検索結果 47530 件
| JaLCDOI | 10.18926/15741 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_2_13.pdf |
| 著者 | 古賀 隆治| Ebara, Masami| Kosaka, Megumi| Sano, Hiroya| |
| 抄録 | A switch element has been developed so that a kilovolt step voltage should be supplied to a 50Ω transmission line with a subnanosecond rise time. The element is of silicon substrate with high purity and a pair of electrodes is attached by the evaporation process. The switch action is performed by the photoconductivity produced by the laser light pulse. This paper deals with a preliminary analysis, manufacturing processes and experimental results of the optoelectronic switch. A performance of 320V output with less than 4 ns risetime was obtained with sufficient persistence for more than 2×10(5) pulse shots. This switch was successfully applied to an optical waveform monitor for laser light pulses giving a resolution less than 2 ns. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1980-03-01 |
| 巻 | 14巻 |
| 号 | 2号 |
| 開始ページ | 13 |
| 終了ページ | 22 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307887 |
| JaLCDOI | 10.18926/15740 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_55.pdf |
| 著者 | 古賀 隆治| Hirao, Keiji| Kosaka, Megumi| Sano, Hiroya| |
| 抄録 | An absorption spectrum of γ-0 band of nitric monoxide of very dilute density was taken. An experimental electronic device showed a distinguishing power of 0.01 ppm through 10 m optical pathlength. By the aid of a data processing based on a principle developed by the authors, this sensitivity does not suffer from coexisting sulfur dioxide, which shares the absorption band with the nitric monoxide. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-12-01 |
| 巻 | 14巻 |
| 号 | 1号 |
| 開始ページ | 55 |
| 終了ページ | 60 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307855 |
| JaLCDOI | 10.18926/15739 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_39.pdf |
| 著者 | Nogi, Shigeji| Fukui, Kiyoshi| |
| 抄録 | Some behaviors of a lattice soliton in nonlinear L-C ladder lines with abrupt parameter change are investigated. The results of computer and circuit experiments show that in the case of a soliton incident upon the line of larger characteristic impedance and of higher phase velocity in linearized-line-limit, the transmitted wave evolves into larger number of solitons. The experimental results can be well explained by use of both linearization approximation for the line near the junction and the theory by Gardner, Greene, Kruskal and Miura. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-12-01 |
| 巻 | 14巻 |
| 号 | 1号 |
| 開始ページ | 39 |
| 終了ページ | 53 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307868 |
| JaLCDOI | 10.18926/15738 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_29.pdf |
| 著者 | Wada Tsutomu| Shimizu Akira| Dohta Shujiro| |
| 抄録 | Effect of the geometrical configuration of wall-reattachment fluidic device on the switching dynamics, the switching time, and its dispersion, was investigated experimentally by using a large scale model. The results obtained can be summarized as follows: 1) The switching time, its dispersion, and switching probability depend upon the connection of the input to the control port. 2) Effect of the vent and splitter on the jet in dynamic switching is explained commonly by using the margin of a given control flow rate to the switching control flow rate. 3) The switching time ,decreases as input increases, whereas its dispersion remains constant except for small input. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-12-01 |
| 巻 | 14巻 |
| 号 | 1号 |
| 開始ページ | 29 |
| 終了ページ | 37 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307477 |
| JaLCDOI | 10.18926/15737 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_2_1.pdf |
| 著者 | Wada Masayuki| Ogawa Kazuo| Akagi Fumio| Osaki Hirokazu| Kikuchi Susumu| |
| 抄録 | The assumption that vocational aptitude changed with age and with the kind of occupation was examined from the tendency of the fitted curve for the score of the aptitude test. 9 vocational aptitudes were measured by the general vocational aptitude test by Japan Labor Ministry. Subjects were 382 male workers (design engineers, turners, welders, can manufacturing workers, and crane operators) of from 20 to 59 years old, and 348 male and female students (junior high school, vocational school, and university) of from 15 to 19 years old. The design engineers' aptitudes advanced along the quadratic curve until 31 years old, but almost all the aptitudes of the other workers fell along the linear curve with age. The design engineers preserved various aptitudes until 52 years old, the turners 44, and the welders, the can manufacturing workers, and the crane operators 37. The students' aptitudes were equal to those of the workers of from 15 to 25 years old. The workers preserved Spatial aptitude and Numerical aptitude until 45 years old. This could be said in all the occupations here. Further it was made clear from the micromotion study that the influence of age was caused by therbligs |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1980-03-01 |
