検索結果 19462 件
| JaLCDOI | 10.18926/15700 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_45.pdf |
| 著者 | Fujitsuka Takeshi| Agusa Toru| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-03-05 |
| 巻 | 13巻 |
| 開始ページ | 45 |
| 終了ページ | 52 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307473 |
| JaLCDOI | 10.18926/15697 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_61.pdf |
| 著者 | Misaki Takayoshi| Okamoto Takuji| Yamamoto Hideki| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 61 |
| 終了ページ | 66 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307866 |
| JaLCDOI | 10.18926/15696 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_1.pdf |
| 著者 | Tanaka Yutaka| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-03-05 |
| 巻 | 13巻 |
| 開始ページ | 1 |
| 終了ページ | 24 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307496 |
| JaLCDOI | 10.18926/15695 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_113.pdf |
| 著者 | Kono Ichiro| Sellmeijer J.B.| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 113 |
| 終了ページ | 136 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307163 |
| JaLCDOI | 10.18926/15693 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_81.pdf |
| 著者 | 榊原 精| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 81 |
| 終了ページ | 111 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307359 |
| JaLCDOI | 10.18926/15691 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_47.pdf |
| 著者 | Takahashi Katsuaki| Miura Yoshinari| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 47 |
| 終了ページ | 53 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307810 |
| JaLCDOI | 10.18926/15690 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_55.pdf |
| 著者 | Nakata Takayoshi| Ishihara Yoshiyuki| Matsubara Kazunori| Nakano Masanori| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 55 |
| 終了ページ | 61 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307969 |
| JaLCDOI | 10.18926/15688 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_45.pdf |
| 著者 | Himei Toyoji| Nakanishi Senichiro| Komatubara Hitoshi| Kawata Sigeo| Onishi Fujio| Tabuchi Takashi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 45 |
| 終了ページ | 54 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307871 |
| JaLCDOI | 10.18926/15686 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_31.pdf |
| 著者 | Wada Tsutomu| Shimizu Akira| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 31 |
| 終了ページ | 35 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307883 |
| JaLCDOI | 10.18926/15685 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_25.pdf |
| 著者 | Torii, Sigeru| Tanaka, Hideo| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 25 |
| 終了ページ | 30 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307609 |
| JaLCDOI | 10.18926/15684 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_15.pdf |
| 著者 | Shimamoto Yuzuru| Tanaka Yutaka| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 15 |
| 終了ページ | 24 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307794 |
| JaLCDOI | 10.18926/15683 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_27.pdf |
| 著者 | Kikuchi Susumu| Osaki Hirokazu| Ohgishi Shinji| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 27 |
| 終了ページ | 30 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307841 |
| JaLCDOI | 10.18926/15682 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_17.pdf |
| 著者 | Shimamoto Yuzuru| Tanaka Yutaka| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 17 |
| 終了ページ | 26 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307571 |
| JaLCDOI | 10.18926/15679 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_1_49.pdf |
| 著者 | Ohta, Mutsuo| Kawazoe, Hisami| 榊原 精| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1975-07-01 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 49 |
| 終了ページ | 59 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307807 |
| JaLCDOI | 10.18926/15677 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_1.pdf |
| 著者 | Honda Kazuo| Konaga Tetsuro| |
| 抄録 | X-ray microbeam diffraction technique is a useful one to investigate the features of the crystal deformation in a localized area. That is, this method have been adopted to examine the density and array of dislocation, microscopic lattice strain and macroscopic residual stress. And so, the informations obtained from the tip of the crack during the fatigue process have been correlated with the behaviours of the initiation and propagation of the crack. The authors, in the present paper, investigated a relation between the distributions of the microscopic lattice strains which are calculated and measured by the technique, and suggested the sort of dislocation at the tip of the crack that relate to the fatigue crack propagation. The crack initiated at the notch root of the specimen which was composed of the coarse grain and propagated along the grain-boundary in the early stage under fatigue process of the alternating stress 4.1 kg/mm(2). Thereafter, it changed the propagating direction toward the inside of the grain. The distributions of the micro lattice strain in each reflecting plane which were measuerd at the plastically deformed zone in the vicinity of the grainboundary and at the crack tip agreed well with modes of the strain distribution due to a screw and a edge dislocations by the calculation, respectively. From these results, the authors concluded that the fatigue crack propagation would relate closely to the changing in the sort of the dislocation from the screw to the edge. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 6 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307657 |
| JaLCDOI | 10.18926/15675 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_4_65.pdf |
| 著者 | Himei Toyoji| Fujitsuka Takeshi| Inoue Jyunichi| |
| 抄録 | As one of the wide application of thyristor circuits, the inverter has a promising future and has been investigated vigorously. On the speed control of a squirrel cage induction motor by using a variable frequency thyristor inverter, although few papers have been presented, there seems to be many problems to be solved imminently. In this paper, the stability of performance of a thyristor inverter on this theme has been confirmed and some particular points with relation to practical use also have been discussed. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1969-09-01 |
| 巻 | 4巻 |
| 号 | 1号 |
| 開始ページ | 65 |
| 終了ページ | 73 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307309 |
| JaLCDOI | 10.18926/15674 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_1_1.pdf |
| 著者 | Nakajima Toshikatsu| Nakagawa Heisaburo| |
| 抄録 | This paper describes the basic boundary conditions in angular grinding, which is widely applied as a high efficiency machining and where a complicated-shaped workpiece is ground at the same time. The angular grinding is first classified into three basic types, an external, a surface and an internal angular grinding, depending on the axis angle between the wheel and the work axes. The undeformed chip shape, which is characterized by the interference angle, the maximum chip thicknes and the chip length, is then analyzed in each type of angular grinding. The effects of grinding conditions such as the axis angle, the speed ratio, the radius ratio and the successive cutting edge spacing upon the geometry of undeformed chip are discussed to make clear the relations between the basic boundary conditions and the working conditions in angular grinding. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1975-07-01 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 16 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307122 |
| JaLCDOI | 10.18926/15673 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_4_57.pdf |
| 著者 | Takahashi Teruo| Kitamura Yoshiro| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1969-09-01 |
| 巻 | 4巻 |
| 号 | 1号 |
| 開始ページ | 57 |
| 終了ページ | 64 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307482 |
| JaLCDOI | 10.18926/15671 |
|---|---|
| フルテキストURL | 009_02_107_118.pdf |
| 著者 | Okamoto Takuji| Misaki Takayoshi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1974-12-25 |
| 巻 | 9巻 |
| 号 | 2号 |
| 開始ページ | 107 |
| 終了ページ | 118 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307235 |
| JaLCDOI | 10.18926/15667 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_9_2_53.pdf |
| 著者 | Torii, Sigeru| Tanaka, Hideo| Mandai, Tadakatsu| |
| 抄録 | This paper deals with graphical mass spectral data of the twentyfive compounds related to the preparation of methyl dl-jasmonate and its related materials. The fragmentations from the substituted cyclopentanones and norbornane derivatives can serve basic data for both characterization and elucidation of the structures of complex compounds referring to the preparation of principal components of jasmine flower. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1974-12-25 |
| 巻 | 9巻 |
| 号 | 2号 |
| 開始ページ | 53 |
| 終了ページ | 61 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307121 |