result 49270 件
| JaLCDOI | 10.18926/15629 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_4_13.pdf |
| Author | Hirose Koji| Asano Yoshihiro| |
| Abstract | In this study, friction coefficients for sectionally roughened square ducts were measured for transional and turbulent flow. The velocity fields in the cross section were mesured for turbulent flow, and the predicting equation in the previous report was corected. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1969-09-01 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 17 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307654 |
| 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 | 10.18926/15627 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_4_1.pdf |
| Author | Honda Kazuo| Konaga Tetsuro| |
| Abstract | In the present paper, to provide information on the stress measurement in coarse grained materials by X-ray micro-beam diffraction technique using a crystal oscillation method, the authors first examined experimentaly and theoretically the relation between the sizes of X-ray beam and crystal to obtain the particular diffraction ring in the case of use of crystal oscillation method. The specimen attachment of X-ray camera used in this experiment can be oscillated automatically around a horizontal and vertical axes with high accuracy centering around an illuminated position on the specimen surface. Accordingly it is possible to increase the number of the diffraction spots without changing the area and position of the specimen illuminated. Experiments were carried out for three kinds of annealed low careon steel with grain sizes of about 15, 30 and 50μ in diameter, and with X-ray beam collimated by pinhole slits of 0.12, 0.30 and 1.00 mm in diameter, using CrKα characteristic X-rays. On the other hand, a theoretical analysis was carried out according to the X-ray diffraction theory which have been proposed by P. B. Hirsch et al. As the conclusion, it is found that the crystal oscillation method is extremely useful for X-ray stress measurement of coarse grained materials. Moreover, the conditions of the crystal oscillating operation were clarified theoretically for any pair of the sizes of X-ray beam and crystal. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1969-09-01 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 8 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307720 |
| JaLCDOI | 10.18926/15626 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_6_1.pdf |
| Author | Honda Kazuo| Konaga Tetsuro| |
| Abstract | It is very important to clarify the question whether fatigue crack propagation will be affected by mechanical propaties or other propaties of materials. In the present paper the authors studied in relation of yield strength and stacking fault energy to rate of fatigue crack propagation. αbrass were chosen for the investigation because they provided sufficient range in both quantities of interest that either could be varied independently of the other. Fatigue tests were carried out under full bending moment of flat specimens with V-shape notch. Chosen stress levels were 0.6 σy and 0.8 σy in which σy is yield strength, rate of fatigue crack propagation was evaluated from the second stage of the curve of fatigue crack propagation. The dependence of the rate on stacking fault energy γ was found to be dl/ dN=G・γ(n). But dl/dN did not systematically to change in yield strength. Thus, γ is concluded to be the controlling variable. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1971-09-01 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307864 |
| JaLCDOI | 10.18926/15625 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_77.pdf |
| Author | Monobe Kazuo| Yamashita Yuhiko| Fujiwara Yasuo| Fujiwara Yoshitaka| |
| Abstract | We tried to clarify the crystallization mechanism of long chain polymers in solution under shearing stress using polyethylene. From the bright and dark field electron microscope observations and the electron diffraction study, we demonstrated that the resulting fibrous crystals consist of the central threads with an extended chain character and the lamellae with a folded chain character nucleated on the threads. The measurements of thermal and mechanical properties gave the additional confirmation for this suggestion. From these results we discussed the crystallization mechanism on the fibrous crystals. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 77 |
| End Page | 83 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307234 |
| JaLCDOI | 10.18926/15624 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_157.pdf |
| Author | Misaki Takayoshi| Okamoto Takuji| Kato Osamu| |
| Abstract | In the analog circuits for the systms governed by the dilfercntial equations with the coefficients which are a function of one or mOre of the dependent variables, the magnitudes of their circuit elements must be variable in accordance with the nature of the function. Such circuit elements can be realized by means of inserting or removing the additional elements with high speed switches in the analog circuits. Particularly, in the case of varying stepwise this method is effective. But as an analog circuit is regarded as a short-time or repetitive type analyzer, the above switches must be instantaneous operation. In this paper, first, it is made sure by the experiments that some of the transistor switches arc met this condition, and moreover arc very low closed resistance, very high open resistance and neglegible small voltage offsets. Next, the basic technique for the direct analog simulation usiug transistor switches is described about the simple example, i.e. the oscillatory system with varying cross-scctional surge tank. Finally, as its applications, the transient problems of these oscillatory systems arc solved by means of these analog circuits. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 157 |
| End Page | 162 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307953 |
| JaLCDOI | 10.18926/15623 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_151.pdf |
| Author | Himei Toyoji| Inoue Jyunichi| Kondo Tadao| Nakanishi Senichiro| |
