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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
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 英語
File Version publisher
NAID 120002307166
JaLCDOI 10.18926/15568
FullText URL Mem_Sch_Eng_OU_2_23.pdf
Author Yoshii Tensho| Kikuchi Susumu|
Abstract The problem of the optimal assignment of facilities to locaticns has been solved by J.W. Gavett and Normann V.Plyter. In their paper the branch and bound technique is used and for this purpose the distance matrix is transformed into the matrix whose diagonal compoents are zero. The purpose of this paper is to avoid such a transformation and the store of the distance matrix into the computer.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1967-04-01
Volume volume2
Issue issue1
Start Page 23
End Page 25
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307907