検索結果 2449 件
| JaLCDOI | 10.18926/15794 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_2_13.pdf |
| 著者 | 古賀 隆治| Kosaka, Megumi| Sano, Hiroya| |
| 抄録 | A quasi-random method for spectral scanning is proposed to reduce an alias response to a quick change in the source abundance. A direct application is made for an atmospheric methane monitoring with a current-tunable diode laser. Only barrel shift methods are examined being found further vulnerable to drifting etalon fringes. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1985-02-25 |
| 巻 | 19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 | 120002308000 |
| JaLCDOI | 10.18926/15793 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_16_1_47.pdf |
| 著者 | Mori Chuji| Hattori Susumu| Tanabe Hiroshi| |
| 抄録 | A practical example of digital rectification of tilted photographs using a drum scanning micro densitometer and general purpose computers is depicted. The present research covers rectification of projective distorsions, occuring when the camera axis is not truly vertical, and affine distorsions due to curvature of a drum of a scanner. For this purpose, fundamental mathematical expressions were derived. And some pixel interpolation methods necessary for image reconstruction were compared experimentally. The examples revealed, however, that the film was deformed so complexly that they could not be corrected sufficiently only by affine transformation. Accuracy of rectification was checked by use of stereo aerial photographs in terms of residual y-parallaxes. The result showed residual y-parallaxes of ± 1 pixel (± 50 μm) and sometimes ± 2 pixels were observed. They seem to be caused mainly by film deformations which have not been eliminated, and their amount seems to exceed the photogrammetric tolerance. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1982-03-01 |
| 巻 | 16巻 |
| 号 | 1号 |
| 開始ページ | 47 |
| 終了ページ | 64 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307893 |
| JaLCDOI | 10.18926/15785 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_1_33.pdf |
| 著者 | Taniguchi Takeo| Soga Akira| |
| 抄録 | 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. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1984-11-26 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 33 |
| 終了ページ | 44 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307352 |
| JaLCDOI | 10.18926/15783 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_19_1_13.pdf |
| 著者 | Nago Hiroshi| Maeno Shiro| |
| 抄録 | In this paper the theoretical method to analyse the pore water pressures in the sand bed under the oscillating water pressure is developed. In the former researchs the validity of the theoretical treatment for the one-dimensional problem has been verified. However, the one-dimensional treatment is not sufficient to obtain the precise informations concerning the many practical problems. From this point of view, in this study, we derive the fundamental equations for the general three-dimensional sand layer under the oscillating water pressure. The validity of this theoretical method is verified by experiments for the twodimensional problems. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1984-11-26 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 13 |
| 終了ページ | 32 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307347 |
| JaLCDOI | 10.18926/15774 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_18_1_91.pdf |
| 著者 | Sano, Hiroya| 古賀 隆治| Kosaka, Megumi| Wake, Ichiro| |
| 抄録 | This paper presents an optical-waveform synthesizer as one of the applications of optical bistable devices. This device is advantageous in terms of faster operation in which width of each pulse obtained is down to the order of subnanosecond, because this device employs both GaAs- and Si-optoelectronic switches as photodetector. Optical pulse shaping as a preliminary experiment is also described. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1984-03-30 |
| 巻 | 18巻 |
| 号 | 1号 |
| 開始ページ | 91 |
| 終了ページ | 100 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307204 |
| JaLCDOI | 10.18926/15772 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_15_2_55.pdf |
| 著者 | Hida Moritaka| Matsumori Nobuo| Terauchi Hikaru| |
| 抄録 | X-ray diffuse scatteing intensity measurement has been carried out for the Al-3,82% Cu single crystal in which GP (2) zones are found. The two dimensional equiintensity contour maps in h(1) h(2) 0 plane are obtained from surveying around several reflections. The diffuse intensity around 2 1 0 reflection, which shows a cross like streak, is carefully examined. Warren-Cowley short-range order parameters, a(i), are estimated from the diffuse intensities around 2 1 0 reflection. The component of the intensities coming from atomic displacements was subtracted from the total diffuse intensity. It is found that the equi-intensity contours after the correction of the atomic displacements shows an anisotropic distribution and the GP(2) zone is an ellipsoid with a modified layer structure. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1981-03-30 |
| 巻 | 15巻 |
| 号 | 2号 |
| 開始ページ | 55 |
| 終了ページ | 67 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307124 |
| JaLCDOI | 10.18926/15770 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_15_2_29.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| 榊原 精| Yamada, Masuo| |
| 抄録 | Measurements of electrical resistivity and intensity of small-angle X-ray scattering and transmission electron microscopy were made on Al-Zn alloys of several compositions. G.P. zones are formed by the nucleation-and-growth mechanism above the spinodal temperature. The nucleus has a critical size for growth. This size becomes larger when aged at higher temperatures. The sizes of the G.P. zones formed by this mechanism distribute broadly, but those formed by the spinodal decomposition do closely. The spinodal temperatures estimated for Al-10.0, 12.5, 15.0, and 20.0wt % Zn alloys are ~95, ~110, ~130, and ~180℃, respectively. The critical temperatures below which G.P. zones are observed in these alloys are ~115, ~135, ~160, and ~210℃, respectively. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1981-03-30 |
| 巻 | 15巻 |
| 号 | 2号 |
| 開始ページ | 29 |
| 終了ページ | 53 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307895 |
| JaLCDOI | 10.18926/15769 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_15_2_21.pdf |
| 著者 | Akagi Fumio| Osaki Hirokazu| Kikuchi Susumu| |
