JaLCDOI 10.18926/15440
フルテキストURL Mem_Fac_Eng_OU_28_1_71.pdf
著者 西垣 誠| Sudinda Teddy| Hishiya Tomoyuki| 河野 伊一郎|
抄録 In this paper, method of Eulerian Lagrangian numerical analysis is used to described Advection-Dispersion phenomena. The influence of concentration to the density of fluid is considered. A laboratory model of a two dimensional confined aquifer containing an isotropic, homogeneous porous medium (Hosokawa et.al 1989) was used to validate the applicability of Advection-Dispersion of numerical analysis with steady and unsteady state condition [1].
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-11-30
28巻
1号
開始ページ 71
終了ページ 85
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307975
JaLCDOI 10.18926/15441
フルテキストURL Mem_Fac_Eng_OU_26_2_93.pdf
著者 福山 淳| Kasai Takashi| 古谷 洋一郎|
抄録 A one-dimensional tokamak transport code (TASK/TR) has been developed to analyze the evolution of a burning plasma accompanied with fusion reaction. This code deals with the electrons, deuterons, tritons, thermalized α particles, fast α particles and beam ions, separately, in order to describe the dependence of the reaction rate on the ion mixture ratio. As an energy transport model, the drift wave turbulence mode is employed. The heating and current drive by the neutral beam injection as well as the pellet injection for fuelling are also included. This code is applied to a reactor-grade plasma aimed at in the ITER project. The cases of an ignited plasma and a current-driven plasma are examined. The required power for full current drive is estimated. The effect of pellet injection, both fuel and impurity ions, is also studied.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 93
終了ページ 109
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307699
JaLCDOI 10.18926/15442
フルテキストURL Mem_Fac_Eng_OU_28_1_87.pdf
著者 Motojima Isao| 河野 伊一郎| 西垣 誠|
抄録 In recent years, construction or planning of large-scale underground structures, such as underground power plants, underground oil storage plants and nuclear power plants have been coming into consideration in Japan. To construct such as large-scale underground structures, one of the most important problems is to make clear beforehand the behavior of groundwater around these structures and the other is to carry out proper countermeasure of groundwater, so that these structures can be constructed safely and maintained stability over a long time period. This report describes the results of theoretical studies on the drain systems and at the same time, discusses the drain systems around the underground cavern for the practical underground power stations.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-11-30
28巻
1号
開始ページ 87
終了ページ 128
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307220
JaLCDOI 10.18926/15443
フルテキストURL Mem_Fac_Eng_OU_26_2_111.pdf
著者 奈良 重俊| Banzhaf Wolfgag|
抄録 An information processing task which generates combinatorial explosion and program complexity when it is treated by a serial algorithm is investigated using both Genetic Algorithms (GA) and a neural network model (NN). The task in question is to find a target memory from a set of stored entries in the form of "attractors" in a high dimensional state space. The representation of entries in the memory is distributed ("an auto associative neural network" in this paper), and the problem is to find an attractor under a given access information where the uniqueness or even existence of a solution is not always guaranteed ( an ill-posed problem ). The GA is used as an algorithm for generating a search orbit to search effectively for a state which satisfies the access condition and belongs to the target attractor basin in state space. The NN is used to retrieve the corresponding entry from the network. The results of our computer simulation indicate that the present method is superior to a search method which uses random walk in state space. Our technique may prove useful in the realization of flexible and adaptive information processing, since pattern search in high dimensional state spaces is common in various kinds of parallel information processing.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 111
終了ページ 128
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307718
JaLCDOI 10.18926/15444
フルテキストURL Mem_Fac_Eng_OU_26_2_129.pdf
著者 東辻 浩夫|
抄録 The spectrum of Schottky noise in ion storage rings is analyzed as density fluctuations in effectively one-dimensional plasmas. Strong coupling effects in these plasmas are discussed in relation to experimental observations.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 129
終了ページ 138
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307668
JaLCDOI 10.18926/15445
フルテキストURL Mem_Fac_Eng_OU_26_2_139.pdf
著者 廣瀬 壮一|
