic Dynamics of an Infinite Fixed Map", for instance, takes as its starting point the non-linear differential equation for laser beam propagation in an optical ring cavity containing a non-linear medium. This article is especially interesting, by the way, for its skillful blend of analytical and numerical techniques. Xa Physique au Canada juillet 1988 117 A sampling of some of the other longer chapters: "Quasi-probability Distributions in Astable Dissipative Quantum Systems", "Limitations of the Rabi Model for Rydberg Transitions", "Ergodic Semiclassical Quan. turn Mechanics", "Chaos in a Driven Quantum Spin System" , "A Review of Progress in the Kicked Rotator Problem", and "Influence of Phase Noise in Chaos and Driven Optical Systems". John Cordes Department of Physics Dalhousie University CHEMICAL BONDS OUTSIDE METAL SURFACES, by Norman H. March, Plenum Press, 1986, pp xii+284. Price: U.S.$ 52.50 This book attempts to provide theoretical descriptions of the states of molecules perturbed by their adsorption on metallic surfaces, as well as of dynamical surface processes involving absorbed molecules and of surface catalysis. An introductory chapter reviews the thermodynamics and chemical kinetics of adsorption, desorption and catalysis. The next two chapters treat the subject of the book's title: the perturbation of chemical bonds in diatomic and polyatomic molecules by adsorption on a metal surface In the approach of the author and his co-workers, the simple valence-bond description of an isolated molecule is modified to include the electrostatic image potential of the metal surface considered as a perfect conductor. The results are applied to questions of chemical interest such as the occurrence of molecular or dissociative chemisorption of diatomic molecules on different metals, and the conformational changes of polyatomic molecules. Such semiempirical methods are gradually being replaced by molecular orbital calculations on clusters, which are based on modern quantum chemistry and take account of the microscopic structure of the metal surface. March considers some cluster calculations briefly but emphasizes their computational difficulties. In the second half of the book the author considers processes involving motion of absorbed molecules. Chapter 4 deals with vibrational modes and the theoretical basis of neutron inelastic scattering from surfaces. Chapter 5 presents various theories of molecular desorption rates, which are important to understanding the rates of chemical reactions catalysed by surfaces. The final chapter considers chemical aspects of catalysis, considering reaction rate theory in general, as well as diverse topics such as orbital symmetry control of a surface reaction and surface reactions with oscillating rates. I found this book rather difficult to read. The presentation of many subjects is sketchy and discontinuous, jumping from one subject to another without apparent connection. Many important details and even definitions are left to the original references. In my opinion clearer introduction to surface chemical physics are available, for example Somorjai's Chemistry in Two Dimensions: Surfaces, or Rhodin and Ertl's Nature of the Surface Chemical Bond. John M. Sichel Département de chimie et biochimie Université de Moncton THE COMPLETE BOOK OF HOLOGRAMS, by Joseph E. Kasper and Steven A. Feller, John Wiley and Sons Inc., 1987, pp viii+216. ISBN 0-471-62941-3; TA 1540.K37. Price: CANS 33.95 he, $ 23.95 pbk. The subject of holography can be taught and studied at many different levels ranging from high school to postgraduate institutions. Accordingly many books have been written on this subject. Most of these are at an advanced level and incorporate considerable mathematics, while others are at elementary level and explain some very basic hands-on information. 118 Physics in Canada July 1988 The Complete Book of Holograms written by Kasper and Feller fulfills the need of a suitable book for high school or freshman level where the subject is treated in sufficient detail to bring out all of its important aspects. This book is especially useful for university freshman, scientists, artists, teachers (onesize-fits-all type). The authors have very successfully accomplished the very tricky and difficult job of explaining a complex scientific topic without mathematical derivations or equations. As pointed out in the foreword, the reader is treated as an uninformed but interested and intelligent friend. Explanations are lucid and full. The first chapter deals with a comparison between a hologram and a photograph. The next few chapters explain very clearly the optics of holography in terms of the geometric model first suggested by Professor Jeong of Lake Forest College, Illinois. Many properties of holograms depend on diffraction phenomena which the geometric model does not exlain. The authors have accordingly made use of the zone plate model to explain these in chapter nine. Chapters 1 to 8 deal with reflection, transmission, single-beam, doublebeam, and the cylindrical holograms. The remaining chapters 10 to 12 explain fancy (hybrid type) holograms like the rainbow type and the computer generated type. Special techniques such as holographic interferometry (holometry), microscopy and holographic movies have also been explained. These chapters enable the reader to gain up-to-date information on the state of the art. Finally, in the last two chapmation (including the price range) for the setting up of a holography lab; it includes experimental techniques, films and film handling, processing etc. Two appendices on laser safety and sources of materials used for holography have been appropriately added at the end of the book. The size of the book (only 200 page) makes it an easy and enoyable reading. It is the most appropriate book to teach holography to a mixed group (scientists, artists, hobbyists etc.) or to a non science audience. Anyone who has some interest in holography should have this book in his collection. Sudha Joshi Department of Physics York University CONSTRAINT'S THEORY AND RELATIVI8TIC DYNAMICS, by G. Longhi and L. Lusanna, ed., World Scientific Publishing Co., 1987; pp xv+351. ISBN 9971-50-182-1. Price: US$ 55.00. This book gives various aspects of relativistic dynamics with a particular emphasis on the Dirac-Bergmann theory of constraints. It represents a compilation of papers presented at a workshop held in Florence, Italy in 1986. The papers presented encompass the fields of general relativity, relativistic mechanics, particle physics, and mathematical physics. There are reviews of standard dynamics and constraint theory as well as many applications. The classical canonical formalism of Lagrangian dynamical systems forms the starting point of many theoretical discussions of gauge fields. Underpining the methodology in this approach is the work of P.A.M. Dirac starting in 1933 and P.G. Bergmann starting in 1949. Dirac considered field theories with finite degrees of freedom and suggested a method for their quantization. He later generalized his analysis to the case of general relativity. Bergmann was concerned with covariant field theories from the start and with his collaborators developed the connection between gauge invariants and the constraints of these theories. The proceedings start with a paper by Bergmann who submitted his article upon the request of the organizers even though he did not attend. This paper discusses in a non-mathematical way the history and phil». osophy behind the canonical formulation of general relativistic theories. It is an excelent article, es- pecially for anyone wishing to learn more about this method of treating general relativity, but not wishing to get into the depths of the mathematics. What follows the Bergmann paper is a series of papers discussing the canonical formalism in slightly different contexts. There is a paper by Kastrup which reformulates the classical field theory in terms of differential forms. There is a paper by Aldaya and Azcaraga using the group manifold approach. Then there are papers on the formalism applied to general relativity (GR). There is a paper by Ashetar and another by Regge who addresses the problem of using the canonical formalism in quantizing GR. Charap gives a discussion of constraint theory and vierbein GR. Higher dimensions are brought in by Teitel-boim and Zanelli. There are several papers on particle dynamics with a special emphasis on the two-body bound-state problem. In this category are papers by Barut on two-fermion states in QED and by Crater and Van Alstine on spinning quarks in mesons. There are papers on strings and other topics in quantum field theory. Taylor gives a discussion of light-cone-gauge quantization of superstrings and the divergences encountered. Bonora et al. analyze chiral anomalies between field theory and strings. After having given the reader a taste of the overall mixture that this book represents, I will not mention the other excellent contributions to these proceedings for the sake of brevity. This book serves as a good pedagogical introduction for theoretical physicists who wish to understand the basis of the dynamical constraint method and who wish to see the extent that it is relevant. It also provides valuable references for anyone who wishes to get to the roots of the canonical formalism and any of its manifold applications. Dwight E. Vincent Department of Physics University of Winnipeg CONVECTION AND CHAOS IN FLUIDS, by J.K. charjee, World Scientific, 1987; pp x+243. ISBN 9971-50-224-0. Price: US$ 39.00. Bhattar- Given the catchy title and the author's aim of "making the complex behaviour of fluids accessible to undergraduates" I had high hopes for this short (but not inexpensive) monograph. I was expecting, perhaps, something like Schuster's "Deterministic Chaos" specialized to fluids or a specialized version of Berge, Pomeau and Vidal's classic "Order within Chaos", Wiey, the translation of the 1984 Hermann (Paris) "L'or. dre dans le chaos". What is provided is a collection of somewhat old-fash ioned analyses, carefully following Chandrasekhar, to take one from the Navier-Stokes equations to the mode equations of the type made so famous by Lorenz, plus a rather awkward attempt at presenting some of the concepts involved in chaos. What was completely lacking was any picture of what the chaotic behaviour actually looked like in the fluid. The purely fluid part is adequate, but dry and mathematical, with no physical insight. The chaos part is rather opaque and eccentric, with excessive detail on somewhat esoteric details and curious omissions (e.g. no discussion of: normal attractors, contraction+expansion+folding = Smale horse-shoe = strange attractor, details of the Henon attractor, conditional periodicity) considering their importance for fluids. Without a significant knowledge of chaos already a student would be quite lost. The experiments are no better served. Curiously enough, after having carefully introduced the Rayleigh number, the Prandtl number (p. 33, 109) and Nusselt number (p.102) are flung at the reader with no explanation at all, although the Prandtl number was defined without being named in Eq. l-17c (as far as I could see, there being no index). Obviously, the book's attractive cover is the best part. The print looks nearly typewritten (this is not a compliment) and the author has chosen to use his "schematic" sketches rather than using copies of the originals, which are far better. Nor have I ever be- fore seen equations actually looking askew on a page: p. 60 (figs. 4-7, 4-10) are the worst; p. 132 (Eq 714a), p. 104 (Eq. 8-54) and p. 176 (Eq. 9-5) are clearly crooked. If you need to know how to get from basic fluid equations via multiple-scale analysis to the few-mode result, this book treats the following cases: RayleighBenard convection, thermohalines (i.e. with salt as well as temperature diffusion) and binary liquids. Roads to chaos, strange attractors, etc., and Rayleigh-Benard-Lorenz behaviour with much much else besides, are far better treated by Bergé, Pomeau and Vidal (ibid) who do not, however, discuss modes for thermohalines or binary liquids. The book, which takes the undergraduate interested in fluids from the Navier-Stokes equation through to fluid chaos, is still to be written. Tudor-Wyatt Johnston INRS Energie Varennes, Que. FROM PARADOX TO REALITY, Our Basic Concepts of the Physical World, by Fritz Rohrlich, Cambridge University Press, 1987, pp x+229. ISBN 0-521-30749-X; QC173.55.R64. Price: US$ 34.50. This is a book with a markedly philosophical flavour, designed to acquaint non-scientific majors and members of the sophisticated general public with the conceptual framework of modern physics. It is fairly limited in scope focussing attention on relativity and quantum mechanics. It is, accordingly, free of analytical mathematics, though it does, wisely, make use of space-time diagrams in the presentation of the special theory of relativity; always a difficult subject to approach intuitively. The treatment of the history and structure of physical ideas is very clear and cogent. For this reviewer, however, the most fascinating parts of the book are to be found in its "philosophical" excursions. Rohrlich has, in recent years, shown a strong interest in philosophical problems of quantum