検索結果 24398 件
| 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 | 10.18926/15823 |
|---|---|
| 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 | 10.18926/15818 |
|---|---|
| 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 | 10.18926/15816 |
|---|---|
| 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 | 10.18926/15812 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_2_75.pdf |
| 著者 | Okamoto Takuji| |
| 抄録 | Some modifications of an asynchronous ring arbiter are proposed. This arbiter is composed of a chain of cells. Each cell has one to one correspondence to a device. In the chain, there exists only one privilege to arbitrate conflicts of requests from many devices. A class of modifications is high speed arbiters, obtained by increasing the number of connecting wires between two adjacent cells. As the results, the time required for the privilege to pass through a cell decreases by about one-half compared with the original arbiter. Another class of modifications is arbiters with priority rules. They are obtained by adding a few hardware to the original arbiter. The priority order of request acknowledgements in all the cells is specified. Using above modifications, conflicts of requests in many digital systems may be feasibly arbitrated. |
| 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 | 75 |
| 終了ページ | 87 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307859 |
| JaLCDOI | 10.18926/15811 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_20_1_45.pdf |
| 著者 | Korenaga Takashi| Moriwake Tosio| Takahashi Teruo| |
| 抄録 | A simple system was developed for the fully automatic and continuous measurement of chemical oxygen demand (COD) in wastewater samples based on colorimetry of dichromate. A sample and a solution of sulfuric acid (1+1) containing 2mM potassium dichromate are continuously pumped with a double-reciprocating micro-pump at each flow rate of 0.3 ml/min. The wastewater sample is filtered at first with a 100-mesh stainless filter and then mixed with the dichromate solution in the mixing joint. The mixture is introduced into a reaction coil made of poly(tetrafluoroethylene) tubing (1 mm i.d., 3 mm o.d., and 20 m length), being placed in an oil bath (120℃). After reaction, the mixture passes into a quartz tubular flow-through cell (10 mm path length, 18 μl volume) in a spectrophotometer, and the absorbance is measured at 445 nm. The COD value of the sample is automatically estimated from the amount of decreased absorbance. The system was successfully applied to COD measurement of some waters, and to continuous monitoring of COD in wastewater of university laboratories. The system was also evaluated by comparing with the flow injection analyzer system previously developed by the authors. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1985-11-08 |
| 巻 | 20巻 |
| 号 | 1号 |
| 開始ページ | 45 |
| 終了ページ | 52 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307695 |
| JaLCDOI | 10.18926/15810 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_2_59.pdf |
| 著者 | Hida M.| Maeda H.| Tanabe K.| Kamijo N.| Terauchi H.| |
| 抄録 | The EXAFS spectroscopy equipment constructed from an asymmetrical cut flat monochromator and PSPC is applied to the structural determination of pure α-iron which has small difference (0.038nm) in the first and second nearest neighbour distance. The efficiency of the curve fitting method for the two shell model of known structure material (α-iron) is discussed, in addition to describing the details of the experimental procedure of our new type of spectrometer and of the EXAFS data analysis. |
| 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 | 59 |
| 終了ページ | 74 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307651 |
| JaLCDOI | 10.18926/15806 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_2_17.pdf |
| 著者 | Himei Toyoji| Nakanishi Sen-ichiro| Funabiki Shigeyuki| |
| 抄録 | The phase control characteristics in a thyristor phase control circuit with parallel resonance elements indicate very interesting phenomenon. Several extreme values appear on the phase control curve. The phenomenon is different from the step-up one in a thyristor phase control circuit with series RLC elements which is interpreted as series resonance. To comprehend the circuit performance with those loads, it is necessary that the phenomenon on extreme value is physically clarified from other viewpoints. In this paper the performance in this circuit is studied from two viewpoints of a natural oscillation and a parallel resonance. Then, it is found that the performance depends on a natural frequency in thyristor conducting period and a parallel resonance frequency in thyristor non-conducting period. Therefore, the interesting phenomenon on extreme value is affected by the alternative of natural frequency or parallel resonance frequency. |
| 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 | 17 |
| 終了ページ | 29 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307189 |
| JaLCDOI | 10.18926/15804 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_2_1.pdf |
