検索結果 47919 件
| JaLCDOI | 10.18926/15832 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_1_57.pdf |
| 著者 | Sakata Kenji| Kohno Iichiro| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-11-15 |
| 巻 | 21巻 |
| 号 | 1号 |
| 開始ページ | 57 |
| 終了ページ | 70 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307146 |
| JaLCDOI | 10.18926/15831 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_1_45.pdf |
| 著者 | Totsuji Hiroo| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-11-15 |
| 巻 | 21巻 |
| 号 | 1号 |
| 開始ページ | 45 |
| 終了ページ | 55 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307995 |
| JaLCDOI | 10.18926/15830 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_1_31.pdf |
| 著者 | Totsuji Hiroo| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-11-15 |
| 巻 | 21巻 |
| 号 | 1号 |
| 開始ページ | 31 |
| 終了ページ | 43 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307599 |
| JaLCDOI | 10.18926/15829 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_1_17.pdf |
| 著者 | Akagi Fumio| Osaki Hirokazu| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-11-15 |
| 巻 | 21巻 |
| 号 | 1号 |
| 開始ページ | 17 |
| 終了ページ | 30 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307409 |
| JaLCDOI | 10.18926/15828 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_2_15.pdf |
| 著者 | Tanada Yoshihiro| Sano Hiroya| Xu Hai| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-06-30 |
| 巻 | 17巻 |
| 号 | 2号 |
| 開始ページ | 15 |
| 終了ページ | 29 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307714 |
| JaLCDOI | 10.18926/15827 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_1_1.pdf |
| 著者 | Funabiki Shigeyuki| Imanaka Akira| Himei Toyoji| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-11-15 |
| 巻 | 21巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 16 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307821 |
| JaLCDOI | 10.18926/15826 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_2_1.pdf |
| 著者 | Nakanishi Sen-ichiro| Katsuyama Yoshiaki| Himei Toyoji| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-06-30 |
| 巻 | 17巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 14 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307323 |
| JaLCDOI | 10.18926/15825 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_20_2_55.pdf |
| 著者 | Taniguchi Takeo| Mitsuoka Kazuhiko| Kajitani Eiji| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-02-28 |
| 巻 | 20巻 |
| 号 | 2号 |
| 開始ページ | 55 |
| 終了ページ | 66 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307353 |
| JaLCDOI | 10.18926/15824 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_97.pdf |
| 著者 | Oda Kiichi| Yoshio Tetsuo| O-oka Kazuo| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 97 |
| 終了ページ | 105 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307890 |
| JaLCDOI | 10.18926/15823 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_20_2_47.pdf |
| 著者 | Inouye Hiroshi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-02-28 |
| 巻 | 20巻 |
| 号 | 2号 |
| 開始ページ | 47 |
| 終了ページ | 53 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307423 |
| JaLCDOI | 10.18926/15822 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_20_2_35.pdf |
| 著者 | Nago Hiroshi| Maeno Shiro| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-02-28 |
| 巻 | 20巻 |
| 号 | 2号 |
| 開始ページ | 35 |
| 終了ページ | 45 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307664 |
| JaLCDOI | 10.18926/15821 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_81.pdf |
| 著者 | Taniguchi Takeo| Kanei Toshio| |
| 抄録 | 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%. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 81 |
| 終了ページ | 96 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307520 |
| JaLCDOI | 10.18926/15820 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_73.pdf |
| 著者 | Myojin Sho| Ohnishi Masahiko| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 73 |
| 終了ページ | 79 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307936 |
| JaLCDOI | 10.18926/15819 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_61.pdf |
| 著者 | Maeno Shiro| Nago Hiroshi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 61 |
| 終了ページ | 71 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| JaLCDOI | 10.18926/15818 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_20_2_21.pdf |
| 著者 | Yamada, Masuo| Ohta, Mutsuo| 榊原 精| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-02-28 |
| 巻 | 20巻 |
| 号 | 2号 |
| 開始ページ | 21 |
| 終了ページ | 33 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307538 |
| JaLCDOI | 10.18926/15817 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_41.pdf |
| 著者 | Mori Chuji| Hattori Susumu| Hamate Shinya| |
| 抄録 | The algorithm of automatic stereo plotting by iterative image correlation from aerial photographs and the corresponding empirical tests are described. The algorithm is oriented to off-line process, using a image scanner and a general purpose computer, and consists of 3 hierarchical correlation steps, based on one-dimensional matching using usual correlation maximum. For the correlation calculation, the FFT is effectively used. Though some defects exist in the algorithm at present, close contour plotting to middle scale maps is available except in hilly regions, in which marked features in ground covers do not exist. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 41 |
| 終了ページ | 60 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307285 |
| JaLCDOI | 10.18926/15816 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_15.pdf |
| 著者 | Himei Toyoji| Nakanishi Sen-ichiro| Funabiki Shigeyuki| Komatsubara Hitoshi| Kurose Osamu| |
| 抄録 | An ac phase control circuit by thyristor is widely used in industry, The characteristics of the singlephase circuit with series RLC elements are numerically analyzed, and is reported the interesting phenomenon of step-up voltage without transformer. However, the performance of three phase phase control circuit with series RLC elements is not made clear. In this paper, the performance of three-phase control circuit of a balanced and an unbalanced load with series RLC elements is described. The analytical programs with each load are developed, and it is clarified that the calculated by this analytical program agree well with the measured. The calculated results, e.g. waveforms, RMS values of voltage and current, power, and power factor are illustrated and discussed the step-up phenomenon in three phase. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 15 |
| 終了ページ | 40 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307185 |
| JaLCDOI | 10.18926/15815 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_20_2_1.pdf |
| 著者 | Miyahara Toshiro| Takahashi Teruo| |
| 抄録 | Bubble columns are extensively used in the chemical industry. This paper evaluates the present state of the art on the size of bubbles from a sieve plate and gas holdup, mainly on the basis of the results of the authors, including previous ones. The size of bubbles formed from a sieve plate has an insignificant effect of chamber volume, and gas holdup shows some different behavior, depending on the hole diameter to liquid depth. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1986-02-28 |
| 巻 | 20巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 20 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307288 |
| JaLCDOI | 10.18926/15814 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_17_1_1.pdf |
| 著者 | Takahashi Teruo| Miyahara Toshiro| |
| 抄録 | This paper deals with the comparison of gas-liquid holdup and froth height on a perforated plate under various operational conditions such as liquid stagnant, cocurrent, countercurrent and crosscurrent gas-liquid flow system. Tendency to foam is remarkable in countercurrent and crosscurrent flow system. The crosscurrent flow system is suitable for the operation of mass transfer from the point of view of gas-liquid holdup. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1983-02-25 |
| 巻 | 17巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 13 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307710 |
| JaLCDOI | 10.18926/15813 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_2_89.pdf |
| 著者 | Kohno Iichiro| Nishigaki Makoto| |
| 抄録 | In this paper are described on the finite element analysis of the nonsteady behavior of interface between salt- and freshwater in coastal groundwater. In order to investigate the validity and the accuracy of this numerical analysis solution, the results calculated by this finite element analysis have been compared with the laboratory model tests. The numerical results showed the very good agreement with the experimental data. Moreover, some applications of this analytical method have been performed. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1982-03-29 |
| 巻 | 16巻 |
| 号 | 2号 |
| 開始ページ | 89 |
| 終了ページ | 99 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307453 |