Graduate School of Science and Technology Material Science and

Transcription

Message from the Dean
Graduate School of Science and Technology
Tokai University
Dr. Shigeru Yamaguchi
Continuing in the spirit of the school’s founder Dr. Shigeyoshi Matsumae,
Tokai University pursues the ideal of nurturing staff with a strong sense of
purpose and a deep sense of humanity who will shape the future. While
guaranteeing top quality education, the University’s main mission is for our
research professors working in leading-edge and applied fields to not only
maintain high levels of research but also train the upcoming generation of
graduate students through their research activities. Until now, the
University’s various faculties have taken a leading role in research by
building up a large research staff and rich resources, and they have also
carried out numerous government-sponsored research programs.
Based on these achievements, the Graduate School of Science and
Technology will create synergy effects in the wide area research activities to
cultivate young graduate students who have started research career. To date,
there has been a tendency to bring together the strength of many researchers
by selecting people from within Tokai University with excellent research
capability in science and technology. The aim is for those researchers to start
a cycle of cultivation of new graduate student researchers that will
eventually make a major contribution to Japanese science and technology
related research. It goes without saying that this will require individuals
with strong research ability, but another vital element is an international
perspective in their research and the ability to mutually collaborate and
integrate different areas of investigation. Even in the laser field, which is my
own specialty, it is important to mutually cooperate not only on laser
research but also in the research fields of electronics and material science. It
is extremely difficult to lead the field as a global researcher without such
reciprocal collaboration to bring out each person’s ingenuity.
In our aim to be a global center of research and education, we intend to
create a place for open staff cultivation and contribute to the wider society,
for which we trust we can rely on your continuing cooperation and support.
Physics
and
Mathematical Sciences
フォトニクス分析の新たなブレークスルー
Physical and Mathematical Science
Research on a new chemical laser
Hyper-power laser that aims at space debris
Topics：chemical laser, iodine laser, fluid dynamics
Principal investigator: Prof. Masamori Endo
Background and Motivation
Chemical lasers are unique because the energy
released by the chemical reactions directly pumps the
gaseous media to the upper state. Because of this
feature, they are highly scalable. On the other hand,
solid-state lasers are encountered the “thermal
problem” as they are scaled up to 100 kW range.
Chemical oxygen-iodine laser is very promising
high-power chemical laser. However it has a known
drawback. Preparation of the reactant takes time and it
cannot be operated instantly whenever needed.
Originality
AGIL (NCl3)
Many research groups have sought for alternative
chemical reactions that could pump iodine atom, and
we succeeded in the operation of “All Gas-phase
Iodine Laser” (AGIL) for the first time in 2009.
The energy source of AGIL is trichloramine, which
could be easily stored in the liquid phase and could be
instantly evaporated to use as a laser fuel. It has the
potential to overcome the COIL’s drawback and it is
also scalable to megawatts as COIL does.
H2 → H + H
NCl3 + H → NCl2 + HCl　NCl2 + H → NCl(1Δ) + HCl
HI + H → H2 + I
NCl(1Δ) + I → I* + NCl
I* → I + h (1315nm)
Impact and Perspective
The key technology of our success is the
sophisticated computer simulation (fluid dynamics and
chemical reaction systems) technique we have
developed.
Chemical lasers used to be studied as weapons.
However, our goal is the removal of “space debris”,
the orbiting man-made objects that is potentially
hazardous for future space developments. Therefore,
our achievement attracted attention of the space
development organizations such as JAXA.
◆Link：http://teamcoil.sp.u-tokai.ac.jp
Published papers from the group
・ T. Masuda, T. Nakamura and M. Endo, “Characteristics of amine-based
all-gas-phase iodine laser,” Appl. Phys. B 101 (2010), pp. 801-810.
・ T. Masuda, T. Nakamura and M. Endo, “An all-gas-phase amine based iodine
laser using molecular iodine as atomic iodine donor,” Chem. Phys. Lett. 485,
pp. 296-298, 2010.
・ M. Endo, “Theoretical and Experimental Studies of the All Gas-Phase Iodine
Laser (AGIL),” Russian J. Phys. Chem. A 83, pp. 1-5, 2009.
◆Contact e-mai：endo at tokai.ac.jp
※at = ＠
Laser based highly sensitive trace material detection
Breakthrough in photonics based
environmental sensing
Topics：Precision
laser spectroscopy・Nonlinear optics
Principal investigator: Prof. Shigeru Yamaguchi ①
Collaborator: Associate Prof. Kazuyoku Tei ②
Collaborator: PhD candidate Yasuhiro Kamba ③
①
②
③
The monitoring and detection of trace gases at
the level of parts per billion (ppt~ppb) in diverse
fields from urban, industrial, rural, biomedical and
greenhouse-gas emission, to applications involving
environmental monitoring of the work shop has
been increasingly important in recent years. The
development of new compact diode laser based
sensors and their application to detect various trace
gas species is one of the key issues to solve the
problem.
Originality
A technique based on long path absorption
spectroscopy,
such
as
cavity
ring-down
spectroscopy and Raman spectroscopy from
ultraviolet to mid-infrared laser offers high speed,
high precision, minimum interference by other trace
gas species, potentially at low cost. Tunable midinfrared light (3-5 m) utilizing DifferenceFrequency Generation (DFG) is one of the most
reliable methods for high precision laser absorption
spectroscopy.
In our proposed design, readily available laser
pump sources are employed ensuring long life time
operation of more than 10k hours. Only one pump
source has to be exchanged or added to access
different trace gas absorption ranges.
Gas
monitors for industrial pollutant measurements, gas
leak monitor and/or toxic species detection must
have high sensitivity with high reliability and little
maintenance.
H.Ashizawa, S. Ohara, S. Yamaguchi, M. Takahashi, M.Endo, K.Nanri, T.
Fujioka, and F. K. Tittel, Jpn. J. of Appl. Phys. Vol. 42 (2003) pp. 1263-1267
J. Sato, M. Kikukawa, S. Yamaguchi, M. Endo, K. Tei, K. Nanri, and T. Fujioka
Appl. Phys. B Vol. 96 (2009) pp. 741–744
T.Yasuda, H.Nozue, T.Fujishiro, K.Tei, S.Yamaguchi Jpn. J. of Appl. Phys.
Vol.49 (2010) 116
◆Contact e-mai：shigeru at keyaki.cc.u-tokai.ac.jp
※at = ＠
Nature Views Conceptualized by Broadband Dynamics
New analysis of dynamical fractals of multiscale networks of water molecules
in complex and biological systems
Topics： Water Structures・Dynamical Fractals・Broadband Dielectric Spectroscopy
spectroscopy・Nonlinear
Principal investigator: Prof. Shinoptics
Yagihara ①
Water Sructure,
Collaborator:
Dynamical
Prof. Naoki
Fractal,
Shinyashiki
Broadband
②
Dielectric Spectroscopy
Collaborator: Associate Prof. Rio Kita ③
Collaborator: Prof. Minoru Fukuzaki ④
Water Sructure, Dynamical Fractal, Broadband Dielectric Spectroscopy
①
②
③
真がは入りま
※ここに顔写真
す。
がは入ります。
④
Structures and functions of various aqueous and
biological materials should be explained from water
behaviors.
The interactions are hierarchically
extended from local parts of water molecules to
molecular aggregates and furthermore to larger scale
of network structures. We develop methodologies of
observation and analysis on multi-scale space and time
in order to understand molecular mechanism of
aqueous complex and biological systems, and suggest
a new nature and life view.
Originality
Upper Left: MD simulates hydrogen bonding network (dotted lines) of
water. Upper Right: Restricted water molecules on protein surface (Brown)
[ref. 2] Lower: Various water structures in water-protein systems.
We have developed our original broadband
dielectric spectroscopy system (1mHz-50GHz) during
these 30 years. Our system treating broadband
behaviors in 17 decades of time/frequency of varieties
of aqueous complex systems (complex liquids, glass,
liquid crystals, polymers, gels, cement, biological
molecules, cells, tissues, biological body) is rarely
available and makes it possible to characterize and
understand dynamical water structures in materials
and body.
Observation and analysis of broadband dynamics in
aqueous complex and biological systems by
broadband dielectric spectroscopy and complementary
methods require new understandings and treatments of
multi-scale interactions. These systems without any
characteristic space and time scales have not been
treated so far.
However applications from the
fundamental studies are available in extensive areas
such as, medical care, pharmaceuticals, foods, devices,
chemical
products,
civil
engineering,
and
architectonics.
A large benefit obtained there
suggests various effective tools to analyze and
evaluate complex materials including life systems.
◆Link：http:// www.sp.u-tokai.ac.jp/~ylab/
Published papers and reviews from the group
１．N. Miura, S. Yagihara, and S. Mashimo, "Microwave Dielectric Properties of Solid and
Liquid Foods Investigated by TDR", J. Food Sci., 68, 1396-1403 (2003)
２．T. Yokomizo, S. Yagihara, and J. Higo, "Rotational motions of solvent sitedipole field around a protein", Chem. Phys. Lett., 374, 453-458 (2003).
３．S. Yagihara, M. Asano, M. Kosuge, S. Tsubotani, D. Imoto, and N. Shinyashiki,
"Dynamical behavior of unfreezable molecules restricted in a frozen matrix", J.
Non-Cryst. Solids, 351, 2629-2634 (2005).
４．Y. Hayashi, N. Miura, N. Shinyashiki and S. Yagihara, “Free water content and
monitoring of healing processes of skin burns studied by microwave dielectric
spectroscopy in vivo”, Phys. Med. Biol. 50, 599-612 (2005).
５．S. Yagihara, M. Oyama, A. Inoue, M. Asano, S. Sudo, and N. Shinyashiki, “Dielectric
relaxation measurement and analysis of restricted water structure in rice kernels“,
Meas. Sci. Technol. Meas. Sci. Technol. 18, 983-990 (2007).
６．S. K. Kundu, S. Okudaira, M. Kosuge, N. Shinyashiki, and S. Yagihara," Broadband
dielectric spectroscopy of a nematic liquid crystal in benzene", J. Chem. Phys. 129
(16), 164509-1-6 (2008).
７．S. K. Kundu, S. Okudaira, M. Kosuge, N. Shinyashiki, and S. Yagihara, "Phase
Transition and Abnormal Behavior of a Nematic Liquid Crystal in Benzene" J. Phys.
Chem. B, 113 (32), 11109-11114 (2009).2)，65-69 (2009)
◆Contact e-mai：yagihara at keyaki.cc.u-tokai.ac.jp
※at = ＠
Physics and Mathematical Sciences
Quark distributions in hadrons and fragmentation functions
Explore the internal structure of hadrons and nuclei
Topics：Quarks, Hadrons, Nuclei
Principal investigator: Prof. Wolfgang Bentz ①
Collaborator: Prof. Anthony W. Thomas (Univ. of Adelaide) ②
Collaborator: Dr. Ian C. Cloet (Univ. of Washington) ②
①
②
In electron scattering experiments, one
can explore the momenta and spins of
quarks in hadrons and nuclei.
Protons and neutrons, the building blocks of nuclei,
are hadrons and consist of quarks. Recent high
energy accelerator experiments gave precise data on
“quark distribution functions’’, which reflect the
internal quark structure of hadrons and nuclei, and
are exploring “quark fragmentation functions’’,
which reflect the hadron production mechanisms.
The aim of the present investigation is to analyze
those data theoretically, and to predict new data
which will be measured in future experiments.
Probability
(ratio to free nucleon)
Results for distribution functions
Momentum fraction of quark in nucleon
Red line . . . Decrease of quark momentum inside the nucleus
(comparison between theory and experiment)
Originality
Blue line . . . Decrease of quark spin inside the nucleus
(theoretical prediction)
Quark fragmentation in
electron-nucleon scattering.
In the experiment, the
momentum distributions of
produced pions are
measured.
pion
photon
electron
Results for fragmentation functions
Results for fragmentation functions
Probability
The originality of the present investigation is that
we can describe the structure of nucleons in terms of
quarks, and the structure of nuclei in terms of
nucleons in the same framework. Because the
nucleons inside the nucleus interact with each other,
their internal structure is different from the free
nucleon. This “medium effect’’ has been highlighted
in recent accelerator experiments, and we perform
the theoretical analyses of those data and predict
new observables.
Energy
fraction
carried
byby
pion
Energy
fraction
carried
The ultimate goal of our research is to understand the
behavior of quarks in the nuclear medium, in particular
their propagation and interactions. Our research has major
impact on the following two subjects: (i) At the planned
accelerator “Electron-Ion Collider (EIC)’’, the in-medium
quark fragmentation functions will be measured, and we
are able to make theoretical predictions. (ii) We are able to
investigate whether in high density matter, like in the
center of neutron stars, “quark matter’’ can exist as a stable
phase, and whether very compact objects like “quark stars’’
exist in the universe.
◆Link：http://www.sp.u-tokai.ac.jp/~bentz/
Black dashed line :Only 1 pion produced (calculation)
Red Solid line : Many pions are produced (calculation)
Blue dashed line : Experimental data
Research papers from our group:
Reassessment of the NuTeV determination of the weak mixing angle.
W. Bentz, I.C. Cloet, J.T. Londergan, A.W. Thomas,
Physics Letters B 693, p. 462 (2010).
The NJL-jet model for quark fragmentation functions.
T. Ito, W. Bentz, I.C. Cloet, A.W. Thomas, K. Yazaki,
Physical Review D 80, p. 074008 (2009).
◆Contact e-mail：bentz at keyaki.cc.u-tokai.ac.jp
※at = ＠
Fusion burn control in tokamak and Helical reactors
Safer reactor study
Topics：Fusion energy,Tokamak,Helical
Principal investigator:
Osamu Mitarai
D-3He ST tokamak reactor cross sectional view
So far we have studied DT reactors using the
tokamak and helical systems. After 3.11, 2011
Fukushima nuclear accident, we should more actively
study the possibility of much safer fusion reactor.
Based on our previous study on neutron-lean D-3He
fusion reactors using the spherical tokamak, we now
restarted the physics and engineering study on D-3He
fusion reactors.
Major radius：
Divertor
Coil
R=5.6m
Shaping
Coil
Minor radius:
BL
Vertical
Coil
BT
6 m
a=3.4m
ITER
Plasma
12 m
Magnetic field: 4.4T
18 m
Plasma current:
94MA
Originality
1 10
0
0.2
p
1
BETAT
0
4
(d)
2
145keV
Electron
2
0
0
VLOOP
-2
Pf (W)
1
0
0.5
0.4
0.3
0.2
0.1
0
4
t
BETAP (c)
2
< >
fash
PF
PF0
0
2
temperature:
3
0.1

Ion
0
4
FASH (b)
Vloop (V)
50
Ti(0) (keV)
100
Ti(0)
Te(0)
20
BV
-4
2000
temperature：
-2
-4
PSV
PBV
1500
113keV
PNV0
(e)
1000
S
B
150
NE0 (a)
2 1020
BV(T)
n(0) (m -3)
3 1020
P ,P (MW)
A D-3He reactor study is not active yet in the world
fusion community. A few example exists using
sherical tokamak for D-3He fusion. Because this
reactor needs a large plasma current together with
other large plasma parameters.
However, if we ramp up the plasma current using
the vertical field, as proposed by author, it would be
possible. Such experiments have been conducted in
QUEST in Kyushu University as a collaboration
program. This technique might open up the new
possibility to achieve D-3He fusion reactor.
IBS
IP
ICD
PEXT
300
100
80
60
40
20
0
2 1020
(f)
(g)
ND0
NHE3
200
0
1.5 1020
1 1020
5 1019
100
0
200
400
600
Time (s)
800
Heating power:
ICD(MA)
0
100
80
60
40
20
0
400
0
1000
300MW
nD.nHe3(m -3)
Ip (A)
PEXT(MW)
Basic proof of principle results has been published.
But the more detailed, actual physics and engineering
design using the small central solenoid would be
desirable.
It would be shown the feasibility of safer D-3He
fusion reactor. This research leads to the DD fusion
reactor without fuel depletion as a large scale power
generation.
Tritium extraction system from the
plasma to improve the reactor safety would be
examined.
500
[1] O MITARAI，in Nuclear Reactors, Nuclear Fusion and Fusion
Engineering," Nova Science Publishers, Inc. (2009), Edited by A.
Aasen and P. Olsson.
[2] O MITARAI，et al. Plasma and Fusion Research:Volume 6, 1402003
(2011)
◆Contact e-mail：omitarai at ktmail.tokai-u.jp
※at = ＠
Differential Geometry
The Geodesic Theory
The cut locus of Finsler manifolds
Finsler manifolds
Principal investigator: Prof. Minoru Tanaka
In recent years, Finsler geometry has been
focused. Finsler geometry is geometrization
of the variational problem, which is a
differential manifold porposed by Finsler.
Originality
I
plan
developed
to
introduce
in
the
some
geodesic
techniques
theory
in
Riemannian geometry to Finsler geometry. It
is unique that we investigate the structure of
Finsler manifolds by using the geodesic
theory.
