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 10.18926/15473
フルテキストURL Mem_Fac_Eng_OU_26_2_61.pdf
著者 Osaka, Akiyoshi| Kawabata Kouji| Nanba, Tokuro| Takada, Jun| Miura, Yoshinari|
抄録 Mullite-dispersed silica ceramics were prepared through sol-gel processing by the use of tetraethoxy silane, aluminium nitrate and aluminium isopropoxide as the Si and Al sources where HCl and HN0(3) were the catalyst. Effect of the starting materials, solvents and catalysts was examined on the gelation time or temperature of mullite precipitation. Apparent activation energy of gelation ranged from 80 to 95kJ/mol. The presence of AI in the sols elongated the gelling time suggesting the formation of chelate bonds between AI and Si-OR or Si-OH bonds.
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 61
終了ページ 67
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307416
JaLCDOI 10.18926/15425
フルテキストURL Mem_Fac_Eng_OU_26_2_1.pdf
著者 稲葉 英男| 大竹 秀雄| 野津 滋|
抄録 Radiative characteristics of the frost layer melted by radiative heat are experimentally examined. A frost layer is heated from above by the radiative heat from a halogen lamp set. Thermal radiation of the lamp has the wavelength spectrum characteristics similar to those of the solar radiation. The effect of the environmental temperature upon the frost melting process is clarified in experiments. The optical characteristics of reflectivity, absorptivity and transmissivity of the frost layer during the melting of the frost layer are measured using special measuring instruments.
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 1
終了ページ 16
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307428
JaLCDOI 10.18926/15427
フルテキストURL Mem_Fac_Eng_OU_26_2_17.pdf
著者 Feng Yibu| 稲葉 英男| 野津 滋|
抄録 Heat transfer measurements were conducted during freezing of quiescent water in a horizontal cylinder. A horizontal cylinder with inner diameter of 61.1 mm is cooled by air in a constant low temperature room and time variations of the radial distribution of fluid temperature were observed. Experimental results for the velocity of the phase change interface, the time taken for complete freezing and apparent freezing heat transfer coefficient were compared with the simple theoretical model based on the quasisteady assumption.
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 17
終了ページ 24
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307382
JaLCDOI 10.18926/15429
フルテキストURL Mem_Fac_Eng_OU_26_2_25.pdf
著者 松田 正明| 大崎 紘一|
抄録 The eye movement has been studied widely, because it gives various information about the characteristics of visual work. Almost all of those studies have concentrated on the distribution of the visual points, the direction and width of the saccadic movement and the fixation time of the measures. However there are few measures to evaluate the relationship between the visual objects and eye movement. Recently, the personal computer become portable and this makes it possible to analyze the many data and to show the results graphically on the experimental field. In this study, we propose a series of methods to evaluate how a subject looks at a visual field using the queue theory, and how often man looks at the central part of the visual field using the statistical two-dimensional ellipse. We developed the Pascal program on an personal computer(NEC PC9800). This program has 3 functions. One is the measurement of eye movement, the second is the calculation of the proposed measures and the third is the display of the results of these calculations.
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 25
終了ページ 41
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308015
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 10.18926/15412
フルテキストURL Mem_Fac_Eng_OU_26_1_21.pdf
著者 野津 滋| 稲葉 英男|
抄録 A numerical study is performed for the facilitated diffusion of carbon-dioxide in an ultrapure water film flowing downward along a vertical surface. The model adopted for the present work includes the effects of the reaction rate for the hydration of CO(2)in a liquid. Comparison of the total concentration of CO(2) for different film thickness indicates that the effects of the hydration is more remarkable for the thinner liquid film.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 21
終了ページ 26
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307958
JaLCDOI 10.18926/15410
フルテキストURL Mem_Fac_Eng_OU_26_1_9.pdf
著者 Uno, Yoshiyuki| Nakajima, Toshikatsu| Okada Minoru|
抄録 Practical utilization of ram type electrical discharge machining in uninflammable fluid has been expected in place of inflammable kerosine type fluid for unmanned operation in a workshop. The electrical discharge machining performance in deionized water is experimentally investigated on the basis of the analysis of the crater generated by a single pulse discharge. The experimental analysis makes it clear that the electrical discharge machining performance in deionized water is greatly affected by the electrode polarity. The metal removal rate in the normal polarity machining is higher than that in reverse polarity machining, while the electrode wear rate in the normal polarity machining is greater than that in reverse polarity machining. Therefore the electrode polarity should be properly selected according to the purpose of machining.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 9
