JaLCDOI | 10.18926/15490 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_25_1_51.pdf |

著者 | 東辻 浩夫| |

抄録 | The superconductivity proximity effect in the dirty limit is revisited and equations and boundary conditions are obtained for the case of inhomogeneous media with continuously varying characteristic parameters. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-12-14 |

巻 | 25巻 |

号 | 1号 |

開始ページ | 51 |

終了ページ | 57 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307188 |

JaLCDOI | 10.18926/15491 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_11.pdf |

著者 | 榊原 精| Kanadani, Teruto| |

抄録 | Aging behavior of Al-0.23mass % Si alloy was studied by measurements of elecrical resistivity. Resistvity maximum was observed in the aging curves at 273K after quenching from various temperatures. Appearance of maximum and its dependence on the quenching temperature were attributed to the formation of GP zones. Even in a more dilute alloy as 0.01mass % Si, the maximum of resistivity was also recognized. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 11 |

終了ページ | 16 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307615 |

JaLCDOI | 10.18926/15493 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_17.pdf |

著者 | 小西 忠孝| 馬場 充| |

抄録 | Pressure distribution has been measured and analyzed to clarify the fundamental characteristics of "continuous oil-film" formed in a transparent journal bearing, into which oil in general use is supplied. Measured pressure mostly shows quasi-Sommerfeld distribution, which is characterized by downstream shift of pressure profile and underdevelopment of pressure trough compared with Sommerfeld distribution for perfect oil-film. Sommerfeld distribution is approximately observed only under limited conditions : low eccentricity and low speed. Quasi-Sommerfeld state is rather common in "continuous oil-film", unruptured film formed by using practical lubricants, than Sommerfeld state. Continuous oil-film is accompanied by fine bubbles and is controlled by the growing up or down of the bubbles. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 17 |

終了ページ | 30 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307431 |

JaLCDOI | 10.18926/15494 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_25_1_71.pdf |

著者 | Myojin Sho| Yamada Masahito| Fujii Naoto| |

抄録 | A transportation planning way of approach is applied to optimal pricing and planning of urban expressway network. Two kinds of network are investigated ; four radials with one ring system and four radials with two rings system. The model is composed of three submodels ; road systell, trip generation-attraction and traffic diversion. Some iaplicative aspects are shown of the optimal solutions that maximize the aggregate number of the trips diverted to expressway under constraints ; equilibrium of revenue and expenditure and traffic capacity constraint. (1) traffic flow has the peaks at junctions on radial expressway that are adjusted to be equal to the traffic capacity. (2) two rings system realizes the larger aggregate number of diverted trips by lower toll rate than one ring system does. (3) well-located second ring has a remarkable effect on improvement in accessibility to expressway and (4) some parameters in the model have curious effects on the optimal system. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-12-14 |

巻 | 25巻 |

号 | 1号 |

開始ページ | 71 |

終了ページ | 87 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307618 |

JaLCDOI | 10.18926/15496 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_25_1_89.pdf |

著者 | 阿部 宏史| Oishi Manabu| |

抄録 | Multidimensional scaling (MDS) has been used in a wide variety of research fields; psychology, political science, anthropology, marketing research, urban and regional planning, and so on. In practical terms, MDS is a statistical method to make a picture of the information in the data. It enables us to examine the "hidden structure" of a set of data. When the set of data is large, MDS is extremely useful, since it is easier and more informative to look at a picture than the data themselves. In this paper, MDS is applied to the interregional migration data of Japanese regions for the years 1960-85. Findings show that the two-dimensional configuration of regions estimated by MDS generally corresponds with the geographical locations of regions, and the structure of interregional migration was very stable over the study years 1960-85. It is also suggested that MDS is a useful tool to identify the relationships between regions using the spatial interaction data. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-12-14 |

巻 | 25巻 |

号 | 1号 |

開始ページ | 89 |

終了ページ | 98 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307404 |

JaLCDOI | 10.18926/15497 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_41.pdf |

著者 | 東辻 浩夫| |

抄録 | A possibility to control the microscopic superconducting channel based on the proximity effect is theoretically shown by a simple one-dimensional analysis of de Gennes' equation for the order parameter. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 41 |

終了ページ | 47 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307289 |

JaLCDOI | 10.18926/15499 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_49.pdf |

著者 | 森 忠次| Machida Ken-ichi| |

抄録 | Distance measurements have been more and more easy and accurate to carry out, and it is expected that distance mesurements may provide rather accurate results than angle measurements. Under these circumstances, caracteritics of errors in typical trilateration nets are investigated. The nets investigated are as follows: From single row of chains to pranimetrically extended nets in figure, open and closed networks with respect to external constraint, and with and without as to internal constraint. Computations are performed by use of the method of condition equations, and behaviours of error propagation and errors of coordinates of stations in the nets are shown in case of typical nets. For example, effects for decrease in error by composing a double row of chains and by enforcing external constraints are explained. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 49 |

終了ページ | 65 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307544 |

JaLCDOI | 10.18926/15502 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_79.pdf |

著者 | 佐藤 洋一郎| |

抄録 | In asynchronous arbiters, failures may happen, caused by metastable operations. The purpose of this study is to derive a formula to estimate such failures in a ring arbiter as mean time between failures (MTBF), under the condition that incidences of requests issued in all devices are different from each other. The operation of the arbiter is formularized by a markov chain. This chain is used to decide the probability at which each of possible failures contributes to MTBF. The sum of such probabilities gives the MTBF which can be represented as a sum of a finite number of terms. As an example, MTBF of a ring arbiter composed of 3 cells is shown. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 79 |

終了ページ | 87 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307486 |

JaLCDOI | 10.18926/15503 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_25_2_9.pdf |

