result 8971 件
| JaLCDOI | 10.18926/15701 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_11_1_7.pdf |
| Author | Ishii Tadao| Doi Mitsuharu| |
| Abstract | An investigation was made of the anomalous electric field in its various aspects in n-type InSb subjected to strong magnetic field at 77K and 273K, which lead to the conclusion that no open contradiction arose between a part of the present observations and the predictions attainable from Yoshida's model of semimetals. There remained, however, the other part of the experimental results unexplained, being rather natural since an inner property of indium antimonide does not seem so simple comparing with the compensated metals, bismuth and antimony. Especially as for the mechanism of an inversion phenomenon of the polarity of a negative anomalous field at a critical pulse current, we have no available theory to explain at present stage. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-07-20 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 18 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307614 |
| JaLCDOI | 10.18926/15700 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_45.pdf |
| Author | Fujitsuka Takeshi| Agusa Toru| |
| Abstract | In this paper, the steady state operations of the squarewave inverter circuit with a series R-L load are discussed. The circuit consists of transistors and feedback diodes. The basic equation is derived from its equivalent circuit. Solving the basic equation with steady state conditions, the instaneous value of the load current i is derived. The period t(2) for which the current flows from the supply to the load and the period t(l) for which the current feedbacks through diodes from the load to the supply are calculated from (i), and the ratio of t(l) to t(2) is illustrated using power factor of fundamental wave, pf, as a variable. The ratios of transistor mean current I(tr), diode mean current I(D), supply mean current I(s) to the load current I are illustrated using pf as a variable, too. In result, each current ratios to I is shown in simple expressione. The load current can be calculated simply using the coefficient reading off the figure. In addition, it becomes clear from the figure that the load current is scarcely influenced by the harmonic voltage in less than 0.8 of pf. The ratio t(2)/(t(1)+t(2)) calculated in squarewave voltage, shows the limit of pulse width control whose out put voltage is the squarewave. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 45 |
| End Page | 52 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307473 |
| JaLCDOI | 10.18926/15697 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_61.pdf |
| Author | Misaki Takayoshi| Okamoto Takuji| Yamamoto Hideki| |
| Abstract | An asynchronous delay line for PAM signal having controlled delay capability is proposed. The delay line in a cascaded chain of identical memory cells. Each sample of the sequence of the input PAM signals passes or is shifted in particular cell depending on whether the succeeding cell is empty or not. A cell is composed of two memory capacitors with the peripheral control circuits. In this paper, especially, an example of the circuit for cell is shown and its several characteristics are discussed. At the end, some experimental results are given. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 66 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307866 |
| JaLCDOI | 10.18926/15696 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_1.pdf |
| Author | Tanaka Yutaka| |
| Abstract | In this paper, is proposed a calculating method for the simulation of oscillatory combustion state, and comparisons between estimation results and experimental ones are carried out. With respect to the effects of geometric dimensions of combustion system, and of fueland air-flow rate conditions on characteristics such as an amplitude of oscillation, its fluctuation, and a frequency, a theoretical analysis presents a correct estimation of the phenomena. By use of this analysis, it becomes possible exactly to estimate the changes which take place in the combustion system. On the basis of the quantitative feature of the theoretical results, the influences of the factors such as ignition lag, wall temperature ratio, and heat transmission on the combustion oscillation are studied. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 1 |
| End Page | 24 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307496 |
| JaLCDOI | 10.18926/15695 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_113.pdf |
| Author | Kono Ichiro| Sellmeijer J.B.| |
| Abstract | This paper deals with the groundwater flow in a semi-confined aquifer causing the phenomena of consolidation and free surface lowering. Since the main effect of consolidation has taken place before noticeable lowering of the free surface, one may solve each phenomenon on its own. The real solution may be obtained by the principle of superposition. However, the solution for lowering the free surface is delayed due to the cosolidation by a certain timelapse, depending on the placecoordinates. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 113 |
| End Page | 136 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307163 |
| JaLCDOI | 10.18926/15694 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_55.pdf |
| Author | Takeda Akira| Wada Satosi| Uno Takaaki| Fujita Haruki| Okamoto Tuneyuki| |