| Abstract | The waveform of the load current has been analyzed theoretically on the single-phase series R-C circuit controlled by the back to back SCR pair. And then, the fluctuation of the barmonics calculated by the use of the electronic digital computer, has been discussed as for the firing angles of SCRs and the phase angle of load. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 151 |
| End Page | 155 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307534 |
| JaLCDOI | 10.18926/15622 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_143.pdf |
| Author | Himei Toyoji| Inoue Jyunichi| Fukumori Kooichi| |
| Abstract | A modified type of the resonant turn-off d-c chopprr using an auxiliary SCR, compared with its conventional one, has no limitation about its starting and also operates more steadily. Presented in this paper, making a comparison between the modified type and the conventional one, are the circuit analysis and its efficiency measurement from the point of view of overall efficiency, that is, the ratio of the output to the input. Furthermore, some effects of the source impedance, counter emf load, etc. are discussed. As a result, it has been analytically clarified that this modified type is different from the conventional circuit only by one terminal connection of turn-off capacitor, but has the features of uncompounded circuit configuration, no limitation about its starting and more steady operation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 143 |
| End Page | 150 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307152 |
| JaLCDOI | 10.18926/15621 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_137.pdf |
| Author | Himei Toyoji| Fujitsuka Takeshi| Inoue Jyunichi| Komatsubara Hitoshi| Kadowaki Masahiko| |
| Abstract | The measurement of the dissipated energy in switching-off has been attempted to make clear the function of spark on electric contacts, which may unfortunately cause the combustible gas, such as propane gas etc, to catch fire and result in fire accidents. By utilizing the "Memoriscope" has been the meaurement carried out and the feature of this method is to provide the information on not only the amount of dissipated energy involved in one action but also on the trace of its instantaneous power which can affect catching fire delicately. Presented in this paper are the discussion of this measuring method and the measured results which are obtained experimentally in order to investigate the dependence of the energy dissipation on variety of contacts, contacts' deterioration and circuit arrangements. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 137 |
| End Page | 142 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307412 |
| JaLCDOI | 10.18926/15620 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_131.pdf |
| Author | Himei Toyoji| Fujitsuka Takeshi| Inoue Jyunichi| Wakabayashi Jiro| |
| Abstract | The a-c voltage control circuit, composed of parallel connection of a SCR and a reactor, gives the similar performance as the control circuit of a back to back SCR pair. However, the control characteristics of this circuit is affected by magnetizing characteristics of reactor. In this paper, the circuit with the resistive load has been analyzed by using the approximated models of hysteresis loop of core materials, where the SCR's forward voltage drop is taken into account. The results of the analysis have revealed the facts as follows, I) The control characteristics of the a-c voltage in average value is independent on the magnetizing characteristics of reactors except in the vicinity of minimum output point. But, in effective value, it is not valid. 2) A SCR's forward voltage drop results in the reduction of not only SCR's current but also reactor's current. 3) The a-c output current does not include the d-c component, if the winding resistance of the reactor is negligible. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 131 |
| End Page | 136 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307481 |
| JaLCDOI | 10.18926/15619 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_127.pdf |
| Author | Nakata Takayoshi| Ishihara Yoshiyuki| |
| Abstract | In order to measure the iron loss of the silicon steel plates, we produced a vectormeter using a thyristor and a gate turn off thyristor by way of experiment. This equipment is very useful, because the frequency range is improved very much in comparison with the vectormeter which is composed of the mechanical rectifying system using a synchronous motor, namely, is enlarged from 60Hz to 1kHz, |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 127 |
| End Page | 130 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307274 |
| JaLCDOI | 10.18926/15618 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_123.pdf |
| Author | Moriwake Tosio| Honjo Yozo| |
| Abstract | Condensation of chroman-4-one with ethyl formate in the presence of sodium methoxide gave 3-hydroxymethylenechroman-4-one (II). Reaction of II with hydroxylamine hydrochloride, followed isomerization by potassium t-butoxide gave IV. 3-Cyano-3-methylchroman-4-one was obtained by methylation of IV or treatment of III with potassium t-butoxide and methyl iodide. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 123 |
| End Page | 126 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307167 |
| JaLCDOI | 10.18926/15617 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_119.pdf |
| Author | Takeda Akira| Wada Satosi| Uno Takaaki| Masuike Taketosi| Torii Sigeru| |
| Abstract | The preparation of the title compounds as a new type of stable S-ylides has been described. The reaction of 1-dimethylsulfuranylidene-1-phenylsulfonyl-2-propanone (IIb) with lithium aluminium hydride was found to result in the formation of trans-phenylpropenylsulfone (IV), phenylsulfonyl-2-propanone (Ib), and an unidentified paraffin as major products. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 119 |
| End Page | 122 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307991 |
| JaLCDOI | 10.18926/15616 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_113.pdf |