| 巻 | 14巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 12 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307217 |
| JaLCDOI | 10.18926/15736 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_15.pdf |
| 著者 | Ishihara Yoshiyuki| Takahashi Norio| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-12-01 |
| 巻 | 14巻 |
| 号 | 1号 |
| 開始ページ | 15 |
| 終了ページ | 28 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307734 |
| JaLCDOI | 10.18926/15735 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_9.pdf |
| 著者 | Fujiwara Yasuo| Monobe Kazuo| |
| 抄録 | In the course of the study of polymer crystallization at high pressure, oriented crystallization of extended chain crystals of polyethylene were examined. Molten polyethylene were extruded into a die at a few hundred atm, and follwed by crystallization by high pressure application above 3000 atm. Resulting sample shows chain orientation to extruded direction. Thick lamella nearly a few thousand angstrom, which are typical feature of high pressure crystallization, were observed to be stacked parallel each other. In spite of favorable condition for crystals to grow to chain direction, remarkable growth to normal direction to them were also observed. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-12-01 |
| 巻 | 14巻 |
| 号 | 1号 |
| 開始ページ | 9 |
| 終了ページ | 14 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307317 |
| JaLCDOI | 10.18926/15734 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_1.pdf |
| 著者 | Yamashita Yuhiko| Monobe Kazuo| |
| 抄録 | The molecular mechanism of chain tilt in poly(ethylene terephthalate) (PET) fibers was proposed. The mechanism was considered basing on the ordering process from the cold drawn state of glassy PET. It was confirmed that the direction of maximum contraction on ordering agrees with the azimuth of chain tilt which varies with annealing temperature. In the stacking structure of irregular folded chain blocks of cold drawn PET, the expansion to the chain direction and the contraction to the lateral direction yield the compressive stress and tensile stress r respectively. The stress revealed as the result of the ordering from the glassy structure to crystalline structure can be relaxed by the rotation of the resulting crystallites. Therefore, we can suggest that the chain tilt is caused by the relaxation process of the stress. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-12-01 |
| 巻 | 14巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 7 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307641 |
| JaLCDOI | 10.18926/15733 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_129.pdf |
| 著者 | Myojin Syo| Tatsuta Akira| Taka Yasuhisa| Asai Kazuhiko| |
| 抄録 | A statistical analysis is applied to find what states of "block" are dangerous from view point of traffic accident. Here, the block is defined to be an area surrounded by some major streets and is feeded by a minor street network. The accidents under study are those which occur in the whole minor street network. They are grouped into three kinds; pedestrian, vehicle and the gross accidents. And each is classified to three types according to the place where the accident occurs. At the beginning 22 variables are assumed to state a certain relationship of some states of the block with the occurrences of accidents and 12 variables are found significant finally through factor analysis. Further examination has reached several key variables that migth have something significant to cause traffic accidents in the block. The key ones are the number of lanes of street and the number of legs of intersection, especially nearly 2 lanes street and 3-leg intersection, respectively. The case study was carried out on 26 blocks sampled from Osaka City. |
| 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 | 129 |
| 終了ページ | 139 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307311 |
| JaLCDOI | 10.18926/15732 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_249.pdf |
| 著者 | Yamamoto Kyoji| |
| 抄録 | The asymptotic theory of Rayleigh shear flow for large values of time is developed on the basis of the linearized Boltzmann-Krook equation. Asymptotic equations for mean velocity outside the Knudsen layer are obtained by employing the Hilbert expansion. Slip boundary conditions are derived from the analysis of the Knudsen layer adjacent to the wall. A solution of the asymptotic equation is obtained under the slip boundary condition and zero initial condition. Discussions are also made of the flow induced by a slowly oscillating flat plate. |
| 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 | 249 |
| 終了ページ | 258 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307963 |
| JaLCDOI | 10.18926/15731 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_97.pdf |
| 著者 | Kono Iichiro| Nishigaki Makoto| |
| 抄録 | 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. |