| Abstract | The importance of the presence of butenolide groupings in biologically active substances has been recognized increasingly. (1) In our search for new pesticides we have prepared 26 α-arylamino-γ-aryl-⊿(α,β)-butenolides (1-26) and 9 α-arylidene-γ-aryl-⊿(α,β)-butenolides (27-35) which seemed to us of interest as test materials for the screening. α-Arylamino-γ-aryl-⊿(α,β)-butenolides were prepared by the reaction of sodium or potassium arylidenepyruvate with arylamines in the medium of glacial acetic acid as is reported by Meyer and Vaughan(2) (Scheme I, see also Experimental Section). α-Arylidene-γ-aryl-⊿(β,γ)-butenolides were prepared by the condensation of aromatic aldehydes with β-aroylpropionic acids in the presence of anhydrous sodium acetate. The analogous procedure for this purpose has been reported by several authors(3) (Scheme II). The physical properties, yields, and analytical data of these compounds have been summarized in Table I (1-26) and Table II (27-35). |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 55 |
| End Page | 59 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307512 |
| JaLCDOI | 10.18926/15693 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_81.pdf |
| Author | Sakakibara, Akira| |
| Abstract | To acquire information on the interaction between oxygen molecules in solid phase, studies have been carried out on the magnetic properties of solid oxygen, oxygen-argon and oxygen-fluorine. Review of the studies on the interaction between oxygen molecules is cited. Magnetic susceptibility was measured by the Faraday method as a function of temperature from 12 K to the melting point of them. Pure oxygen both in α and β phase indicates paramagnetism corresponding to long-range antiferromagnetic order. Oxygen -argon mixtures of 92~66 mol% oxygen content indicate large susceptibility corresponding to δ phase, which can be interpreted in terms of the cluster of oxygen molecules in trimer. Small paramagnetism was found for the oxygenfluorine mixture even as dilute as 10 mol% oxygen content, which may be due to the strong antiferromagnetic interaction. This can be interpreted in terms of super-exchange interaction between oxygen molecules via fluorine molecule. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 81 |
| End Page | 111 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307359 |
| JaLCDOI | 10.18926/15692 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_63.pdf |
| Author | Fujiwara Yutaka| Osaki Hirokazu| Kikuchi Susumu| |
| Abstract | We tried to look at the allocation techniques in plant layout from the point of view of decision making theory. And it was made clear that Laplace, Minimax and Hurwicz princilpe can be applied to the allocation techniques. The techniques based on these principles were called Laplace method, Minimax method and Hurwicz method. In this paper algorithms and computer programs of these methods were described in order to solve the layout problems effectively. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 63 |
| End Page | 80 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307132 |
| JaLCDOI | 10.18926/15691 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_47.pdf |
| Author | Takahashi Katsuaki| Miura Yoshinari| |
| Abstract | Diffusion phenomena of silver ion in the molten sodium diborate of low silver ion content were investigated at the temperature range from 880℃ to 625℃ by means of chronopotentiometry. From the results, it was shown that the silver ion was reduced reversibly to metallic state at the silver electrode used and silver ion was transported only by diffusion in case that transition time in a potential-time relation was within several seconds. Diffusion coefficients measured at various temperatures satisfied Arrhenius equation. The activation energy of diffusion and diffusion coefficient were respectively 32Kcal/mol and 6.5×10(-7) cm(2)/sec at the liquidous temperature. By comparing these values with those obtained in some molten salts, the difference of structure between the molten glass and molten salts was discussed. Moreover, the consideration for the size of borate anion existing in the molten glass was also tried from the viewpoint of rate process and from Stokes-Einstein's equation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 53 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307810 |
| JaLCDOI | 10.18926/15690 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_55.pdf |
| Author | Nakata Takayoshi| Ishihara Yoshiyuki| Matsubara Kazunori| Nakano Masanori| |
| Abstract | A new method have been developed based upon analogue-to-digital conversion techniques and memories. The method involves the scaling of operating frequency from "real" to "optimum" for the power loss measurement. The advantages of using this techniques are as follows: (1) extreme availability at lower frequency region, (2) high accuracy and high stability, (3) simple measuring procedure, (4) digital indication. This method can be measured the power losses over the frequency range 0.1Hz to 1kHz for magnetic circuit and d.c. to 1kHz in such a purely resistive circuit. We estimate the accuracy of this core loss measuring system within 1.0% over all these frequency range. Using this system, specific core losses of the various grades of silicon iron have been measured in the frequency range 0.1Hz to 200Hz. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 55 |
| End Page | 61 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307969 |