I am interested in investigating the structure
of the cut locus in Finsler manifolds which
will help us understand the structure of
Finsler manifolds. It is very worthy of
determining the structure of the cut locus of
Finsler manifolds. This is very difficult even
in the case of Riemannian manifolds.
K.Kondo, M.Tanaka, Total curvature of model surfaces control
topology of open manifolds with radial curvature bounded
below.II, Trans.Amer,Math.Soc.vol.362(2010)pp.6293—6324.
B.Bonnard,J-P. Caillau, R.Sinclair, M.Tanaka, Conjugate and cut
loci of a two-sphere of revolution with application to optimal
control,Ann.Inst.H.Poincare Anal.Non
Lineaire,vol26(2009)pp.1081-1098
◆Contact e-mail：m-tanaka at sm.u-tokai.ac.jp
※at = ＠
Surface knots in 4-dimensinal space
Research of surface knots using charts
Topics：Surface
knot・Chart
Principal investigator: Assoc. Prof. A. Shima
We research about surface knots in the
4-dimensional space. Our purpose is a classification
of these knots. We consider the projection of the
surface into the 3-dimensional space. In general, the
projection has the intersection of surfaces. The
intersection is a graph in the 3-dimensional space.
Moreover we projects the graph into the plane.
Then we have a chart. We research objects in the
4-dimensional space using graphs on the plane.
Originality
We have a very useful table of knots, i.e. a table
of closed string in 3-dimensinal space. There is no
table of surface knots in 4-dimensional space such a
table of the 3-dimensinal case. We would like to
make a table of surfaces in 4-dimensinal space.
There are many charts representing the same
surface. We would like to develop the method when
two charts are same or not.
A graph called a chart has only vertices of degree
1, 4 or 6. We have a surprise result that " a surface
representing a chart with at most one vertex of
degree 4 is the same surface representing a chart
without vertices of degree 6 ". Almost charts need
vertices of degree 4. In the future, we want to make
a table about charts having a small number of
vertices of degree 4 or 6.
※他に画像があれば(テクストボックス内)で挿入可能。
※テキストボックスのケイ線
Teruo Nagase Akiko Shima : Any chart削除可能。
with at most one crossing is a ribbon
chart, Topology and its Applications 157 (2010), pp. 1703–1720
Teruo Nagase and Akiko Shima: On charts with two crossings I: There exist no
NS-tangles in a minimal chart, J. Math. Sci. Univ. Tokyo Vol. 17 (2010),
pp.217–241
◆Contact e-mail：shima at keyaki.cc.u-tokai.ac.jp
※at = ＠
Surface knots in 4-dimensinal space
Research of surface knots using charts
Topics：Surface
knot・Chart
Principal investigator: Assoc. Prof. A. Shima
We research about surface knots in the
4-dimensional space. Our purpose is a classification
of these knots. We consider the projection of the
surface into the 3-dimensional space. In general, the
projection has the intersection of surfaces. The
intersection is a graph in the 3-dimensional space.
Moreover we projects the graph into the plane.
Then we have a chart. We research objects in the
4-dimensional space using graphs on the plane.
Originality
We have a very useful table of knots, i.e. a table
of closed string in 3-dimensinal space. There is no
table of surface knots in 4-dimensional space such a
table of the 3-dimensinal case. We would like to
make a table of surfaces in 4-dimensinal space.
There are many charts representing the same
surface. We would like to develop the method when
two charts are same or not.
A graph called a chart has only vertices of degree
1, 4 or 6. We have a surprise result that " a surface
representing a chart with at most one vertex of
degree 4 is the same surface representing a chart
without vertices of degree 6 ". Almost charts need
vertices of degree 4. In the future, we want to make
a table about charts having a small number of
vertices of degree 4 or 6.
※他に画像があれば(テクストボックス内)で挿入可能。
※テキストボックスのケイ線
Teruo Nagase Akiko Shima : Any chart削除可能。
with at most one crossing is a ribbon
chart, Topology and its Applications 157 (2010), pp. 1703–1720
Teruo Nagase and Akiko Shima: On charts with two crossings I: There exist no
NS-tangles in a minimal chart, J. Math. Sci. Univ. Tokyo Vol. 17 (2010),
pp.217–241
◆Contact e-mail：shima at keyaki.cc.u-tokai.ac.jp
※at = ＠
Ising spin system with competitive interactions
Phase transition and ground state spin structure of Ising spin system
Key Words: Monte-Carlo simulation
Principal investigator: Prof. Takashi Iwashita
※研究風景や写真、研究に関する図等
On the various lattice structures with such
triangular and honeycomb lattices and on the
mixed spin system, the conditions of phase
transition, ground state spin structure and
the magnetic properties are investigated for
the spin system with competitive many
interactions.
Originality
By
making
Simulation,
magnetic
use
the
and
of
the
Monte-Carlo
phase
transition,
the
thermal
properties
are
investigated for the Ising or mixed Ising spin
systems with large spin and anisotropy term.
Especially, the temperature dependence of
spin structure is examined visually.
For the spin system and mixed spin system
with large spin and anisotropy term, the
simulation is very complicated in the case of
co-existence of many interactions more than
three different kind. New magnetic phases
with
interesting
magnetic
and
thermal
properties may be found for these systems.
T.Iwashita, K.Uragami ,Y.Muraoka, T.Kinoshita and T.Idogaki, J.
Physics Vol. 200 (2010)101-104
T.Iwashita, K.Uragami, A.Simizu, A.Nagaki , T.Kasama and T.Idogaki,
J.Magn.Magn. Mater. Vol. 310 (2007) 435-438
◆Contact e-mail： tiwasita at ktmail.tokai-u.jp
※at = ＠
Disappearance of anti-matter in early universe
Leptogenesis by neutrinos
Topics：Neutrino mixing, Dirac/Majorana phase, CP violation
Principal investigator: Prof. Masaki Yasue
Anti-matter always accompanies the same
amount of matter. The plenty of anti-matter
in the early universe should disappear in the
present universe. How it has disappeared is a
great puzzle and the most important
research subject. To resolve the puzzle, it is
promising to use “leptogenesis” induced by
three families of neutrinos as members of
leptons. We aim to theoretically explain
their mysterious properties.
Originality
Neutrinos were believed to be massless
and their masses have been detected in 1998.
The Kobayashi-Maskawa mechanism to kill
anti-matter can then be applied to the lepton
sector. Correlations of phases of complex
neutrino masses play a crucial role to induce
CP violation and are predicted in a modelindependent way to give a new framework to
the leptogenesis. A true neutrino theory will
show our correlations.
Proposed Complex Neutrino Masses
Calculated Cosmic Matter Ratio and Observed
Region (WMAP Bound)
Three families of massive neutrinos are
mixed. Two phases called Dirac or Majorana
phase are activated in the leptogenesis. Since
1-3 mixing angle (13) is not observed and is
consistent with 13=0, Dirac phase becomes
irrelevant. A general framework of a neutrino
theory is proposed to predict 13=0 and its
effect on the leptogenesis is numerically
estimated. A specific model named “bi-pair
mixing” is also proposed.
T. Baba and M. Yasue, Phys. Rev. D Vol.75 (2007) pp055001 1-14; Vol.77
(2008) pp075008 1-20; Prog. Theor. Phys. Vol.123 (2010) pp659-686.
K. Yuda and M. Yasue, Phys. Lett. B Vol 693 (2010) pp571-574.
T. Kitabayashi and M. Yasue, Phys. Lett. B Vol.696 (2011) pp478-481.
Dynamics in Aqueous Systems Studied by Broadband Dielectric Spectroscopy
Interactions and Cooperativity of Water and Various Materials from Liquid to Solid
Topics：Water, Protein, Polymer, Dielectric Relaxation, Glass Transition.
Principal investigator: Prof. Naoki Shinyashiki ①
Collaborator: Prof. Shin Yagihara ②
Collaborator: Associate Prof. Rio Kita ③
①
②
③
真がは入りま
す。
※研究風景や写真、研究に関する図等
Dielectric relaxation processes of water have
been observed by broadband dielectric
spectroscopy (BDS) in frequency and
temperature ranges of 1 Hz50 GHz and
80300K. We found two relaxation processes.
One is related to the glass transition
originated from the cooperative motion of
water and solute molecules. Another is due to
the local motion of water which has the
intrinsic relaxation time of water.
Originality
Our BDS has extremely wide time window
ranging 16.5 figures. It is the only method
which makes us possible to see the molecular
motion of macromolecule and water from
liquid to solid simultaneously. Water is the
most popular liquid on earth, but it shows
various peculiar properties if compared to
other liquids. The mechanisms of them have
been made clear by understanding the
dynamics of water.




The properties of hydrated proteins, aqueous
mixtures, and the mixtures of van der Waals
liquids are similar, we transfer the
theoretical understanding gained in the
study of the simple last systems sequentially
to the two other increasingly more complex
aqueous systems. Our new findings have
been extended to understanding of the
properties of water in foods, bio tissues,
artificial organs, and any other various
materials including water.




N. Shinyashiki, A. Spanoudaki, W. Yamamoto, E. Nambu, K.
Yoneda, A. Kyritsis, P. Pissis, R. Kita, S. Yagihara, "Segmental
Relaxation of Hydrophilic Poly (Vinyl Pyrrolidone) in Chloroform
Studied by Broadband Dielectric Spectroscopy" Macromolecules,
44(7), 2140-2148(2011).
N. Shinyashiki, M. Asano, M. Shimomura, S. Sudo, R. Kita, S.
Yagihara, “Dynamics of polymer and glass transition in partially
crystallized polymer solution studied by dielectric spectroscopy” J.
Biomaterials Science: Polymer Edition, 21, 1937-1946 (2010).
N. Shinyashiki, M. Shinohara, Y. Iwata, T. Goto, M. Oyama, S.
Suzuki, W. Yamamoto, S. Yagihara, T. Inoue, S. Oyaizu, S.
Yamamoto, K. L. Ngai, S. Capaccioli, “The glass transition and
dielectric secondary relaxation of fructose-water mixtures” J. Phys.
Chem. B, 112 (48), 15470-15477 (2008).
N. Shinyashiki, M. Shimomura, T. Ushiyama, T. Miyagawa, S.
Yagihara, “Dynamics of Water in Partially Crystallized
Polymer/Water Mixtures Studied by Dielectric Spectroscopy” J.
Phys. Chem. B, 111(34), 10079-10087(2007).
N. Shinyashiki, S. Sudo, S. Yagihara, A. Spanoudaki, A. Kyritsis,
and P. Pissis, “Relaxation Processes of Water in the Liquid to Glassy
States of Water Mixtures Studied by Broadband Dielectric
Spectroscopy”, J. Phys.: Condens. Matter, 19(20) 205113 (2007).
(12pp)
N. Shinyashiki, D. Imoto, and S. Yagihara, “Broadband Dielectric
Study of Dynamics of Polymer and Solvents in Poly(vinyl
pyrrolidone) / Normal Alcohol Mixtures”, J. Phys. Chem. B, 111(9),
2181-2187(2007).
S. Capaccioli, K. L. Ngai, N. Shinyashiki, “The Johari-Goldstein
-relaxation of water” J. Phys. Chem. B 111(28), 8197-8209(2007).
N. Shinyashiki, R. J. Sengwa, S. Tsubotani, H. Nakamura, S. Sudo,
and S. Yagihara “Broadband dielectric study on dynamics of
poly(vinyl pyrrolidone)- ethylene glycol oligomer blends” J. Phys.
Chem. A, 110(15), 4953-4957(2006).
◆Contact e-mail：naoki-ko at keyaki.cc.u-tokai.ac.jp
※at = ＠
Origin of cosmic rays & cosmic non-thermal radiations
High energy astrophysics probed by very high energy gamma rays
Topics：gamma rays・cosmic rays・high energy astrophysics
Principal investigator: Prof. NISHIJIMA, Kyoshi ①
Collaborator: Lecturer KUSHIDA, Junko ②
The origin of cosmic rays has been one of the
biggest mystery in astrophysics since their
discovery 100 years ago. On the other hand, it
becomes apparent that there occur various high
energy phenomena beyond our imagination in the
universe, and very high energy gamma rays are
considered to be the key to unpuzzle not only the
origin of cosmic rays but also the physical process
which arise in such high energy astronomical
objects.
Originality
We observe very high energy gamma rays from
high energy astronomical objects such as active
galactic nuclei(AGN), using the ground based
imaging atmospheric Cherenkov telescope(IACT)
with the world’s highest sensitivity, and study the
mechanism of non-thermal radiation and particle
acceleration in those objects. On the other hand, we
develop a new photon detector for the focal plane
camera of the future IACT whose sensitivity is one
order of magnitude higher than the present ones.
Cherennkov Telescope Array
Using high sensitivity IACT, it is expected to be
made major breakthrough in the high energy
astrophysics. For example, from the observation of
AGNs, the origin of high energy cosmic rays,
physics of jet and central black hole, and the
evolutionary history of the universe might be
revealed. Furthermore, the impact would be made
on the fundamental physics by such as the detection
of gamma rays from dark matter and the
verification of the Lorentz invariance.
テキストボックスのケイ線削除可能。
CANGAROO-III Search for TeV Gamma Rays from two Clusters of Galaxies,
R. Kiuchi, J. Kushida, K. Nishijima, et al., (CANGAROO Collaboration),
Astrophys. J., 704, 240-246, 2009
CANGAROO-III Observations of the 2006 Outburst of PKS 2155-304,
Y. Sakamoto, K. Nishijima, J. Kushida, et al. (CANGAROO Collaboration),
Astrophys. J., 676, 113-121, 2008
P
h
y
s
i
c
s
a
n
d
M
a
t
h
e
m
a
t
i
c
a
l
S
c
i
e
n
c
e
s
Quantum Field Theoretical Statistical Physics
Eelctrons and Photons
Principal investigator: Tadashi Toyoda
Collaborator:
Hideki Koizumi
Collaborator:
Maho Fujita
We
investigate
electromagnetic
properties
of
electrons in metals and semiconductors using the
methods of canonical quantum field theory,
particularly
the
Ward-Takahashi
finite-temperature
relations
and
the
generalized
canonical
commutation relations.
Originality
The theory of the finite-temperature generalized
Ward-Takahashi relations was developed by Toyoda
in 1987 on the basis of the canonical formulation of
quantum field theory.
We are now working on the physics of graphene,
particularly its electromagnetic properties.
Selected papers from the group:
Modern Physics Letters B, Vol. 24, 1923 (2010).
Phys. Rev. Letters, Vol. 100, 036802 (2008).
Phys. Rev. B, Vol. 76, 033416 (2007).
Phys. Rev. B, Vol. 75, 033306 (2007).
Phys. Rev. B, Vol. 71, 033313 (2005).
Phys. Rev. B, Vol. 71, 205312 (2005).
Phys. Rev. B, Vol. 70, 205117 (2004).
Phys. Rev. B, Vol. 67, 075105 (2003).
◆Contact e-mail： toyoda at keyaki.cc.u-tokai.ac.jp
※at = ＠
Characterizations of polymer under temperature gradient
Measurement of irreversible transport coefficient
Topics：Ludwig-Soret effect, Soft materials, Interactions of molecules
※ここに顔
Principal investigator: Associate Prof. Rio Kita ①
Collaborator: Prof. Naoki Shinyashiki ②
Collaborator: Prof. Shin Yagihara ③
写真が入り
ます。
①
②
We have carried out experiments studying the
effects of the temperature gradient in various
solutions. Here, the determination of the irreversible
transport coefficient is rather difficult compared to
the equilibrium condition, since the system shows a
non-uniform spatial and temporal distribution of the
constituents. The aim of this project is to contribute
to
the
development
of
nonequilibrium
thermodynamics by means of an original technique
and systematic studies of the transport phenomena.
③
顔写真がは入り
ます。
J1    Dc1
 c1 1  c1  DT T
ST  DT / D
Originality
For aqueous solutions of polymers (DNAs, proteins,
polysaccharides, and so on), the magnitude and the
direction of their concentration gradient induced by
a temperature gradient show an abnormal behavior.
The results suggest that irreversible transport
phenomena should be investigated with respect to
the role of hydrogen bonds among segmental
molecules and water molecules. The researches may
lead to a deeper understanding of the functions and
the structure formations of biopolymers.
A temperature gradient induces a mass flux which
establishes a concentration gradient in fluid mixtures.
This behavior is called the Ludwig-Soret effect.
The technique of determinations of the transport
coefficient under the external field may clarify the
role of molecular interactions among water
molecules and biological molecules. It is necessary
to continue the fundamental researches for this
purpose. Moreover, some practical applications are
expected in the fields of foods, cosmetics, materials
science, molecularbiology, and so on by utilizing
the effect of temperature gradient as the external
field.
