result 48264 件
| JaLCDOI | 10.18926/15837 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_2_1.pdf |
| Author | Takemoto Yoshito| Hida Moritaka| |
| Abstract | We investigated the effects of resolved interstitial oxygen or nitrogen atoms and of quenched-in strain on the hardening of the single crystals grown from molten Ti-14 and 20wt pct Mo alloys. The aging treatment at 623K in atmosphere much more increased in the hardness of specimen surface than that in argon atmosphere. The quenched-in compressive stress enhanced age hardening due to omega formation. We surveyed in detail the hardness changes toward the center of plate-shaped single crystal. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1987-03-05 |
| Volume | volume21 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 7 |
| ISSN | 0475-0071 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307640 |
| JaLCDOI | 10.18926/15836 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_81.pdf |
| Author | Nago Hiroshi| Maeno Shiro| |
| Abstract | Under the attack of storm waves, there are many destructions of coastal structures due to scouring, sinking and sliding. These types of destructions are considered to be in close relation to the dynamic behavior of sand bed around the structures. In this study the characteristics of pore water pressure and stresses in the sand bed around a breakwater under the attack of superposed waves are treated theoretically. The results show that during the crest or the trough being in front of the structure the strength of sand bed around the structure decreases notably and the unstable zone will occur. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 91 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307224 |
| JaLCDOI | 10.18926/15835 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_71.pdf |
| Author | Takeshita Yuji| Nishigaki Makoto| Kohno Iichiro| |
| Abstract | It is difficult to determine the coefficients of groundwater flow from the data which were obtained from the drawdown test in a multiaquifer system. In this paper, new methods of analyzing drawdown-tests are developed and illustrated with the example to determine aquifer coefficients. In a double-layered aquifer, the analytical solution of drawdown test, in which water is discharged from both layers, is derived. And also the theoretical solution to determine the coefficient of storage by using an index of elasticity of a confined aquifer is derived. From these solutions, methods of determining the coefficient of transmissibility in a double-layered aquifer and the coefficinent of storage in a confined aquifer are got. The example analysis to determine aquifer coefficients is shown. As a result, the characteristics which were obtained by these methods are verified by the real drawdown test data. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 71 |
| End Page | 79 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307954 |
| Author | Kira, Shohei| Ogata, Masana| |
|---|---|
| Published Date | 1988 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume100 |
| Issue | issue1-2 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/15833 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_2_31.pdf |
| Author | Taniguchi Takeo| Ikuta Shusaku| |
| Abstract | New estimation method of the optimum relaxation factor for the successive overrelaxation method (SOR) is proposed, and the efficiency of the new method is surveyed through a number of numerical experiments. This method can a priori determine the value of the factor by using only the topological properties of the problem, and it is valid for a sparse set of linear equations obtained by using the five-point difference scheme for any rectangular area with arbitrary boundary conditions. The experiments clarify that the method can estimate good approximate value of the factor. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-06-30 |
| Volume | volume17 |
| Issue | issue2 |
| Start Page | 31 |
| End Page | 46 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307996 |
| JaLCDOI | 10.18926/15832 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_57.pdf |
| Author | Sakata Kenji| Kohno Iichiro| |
| Abstract | New prediction equations of shrinkage and creep of concrete are proposed, and the efficiency of the new equations are investigated through a number of experimental data. Furthermore,the characteristics and applications of the prediction equations presented in the codes of many countries are also discussed. The results showing that the new equations could estimate shrinkage and creep of concrete within a certain measure of accuracy were obtained. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 57 |
| End Page | 70 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307146 |
| JaLCDOI | 10.18926/15831 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_45.pdf |
| Author | Totsuji Hiroo| |
| Abstract | The total charge fluctuation spectrum of ionic mixtures is analyzed on the basis of the solution of the hypernetted-chain equation for the binary ionic mixtures. A simple but sufficiently accurate scaling law in the domain of intermediate coupling is obtained and the result is applied to the calculation of the bremsstrahlung emission and absorption rates in high density plasmas composed of ions of many species. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 45 |
| End Page | 55 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307995 |
| JaLCDOI | 10.18926/15830 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_31.pdf |
| Author | Totsuji Hiroo| |
| Abstract | Surface properties of classical one-component plasma are investigated by numerical experiments on the system with periodicity in two directions perpendicular to the planar surface. The density profile, the electrostatic potential, the electric field, and the surface energy are obtained for intermediate values of the coupling parameter of bulk part r and compared with earlier experiments on spherical system. For r=10, the surface energy is almost the same as earlier result. For r =1, however, the surface energy is reduced about a factor of 2. The consistency of experimental values of the potential with the exact relation is checked and necessity of large system size is pointed out. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 43 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307599 |
| JaLCDOI | 10.18926/15829 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_17.pdf |
| Author | Akagi Fumio| Osaki Hirokazu| |