mechanics. He appears to be highly motivated to enter the fray on the side of the"realists" against the "instrumentalists", and to favour the view that the proper approach to understanding quantum theory should be ontological rather than epistemological. He thus aligns himself against the current cult of mystification typical of much of the popular writing on the subject - a cult typified by, for instance, H. Pagels and P. C.W. Davies. Nevertheless, while professing adherence to the realist doctrine, he appears unwilling to break with the idealist imagery. It seems that his realism is more sustained by fiat than by substance. Only in his excellent treatment of the famous "Schroedinger' s Cat" pseudo-paradox does he become trenchant in his analysis, which leans heavily on Bohr's view of quantum measurement. But one wishes that he had given a clear prescription for skirting the excesses of the "probability interpretation" often presented (falsely) as the essence of the "Copenhagen view-point". Ambiguity is also to be found in his account of the transition from quantum mechanics to quantum field theory, which he introduces with the statement "the electron is now described by a quantum field rather than by a probability amplitude ...". Are both descriptions of the same world? Yet the book clearly rejects the common view of working physicists that current "philosophy" in this area is largely irrelevant. Unfortunately, this is only true if one believes that distorting or misleading the general public is not important. I have noted that on the shelves of many bookstores, popular books on science are found in the section on mysticism and the occult. This is a public statement, and one that should not bring comfort to nor invite complacency in the scientific community. Xa Physique au Canada juillet 1988 119 All reservations aside, however, the verdict on Rohrlich's book is a resounding "not guilty". P.R. Wallace Physics Department McGill University GAUGE FIELDS AND STRINGS, by A.M. Polyakov, Harwood Academic Publ-ishers, 1987, pp x+301. ISBN 3-7186-03 92-6;QC793.3.F5P66. Price: US$ 48.00, $ 18.00 pbk. Out of his own scientific diary Polyakov has brought forth a book that yields a remarkable harvest of insight into field theory. In an unconventional yet beautifully clear approach, he leads us through the subtleties of quantum field theory and statistical mech anics, exploring their relationship along the way. We are treated to several delightful new derivations of previously known results on non-Abelian gauge theories, instantons and string theory. Rather than remaining in established territory, we are led to explore many areas of this subject that are not wellunderstood in the hope that the approach ... will stimulate deeper penetration into the subject. This book would be suitable as a textbook for an advanced graduate course in field theory. It should provide a useful tool to anyone carrying out research at the forefront of field theory. Robert Mann Department of Physics University of Toronto A HANDBOOK OF FOURIER THEOREMS, by D.C. Champeney, Cambridge University Press, 1987, pp xi+185. ISBN 0521-26503-7; 0A403.5.C47. Price: US$ 39.50. Most modern Physicists have occasion to use Fourier series and Fourier integrals, particularly since the advent of fast, economical, 'FFT' software for microcomputers. At the same time there is often concern at the lack of 'rigour' which attends haphazard computation. This excellent book enunciates the various theorems which apply in the area, discusses the necessary background theory involved and then gives precise statements of theorems and applicability. The usual undergraduate Riemann integration technique is often inadequate for a rigorous analysis of situations in which discontinuities are present in integrands, thus the author, properly, starts with an elementary account of Lebesgue integration. This is well presented and distinctly more readable than much of the material usually referenced. Next comes a section on background theorems and inequalities. Minkowski, Holder and Young inequalities are followed by the important Fubini and Tonelli theorems and by a discussion of continuity. Two chapters on convergence and summability complete the background material. The remainder of the book consists really of two parts, the first on Fourier integration and transformation and the second on Fourier series. In the integral material there is a good analysis of Wiener's theorems and of correlation, a technique which is fundamental to many modern physical instruments. In the sections on series, close attention is paid to sampling theorems, a topic which is central to many waveform analysis techniques. The book ends with a chapter on generalized Fourier series and with an extensive bibliography. The material will be of great value both as a teaching tool and as a work of reference for the research. The book is very clearly written. A.D. Booth Autonetics Research Sooke, B.C. 120 Physics in Canada July 1988 Associates H.A. KRAMERS, Between Tradition and Revolution, by M. Dresden, Springer-Verlag, 1987, pp xviv + 563. ISBN 0-387-96282-4. Price: US$ 59.95. When Kramers died in 1952 at the age of 57, Bohr wrote his obituary, in which he said, referring to Kramers' theory of the dispersion of light (1924), further developed in collaboration with Heisenberg (1925): "This work actually proved a stepping stone for Heisenberg, who shortly afterwards ... accomplished a rational formulation of quantum mechanics". In fact, one may argue that Kramers' work played a somewhat analogous role in Heisen berg's creation of matrix mechanics as de Broglie's work did in the creation of Schroedinger's wave mechanics. Those physicists who had close contact with Kramers for many years - I am one of them - underwent his inspiring influence, and admired his broad scientific, literary and musical culture, cannot reconcile themselves with the fact that he is gradually becoming, at best, just a name attached to some theorems, equations and mathematical methods in physics. The book under review is an attempt to retard this perhaps inevitable historical process. The author, a professor of physics at SUNY at Stony Brook, had, as a student in Leyden,known Kramers. The sources of the book are, in addition to Kramers' publications, his unpublished correspondence and diaries, and interviews, by the author and by others, with Kramers' colleagues, collaborators, former students, and also members of his family. What is the result of the author's endeavour? "As structured, the book has considerable unity, coherence and logic. It presents a clear, interesting picture of an extraordinary person and an unusual scientist...". This is what the author himself says in the last paragraph of the Preface. I don't quite agree with his characterization of his book. However, the psychological portrait of Kramers, as a scientist and as a man, which emerges from Dresden's voluminous book, seems to me not only "interesting", but also on the whole quite true, apart from some strange distortions here and there. On the other hand, Dresden's survey of Kramers' research activities and their important results is heavily lopsided. The author is fully aware of that serious deficiency of his book. The necessity to shorten the original 1400 printed pages of text led the author to restrict his detailed historical treatment to three topics.The first two are Kramers' work on the theory of dispersion of light (1923-1925) and the ill-fated BohrKramers-Slater theory (1924). Kramers was then in Copenhagen, where he came, in 1916, as a student, from his native Holland to work with Bohr. From 1926 on, he was back in Holland, as a professor of theoretical physics, first in Utrecht and later in Leyden. The third topic is Kramers' attempt to develop a Q.E. D. based on his idea of mass renormalization (19371948). Part 2 of the book deals with the first two topics;Part 3, with the last one. The origins of the B-K-S theory (which was an attempt interpret the radiation phenomena without using the concept of photons, at the price, however, of giving up the principle of conservation of energy on the atomic scale), the ephemeral excitement created by it among the contemporary physicists, whose reactions varied from enthusiasm to disbelief, and the coup de grace given to it by the Bothe-Geiger experiment -all that, and also the traumatic effect which the fiasco of the theory had on Kramers, is described convincing ly by Dresden in great detail. In no less detail does Dresden describe the development of the quantum theory of the dispersion of light from its original form established by Kramers to its final more general form summarized in the Kramers-Heisenberg formula. In this connection he also examines the puzzling question, to what extent was Heisenberg led to the discovery of matrix mechanics by his close collaboration with Kramers, terminated only half a year earlier; or, as Dresden put it, "why didn't Kramers discover quantum mechanics?" In his discussion of the third of the three topics enumerated above the author tries to convince the reader, perhaps successfully, of the importance of Kramers' contribution, still not widely known, to the advent of Q.E.D. in its modern form. The treatment of the three topics is thorough, mostly technical, and contains many useful digressions. Unfortunately it is also irritatingly repetitious. Yet it is a fascinating story. It illustrates very nicely the role of "the struggles, the mistakes, the false leads,... in the development of science". Its value is enhanced by a judicious choice of numerous quotations from the letters not only of Kramers himself, but also from those of Bohr, Pauli, Heisenberg, and other eminent physicists. There is no doubt that in no other topic of research was Kramers as much emotionally involved as in those three. And since the author seems to be particularly interested in Kramers' psychology, his selection of those topics for an exhaustive discussion is understandable. It is, however, a great pity that all other important contributions of Kramers to physics are hardly mentioned in the book or, at most, very briefly. The origin and consequences of Kramers' celebrated general theorem on the energy value degeneracy are not discussed, nor are the concept of charge conjugation introduced by him, his dominant role in the development of the Wentzel-Kramers-Brillouin method, the Kramers-Kronig relations, etc. Even Kramers' work on statistical mechanics, which Dresden characterizes as "of extraordinary depth and significance", is out-lined on only three pages. If the author had controlled his propensity for repetitions and somewhat trimmed his verbosity, at least 100 pages could have been saved for a satisfactory discussion of these topics. A complete list of Kramers' scientific publications, not available in the book, could not replace such a discussion, but would, by their titles be a useful addendum to what the author says in a two page section entitled "The scope of Kramers'activities" about the great variety of Kramers'interests and achievements in physics. In Part 4 the author considers in detail the interplay between Kramers' character, beliefs and private life on the one hand, and, on the other hand, his research work, teaching activities and public life. Here also a recurring theme in this book is taken up again: why Kramers, being more than once on the threshold of major discoveries, did somehow not make the last decisive step? In this connection the author establishes a list of what he calls "near misses", that is, of missed opportunities, in Kramers' scienti fic life and speculates on their causes. I think that most of them are really not "near misses," but the author's speculations are often interesting. However, when he unexpectedly tries to ascribe "near misses" to Kramers' lacking "the compulsion, perhaps the interest to push his ideas to total clarity, total precision or ultimate simplicity" then I disagree. What really mattered to Kramers in his research was to achieve an "approbation intérieure". This is a phrase he found in a letter of Fresnel to Thomas Young, and I heard him quote it more than once But an "approbation intérieure" does not necessarily imply a worldly success. W. Opechowski Department of Physics University of B.C. THE INTERACTING BOSON MODEL, F. Iachello, and A. Arima, Cambridge University Press, 1987, pp x+250. ISBN 0-521-30282-X; QC793.5.B62. Price: US$ 59.50. Just over a decade ago. Franco Iachello and co-workers introduced a new model, the interacting boson model, to describe in a unified way collective properties of nuclei. Its reception in the middle '70's was hostile. Protagonists said it was no more than a reformulation of the collective model developed by Aage Bohr and Ben Mottelson based on the concept of shape variables. In time this hostility died down. To-day the interacting boson model is well established, its group structures a delight for mathematicians its applications a resurgence for nuclear spectroscopy. The basic ideas are simple. Nucléons are grouped in pairs, to be known as bosons and governed by boson commutation relations, in much the same way as Cooper pairs are introduced in the electron gas. There are six boson operators, one representing an s-boson and five d-bosons. Their direct product with each other form