| 著者 | Yokoyama Fumiyoshi| |
| 抄録 | A deconvolution method for the X-ray diffraction line profile is proposed, which is based on the conventional least-squares method. The true profile is assumed to be a functional form. The numerical values of parameters of the function assumed are determined so that the calculated profile, which is a convolution of the function and the instrumental profile, has a minimum deviation from the observed one. The method is illustrated by analysis of the X-ray powder diffraction profile of sodium chloride 222 reflexion under the assumption that the true profile is a Gaussian or a Cauchy function. |
| 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 | 1 |
| 終了ページ | 16 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307445 |
| JaLCDOI | 10.18926/15801 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_1_125.pdf |
| 著者 | Inouye Hiroshi| Oda Shinji| |
| 抄録 | A system dynamics model to forecast future movements of a city was studied. The model consists of three sections of population sector, industry sector, land use sector and some divisions of labor, income employment, housing land which connect each sections. Economic growth rate, public investment program, housing land supply program were incorporated in the model as political variables. The model was applied to Okayama city for thirty years from 1975 to 2005. The results of the simulation are summarized as follows: 1) The drift of peoples into Okayama city will advance in the future. 2) Tertiary industries will be given much weight as compared with secondary industries. 3) Because of the drift of peoples, housing problems will be serious in the future. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1982-03-01 |
| 巻 | 16巻 |
| 号 | 1号 |
| 開始ページ | 125 |
| 終了ページ | 145 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308014 |
| JaLCDOI | 10.18926/15800 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_2_49.pdf |
| 著者 | Yamamoto Kyoji| |
| 抄録 | A Galerkin method is applied to a singular integral equation of fredholm type originated in the problem of the rarefied gas flow over a plane wall. The solution is expanded in a series of the Abramowitz function. The numerical calculations were carried out up to ten-terms expansions. The results show a good convergence of the series.The comparison is made with the previous work obtained by the moment method. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1985-02-25 |
| 巻 | 19巻 |
| 号 | 2号 |
| 開始ページ | 49 |
| 終了ページ | 61 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307308 |
| JaLCDOI | 10.18926/15799 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_1_105.pdf |
| 著者 | Myojin Sho| Asai Kazuhiko| |
| 抄録 | A welfare economic approach is tried to an optimal decision of toll rate and expansion of urban expressway network in an equilibrium of toll revenues and cost of service supplied. The model, originated with Yamada, is such that the decision comes into optimality when the maximum consumers' surplus is reached in the equilibrium condition. The paper is concerned with some general aspects of the optimal solution and reexamination of the solution obtained in the past when used a specific demand curve. General aspects obtained are as follows; The extremum condition to consumers' surplus is equivalent to that to diverted traffic (the realized number of expressway users) only when demand curve has such a property that the marginal consumers' surplus to network expansion vanishes. In case that the marginal consumers' surplus does not vanish, the extrema of consumers' surplus is found in the regions of negative marginal diverted traffic if demand curve yields positive marginal surplus, and in the regions of the positive if it gives negative marginal surplus. The contact points of demand and average cost curves give extrema of neither consumers' surplus nor diverted traffic. An implicative finding, made out by Yamada by using a specific demand curve, that optimal network expansion is reached when the marginal service cost to expansion averaged to the marginal diverted traffic to expansion is equal to the value of time saved by using expressway just by mean trip length holds good at the points of the maximum diverted traffic, but not at the contacts of demand and average cost curves. In case of the demand curve, the condition for an equilibrium of revenues and cost to come into existence is that the minimum of the ratio of service cost averaged to the whole population of expressway users to the value of time mentioned above is less than or equal to e(-1). |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1982-03-01 |
| 巻 | 16巻 |
| 号 | 1号 |
| 開始ページ | 105 |
| 終了ページ | 123 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307932 |
| JaLCDOI | 10.18926/15798 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_2_33.pdf |
| 著者 | Taniguchi Takeo| Mitsuoka Kazuhiko| Terada Takashi| |
