reinforced with aluminum borate whiskers was estimated · reinforced with aluminum borate whiskers...
TRANSCRIPT
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��� ANALYSIS OF FINE STRESS FIELDS IN
METAL MATRIX COMPOSITES USING HOLZ
PATTERNS�
����� )M. Shibata, Y. Takemoto and I. Shimizu�
��� � THRERMEC’2006, INTERNATIONAL
CONFERENCE on PROCESSING &
MANUFACTURING OF ADVANCED
MATERIALS��
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The thermal strain of aluminum alloy composites
reinforced with aluminum borate whiskers was estimated
using HOLZ pattern analysis. Each (001) plane in the
aluminum borate whiskers was rotated towards the [020]
direction by up to 0.5©. With a unit of nearly 400 nm ×
400 nm, each (100) plane was rotated towards the [020]
direction in a corkscrew pattern. In addition the strain
and the stress caused during the fabrication of the
composites were estimated by using the finite element
methods taking into account the anisotropies in both the
CTE and the elastic modulus of the reinforcement
material.
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��( Delayed Fracture Properties of Aluminum
Bearing Ultra High Strength Low Alloy TRIP-aided
Steels
����( )Tomohiko HOJO, Koh-ichi SUGIMOTO,
Youichi MUKAI and Shushi IKEDA
����( Proceedings of The 3rd International
( Conference on Advanced Structural Steels
pp. 916-921
� ���( 899:;�=88þ8�.
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The hydrogen absorption behavior and delayed
fracture properties of aluminum bearing ultra
high-strength low alloy TRIP-aided steels with bainitic
ferrite matrix, “TBF steel”, were investigated. When
aluminum of 0.2-1.0 mass% was added, delayed fracture
strength of the TBF steels was significantly increased.
This was caused by the existence of refined and
stabilized interlath retained austenite films which
trapped most of charged hydrogen, as well as lath
boundary and on highly distributed dislocations in the
matrix. Furthermore, it was expected that these retained
austenite films play a role of lowering the local stress
concentration by plastic relaxation due to the strain
induced transformation of retained austenite, not the
stress-induced transformation on loading.
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��( Case study on combination of fluorescent
materials for white LED to obtain high color
rendering indexes( ( ( ( ( (
���( Shunsuke Nayama and Kunio Itoh
���( Journal of Light & Visual Environment(
( ( ( ( ( ïkld<9T(�kd¿( ( ýýd<<þ�8
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( We realized the white LED whose average Color
Rendering Index is as high as 94.2 by applying the
commercial Red, Yellow, Green and Blue phosphors to
near ultraviolet-LED. So far as we know, this value is
the highest ever attained in white LED around the color
temperature of 5500K. In order to realize the good
Ra(average CRI), we made a CRI simulator and
simulated the spectrum distribution of white LED with
good Ra. The spectrum distribution obtained by this
simulator was proved to be very useful as a landmark for
realizing a prototype white LED with good Ra.
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��( Study on Combination of Fluorecsent Materials
for White LED to obtain High Color Rendering
Indexes
����( )Saburo Mitsuyoshi and Kunio Itoh
��( 2005 Kosen Convention I.E.E. Japan
Record pp.37-38
� ���( 899: ; < = ¿9 .
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( The purpose of this study is to advance color
rendering indexes of white LED by using UV-LED and
commercial Red, Green, Blue and Yellow phosphors.
The target value is Ra=95 for the color temperatures
5000~6500K, which are based on AAA CRI evaluation
of fluorescent lamp. First, the CRI was calculated by
using the simulator which we developed. The simulation
result showed that Ra=96.1 was possible by using the
commercially available phosphors.As a result, we got the
highest value of Ra=95.2 with the chromatic value of
(x,y)=(0.31,0.34)(6250K). The spectra shape of
experimental result and simulation result were almost the
same.
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��( Study on Characteristics of Electrode-less Lamp
����� )Satoshi Nimata( Tadao Uetsuki
��( Light Source Workshop Ehime University,
Wonkwang University
� ���( 13th( September 2005
���
It is considered important to grasp the relationship of
The characteristics of the electrode-less lamp's plasma,
namely the induced coupling plasma, to the operating
frequency. This paper reports the relationship of the
plasma characteristics of two electrode-less lamp to the
operating frequency as the followings. (1) Ignition at 150
kHz is harder than at 13.56 Mhz. (2) Electron
temperature (Te) at 150 kHz is lower than at 13.56 MHz.