the 36 elements of the group U(6). The trick is to identify chains of subgroups that include the group 0(3), the rotation group. There are three such chains; one with the group U(5) produces spectra reminiscent of Bohr and Mottelson's vibrational nucleus another containing SU(3) yields rotational spectra. The authors describe these groups chains in detail, the construction of their basis states and the assign ment of quantum numbers. The Hamiltonian and transition operators are expressed in terms of the Casimir operators of the groups (with coefficients taken as unknown parameters), and analytic expressions given for their matrix elements. Several medium and heavy nuclei have spectra that can be classified as being purely vibrational or purely rotational. Many more, however, fall somewhere in between. This book is rather sketchy when it comes to comparison with data; little is said on the choice of parameters in the construction of Hamiltonian and transition operators, even less on numerical diagonalisation of mixed representations. The authors cover only properties of nuclei with an even number of protons and neutrons. A second volume is promised to cover the properties of odd mass nulei -the so-called interacting boson-fermion model. A third volume will cover the microscopic structure and the justification of the model; the nucleus after all is made up of fermions, not bosons. The book will appeal to mathematicians interested in boson algebras; the mathematical precision of the opening chapters is a delight to read. It will also be a useful reference work for the nuclear spectroscopist interested in comparing the results of experiments with the predictions of the model. Many formulae are given for the different group chains ensuring that this book will be a useful compendium. Ian S. Towner Chalk River Nuclear Chalk River Lab. MASS SPECTROSCOPY, Second Edit., by H.E. Duckworth, R.C. Barber, and V.S.Venkatasubramanian, Cambridge University Press, 1986, pp xxii+337. Price: US $69.50. The first Edition of this book is highly regarded for its content, historical flavour, clarity, and concise ness. While emphasizing basic principles of instrumentation, it reflects the progress of many facets of mass spectroscopy up to the mid-1950's. Advances during the last three decades have been included in the Second Edition. This formidable task resulted in 131 more pages. New material is distributed uniformly, embracing the authors' specialties (ion optics, atomic mass determinations), newer sources and detectors, and additional areas of applications such as solid state physics and space research. Organic mass spectroscopy has emerged in a more comprehensive separate chapter. Specialists will notice omissions. Whereas uses of organic mass spectrometry in medicine and environment al studies are summarized, the many medical uses of stable isotopes (measurements of total body water, energy expenditure, metabolism, ancient diets, etc,) and isotopic tracing of pollutants in the environment are not mentioned. Occasionally, an additional key sentence would better reflect current knowledge. For example, the two ranges of carbon isotope compositions for plants are cited as "revealing the environmental effects of photosynthetic fractionation". In fact, it should be stated that three distinct photo-synthetic schemes for land plants have been recognized for over a decade, thanks in part to carbon isotope data. Xa Physique au Canada juillet 1988 121 A few typographical errors can be found in equations, chemical formulae, and author names (e.g.Clansen for Clausen and Kanaseiwitch for Kanasewich). Occasionally, words are used incorrectly; "transformed ... bactericidal reaction" should read "transformed ... by bacterial action". Whereas one may speak of "parts per thousand" or "per mil", "parts per mil" should not be used. As a formal text, it lacks problems for assignments. However, it is an excellent first book for independent study or the classroom. Although many details of electronic circuitry, vacuum components, etc., were deliberately omitted, one nevertheless finds much practical information. Most chapters can stand alone and need not be read or studied in order. The book can also serve for enjoyable casual reading. The First Edition sold for $6.00 in 1958. Allowing for inflation, the expanded content, and better quality paper, the Second Edition represents comparable if not better value. H. Roy Krouse Department of Physics The University of Calgary MAXIMUM ENTROPY AND BAYESIAN METHODS IN APPLIED STATISTICS, by J.H. Justice, ed., Cambridge University Press, 1986, pp viii+319. ISBN 0-521-32380-0. Price US$ 44.50. Why has a theorem attributed to, but not written by, an obscure 18th century British clergyman become so important to 20th century statistics? This book, which is the proceedings of the Fourth Maximum Entropy Workshop held at the University of Calgary in 1984, goes a long way in explaining the importance of Bayes' theorem and maximum entropy methods. In essence, Bayes' theorem is concerned with the process of learning: how statistical inferences are modified in the light of new information. The importance of Bayes'theorem is that the prior knowledge of a subject is not lost when new knowledge of the subsubject is obtained. Bayes' theorem allows the mathematical reconciliation of new and prior knowledge. The maximum entropy principle is borrowed from statistical mechanics and states that the "most honest" description of our knowledge of a subject is that state that has the highest entropy. This book consists of 17 papers describing the history and current status of maximum entropy and Bayesian techniques. The rationale for the maximum entropy method is elegantly described in terms of the behaviour of monkeys and kangaroos. An application discussed in several papers is that of image reconstruction. Algorithms are described for the enhancement of blurred or fuzzy images using maximum entropy techniques. Image reconstruction using the maximum entropy technique is shown to have many fields of application, including space exploration and geological prospecting. The reader is also shown how the blurred images taken by automatic cameras can be reconstructed to yield the registration numbers of speeding high-way drivers! This is not a book for the neophyte, but it does provide a fairly comprehensive survey of the fields of Bayesian reconciliation and maximum entropy. J.R. Walker Whiteshell Nuclear Research Establishment Pinawa, Manitoba MODELLING UNDER UNCERTAINTY, Proceedings of the First International Conference on Modelling Under Uncertainty. Stokes Page, 1986, by S.B. Jones and D.G.S. Davies, ed., Institute of Physics (Taylor and Francis), 1986, pp xii +329. ISBN 0-85498-171-3; QA401. Price: US$ 66.00. On the flyleaf to this book, the publisher states that the organisers sought to draw together mathema122 Physics in Canada July 1988 tical modellers, statisticians, and decision makers from a wide variety of backgrounds. This is certainly reflected in the contents of the book: the 25 papers and 7 posters are an eclectic collection representing the many challenges of modelling under uncertainty. The applications discussed in this book range from economic modelling, through the design of road junctions, to the consequences of accidents at nuclear facilities. Much of the discussion in this book concerns modelling where probability density functions (PDFs) represent the uncertainty in the input parameters. Often the modelling involves some variant of the Monte Carlo method. Topics include: Bayesian reconciliation, Markov models, fuzzy set theory, and the public perception of risk. Sensitivity analysis is discussed in many of the papers of this book. In addition to the 'conventional' sensitivity of rate of change of consequence Y with respect to the input parameter X, the conference concluded that the rate of change of uncertainty in X is important. Areas identified as needing further research included the description of ignorance in terms of PDFs, and the presentation of results to technical and non-tech nical audiences. As is often the case with confererence proceedings, this book lacks a strong central focus. It does, however, provide a good review of the methods and developing area of physics. J.R. Walker Whiteshell Nuclear Research Establishment Pinawa, Manitoba NONLINEAR OPTICAL PROPERTIES OF ORGANIC MOLECULES AND CRYSTALS, Vol. 1 and 2, by D.S. Chemla and J. Zyss, ed., Academic Press, 1987, pp xiii+982. ISBN-0-12-170611-7;QD941.N66 V.l; ISBN 0-12-170612-5 (v.2). Price: Can$ 115.50. The rapid development of non-linear optics holds promise for important applications in optical information processing, optical communications, integrated optics and so forth. Historically, due to the emergence of nonlinear optics from solid-state physics, where inorganic crystals, semi-conductors, and insulators formed a major part of the materials investigated. Recently, it is recognized that extremely large non-linear responses are required for many applications in miniature integrated optical devices and optical image processing devices. Meanwhile, it is also recognized that some organic and polymeric materials with large delocalized pi-electrons do exhibit extremely large nonlinear response. Indeed, in many cases they are much larger than their inorganic counterparts. Furthermore, the nonlinear effects due to the polarization of the pi-electron cloud, as opposed to displacement of nuclear coordinates found in inorganic materials which are bandwidth limited, can be utilized for very high frequency application. It is very possible that the properties of organic or polymeric materials can be engineered to optimize for the given application. Although the field of nonlinear optics has been the stronghold of the physics and electrical engineering disciplines, if many of the potential applications are to be realized, then material science and chemistry must play an important role in its future devvelopment. In the spirit of such realization, this two volume set comes into being. The editor organized articles in this two volume set by the types of non-linear optical phenomena. Thus, this set has four parts: introduction, quadratic nonlinear optical effects (i.e. three-wave mixing), cubic non-linear optical effects (four-wave mixing), and concluding comments. The first part has only one article which gives an overview of the basic properties of organic matter. The first chapter of Part II deals with the physical aspects of quadratic optical effects in organic molecules and crystals, while the second chapter concentrates on the quantum-chemical aspects. The next chapter demonstrates the benefits of using quantum-chemistry-based models and symmetri- es to determine the molecular engineering. Chapter 4 deals with the technologically critical issues of growth and characterization of high quality bulk organic crystals and wave-guide structures. The next chapter introduces the growth of thin films by the Langmuir-Blodgett technique. Chapter 6 illustrates the strategy of concentrating on a single molecular crystal as the target and trading second harmonic generation efficiency with the transparency in the U. V. The following chapter discusses another type of trade-off between the unpredictable orientation of molecules in crystalline media and the possibility of acting on the property of liquid-crystalline structures. The last chapter of Part II, also the last chapter of Volume 1, shows the dominant electronic contribution to the electro-optic effects in organics. Part III in vol. 2 concentrates on the third-order processes. In the first three chapters, the polydiacetylene family is singled out for its many appealing physical and chemical features. Its basic structural and electronic properties are introduced in Chapter 1. Experimental studies of third-order processes in these compounds are discussed in Chapters 2 and 3. Chapter 4 presents an general discussion of the relation between system dimensionality and optical response. The next chapter presents detailed computations on specific systems and strongly suggests that polymeric structures can also be engineered in the same way as was established for molecular systems and for quadratic effects. Chapter 6 discusses the important aspects of multiphoton spectroscopy used as a tool to disentangle some of the previously inaccessible features of molecular excited states. The concluding chapter in Part IV points out one of the avenues to explore in the near future in the application of modern concepts of chemistry to optics. The appendixes provide a much needed experimental data bank on powder SHG tests and molecular secondorder hyperpolarizability of organics. In such a rapidly evolving field, one can anticipate that an update or extension of this book will be need ed within the next five years or so. Nonetheless, most of the material covered in these two volumes will be the base of those further developments. This set gives a comprehensive review of nonlinear optical properties and effects of organic and polymeric materials. I recommend this set to scientists and engineers who are involved in nonlinear optical materials, integrated optics, optical image processing, and optical communications. Every technical library should also have this set on its shelves for