| JaLCDOI | 10.18926/15688 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_45.pdf |
| Author | Himei Toyoji| Nakanishi Senichiro| Komatubara Hitoshi| Kawata Sigeo| Onishi Fujio| Tabuchi Takashi| |
| Abstract | When a transformer is energized, the inrush of abnormally high magnetizing current may be noted for a short time until normal flux conditions are established. This may cause the failure of a protective relay, so many preventives are usually accepted for the purpose of normal relay performance. The authors, instead, now have tried to control the inrush current itself, by means of the soft starting method using two reverse parallel thyristors. In this paper, the method to control the inrush current itself, is presented by the soft-starting method using thyristors. The experimental results of this Method verifies the good controlability of the transient magnetic flux of a transformer and then the availability of the control of magnetizing inrush current in the cases of a single phase connection and a three phase one. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 45 |
| End Page | 54 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307871 |
| JaLCDOI | 10.18926/15686 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_31.pdf |
| Author | Wada Tsutomu| Shimizu Akira| |
| Abstract | Though the Warren's fluidic counter has a very simple construction, the matching problems of the main jet supply pressure with the input pulse may take place and so there may be some working conditions under which this counter cannot work. Up to now, these matching problem have been hardly investigated. In this study the following things were systematically investigated : the static and dynamic characteristics of the memory and the control flip-flops with different geometric parameters, the behavior of the counter which are constructed by two of them, and finally the fow in the counter. The obtained results are as follows : (1) Under some clear and accurate conditions, the Warren's counter works satisfactory without any au iliary circuit. (2) In the control part, the input pulse flow don't reattach on any side wall, but branches into both output ports. (3) The necessary condition under which the Warren's counter behaves successfully is as follows : (1-2α)Q(i)>Q(ms), where α is the distribution factor of the control part, is the input pulse flow rate and is the switching control flow rate of the memory part. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 35 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307883 |
| JaLCDOI | 10.18926/15685 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_25.pdf |
| Author | Torii, Sigeru| Tanaka, Hideo| |
| Abstract | Ethyl dl-jasmonate (1a) and ethyl dl-2-epi-jasmonate (1b), novel constitutents in jasmin absolute from Italian Jasminum grandiflorum L, were prepared from 8-endo-(2'-cis-pentenyl)-3-oxo-2-oxa-bicyclo [3.2.1] octane, jasmine acid δ-lactone(2). Improvement of the preparation of the intermediate (9), a key precursor of (2), was made by different route via lactonization of (7) and/or (8). NMR and IR spectra (la) and (1b) are given. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 25 |
| End Page | 30 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307609 |
| JaLCDOI | 10.18926/15684 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_15.pdf |
| Author | Shimamoto Yuzuru| Tanaka Yutaka| |
| Abstract | Results of calculations and experiments on the cold co-axial flow presented in this paper are summalized as follows ; (1) A theoretical expression method for co-axial flow field of two dimension is investigated to estimate more exactly the flow profile and the velocity gradient. (2) Measurements of mixing length were carried out for the confined co-axial jet flow. On the basis of measured data, inquiry is made for the propriety of the assumption proposed in the previous paper (1) that the mixing length may be expressed as a function of the minimum distance to the nearby wall. (3) Experimental inquiry was also done on the corelation between Lagrangian length scale and the mixing length. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 15 |
| End Page | 24 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307794 |
| JaLCDOI | 10.18926/15683 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_27.pdf |
| Author | Kikuchi Susumu| Osaki Hirokazu| Ohgishi Shinji| |
| Abstract | The work load given to workers by a monotonous task was investigated. Their load was obtained by measuring the flicker value and observing its fluctuation pattern. Each flicker fluctuation was classified into one of the three patterns. It was found that the mental load of the subject carrying out the task by himself tends to become lighter according as the speed increases, while the mental load of the subject doing the task with his companion does not show this tendency. On the other hand, the scores of the disposition tests were analyzed with regard to the flicker fluctuation pattern by using the discriminant function. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 27 |
| End Page | 30 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307841 |
| JaLCDOI | 10.18926/15682 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_17.pdf |
| Author | Shimamoto Yuzuru| Tanaka Yutaka| |