| 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 | 97 |
| 終了ページ | 128 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307830 |
| JaLCDOI | 10.18926/15730 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_89.pdf |
| 著者 | Totsuji Hiroo| |
| 抄録 | The pair correlation function and the correlation energy density of two-dimensional electron liquids are calculated on the basis of the Salpeter's Debye-chain type expansion. When the two-dimensional plasma parameter (£=2πne4T-2) is small, the expansion to the first order gives the correlation energy to the order of (£21n£). It is shown that experimental results in the domain (£<0.5) can be reproduced by taking into account the first and the second order terms in this expansion. |
| 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 | 89 |
| 終了ページ | 96 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307196 |
| JaLCDOI | 10.18926/15729 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_239.pdf |
| 著者 | Taniguchi Takeo| |
| 抄録 | In this paper the minimum fill-in problem which arises at the application of the sparse matrix method for linear sparse systems is discussed from the graphtheoretic viewpoint and the author gives some results which can be directly introduced in the design of, so called, the optimal elimination ordering algorithm which gives the minimum fill-in(the number of zeros in coefficient matrix which become non-zero during the elimination process). Through this investigation only graphs are treated instead of the coefficient matrices for linear systems, and the elimination process for a matrix is equivalated to the vertx eliminations for the graph. Then, the results by the theoretical investigation are summarized as following: 1. Optimal elimination for each subgraph which is subdivided appropriately from whole graph leads to the global optimum. 2. In each subgraph there are only two kind of eliminations. Furthermore, some numerical experiments show the characteristics of the subset of vertices, which subdivide a subgraph from the residual. |
| 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 | 239 |
| 終了ページ | 248 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307617 |
| JaLCDOI | 10.18926/15728 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_225.pdf |
| 著者 | Kaneda Masahiro| Shinji Hiroshi| Aoyama Mikio| |
| 抄録 | 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. |
| 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 | 225 |
| 終了ページ | 238 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307984 |
| JaLCDOI | 10.18926/15727 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_77.pdf |
| 著者 | Ohta, Mutsuo| Kobayashi, Toshinori| 榊原 精| |
| 抄録 | The clustering phenomenon was observed when dilute Al-Zn alloys were annealed at temperatures higher than the solvus of the G.P.zones. In this report the apparent activation energy for clustering is estimated and compared with the experimental results. The estimated value of the apparent activation energy for clustering in several Al-Zn alloys comes to 0.51 eV, which is larger than the effective migration energy 0.43 eV of Zn atoms in Al-Zn alloys. |
| 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 | 77 |
| 終了ページ | 88 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307178 |
| JaLCDOI | 10.18926/15726 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_219.pdf |
| 著者 | Totsuji Hiroo| Kakeya Hideyuki| |
| 抄録 | The dynamic form factor and the dispersion relation of the plasma oscillation of two-dimensional classical systems of electrons with ordinary Coulomb interaction are obtained by numerical experiments in the domain of the plasma parameter 2.24≤√=(πn)(1/2)e(2)/T≤70.7, where n, e, and T are the areal number density, the electronic charge, and the temperature in energy units, respectively. |
| 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 | 219 |
| 終了ページ | 224 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307942 |
| JaLCDOI | 10.18926/15725 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_59.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| 榊原 精| |
| 抄録 | 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. |
| 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 | 59 |
| 終了ページ | 75 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307636 |
| JaLCDOI | 10.18926/15724 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_209.pdf |
| 著者 | Totsuji Hiroo| |
| 抄録 | Exact lower bounds are given for thermodynamic quantities of ionic mixtures in the uniform background in d dimensions with three-dimensional (1/r) Coulomb interaction (d=2 and 3) and with d-dimensional Coulomb interaction (d=1, 2, and 3). It is shown that these lower bounds improve upon known ones and give values close to experimental results which are available in the case of d=3. |
| 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 | 209 |
| 終了ページ | 218 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307762 |
| 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 |