reference. K.K. Lee, Perkin-Elmer Danbury, Conn. THE NONLINEAR OPTICS OF SEMI-SEMICONDUCTOR LASERS, by N.G. Basov, ed., Kevin S. Hendzel, transi.. Nova Science Publishers Inc., 1987, pp v+281. ISBN 0-941 74301-2. Price: US$ 85.00. Over a quarter of a century has passed since the first semiconductor laser was demonstrated. Semiconductor laser devices have made enormous advances and these lasers have found a broad range of practical applications. Their advantage in compact size, efficiency, low operation voltage and power requirement, economically priced, etc., are being utilized in such applications as optical communications by optical fibers, optical disks recording and play-back, spectroscopic diagnostics of gaseous media, atmospheric pollution monitor, laser printers, lasers projection tel evisions, etc. Yet, due to the complexity of the semi conductor laser systems, there are still some physics problems that have not yet been solved. This volume presents a brief survey of the physics, the achievements and the problems of semiconductor lasers, a discussion of the phenomena of semiconductor lasers, a discussion of the phenomena of nonlinear refraction and the influence of carriers on the index of refraction of a semiconductor. A distinct characteristic of semiconductors is their significant optical nonlinearity. The influence of free carriers on the refractive index is substantial when the carrier concentration depends on intensity, either due to photoelectric absorption or stimulated emission. In semiconductor lasers this influence produces a number of phenomena, such as self-focussing, self-phase modulation, non-linearity of optical losses, frequency self-modulation, bistable modes in compound cavities and amplifiers. These physical principles are then used to study self-stabilisation of single-frequency emission conditions. Both theoretical and experimental research are presented. This volume deals with some of the physics issues which are not focussed in the Western literature. Partly due to this, a few of the papers in this volume reference mainly the Russian literature. Meanwhile, some of the Russian references cited in this volume are very interesting, yet are not well known in the Western literature. In summary, this volume is a welcome addition to the literature of semiconductor lasers. Research physicists working in the physics of the non-linear properties of semiconductor lasers will find several papers in this volume quite useful. K.K. Lee, Perkin-Elmer, Danbury Conn. PASCAL-SC: A Computer Language for Scientific Computation, PERSPECTIVES IN COMPUTING, Vol. 17, by Gerd Bohlender, Christian Ullrich, Jurgen Wolff von Gudenberg, and Louise B. Rail, Academic Press, 1987, pp ix +292. ISBN 0-12-111155-5; QA76.73.P216 P37. Price: US$ 50.50. Pascal is a weak language for scientific computation for a number of reasons. The Authors of this attempt to improve it concentrate on two things, first the inadequacy of its arithmetic package which will, for example, give a variety of answers to relatively simple calculations. The authors cite the evaluation of: 9x 4 - y 4 + 2x 2 when x=10864 and y=18817. Three slight ly different procedures give, as the result: 1.59E05, 8.41E05 and 1.00000. The last result is the correct one. The second perceived inadequacy is the absence of vector and matrix operations in standard Pascal. These and other operations such as complex arithmetic are included in the new Pascal-SC. It is stated that compilers are available for Z80, 8088 and 68000 based machines these, and this book, will be of great interest to those who like to use the language. A.D. Booth Autonetics Research Sooke, B.C. Associates THE QUANTUM UNIVERSE, by Tony Hey and Patrick Walters Cambridge University Press, 1987, pp xi+180. ISBN 0521-26774-7; QC174.12.H48. The reality of quantum mechanics in our universe is indisputable. Yet the laymen typically find this subject both obscure and irrelevant. Even for the scientist, the subtle relationship between quantum mechanics and reality is often difficult to understand. "The Quantum Universe" is a book that will be appreciated and enjoyed for a long time to come, by both scientists and laymen alike. In refreshingly non-technical but beautifully accurate language it tells the story of quantum mechanics from its inception to the present. Its successive chapters delicately unravel the knots of incomprehensibility that the subject often seems to present. Making no use of mathematics, the counter-intuitive probabilistic notions that quantum mechanics forces upon us are lucidly expounded in words and pictures. Here at last is a book that clearly demonstrates the relevance of quantum mechanics. Photography, fission and fusion, carbon dating, transistors, computers, stars, lasers, superfluids, super conductors and subatomic particles are enthusiastically paraded by. The human element of the subject weaves the chapters together with each chapter containing photographs and short biographies of the major contributors to the subject. Xa Physique au Canada juillet 1988 123 This book will have an enormous readership, from the curious laymen, the veteran researcher. I recommend it highly. Robert Mann Department of Physics University of Toronto REVIEW OF PROGRESS IN QUANTITATIVE NON DESTRUCTIVE EVALUATION. Vol. 6A and 6B, by Donald 0. Thompson and Dale E. Chimenti, ed., Plenum Press, 1987, pp vii + 1857. ISBN 0-306-41678-6. Price: US$ 245.00. This conference is an annual event usually held in San Diego in August. The proceedings are always huge: for 1986, the two volumes total 1857 pages. In this case, quality goes with quantity and it is a pleasure to support a continuing effort by the editors in a very important area. The scope is vast. The contents cover generic techniques (ultra-sonics, eddy current, thermal, acoustic emission, X ray, CT, NMR etc.) imaging and microscopy sensors, image analysis and AI, reliability, composites, electronic materials and material characterisation. Of these, the advance in the techniques themselves is one of the most important topics. It is interesting to see that thermal wave imaging is now an established technique, ranking after ultrasonics and eddy current as regards the number of contributions. The second main area, as might be expected, is materials characterisation. Advanced composites and the characterisation of weldments and joints were the main considerations here. As the title implies, this series is particularly useful for detecting trends in NDE. As compared to earlier volumes, there is continued emphasis here on thermal imaging and sensors. There is new interest in artificial intelligence which is clearly finding its way into NDE. Basically, AI is seen as a way of improving the quality and efficiency of data collecting and as a tool for interaction with the non-specialist. In conclusion, this is the bible for trends in NDE in the North American context. Unless you were a participant, the proceedings do not belong on your bookshelf, but they are a must for your University or Company library. The search for new advanced materials is never ending and their evaluation becomes critically important in their new and varied applications. NDE is still a sadly neglected area of engineering research and the present collection to keeping this important subject alive. J.D.N. Cheche Département de Physique Université de Sherbrooke SCIENCE AND TECHNOLOGY IN CHINESE CIVILIZATION, by Cheng-Yih Chen, éd., World Scientific, 1987, pp xix +352. ISBN 9971-50-192-9. Price: US$ 64.00. For one who has seen in display, in a Wuhan museum, the 64 magnificent 5th century bronze set-bells and wondered how they might sound, it is a real pleasure to read that they not only sound fine, but also provided concrete evidence that ancient Chinese knew the chromatic scale. They used a set of surprisingly simple yet accurate, formulas to generate it. The study leading to this conclusion is reported in one of the most delightful articles in the book. It is described by the publisher on the dust jacket as "a representative sample of current work in the history of science and technology by Chinese scholars". The set-bells were unearthed in 1978 from the tomb of Marquis Yi of the state of Zeng, in what is now Hubei province. Archeologists have ascertained that the tomb was sealed in the year -433. Editor Chen, a Professor of Physics at the University of California, San Diego, tells us of the 64 bells. Forty-five form a chromatic tonal system, apparently made to the specification of Marquis Yi, in around -450. Now, anyone who knows anything about Chinese music knows that 124 Physics in Canada July 1988 it is based primarily on a pentatonic scale, with the equivalents of C, D, E, G and A called gung, shang, jiao, zhi, and yu. The frequency ratios for G/C, D/G, A/D and E/A are given by the so-called up-down rule, 3/2, 3/4, 3/2 and 3/4. This gives a C major key where the major 2nd (D), and perfect fifth (G), have exactly the same values as in the natural intonation. The major 3rd (E), and 6th (A), are lightly sharp, by a factor of 81/80, in frequency. This is presumably the source of the odd feeling one has when listening to Chinese music. The agreement in the G key is better with only the major 6th being sharp (by the same factor), and the other notes, including the perfect 4th, have the same value as in the Natural scale. What then did the Chinese know about the chromatic scale? Chen tells us that the prescription for constructing it was explicitly given in "Master Lu's Spring-Autumn (Annals)", published in -239. Presumably the method must have been known for some time before that. It is simple, involving only two freguen cy ratios made up of powers of 2 and 3, r^ - 3'/2 = 2187/2048 = 1.06787 and r 2 = 2 8 / 3 5 = 256/243=1.05350. Both of these are approximations to the irrational ratio for the Equally Tempered scale: r = 2 1 ' 1 2 = 1.05946. The value rj^ is used five times for the ratios C#/C, D#/D, F/E, G#/G and A#/A, with r 2 used for the seven remaining ratios, D/C#, and so on. The ratio for the octave is rj x as it sho-uld be. The resulting "Zhou scale", in C, is a sharp approximation to the Equally Tempered scale, with the larger deviation occurring on the minor notes. The approximation is considerably better in G. In comparison, the Natural scale utilizes the additional prime number 5 and the four frequency ratios s x = 27/25 = 1.08, s 2 =16/15 = 1.06667, S 3 = 135/128 - 1/05469 and s 4 = 25/24 = 1.04167 to construct a scale which, in C, is partly flat and partly sharp relative to the Equally Tempered scale. It is interesting to note that, in order of decreasing magnitude the order of the seven ratios are: s^ > r^ > s 2 > r > s 3 > r 2 > s 4 . Remarkably, the Natural scale uses the two poorest approximations three successive times s 4 , Sj, s 4 for the major 6th, minor 7th and major 7th to give the top end of the scale a wildly modulating effect. And what of Marquis Yi's set of bells? Measurements reveal that the fundamental frequency is 410.1 Hz., and that they were constructed recognizably after the Zhou scale. But with the exception of the minor 7th, they were sharp; with some being very sharp. Consider ing that they were made more than 24 centuries ago, and that they must have endured a good deal of heaving and shoving under deep six in the intervening years, that is not all that bad. An article on the comparative study of early Chinese and Greek work on mathematics raised the old question of who first discovered the Pythagorean theorem. Euclid in his "Elements" (c.