| 抄録 | This paper treats the convergence condition of the explicit finite element method (i.e. the time and spatial axes are discretized by using the explicit finite difference method and the weighted residual method, respectively) which is applied for analyzing the heat problem in region with complex boundary configuration and also with several material properties. The main role of this study is the application of the Brauer's theorem. As the results we obtain that the usage of the Brauer's theorem is valid and that the application method of the theorem is presented in this paper. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1985-02-25 |
| 巻 | 19巻 |
| 号 | 2号 |
| 開始ページ | 33 |
| 終了ページ | 48 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307201 |
| JaLCDOI | 10.18926/15797 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_1_91.pdf |
| 著者 | Nago Hiroshi| |
| 抄録 | In this paper the vertical distribution of pore water pressure in the highly saturated sand layer under the oscillating water pressure are treated theoretically and experimentally. By the experiments it is shown that the water pressure acting on the sand surface propagates into the sand layer with the damping in amplitude and the lag in phase, and that the liquefaction, the state that the effective stress becomes zero, occurs under certain conditions. These experimental results are explained fairly well by the same theoretical treatment as for the ground water problems in the elastic aquifer. The main characteristics of liquefaction clarified by the analysis are as follows. 1) The depth of the liquified layer increases with the increase of the amplitude and the frequency of the oscillating water pressure. 2) The increase of the volume of the water and the air in the layer increases the liquified depth. Especially the very small amount of the air affects the liquefaction significantly. 3) The liquified depth decrease rapidly with the increase of the compressibility coefficient of the sand. 4) In the range beyond a certain value of the permeability coefficient the liquified depth decrease with the increase of the coefficient. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1982-03-01 |
| 巻 | 16巻 |
| 号 | 1号 |
| 開始ページ | 91 |
| 終了ページ | 104 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307671 |
| JaLCDOI | 10.18926/15796 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_2_23.pdf |
| 著者 | Myojin Sho| Kishino Keiichi| |
| 抄録 | A welfare economic approach is applied to investigate some implications of optimal pricing in urban expressway where two different groups of users are supposed to exist. On the assumption of a specified demand function, following implications are shown; (1) optimal prices must be such that the diversion ratios are the same and (2) the price rates must be set equal each other, where the price rate means the proportion of the price to the average user benefit. In connection with the results, the elasticity of the demand with respect to price is measured in Osaka area of Hanshin Expressway, where two different levels of price are flatly set for users according to the characteristics of their cars. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1985-02-25 |
| 巻 | 19巻 |
| 号 | 2号 |
| 開始ページ | 23 |
| 終了ページ | 32 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307638 |
| JaLCDOI | 10.18926/15795 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_1_65.pdf |
| 著者 | Kohno Iichiro| Nishigaki Makoto| |
| 抄録 | The purposes of this research is an investigation of the intrusion of sea water into coastal aquifers. For this subject, this paper deals with proposing rational methods of getting diffusion coefficient and dispersion parameter for flow in porous media in a laboratory. These parameters of soil are indispensable in order to apply an analytical approach or a numerical approach to actual salt water intrusion problems. Experimental apparatuses were constructed and test procedures were also developed to measure concentration behaviors in a saturated porous media by using electro conductivity probe. As the results, the diffusion coefficients for the Toyoura standard sand and the Asahi river sand determined by two methods, that is, "Boltzman's transformation method" and "Instantaneous profile analysis method". The longitudinal coefficient of dispersion for one-dimensional flow was also determined by the least squares curve fitting method with a function of a certain range of seepage velocity. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1982-03-01 |
| 巻 | 16巻 |
| 号 | 1号 |
| 開始ページ | 65 |
| 終了ページ | 89 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307205 |
| JaLCDOI | 10.18926/15794 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_2_13.pdf |
| 著者 | 古賀 隆治| Kosaka, Megumi| Sano, Hiroya| |
| 抄録 | A quasi-random method for spectral scanning is proposed to reduce an alias response to a quick change in the source abundance. A direct application is made for an atmospheric methane monitoring with a current-tunable diode laser. Only barrel shift methods are examined being found further vulnerable to drifting etalon fringes. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1985-02-25 |
| 巻 | 19巻 |
| 号 | 2号 |
| 開始ページ | 13 |
| 終了ページ | 22 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308000 |