抄録 Scattering problems by a penny-shaped crack are solved using a time-domain boundary integral equation method, The crack is located in an infinite homogeneous, isotropic, linearly elastic solid, and is subjected to an oblique incident wave of either P-, SV-, or SH-wave, The hypersingular integral equation is solved to obtain near-field solutions as well as scattered far-fields. The accuracy of the present method is confirmed by comparing the near-field solutions for different arrangement of elements, Scattered far-fields are calculated for various incident waves, and their usefulness in quantitative non-destructive evaluation is discussed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 139
終了ページ 150
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307492
JaLCDOI 10.18926/15446
フルテキストURL Mem_Fac_Eng_OU_22_1.pdf
著者 岡 久雄| 山本 辰馬|
抄録 Biomechanical impedance is relatively small compared to industrial mechanical impedance. Thus it is difficult to measure it precisely. A biomechanical impedance measuring system was developed for portable use by means of random excitation. This system doesn't require a fixed body and vibrator supporting apparatus. In order to obtain an impedance spectrum, the FFT processing is performed using a personal computer. The spectra of the biomechanical impedance which is measured on body surfaces depend on body positions and can be roughly classified into three spectra patterns : soft, stiff and intermediate. During the measurement, the measuring conditions (preload, diameter of the vibrating tip etc.) influence the results. However, it became clear that the linearity of the biomechanical impedance was satisfied in the limited measuring conditions. Accordingly it is possible to standardize the impedance and to compare it with the results under different measuring conditions.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-03-31
22巻
開始ページ 1
終了ページ 14
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307480
JaLCDOI 10.18926/15447
フルテキストURL Mem_Fac_Eng_OU_28_1_129.pdf
著者 谷口 健男| 廣瀬 壮一| Ouchterlony Finn| Nakagawa Kohji| Miyaji Akihiko| Fukuoka Yasufumi|
抄録 The testing method of rock toughness is proposed by the international society of rock mechanics (ISRM), but the results may be influenced by the test pieces, and the details of the crack propagation and the stress intensity factors are not clarified through the testing. Also the experimental test requires tedious works for the preparation of test specimen and economical responsibility. The present study aims to simulate numerically the rock toughness testing which is proposed by ISRM. For this purpose, the authors propose a numerical method which can simulate the experimental testing, and they show the propriety of the proposed method by comparing the results with the experimental and other numerical methods. At the same time, they clarify the details of crack propagation behaviors in rocks, and show the change of the stress intensity factors. The proposed method is based on the displacement-type finite element method, and several techniques are introduced to obtain accurate solution of the mechanical behavior near the crack-tip area.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-11-30
28巻
1号
開始ページ 129
終了ページ 138
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307126
JaLCDOI 10.18926/15448
フルテキストURL Mem_Fac_Eng_OU_28_2_1.pdf
著者 竹元 嘉利| 榊原 精| 飛田 守孝|
抄録 Fine particles of Ti-Mo alloy have been prepared by means of arc method, and investigated on internal structure and phase transformation using HR-TEM and EDS. Martensite phase was observed in a particle containing comparatively low concentration of Mo, and ω phase was also found to exist in a nearly 14 % M0 particle. The structure of the ω phase in the fine particle is expanded and remarkably unstable in comparison with the bulk sample, so that it has disappeared in a few seconds during TEM observation. Moreover, the β structure of Ti-Mo particles has changed to the unusual fcc phase with irradiation of a strong electron beam.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 1
終了ページ 7
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307644
JaLCDOI 10.18926/15449
フルテキストURL Mem_Fac_Eng_OU_22_15.pdf
著者 古谷 洋一郎| 東辻 浩夫| Komaki Kunitaka| Tanabe Masahiro|
抄録 An effective potential of an isolated partially ionized high-Z ion, calculated within the framework of the statistical models of atoms, is injected into the one-electron Schrödinger equation, in view of evaluating the electron density and comparing it with the results of statistical models. Starting from this initial value, a self-consistent electron density is obtained on the basis of the density functional theory, where quantum natures of electrons are fully taken into account.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-03-31
22巻
開始ページ 15
終了ページ 34
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307361
JaLCDOI 10.18926/15450
フルテキストURL Mem_Fac_Eng_OU_22_35.pdf
著者 東辻 浩夫|