-300) attributed it to Pythagoras (about -530). Although the earliest Chinese text extant that mentions the theorem could have been written in the -11th century, I am not sufficiently convinced by arguments given in the present volume to doubt Needham's conclusion that most likely "Zhou Bei Xuan Jing" was written not much earlier than -450. In any case, the Zhou proof was not axiomatic and deductive, but rather was algebraic and made use of the "triangle of 3-4-5". However, the Chinese more than caught up with the Europeans by the 5th century, when Zu derived for n the limit 3.1415926 < r < 3.1415927 and the rational approximation 355/113, an achievement unrivaled elsewhere until late 16th century. On the heels of the supernova 1987A and in the midst of the hype for the Sudbury Neutrino Observatory, it is handy to have two, one old and one new, cataloques of supernovae in recorded history. Of course the well known 1054 SN in Taurus (Crab Nebula) is included in the old one - Weisskopf once said it is the real reason why July 4th should be celebrated. Among the oldest Guest Star (SN in ancient Chinese text) in the new catalogue is one sighted in -532, which we are told should be identified with the astronomical curiosity CTB 87. Other articles discuss optics (the Mohist Canon, -450 to -250, gives a drawing of a pinhole camera), seismology, Metallurgy, rocketry, tribology, and much more than can be mentioned here. And no more needs to be said of this highly enjoyable and informative book. K.K.Lee Perkin-Elmer Danbury Conn. SOCIETAL ISSUES, SCIENTIFIC VIEWPOINTS, Margaret A. Strom, ed., American Institute of Physics, 1987, pp 241. ISBN 0-88318-538-5; Q175.5.S64. Price: US$ 41.25, $ 31.25 pbk. Le titre de ce livre est trompeur. Il ne s'agit pas ici de l'opinion de la science sur certains problèmes sociaux: après tout, la science étant le fruit d'esprits humains, et les problèmes sociaux n'étant pas toujours bien définis les opinions scientifiques peuvent diverger. Ce n'est pas non plus un ensemble d'opinions personelles sur certains problèmes sociaux donnés. Non: c'est en fait une collection d'opinions, provenant de dizaines de scientifiques et d'ingénieurs (dont 12 prix Nobel), sur des sujets fort variés touchant tous, de près ou de loin, â des enjeux sociaux ou culturels. On peut reprocher un certain manque d'unité à ce livre par ailleurs fort intéressant. L'éditeure a tout simplement invité quelques douzaines de chercheurs à lui soumettre des articles courts portant sur des enjeux sociaux et culturels de leur choix. Ce sont les articles de ceux qui qui ont relevé le défi qui forment ce livre de l'AIP. Puisque les auteurs ont choisi eux-mêmes les sujets, sans consultation entre eux, le livre manque peut-être d'harmonie et certainement de débats. Mais pas d'intérêt... La plupart des articles ont déjà été publiés ailleurs dans le passé, souvent il y a fort longtemps. Mais de les retrouver ensemble n'est pas une mauvaise chose. Il y a un manque certain dans la formation universitaire du côté de la responsabilité sociale de scientifiques, et de la formation scientifique des diplômés des disciplines non-scientifiques. Comme le notent les auteurs, tout ce que font les scientifiques finit par avoir des répercussions sociales, mais ces derniers n'en sont pas toujours conscients. Et ils ne sont pas toujours conscients de leur devoir d'instruire le publique de leur découvertes et de l'état de la science. D'autre part, personne n'est plus à l'abri de la science; il est donc malheureux qu'une grande fraction de la population n'ait aucune connaissance en la matière bien qu'elle aura à prendre des decisions technologiques (pire: elle s'en fiche). C'est un peu pour répondre à ces deux besoins que ces articles on été mis ensemble, et que ces auteurs ont senti le besoin d'écrire ces articles. Dans la partie I, "The Choices, The Politics", on retrouve les articles qui touchent l'éthique et la politique des sciences. Quelques articles àylire: "Is Your Research Moral?", par Arthur Schawlow; "The Conscience of a Physicist", par Robert C. Wilson; "Forty Years After -Thoughts of a Nuclear Witness", par Victor F. Weisskopf; "Prologue from 1945", par Philip Morrison; Scientists in Politics", par Pauling. La partie II contient deux articles de Sakharov sur le désarmement. Dans la partie III, les problèmes de famine et de distribution des richesses, ainsi que la croissance exponentielle de notre société, sont traités. George Wald (Nobel, medecine 1967) lance un appel émouvant dans "The children are Crying ...". La partie IV donne la chance à certains chercheurs d'émettre des opinions un peu différentes. Ainsi la place de la femme en science est le sujets de deux articles. Kenneth G. Wilson compare la révolution informatique à celle d'imprimerie dans "The Computer Revolution: Analogies to the Renaissance". D'un intérêt particulier pour les non-scientifiques, la partie V discute des promesses de l'exploration spatiale. J.A. Van Allen s'y déclare incapable de justifier l'aventure spatiale humaine, alors que J.W. Chamberlain y affirme au contraire l'importance 'géophysique' de chercher de l'intelligence extra-terrestre dans notre galaxie (il reprend les arguments de Drake). La partie VI, peut-être la plus intéressante, regroupe les articles sur la place des scientifiques et des ingénieurs dans la société. Provocant, Simon Ramo demande "Is There Intelligent Life on Earth?" Glenn Seaborg dans "The Positive Power of Science" nous rappelle que nous approchons de l'ère oti la civilisation humaine devra se mettre sur l r état stationnaire de son développement: fini l'ère de l'expansion chaotique. Steven Weinberg signe l'article "Science as a Liberal Art", un sujet qui me tient particulièrement à coeur. Pour les physiciens, ne pas manquer l'article de Bardeen: "Beginnings of Solid State Physics and Engineering". Peut-être l'article qui est le plus proche du titre du livre est celui de Maxime Singer: "Genetics and the Law: A Scientist's View". L'auteur y discute de la double personalité de notre société. D'une part le public est ignorant des faits scientifiques; il est même craintif et agressif envers les scientifiques. Mais ce même public demande de plus en plus de technologie, et il n'est pas prêt à en limiter l'utilisation. Un example: la génétique et les compagnies pharmaceutiques ont mauvaises publicité, mais ceux-la meme qui les critiquent demandent qu'on donne des antibiotiques à outrance à leurs enfants. Singer ne manque pas de rappeler l'affaire Lyzenko pour nous mettre en garde contre les décideurs de notre société qui n'y comprenne rien à la science. Un cours portant le titre de ce livre important devrait être imposé à tous les étudiants universitaires. Rien de moins. Gary W. Slater Xerox Res. Centre of Canada SPEAKABLE AND UNSPEAKABLE IN QUANTUM MECHANICS, by J.S. Bell, Cambridge University Press, 1987, pp xii+ 212. ISBN 0-521-33495-0; QC173.97.B45. Price: US$ 44.50. The most commonly mentioned name in quantum mechanics today (not counting those of the founding fathers) is that of John Stewart Bell. Yet it is not the man who is famous, but rather the theorem that bears his name Bell's Theorem is widely quoted, though less widely understood, by physicists philosophers, and others who are interested in science as a part of world-view rather than a source of technology. Many writers (including this reviewer) have commented on the significance and implications of Bell's theorem for quantum mechanics and relativity, and it is interesting to learn what J.S. Bell thinks about the subject. This book is a reprinting of 22 papers that Bell has written on "quantum philosophy" between the years 1964-1986. They have been completely reset in type, which presumably accounts for the high price of the volume. There is considerable overlap among the papers, but even though I had previously read about half of them, I achieved a clearer under standing of his ideas by reading them all together. Moreover, Bell is a very good writer, with a clear and witty style. The first paper in the collection is his 1966 'Rev. Mod. Phys.' article on "hidden variables in quantum mechanics", in which he permanently buried Von Neumann's "proof" that QM was incompatible with more detailed descriptions than that provided by a wavefunction. Then comes his most famous paper in the journal Physics, in which he first exposed a contradiction between local causality and QM. The theorem has the form of a non-constructive existence proof. By postulating the absence of non-local causality he derived a now famous inequality restricting the degree of correlation between the results of measurements on separated objects. Quantum mechanics predicts some correlations to be stronger than is allowXa Physique au Canada juillet 1988 125 ed by locality. In a later paper from which the title of the book is taken, he identifies the "real problem with quantum theory" as being "an apparent incompatibility at the deepest level, between the two fundamental levels, between the two fundamental pillars of contemporary theory", these being Relativity and Quan turn Mechanics. The conflict is not fully resolved by the demonstration that the non-local influences can not be used to send messages at superluminal speeds. Throughout several of the essays Bell comments on the broader conceptual problems of QM, including in parti cular, the "measurement" problem. He remarks,"I think it is not right to tell the public that a central role for conscious mind is integrated into modern atomic physics. Or that'information' is the real stuff of physical theory. It seems to me irresponsible to suggest that technical features of contemporary theory were anticipated by saints of ancient religions." In the essay "Six Possible Worlds of Quantum Mechanics" , he describes three interpretations of QM that he regards as serious and "professional". Related to each of them is an exaggerated "romantic" world view that makes for easy quotations in the popular press, but which does not deserve the attention it receives. The first "professional view is the pragmatic one that uses "good taste and discretion" to decide which parts of the measuring apparatus and environment can be left out of the "quantum system" or treated classically, notwithstanding the fundamental ambiguity involved in any such division.The associated "romantic" view is Bohr's philosophy of "complementarity", which seems to revel in contradictions rather than in their resolution. (Ex: Bohr's statement that the opposite of a deep truth is not a falsehood but another deep truth.) The second "professional" approach is to seek nonlinear generalisations of Schrtfdinger's equation that would, for example, automatically resolve Schrôdinger's cat into either a live or a dead state. The associated "romantic" view is the notion that conscious ness plays a unique role in such processes, a view for which there is no evidence whatsoever. The third "professional" view is based on the "pilot wave" or "quantum potential" of de Broglie and Bohm. This is Bell's favourite of the six because it explicitly illustrates some of Bohr's better ideas, such as his view that the result of a measurement is not necessarily a pre-existing property of the object, but rather it emerges jointly from the object and apparatus, which must be considered as a whole. It also exposes a possible source of the non-local influence that is predicted but not described by Bell's theorem. The related "romantic" view is the Many Worlds Interpretation, with its splitting of worlds and observers to correspond to the unbound number of terms that may occur in a state vector. Bell's arguments for more professionalism in fundamental physics are gentle but well deserved rebukes of certain trends towards speculative enthusiasm. Leslie E. Ballentine Department of Physics Simon Fraser University STRUCTURE AND BONDING IN NON-CRYSTALLINE SOLIDS, Proceedings of the International Symposium, Reston, Virginia, May 1983, by George E. Walrafen and Akos G.Revesz, ed., Plenum Press, 1986, pp ix+449.ISBN 0-30642396-0; QD461.164. Price: US$ 75.00. Amorphous substances which may be solids, glasses or gels are characterized by the lack of long range order (periodicity). In this regard they resemble liquids more than solids. X-ray and neutron studies reveal no diffraction patterns characteristic of translational symmetry only the simple ring pattern of the amorphous material which may be employed to measure the radial distribution function. Amorphous Si0 2 , which is often carelessly called fused or vitreous quartz, is one of the more well-studied examples of this class of materials, but other examples abound from glassy metals, to organic plastic crystals and 126 Physics in Canada July 1988 even glassy water. This book is primarily concerned with studies of Si0 2 and represents a collection of papers presented at the symposium on "Structure and Bonding in Noncrystalline Solids", held in Reston, Virginia in 1983. The book suffers from a lack of focus. It is a collection of twenty different reports of amorphous materials studied by a variety of techniques. Studies of amorphous Si0 2 include molecular dynamics simulations of silica surfaces, semi-empirical MO studies of intrinsic defects, electronic properties, and neutron bombarded and gamma irradiated Si0 2 . There are readable chapters on magic-angle NMR of silicate glass, vibrational studies of phosphate glasses and large angle x-ray scattering of inorganic amorphous compounds. Much of the work has been published elsewhere and few researchers will need to purchase this book. Murray Brooker Chemistry Department Memorial University Nfld. THE SYSTEMATIC EXPERIMENT, by J.C. Gibbings ed., Cambridge University Press, 1986, pp ix+352. ISBN 0-52130982-4; Q182.3.S97. Price: US$ 54.50; US$ 19.95 pbk. The average student of science and engineering spends a considerable amount of time in laboratories trying to develop the skills required to plan and carry out an experimental investigation, to analyze the significance of the results and to inform others of the work. This book is intended to be a guide for the development of such skills, particularly amongst engineers and industrial scientists. The authors have given considerable importance to the planning of experiments which is an activity that undergraduates often tend to neglect. Many observational and measurement techniques are discussed and the book includes a long chapter on photography. However, many techniques of interest to physicists are not mentioned (e.g. vacuum, low temperatures) and the chapter on photography does not mention cinematographic or video techniques. Compared to the rest of the book, the discussion of experimental errors is rather terse and not much guidance is given on the estimation of uncertainties in measurement. General statistical methods of error analysis are discussed in an appendix but here again some important points are missed, perhaps in an effort to keep the book short. For example, the appendix gives the formulae for determining the coefficients in linear regression analysis but does not give the expressions for calculating the