| JaLCDOI | 10.18926/15596 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_1.pdf |
| Author | Honda Kazuo| Konaga Tetsuro| |
| Abstract | Broadly speaking, there are three kinds of approaches to investigate the deformation and fracture of materials, that is, the microscopic (metallurgical), macroscopic(mechanical) and theoretical (mathematical) researches. It is necessary, however, to bridge the gap which persists among of them. Many investigations on the form of plastically deformed zone at a crack tip, the distribution of plastic strain in plastic zone and fracture criterion have been made for the purpose to clarify the mechanism on initiation and propagation of cracks. In this paper, the authors report the studies, from the standpoint of microscopic views, on the crystal deformation at the tip of crac's in notched specimen during fatigue process. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 11 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307236 |
| JaLCDOI | 10.18926/15593 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_133.pdf |
| Author | Misaki Takayoshi| Okamoto Takuji| |
| Abstract | This paper describes a method of hybrid computation for the problems including the function x(n). And the greater part of it is devoted to the considerations of the linkages between the analog and the digital for the function x(n). Here the function x(n) appears frequently in the form of x(2) or x(4) in the industrial problems. As is well known the function x(2) is the characteristic included in fluid-flow problems, and x(4) is in heat-radiation problems. The weak points of analog computation for these characteristics are in accuracy and stability, but can be compensated by making use of digital computer for these parts. In the industrial uses the exclusive digital computer is more convenient than the general-purpose one. Here the relative error of analog computation, the linkages, the number of the digital elements and their relationships are considered at the same time and as the results the reasonable method of hybrid computation is obtained. That is, the exclusive digital multiplier with a compressor and an expandor is found reasonable. Its design considerations are described in details, but it is the basic idea among others that the characteristics of the compressor and the expandor are determined so that the relative error of the signal appearing at the output of the latter may be constant and as the results the necessary and sufficient number of the digital elements may be decreased. And in practice these characteristics are also realized approximately by a group of the straight lines through the origin. Finally the reduced rate of the digital elements and the optimum condition of the approximation are illustrated together with an example. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 133 |
| End Page | 137 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307842 |
| JaLCDOI | 10.18926/15592 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_127.pdf |
| Author | Misaki Takayoshi| Kato Osamu| Yamamoto Hideki| |
| Abstract | Described in this paper is a method of automatic washing for salt contaminated insulators. An average value of leakage current through the surface of the pilot insulator in a duration is measured, for this is a function of the quantity of salt adhered and its moisture content. In each cycle, the program signals give one by one the instructions on a start and an end of the integration of leakage current, a detection of the integrated value, a stop of the washing device and a reset of the integrator. The integrator consists of RC circuit and the main detecting part consists of the thyristor whose firing gate voltage is used as a reference value. If the integrator output rises above the firing gate voltage, the pulse signals are made in the signal conversion part at the same time that the thyristor turns on, which are distributed to the pump motor or the electromagnetic valve. Then the insulators on hot-line are washed all together in the appointed duration. Finally, by the various experiments this method was proved to have enough accuracy and reliability in practical use. The conclusions are summarized as follows. (1) An average value of leakage current is justified to be the detecting variable. (2) The RC circuit used as the integrator is proved to be easy in maintenance. (3) Because of the fairly short duration of the detecting action, the integrator is kept in a sufficiently safe condition under expected environment. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 127 |
| End Page | 132 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307133 |
| JaLCDOI | 10.18926/15591 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_120.pdf |
| Author | Himei Toyoji| Inoue Jyunichi| |
| Abstract | This paper is presented on the operation of the phase controlled single-phase bridge circuit with a free-wheeling diode, which has capacitance in parallel with the inductive load. Such circuit configuration is frequently met with, for instance, at the time when the more smoothness of d-c voltage is required, the higher reliability of SCR's firing is taken into account or load windings include some capacitance which is not negligible. The capacitance influences not only largely upon SCR's rush current but also significantly upon control characteristics of the circuit such as wave forms, pulsating ratio and power factor etc. Here, the various effects of the capacitance on the circuit performance are discussed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 120 |
| End Page | 126 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307335 |
| JaLCDOI | 10.18926/15590 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_111.pdf |
| Author | Nakata Takayoshi| Ishihara Yoshiyuki| |
| Abstract | In this paper, the easy design-method of trasformer tank is described. Using nomographs induced here, the bending moments on the oval tank or round cornered rectangular tank which is used for usual transformer, are briefly calculated. And the relation between the type of transformer and the distribution of bending moment is cleared. Using these results, even electric engineer who has poor knowledge for strength of materials, can easily design a most suitable tank. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 111 |