| Abstract | Assembly line balancing is to assign work elements to serial work stations so as to make the work content at each station as close as possible to one limiting cycle time or pitch time, i.e., an upper time limit over every station. Until now, it is usually assumed that the performance rates of work stations are constant. But in practice the performance abilities of workers, machines or robots are varied by their own working conditions. Then the actual station times are different from standard ones, and consequently the line balance may diminish in many cases. Therefore in this paper, we propose an improved balancing method, in which work elements can be assigned to the work station having the upper time limit changed by its performance rate or ability. Further we develop the computer program of the proposed method and provide an illustrative problem and computational results. In an application of our method to the practical problems, it is shown that the actual efficiency of the production line becomes near that planned. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 17 |
| End Page | 30 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307409 |
| JaLCDOI | 10.18926/15828 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_2_15.pdf |
| Author | Tanada Yoshihiro| Sano Hiroya| Xu Hai| |
| Abstract | Optical-fiber multi-level PCM transmission system is investigated on the transmission distance and bit rate. A communication channel is established as follows: a light signal is modulated in intensity with a completely-balanced M-Ievel code at a transmitter, and is propagated over an optical glass fiber, and is demodulated at a receiver where the signal with an additive noise is processed through a PD, an equalizing amplifier, a matched filter, (M-l) comparators and a decision circuit. The relative power of the noise from the amplifier is increased in accordance with the reciprocal of fiber's transmittance, where shot noise and thermal noise are smoothed and decreased in power by the matched filter. The relation between the BER and the SNR leads the transmission distance. The product of the transmission distance and bit rate takes the large maximum at the large values of SNR and M. The large value of M is suitable for low-speed and high-rate system, and the interference system. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-06-30 |
| Volume | volume17 |
| Issue | issue2 |
| Start Page | 15 |
| End Page | 29 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307714 |
| JaLCDOI | 10.18926/15827 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_1_1.pdf |
| Author | Funabiki Shigeyuki| Imanaka Akira| Himei Toyoji| |
| Abstract | In the power converter of ac drive system the switching behavior of semiconductors causes the distorted voltage and current waveforms, thus the drive characteristics are affected by them. It is, especially, an essential problem that the distorted current waveforms induce the torque ripple. It is assumed in the previous analysis that the input voltage of inverter is a ripple-free dc one. In industry, however, the input voltage of inverter is gained by rectifying the ac voltage. The torque ripple is caused by not only the behavior of inverter but also the behavior of converter. It is required to develop the analysis taking account of the both behaviors. In this paper, the analysis of brushless-dc motor drive system is proposed taking account of the ac supply, power converter, motor and load. This analytical method is the most suitable one for the analysis of practical system. The effects of factors, e.g. filter constants, inverter frequency, phase relation between ac supply and inverter cycle, load and inertia on the speed variation are revealed by this analysis. Further, the decision of filter constants is discussed from a view of speed variation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-11-15 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 16 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307821 |
| JaLCDOI | 10.18926/15826 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_2_1.pdf |
| Author | Nakanishi Sen-ichiro| Katsuyama Yoshiaki| Himei Toyoji| |
| Abstract | The paper presents the computer aided design (CAD) method, the program, the design and the experimental results of inverse parallel thyristor phase control circuits. The calculated values agree well with the measured. The CAD program contains the next two methods which are inquired carefully by authors, such as (i) the optimization by SUMT (Sequential Unconstrained Minimization Technique) method, and (ii) the combined use of the gradient and the cramp calculation methods. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-06-30 |
| Volume | volume17 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 14 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307323 |
| JaLCDOI | 10.18926/15825 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_2_55.pdf |
| Author | Taniguchi Takeo| Mitsuoka Kazuhiko| Kajitani Eiji| |
| Abstract | In this study a new automatic mesh generator for 2- dimensional finite element analysis is proposed, and its effectivity is surveyed through a number of test examples. Proposed one is for a micro-computer, and the program is written in BASIC. The user needs no preparation for making finite element model in advance. All of the neccessary informations are displayed on CRT display and its user may answer for questions. It is expected that the cost neccessary for preparing the input-data for finite element analysis is largely decreased. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-02-28 |
| Volume | volume20 |
| Issue | issue2 |
| Start Page | 55 |
| End Page | 66 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307353 |
| JaLCDOI | 10.18926/15824 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_1_97.pdf |
| Author | Oda Kiichi| Yoshio Tetsuo| O-oka Kazuo| |
| Abstract | A series of ferroelectric glass-ceramics was elaborated by the controlled growth of Ba(1-x)Sr(x)TiO(3) crystal particles in the glass system 60[Ba(1-y)Sr(y)]TiO(3)-10Al(2)O(3)-30SiO(2)(0≦y≦0.2) in molar basis. Analysis of crystal phases by X-ray diffraction revealed that Sr content in Ba(1-x)Sr(x)TiO(3) increased with increasing content of SrO in glasses by its preferential transfer into the crystal phase, and the appropriate temperature for the crystal growth was 1100°C. Curie temperatures of glass -ceramics shifted to lower temperature with increasing SrO content in the crystal and comparatively high dielectric constant was obtained at room temperature for a glass-ceramics with y=0.2. Frequency dependences of dielectric constant and loss tangent were examined in the frequency range from 1 K to 1 M Hz. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-02-25 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 97 |
| End Page | 105 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307890 |
| JaLCDOI | 10.18926/15823 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_2_47.pdf |
| Author | Inouye Hiroshi| |