| Abstract | This paper deals with a combustion stability of diffusion flame. A simplified linear differential equation of second order, which involves the parameters estimated from the states of steady combustion, has been suggested to discuss theoretically the nature of oscillatory combusion about a two-dimensional combustion chamber. Its validity has been testified by comparing calculated results with experimental ones. Results obtained have indicated that factors markedly affecting the low-frequency oscillatory combustion are primary volumetric air-fuel ratio, duct length of combustion side, shape of burner and inlet throttles. But outlet throttle gives little effect on the stability of combustion. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 17 |
| End Page | 26 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307571 |
| JaLCDOI | 10.18926/15681 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_1.pdf |
| Author | Honda Kazuo| Hosokawa Norio| Sarai Takaaki| |
| Abstract | The diffracted intensity of X-ray depends upon several physical and geometrical factors such as structure, multiplicity, absorption and Lorentzpolarization and measuring conditions such as time constant and scanning speed of detector on counter method[l]. For analyzing on the X-ray stress measurement, especially, profile shape of X-ray diffraction which is affected by geometrical factors such as absorption and Lorentz-polarization is very important. In order to eliminate these factors affecting the stress measured by using X-ray, the correcting factors were introduced and those theoretical values were calculated. After this theoretical calculation, it is found that as the half value breadth increases the difference between the stress measured by using X-ray and the corrected one becomes larger and larger under same measuring condition. When the ideal diffracted intensity of X-ray is assumed Cauchy distribution the measured stress depends upon measuring condition for same specimen, but it is independent of measuring condition in Gauss, distribution. Consequently, it is found that the stress measured by using X-ray must be corrected under each measuring condition and the method of correction is made clear and proved experimentally in this paper. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 13 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307339 |
| JaLCDOI | 10.18926/15680 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_5_7.pdf |
| Author | Hosokawa Norio| |
| Abstract | The loading and residual stresses measured by using X-ray stress measurment depend on diffraction plane. In order to make clear its cause, the several models on elastic and plastic deformations are developed and the theoretical values are compared with measured ones. It was found that the dependencies of measured stress on the diffraction plane can be explaned by accepting Reuss's model for elastic deformation and Taylor's model for plastic deformation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1970-09-01 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 15 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307629 |
| JaLCDOI | 10.18926/15679 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_1_49.pdf |
| Author | Ohta, Mutsuo| Kawazoe, Hisami| Sakakibara, Akira| |
| Abstract | Binding energy between a vacancy and a Zn atom in Al was investigated by measurement of as-quenched resistivity in Al-0.021at % Zn and pure-Al, with the estimation of vacancy loss during quenching. The contribution of clusters to resistivity in Al-0.021at % Zn waa also investigated. Their results are summarized as follows: (1) The results of isothermal and isochronal annealing indicate that clusters in Al-0.021at % Zn cnuld not be detected beyond the experimental errors. (2) The model applied to estimate the vacancy loss in pure-Al has enough validity. The quantitative estimation of clusters ana the improvement in experimental conditions are greatly desired, which enable the more detailed, analysis of the data. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1975-07-01 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 49 |
| End Page | 59 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307807 |
| JaLCDOI | 10.18926/15678 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_1_39.pdf |
| Author | Ohta Mutsuo| Hamamoto Takao| |
| Abstract | As to Al-Zn alloy, the difference between the formation of G.P.zones and that of clusters was investigated by measurements of electrical resistivity. The results obtained were summarised as follows: (1) G.P.zones formed during the quench and quenched-in vacancies increase greatly as-quenched resistivity P(o) as quenching temperature Tq is raised, and clusters increase slightly P(o) as Tq is lowered. (2) For one Tq and one Ta, the time required to reach P(e)' for Al-1.3at % Zn alloy is longer than that for Al-3.0at % Zn alloy. This is due to the difference of number of zinc atom in the clusters. (3) For one Ta and one concentration of zinc, the time required to reach p'(e) at Tq = 170℃ is longer than that at Tq = 300℃. This is due to the difference in concentration of quenchedin vacancies. As to Al-Cu alloy, the solvus temperature for G.P.zones was determined from the existence of P(m) in ageing curves by measurements of electrical resistivity. Consequently the solvus temperature is between 20℃ and 60℃. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1975-07-01 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 47 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307266 |