◆Link：http://www.sp.u-tokai.ac.jp/kita_lab/index.html
Y. Kishikawa, S. Wiegand, and R. Kita, “Temperature Dependence
of Soret Coefficient in Aqueous and Nonaqueous Solutions of
Pullulan”, Biomacromolecules 11, 740-747 (2010).
R. Kita, P. Polyakov, and S. Wiegand, “Ludwig-Soret effect of
poly(N-isopropylacrylamide): Temperature dependence study in
monohydric alcohols”, Macromolecules 40, 1638-1642 (2007).
R. Sugaya, B. A. Wolf, and R. Kita, “Thermal diffusion of dextran in
aqueous solutions in the absence and the presence of urea”,
Biomacromolecules 7, 435-440 (2006).
◆Contact e-mail： rkita at keyaki.cc.u-tokai.ac.jp
※at = ＠
Information Science
and
Technology
Electronic Paper
Realization of readable electronic medium
Topics：Display, Paper, Ergonomics
Principal investigator: Prof. Makoto Omodani
Collaborator: Associate Prof. Shuichi Maeda
Paper
• Readable
• Easy handling
• Less energy
We have the general tendency to prefer reading
on a paper than on an electronic display. Reasons of
this tendency should be clarified systematically if
we really want to realize a really readable electronic
media. We know paper media have unavoidable
week points: bulky and wasteful. These week points
can be easily solved by electronic displays. The
challenge for Electronic Paper (e-Paper) is to solve
the conventional week points of electronic displays:
readability and fatigue.
Display
• Rewritable
• Less space
• Less waste
Electronic Paper
Concept of Electronic Paper
Originality
It has not been clarified how the differences
between paper and electronic media affect to
readability, fatigue, and working efficiency.
Advantageous properties should be adopted to
e-Paper if we want to realize comfortable and
convenient electronic media. We have been carried
out quantitative evaluation of these effects.
E-paper can be a platform
IIcan
canread
read
I can read
everything!
everything!
everything!
Novel
Newspaper
Journal
We expect e-Paper will become the main media
for every kind of readings hopefully in ten years.
We hope our basic studies on readability must
contribute to accelerate the popularization of
e-Paper.
1) J. Imai, M. Omodani; “Reasons why we prefer reading on paper rather than
displays: studies for seeking paper-like readability on electronic paper”, Journal
of Imaging Science and Technology，52(5) ，051002-051002-5 (2008).
pp. 90-94(2007).
2) R. Ishikawa, M Omodani: “Estimation of Rotation Behavior of Balls for a
Twisting Ball Display by Mobility measurement”, Journal of Imaging Science
and Technology vol.50,No.2（2006）
◆Contact e-mai：omodani at keyaki.cc.u-tokai.ac.jp
※at = ＠
Information Science and Technology
Human-interface using media integration technology
Hyper realistic information media
environmental Image
sensingwith Scent, Display, and Human Interface
Topics：Senses,
Principal investigator: Prof. Akira Tomono
Computer has been developed by treating symbol
information expressed in the data structure based on
binary logic. However, a human sensibility has
other functions which are different from the logical
information processing. Therefore, the technology
which efficiently processes the human sensibility is
important. We are challenging a research of a
human interface which achieves a high presence by
integrating sense of smell and sense of touch
information in addition to audiovisual information.
Characteristic evaluation of olfactory display using air-cannon.
Originality
Because an olfactory information directly
influences a person's memory and feelings, large
psychological effects of improving presence and
recollecting memory are greatly expected when a
scent is appropriately added to an image. Our
research groups have developed a display which
can space-and-timely control a scent. Also, we are
interested in researching a sensing Multi-media
display which can simultaneously emit a visual and
a scent.
Development of KANSEI multimedia display.
KANSEI means feelings and emotions in Japanese.
A scent can be presented to near an observer’s
nose by using the same technique of an air cannon
(Fig.1). It is possible to synchronize a visual image
with a scent carried by airflow by creating small
holes in a thin display and placing a blower behind
the display (Fig.2). By doing so, a person can sense
more realistic feelings about the image and feel as if
there is a real object around the display (Fig.3).
This technique can be applied to a sensory
simulation game and digital signage in near future.
◆Link：http://www.u-tokai.ac.jp/graduate/index.html
Psychological evaluation of realistic sensation using
Immersive VR System (HoloStageTM).
Akira Tomono, Koyori Kanda, Syunya Otake, IEEJ Transactions on
Sensors and Micromachines. Vol.128, No.12, pp.478-486 (2008)
Akira Tomono, Syunya Otake, IEEJ Transactions on Electronics, Information
and Systems, Vol. 130 / No. 4 / pp.668-675 (2010)
Akira Tomono, Koyori Kanda, Keisuke Tomono, IEICE TRANSACTIONS on
Information and Systems, Vol.J94-D, No.5, pp.803-813 (2011)
◆Contact e-mai：tomono at keyaki.cc.u-tokai.ac.jp
※at = ＠
Usability inspection
environment
to
design
information
More user friendly human interface
Topics：qualitative and quantitative evaluation, novel user interfaces
Principal investigator: Prof. Kiyoshi Nosu
※ここに顔
写真が入り
The info-communication technology has been
ます。
developed very rapidly. In addition to the
performance of individual elements, designing
based upon usability evaluation is becoming
important to realize safety, comfortable and
convenient info-communication environment.
The
research provides a methodology to realize it.
Eye ball movement measurement system for
information media usability evaluation and
analysis
Originality
Manifold Technique to measure and analyze user
reactions to the information environment from
psychology, cognitive science, biomechanics and
ergonomics is employed to obtain reliable and
effective
design
guidelines.
The
technique
employees qualitative methods [(1) interview by the
Evaluation Grid Method, (2) observation method]
as well as quantitative methods [(1) questionnaire
by the SD method, (2) bio-signal measurement]
The manifold usability measurement combing
qualitative and quantitative methods provides the
design guidelines for the environments utilizing
leading edge technology. It also realizes novel
human interfaces using machine learning (AI) and
image processing on facial expressions, eye-ball
movement and other monitored items.
Time sequential emotional estimation from a user’s face
analysis for a novel human interface
A.Shigeta, T.Koike, K.Hamamamoto, K.Nosu,”Estimation of Users’
Subjective Difficulty of WEB Based English Listening Test,” IEEJ
Transaction on Electronics, Information and Systems, 131, 4,
pp.800-807, 2011
K. Nosu, Y.Yabuzaki, and K. Yamanaka, “Evaluation of baseball
pitching form by ground reaction force measurement and video
analysis,” Journal of Visualization, 12, .4, pp.293-294(2009)
K.Nosu, A.Kanda and T.Koike, "Voice navigation in web-based
learning materials – An investigation using eye tracking", IEICE
Trans. Information and System, .90-D, 1, pp.1772-1778, (2007)
Study on Virtual Reality Assisted Medical Ultrasonic diagnosis
Topics：Virtual Reality, Medical Engineering, Augmented Reality
Principal investigator: Prof. Dr. Kazuhiko Hamamoto
Medical
ultrasonic
applied
and
diagnosis
indispensable.
is
widely
Currently,
elastography has been developed. However, a
distance between display and ultrasonic
probe causes losing orientation of tissues and
elasticity information cannot be displayed by
haptic interface.
Originality
Position sensors are attached to the probe
and micro display located in front of eye. A
3D ultrasonic image is displayed on the
display. It is like “see through body”.
Regarding elastography, not only haptic
rendering algorithm but new haptic devices
have been developed for virtual palpation.
Now, a new virtual see through system is
being developed. The system doesn’t require
any position sensors and AR markers.
The developed haptic system can be used for
not only palpation but immersive virtual
environment.
Because
the
system
battery and actuator can be carried.
with
K.Hamamoto(Tokai Univ.)
Investigation on Virtual Palpation System using Ultrasonic Elasticity Imaging
Proceedings of the 2006 IEEE Engineering in Medicine and Biology 28th Annual
Conference, pp.4873-4876 (2006.9)
S.Kikuchi (Tokai U.), K.Hamamoto (Tokai U.)
HAMA device - Haptic display for Immersive Virtual Environments
Proceedings 2008 International Symposium on Communications and Information
Technologies, pp.453-458,(2008.10)
◆Contact e-mail：hama at keyaki.cc.u-tokai.ac.jp
※at = ＠
Neuroscientific Infomatics
Finding the novel algorithms in the Brain
Keywords: Neuroscience, Experimental Psychology
Digital Signal Processing
Principal investigator: Motoharu Takao, Ph.D.
※ここに顔
写真が入り
ます。
I have pursued the studied on neural
circuit
of
mammalian
retina
as
a
neuroscientist. Retinal circuit is an attractive
biological model to understand the principles
of complicated human brain functions. The
new discoveries in my lab will give the clues
to findings of novel algorithms for efficient
information processing in computers.
※
研究風景や写真、研究に関する図等
Originality
So far, my colleagues and I have found
some redundancy in retinal local circuits.
The
redundant
information
processing
provides
of
visual
robustness
to
mammalian visual system. We are learning
these
biological
computer
vision.
systems
to
Slightly
apply
to
redundant
algorithms will enable visual images or
motions to be processed more efficiently and
robustly.
Our goal is to create the information
processing system which is so excellent as
human brain.
J . Neurosc i . (2007 )27:6261－6267, CyberPsychol . Behav.
(2009) 1 2 : 501-507; Chronobiol . Int . (2009) 2 6 : 1470－1477;
Cel l Tissue Res. (2009) 338: 355-357
◆Link：http://www.ds.u-tokai.ac.jp
◆Contact e-mail:takao at keyaki.cc.u-tokai.ac.jp
※at = ＠
Electrical Engineering
and
Electronics
Electrical Engineering and Electronics
Study of charge trapping dielectric films
for advanced nonvolatile memory devices
Topics：LSI process, Nonvolatile memory, Insulating film
Principal investigator: Prof. Kiyoteru Kobayashi
There has been a growing interest in the
metal–oxide–nitride–oxide–silicon (MONOS) type
memory device, primarily due to the increasing
technological importance of this device in the next
generation nonvolatile memories (NVMs). In the
MONOS type device, electrons and holes are
captured in point defects distributed in the charge
tapping dielectric layer to store information. In order
to achieve excellent memory characteristics in future
NVMs, the origin and nature of the point defects in
the charge tapping dielectric layer are crucial issues.
Originality
Silicon nitride films have received considerable
attention as the primary candidate for the charge
trapping dielectric layer in MONOS-type device.
We have studied the properties of point defects in
silicon nitride films. In recent studies, we have
reported a key finding: the paramagnetic K0 defects
in silicon nitride films act as generation centers of
electron-hole pairs. In addition, we have developed
a novel formation technology of the charge trapping
dielectric layer that has superior memory properties.
Controlling the properties of point defects (trap
level, trap density, and capture cross section) in the
charge trapping dielectric layer is the key to realize
the excellent memory characteristics in future
NVMs.
Our study will contribute to the design of electrical
characteristics in point defects and the formation of
desired point defects in the charge trapping dielectric
layer.
◆リンクページ：http://www.ei.u-tokai.ac.jp/Lab/kkbys/
ESR derivative power absorption spectra obtained before
and after exposing a silicon nitrider film to 4.9 eV UV
illumination at room temperature. The intensity of the ESR
signal substantially increased owing to the generation of the
paramagnetic K0 centers.
Current research interests:
Advanced nonvolatile memory (NVM) technology
Novel charge trap dielectric films for NVMs
Modeling of charge trapping in dielectric thin films
Modeling of dielectric degradation in thin insulating films
for ULSIs
Low temperature growth of thin dielectric films
Published papers from the group:
K. Kobayashi and K. Ishikawa, Jpn. J. Appl. Phys., 50 (2011) 031501.
K. Kobayashi and T. Ide, Jpn. J. Appl. Phys., 49 (2010) 05FE02.
K.. Kobayashi, H. Watanabe, K. Maekawa, K. Kashihara, T.
Yamaguchi, K. Asai, and Y. Hirose, Micron, 41 (2010) 412.
K. Kobayashi and T. Ide, Thin Solid Films, 518 (2010) 3305.
K. Kobayashi, H. Yokoyama, and M. Endoh, Applied Surface Science,
254 (2008) 6222.
◆電子メール：kkbys at keyaki.cc.u-tokai.ac.jp
※at = ＠
Development of light wave microphone
Proposal of novel method hearing sound by light
Topics：Laser measurement, sound, optical information processing
Laser
beam
Principal investigator: Prof. Yoshito Sonoda
Mirror
Collimating
lens
Diode
laser
Beam
splitter
Lens&
Detector
Fig.2 Compact type
信号回折光 signal light
Diffracted
検出器
Photo detector
Sound sauce
音源
Laser
light
レーザ光
A microphone has a history of development over
one hundred years but the principle that a
diaphragm is used as a sound sensor has not been
changed. It has many limits and demerits in
application as well known. The present research
proposes a novel sound detection method with no
diaphragm, which is based on wave-optical
principle and can directly detect sound by a laser
beam.
（光ダイオード）
レーザ光源
Laser
入射光学系
Incident
optical system
Voice
Optical
processing
受光光学系
system
信
号
処
理
部
Signal
processing
音声
Speaker
レーザビームマイクロホン
のイメージ図
Reproduced sound
Fig.1 Image of light wave microphone.
Anechoic Box
Diode Laser
Laser Beam
Originality
Detector
Optical bench
Vibration Isolator
Speaker (sound source)
Fig.3 Experimental setup for fundamental study
First Stage (～1998)
120
Feeling Limit
100
Second Stage (2000)
2×10-2
40 Background noise level in the experimental room
2×10-3
20
2×10-4
Audible Limit
0
10
2
4
6 8
0
10
2×10-5
2×10-6
2
4
6 8
0
0
10
2
4
6 8
0
1
0
00
（
Frequency（Hz）
The basic theory and fundamental technique of
the light wave microphone are nearly established
and music sound of high intensity over 60dB could
be reproduced by a home stereo. One of the present
most important subjects is improvement of SN ratio
for detection of a whispered conversation. If it is
attained, the light wave microphone with no
diaphragm would be effectively used in the wide
fields relating to audio and ultrasonic waves with
long wavelengths.
2×10-1
Conversation
60
20
2
Music
80
200
Sound Pressure Pa
2000
140
（
）
Sound Pressure Level dB
Limit by the 300Hz high-pass filter used in the experiment
160
-20
Input to
home stereo
Vibration Isolator
）
The conventional optical method measuring
high-frequency ultrasonic waves cannot be applied
to detection of audible sounds with long
wave-length. In the light wave microphone
proposed in this study, ultra-weak diffraction light
generated by a phase modulation by sound is
focused as a diffraction pattern by using a Fourier
optical system and it is transformed to an electrical
signal by a photodiode. By these optical processing
with no diaphragm, sound can be measured with
non-contact and no-disturbance.
Optical bench
2
4
00 2
00
10
6 8
Fig.4 Range of sound used in daily life and status of development.
T.Sakoda,Y.Sonoda，Measurement of Low-Frequency Ultrasonic Wave
in Water Using an Acoustic Fiber Sensor, IEEE Trans. Ultrasonics,
Ferroelectrics, and Frequency Control, Vol.53 (2006) pp.761-767.
T.Sakoda, Y.Sonoda, Visualization of sound field with uniform phase
distribution using laser beam microphone coupled with computerized
tomography method, Acoustical Science and Technology, Vol.29 (2008)
pp.295-299.
Y.Nakazono, Y.Sonoda, Y.Ouchi, Y.Nasu, Near-field acoustic
characteristics of screech jet exhausted from a nozzle with a hard
reflecting plate, Journal of Visualization, Vol.11 (2008) pp.153-162.
◆Contact e-mail：shigeru at keyaki.cc.u-tokai.ac.jp
※at = ＠
Electrical and Electronics Engineering
Aproach to EMI measures using lossy
transmission line theory
Topics： Distributed constant transmission line filter
using thin resistive sheet
Investigator: Prof. Tsuyoshi Ideguchi
In these days, the electromagnetic compatibility (
EMC) to reduce the unwanted generation of
electromagnetic energy and to maintain correct
operation of equipment in the presence of
electromagnetic disturbances becomes important.
Principle action for the EMC are quieting the
sources of interference, making the coupling path
between source and victim less efficient and making
the potential victim systems less vulnerable. Here,
transmission line on a printed board circuit becomes a
main source and main victim.
We paid our attention to a lossy transmission line
theory and started a study to apply that characteristic
to an anti-EMI measure.
x  0.5m
x0
(1)Effective power
propagation
50Ω
Line 2
50Ω
Ｅ
Model circuits
for calculation
Line 1
ｘ
δ ｘ
50Ω 50Ω
Resistance 100 times as line 1
Capacitance 10 times as line 1
＋
Plx
(1) Inducing line
Psx
(2) Induced line
0.015
Is 100 j 0.01
0.005
0
Calculated results
of effective power
propagation
0.2
0.4
0.6
xj
(3) Inducing line + Induced line
Psx  Plx
Originality
Network analyser
OUTIN
Bi-log antenna
Thin resistive sheet
Insulator
Ground plane
Conductor line
for EUT
Measurement setup
for emitted EM field
Ground plane
for Chamber
3.8ｍ
1.0m
0
0
200
400
600
800
1000
1200
1400
-20
|S21| +AF (dB)
Following new knowledges were obtained.