著者 | Mikuni, Masato| 飛田 守孝| Nishida, Norihide| 榊原 精| 山田 益男| |

抄録 | Strains induced in the Si substrates by TiN film were observed with X-ray topography. The image of the sample with TiN film 0.45μm thick was like that of a dislocation loop observed with transmission electron microscope. The images of the samples with TiN films 1.65, and 1.9μm thick were different; blackening spreaded in the <112> and <110> direction from the ring contrast in shape of four-lobed rosette pattern. Spreading extended 1.6 times longer than the radius of the ring contrast along the <112> direction. The strain field extended 0.1μm in depth from the top surface where TiN was plated. From the topographs of bent Si beam, it was found that the blackness was almost proportional to the strain. The strains induced by TiN film locally ion-plated were smaller than those observed previously when TiN was ion-plated on the whole top surface of the substrate. Fine structures were observed in the topographs which could not be explained by the kinematical theory. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1991-03-28 |

巻 | 25巻 |

号 | 2号 |

開始ページ | 9 |

終了ページ | 15 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307429 |

JaLCDOI | 10.18926/15506 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_25_2_17.pdf |

著者 | 榊原 精| Kanadani, Teruto| Kaneeda, Toshiaki| Hosokawa, Norio| |

抄録 | Effect of the soft surface layer that was formed on low temperature aging of Al-Zn alloy on fatigue strength was studied under repeated tensile loading. Vickers microhardness test revealed that there existed less hardened region in the vicinity of grain boundary and surface, and that the region extends 50 to 100μm from the surface inward. From the plot of the stress amplitude against the number of cycles to failure, it is concluded that the presence of less hardened surface layer strengthens fatigue resistance of the age hardened Al-Zn alloys containing 8 to 16mass % Zn under the repeated tensile loading. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1991-03-28 |

巻 | 25巻 |

号 | 2号 |

開始ページ | 17 |

終了ページ | 23 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307685 |

JaLCDOI | 10.18926/15507 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_99.pdf |

著者 | 谷口 健男| Fujiwara Kohji| |

抄録 | This paper presents an effective solver for a large sparse set of linear algebraic equations, which appears at the application of the finite element and the finite difference methods in engineering field. Proposed method is a family of SKYLINE METHOD, and for faster computation on the vector processors the original skyline is modified with respect to following three items; the use of inner products of matrix operations, the removal of unnecessary numerical operations and the introduction of two-dimensional array for storing the data of coefficient matrix. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 99 |

終了ページ | 112 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307515 |

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 |

巻 | 25巻 |

号 | 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 | 10.18926/15513 |
---|---|

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 |

巻 | 25巻 |

号 | 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 |

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 |

巻 | 25巻 |

号 | 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 | 10.18926/15516 |
---|---|

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 |

巻 | 25巻 |

号 | 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 | 10.18926/15517 |
---|---|

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 |

巻 | 25巻 |

号 | 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 | 10.18926/17833 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_27.pdf |

著者 | 東辻 浩夫| |

抄録 | When the Coulomb coupling between fine particles becomes sufficiently strong in fine particle plasmas, the isothermal compressibility of the whole system diverges and we have a phase separation and an associated critical point. Experimental conditions of fine particle plasmas, densities and temperatures of components and the fine particle size, are obtained corresponding to characteristic parameters around the critical point and the dependency on ion species and other factors is discussed. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 27 |

終了ページ | 31 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308947 |

JaLCDOI | 10.18926/17835 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_32.pdf |

著者 | 馬渕 周治| 小西 正躬| 今井 純| |

抄録 | A tractor-trailer vehicle in the factory might move on the route determined beforehand. However, automation of a tractor-trailer vehicle is difficult so that it is necessary to consider the nonlinearity of a vehicle and a trailer. In this research, the effective tracking control method of a tractor-trailer vehicle is proposed. The control method using time-state control form for a preview control is presented, and be applied a tractor-trailer vehicle with nonholonomic characteristics. Results of numerical experiments are presented to check effectiveness of the proposed control method. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 32 |

終了ページ | 38 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308736 |

JaLCDOI | 10.18926/17837 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_39.pdf |

著者 | 桑嶋 崇行| 今井 純| 小西 正躬| |

抄録 | This paper presents method of the controller design for one link arm with parametric uncertainty. Recently, many manufacturing robots are operated in manufacturing facilities, with the aim of labor and cost saving or improvement of the productivity. Such robots need to have positioning performance of high precision. In condition that there is an uncertainty in plant dynamics, desired control performance may not be attained because the controller is designed according to the mathematical model of a plant. So it is important that the designed control system have a robust control performance. In this paper, the robust controller is designed using Quantitative Feedback Theory (QFT) for one link arm with parametric uncertainty. Simulation experiments are run for control system designed by using QFT and conventional method. The results are compared with each other and it is found that the control system designed by QFT shows a robust performance and can suppress the unevenness of output against parametric uncertainty. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 39 |

終了ページ | 48 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308875 |

JaLCDOI | 10.18926/15381 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_30_1_75.pdf |

著者 | 東辻 浩夫| 井上 嘉彦| 岸本 篤也| 東辻 千枝子| 奈良 重俊| |

抄録 | Molecular dynamics of the Yukawa system, the system of particles interacting via the Yukawa or the screened Coulomb potential, are formulated for various statistical ensembles and external conditions. The Yukawa potential smoothly interpolates the long-range Coulomb and the short-range interactions by adjusting a single parameter, the screening length. In order to reduce the effect of boundaries, the periodic boundary conditions are imposed and the deformations of the fundamental vectors of periodicity are taken into account. Ewald-type expressions for interaction energy, force, and kinematic pressure are given explicitly. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1995-12-28 |

巻 | 30巻 |

号 | 1号 |

開始ページ | 75 |

終了ページ | 87 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307479 |