終了ページ 20
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307319
JaLCDOI 10.18926/15416
フルテキストURL Mem_Fac_Eng_OU_26_1_43.pdf
著者 Bouzidi, Moncef| 古賀 隆治| 和田 修己| 香川 直己| Hai Xu| 小坂 恵| Sano HIroya|
抄録 A numerical technique called as "adjoint spectrum" has been proposed by the authors in a previous work. Two applications of it are presented here. It is demonstrated that by generalizing the aspect of adjoint spectrum it becomes possible to measure densities of mixed gases simultaneously. An experimental proof of this has been carried on and simultaneous measurement of densities of both methane and dinitrogen oxide was realized. On the other hand, it is also reported that frequency shifting of spectra, which is a cause of error in spectrometric measurements, can be corrected by exploiting the adjoint spectrum technique in connection with the Taylor expansion. Numerical examples showing the success of this method are reported as well.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 43
終了ページ 49
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307796
JaLCDOI 10.18926/15414
フルテキストURL Mem_Fac_Eng_OU_26_1_27.pdf
著者 冨田 栄二| Nsunge Felix Chintu| 浜本 嘉輔|
抄録 Distributions of hydrogen gas concentration in a suddenly started, single shot hydrogen gas jet issuing from a 1 mm diameter injector into still air were measured using laser interferometry method. This unsteady, turbulent free jet flow has also been calculated using the two-equation, high Reynolds number version of k-ε turbulence model and hybrid scheme for treating combined diffusion and convection in the SIMPLE algorithm. The injection pressure was 0.5 MPa for which predicted and measured temporal jet tip penetration distributions indicate that the jet discharged into still air at Mach 0.25. The level of agreement between present prediction and measurement is good in some regions and poor in others.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 27
終了ページ 41
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307648
JaLCDOI 10.18926/15407
フルテキストURL Mem_Fac_Eng_OU_26_1_1.pdf
著者 榊原 精| Kanadani, Teruto|
抄録 Reversion of the age-hardened Al-15mass % Zn alloy, in which ellipsoidal GP zones were formed, was investigated by hardness test. Ellipsoidal zones were reverted more quickly near the surface and grain boundary than in the interior, as spherical zones did. The results confirm their role as sources for vacancies in reversion.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1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 120002308003
JaLCDOI 10.18926/15423
フルテキストURL Mem_Fac_Eng_OU_26_1_95.pdf
著者 川上 浩司| 小西 忠孝|
抄録 This paper describes a method to construct IDEA BANK automatically. IDEA BANK is the data base of the "function-structure module" which is utilized in systematic conceptual design from Value Engineering perspectives. The method based on the Machine Learning EBL technique was evaluated and implemented for the IDEA BANK using SUN workstation. The practical implementation of the IDEA BANK acquisition was discussed after elucidating the problem and solution of the EBL technique in engineering design. In the IDEA BANK system, the structural features of an existing article are analyzed by hierarchically organized domain specific knowledge to yield a systematic explanation of how they function and attain their design goals. The explanation resulted in a generalized version of the Functional Diagram used in Value Engineering from which "function-structure module" can be extracted systematically.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 95
終了ページ 108
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307756
JaLCDOI 10.18926/15421
フルテキストURL Mem_Fac_Eng_OU_26_1_75.pdf
著者 Myojin Sho| Noguchi Hisahumi| Yamada Masahito|
抄録 Four radials-single ring urban expressway network is priced and, simultaneously, optimized in its spatial formation under the constraint that a balance must be kept of revenue and expenditure. The model consists of three sub-models: road system, car trip generation-attraction and traffic diversion. Network performance is assessed on two criteria; trip number criterion on which the aggregate number of car trips diverted onto expressway is maximized and travel hour criterion on which the travel hours of car trips integrated over the road system; surface and expressway, is minimized. Optimization is tried by numerical calculation for some sets of parameters in the model. The results are summarized as follows; (1) simultaneous optimization of price and spatial formation of the expressway network is possible on each of criteria, (2) trip number criterion produces lower pricing and smaller network while travel hour criterion does higher pricing and larger network, (3) optimum solution lies in a delicate relation of price and spatial network formation that comes from the balance constraint.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 75
終了ページ 94
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307318