(1)Propagation characteristics of effective power
on two transmission liens.
(2)The distributed constant transmission line filter
using thin resistive sheet to reduce a propagating
effective power on the line and to reduce an emission
from the line..
(3)Clarification of balance-Unbalance effective
power conversion characteristics of metallic pair
lines from a low frequency to a high frequency.
(4)Its application to a method for estimating
equivalent ground plane.
(2)Effect of thin
resistive sheet
-40
-60
-80
-100
-120
Conductor line with thin resistive sheet
Measurement results
for emitted EM field
Conductor line only
Frequency （MHｚ）
As lower voltage drive of electronics devices and
speedup of signals will be promoted, an electro
magnetic interference will be increased in future.
When signals more than GHz come to propagate a
print board circuit, transmission lines on the PBC
should be considered as distributed constant circuits.
The knowledge and the measures mentioned above
will become effective for these cases.
◆Link：http:// www2.ktokai-u.ac.jp/~tideguti/
T.Ideguchi, H.Koga and Y.Shimoshio, IEICE Trans.Commun.
Vol.J-82-B, No.1, pp.184-187, January 1999.
T.Ideguchi、H.Koga and Y.Shimoshio, IEICE Trans.Commun.
Vol.E-83-B, No.3, pp.480-488,March 2000.
T.Ideguchi, H.Koga and Y.Shimoshio, IEICE
Trans.Commun.Vol.J84-B, No.7, pp.1386-1390, July 2001.
A.sakai and T.Ideguchi, IEICE Trans. Commun. Vol.J87-B, No.8,
pp.1111-1115, August 2004
T.Ideguchi and T.Naganawa, IEICE Trans.Commun., Vol.J89-B,
No.11, pp.2151-2154, November2006
T.Ideguchi, Y.Takahashi and S.Ogata, IEICE Trans.Commun.
Vol.J93-B, No.4, pp.725-729, April 2010.
◆Contact e-mail：tideguti at ktmail.tokai-u.jp
※at = ＠
Low power analog-digital converter
Bridge to the digital world from the real world
Topics：Integrated Circuit・Circuit Design・IC layout designs
Principal investigator: Prof. Kuniaki Fujimoto
An analog-digital converter (AD Converter) is a
semiconductor device widely used to convert
analog signals into digital signals. It is more
desirable to reduce the power consumption of this
devise, since it occupies a large proportion of power
consumption of mobile electronics. Therefore, we
would like to develop an analog-digital converter
with low power consumption using the CMOS
low-powered circuits.
Fig.1 IC Layout
Fig.2 Chip
VIN
VO1
Originality
VO2
The CMOS circuits have good characteristics in
that the layout area and power consumption is small
compared to the operational amplifier and analog
comparator. However, the CMOS circuits can detect
only one voltage level. By shifting constant voltage
using capacitors, it is possible to detect multi
voltage levels using the CMOS circuits which
otherwise can detect only one voltage level. We
would like to develop an ultra low-powered AD
converter using this technique.
VO3
VO4
Fig.3 Simulation Result
VIN
VO1
VO2
VO3
Performance of the AD converter has a
significant impact on our daily life, because it is
incorporated into many personal electronic devices
such as mobile phones and air conditioner．Our
final goal is to develop an AD converter
low-powered and fast enough to be used widely as
parts of many cell phones.
VO4
Fig.4 Experimental Result
Published papers
[1] Hirotoshi Sasak, Kuniaki Fujimoto, Hirofumi Sasak, Mitsutoshi Yahar,
“A Dividing Ratio Changeable Digital PLL Using Multi-Phase Clock VCO
Unaffected by Input Frequency Change, ” ICIC Express Letters, Part B:
Applications, Vol.2(2011), No. 1, ,pp.125-130
[2] Hirotoshi Sasak, Takahiro Hirose, Kuniaki Fujimoto, Hirofumi Sasak,
Mitsutoshi Yahara, “A Multi-Phase Clock Type Voltage Controlled Oscillator
Used As Base Clock in Digital PLL,” ICIC Express Letters,Vol.4(2011),
No.6(A), pp.2213-2218
◆Contact e-mail：shigeru at keyaki.cc.u-tokai.ac.jp
※at = ＠
Study of the sound signal of atmospheric pressure plasma
using laser beam
Development of the new measurement method using Fraunhofer effect
Topics：light diffraction・sound wave・computed tomography
Principal investigator: Prof. Toshiyuki Nakamiya
The atmospheric pressure plasma (APP) has an
excellent feature that it’s possible to generate with a
comparatively simple device. The applied research
is widely advanced from gas phase reaction (ozone
synthesis, removal of the environmental pollutant,
etc.) to creation of new material (CNTs, DLC, etc.)
and biomedical application. However, the details of
APP are hardly understood. In this theme, we have
aimed to visualize the intensity distribution of the
sound signal, and to clarify the effectiveness of
sound information.
Fig.2. Top view of sound source and
relation between the coordinates of
( x, y ) and ( x, y) .
Originality
Fig. 3. Experimental setup to detect the sound of discharge.
t)
0.80
0.70
.u ni
ity (arb
In tens
When the air molecule ionizes by the
atmospheric pressure, it hardly understands
how it becomes, and what it exist. The
longevity of the ion and the radical are long in
the low-pressure plasma and comparatively easy
to detect. However, it is difficult in the
atmospheric pressure. The clarification of the
pressure wave caused by the partial discharge
is somewhat reported. The phenomenon
clarification of APP using sound signal is not
found.
0.60
0.50
0.40
0.30
0.20
0.10
-16
-12
-8
-4
y
(m
)
m
The precise analysis of the sound signal
in APP may be possible to get the physical
quantity (the kind, the state, and the partial
pressure of generated gas molecule) that
cannot be easily measured by current
methods. Then the low price equipment is
expected that can measure the density of
ozone in real time by accuracy. In addition,
the phenomenon clarification of plasma wave
motion and the blowing power of the plasma
actuator (ionic wind) are planned.
4
0
4
-4
8
-8
12
-12
16
Fig. 4. Reconstructed distribution
of supersonic wave of the sound
transmitter in the plane.
8
0
mm
12
16
)
x(
-16
Fig. 5. Reconstructed distribution of
the discharge sound in the plane.
T. Nakamiya, 1, Y. Iwasaki, F. Mitsugi, R. Kozai, T. Ikegami, Y. Sonoda, and R.
Tsuda, “Investigation of Electric Discharge Sound in Atmospheric Pressure Plasma
Using Optical Wave Microphone,” Journal of Advanced Oxidation Technologies, 14
(1), 63-70, 2011.
T. Nakamiya, F. Mitsugi, S. Suyama, T. Ikegami, K. Ebihara, Y. Sonoda,Y. Iwasaki,
S. Aoqui, H. D. Stryczewska, and J. Pawlat, “Acoustic Spectra Characteristics of
Atmospheric Pressure Plasma using Optical Wave Microphone, ” PRZEGLAD
ELEKTROTECHNICZNY (Electrical Review), 1/2011, 249-253, 2011.
◆Contact e-mail：nakamiya at tokai.ac.jp
※at = ＠
Experimental Studies of Electrical Discharge in Seawater
Electrical Discharge on Water Surface under Spark Discharge
Topics：spark discharge, water surface discharge, lightning on sea
Investigator: Nur Shahida Midi
Supervisor: Ryu-ichiro Ohyama
①
②
※ここに顔
※ここに顔
写真がは入
写真がは入
ります。
ります。
①
②
Impulse high voltage, V
Needle electrode
Electrical discharges on water surface had been
investigated for the interest of lightning discharges
that occurred on the surface of rivers, lakes and seas.
Furthermore, objects such as offshore wind turbines
are exposed to the hazards of lightning discharge on
sea surface due to their height of over 100 meters and
location in isolated areas.
This research aims to investigate the discharge
phenomenon occurred when lightning strike on
seawater surface.
Originality
5
20
15
40
9
130
590
8
40
40 15
1
2
3
4
5
6 7
To
oscilloscope
Acrylic
sheet
Current
probe
To
oscilloscope
Electrode system
To investigate discharge phenomenon occurred
when lightning strike on seawater surface, an electrode
system was developed as an imitation of sea condition.
Impulse high voltage is applied to the point electrode
to produce an imitation of lightning phenomenon on
sea surface. From there, the characteristics of
discharge on water surface were investigated. Besides
that, discharge current occurred due to water surface
discharge is measured. Also, electric field on water
surface and under water is also observed in this
experiment.
Discharge condition on tap water
From the experiments, we had observed that even
under the same input voltage, tap water and saline
solution (seawater) show different mode of discharge
condition. The condition is different in term of
existence of sprouting leader only on tap water
surface. This results in different mode of discharge
current distribution of the two solutions.
A point measurement using a measurement probe
on water surface and under water should be able to
produce a precise observation of discharge current and
electric field on water surface and also under water.
Discharge condition on saline solution
N.S. Midi, and R. Ohyama, “Distribution of Discharge Current in Stratified
Seawater under Impulse Discharges,” 2010 Annual Report IEEE Conf. on
Electrical Insulation and Dielectric Phenomena, vol. 2, pp.640-643.
N.S. Midi and R. Ohyama, “Experiment of Discharge Current over Water
Surface and Under Water by Spark Discharge,” Digest 2011 Institute of Electrical
Engineers of Japan National Convention, vol. 1, p.80.
N.S. Midi, and R. Ohyama, “Distribution of Discharge Current in Stratified
Seawater under Impulse Discharges,” 2011 IEEE Conf. on Electrical Insulation
and Dielectric Phenomena, (accepted)
Highly Efficient and High Performance Networking
A Study on Low Power Consumption Ad Hoc Network in emergency
Topics：Ad hoc network, Power saving system
Principal investigator: Hiroshi Ishii (Professor)
Keeping communication ability in case of
disaster such as the Tohoku Earthquake is a
very important and crucial issue. In
disasters, essential network information is
lacking and power infrastructure support
communication network may be out of order.
Hence, this research will clarify how to
configure the network in the situation of
power and information lacking just after the
disaster
Originality
Our research makes the most of ad hoc
network enabling battery driven multi-hop
communication without network infrastructure.
Original
contributions
are
algorithms achieving: 1)Discovery (asylum,
hospital), 2)Distribution of information
(emergency
broadcasting),
3)
Secure
communication ad needed, and 4) Keeping
performance of communication.
Our research "Ultra Low Power Data-Driven
Networking System" is sponsored by Core
Research for Evolutional Science and
Technology (CREST), JST (Japan Sciene and
Technology Agency). So far, four algorithms
above are verified their effectiveness and the
consumed power will be probably reduced to
1/10 of the present systems. Through patents
and papers, the research is giving important
impacts to the society.
Effective info. discovery
- Keisuke Utsu, Hiroaki Nishikawa, and Hiroshi Ishii, “Broadcast Video
Streaming by Load-aware Flooding over Ad Hoc Networks achieving Reduction
of Traffic and Power Consumption”, the 2011 International Conference on
Parallel and Distributed Processing Techniques and Applications (PDPTA’11) ,
Jul. 2011
- Keisuke Utsu, Hiroshi Ishii, “Load-aware Flooding over Ad Hoc Networks
enabling High Message Reachability and Traffic,” The 5th International
Conference on Mobile Computing and Ubiquitous Networking (ICMU 2010),
pp.164-165, Apr. 2010
◆Link：http://www.u-tokai.ac.jp/international/twave/index.html#/hiroshi_ishii/index
◆Contact e-mail：ishii164 at tokai.ac.jp
※at = ＠
http://ishiilab.net
Bipolar plate coated with electrically conductive
CNT/PTFE composite film for fuel cell
Topics：Carbon nanotube (CNT), Fuel cell
Electrically conductive anticorrosion coating
Principal investigator: Prof. Yoshiyuki SHOW
(a) Powder
CNT
Fuel cell is one of candidate clean energy
sources, because of environmentally-friend and
high efficient energy conversion. In this study,
electrically conductive composite film consisting of
carbon nanotube (CNT) and fluorocarbon resin
(PTFE) was formed and was coated on bipolar
plates of a fuel cell in order to prevent corrosion of
bipolar plate surface and to increase the power
generation efficiency.
(b) CNT
dispersion
Fig. 1. (a) The fluid made by mixing
the powdered CNT into the PTFE
dispersion as a reference. (a) The fluid
made from dispersions of the CNT and
the PTFE. The CNT was
well-dispersed in the PTFE dispersion.
Originality
Voltage (V)
The dispersion fluid and the composite film
consisting of CNT and PTFE were formed for
anticorrosion coating of bipolar plate for a fuel cell.
CNT is hardly dispersed in water, because it has
cohesive property. In this study, the dispersion fluid
of CNT and PTFE was successfully formed by
addition of cellulose dispersion. Moreover,
composite film with electrical conduction and
chemical stability was formed by using this
dispersion fluid.
0.8
0.6
Coated
0.4
Bare
0.2
3.0
Power (W)
Coated
The fuel cell using the bipolar plates coated with
this anticorrosion film was fabricated and was
characterized. The fuel cell using bare stainless
steel bipolar plates showed maximum electric
power of 1.7W. When the anticorrosion film was
coated, the maximum power was increased up to
2.7W. This result indicates this anticorrosion
coating is a promising process to increase output
power of fuel cells
2.0
Bare
1.0
0
0
2
4
6
8
Current (A)
10
Fig. 2 The dependence of the current on
the voltage and the electrical power
generated by fuel cells.
◆Contact e-mail：show at keyaki.cc.u-tokai.ac.jp
※at = ＠
Research on oxide-semiconductor devices
Functional metal-oxide thin film technologies
Topics：phase transition oxide, reactive sputtering
Principal investigator: Prof. Kunio Okimura
Collaborator:
Collaborator:
Developments of various electronic materials
and devices support continuous progress of
advanced technologies.
In this laboratory, functionalities of metal
oxide, such as vanadium dioxide, are investigated
with aims of realizing next generation electronic
devices based on oxide semiconductors. We
developed fabrication method such as new
sputtering technology in order to achieve
characteristic thin film deposition.
Reactive Sputtreing Setup (→)
ICP-assisted sputtering (↓)
Originality
We have reactive sputtering setup in the
laboratory, which are served for deposition of
oxide thin films. ICP-assisted sputtering
method in which energetic ions assist low
temperature film deposition is a powerful tool
for development of new devices. Electronic
properties are also important parameters for
realizing electronic devices.
R-T characteristics of VO2(↑)
(←)Planer device using VO2
Vanadium oxide is known to be an oxide
which shows metal-insulator transition (MIT)
phenomenon
against
temperature.
The
realization of the MIT triggered by electric field
and light irradiation pushed this oxide towards
potential candidate for electronic fast switching
device. We mainly study to fabricate VO2 and to
achieve vertically aligned switching device.
◆Link：http://www.ei.u-tokai.ac.jp/Lab_Okimura.html
Y. Nihei, Y. Sasakawa and K. Okimura：Advantages of Inductively Coupled
Plasma -Assisted Sputtering for Preparation of Stoichiometric VO2 films with
Metal-Insulator Transition, Thin Solid Films, Vol.516, pp.3572 -3576 (2008).
K.Okimura, Nurul Ezreena, Y. Sasakawa and J.Sakai：Electric Field-Induced
Multi-Step Resistance Switching Phenomena in a Planer VO2 / c-Al2O3 Structure,
Jpn. J. Appl. Phys., Vol.48, No.6, 065003 (6pages) (2009).
K. Okimura, J. Sakai, and S. Ramanathan：In-situ X-ray diffraction studies on
epitaxial VO2 films grown on c-Al2O3 during thermally induced insulator-metal
transition, J. Appl. Phys. Vol. 107, 063503 (5pages) (2010).
K. Okimura and Y. Suzuki：Epitaxial Growth of V2O3 Thin Films on c-Al2O3 in
Reactive Sputtering and Its Transformation to VO 2 Films by Post-annealing, Jpn. J.
Appl. Phys., Vol.50, No.6, 065803 (5pages) (2011).
◆Contact e-mail：okifn at keyaki.cc.u-tokai.ac.jp
※at = ＠
Advanced eco electric vehicle
Development of ultra high efficiency electric vehicle
Topics： Solar car・Electric vehicle・Fuel cell vehicle
Principal investigator: Prof. Hideki Kimura ①
The new generation cars that run by using a
variety of renewable energy sources are
necessary to against the oil depletion and
global warming. We develop the energy
conservation electric vehicle by using the
clean energy such as the solar array, fuel cell
and the battery.
