result 1160 件
| Author | Soda, Ryo| |
|---|---|
| Published Date | 1981-12-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume93 |
| Issue | issue11-12 |
| Content Type | Journal Article |
| Author | Sato, Toshio| |
|---|---|
| Published Date | 1984-12-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume96 |
| Issue | issue11-12 |
| Content Type | Journal Article |
| Author | Araki, Kumiko| |
|---|---|
| Published Date | 1984-04-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume96 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Kurata, Noriyuki| |
|---|---|
| Published Date | 1983-04-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume95 |
| Issue | issue3-4 |
| Content Type | Journal Article |
| Author | Tanizaki, Yoshiro| |
|---|---|
| Published Date | 1985-10-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume97 |
| Issue | issue9-10 |
| Content Type | Journal Article |
| Author | Goda, Yoshinori| |
|---|---|
| Published Date | 1985-06-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume97 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Kawakami, Tetsuo| |
|---|---|
| Published Date | 1987-08-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume99 |
| Issue | issue7-8 |
| Content Type | Journal Article |
| Author | Akao, Masaki| |
|---|---|
| Published Date | 1988 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume100 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Nose, Sohichiro| |
|---|---|
| Published Date | 1988 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume100 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/15785 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_1_33.pdf |
| Author | Taniguchi Takeo| Soga Akira| |
| Abstract | Numerical error in the solution of the band matrix method based on the elimination method in single precision is investigated theoretically and experimentally, and the behaviour of the truncation error and the roundoff error is clarified. Some important suggestions for the useful application of the band solver are proposed by using the results of above error analysis. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-11-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 33 |
| End Page | 44 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307352 |
| JaLCDOI | 10.18926/15736 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_15.pdf |
| Author | Ishihara Yoshiyuki| Takahashi Norio| |
| Abstract | Characteristics of iron losses in silicon steel due to inclined rotating fluxes and distorted ones are described. Iron losses due to rotating fluxes have been measured at various conditions for grain-oriented and non-oriented silicon steels by using an improved thermistor-bridge method. Loss measurements indicate that the iron loss due to the inclined rotating flux is greater than that due to the non-inclined one. However, the iron loss due to the distorted rotating flux is not always greater than that due to the non-distorted one. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 28 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307734 |
| JaLCDOI | 10.18926/15731 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_12_97.pdf |
| Author | Kono Iichiro| Nishigaki Makoto| |
| Abstract | The solutions of unsteady phreatic flow toward a partially penetrating well in an aquifer of finite thickness are described. Firstly the solution for a confined aquifer is shown. In this case,three methods of analyzing field data with partially penetrating well are given, that is, "Log-Log Method, Log-Log Distance Drawdown Method and Jacob's Method Ajusted for Partial Penetration". By using these methods the hydraulic conductivities and the specific storage of the aquifer may be determined. Secondly the solution for an,unconfined aquifer is shown. In this case, also two methods of analyzing field data with partially penetrating well are given. By using these methods, the anisotropic permeability and the storage coefficient (effective porosity) of the aquifer may be determined. Moreover in each case, the effects of partial penetration are discussed and the limits of adapting the Theis' and Jacob's methods are setted. From these analytic results, some cosiderations are added to determine the anisotropy of permeability and to evaluate the storage coefficient. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1978-02-25 |
| Volume | volume12 |
| Start Page | 97 |
| End Page | 128 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307830 |
| JaLCDOI | 10.18926/15728 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_225.pdf |
| Author | Kaneda Masahiro| Shinji Hiroshi| Aoyama Mikio| |
| Abstract | This paper deals with the adaptive observer which estimates the states and parameters of unknown system. It is shown that the adaptive observer problem is reduced to the identification of the transformation matrix for an arbitrary designable observer. Moreover, the adaptive process of the unknown parameters is reduced to the linear optimal regulator problem. As the result, a new method is presented to obtain an appropriate adaptive process with good insight. And, in this identification, a linear filter is found to be also useful against noises in input-output data. To achieve high accuracy, a particular nonlinear filtering can improve SN ratio only in the direction of the unknown vector. Even if SN ratio of input-output data has zero dB, sufficient accuracy can be accomplished within suitable correction time. This design algorithm seems to be rather straightforward and practical. Since input sequence is required to be only sufficiently general, the method is applicable to on-line identification also. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 225 |
| End Page | 238 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307984 |
| JaLCDOI | 10.18926/15725 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_12_59.pdf |
| Author | Ohta, Mutsuo| Kanadani, Teruto| Sakakibara, Akira| |
| Abstract | Several Al-Zn alloys containing 0.041-4.4 at % Zn were studied by means of measurements of electrical resistivity. The results obtained are as follows : (1) The electrical resistivity increases when the specimen is annealed at temperatures higher than the solvus temperature of the G.P. zones. The increase of the resistivity is due to the formation of fluctuation. (2) The electrical resistivity of the specimen containing fluctuation is dependent upon annealing temperature only and independent of quenching temperature. (3) The fluctuation is formed in very dilute alloys as 0.041 at % Zn at temperatures higher than the solvus temperature of the G.P. zones. (4) The formation energy of vacancy and the migration energy of the Zn atom in the alloys determined by the formation process of fluctuation are in good agreement with those by the formation process of G.P. zones. (5) In spite of the result (4), it seems that the fluctuation is not the same as the small G.P. zones which are observed in the early stage of aging. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1978-02-25 |
| Volume | volume12 |
| Start Page | 59 |
| End Page | 75 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307636 |
| JaLCDOI | 10.18926/15723 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_195.pdf |
| Author | Sano, Hiroya| Koga, Ryuji| Tanada Yoshihiro| Kosaka, Megumi| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 195 |
| End Page | 207 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307857 |
| JaLCDOI | 10.18926/15721 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_12_53.pdf |
| Author | Fujitsuka Takeshi| Agusa Toru| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1978-02-25 |
| Volume | volume12 |
| Start Page | 53 |
| End Page | 58 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307552 |
| JaLCDOI | 10.18926/15720 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_12_45.pdf |
| Author | Himei Toyoji| Nakanishi Senichiro| Funabiki Shigeyuki| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1978-02-25 |
| Volume | volume12 |
| Start Page | 45 |
| End Page | 52 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307334 |
| JaLCDOI | 10.18926/15719 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_163.pdf |
| Author | Tanada Yoshihiro| Sano Hiroya| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 163 |
| End Page | 180 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307519 |
| JaLCDOI | 10.18926/15704 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_65.pdf |
| Author | Ushio Junichi| Osaki Hirokazu| Kikuchi Susumu| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 65 |
| End Page | 81 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307987 |
| JaLCDOI | 10.18926/15702 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_13_53.pdf |
| Author | Funabiki Shigeyuki| Nakanishi Senichiro| Himei Toyoji| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-03-05 |
| Volume | volume13 |
| Start Page | 53 |
| End Page | 64 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307832 |