standard deviations on these coefficients. The authors have shown how errors may be propagated by means of the wellknown calculus formula for a small increment of a function of many variables but it has not been made clear to the reader that, in order to get the most pessimistic value of the uncertainty in the final result, it is necessary that each term make a positive contribution. The use of computers in error analysis has not been discussed although there is a useful chapter on interfacing experimental equipment to computers. Senior undergraduate and postgraduate students of physics can profit from the excellent advice given about planning experiments and writing reports; the chapters on experimental techniques and the use of computers and photography in experiments will also be useful to many of them. The wealth of detail provided in many of the chapters is probably too much for junior undergraduates and they will need more help in understanding experimental errors than is provided in this book. B.K. Mukherjee Department of Physics R.M.C., Kingston THINKING LIKE A PHYSICIST: Physics Problems for Under graduates, by N. Thompson, ed., Adam Hilger Publishing Company, 1987, pp ix+ 145. ISBN 0-85274-513-3; QC32. Price: US$ 14.00 pbk. This exciting little book contains 137 physics problems that have appeared on a "General Paper" during the final weeks of the honours degree program at the University of Bristol, sometime during the past twenty five years. The problems do not come directly from any particular undergraduate course but do require the application of physics principles to usually quite realistic situations. Some of the problems have specific numerical or algebraic solutions, but many are open-ended and require the making of simplifying assumptions, mathematical approximations or back-of-the-envelope type of solution solutions. The listing of the 137 problems takes up 36 pages of the text; the outline of typical solutions takes up 102 pages. This has been one of the most enjoyable books that I've reviewed in many years. It is impossible to read a book of problems and solutions and then write about it One has to roll up one's sleeves and actually do some of them. The problems that I chose to do involved the following situations. 2. Calculate the temperature rise of a collapsible, spherical dust cloud. 3. What might be the eventual world record for a pole vault. 5. Two soap bubbles coalesce to form a third. Find an expression for the surface tension in terms of the atmospheric pressure and the soap bubble radii. 6. The fact that human beings live for a certain number of years puts a lower limit on the halflife of the proton (about 1 0 1 8 years!). 13. As the air pressure inside a bell jar is reduced the sound of a ringing bell becomes fainter. Show that this is not due to the fact that sound does not travel through a vacuum! (Oops, I've goofed a number of times with this one over the years). 20. Explain how water flows down the Mississippi given that the source of the river is about 5 km closer to the centre of the earth than its mouth. 29. A small magnet of mass m and magnetic moment p can be made to hover above a superconductor. Calculate the equilibrium height. 35. Huxley stated that "six monkeys", typing away unintelligently for millions of years will eventually write, say, all of Shakespeare's plays". Show that this is nonsense. 42. What is the minimum kinetic energy an electron must have if, by colliding with a stationary electron, it produces an electron-positron pair? 48. Calculate the speed at which a hole in a punctured soap bubble increases in size. I hope to work through many more of the problems, occasionally peeking at the solutions, because I am relearning a lot of basic physics, basic knowledge which needs to be primed from time to time in order to remain current and applicable. I am tempted to suggest that we should offer a course entitled 'Think ing Like a Physicist' in which students would encounter many realistic problems similar to the ones in this booklet. Obviously, I found the problems fascinating; the solutions are very well presented. They provide sufficient detail to allow one to arrive at a reasonable solution and clearly state the assumptions and approximations the author deems reasonable. As one colleague stated "Every physicist should do one of these problems every night before going to bed". Wytze Brouwer Department of Physics University of Alberta THREE HUNDRED YEARS OF GRAVITATION, by S.W. Hawking and W. Israel, ed., Cambridge University Press, 1987, pp xiii+684. ISBN 0-521-34312-7; QC178.T47. Price: US$ 69.50. This volume is to commemorate the 300th anniversary of the publication of Isaac Newton's philosophiae Naturalis Mathematica. The editors have assembled a series of review papers where Newton's immense contri bution to physical sciences is assessed and its relevance to current physical research made plainly clear The reviews lead the reader to the major developments and future prospects in gravitation theory, galaxy formation, inflationary and quantum cosmology, and superstring unification. These reviews are self-contained, yet in some sense supplement and update the articles in General Relativity: an Einstein Century Survey, Cambridge Univ. Press, 1979. In the intervening years between these two volumes, major progress has been made in gravitational physics both theoretical and experimental. For instance: The measured orbital speed-up of the binary pulsar which confirmed Einstein's formula for the loss of energy by gravitational radiation the impetus of the binary pulsar to the two-body problem in gravitational theory; the potential and prospects of detecting gravitational waves using laser interferometry; and the superstring theory which offers the hope of including the gravitational force in a unified theory of physics. Equally interesting are some of the historical development and prospectives provided by some of the articles. It is very tempting to write a detailed review of the book with brief reviews of each article, thus to share the joy of reading each one of the articles. Barring of that, I would consider this volume not only to be an essential reference for relativists and astrophysicists, but also a source book for the student of the history of physics. Furthermore, part of this book should be also very appealing to any physicist who is interested in the historical development or future prospects of the discipline. The whole book is not for everyone, but I am sure that anyone who browses through this text will find some interesting parts and will learn something from its readings. I recommend this book wholeheartedly to every curious physicist. This volume should be on his bookshelf! K.K. Lee Perkin-Elmer Danbury Conn. VECTOR AND VECTOR OPERATIONS, by P.G. Dawber, Student Monographs in Physics, Adam Hilger, 1987, pp. vii+56. ISBN 0-85274-585-0; Q C 2 0 . 7 . V 4 . Price: US$ 8.00 pbk. In the words of the author, this text aims to give an introduction to the use of vectors and vector operators to first year University Physics students who have had little or no introduction to vectors at school. This laudable lofty aim is achieved in part although, to this reader, the concepts and operations of divergence, line, surface and volume integrals is far beyond any reasonable expectation for the first year Physics student, especially those who have NOT been introduced to vectors. Further, most first year students have not been exposed to three dimensional geometry and algebra, hence the expected readers would be in dire difficulties with those concepts and ideas, let alone the superposition of vectors to this domain. The author treats the basic binary operations of addition, multiplication and differentiation of vectors in two dimensions in the first three short chapters. In the final three chapters, he proceeds to the examination of the algebra and geometry of the gradient and curl of a vector to include Line, Surface and Volume Integrals. Each chapter ends with a few examples of direct application of vectors to problems in Physics. The entire textual material is limited to rectangular Cartesian coordinates except for the short section on the application of vectors to circular motion and rotation of rigid bodies, wherein (plane) polar coordinates are introduced. One might well consider Vector and Vector Operators as an abbreviated version of Div, Grad Curl ana All That of H.M. Schey. The succint Dawber text does suffer somewhat in that it does not have problems or clarifying exercises in any of the chapters for intended readers. Nevertheless this text might well be useful to one who already has studied vectors and who would like a short readable review of vectors as applied to some problems in Physics. G.R. Hébert Department of Physics York University Xa Physique au Canada juillet 1988 127 WAVEFORMS: A HISTORY OF EARLY OSCILLOGRAPHY, by V.J. Phillips, Adam Hilger, (Taylor & Francis), 1987, pp xii+259. ISBN 0-85274-274-6; TK381. Price: US$ 77.00. In a sense this book is a continuation of Darwin's Shop' reviewed previously. It is a of the development of the oscillograph, the bifilar instrument, manufactured by Cambridge ments, being a prime example. 'Horace history Duddell instru- The ingenuity of the early physicists and electrical engineers who had to deal with the emerging technology of alternating current power supply is well brought out in the pages and illustrations of the book. It transpires that, although the relevant dynamics were well known to applied mathematicians a century earlier, it was not until 1853 that Lord Kelvin showed how the classical differential equation indicated the correct design principles for such things as critical damping. A.C. machines were not alone in requiring an effective method for viewing waveforms, sonics, phonograph recording and electrocardiography all contributed. All of the ingenious devices so produced are illustrated and explained in the book which should be read by all young physicists. A.D. Booth Autonetics Research Sooke, B.C. Associates THE WISDOM OF SCIENCE, Its Relevance to Culture and Religion by Hanbury Brown, Cambridge University Press 1986, pp viii+194. ISBN 0-521-30726-0; Q175.B7946. Price US$ 32.50; $13.95 pbk. The author suggests that, while we live in a culture that is dependent upon science for its very existence, this society is largely ignorant of the ideas and perspectives on which science is based. Not only are our political leaders, lawyers, civil servants, and editors of newspapers ignorant of science but Brown suggests that "if the average graduate in Arts were to be transported back in time and asked by an inquisitive Ancient Greek to explain why the sky is blue why water is wet or glass is transparent, I doubt if he or she would have much to tell..." in fact, Aristotle might be surprised to what extent many of his ideas still survived among twentieth century intellectuals. One obvious reason for this situation is that the general public learns too little science, but, the author suggests, the science that is taught to the general public is too narrow in its scope, and oriented primarily towards the production of future engineers and professional scientists. The main task of the book is, therefore, to tell a bit more about the cultural aspects of science and the way science might enrich our modern society. In the first two sections of the book, Brown, in a very readable and informal style, takes a look at the historical development of science. These chapters abound with interesting anecdotes and are spiced with many pictures and drawings of historical inventions and scientific discoveries. Besides referring to the major scientific and technological discoveries of the past. Brown also relates the development of science to the relevant literature of the times, using poetry plays (Shakespeare and Shadwell), and Utopian literature to provide science with a context. These sections were interesting to read, although I found the analysis of certain conceptual revolutions, for example, the Copernican, somewhat superficial. In section 3, the Cultural Dimension of Science, Brown discusses in more detail the place modern sci- 128 Physics in Canada July 1988 ence, basic and applied, should occupy in modern socety. The author recognizes the changing images of science over the years - from 'irrelevant 300 years ago, to "beneficial" 100 years ago, to "questionable" today. Brown suggests that one remedy for this problem of image might be to provide a scientific education which better reflects the integration of science and culture, and perhaps a better way to control scientific research and its application. Brown suggests more public involvement, and less reliance on experts in setting the overall priorities of scientific research. The expert should be considered by the public as a colleague, not as an oracle. "A good example of what I mean is the debate which took place in Cambridge (Mass.)