Originality
96-97%
Solar car “2009 Tokai Challenger”
efficiency
brushless
DC
motors
applied iron based amorphous have been
developed.
The
light
weight
and
low
aerodynamic drag body realized by carbon
fiber reinforced plastic (CFRP) by using 3D
CAD and CFD.
The solar car “Tokai Challenger” developed
for “World Solar Challenge 2009” and “South
Fuel cell vehicle “Faraday’s Magic 2”
African Solar Challenge 2010” has become a
winner of the race. The fuel-cell vehicle
“Faraday’s Magic 2” was also winner of the
“World Econo Move”. Next solar car is
developing just now.
◆Link：http://www.eu.u-tokai.ac.jp/kimura/index.html
◆Contact e-mail：nondisclosure
Material Science
and
Chemistry
Material Science and Technology
Materials Research for Advanced Science and Technology
Breakthrough for safety life
Topics：Materials for Aerospace.
Principal investigator: Prof. Yoshitake Nishi ①
Collaborator: Associate Prof. Mitsuo Iwase ②
Collaborator: Assistant Prof. Michel Faudree ③
①
③
②
The bird strike accidental fall occurred on the
Hudson river of A320-airbus of US AIRWAYS
(2009, January, 16th). To prevent the bird strike,
Electron Beam Irradiation (EBI), which enhances
the stiffness, fracture strain and tensile strength of
carbon fiber, was performed. EBI also enhances the
Charpy impact value , which is 2.4 times larger than
that before HLEBI (58 kJ/m2) at mid point fracture
probability.
EBI remarkably raises the bending strength and
fracture strain of CFRP.
Originality
15
Compressive stress σ （kPa）
The originality concerns concepts of EBI effects
on mechanical properties of Fiber-Reinforced
Polymers (FRP), which are foreseen to play an
important role as structural materials for their high
fracture stress and lightweight (aeronautic
applications). The results of a strengthening effect
and a significant increase of fracture stress of
irradiated FRP will be expected.
0Mrad
150Mrad
120°
C/C
10
CF
CF
5
0
0.0
(The NIKKEI
WEEKLY,
2005,Feb21st、
日経産業新聞
2005/1/17)
0.1
0.2
Compressive strain ε
0.3
C/C
< Academic Record (1977-2010March)>:
Paper (Journal with formal referees and Impact
factor) = 284 (242), Conference Proceedings
(International conference) > 217 (>110), Review:
13, Book: 7, Patent: 32 (47th in Japan University
2009), Prize: 31, News paper reported: 16, Invited
lecture (International): 37(20), and Chairman of
International Conf. (Co-chair): 3 (2).
①The C/C composites
developed by ACROSS
exhibits the spring function
at 2000℃.
② However, the weak spring
force is serious problem, as
shown in the coil stress
strain curve in Fig.
③ To reinforce the spring
force, HLEBI has been
performed. It enhances the
spring constant. The linear ss relationship is obtained.
Spring constant k (N/mm)
Effects of EB irradiation on spring
constant of C/C composite coil, Y. Nishi,
N. Uchida, A. Kimura, A. Mizutani, K.
Oguri, A. Tonegawa, J. Materials
Science, 38 (2003) 2215 -2218.
DB
20
180°
Vacant
site
DB
15
10

Ã 0.15
5
0
100
200
300
Irradiation dose (Mrad)
1:High fracture resistance of carbon fiber treated by electron beam
irradiation, J. Materials Research,16(6)(2001)1632-1635.
2:Effect of peening on structure and volume in a liquid-quenched
Pd0.835Si0.165 glass, Phys.Rev.B.37 (1988)2855-2860.
3:Solid-Liquid interfacial energy of Ni40Pd40P20 alloy glass,
Phys.Rev.B,34(1986)1792-1794.
電子線照射し、絶縁性を示す Y 系超伝導体試料における Tc の回
復過程と高 Tc 処理の可能
性を示唆した。この基礎研究は英国ケンブリッジ大学で開発した
ジョセフソン素子開発の
研究に引用。Effect of aging on Tc of YBa2Cu3O7-y irradiated
electron beam,
J.Appl.Phys.70(1991)367-371.
傷が付き難く、赤外線の透過率が高いことによりガン手術に効果
Preparation of cathode materials for a lithium-ion battery
using environmentally benign methods
Toward High performance Cathode Materials
Topics：Lithium Ion Secondary Battery, Cathode materials, Powder Preparation
Principal investigator: Prof. keiichi Katayama ①
Collaborator: Associate Prof. Masashi Higuchi ②
①
②
The interest in lithium-ion batteries in
large-scale power source applications such as
electric vehicles (EVs) has been significantly
increased in recent years. Important factors
with regard to the use of these batteries are
low cost, environmental safety, good
cyclability and a high specific capacity.
Manganese-based lithium metal oxides and
lithium iron phosphates were considered to
be promising cathode materials for
lithium-ion batteries
電子レンジを利用したマイクロ波合成装置の写真
Originality
High-performance cathode materials
for
lithium-ion secondary batteries are requisite in
various fields, and have been synthesized using
several methods. Especially, environmental
friendly powder preparation methods such as a
microwave heating method and a solvothermal
synthesis method have been found to be useful
for producing cathode materials. Final goal of
the present work is to produce cathode
materials for for electric vehicles application.
Lets study to accomplish this goal and our day
will come!
Demonstration of Microwave Synthesis for
preparing cathode materials.
4.4
3.4
4.2
3.2
4.0
3.0
3.8
2.8
マイクロ波合成
3.6
市販品
3.4
Voltage：3.4~2.4V
Rate:C/6
Voltage / V
Voltage vs. Li/Li+/V
Environmental-friendly powder synthesis
methods such as a microwave heating one
and solvothermal synthesis one have been
used for preparing lihtium ion secondary
batteries' cathod materials. Those methods
produced minute powders suitable for
cathodes materials efficiently and quickly,
and their electrochemical properties of the
powders such as LiMn2O4 and LiFePO4
were far better than those of commercially
available ones.
0
20 40 60 80 100 120
Specific Capacity/mAhg-1
Initial Discharge Curves of
LiMn2O4
prepared
using
Microwave Synthesis and
commercially available one.
2.6
2.4
0
x1 = 0.30
x1 = 0.15
x1 = 0
25 50 75 100 125
Specific capacity / mAhg-1
Initial Discharge Curves of
Li4-2XNi3XMn5-XO12
prepared using Molten Salt
Synthsis.
M. Higuchi, K. Suzuki, K.Katayama, T. Nakamura, A. Kagohashi, A. Kinoshita,
H. Suzuki, Key Engineering Materials Vol. 445(2010) pp. 113-116
T. Kishiki, M.Higuchi, T.Asaka, Y.Azuma, K.Katayama, Key Engineering
materials Vol. 421(2009) pp. 235-238
T. Kishiki, M.Higuchi, T.Asaka, Y.Azuma, K.Katayama, Key Engineering
materials Vol. 388(2008) pp. 281-284
K. Katayama, J. the Soc. of Inorg. Materials, Japan Vol. 15(2007) pp. 42-49
Chemistry of Selenium and Protein Folding
Organic Chemistry Approaches to Biological Problems in Life Science
Topics： Selenium, Organic Synthesis, Proteins, Molecular Simulation
Principal investigator: Prof. Michio Iwaoka
To elucidate biological problems from the
viewpoint of organic chemistry, we are studying on
(1) model reaction systems of selenium-containing
enzymes, (2) the principle of protein folding, (3)
synthesis and applications of seleno amino acids, and
(4) development of a new protein force field.
In our laboratory, we approach intriguing biological
phenomena from the both sides of experiment and
theory.
Originality
Selenium is a unique element, which has low
chemical
potentials
of
oxidation
and
reduction. Taking advantage of this feature,
we succeeded in carrying out new organic
and
biological
reactions.
We
further
developed a new protein force field on the
basis of single amino acid potentials (SAAP).
The new reactions for the synthesis of
selenocysteine and selenopeptides developed
in our laboratory will be applied to the design
of new selenium antioxidants. The research
on the mechanism of protein folding will have
impacts on elucidation of protein misfolding
diseases, such as Alzheimer’s disease.
S. Yoshida, et al., Angew. Chem. Int. Ed., 2011, 50, 2125–2128.
K. Arai, K. Dedachi, M. Iwaoka, Chem. Eur. J., 2011, 17, 481–485.
K. Arai, F. Kumakura, M. Iwaoka, Biochemistry, 2010, 49, 10535–10542.
M. Iwaoka, et al., Bull. Chem. Soc. Jpn., 2010, 83, 935–941.
F. Kumakura, et al., Eur. J. Org. Chem., 2010, 440–445.
M. Iwaoka, et al., J. Comput. Chem., 2009, 30, 2039–2055.
M. Iwaoka, et al., J. Biochem., 2008, 144, 121–130.
◆Contact e-mail：miwaoka at tokai.ac.jp
※at = ＠
Synthetic study of highly functional polymer
Functional polymers for environmental protection and biocompatible materials
Topics：Separation membrane･Biocompatible material･High performance polymer
Prof. Yu Nagase
Separation technique using polymer membranes has
been focused in much attention as an energy-saving
technology. We have developed novel membrane
materials which established the efficient removal of
toxic organic compounds or carbon dioxide from the
environment. In addition, the highly biocompatible
and durable polymer materials have been investigated
for the medical use. Several new polymers have been
created by our research cycles of (1) molecular
designs, (2) syntheses and (3) evaluations.
Originality
R
The obtained membrane material, which consisted
of polydimethylsiloxane graft copolyimide, exhibited
the high selectivity for organic components, and the
very thin films of m size could be prepared. Then,
the introduction of phosphorylcholine (PC) group into
polyamides and polyurethanes has been achieved by
preparing novel monomers containing PC unit, to
develop the highly biocompatible and mechanically
strong polymer materials. We have confirmed the
efficiency of our designed and synthesized polymers.
H2N
R
O
O
R
NH2
CH2 OCH2 CH2CH2
H2 N
CH3
CH3
Si O
Si C4H9
CH3
R
O
CO
NH2
O
x CH3
O
y
P
OCH2CH2 N+(CH3)3
PC diamine (R = H or CH 3, m = 1 or 3)
HOCH2 CH2O
OCH2CH2 OH
NH2
CH2 CH2O
m
O-
O
R
O
O
C O CH2 CH2O
PDMS macromonomer (R = H or CH3 )
H2N
R
O
O
CH2 CH2CH2
CH3
CH3
Si O
Si C4H9
CH3
C O CH2 CH2O P
OCH2CH2 N+(CH3)3
O-
O
PC diol
x CH3
PEO/PDMS macromonomer (R = H or CH 3)
CH=CH2
R
H2N
O
O
N
CO
CH2 CH2O
O
Our membrane materials could efficiently remove
the toxic organic components, such as benzene and
dichloromethane, from the dilute aqueous solutions. It
is expected that this membrane would be useful for the
waste water treatment in the industry. On the other
hand, the mechanical properties of our biocompatible
polymers could be controlled by changing the main
chain components according to any demands of
medical applications, for example, artificial bone,
joint, lung, heart and blood tube.
N
NH2
y
N
CH3
PEO macromonomer
N
R
INC monomers
Original Monomers in Nagase Lab.
Y. Nagase, T. Ando and C. M. Yun, “Syntheses of siloxane-grafted aromatic
polymers and the application to pervaporation membrane” Reactive & Functional
Polymers Vol. 67 (2007) pp. 1252-1263
Y. Nagase, M. Oku, Y. Iwasaki and K. Ishihara, “Preparations of aromatic
diamine monomers and copolyamides containing phosphorylcholine moiety and
the biocompatibility of copolyamides” Polymer Journal Vol. 39 (2007) pp.
712-721
Y. Nagase, S. Nakajima, M. Oku, Y. Iwasaki and K. Ishihara, “Synthesis and
properties of segmented poly(urethane-urea)s containing phosphorylcholine
moiety in the side-chain”, Polymer Journal, Vol. 40 (2008) pp. 1149–1156
◆Contact e-mail：yunagase at tokai-u.jp
※at = ＠
X
X
R
Geochemical evaluation of volcanic activity
Mitigation of volcanic hazard through capacity building in global scale
Topics：Magma, Gas, Volcanic lake, hot spring water
Principal investigator: Prof. Takeshi OHBA
Volcanic activity is one of the aspects of earth
evolution. We have benefited from volcanoes and
suffered by the disaster. Many people are living
around active volcanoes. The accurate evaluation
of volcanic activity is necessary. In this study, we
focus on the geochemical monitoring for active
volcanoes. Volcanic lakes are the noticeable target
for the monitoring because they accumulate
magmatic volatile in lake water. Lake Nyos is a rare
case where CO2 gas is dissolved in deep lake water.
The mechanism is one of the objects of research.
Originality
Field experiment to detect a back scattered Raman light emitted
Although the seismic observation is the principal
player in volcanic study, geochemical observation is
recently drawing attention. The volatile substance
emitted from magma is transported to surface as
fumarolic gas, hot spring water and volcanic lake
water. The chemical composition changes in
response to the volcanic activity, for example,
CO2/H2O ratio of fumarolic gas increase before or
during volcanic unrest. The Mg/Cl of acidic lake
water increases sharply prior to the unrest.
from the irradiated volcanic gas
One downside of geochemical observation is the
sampling and analysis based on manual operation. A
preliminary study to detect chemical components in
fumarolic gas and lake water is carried out by use of
laser emission. One important aim of volcanology is
the mitigation of hazard. Developing countries are
requesting the international cooperation in volcanic
monitoring. We are accepting foreign students in
the countries to build their capacity in terms of
sustainable monitoring research.
On the rim of Lake Nyos crater, Cameroon
Ohba, T., Y. Daita, T. Sawa, N. Taira and Y. Kakuage, Bull. Volcanol.,
73 (2011) p457-469.
Ohba, T., K. Nogami, J. Hirabayashi, T. Sawa, K. Kazahaya, N.
Morikawa and M. Ohwada, Annals Geophysics, 54 (2011) p187-197.
Ohba, T., J. Hirabayashi, K. Nogami, M. Kusakabe and M. Yoshida. J.
Volcanol. Geotherm. Res., 175 (2008) 120-132.
◆Contact e-mail：takeshi_ohba at tokai-u.jp
※at = ＠
High performance superconductors and its applications
Advanced superconducting wires and tapes for magnets
Topics：MgB2 superconductor, YBCO current leads, critical current
Principal investigator: Prof. Yutaka Yamada
Superconductivity is a key technology of 21st
century in the fields of transportation as
MAGLEV train, energy as transmission cable and
SMES, medicine as MRI, and information &
communication as advanced computer. We have
been conducting research and development into
high-temperature
oxide
superconducting
materials and metallic MgB2 superconductor for
their practical applications.
MgB2
wire
Originality
Superconducting Magnet
MAGLEV: JR Tokai
It is not easy for high temperature oxide such
as Y-based and Bi-based superconductors and
MgB2 to form wires and tapes because of their
hard and brittle properties. We have been
developing the original processes of hot pressing
and diffusion process to obtain dense and
oriented structures. The former is to press MgB2
core during heat treatment, and the latter is a
mutual diffusion process synthesized through Mg
tube and Boron powder at lower temperature than
melting point of Mg.
Y-based: YBCO current leads with large
transport current and small heat leakage have
been
promising
for
conventional
and
cryogen-free superconducting magnets. MgB2
thin wires sheathed with stainless steel have been
developed in original level sensor for liquid
hydrogen which is essential in hydrogen society
near future
Y. Yamada, Y. Ishii, S. Sakai, K. Shiohara, K. Tachikawa, Y.
Aoki, A. Kaneko, T. Koizumi, H. Tamura and T. Mito, IEEE
Trans. Appl. Supercond., Vol. 21 (2011) pp. 1054 - 1057.
Y. Yamada, K. Shiohara, S. Sakai, Y. Ishii, K. Tachikawa, T.
Koizumi, Y. Aoki and T. Hasegawa, IEEE Trans. Appl.
Supercond., Vol. 20 (2010) pp.1714-1717.
Y. Yamada, M. Nakatsuka, A. Nitta, K. Tachikawa and H.
Kumakura, IEEE Trans. Appl. Supercond., Vol.17 (2007) pp.
2911-2914.
◆Contact e-mail：yyamaday at keyaki.cc.u-tokai.ac.jp
※at = ＠
High-performance electronic materials and novel synthesis
Electronic properties of inorganic materials
Topics： Electronic materials, Nano-technologies, Quantum structures
Principal investigator: Prof. Masafumi Chiba
How do we best utilize resources and materials?
This is a question directed not only to our country
but also to the whole world. We need to search for
new materials using nanotechnology and take a
strategic approach in exploring their acceptance,
influence, and future in different fields. Owing to
the shortage of rare earth minerals, we focus on the
development of substitute materials and
scientifically
examine
the
possibility
of
technological innovation and development.
Transparency
conductive thin film.
Originality
We are developing new functional films without
the use of rare and expensive elements. For
example, we aim to create transparent conductive
materials and further improve their characteristics.
