result 8441 件
| JaLCDOI | 10.18926/15673 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_4_57.pdf |
| Author | Takahashi Teruo| Kitamura Yoshiro| |
| Abstract | Although the stability of Newtonian liquid jet has been investigated experimentally and theoretically, many problems has remained unsolved. Especially, the stability of liquid jets in immiscible liquid systems has been little studied. Furthermore, one has to point out that the stability of jets may be influenced by the turbulence in the nozzle and the velocity profile. This work presents the experimental result about the effect of the nozzle length on the breakup length of liquid jets in the air and in the immiscible liquid, as the beginning of a systematic investigation of the influence by these factors on the breakup of jet. The dependence of the initial amplitude of surface disturbances on the nozzle geometry is presented for evaluating the effect of the nozzle length on the breakup length of laminar liquid jet in the air and in the immiscible liquid. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1969-09-01 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 57 |
| End Page | 64 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307482 |
| JaLCDOI | 10.18926/15659 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_8_2_44.pdf |
| Author | Hirose Koji| Nobunaka Masayuki| |
| Abstract | In this study, the friction factors of oscillating pipe flows are experimentally investigated. As the oscillating pipe flow, the pendulation of water column in the special vertical U-tube, which has about the 2 m long horizontal straight foot pipe, is utilized. The results of experiments show that the momentary friction factors in the accelerating state are smaller and in the decelerating state are larger than that in steady state for each Reynolds numbers. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1973-12-26 |
| Volume | volume8 |
| Issue | issue2 |
| Start Page | 44 |
| End Page | 51 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307703 |
| JaLCDOI | 10.18926/15655 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_8_1_1.pdf |
| Author | Nakata Takayoshi| Ishihara Yoshiyuki| Nakano Masanori| |
| Abstract | When the distorted flux is induced in a magnetic circuit, the minor loops arise sometimes inside the major hysteresis loop. The area, accordingly the hysteresis loss of the minor loop,is affected by its amplitude and position, by the maximum flux density, by the quality of material, etc.. In this paper, we describe the experimental studies of the factors on the minor loop hysteresis loss. A method of getting the displacement factor of a minor loop which is placed at arbitrary position and has any amplitude is developed from our experimental results. Using this method, the core losses caused by the distorted flux can be calcuLated within the error less than three percent, even if the amplitude of the minor loop becomes near to the amplitude of the major loop. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1973-07-20 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 14 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307897 |
| JaLCDOI | 10.18926/15635 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_4_35.pdf |
| Author | Kaneda Yasuhiro| Osaki Hirokazu| Kikuchi Susumu| |
| Abstract | Insuring fast and precise human operation is one of the engineering requirements in the developing civilization. Some man-machine system, when any operator is exposed himself to some kind of vibration, he may not perform his operation in good conditions. Then one of the interferring factors, there is a fatigue caused by vibration. In this study, subjects sit on the chair which was set on the vibration table, and were shaken vertically for some given times, then were measured whether the fatigue occured or not by flicker friction tester. Flicker patterns were analyzed according to each vibration-condition, then the authors knew that the fatigue was occured by vibration. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1969-09-01 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 35 |
| End Page | 38 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002308023 |
| JaLCDOI | 10.18926/15632 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_6_13.pdf |
| Author | Osaki Hirokazu| Kikuchi Susumu| |
| Abstract | The equipment measuring the critical flicker fusion frequency (CFF) is made in order to measure many subjects' CFF at the same time. This equipment is defined the multi-flicker. The equipment measuring CFF, used until now is defined the mono-flicker. It is analysed what factors influence CFF strongly. Then it is made clear that CFF value measured by the multi-f1icker can be used to show the brain weariness as well as that of the mono-flicker, and the vigual angle and the intensity of illumination in the room influence CFF value strongly. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1971-09-01 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 19 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307387 |
| JaLCDOI | 10.18926/15630 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_6_7.pdf |
| Author | Hirose Koji| Oka Takuma| |
| Abstract | A series of turbulent pipe flow experiments with dilute aqueous C.M.C. solutions are described. The purpose of these experiments are to compare the anomalous viscous drag results from these experiments with the results using water (Newtonian viscous fluid). The additive concentrations of the present experiments are from 0.01% to 0.5% by weight of C.M.C., giving power-law indexes 1 to 0.75, respectively. All of the concentrations are found to give a reduction in turbulent friction factor, compared with Newtonian at the same Reynolds number. A maximum friction factor reduction of 64 % is obtained at a Reynolds number 2x10(3) for solutions having polymer concentration of 0.3% by weight. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1971-09-01 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 12 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307497 |
| JaLCDOI | 10.18926/15628 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_4_9.pdf |
| Author | Hirose Koji| Oka Takuma| |