... when the proposal to construct a laboratory at Harvard for genetic experiments with DNA was brought to the attention of the City Council..." Brown suggest that such deliberations are essential if scientific research is to become considered as an essential cultural activity. Nevertheless, Brown does suggest that, in setting priorities for basic research and in funding basic research, scientists, not politicians, should make these choices. At the end of section 3 and in section 4, Brown discusses the relationship between science and values and science and religion. He suggests that the practice of science, contrary to oft-expressed opinions, does embody a well-defined set of values that has important implications for society. In non-academic terms, these values are intellectual honesty, internationalness, being skeptical and self-critical, and the promotion of the public nature of scientific know ledge. It is not quite clear in the manuscript whether Brown deplores the current emphasis on military and industrial secrecy. It hardly seems fair, however, to hold the scientific values of internationalism and the public nature of knowledge up to society to emulate, while condoning the nationalisation and commercialisation of science and its resulting secrecy. In section 4, Brown discusses the relationship between science and religion and suggests that a reconciliation between the two is overdue. The subsequent discussion appears to imply that such a reconciliation can be achieved if and only if, current world religions reject their ties to the cosmogonies of the past any apply a few of the insights gained from modern science to the religious domain. These insights include support for the unity and interpendence of all life, open-ness to change and development, the recognition that scientific theories (metaphors) are as fallible as religious metaphors, etc. One of the lessons to be learned from modern science is not what it has accomplished, but the way it goes about achieving what it does, and its openness to change and development or they will pass into oblivion and their place will be taken by other, perhaps more adaptable faiths. The first two sections of the book were very readable and laced with interesting anecdotes and illustrations. The last two sections were more thought-provoking and worth rereading. While not agreeing with everything the author said in these sections, the discussion raised many questions in my mind that require further thinking. A well-written book for an evening's reading or as a general reference for my science or science education students. Wytze Brouwer Department of Physics University of Alberta DEPARTMENT OF PHYSICS UNIVERSITY OF WATERLOO NSERC UNIVERSITY RESEARCH FELLOWSHIPS The Department of Physics at the University of Waterloo expects to make several tenure track appointments in the next few years in both experimental and theoretical physics. In anticipation of these openings the Department invites applications from well qualified candidates for nomination to NSERC University Research Fellowships. Prospective candidates should have one or more years post-doctoral experience and an excellent research record in Condensed Matter Physics, Theoretical Physics, Optics or Biophysics. These fellowships are faculty positions at the Assistant Professor level funded by NSERC and the University. Successful candidates will be expected to pursue a vigorous research programme and carry a reduced teaching load. Applications including a complete curriculum vitae and a summary of past and future research interests should be sent by August 15, 1988 to: Professor I.R. Dagg Chairman Department of Physics University of Waterloo Waterloo, Ontario Canada N2L 3G1 The University of Waterloo is an equal opportunity employer and has a policy of affirmative action with respect to the employment of women. In accordance with NSERC regulations, this advertisement is directed to Canadian citizens and permanent residents. MEDICAL PHYSICIST CONCORDIA CROSS CANCER INSTITUTE UNIVERSITY An immediate opening exists for an experienced radiation oncology medical physicist to join the Medical Physics Department of the Cross Cancer Institute. NSERC University Research Fellowship in Physics The Department offers its physics services to the various clinical departments of the Institute. A machine shop, electronics shop, mould room and treatment planning capabilities are administered by the Department. Two physics technicians are available to perform various technical tasks. Responsibilities of this position will initially be in treatment machine commissioning, calibration and acceptance, but the candidate will eventually be expected to participate with the other five physicists in the support of clinical services and research programs pertaining to Diagnostic Imaging, Nuclear Medicine, M.R.I., Lasers and Radiation Oncology, including Brachytherapy. Teaching of residents and technologists will be included in these duties. Requirements for the position are a Ph.D. degree in physics with five to seven years of clinical radiation physics experience. A computer background would be desirable, but not necessary. The Cross Cancer Institute is a smoke-free workplace. Please submit resume to: L. Buska Cross Cancer Institute 11560 University Avenue Edmonton, Alberta T6G 1Z2 T h e D e p a r t m e n t of Physics, C O N C O R D I A UNIVERSITY, is s e e k i n g a c a n d i d a t e f o r an NSERC U n i v e r s i t y Research F e l l o w s h i p . P r e f e r e n c e w i l l b e g i v e n t o r e s e a r c h exp e r i e n c e in areas r e l a t e d t o M o s s b a u e r s p e c t r o s c o p y , g a l v a n o m a g n e t i c effects, m a g n e t i c s u s c e p t i b i l i t y , T h e o r e t i c a l S o l i d State Physics o r S u p e r s y m m e t r i c G a u g e Field T h e o r y . C a n d i d a t e s m u s t h o l d a d o c t o r a l d e g r e e a n d m u s t have h a d r e l e v a n t e x p e r i e n c e , f o l l o w i n g r e c e i p t of t h e d e g r e e , t o t h e e x t e n t usually r e q u i r e d b y t h e U n i v e r s i t y f o r a p p o i n t m e n t at t h e r a n k o f Assistant Professor. U n d e r NSERC r e g u l a t i o n s , c a n d i d a t e s m u s t b e C a n a d i a n c i t i z e n s o r p e r m a n e n t r e s i d e n t s of C a n a d a . T h e f e l l o w s h i p is f o r t h r e e years a n d r e n e w a b l e f o r an a d d i t i o n a l t w o years. T h e f e l l o w is e l i g i b l e f o r NSERC r e s e a r c h grants. A p p l i c a t i o n s i n c l u d i n g C.V., list o f p u b l i c a t i o n s and t h r e e letters of r e c o m m e n d a t i o n s h o u l d b e sent as s o o n as p o s s i b l e t o : Prof. C.S. Kalman, Chair Department of Physics C O N C O R D I A UNIVERSITY 1455 de Maisonneuve Blvd. West Montreal, Quebec H 3 G 1 M 8 . The Alberta Cancer Board is an equal opportunity employer, but in accordance with Canadian Immigration requirements, this advertisement is directed to Canadian citizens and permanent residents. McGILL UNIVERSITY INDUSTRIAL RESEARCH FELLOWSHIPS FACULTY POSITION IN ASTROPHYSICS MPB T e c h n o l o g i e s Inc. is seeking candidates t o n o m i n a t e for Natural Science and Engineering C o u n c i l of Canada Industrial Research Fellowships. The D e p a r t m e n t of Physics invites applications for a t e n u r e track p o s i t i o n at t h e rank of assistant professor, w i t h a possibility of u p g r a d i n g t o associate professor in special cases. T h e p o s i t i o n c o u l d be available as early as 1 January 1989. Preference w i l l be given t o candidates in observat i o n a l astrophysics w i t h a creative p o t e n t i a l for g e n e r a t i n g e x c i t i n g research. The D e p a r t m e n t is i n c l i n e d t o w a r d s candidates w i t h some e x p e r i e n c e in e x p e r i m e n t s using space vehicles (balloons, satellites, etc.) or s u b m i l l i m e t e r w a v e l e n g t h measurements. Excellent candidates in o t h e r fields of d e p a r t m e n t a l endeavours w i l l also be c o n s i d e r e d . The successful c a n d i d a t e is e x p e c t e d t o have a strong interest in u n d e r g r a d u a t e t e a c h i n g at all levels. A p p l i c a t i o n s are i n v i t e d u n t i l t h e p o s i t i o n is filled. The Fellowships w i l l n o r m a l l y be t e n a b l e in t h e Laboratories of MPB Technologies Inc. located at Dorval, Q u e b e c or Ottawa, O n t a r i o . A p p l i c a t i o n s , t o g e t h e r w i t h c u r r i c u l u m vitae a n d names of t h r e e referees, s h o u l d be sent to: Professor S.K. Mark, Chairman Department of Physics Ernest Rutherford Physics Building McGill University 3600 University Street Montreal, Quebec, Canada H3A 2T8 In a c c o r d a n c e w i t h Canadian i m m i g r a t i o n regulations, p r i o r i t y w i l l be given t o Canadian citizens a n d p e r m a n e n t residents of Canada. Projects in w h i c h successful candidates may be i n v o l v e d include: • • • • • Electromagnetics and M i l l i m e t e r Waves Lasers a n d Laser A p p l i c a t i o n s Electro-optics and A c o u s t o - o p t i c s Plasma, Fusion and Space Science Expert Systems and C o m p u t e r A p p l i c a t i o n s Salaries and o t h e r benefits are t h e same as for p e r m a n e n t staff of equivalent experience. Interested recent graduates, individuals c u r r e n t l y c o m p l e t i n g p o s t d o c t o r a t e fellowships, or candidates w h o w i l l graduate in t h e near f u t u r e w i t h a b a c k g r o u n d in physics, electrical e n g i n e e r i n g or c o m p u t e r science are i n v i t e d t o w r i t e or call: Dr. M.P. Bachynski MPB Technologies Inc. 1725 North Service Road Trans-Canada Highway Dorval, Quebec CANADA, H9P 1J1 Telephone: (514) 683-1490 Fax: (514)683-1727 UBC The University of British Columbia FACULTY POSITIONS The Physics Department invites applications for tenure-track positions at the Assistant Professor level. It is expected that three positions (theorists and experimentalists) will be filled in the next year, and that more appointments will be made in subsequent years. The prime objective of the Department is to augment its strength in Physics and Engineering Physics research, in the very broad areas of elementary particle physics, new materials and quantum optics, and astrophysics. However, really exceptional candidates in other fields may also apply. Candidates should have a Ph.D. degree, some postdoctoral experience, a good research record and an aptitude for undergraduate and graduate teaching. The appointments are subject to final budgetary approval. The University of British Columbia offers equal opportunity for employment to qualified female and male applicants. In accordance with Canadian immigration requirements, this advertisement is directed to Canadian citizens and permanent residents. The Search Committee expects to begin its review of applications on October 1, 1988. Applicants should submit a curriculum vitae, statement of current research interests and future plans, and arrange to have three letters of reference to be sent directly to Prof. B.G. Turrell, Head, Department of Physics, THE UNIVERSITY OF BRITISH COLUMBIA, 6224 Agriculture Road, Vancouver, B.C., CANADA, V6T 2A6. Solid Earth or Ocean Physics NSERC UNIVERSITY RESEARCH FELLOWSHIP tenable at The University of Victoria Centre for Earth and Ocean Research Victoria, British Columbia The Centre for Earth and Ocean Research (CEOR) at the University of Victoria invites applications from qualified Canadian citizens or permanent residents for an NSERC University Research Fellowship. Candidates should possess a Ph.D. degree, one or two years of post-doctoral experience in an area of solid earth or ocean physics, and a willingness to participate in field research. Preference will be given to applicants with research experience in seismology, marine and continental margin geophysics, underwater acoustics or coastal physical oceanography. A successful applicant would be appointed to the Department of Physics & Astronomy and would be expected to contribute to the graduate programme of CEOR, which encourages research collaboration with scientists at the nearby Institute of Ocean Sciences, the Pacific Geoscience Centre, Royal Roads Military College, and the Defence Research Establishment Pacific. Applicants should have a strong background in general physics and should be capable of teaching the standard courses in an undergraduate physics degree programme, in addition to graduate courses for CEOR. The candidate selected will be nominated by the University for an initial 5 year term as an NSERC University Research Fellow: the final decision on such awards rests with NSERC. University Research Fellows are expected to maintain an active research programme, supervise graduate students and undertake a limited amount of teaching. On the recommendation of the University they are eligble for appointment to a second five year term on a tenure track leading to a permanent university position. The University of Victoria offers equal opportunities to qualified male and female applicants. NSERC regulations require that nominees for University Research Fellowships be Canadian citizens or permanent residents at the time of nomination. Letters of application including a curriculum vitae, publication list, and names and addresses of three referees should be sent as soon as possible, but certainly no later than September 1, 1988, to: Dr. R. W. Stewart Centre for Earth and Ocean Research Elliott Building University of Victoria Victoria, BC V8W 2Y2 Magnetic Resonance Imaging Scientist A position is available for a Research Associate