While conventionally available materials used were
oxides with rare metals, we are trying to discover
new materials with elements for which we do not
have to be concerned about the exhaustion of
resources. Furthermore, the synthesis of these
materials can also be an interesting subject of study.
Newly
liquid
phase
deposition apparatus.
Our goal is to devise new film-forming
technological alternatives to the conventional
vapor-phase and liquid-phase techniques. We have
so far succeeded in developing new quantum hybrid
materials with different types of ions uniquely using
magnesium hydroxide as the base frame. It would
be possible to develop a desired function if we
could calculate the molecular orbit energy from the
state of the ion in each lattice point and handle it
freely.
DOS of Mg-OH 45
model clusters. Published papers from the group
- M. Chiba, M. Higashi, H. Kiyota, M. Maizono, and T. Kuji: Suppl. Proc. of the
Minerals, Matals and Materials Society, 3, 605 (2011).
- H. Kiyota, M. Higashi, M. Chiba, and T. Kurosu: Proc. of the Material Research
Society 2010 Fall Meeting, 1282, a05-33 (2011).
- M. Higashi, H. Kiyota, T. Kurosu1, and M. Chiba: Jpn. J. Appl. Phys. 50,
061502 (2011).
◆Contact e-mail：carl at tokai.ac.jp
※at = ＠
Studies on the Synthesis of Amino Acids and
Peptides Labeled with Stable Isotopes
Topics：Stable isotope labeling, Amino acid, Peptide, Structural analysis
Principal investigator: Makoto OBA
Stable isotope-labeled compounds are widely
used as a non-radioactive tracer in chemical,
biological and environmental processes. In
particular, labeled amino acids are useful for
stereochemical studies on the enzymatic reactions
and for determining the 3D solution structure of
peptides and proteins by NMR spectroscopy. In
addition, such amino acids are paid attention in
medicinal chemistry because some of them show
biological activity.
Originality
In the light of above background, we have
recently been engaged in the stereoselective
synthesis
of
amino
acids
regioand
stereoselectively labeled with stable isotopes such
as D, 13C, and 15N. The selective replacement of one
of diastereotopic hydrogens and methyl groups with
deuterium atoms is the most important technique
for the NMR structural analysis. 1H NMR spectra of
labeled prolines and leucines, prepared in our
laboratory, for the first time, are shown in Figure 1.
and 2.
Figure 1. 400 MHz 1H NMR Spectra of Deuterated Prolines
The obtained labeled amino acids facilitate the
stereospecific assignments for the diastereotopic
proton signals, which are indispensable for the
precise structural analysis. Using the assigned
signals as an analytical probe, we can determine the
3D solution structure of amino acids and small
peptides through spin-spin couplings and NOEs.
For larger peptides and proteins, selective 13C
labeling is useful to extract interesting signals by a
2D NMR technique such as HSQC.
Figure 2. 400 MHz 1H NMR Spectra of Labeled Leucines
1) M. Oba, K. Tanaka, K. Nishiyama, W. Ando, J. Org. Chem. 2011, 76,
4173–4177; 2) M. Oba, T. Kondo, K. Tanaka, S. Koguchi, K. Nishiyama, J.
Organomet. Chem. 2011, 696, 982-985; 3) M. Oba, Y. Okada, M. Endo, K.
Tanaka, K. Nishiyama, S. Shimada, W. Ando, Inorg. Chem. 2010, 49,
10680-10686; 4) Y. Okada, M. Oba, A. Arai, K. Tanaka, K. Nishiyama, W. Ando,
Inorg. Chem. 2010, 49, 383-385; 5) M. Oba, Y. Okada, K. Nishiyama, W. Ando,
Org Lett. 2009, 11, 1879-1881.
◆Link：http://http://www2.ncc.u-tokai.ac.jp/fa/nishi-oba/Lab.htm
◆Contact e-mail：moba at tokai-u.jp
※at = ＠
Advanced Nanoceramics
Nanoceramics by nano-size grain boundary
Topics：Nanoceramics, Nanocomposites
Principal investigator: Prof. Jun-ichi Matsushita
We are researching about nanoceramics and
nanocomposites in order to pull out properties
which ceramic materials have, such as
"electrical conductivity", a "thermal resistance",
"adsorbent, "fluorescence", or "bio-activity", to
the maximum extent. Our research about the
composition and evaluation of highly efficient
nanoceramics which controlled a crystal grain,
grain boundary phases, etc. by the nano-size
order is performed.
②Research journals
①Preparation for sintered body
Originality
Our researches about nanoceramics for new
creation of highly efficient are following:
(1) The environmental material field: Development
of the highly efficient photocatalyst material (joint
research (partially) with Tohoku University, Japan)
(2) The biomechanical material field: Development of
apatite bioceramics for dental material
(3) Energy material field: Development of boride
nonoceramics
for
excellent
thermal
neutron
③The samples of the Vickers hardness at high temperature
capturing (partial joint research with Korea Atomic
④High temperature hardness tester
Energy Research Institute, Korea)
⑤TEM photograph of the microstructure of the sample
Reference: The Ceramic Society of Japan, “New Research Cluster”
The motto of our laboratory is "possibility of a
success with a big pile of a small result." Let's do the
fundamental R&D about excellent nanoceramics for
which everybody was waiting eagerly together with
us, and hold a success!
1.
"Sintering
and
Mechanical
Properties
of
Chromium
Boride-Chromium
Carbide Composites", Materials Science Forum, 534-536, 1077-1080 (2007).
2. "Oxidation Behavior of Tantalum Boride Ceramics", Solid State Penomena, 124-126,
819-822 (2007).
3. "Preparation of Si infiltrated SiB6-TiB2 composites", Journal of Ceramic Processing
Research. 11, 1-5 (2010).
◆Contact e-mail：jmatsu at keyaki.cc.u-tokai.ac.jp
※at = ＠
Mechanical Engineering
and
Aeronautics and Astronautics
Mechanical Engineering and Aeronautics and Astronautics
Control of transportation electromagnetic levitation of flexible steel plate
Hybrid magnetic levitation system using permanent magnet
Topics：Electromagnetic levitation・Permanent magnet・Genetic algorithm
Principal investigator: Prof. Yasuo Oshinoya ①
Collaborator: Assistant Prof. Shinya Hasegawa ②
Collaborator: Graduate Student Takayoshi Narita ③
①
②
③
Magnetic levitation technology becomes
familiar to us, for example practical use of
MAGLEV. Generally, thin steel plates are conveyed
while in contact with rollers (Fig.1). This leads to
deterioration in the quality of the plate surface, such
as flaws and peeling of the plated layer. To solve
this problem, we proposed a hybrid magnetic
levitation control system for a thin steel plate using
the magnetic force (Fig.2).
(Fig.1) Manufacturing process of the steel plate
controller
Gap sensor
x
Originality
Electromagnet
z
The system suppresses the deflection of the
flexible steel plate, when installing a permanent
magnet where the attractive force of the
electromagnet is hard to reach. It is practically
impossible to search for the optimal position of the
permanent magnets by experiment because the
number of combinations of search patterns is huge.
Therefore, the optimal position is sought using a
genetic algorithm (Fig.3).
y
Permanent magnet
Steel plate
(30mm×30mm×15mm)
(800mm×600mm× 0.18mm, 0.24mm , 0.27mm)
(Fig.2) Hybrid magnetic levitation system
Currently, we are examining about the
magnetic levitation stability of the steel plate in
stationary condition. In the future, we will consider
that change the distance between the surface of each
permanent magnet and the thin steel plate, and
install a magnet of different strength. In addition,
we will search for an optimal placement in
transportation condition. Moreover, we aim to
search for an optimal placement which uses the
attractive force of the electromagnet as little as
possible and energy saving.
◆Link：http://www.ed.u-tokai.ac.jp/laboratory/oshinoya/index.html
(Fig.3)
Optimal placement of permanent magnet
using genetic algorithm
T. Narita, Y. Oshinoya, and S. Hasegawa，International Power Electronics
Conference-Sapporo2010，(2010-6)，CD-ROM.
T. Narita, Y. Oshinoya, and S. Hasegawa，16th International Conference on
Electrical Engineering，(2010), CD-ROM.
T. Narita, Y. Oshinoya, S. Hasegawa and H.Kasuya, Proc. Schl. Eng. Tokai
Univ., Ser. E 35, (2010), 41-46.
◆Contact e-mail：ossy at keyaki.cc.u-tokai.ac.jp
※ at = ＠
A study on riding comfort in a small electric vehicle
Optimal design of ride comfort using psychology and physiology information
by an active seat suspension
Topics：Small electric vehicle・Active seat suspension・Riding comfort
Principal investigator: Prof. Yasuo Oshinoya ①
Collaborator: Assistant Prof. Shinya Hasegawa ②
Collaborator: Graduate Student Hideaki Kato ③
※ここに顔
※ここに顔
※ここに顔
写真が入り
写真が入り
写真が入り
ます。
ます。
ます。
①
②
③
It has become important to pursue comfort,
automatic control and many more amenities for
future vehicles, until you do not realize you are
actually driving. Therefore, it is necessary to
develop intelligent vehicles using advanced
information technologies. A small electric vehicle
(Fig.1), which is becoming high in demand are used
to conduct a research to develop a high performance
vehicle that can help create a comfortable daily life.
（Fig.1）
Small electric
vehicle
Originality
Driving a small vehicle into the narrow and the
unpaved road is easy, but riding comfort
deteriorates because of the great influence of
vibration. In this study group, we propose an active
seat suspension (Fig.2) to control this vibration,
using a voice coil motor that is small and easy to
install. Moreover, riding comfort is evaluated
(Fig.3) by measuring psychology and physiology
information such as the heartbeat fluctuations, to
offer a comfortable ride.
（Fig.2）
Active seat suspension
A person's feelings are measured to optimize
riding comfort because it is ruled greatly by the
passenger's feelings (psychological condition). This
has to reflect in the regulating system of vehicles.
By forecasting the feature and sense of an
individual, and the preferences of riding comfort
using the driver's biological reaction, we aim to
realize a vehicle that offers better riding comfort.
（Fig.3）Experimental scenery and heart rate variability
measuring device
H. Kato, Y. Oshinoya, S. Hasegawa, H. Kasuya, Proc. Schl. Eng. Tokai Univ.,
Ser. E 35, (2010), 47-51.
H. Kato, Y. Oshinoya, S. Hasegawa, H. Kasuya, Proc. Schl. Eng. Tokai Univ.,
Ser. E 35, (2010), 53-57.
◆Link：http://www.ed.u-tokai.ac.jp/laboratory/oshinoya/index.html
◆Contact e-mail：ossy at keyaki.cc.u-tokai.ac.jp
※ at = ＠
研究テーマ
サブタイトル
Topics：
Associate Prpf. Kazuyoshi Tsuchiya
A typical diabetic patient needs to make between 5
and
7
painful
measurements
of
glucose
concentrations each day in order to stabilize their
blood sugar level system. In this study, a new
microneedle production technique to produce a
painless microneedle the same size as a mosquito's
labium, which is almost sucking blood painlessly, is
proposed.
Originality
A titanium microneedle the same size as a female
mosquito's labium was produced by the sputter
deposition method. The Ti was deposited onto a very
small diameter wire, which was rotated by a motor in
the chamber, and the wire material was removed by a
wet etching process. The technique can produce any
materials microtube, size and shape as well.
The technique can also deposit PZT film on the
titanium microtube, therefore we propose a new type
of
valve-less
micropump,
which
consists
of
piezoelectric rings located at equal intervals on the
tube and the waves in a tube fully filled liquid
becomes a progressive wave with an elliptic motion to
Kazuyoshi TSUCHIYA et. al. Precision Engineering Vol34(2010) 461-466
Kazuyoshi TSUCHIYA et. al. J. of Appl. Phy. Vol.103 (2008) 114701-1-9
Kazuyoshi TSUCHIYA et. al. Biomed. Microdevices Vol.7 No.4 (2005)
347-353
transport the liquid in the tube. Moreover, if practical
use to the micro needle for the medical treatment
◆Contact e-mail：tsuxhiya at tokai-u.jp
with the highest hurdle can be achieved by the
restriction of Pharmaceutical Affairs Act etc., and the
offer of the extra fine tube to a wide industrial field
※ at = ＠
Recognition and navigation of autonomous mobile robots
under an unknown environment
Flexible decision-making and optimal trajectory planning
Topics：autonomous robots, obstacle avoidance, sensor fusion, trajectory planning
Yoshio Yamamoto
As a recent advancement of robot technology is
expanding its applications to our daily life, a robot is
expected to operate under a variety of circumstances,
indoors or outdoors, while handling interactions with
humans or other robots. Moreover, the robot needs to
possess a flexibility to deal with unexpected scenarios.
As a benchmark, we participate “Tsukuba Challenge”
to test our robot system against different conditions.
Originality
For a symbiotic relationship between humans and
robots, not only intelligence but also reliability and
safety issues become very important. While a robot is
expected to determine its own location and state based
on a variety of sensors, it also needs to be able to
gracefully handle unforeseen situations.
Our goal is
to establish a control and planning scheme for
providing mobile robots with such high reliability.
safety measures.
Look-ahead control method employed in this study
can provide a robot with a smooth trajectory as well as
high mobility. Addition of an intelligent navigation
scheme to it will enable to build a friendly, reliable
robot for humans. This idea can be extended to a
multi-robot system or robot-human system which can
deal with a more difficult task that cannot be done
otherwise.
◆Link：http://www.es.u-tokai.ac.jp/yamamotolab.html
A. I. Cahyadi, P. Nugroho, Y. Yamamoto, “Hybrid Design of Passive
Mobile Robot Teleoperation System”, ECTI Transaction EEC, Vol. 8,
No. 2, pp. 232 – 238, 2010.
Y-C. Chang, Y. Yamamoto, “Path Planning of Wheeled Mobile Robot
with Simultaneous Free Space Locating Capability”, Intelligent Service
Robotics, Vol.2, No.1, pp. 9-22, 2009.
Y-C. Chang, Y. Yamamoto, “On-line Path Planning Strategy
Integrated with Collision and Dead-lock Avoidance Schemes for
Wheeled Mobile Robot in Indoor Environments”, Industrial Robot: An
International Journal, Vol.35, No.5, pp. 421-434, 2008.
A. I. Cahyadi, Y. Yamamoto, “Teleoperated 3-DOF Micromanipulation
System with Force Feedback Capability: Design and Experiments”,
Industrial Robot: An International Journal, Vol.35, No.4, pp. 337-346,
2008.
Contact e-mail:yoshio at keyaki.cc.u-tokai.ac.jp
※ at = ＠
Development of new detection methods for VOCs and active oxygen
QCM sensors for volatile organic compounds（VOCs） and active oxygen
Topics ： QCM (Quartz crystal microbalance ), VOC sensor, active oxygen sensor
Principal investigator: Prof. Satoru IWAMORI
Highly sensitive detection technologies for
volatile organic compounds (VOCs) and active
oxygen are required. The use of a quartz
crystal microbalance (QCM) is one such
method. In this Lab., a simple and high
sensitive monitoring technologies for VOC
gas and active oxygen have been developed.
A QCM sensor for active oxygen detection
Originality
developed by this research group
Organic thin films prepared by an r.f.
sputtering and spin coating were deposited
onto the QCM electrode. These thin films
indicate characteristic adsorption properties
for the VOCs and chemical reactions with
the active oxygen, respectively.
We have developed a new sensor for active
oxygen detection based on the QCM. This
sensor can be applied for various industries,
i.e., sterilization process in medical devices.
For example,
・ S.Iwamori, R.Sugimoto, K.Osada, M.Kurata, H.Matsumoto, K.Noda, “Gas
adsorption performance of organic thin films prepared by plasma-assisted vacuum
evaporation with polyimide precursors”, Sensors & Materials, Vol.22, No.7,
pp.347-356, (2010.10)
・S.Iwamori, T.Tanabe, S.Yano, K.Noda, “Adsorption properties of fluorocarbon thin
films prepared by physical vapor deposition methods” Surface & Coatings
Technology, Vol.204, pp.2803-2807, (2010.05)
・S.Iwamori, S.Yano, R.Sugimoto, A.Uemura, H.Matsumoto, K.Noda, “Adsorption
properties of thin films prepared by r.f. sputtering with a BPDA-PDA polyimide
target”, Japanese Journal of Applied Physics, Vol.49, 04, DK-18-1～5, (2010.04)
・ H.Matsumoto, M.Matsuoka, K.Yoshino, T.Iwasaki, S.Kinoshita, K.Noda,
S.Iwamori,” Monitoring of Surface Treatment Effects on Sputter-Coated Organic
Film under Atomic Oxygen and Ultraviolet Irradiation”, Chemistry Letters,
Vol.39, No.2, pp.102-103, (2009.12)
◆Contact e-mail：iwamori at tokai-u.jp
※ at = ＠
Improvement of mechanical properties of organic thin films
Studies for organic thin films with several tens nanometer coating thickness
Topics： sputtering, vacuum evaporation, spin coating, organic thin films
Organic thin films deposited onto metal,
inorganic and polymer substrates by an r.f.
sputtering, vacuum evaporation and spin
coating were evaluated to enhance their
mechanical,
adhesion
and
tribological
properties.