| Abstract | In this study, the friction factors of unsteady pipe flows have been experimentally investigated. The normal temperature water was used as working fluid and pulsating flow superposed on the steady turblent flow, having the variation of velocity approximately represented by sine curve, was used. In the result, the time mean friction factors of the unsteady flow agree with that of steady flow, and the momentary friction factors in the accelerating state are smaller and in the decelerating state larger than that in steady flow for each Reynolds numbers. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1969-09-01 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 9 |
| End Page | 12 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307589 |
| JaLCDOI | 10.18926/15605 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_51.pdf |
| Author | Takahashi Teruo| Akagi Yasuharu| |
| Abstract | The liquid phase mass transfer resistance in the Rotational-current tray is one of the most important factors in its design and performance. In this report, the holding time of liquid on the tray was studied experimentally by water-air system, and then the desorption tests were carried out by water-oxygen-air system that the liquid phase resistance were controlling. From the results of these experiments, it was found that the gas flow rate and the holding time of liquid on the tray control the tray efficiency strongly. Thus, the experimental equation for the number of transfer units based on liquid phase was derived. And also, it was found that this type of tray can be operated at high efficiency with a higher gas rate than the Kittel tray and the sieve tray without downcomer. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 51 |
| End Page | 56 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307343 |
| 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 | 10.18926/15575 |
|---|---|
| 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 | 10.18926/15570 |
|---|---|
| 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 |
| JaLCDOI | 10.18926/15556 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_1_116.pdf |
| Author | Takamatsu Takeichiro| Sayama Hayatoshi| |
| Abstract | The identification or model building of system is the important problem for the dynamic optimization of chemical plant and it is desired that this mathematical model can be determined as quickly and as exactly as possible from experimental or operating data. Recently the identification of linear system has been studied, but there have been few papers on nonlinear systems. Especially, no approaches can be found to identify effectively a chemical reaction process which is a nonlinear and nonisothermal system. Except for the case in which the linearized model is enough to represent the approximate dynamic behaviour of the plant, system should be directly represented by nonlinear mathematical model in general. In this paper, the gradient method was applied to identify a nonlinear system. In this method, the parameters to be chosen optimally are regarded as timeinvariant control variables and they are numerically determined by using a high speed digital computer (KDC-I). As a numerical example, we choose a continuous stirred tank reactor with the first order exothermic reaction and show the procedure to determine the three parameters, that is, the order of reaction, the values of activation energy and frequency factor. It should be emphasized that this approach makes it possible to construct the mathematical model of nonisothermal chemical reaction processes only from input and output data. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1966-03-31 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 116 |
| End Page | 119 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307194 |
| JaLCDOI | 10.18926/15553 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_1_98.pdf |
| Author | Kikuchi Susumu| Tomiya Nobuaki| |
| Abstract | Demand and supply of service are complicatedly related with the balance between fixed capital and circulating capital, movement to the left or right side from a break-even point, and other factors. If there is the disproportion between demand and supply of service, the waiting line to take a service will vary, and in some cases, fixed equipment will not be employed effectively. This report presents trial manufacture of the experimental equipment for waiting line problems. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1966-03-31 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 98 |
| End Page | 105 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307672 |
| JaLCDOI | 10.18926/15533 |
|---|---|
| Title Alternative | RELATION BETWEEN THE MOTTLED TOOTH, STRUMA AND FLUORINE CONTENT OF DRINKING WATER INVESTIGATION ON BOYS AND GIRLSLIVIING IN YOSIOKA HOT SPRING AND ITS VICINITY,TOTTORI PREFECTURE, JAPAN |
| FullText URL | 005_064_075.pdf |
| Author | Onda, Sakue| |
| Abstract | In order to stady the relation between the mottled tooth, struma and fluorine content of drinking water, the author investigated the teeth and thyroid glands of school-boys and girls living in Yoshioka Hot Spring and its vicinity, Tottori Plefectue. Yoshioka Hot Spring is a simple thermal with high fluorine content (max. 5mg. per liter). The incidence of the mottled tooth was 51.5 per cent in average. A close relationship was observed between the morbidity of the mottled tooth and high fluorine content of drinking water. But the author noticed also the occurrence of the mottled tooth among the school-children living in the regions where the fluorine content of drinking water proved to be even less than o.1ppm., and the author emphasizes the possibility of the causal factors other tham fluoline. The palpability of thyroid gland was 78.4 per cent in average, but no significant relation was recognized between the struma and fluorine. Between the mottled tooth and struma, no relation was proved as significant, too. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1951-08 |
| Volume | volume5 |
| Start Page | 64 |
| End Page | 75 |
| ISSN | 0369-7142 |
| Related Url | http://eprints.lib.okayama-u.ac.jp/15926 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307214 |
| JaLCDOI | 10.18926/15523 |
|---|---|
| Title Alternative | STUDIES OF THE RAD10-ACTIVE SPRINGS (XXVIII). EFFECTS OF THE RADIO-ACTIVE THERMAL BATH ON CIRCULATION SYSTEM (1). |
| FullText URL | 004_023_039.pdf |
| Author | Onoda, Susumu| |