| End Page | 119 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307797 |
| JaLCDOI | 10.18926/15588 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_96.pdf |
| Author | Mine Tadao| Yamamoto Tatuma| Baba Yukinobu| Yamamoto Yositake| |
| Abstract | In the preceding paper a new method of analyzing nonlinear periodic oscillations was proposed. In this article a new conception, which is named as the extended harmonic approximation of nonlinear oscillatory circuits, is presented. Method of obtaining transient solutions by the conception is given and various numerical examples are shown. The new conception has merits that a consistent linearization method is given for both steady state and transient state domains and transient solutions are obtained simply. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 96 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307313 |
| JaLCDOI | 10.18926/15587 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_93.pdf |
| Author | Moriwake Tosio| |
| Abstract | The Reformatsky reaction with t-butyl haloacetate could be effected in the presence of lithium or aluminum, but the latter metal proved to be disappointing as a condensing agent. Condensation of benzophenone with t-butyl chloroacetate and bromoacetate in the presence of lithium gave corresponding β-hydroxy esters in yields of 43 and 58%, respectively, and comparable with those of other condensing methods. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 93 |
| End Page | 95 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307573 |
| JaLCDOI | 10.18926/15586 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_88.pdf |
| Author | Monobe Kazuo| Fujiwara Yasuo| |
| Abstract | Single crystals of two crystatalline forms, α and γ, in nylon 12 were obtained from dilute solutions. The single crystals of γ-form from diols solutions are ribbon like lamellae in shape, and that of α-form obtained from solution in water-formic acid are parallelogramic. Electron diffraction study shows that chain packings in single crystals of two crystalline forms are very similar to those of nylon 6, respectively |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 88 |
| End Page | 92 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307315 |
| JaLCDOI | 10.18926/15585 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_84.pdf |
| Author | Monobe Kazuo| Yamashita Yuhiko| |
| Abstract | The preparative method of giant single crystals of PEO and the experimental results of them by x-ray diffraction and electron microscopy are described. The crystallization of PEO was carried out in a two dimensional crystallization apparatus. From the tridirectional x-ray diffraction patterns on the resulting platelike crystals, it was confirmed that these crystals have a single crystal-like orientation at high supercoolings, the [401] axis is parallel to a growing direction and the [001] axis is perpendicular to the wide surface, and a double orientation at low supercoolings, two axes of [421] and [421] are parallel to a growing direction and the [001] axis is perpendicular to the wide surface. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 84 |
| End Page | 87 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307197 |
| JaLCDOI | 10.18926/15583 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_80.pdf |
| Author | Takeda Akira| Wada Satosi| Uno Takaaki| |
| Abstract | The condensation of ethyl chloroarylpyruvate (Ⅰ) with ethyl malonate in the presence of sodium ethoxide afforded γ-aryl-α,β-dicarbethoxy-⊿(β),γ-butenolide. On the basis of the chemical and spectral evidences, the structure of the product (II) has been elucidated. This reaction provides new routes to α,β-dicarboalkoxy-γ-butyrolactones and/or to γ-ketocarboxylic acids. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 80 |
| End Page | 83 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307243 |
| JaLCDOI | 10.18926/15582 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_74.pdf |
| Author | Takeda Akira| Kariya Yosihiro| Torii Sigeru| |
| Abstract | The ring opening of epoxide group in the reaction of ethyl ,β-alkylglycidates with sodiomalonate was observed mostly at the α-position of the glycidates. Ethyl β-ethylglycidate, however, on treatment with sodiomalonate gave ten percent of β-fission product, elucidated by NMR spectra. The reaction sequence provides a general preparative route to γ-alkylparaconic acids and their derivatives. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 74 |
| End Page | 79 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307843 |
| JaLCDOI | 10.18926/15580 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_68.pdf |
| Author | Takeda Akira| Nagae Hiroyuki| Torii Sigeru| |
| Abstract | The reaction of ethyl γ,γ-dialkylparaconate with aromatic aldehydes, i.e., benzaldehyde, anisaldehyde, p-chlorobenzaldehyde, and piperonal, has been investigated. The condensation took place at the α-position of the lactone ring. As the acidic components, α-benzylideneparaconic acids and α-benzylidene-β-alkylidensuccinic acids were obtained in 25-48% and 7-15% yields, respectively. From the neutral portions small amount of ethyl benzylideneparaconates were separated. During the course of distillation ethyl α-benzylideneparaconate was partially converted into α-benzylidene-γ-methy-γ-ethylbutyrolactone. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 68 |
| End Page | 73 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307999 |
| JaLCDOI | 10.18926/15579 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_62.pdf |
| Author | Hirai Taketsugu| Miura Yoshinari| Yoshio Tetsuo| Takahashi Katsuaki| |
| Abstract | Decomposition voltages of Na(2)O (30-50 mole % )-SiO(2) binary system were estimated at the temperature range of 700~1200℃ by commutator technique. As the experimental procedure, relations between electrolytic current and resulting polarization potential without ohmic loss were observed by 20 cps mechanical commutator, using Pt|Na(2)O-SiO(2)|Pt electrochemical system. Experimental decomposition voltages determined from above relationship were the value of 1.5~2.0 V at the temperature beyond about 800℃ with comparatively less reproducibility. Further investigations on the decomposition reaction mechanisms were made in reference to both a series of reversible decomposition voltages derived from thermodynamic calculations on the several proposed decomposition reactions and chemical equilibrium in vitreous silicates. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 62 |