| Author | Takeda Akira| Wada Satosi| |
| Abstract | A series of α-monoalkylamino-α-arylacetamides and α-dialkylamino-α-arylacetamides have teen synthesized via the corresponding nitriles. Some of these compounds have been found to exhibit moderate activity as herbicides. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 113 |
| End Page | 117 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307743 |
| JaLCDOI | 10.18926/15615 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_107.pdf |
| Author | Takeda Akira| Torii Sigeru| Oka Hirotosi| |
| Abstract | The electrochemical oxidation of trans-cinnamic acid in a mixed aqueous solution of acetic acid and methanol containing potassium hydroxide was studied. The separation of ketones and aldehydes from the neutral materials using Girard reagent P gave benzaldehyde, tolualdehydes, acetophenone, methylacetophenones, propiophenone, phenacyl acetate, and phenacyl alcohol. The mechanism of the anodic reaction of trans-cinnamic acid has been discussed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 107 |
| End Page | 112 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307863 |
| JaLCDOI | 10.18926/15614 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_101.pdf |
| Author | Hirai Taketsugu| Takahashi Katsuaki| |
| Abstract | Potential sweep voltammetries of Na(2)O·SiO(2) and Na(2)O·2SiO(2) at 730-1200°C were performed with the stationary platinum wire electrode and with the sweep rates of 40 and 120mV/sec. Although current-potential relation of Na(2)O . SiO(2) at 1200°C gave stationary S-shape pattern, those of the rest were transient modes with hysteresis. From the voltammetric considerations, a reversible oxygen electrode process where diffuion of free oxygen anion or silicate anion may be a rate-determining stage was tentatively proposed. Approximate estimations of decomposition voltage supported that a sole reaction process such as the decomposition of Na(2)O or indirect decomposition of SiO(2) in the melt was most probable. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 101 |
| End Page | 105 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307459 |
| JaLCDOI | 10.18926/15613 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_95.pdf |
| Author | Suefusa Kiyoshi| Monobe Kazuo| |
| Abstract | Polyethylene was crytallized from the molten film under temperature gradient. As a result, the optically positive spherulites were observed, though only the negative spherulites had been observed previOusly in polyethylene. When the radial structure units twisted regulary in a spherulite are formed parallel to the surface of the film, the spberulite is usually optically negative in polyethylene. In this study, the temperature gradient normal to the surface of the film gives so significant tilt of the radial structure units formed to the surface of the film that the radial refractive index becomes larger than the tangential one under the transmitted polarized light and the spherulites have optically positive behavior. The optical behaviors of the polyethylene spherulites and the crystallizing condition were studied and discussed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 95 |
| End Page | 100 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307360 |
| JaLCDOI | 10.18926/15612 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_89.pdf |
| Author | Monobe Kazuo| Yamashita Yuhiko| Fujiwara Yasuo| Fujiwara Masahiko| |
| Abstract | It was shown that the fibrous crystals of isotactic polybutene-l crystallized from solution under shearing stress are also composed of the central threads with an extended chain character and the epitaxally deposited lamellae with a folded chain character. The characteristic behaviors in this polymer exist in; (1) that the resulting crystals possess the hexagonal modification of form 1'; (2) that at low polymer concentrations the lamellar crystals with an orthorhombic modification of form Ⅲ are precipitated in similar fashion to the case in the absence of stirring; (3) that the morphology in surface replica of thick deposited film is very similar to that of melt extruded polyethylene film crystallized in a highly stressed state. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 89 |
| End Page | 94 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307171 |
| JaLCDOI | 10.18926/15611 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_85.pdf |
| Author | Monobe Kazuo| Fujiwara Yasuo| Yamashita Yuhiko| Hironaka Kiyoshi| |
| Abstract | Isotactic polypropylene was crystallized in the form of fibrous crystals from solution under shearing stress. The fibrous crystals consist of the oriented cluster of micro fibrils. From the electron microscopy and the electron diffraction study, it was found that the fine texture of this fibrous crystals is also the two component systems which are composed of the central threads with an extended chain character and the lamellae with a folded chain character deposited on the threads, as in polyethylene. Relatively larger lamellar structure than that of polyethylene was observed. The effect of crystallization conditions to the formation of the fibrous crystals from solution of isotactic polypropylene was described briefly. A characteristic melting behavior due to the melting of the central threads with an extended chain character was observed from the thermogram of differential scanning calorimeter. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 85 |
| End Page | 88 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307605 |
| JaLCDOI | 10.18926/15610 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_3_73.pdf |
| Author | Torii Sigeru| Isikawa Tatsuo| Takeda Akira| |
| Abstract | Amide derivatives of γ-substituted paraconic and aconic acids have been synthesized. Ultraviolet spectra of the aconic acid derivatives showed characteristic fine structure in the region of 245 to 280 mμ. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1968-09-01 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 73 |
| End Page | 76 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307690 |