抄録 Several methods to derive thermodynamic sum rules for a system including charged particle are proposed and applied to charged mixtures as well as one-component systems. The validity of the statements is examined carefully with respect to the ordering in the powers of the wave number. As for the mixture of electrons and ions, it is shown how the aspect of the one-component plasma or the ionic mixture appears when electrons become strongly degenerate.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-03-31
22巻
開始ページ 35
終了ページ 44
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307661
JaLCDOI 10.18926/15451
フルテキストURL Mem_Fac_Eng_OU_22_45.pdf
著者 河野 伊一郎| 西垣 誠| 竹下 祐二|
抄録 There are two classifications of the mechanism of levee failure caused by floods; local seepage failure and progressive failure. The fundamental causes of levee failure produced by piping and erosion were studied and the safety of river leves during floods evaluated in terms of soil machanics. The critical hydraulic gradient and the process of progressive failure were obtained from one- and two- dimensional model experiments for piping and erosion. Problems inherent in and preventive measures against levee failure are discussed. In particular, effects of the Tsukinowa method, the most representative Japanese flood fighting method, were studied experimentally and improvements proposed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-03-31
22巻
開始ページ 45
終了ページ 62
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307536
JaLCDOI 10.18926/15452
フルテキストURL Mem_Fac_Eng_OU_28_2_9.pdf
著者 榊原 精| Kanadani, Teruto| Nakagawa, K.| Yokota, Y.|
抄録 The state above the solubility temperature of GP zones of Al-3mass % Mg alloy, which has a tendency for precipitation and preprecipitation at low temperature, was studied by resistivity measurement. Homogenization treatment at high temperature reduced Mg atoms in the surface layer. After quenching from 623K, the specimen was annealed sequentially at various temperatures above the GP zone solvus. The stationary resistivity obtained in annealing at a temperature was the same irrespective of the starting state and increased with decreasing annealing temperature. No precipitation was observed in the annealing. The results are not in favor of the segregation of Mg atoms to the dislocation loops but of the short range clustering.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 9
終了ページ 12
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307581
JaLCDOI 10.18926/15453
フルテキストURL Mem_Fac_Eng_OU_28_2_13.pdf
著者 Kusumoto, Hisao| 飛田 守孝| 榊原 精| Nishida, Norihide| 竹元 嘉利| 山田 益男|
抄録 The strain in Si substrate induced by locally ion-plated thin film of TiN was observed by X-ray topograph (Lang technique). Circular TiN film was deposited on one side of the Si surface. In all topographs the highest blackness attributed to kinematical diffraction effect occurred at the film edge. Rosette pattern with four-lobes was observed around the film. Blackness as a whole increased with the film thickness. Strain was observed in the depth direction of substrate by limited projection method. When the slit width was narrowed, the kinematical images disappeared, and white images appeared at the film edge. All the contrast disappeared when the TiN film was completely removed in boiling HNO(3). The strain induced by the film deposition was proved to be elastic.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 13
終了ページ 20
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307150
JaLCDOI 10.18926/15454
フルテキストURL Mem_Fac_Eng_OU_22_63.pdf
著者 Myojin Syo| Kishino Keiichi| Yamada Masahito|
抄録 The paper is a case study mode choice in interregional occupational person trips. Disagregate behavioral model of logit type is applied to the occupational person trips from Tsuyama area in Okayama Prefecture to Osaka area. The model turned out to give asignificant explanation of the interregional mode choice characteristics. Travel time, travelling expenses and " with or wi thout heavy baggage " were found to be significant.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-03-31
22巻
開始ページ 63
終了ページ 70
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307421
JaLCDOI 10.18926/15455
フルテキストURL Mem_Fac_Eng_OU_23_1_1.pdf
著者 松田 正明| 大崎 紘一|