| Abstract | When expressway and roads coexist, it is necessary to establish a reasonable traffic share between them. It may be practiced by the regulation of toll-rate of expressway. But at an occasional traffic congestion, the reasonable share is disturbed, so that some traffic control means should be taken. In this paper, we deal how to control inflows on expressway, from a viewpoint of the optimal share between expressway and roads. The minimization of total travel cost in a system is aimed under traffic equilibrium conditions. The problem is formed as a two-stage programming model, and a simple example solving the problem is showed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-02-28 |
| Volume | volume20 |
| Issue | issue2 |
| Start Page | 47 |
| End Page | 53 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307423 |
| JaLCDOI | 10.18926/15822 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_2_35.pdf |
| Author | Nago Hiroshi| Maeno Shiro| |
| Abstract | Under the attack of storm waves, there are many destructions of coastal structures in the forms of sinking and sliding. These types of destructions will be in close relation to the dynamic behavior of sand bed around the structures. From this point of view, in this paper, we investigate the characteristics of the pore water pressure and effective stresses in the highly saturated sand bed under oscillating water pressure theoretically. The results indicate that the oscillating water pressure induce the notable drop of strength of sand bed around the structure under certain condition. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-02-28 |
| Volume | volume20 |
| Issue | issue2 |
| Start Page | 35 |
| End Page | 45 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307664 |
| JaLCDOI | 10.18926/15821 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_1_81.pdf |
| Author | Taniguchi Takeo| Kanei Toshio| |
| Abstract | In this investigation the estimation method of the number of iterations for definite convergence condition by use of the Gauss-Seidel method applied for a set of linear equations which is obtained from the finite element analysis (or the finite difference analysis) of any rectangular area subdivided into N*M is proposed. Though the number of iterations can be obtained by using the eigenvalue of the governing equations, the proposed method does not require the eigenvalue but only the values of Nand M. Numerical experiments on this estimation method clarify that the estimated values are within the error bound of 10%. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-02-25 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 96 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307520 |
| JaLCDOI | 10.18926/15820 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_1_73.pdf |
| Author | Myojin Sho| Ohnishi Masahiko| |
| Abstract | Some extension is made of the previous papers of the same title in order to investigate (1) what aspect consumers' surplus has according to the characteristics of inverse demand curve and (2) where the maximum consumers' surplus is reached in an equilibrium of toll revenues and cost. As for (1) three kinds of inverse demand curves are assumed in general form. The marginal consumers' surplus to expansion of expressway network is proved to be of definite sign (positive or negative) or equal to zero according to each curve assumed. For each of curves, the region where consumers' surplus finds its maximum is also shown on the expressway users ~ network expansion plane. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-02-25 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 73 |
| End Page | 79 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307936 |
| JaLCDOI | 10.18926/15819 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_1_61.pdf |
| Author | Maeno Shiro| Nago Hiroshi| |
| Abstract | In this paper the liquefaction of sand bed under oscillating water pressure are treated as a basic study of the prevention works against the scouring around the hydraulic structures. The results of the former resurch show that the occurrence of the liquefaction depends on both properties of the oscillating water pressure and of the sand layer. Considering the latter properties, that is, the resistivity against the liquefaction increases with the increase of the permeability of the sand bed, we propose the displcement method as one of the prevention works, which is a method to displace the upper layer of the sand bed by the sand with large permeability. The effects of this method are investigated theoretically and experimentally. By the experimental study, it is shown that the proposed displacement method has the apparent effect to prevent the liquefaction. The experimental results are explained fairly well by the theoretical analysis based on the theory of the flow through the elastic porous media. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-02-25 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 71 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| JaLCDOI | 10.18926/15818 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_2_21.pdf |
| Author | Yamada, Masuo| Ohta, Mutsuo| Sakakibara, Akira| |
| Abstract | A series of small-angle X-ray scattering photographs with monochromated and point focussed copper Ka(1) radiation was taken of a single crystal of an Al-4mass % Cu alloy at the as-quenched state from 823K and at successive stages of ageing at 313K. The crystal was so oriented that the incident direction of the radiation was along [001] axis, and was cooled with liquid nitrogen during the exposure. The pattern of the as-quenched state was homogeneous, but each of the patterns of the aged states consisted of streaks along [100] and [010] directions and a quasi-ring around the trace of the incident beam on the film (even at the shortest ageing time. l6sec). The most intense regions were found in [100], [010] , [100] and [010] directions on the ring. With the progress of the ageing the streaks and the ring became more intense and narrower. The results can be interpreted from points of view of the formation of the GP zones parallel to {100} planes ab initio, the effect of the inter-particle interference on scattering of X-rays, and the growth of the GP zones with the ageing. Guinier radius of the GP zones at each stage can be obtained from intensity change along [110], and the values are reasonably consistent with those obtained from the cross section of the streak. The presence of multi-layer zones, besides the one-layer ones, is suggested from the humps found on several intensity curves along [100] at later stages. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-02-28 |
| Volume | volume20 |
| Issue | issue2 |
| Start Page | 21 |
| End Page | 33 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307538 |