| End Page | 67 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307847 |
| JaLCDOI | 10.18926/15578 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_55.pdf |
| Author | Takahashi Katsuaki| Yoshio Tetsuo| Miura Yoshinari| Hirai Taketsugu| |
| Abstract | The method for continuous measurement of the high temperature heat content, developed by W.Oelsen et al. and applied to the glasses by M.Tashiro, was examined and modified in some points. Relations between the temperature and heat contents referred to the standard temperature 25℃, were determined for the some glasses of R(2)O-SiO(2) system, and the specific heats as well as the entropies were calculated. Comparing the results, some views have been obtained relating to the effect of the species and content of alkali ions on the thermodynamic quantities of such glasses. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 55 |
| End Page | 61 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307355 |
| JaLCDOI | 10.18926/15577 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_50.pdf |
| Author | Takahashi Teruo| Akagi Yasuharu| |
| Abstract | Recently various trays in which mass transfer operations are carried out have been developed, and the authors have designed one of the rotational-current tray which is designed to direct flow of ascending gas horizontally across the tray surface. In this report, as a fundamental study for mass transfer on this tray, flow mechanism and liquid holdup on the tray are considered experimentally. Experiments are carried out by water-air, methanol-water air and gricerinewater-air systems. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 50 |
| End Page | 54 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307498 |
| JaLCDOI | 10.18926/15575 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_43.pdf |
| Author | Takahashi Teruo| Fujita Kozo| |
| Abstract | In this report, the analogies of the maximum allowable liquid and gas velocities in various countercurrent gas-liquid contactors of column type are considered analytically. That is, by plotting the flooding points of various columns in a gas-liquid separated coordinates, the similar curves have been obtained in each column. Because the difference of these curves is due to the shape of each column, the difference of each shape must be corrected and evaluated as a ahape factor. Then, by containing this factor in coordinate variables, various flooding points in each column may be correlated by a single curve. If this correlation curve is used, the flooding velocity can be estimated easily, and the maximum allowable liquid and gas velocities in these countercurrent contactors of column type can be compared. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 43 |
| End Page | 49 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307818 |
| JaLCDOI | 10.18926/15574 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_39.pdf |
| Author | Ohta Mutsuo| Hashimoto Fumio| Tanimoto Tadashi| |
| Abstract | Binding energies between a vacancy and an atom of lead or gold were measured with the same method as those previously reported. The solid solubility of lead or gold in aluminium is very small, and the small quantity of precipitates are found along grain boundaries in this experiment. Therefore, it was not possible to determine the value of binding energy, but the lower limit of binding energy was estimated. The values of lower limit for Pb-Vacancy and Au-Vacancy binding energy were 0.38 eV and 0.35 eV, respectively. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 42 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307777 |
| JaLCDOI | 10.18926/15573 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_35.pdf |
| Author | Wada Tsutomu| Ohgishi Shinji| |
| Abstract | An analysis is attempted of the human operator's responses to the sinusoidal input and the random input. The human operator's characteristics in the closed loop system are represented by the Bode diagram. This diagram shows that the human operator's response to the random input containing only those frequency components lower than 4 rad/s is almost in accordance with his response to the siunsoidal input of the same frequency range. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 35 |
| End Page | 38 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307455 |
| JaLCDOI | 10.18926/15571 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_30.pdf |
| Author | Sayama Hayatoshi| Oi ko| |
| Abstract | The optimum temperature in a sequence of two stirred tanks is considered subject to inequality constraints. For an illustrative example this nonlinear programming problem is solved using the SUMT method of Fiacco and McCormick, which transforms the constrained problem into a sequence of unconstrained minimization problems. The results are presented for several cases, and are fairly good. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 30 |
| End Page | 34 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307563 |
| JaLCDOI | 10.18926/15570 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_2_26.pdf |
| Author | Osaki Hirokazu| Kikuchi Susumu| Matsuda Akira| |
| Abstract | There are a number of methods for measuring the fatigue because the measurement of this in the working hours is useful for analyzing the factors of fatigue and for the utilization of the labor management. In this paper, the fatigue of bus drivers who have experience of various number of years in some bus company is measured by the flicker and these values are analyzed by X(2) test or sign test and its control limit is determined. These are contributed to find a daily variation and to estimate the fatigue capacity, the degree of skill and what factors have influence on points which oversteps the limit line. It was found in this study that the limit line gets lower as the year of experience increases and the flicker values decrease in the forenoon. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1967-04-01 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 26 |
| End Page | 29 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307166 |
