検索結果 416 件
| JaLCDOI | 10.18926/15723 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_195.pdf |
| 著者 | Sano, Hiroya| 古賀 隆治| Tanada Yoshihiro| Kosaka, Megumi| |
| 抄録 | The maximally attainable accuracy of an airpollution monitoring system is investigated. The system is composed of a tunable pulsed dye laser as the light source, photodiodes as the opto-electric converter and a low noise electronic signal processor specifically designed by the authors. The extreme value of the accuracy is given in terms of the standard deviation of the attenuation. The value is 3.4×10(-4)[Nep√(pulse number)] for an averaged value for multiple laser shots. Also the wavelength reproduceability of a dye laser was examined, which resulted in that a computer should take a part in the wavelength control in order that this method should be feasible. |
| 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 | 195 |
| 終了ページ | 207 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307857 |
| JaLCDOI | 10.18926/15722 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_181.pdf |
| 著者 | Sano, Hiroya| 古賀 隆治| Tanada, Yoshihiro| Kosaka, Megumi| |
| 抄録 | This report deals with a notion of adjoint spectrum which is applicable to air-pollution monitoring by using pulsed lasers. Both Raman and absorption spectra of multiple gas complex are linear combinations of the spectra, each of which is specific to a gas species and its magnitude is proportional to the density. An extended formulation of the method of least squares is made in terms of a new notion, adjoint spectra, which visualizes the structure of the numerical filter. Applications of the derived numerical filters to the two methods are shown and features are described about the synthesized filters. |
| 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 | 181 |
| 終了ページ | 193 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307476 |
| JaLCDOI | 10.18926/15721 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_53.pdf |
| 著者 | Fujitsuka Takeshi| Agusa Toru| |
| 抄録 | In recent years, the development of a high power transistor element is proceeding. A high power inverter circuit using power transistors are finding a good number of applications in induction heating and melting. Turn off time of power transistors occupies 5-lOμs of switching characteristics. A driving method to give base inputs for a half period is widely used for a inverter circuit. But this method has the following defects, the short-circuit current flows through two transistors because the other pair transistors turn on before one pair transistors turn off. So the switching loss is increased, the maximum output and the efficiency are decreased. In this paper, a driving method to give base inputs for the less period as compared with a half period is discussed. Using this method, the foregoing defects is lost and the driving frequency is able to become higher. In addition, it become clear that the square waveform output is given using this method in the case of R-L load. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1978-02-25 |
| 巻 | 12巻 |
| 開始ページ | 53 |
| 終了ページ | 58 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307552 |
| JaLCDOI | 10.18926/15720 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_45.pdf |
| 著者 | Himei Toyoji| Nakanishi Senichiro| Funabiki Shigeyuki| |
| 抄録 | In this paper, an AC chopper circuit, using a power transistor, is described which chops the AC voltage with a commercial frequency. The circuit is composed of a diode bridge and a power transistor in series with a load and capable of adjusting the switching frequency, fc, and the time ratio, T=ton/(ton+toff). The switching frequency and the time ratio of the AC chopper circuit depend on switching-times, that is, delay time, rise time, carrier storage time and fall time, especially in the high frequency. The upper limit of the switching frequency (about 150kHz) and the output characteristics of the circuit are investigated. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1978-02-25 |
| 巻 | 12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 | 120002307334 |
| JaLCDOI | 10.18926/15719 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_163.pdf |
| 著者 | Tanada Yoshihiro| Sano Hiroya| |
| 抄録 | A new waveform analyzer based on the Walsh transform is developed and is applied to a real-time filtering of fast pulse signals, and the linear filterings of time signals through the Walsh transform is discussed. The analyzer converts a solitary waveform during 16 μs into the 16 Walsh amplitude spectra in a hybrid manner: it has the sequency band from 62.5 kzps to 500 kzps. The spectra are parallelly held during 16 μs by analog integrators, while serially displayed by the CRT, and one of them is digitally read out. The spectra of the test waves are measured within the error rate of several per cent. The analyzer is applied to the correlative detection of the photoelectric pulse signals in a gasspectroscopic system using a pulse laser, and there composes the matched filter, which is useful for measuring the signals superposed by Gaussian noises with a high accuracy. For the real-time filtering of fast signals, the arithmetic convolution and the frequency power spectra are approximated using the complex Walsh transform. These approximations are of practical use in 16 or 32 dimensions. Then, the matched filters for pulse peaking are given by the approximate convolution and by the dyadic convolution. |