JaLCDOI 10.18926/15418
フルテキストURL Mem_Fac_Eng_OU_26_1_51.pdf
著者 東辻 浩夫| Shirokoshi Hideki| 奈良 重俊|
抄録 Variable shape molecular dynamics is formulated for the one-component plasma and the structural transition from the fcc lattice to the bcc lattice has been observed. It is emphasized that the condition of constant volume should be imposed when deformations of periodic boundary conditions are taken into account.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 51
終了ページ 59
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307555
JaLCDOI 10.18926/15420
フルテキストURL Mem_Fac_Eng_OU_26_1_61.pdf
著者 河原 長美| Danno Hideki| Kunimatsu Takao|
抄録 Lake Biwa is the largest lake in Japan, and one of the most important fresh water resources. The Hino River is the fourth largest river among the rivers which flow into Lake Biwa. The eutrophication of the lake has been warned since the 1960s. In order to improve the water quality of the lake, to decrease the loads through rivers is inevitable. Therefore, it is needed to predict the effects of measures to control pollutant loads and the influence of development in the basin on the loads from rivers before developing the basin and taking measures. This paper deals mainly with the model of water quality management for the Hino River and the effects of the development in the basin on the water quality. The model was formulated considering loads from forests, rice paddy fields, households, housing land, industrial factories. Using this model, a calculation system by a microcomputer was developed and the influence of urbanization of the basin was discussed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-11-30
26巻
1号
開始ページ 61
終了ページ 73
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307182
JaLCDOI 10.18926/15512
フルテキストURL Mem_Fac_Eng_OU_25_2_69.pdf
著者 Tsuchiya Takao| 加川 幸雄|
抄録 A finite element approach to the calculation of nonlinear sound propagation is proposed. Under the assumption of a weak nonlinearity, a linearized one-dimensional equation is considered. The equation is discretized in space, and is then solved for time by using Newmark-β integration scheme, in which a numerical damping is devised. Some numerical demonstrations are made for the nonlinear sound propagation of a single-shot pulse in air. It is shown that the shock wave propagation is stably and accurately simulated by the introduction of the numerical damping.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-03-28
25巻
2号
開始ページ 69
終了ページ 80
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307747
JaLCDOI 10.18926/15517
フルテキストURL Mem_Fac_Eng_OU_25_2_123.pdf
著者 Taniguchi, Takeo| Ohta, Chikashi|
抄録 The aim of this investigation is the proposal of 3D mesh generation method based on the Delaunay triangulation. The method is valid for the finite element modelling of any convex 3D domain into tetrahedra with optimum geometrical configuration. This paper includes the mathematical background of the mesh generation method, its detail, proposal of some efficient tools for faster and more rigorous computations, and some examples of the mesh generation.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-03-28
25巻
2号
開始ページ 123
終了ページ 133
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307904
JaLCDOI 10.18926/15516
フルテキストURL Mem_Fac_Eng_OU_25_2_115.pdf
著者 谷口 健男| Irie Hirotsugu|
抄録 Nested dissection method is an elimination method for a set of linear algebraic equations with minimum fillins. Physically it divides a domain into four subdomains, and each subdomain is again divided into four. This procedure is repeated till all nodes are included in some subdomains. Using this characteristic, the authors examine the efficiency of the method on the transputer.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-03-28
25巻
2号
開始ページ 115
終了ページ 122
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307316
JaLCDOI 10.18926/15515
フルテキストURL Mem_Fac_Eng_OU_25_2_95.pdf
著者 Totsuji, Hiroo| Ishikura Satoshi| Takayama Norihisa|
抄録 Critical temperatures of two-dimensional microstructures with superconducting proximity effect in the dirty limit are evaluated for various geometrical constructions. As a numerical method, the finite element method is applied. Guidelines in estimating critical temperatures are given for the case where the decay of superconducting order parameter is either sufficiently slow or fast in comparison with the scale length of the structure.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-03-28
25巻
2号
開始ページ 95
終了ページ 113
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307413
JaLCDOI 10.18926/15513
フルテキストURL Mem_Fac_Eng_OU_25_2_81.pdf
著者 Totsuji, Hiroo|
抄録 Numerical methods for the analysis of the proximity effect in superconducting microstructures in the dirty limit are formulated on the basis of the finite element method. One- and two-dimensional cases are considered and third order Hermite shape functions are used. The results are also applicable to investigations of electronic states in semiconductor superlattice structures.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1991-03-28
25巻
2号
開始ページ 81
終了ページ 93
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307242