(3) Electron density distribution (Ne) of the 150 kHz
plasma is different from that of 13.56 MHz. (4) Ne
measured at the one point of the electrode-less lamp
�����������
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operated seems not vary if the operating frequency
changes. (5) Efficacy (illumination per wattage) at 150
kHz seems lower than at 13.56 MHz
��( The Investigation of the CCFL's cathode fall
voltage characteristics
����( )Yuji Takeda&Ryota Kitamoto&Tadao
Uetsuki&Osamu Fukumasa�
��( Light Source Workshop Ehime University,
Wonkwang University
� ���( 13th( September 2005
���
The cathode fall voltage (Vc) of a Cold Cathode
Fluorescent Lamp(CCFL) was measured by our invented
measurement method. Then the relevance of the Vc
measurement method was investigated by observing the
negative glow appearance. As a result, it is recognized
that the area of negative glow covers the electrode
surface is varied with the electrode materials even if
same lamp current, and that the variation of the negative
glow area on the electrode affects the fluctuation of the
Vc when the lamp current is changed.
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Almost fifteen years have been passed since the
electrode-less lamp was put on the market. Some kinds
of the electrode-less lamps have been developed from
some companies. The trends in the development are to
get the higher lumen output and to operate this lamp at
lower frequency. In this situation it is considered very
important to grasp the relationship of the characteristics
of the electrode-less lamp's plasma to the operating
frequency. This paper reports on the difference of the
plasma characteristics of two electrode-less lamps,
which are operated at 13.56MHz and at 150kHz.
��( MÊ�Ù& 345�é�fb"À�$½¾
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� � ( A STUDY ON THE RELATIONSHIP
BETWEEN ELECTRODE MATERIALS
AND CHARACTERISTICS OF CCFL'S
NEGATIVE GLOW PLASMA
����( )Tadao Uetsuki and Ryota Kitamoto
� � � Tsuyama Nat. Coll. of Tech., 624-1
Tsuyam,Okayama Jpn
Yuji Takeda
Harison Toshiba Lighting Corp.,5-2-1,Asahimachi
Imabari,
Ehime, Jpn
Osamu Fukumasa
Yamaguchi Univ., 2-16-1 Tokiwadai, Ube, Yamaguchi,
Jpn
��( ICOPS 2006, Traverscity, USA
� ���( 4th-8th( June, 2006
��
CCFLs (Cold Cathode Fluorescent Lamps) generally
used for the backlight of the LC-TV and the note-PC are
always expected the improvement of the electrode to
make more lamp current flow for getting higher
luminance. To improve the electrode to get the higher
luminance, it is very important to grasp the electron
emission ability of the cathode. Authors have considered
that the electron emission ability determined by the
nature of the material could be evaluated by the cathode
fall voltage (CFV), and that CFV has the intimate
relationship to the performance of negative glow's
(NG's) plasma. 2 kinds of electrode materials, namely Ni
and Mo, were used for this research. Though the
common electrode of CCFL is hollow cathode, the
electrode used here were in
the shape of the plate, whish had a length of 5.2mm, a
width of 1.7mm and a thickness of 0.1mm. This is
� � � � � � ���� ������
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because it is necessary to observe the NG's plasma for
grasping the basic relationship between CFV and the
performance of NG's plasma. The lamp diameter was
4mm and had Ne (8kPa) and Hg vapor. First, the
relationship between a state of NG's plasma and
discharge current was observed for each kind of
electrode materials. The area of NG's plasma increased
to whole area of the electrode as the discharge current
increased. However the way to increase depended on the
electrode materials. Secondly, the relationship of the
CFV to the discharge current was measured. The method
to measure the CFV was developed by improving the
method for measuring the CFV of the fluorescent lamp1.
The CFV of Ni was higher than that of Mo. The ways of
the change of the CFVs were similar in the following
respect. That is to say, CFVs were constant until some
discharge current, then increased as the discharge current
increased. While, the increasing rates of CFVs were
different from each other. Authors consider that the
difference of gamma-coefficient causes the difference of
CFV's increasing rate.
1. T. Uetsuki and YuyaTerao, "Study on the
relationship of the emission performance of the
fluorescent lamp to the lighting time", 5th Lux Pacifica,
July 24-26, 2005, pp.29-32.