in the Department of Medical Biophysics at the University of Toronto. Applicants should have a Ph.D. with 2 years experience in magnetic resonance imaging and experience in signal and digital image processing. Send résumé and two letters of reference to: R. Mark Henkelman, Ph.D. Department of Medical Biophysics University of Toronto 500 Sherbourne Street Toronto, Canada M4X 1K9 SIMON FRASER UNIVERSITY DEPARTMENT OF PHYSICS BURNABY, BRITISH COLUMBIA V5A 1S6 Telephone: (604) 291-4465 RESEARCH ASSOCIATE P O S I T I O N Solid State Chemical Physicist T h e E n e r g y R e s e a r c h I n s t i t u t e at S i m o n Fraser U n i versity w i l l have a Research Associate p o s i t i o n availa b l e b e g i n n i n g i n t h e f a l l o f 1988. C a n d i d a t e s s h o u l d have a Ph.D. in physics plus 2 or 3 years of research. Experience w i t h t h i n films, p o w d e r suspensions, a n d c h e m i c a l a n d e l e c t r i c a l m e a s u r e m e n t s o n s u c h syst e m s is d e s i r a b l e . Salary $ 2 4 , 0 0 0 p.a. A p p l i c a n t s s h o u l d s e n d t h e i r c.v., list o f p u b l i c a t i o n s and arrange for t h r e e letters of reference t o be f o r w a r d e d b y A u g u s t 15, 1 9 8 8 t o : D r . S.R. Morrison, Director Energy Research Institute Simon Fraser University Burnaby, British Columbia Canada, V 5 A 1S6. Preference will be given to candidates eligible for e m p l o y m e n t in C a n a d a at t h e t i m e o f a p p l i c a t i o n . INSTITUT NATIONAL D'OPTIQUE CONCEPTION OPTIQUE (LENS DESIGN) L'Institut national d'optique (INO) a présentement un poste à combler dans le domaine de la CONCEPTION OPTIQUE (LENS DESIGN). TRAVAIL: La personne embauchée aura à mettre sur pied un service de conception de lentilles, de systèmes optiques, d'éléments optiques holographiques (HOE), de systèmes infra-rouges et de composantes optiques à gradient d'indice. FORMATION: Les candidats recherchés doivent être détenteurs d'une maîtrise en optique avec spécialisation en conception optique (lens design) et avoir quelques années d'expérience dans ce domaine. CONDITIONS: Le salaire offert sera en fonction de l'expérience des candidats. Les conditions d'emploi telles les bénéfices marginaux et le plan d'assurance sont comparables à celles des grandes corporations publiques et privées. Les candidats intéressés doivent faire parvenir leur curriculum vitae à : Institut national d'optique Responsable du concours n° 8806 4 369, rue Franquet, C.P. 9970 Sainte-Foy (Québec) Canada G1V 4C5 En accord avec les exigences de l'immigration canadienne, la priorité sera donnée aux citoyens canadiens et aux résidents permanents. Chance d'emploi égale pour tous. 1+1 National Research Council Canada NATIONAL OPTICS INSTITUTE LENS DESIGN The National Optics Institute (NOI) wishes to fill a job in LENS DESIGN. RESPONSIBILITIES: The successful candidate will be responsible for organizing a lens design department, (infrared optical systems, holographic optical elements, graded index optics, etc.) QUALIFICATIONS: The applicants must have a master's degree in optics with specialty in lens design and have a few years of experience in this field. CONDITIONS: The salary offered will depend on the candidate's experience. Employment conditions such as the social benefits and the insurance plan are comparable to those offered by large public and private corporations. Interested applicants must send a curriculum vitae to: National Optics Institute Job Application No. 88064 369, rue Franquet, C.P. 9970 Sainte-Foy, Québec, Canada G1V 4C5 In accordance with the requirements of the Canadian Immigration, priority will be given to Canadian citizens and permanent residents. Equal opportunity for everyone. Conseil national de recherches Canada 1989 Research Associateships for research in science and engineering in the laboratories of the National Research Council of Canada Postes d'attachés de recherche - 1989 pour des recherches en science et en génie, dans les laboratoires du Conseil national de recherches du Canada The National Research Council is Canada's leading federal research organization. NRC's laboratory projects cover most areas of the physical sciences, natural sciences and engineering. Le Conseil national de recherches est le principal organisme de recherche du Canada. Les travaux de laboratoire du CNRC couvrent la plupart des domaines des sciences physiques, des sciences naturelles et de l'ingénierie. Applicants for Research Associateships should have recently acquired a Ph.D. in science or a Master degree in an engineering field or expect to obtain the degree before taking up the Associateship. Associateships are open to nationals of all countries although preference will be given to Canadians. Research Associates will be offered appointments to the staff of the National Research Council on a term basis and will be offered salaries and benefits currently available to members of the c o n t i n u i n g staff. As a guide, the current annual Ph.D. recruiting rate is $33,661 (CAN) (under review). Les candidats aux postes d'attachés de recherche doivent avoir reçu récemment un doctorat es Science (Ph.D.), ou une maîtrise dans un des domaines du génie, ou être sur le point d'obtenir un de ces diplômes avant d'entrer en fonction. Les postes d'attachés de recherches sont accessibles aux ressortissants de tous les pays, même si la préférence est accordée aux citoyens canadiens. The initial appointment will normally be for a two-year term and may be renewed, subject to the Associate's performance and subject to the requirements of the Division. Les attachés de recherche seront nommés au personnel du Conseil national de recherches pour une période déterminée. Ils se verront offrir les mêmes salaires et avantages dont jouissent présentement les membres permanents du personnel. En guise d'exemple, le salaire annuel actuel au niveau du doctorat est de 33 661 $ (CAN) (à l'étude). Applications must be made on special application forms w h i c h may be obtained from the Research Associates Office, National Research Council of Canada, Ottawa, Ontario, Canada, K1A 0R6. La nomination initiale portera, en général, sur une période de deux ans et pourra être renouvelée sujet au rendement de l'attaché de recherche et selon les besoins de la Division. Applications and supporting documents must be received in Ottawa no later than 30 November 1988. O n doit poser sa candidature sur un formulaire spécial q u ' o n peut obtenir du Bureau des attachés de recherche, Conseil national de recherches du Canada, Ottawa, Ontario, Canada, K1A 0R6. Les candidatures et les documents à l'appui doivent parvenir à Ottawa au plus tard le 30 novembre 1988. Canada The high energy physics group of the Université de Montréal presently active in the OPAL collaboration at LEP and in the HELIOS collaboration at the SpS at CERN, invites applications for three different positions: 1) Senior high energy experimental physicist. This position is a tenured appointment for an accomplished physicist. Apart from the teaching and research activities normally required, the ideal candidate should have proven capabilities in leading a major research team within a large collaboration. 2) Experienced physicist in experimental particle physics. This position, funded by TRIUMF, is not dependent upon funding for individual projects and involves the possibility of a stable appointment. The Ideal candidate should have several years of active research experience in high energy physics after his doctorate. Preference will be given to applicants with experience in e + e* collider physics. The successful candidate will join the OPAL collaboration. Meeting All Your CAMAC Needs For Laboratory Automation 3) Postdoctoral fellow in high energy physics. The candidate will join the group Involved in the OPAL project. Preference will be given to physicists with experience in e + e* collider experiments. All candidates should be willing to learn French, since this is the working language in our laboratory. Please send applications and CV's to: Hannes Jeremie Laboratoire de Physique nucléaire Université de Montréal, C.P. 6128 Montréal, Qué. H3C 3J7 Canada TRIUMF MESON RESEARCH FACILITY U n i v e r s i t y of A l b e r l a Simon Fraser University University of Victoria U n i v e r s i t y of B r i t i s h C o l u m b i a C o m p e t i t i o n » 563-058 Research Scientist at TRIUMF Applications are invited for a University Research Scientist position in experimental intermediate energy physics. The successful applicant will have the opportunity to contribute to a research program In hadronic physics at TRIUMF using a fully Instrumented magnetic spectrometer and a large solid angle second-arm spectrometer presently under construction. A proposal to upgrade TRIUMF to a 30 QeV, 100 namp KAON Factory Is now under serious consideration by the Canadian government. Participation In experiments at other major accelerators is also possible. The candidate should have extensive experience in intermediate or high energy physics. The University Research Scientist positions are key research positions at TRUIMF. The minimum level at which this appointment will be made is given as follows: The position is for a scientist exhibiting leadership and achievement In intermediate energy physics at the highest international levels of excellence. Candidates will have a Ph.D. and show outstanding promise or significant postdoctoral experience in related areas of TRIUMF's science disciplines. The judgement on leadership will be based on a record of outstanding publications and on references attesting to the candidate's originality, competence, achievements and independence in research, placing the candidate among the upper few percent of his/ her peers The position carries TRIUMF tenure after a suitable probationary period Salary will be commensurate with experience and be in the range of $35,000 to $40,000 per annum. Candidates should respond by Sept. 15, 1988. Please send a curriculum vitae outlining research experience and Interests, and the names of three referees to: TRIUMF Personnel (Competition « 5 6 3 ) , 4 0 0 4 Wesbrook Mall, Vancouver, B.C., Canada, V8T 2A3. F o r i further information contact Dr. P. «itching — (604) 222-1047 We offer equal employment opportunities to qualified male and female applicants. In accordance with Canadian Immigration requirements, this advertisement is directed to Canadian citizens and permanent residents. 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Contact Us For More Information Represented Exclusively In Canada By ! ® TECHNEL ENGINEERING INC. ~ : I : tl " Jl i 120 Whitmore Road. N" 8. P.O. BOX 15. Woodbridge Ontario Canada. L4L 1A9 Tel. (4161 851-4244 Fax: (416) 851-5743 XJBC ] 1Rfffm The University of British Columbia NSERC UNIVERSITY RESEARCH FELLOWSHIPS The Department of Physics invites applications for NSERC University Research Fellowships for the 1988/89 competition. The Department anticipates making several tenure-track appointments during the next five year period and URF's will be given serious consideration for these positions. Candidates should normally have completed one or more years of post-doctoral experience and have a strong research record. NSERC fellows will spend the majority of their time doing research but normally undertake a limited amount of teaching. The fellowships are for three years, renewable for an additional two years and the fellows are eligible for normal NSERC research grants. Under NSERC regulations candidates must be Canadian citizens or permanent residents of Canada. The University of British Columbia offers equal opportunity for employment to qualified female and male applicants. Candidates should submit a curriculum vitae, publication list, a statement of current research interests and future plans, and arrange for three letters of recommendation to be sent, before August 15th, 1988, directly to Prof. B.G. Turrell, Head, Department of Physics, THE UNIVERSITY OF BRITISH COLUMBIA, 6224 Agriculture Road, Vancouver, B.C., CANADA, V6T 2A6. DEPARTMENT OF PHYSICS Applications are invited for a tenure track appointment at the Assistant Professor rank, effective July 1, 1988. Duties include undergraduate and graduate teaching. The successful applicant will also have research responsibilities at the Saskatchewan Accelerator Laboratory. Candidates should hold a Ph.D. degree and have experience in intermediate energy nuclear physics research using accelerators and large magnetic spectrometers. Applications with curriculum vitae and the names of at least three referees should be sent as soon as possible to: Chairman, Department of Physics, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0. In accordance with Canadian immigration requirements this advertisement is directed to Canadian citizens and permanent residents. The next generation ultrashort pulse system. New CW Nd: YAG pump laser. New solid-state pulse compressor, 5 to 5 psec pulses, 5 . o r 10(y4 nm. New sync-pump dye laser, femtosecond und psec pulses, 550-900nm. We've just increased the performance level of ultrashort pulse laser systems. Every component of our system is new. Our unique solid state pulse compressor is the key to system performance. It compresses IR pulses from 100 psec to 5 psec. 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