| Abstract | The author investigated the changes in skin temperature, oral temperature, blood pressure, pulse rate, respiration rate and weight of body before and after a radio-active thermal bath in Misaswa, and compared the results with the corresponding changes after a plain water bath at a same temperature (43℃) with same duration (5min.). A rise in skin temperature after the thermal bath durated longer than after the control plain water bath. Changes in oral temperature did not correspond to the changes in skin temperature and to the suhjective warm feeling. Changes in the pulse pressure showed no significant difference between the radio-active thermal bath and plain water hath. But a more prolonged lowering of the minimal blood pressure was proved after a radio-active thermal bath than after a plain water bath at same temperature with same duration. The response in blood pressure to thermal bath was more marked in winter than in summer. A rise in pulse rate was recognized after all kinds of hot baths, but no difference was proved between them. A slight acceleration of respiration rate and a loss in weight were observed after hot bath at 43℃ for 5 minutes. But these effects were slighter after radio-active thermal bath than after plain water bath at same temperature and same duration. |
| Publication Title | 放射能泉研究所報告 |
| Published Date | 1951-03 |
| Volume | volume4 |
| Start Page | 23 |
| End Page | 39 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307268 |
| JaLCDOI | 10.18926/15470 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_24_1_13.pdf |
| Author | Uno, Yoshiyuki| Nakajima, Toshikatsu| Endo, Osamu| |
| Abstract | The generation mechanism of crater in electrical discharge machining is analyzed with a single pulse discharge device for alloy tool steel, black alumina ceramics, cermet and cemented carbide, investigating the gap voltage, the discharge current, the shape of crater, the wear of electrode and so on. The experimental analysis makes it clear that the shape of crater has a characteristic feature for the kind of workpiece. The shape of electrode, which changes with the wear by an electric spark, has a significant effect on the shape of crater. The diameter and the depth of crater have a close relation to the discharge energy for alloy tool steel, black alumina ceramics and cermet, while those for cemented carbide are related to the discharge current. The shape factor which is the ratio of the depth to the diameter of crater is different for the work material. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1989-11-29 |
| Volume | volume24 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 24 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307269 |
| JaLCDOI | 10.18926/15447 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_28_1_129.pdf |
| Author | Taniguchi, Takeo| Hirose, Sohichi| Ouchterlony Finn| Nakagawa Kohji| Miyaji Akihiko| Fukuoka Yasufumi| |
| Abstract | The testing method of rock toughness is proposed by the international society of rock mechanics (ISRM), but the results may be influenced by the test pieces, and the details of the crack propagation and the stress intensity factors are not clarified through the testing. Also the experimental test requires tedious works for the preparation of test specimen and economical responsibility. The present study aims to simulate numerically the rock toughness testing which is proposed by ISRM. For this purpose, the authors propose a numerical method which can simulate the experimental testing, and they show the propriety of the proposed method by comparing the results with the experimental and other numerical methods. At the same time, they clarify the details of crack propagation behaviors in rocks, and show the change of the stress intensity factors. The proposed method is based on the displacement-type finite element method, and several techniques are introduced to obtain accurate solution of the mechanical behavior near the crack-tip area. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1993-11-30 |
| Volume | volume28 |
| Issue | issue1 |
| Start Page | 129 |
| End Page | 138 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307126 |
| JaLCDOI | 10.18926/15425 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_2_1.pdf |
| Author | Inaba, Hideo| Otake, Hideo| Nozu, Shigeru| |
| Abstract | Radiative characteristics of the frost layer melted by radiative heat are experimentally examined. A frost layer is heated from above by the radiative heat from a halogen lamp set. Thermal radiation of the lamp has the wavelength spectrum characteristics similar to those of the solar radiation. The effect of the environmental temperature upon the frost melting process is clarified in experiments. The optical characteristics of reflectivity, absorptivity and transmissivity of the frost layer during the melting of the frost layer are measured using special measuring instruments. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1992-03-28 |
| Volume | volume26 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 16 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307428 |
| JaLCDOI | 10.18926/15422 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_57.pdf |
| Author | Totsuji, Hiroo| |
| Abstract | As plasmas with extremely reduced dimensionality, properties of one-dimensional classical plasmas are analyzed in the domain of strong coupling and static and dynamic structure factors and the plasmon dispersion relation are obtained. These plasmas may be realized in Penning traps with sufficiently strong confinement and also in semiconductor quantum wires under appropriate conditions. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 57 |
| End Page | 65 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307838 |
| JaLCDOI | 10.18926/15413 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_23.pdf |
| Author | Kajihara, Yasuhiro| Osaki, Hirokazu| Dong Rui| |
| Abstract | A method for reducing the variety of parts is proposed. The variety of parts in a product and the variety of parts among products are evaluated in consideration of some factors that influence the production cost. Rules are formulated for selecting parts which should be eliminated or whose designs should be changed to reduce these varieties. An expert system is developed based on this method for reducing the variety of parts. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 23 |
| End Page | 27 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307257 |
