特集-シミュレーション- Rev. High Pressure Sci. Technol. 8-4,243-250(1998) |
超臨界流体+高沸点化合物系のモンテカルロシミュレーション Monte Carlo Simulation for Supercritical Fluids + High-Boiling Compounds Systems |
山本盛夫 岩井芳夫 YAMAMOTO Morio IWAI Yoshio |
The Monte Carlo method has been applied to
calculate the solubilities (gas-solid
equilibria)
of high-boiling compounds (aromatic
compounds,
higher alcohols, and higher fatty acids)
in supercritical fluids. Supercritical
fluids
were treated as single site molecules,
and
high-boiling compounds were treated
as multisite
molecules. The solubilities of aromatic
isomers
in supercritical carbon dioxide can
be quantitatively
distinguished by a group contribution
site
model without any binary interaction
parameters.
The structures of supercritical carbon
dioxide
around aromatic isomers are found to
be different
because of the screen effect of the
substituents.
The radial distribution functions of
supercritical
fluids and mean-square end-to-end separations
for chain molecules have been reported
as
fundamental knowledge of the microstructure
of chain molecules in the supercritical
fluid
phase. [Monte Carlo Simulation, Supercritical Fluid, Solubility, High-boiling Compound, Radial Distribution Function] |
〒812-8581 福岡市東区箱崎6-10-1 九州大学大学院工学研究科化学システム工学専攻 Department of Chemical Systems and Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan |
特集-シミュレーション- Rev. High Pressure Sci. Technol. 8-4,251-259(1998) |
流体と固体の衝撃シミュレーション Numerical Simulations of Shocks in Fluids and Solids |
片山 雅英 KATAYAMA Masahide |
After an overview of the formulation of hydrocodes
applied to the numerical simulation
of the
shock and pressure waves in solid,
liquid
and gas phases of materials, several
examples
of hypervelocity impact and explosion
analyses
are shown and discussed partly as compared
with corresponding experimental results. [hydrocode, Eulerian, Lagrangian, explicit solution scheme, smoothed particle hydrodynamics, hypervelocity impact, detonation, space debris] |
〒136-8581 東京都江東区南砂2-7-5 (株)CRC総合研究所 CRC Research Institute, Inc., 2-7-5 Minamisuna, Koto-ku, Tokyo 136-8581 |
特集-シミュレーション- Rev. High Pressure Sci. Technol. 8-4,260-267(1998) |
粉体成形プロセスのシミュレーション Simulation of Powder Behaviour during Compaction based on Continuum and Discrete Modelling |
島 進 小寺 秀俊 SHIMA Susumu KOTERA Hidetoshi |
In powder forming processes, the behaviour
of powders during compaction, such
as the
mechanisms of density increase, density
distribution,
evolution of anisotropy, the shape
of compacts
in isostatic compaction, etc. significantly
influence the quality of the products,
dimensional
and geometrical accuracy and material
consumption.
Further, the compacts that have been
compacted
at room temperature are subject to
a sintering
process; they undergo dimensional and
geometrical
change during the process; these are
affected
by the previous compaction process
and density
distribution. In recent years, the
demand
has been increasing for accuracy in
the dimensions
and shapes of products. Simulation
of compaction
behaviour of powders is, thus, of great
importance
for near net shape production. To simulate
the behaviours of powders or granular
materials,
there are two approaches: one is to
treat
the powder based on continuum mechanics,
and the other is to observe the movement
of individual particles. In this article,
we shall overview the state of the
art regarding
both types of simulation. [simulation, FEM, discrete modelling, powder compaction, isostatic pressing, die pressing, constitutive equations] |
〒606-8501 京都市左京区吉田本町 京都大学大学院工学研究科機械工学専攻 Department of Mechanical Engineering, Kyoto University Sakyo-ku, Kyoto, 606-8501, Japan |
特集−シミュレーション− Rev. High Pressure Sci. Technol. 8-4,268-272(1998) |
BCNヘテロダイヤモンドの理論設計 Theoretical Design of BCN Heterodiamond |
常行 真司 館山 佳尚 TSUNEYUKI, Shinji TATEYAMA, Yoshitaka |
A computational-physics approach to design
and prediction of hypothetical BCN heterodiamonds
is reviewed. A probable heterodiamond BC2N structure that can be obtained from the
compression of graphitic BC2N at low temperature is proposed using first-principles
calculations. The structure, which has a
large bulk modulus comparable to that of
diamond as well as a wide band gap, can also
be synthesized from a superlattice of graphite
and hexagonal BN monolayers, suggesting that
we could design a variety of polytypes. [diamond, high-pressure synthesis, computer-aided design, structural transformation, electronic structure] |
〒106-8666 港区六本木7-22-1 東京大学物性研究所 Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106-8666 (平成10年4月より科学技術庁金属材料技術研究所) |
特集−シミュレーション− Rev. High Pressure Sci. Technol. 8-4,273-279(1998) |
ベルト型超高圧発生容器内部の応力解析 Estimation of Stress Distribution of Pressure Media in a Flat Belt Type High Pressure Apparatus by the Rigid Plastic Method |
佐藤 周一 中島 猛 中村 裕一* SATOH Shuichi NAKAJIMA Takeru NAKAMURA Yuichi |
A stress distribution of pressure media in
the high pressure apparatus, flat belt type,
was estimated by rigid plastic method. Since
it was so difficult to estimate the stress
distribution of that primarily, because of
complicated inner structure of the pressure
media, we tried to estimate stress distribution
in diamond anvil cell that had a simple structure.