| 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 | 163 |
| 終了ページ | 180 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307519 |
| JaLCDOI | 10.18926/15717 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_153.pdf |
| 著者 | Fukui, Kiyoshi| Nogi, Shigeji| Yamada, Masuo| Sakakibara, Akira| |
| 抄録 | 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. |
| 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 | 153 |
| 終了ページ | 162 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307532 |
| JaLCDOI | 10.18926/15716 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_29.pdf |
| 著者 | Yamamoto Tatsuma| Yamamoto Yoshitake| Nishida Hideki| Yasuhara Kiyotaka| |
| 抄録 | The distributed circuit properties based on pores in the etched aluminum oxide film of the electrolytic capacitor have been analysed by the mathematical equation. This paper proposes the selection and the determining method of the parameters appearing in the analysis. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1978-02-25 |
| 巻 | 12巻 |
| 開始ページ | 29 |
| 終了ページ | 36 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307968 |
| JaLCDOI | 10.18926/15715 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_133.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| Yamada, Masuo| 榊原 精| |
| 抄録 | 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. |
| 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 | 133 |
| 終了ページ | 152 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307468 |
| JaLCDOI | 10.18926/15714 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_23.pdf |
| 著者 | Yamashita Yuhiko| Monobe Kazuo| |
| 抄録 | A new realistic, structural model is proposed for the glassy solid state of poly(ethylene terephthalate) (PET). The model is considered basing on crystallization behaviors from the glassy state of PET, and in particular including the evidence from the estimation of chain folding energy in this report. When PET is quenched from its melt into the glassy state, irregular folds with lower conformational energy remain in glassy structure and disturb the three dimensional arrangement of the chains connected with the folds. In conclusion, we suggested that the structure of glassy PET is not in amorphous state which is represented by the interpenetrating random coil model, but in frozen metastable state which can be approached from the chain folded structure of polymer crystals. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1978-02-25 |
| 巻 | 12巻 |
| 開始ページ | 23 |
| 終了ページ | 28 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307771 |
| JaLCDOI | 10.18926/15713 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_2_51.pdf |
| 著者 | Inouye Hiroshi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1977-01-25 |
| 巻 | 11巻 |
| 号 | 2号 |
| 開始ページ | 51 |
| 終了ページ | 71 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307829 |
| JaLCDOI | 10.18926/15712 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_119.pdf |
| 著者 | Ohta, Mutsuo| Yamada, Masuo| Kanadani, Teruto| 榊原 精| |
| 抄録 | The effects of the fluctuation of solute concentration on the process of aging in Al-10wt % Zn alloy were studied by measurements of the intensity of small-angle X-ray scattering and by electron microscopy. Specimen was quenched from a higher temperature(T(Ql), mainly 300℃) to an intermediate temperature (T(Q2), 110~230℃), held there for a time, quenched again into iced water and aged isothermally at 0℃ or 40℃. Results obtained are as follows: (1) When the specimen was held at T(Q2) for a sufficient time and aged at relatively high temperatue(e.g. Ihr at 125℃ and aged at 40℃), a two-step increasing of both resistivity and integrated intensity was found. (2) Each of the steps has characteristics of the formation of G.P. zones by the spinodal decomposition. (3) When the maximum resistivity(p(max)) takes a minimum, Size distribution of the G.P. zones, estimated from the difference between Guinier and Porod radii, is much broader than that at p(max) in the usual direct quenching. (4) When the holding time at T(Q2) is long enough, the size distribution at p(max) is as broad as that at p(max) in the usual case. (5) After a prolonged aging under the condition that P(max) takes minimum, G.P. zones grow markedly and become oblate ellipsoidal with a major axis of about 20nm. (6) These results are consistently understood in terms of the fluctuation of solute concentration at T(Q2) and the change in the concentration of vacancies during annealing at T(Q2). That is, it is considered that these results are due to the difference in aging behavior between the regions of relatively high concentration and the ones of low concentration induced by the fluctuation. |
| 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 | 119 |
| 終了ページ | 132 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307931 |
| JaLCDOI | 10.18926/15711 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_2_37.pdf |
| 著者 | Kawara Osami| |