抄録 Display equipment has been used as communication media in the factory, office, and home. In order to communicate effectively, it is necessary to clarify the characteristics of eye movement in the case of looking at the display. The development of Eye Camera enables us to measure eye movement during work, so that we can collect the many data of eye movement during work. In this study, we proposed a method to evaluate the visual work using the distribution of visual points in X and Y axis. The cumulative distribution is approximated by the logistic curve which shows the symmetry and kurtosis by the parameter. The proposed method was applied to the three typical display models, that is, the digital meter model, reading model, and game model. In the digital meter model, the visual points were distributed symmetrically along the meters, and the symmetry and kurtosis of the distribution varied by the arranged direction of the meter. In the reading model, the visual points were distributed nearly symmetrically and uniformly in each axis and they were moved around the character and line from the period of spectrum analysis. In the game model, the visual points moved according to the target and were distributed symmetrically in the Y axis. And whether the target moved vertically or horizontally, the kurtosis of the distribution became equal in each axis.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-11-22
23巻
1号
開始ページ 1
終了ページ 12
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307354
JaLCDOI 10.18926/15456
フルテキストURL Mem_Fac_Eng_OU_28_2_21.pdf
著者 山本 恭二| Jiao Xuezhen|
抄録 An experimental investigation has been made of the cyclone dust collector with a perforated internal rotating cylinder. The size of the rotating cylinder is of 0.5D, where D is the diameter of the cyclone body, and is the same size as the outlet tube. The dust collection efficiency as well as the pressure loss has been measured when the inlet flow speed is 9 ~ 21 m/s and the rotating speed of the cylinder is 37 ~ 63 m/s. The velocity and pressure distributions were also measured. It is found that the collection efficiency decreases and the pressure loss increases as the rotating speed increases. It is also shown that both the inward radial velocity and the upward vertical velocity become large as the rotating cylinder increases its speed. As a whole, the rotation of the internal cylinder makes worse performance of the cyclone dust collector.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 21
終了ページ 31
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307575
JaLCDOI 10.18926/15458
フルテキストURL Mem_Fac_Eng_OU_28_2_33.pdf
著者 Wang, Ming| Ahmed, Anis| 和田 修己| 古賀 隆治|
抄録 Proposed here is a convenient optical system to collimate the crescent shaped blue laser beam radiated from a Cerenkov SHG in channel waveguide configuration. This collimation system is consisted of a parabolic mirror and has a very large tolerance to the mirror displacement. The anisotropy of the nonlinear crystal on which the waveguide is fabricated has been taken into account. The optimum mirror location is given to obtain a collimated blue laser beam with an aberration less than 0.07λ. By using an objective lens, the collimated beam can be focused down to a thin beam with the spot size less than 1μm.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 33
終了ページ 44
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307149
JaLCDOI 10.18926/15459
フルテキストURL Mem_Fac_Eng_OU_23_1_31.pdf
著者 三浦 嘉也| Yuasa Motokazu| 尾坂 明義| 高橋 克明|
抄録 Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O(wt%) were prepared from hydrolysis and polycondensation of tetraethyl orthosilicate, trimethyl borate, and sodium methylate under the HCl catalysis. Variation of the gelation time is examined as a function of the mixing ratio of the starting materials and the catalyst. The thermal behavior of the gels has been discussed on the basis of their TG and DTA traces.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-11-22
23巻
1号
開始ページ 31
終了ページ 38
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307464
JaLCDOI 10.18926/15460
フルテキストURL Mem_Fac_Eng_OU_28_2_45.pdf
著者 東辻 浩夫| 橋本 成仁| 奈良 重俊|
抄録 Difficulties in simulating systems composed of classical and quantum particles lie in the treatment of the many-body interactions between quantum particles and the geometrical variety of configurations of classical particles. In order to overcome these difficulties, we have developed some numerical methods and applied them to simple cases. As for stationary states, the finite element method provides us with sufficient geometrical freedom. Combined with the Kohn-Sham equation based on the density functional theory, this method virtually satisfies our requirement. In order to investigate time-dependent phenomena, we apply the time-dependent Kohn-Sham equation. Adopting the finite difference method, we are able to follow the development of quantum many-body system. As an example, we estimate the effects of the potential height, the electric field, and many-body interactions in some transition processes in quantum wells coupled by a tunneling barrier. This example is important in itself in relation to semiconductor superlattices and also serves as a benchmark for quantum simulations, variety of geometry corresponding to that of classical particles.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 45
終了ページ 52
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307158