Originality
Organic thin films prepared by physical vapor
deposition (PVD), e.g., r.f. sputtering and
Plasma enhanced vacuum polymerization apparatus
plasma-enhanced vacuum evaporation, have
designed and produced by Iwamori lab.
different
characteristics
from
pristine
materials. In this Lab., growth mechanisms of
these organic thin films were investigated.
For example,
In this Lab., new evaluation technologies for
mechanical properties of thin films in a
microscopic
region
were
developed.
In
addition, a new evaporation apparatus for
coating of functional organic thin films was
designed and produced.
・上村彰宏，田部智也，岩森暁、
「ポリイミドをターゲットとした高周波ス
パッタ膜の成膜条件が薄膜に与える影響」電気学会論文誌 A （基礎･材料･
共通部門誌） Vol.130. No.2, pp.147-154,（2010.02）
・S.Iwamori, N.Hasegawa, A.Uemura, T.Tanabe, I.Nishiyama, “Friction and
adhesion properties of fluorocarbon polymer thin films prepared by magnetron
sputtering”, Vacuum, 84, pp.592-596, (2009.12).
・A.Uemura, K. Kezuka, S.Iwamori, I.Nishiyama, “Effects of substrate temperature
on the surface of polymer thin films prepared by R.F. sputtering with a polyimide
target”, Vacuum, 84, pp.607-611, (2009.12)
・S.Iwamori, M. Mizoguchi, I. Nishiyama，
“Adhesion and mechanical properties of
poly(tetrafluoroethylene) －poly(vinyl alcohol) composite thin films prepared by
spin coating method”，Polyimides and Other High Temperature Polymers，Vol.5,
pp.285-292，(2009.05)
・S.Iwamori，“ Adhesion and friction properties of fluorocarbon polymer thin
films coated onto metal substrates ” , Key Engineering Materials, Vol.384,
pp.311-320, (2008.09)
・岩森暁，毛塚和哉，上村彰宏，
「スパッタフッ素樹脂薄膜の分子構造と摩
擦・摩耗特性」、材料、Vol.57. No.6，pp.611-616，(2008.06)
・岩森暁，北拓也，
「ゴム基板上に形成したポリテトラフルオロエチレン真
空蒸着膜の摩擦特性と密着性」，日本機械学会誌論文集 C 編、74 巻 739 号，
pp.717-723，（2008.03）
※ at = ＠
Metal, inorganic and organic thin films deposited onto a plastic film substrate
Functional material thin films deposited onto a polyester film substrate prepared by PVD methods
Topics ： plastic film substrate, physical vapor deposition (PVD), sputtering, vacuum evaporation
Properties of plastic film substrate are
improved due to the metal, inorganic and
organic thin film coatings prepared by
physical vapor deposition (PVD) methods.
Originality
Tin (Sn) + zinc (Zn) alloy thin films
deposited on the polyester (PET) film
Vacuum forming properties of tin–zinc thin films
substrate by co-evaporation indicate an
deposited on polyester film substrate
excellent tensile property. Any micro-crack
（Optical micrographs of Sn (upper section) and Sn+Zn
cannot be found at the surface of Sn+Zn
(lower section) thin films before (A) and after (B) the
alloy thin film.
vacuum forming test. Any micro-crack cannot be found at
the surface of the Sn+Zn alloy thin film.）
Iwamori, et al., Vacuum, 84 (2009) 581.
Properties of polyester film substrate were
enhanced by
・Metal thin film coating：Excellent tensile
properties (Sn+Zn alloy)
・Inorganic thin film coating：Improvement
of gas barrier properties (silicon oxynitride)
・Organic thin film coating：Antireflection
properties (fluorocarbon)
For example,
・S. Iwamori, Y. Nagai, S. Seino, M. Kobayashi, K. Noda, “Optical properties of
fluorocarbon thin films deposited onto transparent film substrate by r.f. sputtering”,
ISSP2011 Proceedings (2011.07)
• S.Iwamori, T.Kita, S.Saitoh, S.Yano, K.Kaminoda, S.Ohnishi,K.Suzuki ， ”
Adhesion and vacuum forming properties of tin–zinc thin films deposited on
polyester film substrate”, Vacuum, Vol.84, pp.581-586, (2009.12)
•北拓也，斉藤翔，岩森暁，「ポリエステルフィルム上に成膜した金属蒸着
膜の引張特性と密着性」
，真空，Vol.51, No.3，pp.205-207, (2008.03)
・S.Iwamori, Y.Gotoh K.Moorthi, “Characterization of silicon oxynitride gas
barrier films”, Vacuum, Vol.68, pp.113-117, (2003.10)
・S.Iwamori, Y.Gotoh, K.Moorthi, “Silicon oxide gas barrier films deposited by
reactive sputtering”, Surface and Coatings Technology
Vol.166, pp.24-30,
(2003.03)
※ at = ＠
Measurement of cortical bone strain distribution by image
correlation techniques and from fracture toughness
Topics： Image correlation techniques・Cortical bone・Fracture toughness
Principal investigator: Prof. Hisao Kikugawa
It is necessary to evaluate crack initiation
and propagation after fracture because this
process may be different in the case of
injured bone tissues. In this study, we
attempted to analyze the strain distribution
on bone tissue surface by using image
correlation techniques in order to elucidate
the relationship between microscopic bone
damage and strain distribution.
Originality
Preparation of specimens from bovine femur.
This technique uses digital images taken
before and after deformation, permitting a
relatively
simple
and
inexpensive
measurement of strain distribution on the
surface of a material.
optical
system
magnification
By changing the
settings,
can
be
an
arbitrary
achieved.
This
technique is thought to be effective for the
measurement of biological tissue strain;
however, it has rarely been applied to
address such issues.
Typical load-displacement curve
and typical prefailure damage.
A strain analysis performed using image
correlation
techniques
allowed
the
visualization of the increased strain at the
forward end of the slit of the specimens.
H.Kikugawa, T.Asaka, M.Miyake:Mater.Trans.,
Vol.48,No.6(2007),1417.
M. Kuninori, H.Kikugawa,T.Asaka,H.Kasuya :Mater.Trans.,
Vol.50,No.2(2009),309.
H. Yamaguchi.,H.Kikugawa,T.Asaka,H.Kasuya :Mater.Trans.,
Vol.52,No.5(2011),1026.
◆Contact e-mail：kiku at keyaki.cc.u-tokai.ac.jp
Vol.50,No.2(2009),309
※ at = ＠
Optimum Design of Fluid Film Bearing Based on Lubrication Theory
Keywords： Optimum design, Fluid film bearing, Robust design
Researcher: Prof. Hiromu Hashimoto ①
Co-researcher: Associate Prof. Masayuki Ochiai②
Co-researcher: Doctoral student Yuta Sunami③
① Hashimoto, H.
② Ochiai, M.
③ Sunami, Y.
The fluid film bearings include oil film bearings
and air film bearings. Furthermore, air film bearings
are an effective way to improve the problems
related to Green-IT. However, its low viscosity
leads to low load and low stiffness of bearings.
The research aims in improving these problems
by finding new bearing designs.
Originality
New bearing designs had been discovered
through the application of a mathematical
programming approach. It has been experimentally
proven that by using the abovementioned method,
in comparison with a conventional bearing, new
design has about 5-10 times higher dynamic
stiffness.
(i) Groove geometry
(a) Optimized bearing
(ii) Groove geometry
(ii) Pressure distribution
(b) Spiral grooved bearing
Fig. Groove geometry and pressure distribution of optimized
bearing and spiral grooved bearing
Micorometer
Hydrostatic
air bearing
Ceramic ball
bearing
Currently, the aim is to eventually introduce air
bearings for HDD spindle motors. Apart from that,
a combination of robust design and optimum
design; robust optimum design, applied to bearing
design allows the manufacturing of bearings under
strict environmental conditions and bearing
tolerances.
◆Link：http://www.u-tokai.ac.jp/tt/index.html
(ii) Pressure distribution
Eddy curent
proximity
probe
Test
bearing
High frequency
motor
Rotor
Fig. Test rig for gas film thrust bearings
研究グループからの論文
1) Hashimoto, H., Tribology Transactions STLE, Vol. 40, No. 2(1997), 283.
2) Hashimoto, H. and Ochiai, M., Journal of Tribology ASME, Vol. 130, No.
3(2008), 031101.
3) Ibrahim, M. D., Namba, T., Ochiai, M. and Hashimoto, H., Journal of
Advanced Mechanical Design, Systems, and Manufacturing JSME, Vol. 4,
No. 1(2010), 70.
◆Contact e-mail：[email protected]
A Study on Web Handling Technology
Keywords： Roll-to-roll, Micro-grooved roller
Researcher: Prof. Hiromu Hashimoto ①
Co-researcher: Toshimitsu Kanda
(LINTEC Corporation)②
Co-researcher: Ryo Morikawa
(FUJI KIKAI KOGYO Co., LTD.)③
① Hashimoto, H.
② Toshimitsu, K.
③ Ryo, M.
Groove
[mm]
The trend of web usage for lithium ion batteries
and solar panel for green and renewable energy has
caught many attention recently. These products use
roll-to-roll method for mass production which
requires high precision of web handling technology.
Hence, the prediction and prevention of errors
during manufacturing is a necessity to obtain high
precision and stable web handling technology.
Fig. Micro-grooved roller
W
Web
bg
Originality
hg
Due to the high speed of transportation of web,
air enters between roller and web which creates
difficulties
transportation
them
efficiently.
Therefore, to prevent web slippage, the
micro-grooved roller was introduced. Through the
optimization of micro-grooves dimensions, the
transportation speed improvement was aimed and
verified experimentally.
h
Sg
b
ng : Number of groove
Micro-grooved roller
Fig. Concept of equivalent web spacing for circumferentially
micro-grooved roller
Web
Optical censor (LDV)
Road cell
By
introducing
concave
roller
and
micro-grooved roller, the wrinkles had been proven
preventable during transportation. Furthermore, a
more complicated and high precision of web
handling technology is aimed with the application
of optimization of dimensions of micro grooved
roller and concave roller.
heq
Driving motor
Tension control roller
Test roller
Driving roller
Speed controller
Tension unit
Fig. Overview of test rig
研究グループからの論文
1) Shinji Hikita and Hiromu Hashimoto, Journal of Advanced Mechanical Design
Systems, and Manufacturing, Vol. 4, p. 226-23.
2) Hiromu Hashimoto, Puttha JEENKOUR and Mongkol MONGKOLWONGROJN,
Journal of Advanced Mechanical Design Systems, and Manufacturing， Vol. 4, p.
214~225.
◆Contact e-mail：[email protected]
Active/Passive Hybrid Mechanism
Artificial finger using double planetary gear system
Topics：Artificial finger, Double planetary gear system, Back-drivability,
Inherently safe
Koichi Koganezawa
abduct./adduct.
Inherently safe is a crucial requirement for
robots working in a daily environment
co-existing with human in near future. It requires
“compliance” to the environment that the robots
will physically contact. It also requires a synergic
motion of multiple joints without much relying
on sensory feedback in a complex control system.
The study aims to develop mechanisms that
meet the inherently safe requirement mentioned
above.
compound four-bar links
Link 4
Link 5
axis
Link 1
Link 3
DIP joint
Double planetary
gear system
Link 2
PIP joint
MP joint
Artificial finger using DPGS
Originality
・We developed a finger mechanism consisting of
a planetary gear system that amalgamate an
active driving and a passive driving, which
provides synergy motion of the three joints of a
finger and the back-drivability.
・ We developed the “Double Planetary Gear
System (DPGS) that enables a finger
adduction/abduction.
１
2
3
4
Thanks to the properties of the developed
mechanisms mentioned above, they will gain a
wide range of application fields, such as a usage
in a personal care robot in home, hospital or
rehabilitative facilities.
Now we are developing a hand with multiple
fingers and hand prosthesis that is light weight
and all-in-one arrangement of parts.
Opening the screw-cap by two fingers
・K. Koganezawa, Back-drivable and Inherently Safe Mechanism for Artificial
Finger, Robotics Science and Systems, V, The MIT Press, to be appeared，2011.
・Y. Ishizuka and K. Koganezawa,A new mechanism of an artificial finger using
double planetary gear system，Journal of the Japan Robot Society，Vol.26, No.5,
pp. 699-710, 2008, in Japanese.
◆Contact e-mail：kogane at keyaki.cc.u-tokai.ac.jp
※ at = ＠
Space Propulsion with Laser-Electric Accelerator
Highspeed Plasma Generation with High-Power Density
Plasma
Topics：Space
propulsion, Laser induced plasma, Accelerator
Principal investigator: Hideyuki Horisawa
Propellant tape
Currently, there are urgent requirements for
microthrusters under rapid evolution of micro
spacecraft. Laser-electric hybrid acceleration, in
which laser induced plasma from solid target is
further accelerated by electrical means, can give
high-power density to the plasma and can induce
highspeed plasma beams. Since the system can be
compact, simple, and robust, fundamental studies on
utilization for spacecraft are being conducted.
Accel. electrode
B
j
+ + +
+ - -
Laser
Fig.1
Laser-electric
hybrid
acceleration
thruster:
(a)
Laser-electromagnetic acceleration hybrid mode, (b) Laser-electrostatic
hybrid acceleration mode.
Originality
In conventional acceleration mechanism, it has
been impossible to combine electrostatic and
electromagnetic accelerations in one thruster.
However, our system in this study enables this
combination. As a novel plasma source, not only for
spacecraft applications, but this system can further
be applied to material processing in industry. It is
significantly important that this can be one of new
seeds for both academic and engineering interests.
Rotation stage
Magnet (dumper)
Counter weight
Thruster
A pair of strings
Calibration electrode
Displacement sensor
Fig.2 Very-low thrust measurement system (photo
schematic).
and
8000
7000
Isp [sec]
6000
Since this system enables low thrust / high
specific impulse mode to high thrust / low specific
impulse mode, a compact and lightweight thruster
system with high robustness can be achieved. It is
further expected that this system enables flexible
operations to unexpected disturbance to spacecraft
on orbit, additional tasks for altitude or attitude
controls, etc. These can be the ultimate tasks for
micro spacecraft with formation flight operations.
5000
4000
3000
2000
1000
0
0.0
2.0
4.0
6.0
Charge energy [J]
8.0
10.0
Fig.3 Typical high-specific-impulse characteristics.
H. Horisawa, Y. Sasaki, T. Shinohara, I. Funaki, Trans. JSASS Space Tech. Jpn
Vol.8 (2010) Pb_33.
C. Phipps, H. Horisawa, et al., J. Propulsion & Power Vol.26 (2010) p609.
H. Horisawa, F. Sawada, S. Hagiwara, I. Funaki, Vacuum Vol.85 (2010) p.574.
S. Sumida, H. Horisawa, I. Funaki, Trans. JSASS Space Tech. Jpn Vol.7 (2009)
Pb_159.
T. Ono, Y. Uchida, H. Horisawa, I. Funaki, Vacuum Vol.83 (2008) p213.
◆Contact e-mail：horisawa at tokai.ac.jp
※ at = ＠
Elucidation of Breathing Flows in Respiratory Tract
Application of Fluid Dynamics to Living Body
Topics： Nasal Cavity, Paranasal Sinus, Nasal Conchae, Respiratory Flows
Associate Prof. Yoko Takakura ①
Collaborator: Prof. Masahiro Iida ②
Collaborator: Assistant Prof. Teruhisa Takeo
Collaborator: Research Associate Taku Atsumi
※ここに顔
①
※ここに顔
写真が入り
写真が入り
②
ます。 Model of Upper
ます。
Respiratory Tract (an example)
and Computational Results
In the respiratory system the nasal cavity with
paranasal sinuses has functions of ventilations,
drainage, olfactory sense. However, the roles of
paranasal sinuses and nasal conchae are not made
clear. The aim of the researches here is to clarify the
effects of paranasal sinuses, shapes of nasal
cavities, and shapes of tracheas to the breathing
flows by in vitro experiments and numerical
computations.
Originality
The roles of paranasal sinuses have not been made
clear. Further, about the effects of shapes of nasal
conchae and tracheas to the breathing flows nothing
definite are known. These phenomena in the living
bodies are simulated by in vitro experiments and
numerical computations, and comprehended from
the viewpoint of the fluid dynamics. The findings
are turned to use in treatments by operations.
Experimental scenery
The activities are increasing to clarify the flow
phenomena in living bodies through collaboration
between medical doctors and fluid dynamists. Also
our research group has obtained the findings that
inspiration and expiration has different influence to
the olfactory sense, since each dominant flow
passes through a different way within a nasal cavity.