| 抄録 | In this paper, we compare ozone with chlorine regarding following respects; (1)Disinfection efficiency (2)Oxidation power (3)Effects of secondary effluents treated by ozone or chlorine on aerobic microorganisms. Both ozone and chlorine are powerfull oxidizing agents. However,those are greatly different from each other in effects of treatment. Ozone is superior to chlorine in oxidation of organics, perfection of disinfection and effects on aerobic microorganisms. On the other hand, chlorine is superior in disinfection of Coliform group bacteria. Based on these results,it may be concluded that chlorination will be effective in disinfection of effluents which do not contain so much contaminants. However in case of rather highly cotaminated effluents, ozonation will be suitable. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1977-01-25 |
| 巻 | 11巻 |
| 号 | 2号 |
| 開始ページ | 37 |
| 終了ページ | 49 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307819 |
| JaLCDOI | 10.18926/15710 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_2_27.pdf |
| 著者 | Nago Hiroshi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1977-01-25 |
| 巻 | 11巻 |
| 号 | 2号 |
| 開始ページ | 27 |
| 終了ページ | 36 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307779 |
| JaLCDOI | 10.18926/15709 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_95.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| Yamada, Masuo| 榊原 精| |
| 抄録 | 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. |
| 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 | 95 |
| 終了ページ | 117 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307526 |
| JaLCDOI | 10.18926/15706 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_83.pdf |
| 著者 | Akagi Fumio| Osaki Hirokazu| Kikuchi Susumu| |
| 抄録 | To assign work elements to the work stations in an assembly or manufacturing line, various computer programs have been developed and used. And it does that the number of stations or the cycle time is even given. But in practice it is desirable to obtain the assignment which shows the highest efficiency of line balancing under all possible combinations of the number of stations and the cycle time. Therefore we propose a computer program of the assignment method in which the efficiency of line balancing, Ebb and the number of stations, NN are regarded as variables. In this method the minimum value (EEb) of efficiency and the constant term (d) by which Ebb is reduced are given previously. And for any COmbination of Ebb (EE |
| 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 | 83 |
| 終了ページ | 93 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307716 |
| JaLCDOI | 10.18926/15705 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_1_31.pdf |
| 著者 | Inouye Hiroshi| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-07-20 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 31 |
| 終了ページ | 43 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307164 |
| JaLCDOI | 10.18926/15704 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_65.pdf |
| 著者 | Ushio Junichi| Osaki Hirokazu| Kikuchi Susumu| |
| 抄録 | We try to evaluate the manual work numerically from a point of view of the homogeneousness and the simultaneousness of both hands using the results of the micromotion study. The weighted coefficient and the balance index are used to evaluate the homogeneousness of both hands. And the simultaneous index is used to evaluate the simultaneous movement of both hands. It is necessary to make a program in order to use efficiently the method to calculate the indexes or the coefficients. Therefore the computer program of these methods is mentioned in this paper. |
| 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 | 65 |
| 終了ページ | 81 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307987 |
| JaLCDOI | 10.18926/15703 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_1_19.pdf |
| 著者 | 古賀 隆治| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-07-20 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 19 |
| 終了ページ | 30 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307572 |
| JaLCDOI | 10.18926/15702 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_53.pdf |
| 著者 | Funabiki Shigeyuki| Nakanishi Senichiro| Himei Toyoji| |
| 抄録 | An ac chopper circuit, which chops an ac voltage in a complete cycle for any lagging reactive load, is devised. The circuit is constructed of two ac-switches composed of power transistors and diodes. The load voltage is smoothly controlled by varying the time ratio of ac-switch. Transistors operate in a highfrequency chopping mode, thereby the ripples of the source current and the load current are easily filtered. Furthermore the input power factor of this model is better than that of the thyristor phase control circuit. In this paper, the construction and the driving method of this model are described. |
| 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 | 53 |
| 終了ページ | 64 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307832 |
| JaLCDOI | 10.18926/15701 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_1_7.pdf |
| 著者 | Ishii Tadao| Doi Mitsuharu| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-07-20 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 7 |
| 終了ページ | 18 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307614 |