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����( )T. Yuji, T. Hamada, T. Bouno and
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Engineering (Hanyang University, Ansan
Korea) pp.284-287.
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Development of a fault diagnosis system for wind
turbines is necessary, the system of wind-generated
power has contributed to become outdated. There have
been many cases of damages to the blades of wind
turbines and to the internal areas of the generator due to
flying objects and lightning. Using a small wind turbine,
we researched electric or mechanical signals that go off
when the blade or the inside of the generator becomes
damaged. We searched for indicator that would trigger
the fault diagnosis to start with a shock sensor, from
which there was a prominent change in the signal output
on damaging a 40mm area of the blade. A wave analysis
of the output signal was also conducted by Fast Fourier
Transform (FFT) analysis and similar results were
obtained.
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� � � Autonomous Role Assignment in a
Homogeneous Multi-Robot System
���� Toshiyuki Yasuda and Kazuhiro Ohkura(
��� Journal of Robotics and Mechatronics
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( This paper describes an approach for controlling an
Autonomous homogeneous multi-robot system. An
extremely important topic for this type of system is the
design of an on-line autonomous behavior acquisition
mechanism that is capable of developing cooperative
roles as well as assigning them to a robot appropriately
in a noisy embedded environment. Our approach applies
reinforcement learning that adopts the Bayesian
discrimination method for segmenting continuous state
and action spaces simultaneously. In addition, a neural
network is provided for predicting the average of the
other robots' postures at the next time step in order to
stabilize the learning environment. The proposed method
is validated through computer simulations as well as our
hand-made multi-robot system.
(
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��� A homogeneous mobile robot team that is
fault-tolerant
���� Toshiyuki Yasuda, Kazuhiro Ohkura, and
Kanji Ueda
���� Advanced Engineering Informatics(
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This paper introduces a design methodology of a
fault-tolerant autonomous multi-robot system (MRS). An
important fundamental topic for this type of system is
the design of an on-line autonomous behavior
acquisition mechanism that is capable of developing
cooperative roles as well as assigning them to a robot
appropriately in an embedded environment. Our
approach is to apply reinforcement learning that adopts
the Bayesian discrimination method for segmenting
continuous state and action space simultaneously. In
addition, a neural network is provided for predicting the
average of the other robots’ postures at the next time step
in order to stabilize the learning environment. Computer
simulations are conducted to illustrate the fault-tolerance
of our MRS against a system change that occurs after the
MRS achieves stable behavior.
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learning called BRL. BRL has( a unique feature that it
not only learns in the learning space but also( changes
the segmentation of the learning space simultaneously.
In this( paper, a new function for segmenting its action
space based on parameters( of acquired rules is adopted
to BRL in order to accelerate learning. We( verify the
performance of the proposed approach through computer(
simulations and physical experiments.
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exoskeleton cyborg system
���( T. Onishi, T. Arai, K. Inoue and Y. Mae(
�� �� http://dx.doi.org/10.1007/BF02481155(
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DOI10.1007/BF02481155 Pages95-101(((
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The human internal skeleton is referred to as an
endoskeleton, while oyster shells and the cuticles of
lobsters and crabs are referred to as exoskeletons. A
great deal of research has been conducted in an attempt
to combine these endoskeletons and exoskeletons.
However , there are hardly any instances of research
being undertaken to create a cyborg by combining
endoskeletons and exoskeletons. The human
endoskeleton consists of three kinematic pairs that are
joined together with a maximum of three degrees of
kinematic freedom. These are :
1. A turning pair on a lateral-bending axis
2. A turning pair on a longitudinal-bending axis
3. A turning pair on the central axis of a skeleton
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This presentation demonstrated the use of an “EFL
Portfolio” for large college English classes in Japan
(EFL=English as a Foreign Language). The portfolio
contains assessment forms and other organizational tools
that help manage day to day coursework. For example,
each time students have a discussion, they fill in the
“Discussion Evaluation” form in the portfolio. Likewise,
when they give a presentation, they fill in a “Presentation
Self-Evaluation” form. Periodically during the course the
instructor collects and reads the portfolios, and at the end
of the course assigns the portfolio a grade.
This approach encourages students to think about their
learning process and complete their work. Moreover, it
allows the instructor to see a broad range of work from
each student and provide individualized instruction. This
portfolio approach is effective in achieving specific
course goals.
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