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 10.18926/15400
フルテキストURL Mem_Fac_Eng_OU_27_2_11.pdf
著者 岡 久雄| 山本 辰馬| Saratani Keiji| Tanaka Masahiro| Kawazoe Takayoshi|
抄録 The use of dental implants has increased together with increases in the human life span and it has become an imperative subject for dentists to familiarize themselves with this treatment modality. Unfortunately, there has been no practical and quantitative method for in vivo evaluation of the stability of dental implants. In the tooth mobility examination, the tactile sense of natural teeth is different from that of dental implants. The authors have developed an automatic diagnosis system of tooth mobility for clinical use. The biomechanical mobility of peri-implantium is measured with a pseudo-random vibration, from which the viscoelasticity c1, c2, k of peri-implantium is obtained. The diagnosis system has been applied to the quantitative evaluation of the stability of implants : endodontics endosseous implants (titanium pin), endosseous implants (Bioceram). It has also been applied to the evaluation of the long-term prognoses of dental implantation (Bioceram) and the examination of Intramobile implant (IMZ), and the satisfactory results have been obtained.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 11
終了ページ 17
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308018
JaLCDOI 10.18926/15370
フルテキストURL Mem_Fac_Eng_OU_27_2_73.pdf
著者 Kroumov Valeri T.| 井上 昭| 増田 士朗|
抄録 This report deals with the problem of designing an adaptive observer for estimating unknown periodical disturbances. This is very practical problem because in the area of control of servomechanisms such disturbances are always encountered. When the disturbance cannot be directly measured or eliminated at the source it is necessary to perform a prediction. When a periodical disturbance is present the frequencies appear as unknown parameters and they have to be identified. In order to identify the unknown parameters, it is necessary to transform the composite system model, which contains the models of the controlled system and the disturbances, into observable canonical form. In addition, an inverse transformation is required to calculate the estimates of the present disturbances. In this report, firstly, a review of an adaptive observer for estimation of unknown periodical disturbances is presented. Later a calculation of the disturbance estimate is derived using the algebraic programming system REDUCE. The proposed method here allows to perform all the necessary transformations and to obtain the disturbance estimation without using the transformation matrix. The calculations of these transformations are complicated and, hitherto, there is no simple method to perform them. The results of disturbance estimation are illustrated by two examples.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 73
終了ページ 85
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307731
JaLCDOI 10.18926/15406
フルテキストURL Mem_Fac_Eng_OU_27_2_59.pdf
著者 Prokop Jiri| Myojin Sho|
抄録 The paper presents methods for simulation and examination of the performance of a classification yard, including both manual and computer-aided methods. Presented methods are applicable to the simulation and examination of full range of yards of different types and sizes including manually operated as well as highly automated classification yards.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 59
終了ページ 71
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307384
JaLCDOI 10.18926/15404
フルテキストURL Mem_Fac_Eng_OU_27_2_41.pdf
著者 Prokop Jiri| Myojin Sho|
抄録 The fundamental objective of this paper is to aggregate and establish a set of practical principles, guidelines, and procedures to clarify and improve classification yard design and to enhance the efficiency of the design process. The paper primarily addresses theoretical and technical aspects of hump yard height and grade design, placement of the switches and the retarders. It attempts to compile and document yard design procedures, based on the Theory of Energy Head and Energy Loss. This procedures are applicable to the design of new yards, rehabilitation of the existing yards of different types and sizes including manually operated as well as highly automated classification yards.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 41
終了ページ 58
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307241
JaLCDOI 10.18926/15399
フルテキストURL Mem_Fac_Eng_OU_27_2_1.pdf
著者 梶原 康博| 大崎 紘一|
抄録 Precedence relation in assembly has been determined by experience only. Now, an expert system is developed for determining such precedence relation. The conjugate states of the units of a product are shown in face frames and unit frames following the frame model. Seven rules are formulated. They consider geometrical interference of units, and make the precedence relation enable operation time to be shorter, and the number of JIG and substandards to be smaller. These rules are programized by computer language(PROLOG).