Various kinds of pressure media , copper,
pyrophyllite and salt , were used to study
the effect of friction factors. The estimated
stress distribution of copper in a diamond
anvil cell was quite similar to the observed
one, when thefriction factor was supposed
to be a constant at any inner pressure. On
the other hand, the estimated stress distribution
of pyrophyllite became equal to the observed
one, when thefriction factor was supposed
to be proportional to the 3rd power of an inner pressure. Finally, the estimated stress distribution of pressure media in the high pressure apparatus could be equal to the observed one using supposition of the friction factor being proportional to the 3rd power of an inner pressure. [high pressure apparatus, rigid plastic method, finite element method, pressure media, friction factor] |
〒664-0016兵庫県伊丹市昆陽北1-1-1 住友電気工業株式会社
伊丹研究所 Itami Research Laboratories, Sumitomo Electric Industries LTD, 1-1-1,koyakita,Itami, Hyogo, 664-0016 *〒514-8507 津市上浜町 1515 三重大学工学部 物理工学科 ナノプロセッシング Faculty of Engineering, MIE University, 1515, Kamihama-cho ,Tsu, Mie, 514-8507 |
トピックス Rev. High Pressure Sci. Technol. 8-4,280-286(1998) |
リウムガス媒体による高圧下単結晶X線構造解析 ―混合原子価錯体 Cs2AuIAuIIIX6 の結晶構造― Single Crystal X-Ray Structure Analysis under High Pressure Using He Gas as a Pressure Transmitting Medium ― Crystal Structure of Mixed-Valence Complexes Cs2AuIAuIIIX6 ― |
松下信之 MATSUSHITA Nobuyuki |
In this report, a technique of single crystal
X-ray diffraction measurements under high
pressures, using a diamond-anvil-cell with
helium gas as an inert and hydrostatic pressure-transmitting
medium, is introduced. The technique has
been applied to three-dimensional halogen-bridged
mixed-valence gold complexes, Cs2AuIAuIIIX6 (X=Cl, I) to investigate the mixed-valence
state and the crystal structure under high
pressures up to 18 GPa and 7.5 GPa, respectively.
The pressure dependences of the unit cell
parameters indicate that structural phase
transitions occur from tetragonal to cubic
at 12.5 GPa for the Cl-bridged complex, and
from tetragonal to monoclinic at 6.0 GPa
for the I-bridged complex. The Cl-bridged
complex in the higher pressure phase has
a space group, Pm3m and the cubic Perovskite-type structure.
