result 24391 件
| JaLCDOI | 10.18926/15717 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_153.pdf |
| Author | Fukui, Kiyoshi| Nogi, Shigeji| Yamada, Masuo| Sakakibara, Akira| |
| Abstract | A unified treatment of injection and mutual phase locking phenomena in microwave oscillators coupled by a network characterized by a Y-matrix is presented. Under certain simplifying assumptions, steady state solutions such as locking frequency and oscillation phase relation are given with emphasis placed on the coupling-network dependence of locking bandwidth. Also, some examples of locking system specified by y(21)=0, Y(21)= Y(12) and y21= -Y12 are briefly discussed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 153 |
| End Page | 162 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307532 |
| JaLCDOI | 10.18926/15715 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_133.pdf |
| Author | Ohta, Mutsuo| Kanadani, Teruto| Yamada, Masuo| Sakakibara, Akira| |
| Abstract | Aging and reversion in dilute Al-Ag alloys are studied by means of the measurements of electrical resistivity. Results obtained are as follows: 1) Increase in the as-quenched resistivity is found for a low quenching temperature. This increase may be due to the fluctuation of solute concentration at the quenching temperature. 2) When the fluctuation exists in the alloy, the aging rate becomes slow and the maximum resistivity in the isothermal aging curve becomes small as the vacancyconcentration becomes low. The maximum resistivity becomes large again when the vacancy concentration becomes further lower, and finally the maximum does not appear. 3) These behaviors are explained in terms of the difference in the rate of growth of the G.P. zones in the regions of higher and lower solute concentration induced by the fluctuation and in terms of the change of this difference with vacancy concentration. 4) G.P. zones may be formed by the spinodal decomposition with indefinite surfaces at first, grown to larger ones with difinite surfaces and changed to ordered nzones in the alloy. 5) It is confirmed that G.P. zones are formed by the nucleation-and-growth mechanism also in Al-Ag alloys above the spinodal temperature. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 133 |
| End Page | 152 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307468 |
| JaLCDOI | 10.18926/15713 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_11_2_51.pdf |
| Author | Inouye Hiroshi| |
| Abstract | In this paper some computational methods of traffic assignment are proposed. At first solutions of traffic assignment by the equal travel times principle used nonlinear programmings are showed. They are a method to approximate by a quadratic programming, a method to use the SUMT transformation, a method to apply Rosen's gradient projection method and a method to apply the conjugate gradient projection method. Through a computational example the efficiency of them are compared. To decide route flows uniquely in traffic assignment by the equal travel times principle, a method requesting route flows such that the joint probability is a maximum under supposed a priori probabilities is proposed. In case of a traffic assignment in a large scale road network, it is significant to improve the efficiency of route searches. For this purpose a technique of minimum time route search by division of a network is proposed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1977-01-25 |
| Volume | volume11 |
| Issue | issue2 |
| Start Page | 51 |
| End Page | 71 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307829 |
| JaLCDOI | 10.18926/15710 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_11_2_27.pdf |
| Author | Nago Hiroshi| |
| Abstract | In this paper the influence of a vertical lip upon the contraction coefficients of underflow gates is discussed. The coefficients of inclined gates with a vertical lip are investigated theoretically by using the method of conformal mapping. Solutions are obtained numerically for several values of the inclination of gate bottom. Theoretical solutions show that;as the length of a lip increases, the coefficient rapidly decreases from the value for the inclined gate, and when the length becomes of the order of a gate openning,it takes a value to be nearly equal to that for a vertical gate. These theoretical results are verified by experiments. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1977-01-25 |
| Volume | volume11 |
| Issue | issue2 |
| Start Page | 27 |
| End Page | 36 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307779 |
| JaLCDOI | 10.18926/15709 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_95.pdf |
| Author | Ohta, Mutsuo| Kanadani, Teruto| Yamada, Masuo| Sakakibara, Akira| |
| Abstract | Aging process in Al-Zn alloys was studied by the measurements of the electrical resistivity when the alloy was quenched from a high temperature, about 300℃ (the first quenching temperature), to an intermediate temperature, between 110℃ and 230℃ (the second quenching temperature), held at this temperature for a time, quenched again into iced water and aged at a low temperature. Variation of the holding time at the second quenching temperature brings about the variation of the isothermal aging curves. Maximum resistivity of the isothermal aging curve, p(max) , decreases at first, passes a minimum and then increases to reach a stationary value as the holding time at the intermediate temperature increases. It is pointed out that this phenomenon is mainly due to the fluctuation of solute concentration and the vacancy concentration decreasing at the intermediate temperature. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 95 |
| End Page | 117 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307526 |
| JaLCDOI | 10.18926/15705 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_11_1_31.pdf |
| Author | Inouye Hiroshi| |
| Abstract | In this paper we deal with traffic behaviours on a section of highway including an on-ramp by means of queuing theory. It is the purpose of this paper to provide the adequate capacity for highway on-ramps, which is useful for the design of on-ramps and the traffic control of highway. The highway on-ramp merging is modeled as a queue and the system is solved. Then the maximum possible flows for merging from an on-ramp is obtained in a form of an function of through lane flows. The traffic capacity of an on-ramp is estimated from the relation between the average waiting time before merging and the incoming flow from an on-ramp, which is induced by the theory of queues. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-07-20 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 43 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307164 |
| JaLCDOI | 10.18926/15703 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_11_1_19.pdf |
| Author | Koga, Ryuji| |
| Abstract | An optimal control is giyen for regulating power distribution in a nuclear power reactor which has cylindrical geometry. The space dependence of the system is described by expanding space depenident variables by Helmholtz modes. Results are obtained through the principle of optimality and are described by the Riccati-type algebraic equation that the optimal feedback coefficients should satisfy. Use of an integral equation as the system equation makes it possible to deal with actual controlling apparatuses: control rods or rod clusters. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-07-20 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 30 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307572 |
| 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 | 10.18926/15696 |
|---|---|
| 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 | 10.18926/15690 |
|---|---|
| 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 | 10.18926/15684 |
|---|---|
| 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 | 10.18926/15676 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_1_17.pdf |
| Author | Osaki Hirokazu| Kikuchi Susumu| |
| Abstract | In multivariate analysis, the linear discriminant analysis and the test for differences between mean values of two populations are of wide application. It is not essential to increase the variables only in order to increase the degree of accuracy of discrimination or test without evaluating the effect of variables. Therefore the computer program of selection procedures of variables in these two methods is mentioned in this paper. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1975-07-01 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 17 |
| End Page | 37 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307596 |
| JaLCDOI | 10.18926/15671 |
|---|---|
| FullText URL | 009_02_107_118.pdf |
| Author | Okamoto Takuji| Misaki Takayoshi| |
| Abstract | The dynamic design of a tunnel-diode-transistor combined circuit and the applied pulse circuits are discussed. The combined circuit, in which a tunnel diode is connected in parallel with the collector junction of a transistor, is used. The dynamic design procedure is considerably simplified by describing the transient behavior of a tunnel diode with a set of approximate expressions and by the help of a selfanalog simulator. This circuit is capable of carrying out both memory and majority logic operations, and serves as a basic unit for several different pulse circuits, such as a mcnostable circuit, a frequency divider, a ring counter, etc. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1974-12-25 |
| Volume | volume9 |
| Issue | issue2 |
| Start Page | 107 |
| End Page | 118 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307235 |