Because of the new fields, there exists pleasure in
setting up aims.
Suzuki, C., Takakura, Y., Atsumi, T., Takeo, T., Iida, M., Saito, K.,
“Numerical simulation of flows in models of nasal cavities with
paranasal sinuses,” Annual Meeting 2011, Japan Society of Fluid
Mechanics, September 2011 (to appear).
Takakura, Y., et al., “Characteristics of Stents for Pipe Flows with an
Aneurysmal Model,” Transaction of the Japan Society of Mechanical
Engineers, Series B1, Vol. 74, 737, pp.16-24, January 2008.
◆Contact e-mail：takakura at tokai-u.jp
※ at = ＠
Oscillation of Flows about a Supersonic Parachute
Computational Fluid Dynamics (CFD) and Experimental Fluid Dynamics (EFD)
Topics： Parachute, Oscillatory Flows, High-accuracy Numerical Computation
Associate Prof. Yoko Takakura
Collaborator: Ptof. Toshiharu Mizukaki
①
②
※ここに顔
※ここに顔
写真が入り
写真が入り
①
②
ます。
ます。 Feedback Phenomena
by Vortex Shedding and
Pressure waves
When a space probe is made land on a planetary
with the atmosphere such as Mars, deceleration by
parachutes is considered, but the aerodynamic
characteristics are not well known. The supersonic
flows about a parachute oscillate by the interaction
between shock waves and vortices. The aim of the
researches here is to clarify the oscillatory flow
phenomena through high-accuracy numerical
computations and experiments.
Originality
The mechanism for oscillatory flows based on the
interaction between vortex generation and shock
waves has not been made clear. The series of
researches aim to capture the generation process
mainly by high-accuracy numerical methods and to
clarify the mechanism.
Interaction of vortices near edge of 凹 body to generate
pressure waves
On the 2D concave body we have reported the
followings: 1) pressure waves by initial disturbance
reflect at the body and propagate upstream; 2) the
pressure waves interact with the bow shock wave to
shed vortices downstream; 3) the vortices interact
with the flow field near the edge of the body to
yield the pressure waves propagating upstream; and
2) and 3) are repeated. The aim is to capture the 3D
phenomena and to construct a theory.
Takakura, Y., et al., “On the Flow Fields around a Concave Body in Supersonic
Flows,” Proc. 41th Fluid Dyn. Conf., Japan society for Aeronautics and Space
Sciences, 2008 June.
Takakura,Y., “Direct-Expansion Forms of ADER Schemes for Conservation
Laws and Their Verifications,'' Journal of Computational Physics, Elsevier,
Volume 219, issue 2, pp. 855-878, 2006.
◆Contact e-mail：takakura at tokai-u.jp
※ at = ＠
Incompressible Flows about Vehicles
Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD)
Topics：Optimized Shape, Aerodynamic Devices, Circular Cylinder, Critical Flows
Associate Prof. Yoko Takakura
※ここに顔
写真が入り
Requirements from ecology such as fuel
efficiency, exhaust control of CO2, reduction
of noise, cross-wind stability are subjects
imposed on recent vehicles. Thus the drag
reduction is sought by use of shape
optimizations and aerodynamic flow devices.
ます。 Effects of Aerodynamic-Flow Devices
Spats
Strakes
Deflectors
• Each device has the effect to
reduce drag
• Combination of appropriate
strakes and deflectors
decreased CD best
Originality
Because flows about vehicles depend not only on
upper-surface flows but also on flows between the
lower surface and the ground, their interference are
simulated with the moving belt in the wind-tunnel
experiments. Investigation of the critical flows
about a circular cylinder and numerical simulations
are also carried out, flow phenomena are
synthetically comprehended, and the reduction of
drag and noise are sought.
Circular Cylinder Flows with Simultaneous Multipoint Pressure
Measurements: Characteristics of Critical Flows
Circular Cylinder Model Pressure Drag Coef.
Time History of Pressure Lift Coef.
Test Section in WT
Oscillation with
high frequency
U=10m/s Re=1.42×105
U=15m/s Re=2.14×105
U=20m/s
Combination of various aerodynamic devices and
optimization of their shapes can bring the drag
reduction greatly. Through the cause and factors are
pursued from aerodynamic consideration, design
toward further reduction are made possible.
Strouhal Number
Undulation with
low frequency
Amplitude: largest No Undulation
laminar separation
with vortex shedding
Amplitude:
Undulation:
becomes smaller begins to
appear
Re=2.86×105
Amplitude:
Undulation:
becomes smaller remarkable
U=25m/s Re=3.57×105: critical state
wind leans to
alternate directions
U=30m/s Re=4.29×105
Amplitude:
No Undulation:
becomes smaller
Yonemitsu, R., Takakura, Y., and Takagi, M., “Improvements of Aerodynamic
Characteristics in Notchback Cars by Rear Spoilers,” Proc. Schl. Eng. Tokai
Univ., Vol. 50, No. 2, (2010), pp.123-130.
Takakura, Y., Watanabe, S., and Takagi, M., “Unsteady Flows around a Circular
Cylinder with Simultaneous Multipoint Measurements of Pressure,” Proceedings
of 11th Asian Symposium on Visualization, Niigata, Japan, (2011), ASV11-99-68.
◆Contact e-mail： takakura at tokai-u.jp
※ at = ＠
Architecture
and
Civil Engineering
Structural Engineering
Coastal protection and mitigation against natural disasters,
wave power generations, and disposal methods of beach wreckage
Topics: tsunami disasters, wave damage,
damage prediction, pressure elements,
wave power generation, beach wreckage
Principal investigator: Yoshimichi Yamamoto (professor)
Many coasts in Japan have suffered damage by big
waves every year and by tsunami every decade. If their
damage can be estimated beforehand, we can take
countermeasures in order to prevent or mitigate their
damage.
Because the securing of safe self-supplied energy is
very important, I started the research of wave power
generation which makes this possible.
Because a lot of wreckage and waste are drifting
ashore to many coasts, I continue the research of
inexpensive disposal methods of such beach wreckage.
A sample of relation between inundation depths and
threshold widths of a reinforced concrete pillar. (White circles
are non-destructive cases, black circles are destructive cases. The Pillar
height is 3m, the pillar interval is 5m. Double reinforcement section,
Ratio of reinforcement section area to total section area is 0.0365.)
Originality
Water depth change (m)
-2.0
-1.0 Height(m)
0.0 1.0
- 2 - 1 .5 - 1 - 0 .5 0 0 .5 1
I proposed a method to handily evaluate the
building damage of wide areas due to tsunami by
considering main member sizes, methods which
predict the inundation and the topographical change
due to tsunami by light calculation load, and a method
of predicting the suck-out destruction of dykes and
seawalls by big waves. As for the wave power
generation, I am proceeding with research which uses
pressure elements. As for the beach wreckage, I
developed cheap foul odor control methods of the
beach litter, and am proceeding with the development
of road blocks built of this waste material.
1 .5
何もし
650
2.0
2
Uncontrolled
ない
酵素
600
Enzyme
550
-15ｍ
-３ｍ
-１ｍ
０ｍ
１ｍ
５ｍ
3000倍
450
2000 times
400
臭
気 350
の
強 300
さ
250
3000 times
-５ｍ
Odor strength
-10ｍ
1000倍
1000 times
500
5000倍
ＥＭ菌
Effective MO
1000倍
1000 times
3000倍
2000 times
200
5000倍
150
3000 times
100
Sell powder
末
50
1000 times
貝殻粉
1000倍
3000倍
0
14
14日後
8日後
5日後
3 5
8
(day)
3日後
1
1日後
３ｍ
０時
0
2000 times
5000倍
3000 times
NN
The new building damage appraisal method and the
new inundation simulation method enable tsunami
damage prediction with high accuracy under a moderate
work burden. Heavy erosion and scour arose on many
coasts in a lot of past big tsunamis. The new methods of
predicting topographical change are effective in
evaluating such erosion and scour. The new method of
distinguishing the suck-out destruction by big waves is
also useful in examining disaster prevention plans.
Wave power generation is important as a safe
energy supporting method, and inexpensive disposal
methods are also important to keep beautiful coasts.
Odor elimination by spraying the
diluted solution of enzymes, effective
microorganisms, and shell powder
against the foul odor of uncontrolled
Calculated
water
depth
change
topographical change after 90minutes
90minutes after Tsunami inputting. seaweed.
0
100 200 300 400 m
Example of published papers:
1) Y. Yamamoto, H. Takanashi, S. Hettiarachchi, S. Samarawickrama: Verification of the
destruction mechanism of structures in Sri Lanka and Thailand due to the Indian Ocean tsunami,
Coastal Engineering Journal, Vol.48-2, pp.117-145, 2006.
2) Y. Yamamoto・K. Nariyoshi・Vu Thanh Ca: Improvement of Prediction Methods of Coastal
Scour and Erosion due to Tsunami Back-flow, Journal of Japan Society of Civil Engineers,
Vol.B2-65, No.1, pp.511-515, 2009. (in Japanese)
3) Y. Yamamoto・K. Nariyoshi・R. Higa: Damage Limitation of A Coastal Dike and A Seawall,
Journal of Japan Society of Civil Engineers, Vol.B3, be scheduled for publication, 2011.
◆Contact e-mail：yo-yamamo at tokai-u.jp
※at = ＠
Non-linear Dynamic Response Analysis of Bridge crossing Earthquake Fault
Rupture Plane
Derivation of the Equation of Motion considering Inertial Force and Relative Displacements
Topics：Equation of Motion, Non-linear Dynamic Analysis, Fault Movements
Assoc. Prof. Tomohiro Nakano
The effect of acceleration is of great importance
for evaluating the damage of structures caused by
earthquake faults.
On condition that fault displacement affects the
bridge, we formulated the equation of motion for
bridge structure under inertial force and the relative
displacements of support points of the bridge and
developed a special algorithm to solve this
equation.
Originality
The numerical simulation method above
mentioned for bridges, subjected to both inertial
force and relative displacements of support points,
can predict seismic performance and damage level
of bridges under fault displacements.
According to analytical results, we can conclude
that the effect of inertial force will influence the
damage level of an bridges enormously; hence we
have to consider not only relative displacement but
also the consequence of a fault-generated
acceleration.
Non-linear Dynamic Response Analysis of Bridge crossing
Earthquake Fault Rupture Plane, T.Nakano and Y.Ohta, The 14th
World Conference on Earthquake Engineering, DVD
◆Link：http://www.ev.u-tokai.ac.jp/nakano/index.htm
◆Contact e-mail：tom_nakano at tokai-u.jp
※at = ＠
Mechanism and prevention of bridge cable corrosion
Improvement of durability of inflastractures
Topics：Suspension bridge cables, Corrosion, Dehumidification
Principal investigator: Prof. Shunichi Nakamura
Cable is a key element of suspension bridges and its
breakage may lead to collapse of the whole bridge.
There are old suspension bridges in USA and many
broken wires have been found. Suspension bridges
in Japan are relatively new but cable corrosion has
been found on several suspension bridges. I have
been involved in this research project from the
initial stage and found the mechanism of corrosion
and developed a new corrosion prevention method
using dry air to dehumidify the cable inside.
Innoshima Bridge
Honsyu-Shikoku Bridge
Completed in 1983
Span Length 770m
Cable corrosion
(Black parts)
came out six
years after
completion.
Originality
As conventional corrosion prevention method is
complex, nobody had been successful in clarify the
corrosion mechanism. With installing sensors in
actual and model cables the corrosion mechanism is
estimated and confirmed. Our findings are highly
evaluated and awarded the best paper prizes by the
international and domestic academic organization.
The dehumidification system was first introduced to
the cables in the world and a purely original
technology.
Cables are used not only for suspension bridges but
also cable-stayed and Nielsen bridges. These types
of bridges also suffer from cable corrosion. The
repetitive loads acting on these bridges are larger
than suspension bridges and, therefore, fatigue
should be considered. This fatigue under corrosion
environment is now being tackled, and if it is
successfully solved, my research achievement is
more widely applied to actual structures.
Inlet and outlet
Akashi Kaikyo Bridge in Kobe
of dry air
Completed in 1988
World longest bridge with a span of 1991m
Dehumidification system was first intruded
to the cables in the world
Shunichi Nakamura, Keita Suzumura: Hydrogen embrittlement
and corrosion fatigue of bridge wires, Journal of Constructional Steel
Research, Elsevier, Vol.65, Issue 2, 269-277, 2009.2.
Keita Suzumura and Shun-ichi Nakamura: Environmental factors
affecting cable corrosion, Journal of Materials in Civil Engineering,
ASCE, Vol.16, No.1, 1-7, 2004.1.
◆Contact e-mail：snakamu at keyaki.cc.u-tokai.ac.jp
※at = ＠
Estimation of Long-Term Settlement and Secondary
Compression of Clayey Soft Ground
Topics：one-dimensional consolidation, plane strain, secondary compression
Principal investigator: Prof. Motohiro Sugiyama
An urban area has developed on the soft alluvial
ground in the low land. A prediction of deformation
and subsidence behavior of soft foundation is the
most important issue, and many estimation methods
based on one-dimensional consolidation theory
were proposed. In this study, the model which can
evaluate subsidence behavior in consideration of
secondary compression examines, and it is
proposed.
間隙比　ｅ
等間隙比速度線
e0
A点：載荷前
F点：１日後
I 点：一次圧密終了時
S点：二次圧密途中
*
Cc
A (e 0)
ei
I ( ei )
Cc
e
S ( es )
ef
F ( ef )
σ
σ0
σ
圧密圧力 ( log scale )
Volumetric strain ( % )
Originality
There are two ideas about when secondary
compression starts. However, it can’t make sure of
this phenomenon by an experiment. The secondary
compression model which supposed that secondary
compression occurred from primary consolidation
is proposed. The proposed model is expanded to
multidimensional consolidation problem, and
consolidation behavior of plane strain condition is
estimated.
0
p = 78.5 - 157.0 kPa
Calculated
Primary
consolidation
υp= 4.38
2
4
y/H= 0
6
8
t90= 20 min
Observed
1 day
H= 0.968 cm
vf = 8.77
10
10-1
100
101
Cc= 1.06
102
103
104
Time ( min )
We already suggest the secondary compression
model that can reproduce the subsidence behavior
of the laboratory test. The constants that are
necessary for this model can decide a parameter
only from one-dimensional consolidation test. The
expansion to the hyperspace is not easy, but tries it
because it is an important theme.
H. SHIRAKO, M. SUGIYAMA, A. TONOSAKI and M.AKAISHI:
Secondary Compression Behavior in Standard Consolidation Tests,
Proc. Schl. Eng. Tokai Univ., Ser. E,31 (2006), pp.27-32.
◆Contact e-mail：sugi at keyaki.cc.u-tokai.ac.jp
※at = ＠
Marine Science
and
Technology
Marine Science and Technology
Multi-parameter monitoring system for geoengineering
A new integrated monitoring approach
Topics：Geomechanics, Geoengineering
Principal investigator: Prof. Ömer Aydan ①
Collaborator: Prof. Hisataka Tano ②
Collaborator: Assoc. Prof. Naohiko Tokashiki ③
①
②
③
The stability problems in geoengineering are
sometimes encountered and they may result in
casualties as well as economic losses. When rock
starts to fail, the stored mechanical energy in rock
tends to transform itself into different forms of
energy. Therefore, monitoring of variations of
multi-parameters (i.e. electrical potential, resistivity,
magnetic field, heat release) in addition to common
parameters may be used for the assessment of the
stability of geoengineering structures.
Originality
A real time multi-parameter monitoring system
developed involve electric potential (EP) variations,
acoustic emissions (AE), rock temperature (RT),
temperature and humidity of the structures in
addition to the measurements of displacements and
loads on support members. It incorporates four
fundamental elements of integrated geoengineering
monitoring such as 1) monitoring techniques 2)
theory-analysis; 3) Experiments and investigations
and 4) experiences and interpretation methods.
Applications of the system to real geoengineering structures
The multi-parameter integrated monitoring
system developed in this research is expected to be
usefull for engineers in geoengineering applications
such in assessing long-term performance of
geoengineering structures, severe stability problems
in deep high-level waste disposal projects,
underground caverns and tunnels, high slope cuts,
and mountains. It may be also usefull for scientists
involved with predicting natural disasters such as
earthquakes and volcanic eruptions.
Ö. Aydan, M.,Daido, H. Tano, N. Tokashiki, K. Ohkubo. A real-time
multi-parameter monitoring system for assessing the stability of tunnels during
excavation. ITA Conference, Istanbul, 2005, 1253-1259
Ö. Aydan, N.Tokashiki, T. Ito, T. Akagi, R Ulusay, A. Bilgin. An experimental
study on the electrical potential of non-piezoelectric geomaterials during
fracturing and sliding. 9th ISRM Congress, South Africa, 2003, 73-78
◆Contact e-mai：[email protected]