[DAC, high pressure, helium gas pressure-transmitting medium, single crystal, X-ray diffraction, mixed valence, gold complexes, Perovskite structure, phase transition] |
〒153-8902 東京都目黒区駒場3-8-1 東京大学大学院総合文化研究科広域科学専攻相関基礎科学系・化学 Department of Chemistry, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, 3-8-1, Meguro, Tokyo 153-8902 |
トピックス Rev. High Pressure Sci. Technol. 8-4,287-293(1998) |
溶液中における一重項酸素の寿命と反応性―
高圧力効果からのアプローチ Lifetime and Reactivity of Singlet Oxygen in Solution - Approach from High Pressure Study |
岡本政實 OKAMOTO Masami |
Singlet oxygen, 1O2(1△g), which is the lowest electronically
excited state of the oxygen molecule, is
quenched by various compounds. In this article,
the pressure effects on the physical quenching
of 1O2(1△g) by solvent molecules and amines, and
also on the chemical reactions of 1O2(1△g) with furans and tetramethylethylene
(TME) (ene reaction) in liquid solution are
reviewed. For these systems, the quenching
mechanism is described. [singlet oxygen(1△g), high pressure, bleaching of DPBF, luminescence, physical quenching, chemical reaction] |
〒606-8585 京都市左京区松ケ崎橋上町 京都工芸繊維大学工芸学部 Faculty of Engineering and Design, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585 |
解説 Rev. High Pressure Sci. Technol. 8-4,294-301(1998) |
高圧力下の微生物活性 −圧力ショック酵母の熱測定とレーザーの生体刺激効果− Microbial Activities under High Pressure: Calorimetry of Pressure-Shocked Yeast and Biostimulation Effect of Laser Irradiation |
田村勝弘 宮下充雄 TAMURA Katsuhiro MIYASHITA Mitsuo |
Biocalorimetry is one of powerful and convenient
tools to evaluate microbial activities under
high pressure. The method is mainly based
on the fact that the heat evolved is strictly
proportional to the metabolic activity, and
the magnitude of calorimetric signal is employed
as an index to express the biological activities.
This method was adopted in order to investigate
the thermotolerance of heat- and pressure-shocked
yeast. The effects of the non-reducing disaccharide
trehalose on the stress response of yeast
were also studied by colony counting method
and calorimetry. Biostimulation effect of
He-Ne laser was used for the recovery of
yeast activity under high pressure up to
100MPa. At50MPa and 30℃, the growth of unirradiated
yeats was inhibited entirely, however, the
viable cell numbers of irradiated ones were
increased and the rate of the increase in
number of viable cells corresponded to that
of the inrradiated ones at 0.1MPa. [calorimetry, yeast, pressure shock, laser, thermotolerance, trehalose, microbial activity, heat shock] |
〒770-8506 徳島市南常三島町 2-1 徳島大学工学部化学応用工学科 Department of Chemical Science and Technology, Faculty of Engineering, The University of Tokushima, Minamijosanjima-cho, Tokushima 770-8506 |
論文 Rev. High Pressure Sci. Technol. 8-4,302-305(1998) |
Dynamic strength of spherical shells under internal explosive loading |
A. G. Ivanov, M. A. Syrunin, A. G. Fedorenko |
The paper presents the results of experiments
for determination of response of spherical
shells having load-bearing layer from fiber
glass under radially symmetrical inner explosive
loading. We carried out assessment of dynamic
strength of two shell types with diameter
of 500 mm, which differed in the scheme of
fiber glass layer coiling. It was demonstrated
that a shell with more even theikness (of
15-20 mm)of load-bearing fiber glass layer
has significant advantage. Such a sheath
has approximately twofold reserve of strength
during explosion of a charge equal in energy
to 1.4 kg of trinitrotoluene in its geometrical
center. It has been found that transition
from one-axial strains, which are reallized
under explosive loading of a cylindrical
shell, to two-axial strains, when spherical
shells are used, does not change the value
of limiting strains of fiber glass(on the
destruction threshold). This value is determined
by limiting strains of a glass thread. It
is equal to 4-5 %. Tested spherical shells
from fiber glass reinforced by steel layer
allow to obtain record high value of the
explosion-proofness property, i, e. relation
between the high-explosive charge mass, where
explosion of this high-explosive charge is
confined inside of the sheath caviity, and
mass of this shell. It is equal to 3-6 %. [shell, fiber glass, explosive loading, strain, deformation, strength, container] |
All-Russian Scientific Research Institute of Experimental Physics, 607190, Sarov, Nizhni Novgorod region, Russia |
論文 Rev. High Pressure Sci. Technol. 8-4,306-308(1998) |
Superdense State of Metals Compressed by
Shock Waves |
R. F. Trunin |
The paper presents explosive devices designs
for generation of strong shock waves. Record
values of specific internal energy of shock-compressed
iron are obtained with use of them. [compression, shock waves, energy, pressures, iron] |
RFNC-VNIEF. Sarov. Russia |
〒606-0805
京都市左京区下鴨森本町 15 (財)生産開発科学研究所内
日本高圧力学会事務局
Tel (075)721-0376 Fax (075)723-9629
koatsu@mbox.kyoto-inet.or.jp