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 1
終了ページ 9
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307210
JaLCDOI 10.18926/15403
フルテキストURL Mem_Fac_Eng_OU_27_2_19.pdf
著者 奈良 重俊| 東辻 浩夫|
抄録 Numerical simulations of a single layer recurrent neural network model in which the synaptic connection matrix is formed by summing cyclic products of succesive patterns show that complex dynamics can occur with the reduction of a connectivity parameter which is the number of connection between neurons. The structure in these dynamics is discussed from the viewpoint of realizing complex function using complex dynamics.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 19
終了ページ 40
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307451
JaLCDOI 10.18926/15392
フルテキストURL Mem_Fac_Eng_OU_27_1_45.pdf
著者 香川 直己| 和田 修己| Hai, Xu| 古賀 隆治| Sano, Hiroya| Inubushi, Kazuyuki|
抄録 A prototype device based on the tunable diode laser absorption spectrometry was constructed and the atmospheric methane concentration near the terrain in a rice paddy field was measured. An open optical path of 50 m length was employed along with a PbSnTe diode laser. Diurnal change of methane density with 30 seconds temporal resolution was recorded associated with meteorological parameters. A feasibility was proven for a practical application for in situ study of atmospheric methane.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 45
終了ページ 53
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307877
JaLCDOI 10.18926/15398
フルテキストURL Mem_Fac_Eng_OU_27_1_93.pdf
著者 西垣 誠| Sudinda Teddy| Hishiya Tomoyuki| 河野 伊一郎|
抄録 In this paper the author will be describe phenomena of advection dispersion in subsurface flow by using Eulerian Lagrangian Finite Element Method. Where Finite Element Method with Galerkin formulation and weigthed residual method is used to solve seepage and advection dispersion equation. The problem of one dimensional and two dimensional rectangular wave are analyzed in this paper. And the result of numerical analyses will be compared with analytical solutions. The numerical results showed the very good agreement with the analytical solutions.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 93
終了ページ 105
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307768
JaLCDOI 10.18926/15394
フルテキストURL Mem_Fac_Eng_OU_27_1_55.pdf
著者 東辻 浩夫| Tachibana Hiroyuki| Hashimoto Seiji| 奈良 重俊|
抄録 The ground state of a system of electrons accumulated in a pair of coupled symmetric quantum wires is analyzed on the basis of density functional theory. It is shown that, in a domain of physical parameters, electrons are localized in either of wires. The main contribution to the total energy of this system comes from the Hartree energy, or the electrostatic energy, and the exchange-correlation energy between electrons. The ground state is determined by a competition between these contributions: We have symmetric electron distributions when the Hartree energy dominates and asymmetric (localized) states are realized in the opposite case. This kind of simple system with bistable electronic states may be applied to semiconductor memory devices.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 55
終了ページ 64
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307892
JaLCDOI 10.18926/15396
フルテキストURL Mem_Fac_Eng_OU_27_1_81.pdf
著者 阿部 宏史|
抄録 This paper aims to examine the impact of JR (Japan Railways) Seto Ohashi Line on residential land value. First, the study examines the trends in land value in the area along JR Seto Ohashi Line by applying the area comparison method. The method estimates the effect of JR Seto Ohashi Line on residential land value by comparing land values between the study area and the Okayama Metropolitan Area. Second, the property value method is applied to measure the effect of railroad construction. The effect is estimated with a residential land-value regression, which is calibrated using land value data along the Seto Ohashi Line. Finally, the results are compared with the empirical studies in the Greater Tokyo Region, and various features of the impact of railroad construction on land value are identified.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 81
終了ページ 92
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307856
JaLCDOI 10.18926/15390
フルテキストURL Mem_Fac_Eng_OU_27_1_27.pdf
著者 Hirashima Masao| 稲葉 英男|
抄録 Heating and refrigerating technique such as snow melting of road and cold storage by utilizing temperature difference between underground soil and atmosphere is widely used[1-4] in a cold area. In the 1st Report, heat transfer characteristics of two phase closed thermosiphon for extracting geothermal energy is studied fundamentally. In the empirical study, heat extract rate is measured in connection with the change of atmospheric temperature utilizing real two thermosiphons on the site. Temperature distribution on the surface of the thermosiphon and underground soil around it is also measured. Based on the data of the empirical experiment, it is confirmed that prevention of freezing for fire hydrant can be achieved by geothermal heat utilizing two phase closed thermosiphon. Present paper describes the heat transfer behavior of the thermosiphon as the 2nd report.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 27
終了ページ 32
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307336
JaLCDOI 10.18926/15388
フルテキストURL Mem_Fac_Eng_OU_27_1_11.pdf
著者 Hirashima Masao| 稲葉 英男|
抄録 To prevent freezing of road and aquaduct by extracting geothermal heat with two phase closed thermosiphon has been widely used in a cold area. Both heat transfer characteristics in the underground soil and function of the thermosiphon to extract geothermal heat have to be made clear for the purpose of the above system. This study is directed for the purpose to prevent freezing of fire hydrant and composed of the fundamental experiment and the empirical experiment. In the fundamental study, heat transfer behavior is studied experimentally in the small size filling bath representing the underground soil layer. After recording temperature distribution, heat transfer coefficient is measured, they are proceeded into the correlation between the dimensionless number of Nusselt, Rayleigh and Fourier. The fundamental study is described as the first report.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 11
終了ページ 26
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307419
JaLCDOI 10.18926/15385
フルテキストURL Mem_Fac_Eng_OU_27_1_1.pdf
著者 Uno, Yoshiyuki| Kubota, Shin-ichiro| Nakajima, Toshikatsu| Ogata, Kojiro| Tada, Nobuhiko|
抄録 Direct patterning of copper coated ceramic circuit board is experimentally investigated with Q-switched Nd:YAG laser in order to shorten the time of the trial manufacture of electronic circuit board and to adapt the flexible design change. It is pointed out that the fast direct patterning the speed of which reaches about 100 mm/s is possible if the repetition frequency and the average power are selected properly. Furthermore cutting off and/or drilling of ceramic board are also possible under the condition that the repetition frequency is less than 3kHz. This technique makes it possible the mask1ess patterning of ceramic circuit board which has been widely used recently in place of conventional glass-epoxy or phenolic resin circuit board, and it leads to the shorter time limit of delivery as compared with the conventional end-milling method.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 1
終了ページ 10
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307702
JaLCDOI 10.18926/15391
フルテキストURL Mem_Fac_Eng_OU_27_1_33.pdf
著者 島田 行恭| 鈴木 和彦| 佐山 隼敏|
抄録 Neural nets have recently become the focus of much attention, largely because of their wide range of complex and nonlinear problems. This paper presents a new integrated approach using neural networks for diagnosing process failures. The fault propagation in process is modeled by causal relationships from the fault tree and its minimal cut sets. The measurement patterns required for training and testing the neural network were obtained from fault propagation model. The network is able to diagnose even in the presence of malfunction of certain sensors. We demonstrate via a nitric acid cooler process how the neural network can learn and successfully diagnose the faults.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1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 120002307902
JaLCDOI 10.18926/15395
フルテキストURL Mem_Fac_Eng_OU_27_1_65.pdf
著者 奈良 重俊| Hara Yuji| 東辻 浩夫|
抄録 Quantum mechnical electron wave transfer between two quantum wires which are weakly coupled via a thin potential barrier is considered. The total electronic states are calculated with both analytical ( no field case ) and numerical methods ( under applied electric fields ). The transfer efficiency is evaluated for several specified cases of geometrical structures, potential barrier heights and the externally applied electric field. Estimated trasfer time is of the order of one picosecond in typical mesoscopic structures. The model in this paper can be used to determine important structure parameters for experiments on electron directional coupler controled by external elctric field.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-11-25
27巻
1号
開始ページ 65
終了ページ 79
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307405
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 10.18926/15439
フルテキストURL Mem_Fac_Eng_OU_26_2_77.pdf
著者 和田 修己| Nakajima Masamitsu|
抄録 This paper describes a method to design an antenna to focus millimeter-wave beam generated by a gyrotron. The antenna, which has been proposed by the authors, consists of a stair-cut circular waveguide and two cylindrical reflectors; one is elliptic and the other is parabolic. Its principle is based on the geometrical optics though slightly modified to consider the diffraction effect. Results of low-power experiments agree well with the design on beam direction, beam width and the position of the focal point. At 35.5 GHz using TE(01) mode, a focused beam with half-power thickness of 13 mm x 10 mm was obtained. This type of antennas find applications to millimeter-wave scattering measurement in fusion plasma research and high- energy-density source for material heating.
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 77
終了ページ 92
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307321
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