| 抄録 | An assembly line with no paralleling of work elements and work stations is called a serial line. The cycle time of the serial line must be at least equal to the maximum work element time. To lower the cycle time beyond the limit and increase the production rate, one may permit the paralleling of work elements or work stations. So in this paper we propose the parallel assignment method for achieving a higher production rate. In this method, work elements are assigned to work stations under the multiple upper time limits which are the products of the various numbers of workers and the limiting cycle time. Further we develop the computer program of the proposed method and provide an illustrative problem and computational results. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1981-03-30 |
| 巻 | 15巻 |
| 号 | 2号 |
| 開始ページ | 21 |
| 終了ページ | 28 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307495 |
| JaLCDOI | 10.18926/15768 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_18_1_57.pdf |
| 著者 | Ohzuku Tsutomu| Sawai Keijiro| Hirai Taketsugu| |
| 抄録 | Basic kinetic equations of chronopotentiometric potential-time curves, in which the equations for reversible, quasi-reversible and irreversible electron transfer process appeared in special cases, were given and a chronopotentiometric method for determining kinetic parameters was proposed therefrom. The method was demonstrated for Fe(3+)/Fe(2+) redox reaction in acidic aqueous media. The limitations of the method and the double-layer charging effects on the potential-time curve were discussed. The extension of the method to more general electrode processes was also considered. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1984-03-30 |
| 巻 | 18巻 |
| 号 | 1号 |
| 開始ページ | 57 |
| 終了ページ | 73 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307985 |
| JaLCDOI | 10.18926/15762 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_18_1_1.pdf |
| 著者 | Nakata Takayoshi| Takahashi Norio| |
| 抄録 | The quantitative analysis of localized flux distributions in transformer cores has become easy through the progress of numerical field calculations. In this paper, the effects of core constructions, joint configurations, magnetizing characteristics of materials on the flux distributions are examined using newly developed techniques such as a gap element, an approximate method for solving three-dimensional magnetic fields, the time periodicity finite element method, an efficient technique for treating hysteresis characteristics and so on. A method for the optimum design of transformer cores is also discussed. Main results obtained can be summarized as follows: (a) The building factor of the core made of higely-oriented silicon steel is larger than that of the conventional core. (b) The iron losses at joints are much affected by overlap lengths, number of laminations per stagger layer and a small irregularity of the arrangement of sheets. (c) It is clarified that examinations of the optimum construction of core and the most desirable magnetic characteristics of core material are possible using the finite element method. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1984-03-30 |
| 巻 | 18巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 31 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307976 |
| JaLCDOI | 10.18926/15761 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_15_1_79.pdf |
| 著者 | Morikawa, Yoshitaka| Hamada, Hiroshi| |
| 抄録 | Two variational formulations for electromagnetic field and charged-particle stream configurations, in which both field and particles are described by the field-like variables suited for the problems of electrodynamics, are presented. One of them is directly obtained through slight modifications of Sturrock's original procedure but has a complicated form. The other is obtained through linearization of the preceding one and has a compact form. Both formulations lend themselves to straightforward derivation of the well-known energy-momentum tensor and/or its conservation law. Specifically the latter one is of academic interest because of its compact form. Moreover, as a proof of its practical usefulness the variational principle under the small-amplitude approximation is derived from it, which is known to provide a basis for the study of certain types of instability in plasmas. It is, however, hoped that it will find main applications in the electrodynamics problems concerned with large-amplitude behavior. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1980-11-29 |
| 巻 | 15巻 |
| 号 | 1号 |
| 開始ページ | 79 |
| 終了ページ | 100 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307937 |
| JaLCDOI | 10.18926/15753 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_15_1_17.pdf |
| 著者 | Yamamoto Yoshitake| Yamamoto Tatsuma| |
| 抄録 | In the case of non-invasive measurement of bioelectric potential from body surface, the influence of the skin impedance has been investigated by using strict equivalent circuits of skin impedances. The relationship between the characteristic of skin impedance and the wave distortion was made clear. Furthermore, in the case of electrocardiograph, the shift potential of indifferent electrode to standard potential was obtained by means of simulation, and the distortions caused by connective resistances of a central terminal and skin impedance were quantitatively explained. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1980-11-29 |
| 巻 | 15巻 |
| 号 | 1号 |
| 開始ページ | 17 |
| 終了ページ | 28 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307780 |
| JaLCDOI | 10.18926/15749 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_2_73.pdf |
| 著者 | Kono Iichiro| Nishigaki Makoto| |
| 抄録 | This paper deals with the experimental study of hydraulic properties of unsaturated soil. In treating unsaturated zone, a great deal more data are required than are required for the saturated zone, but these properties of soils must be known to apply the finite element approach to actual groundwater flow problems. The purposes of this paper are to propose a rational basis of getting experimental relationships between prossure head() and hydraulic conductivity(K) and between pressure head() and volumetric moisture content(θ) with "the instantaneous profile method" in a laboratory. An apparatus was constructed and test procedures were developed to measure pressure head and volumetric moisture content by using pressure transducers and low-energy gamma ray attenuation. The technique of a low-energy gamma radiation apparatus does provide a means for accurate measurement of water content without disturbing the system into which water is moving. Furthermore rapid measurement of water content becomes possible at any position in a soil so that water content changes with time may easily be followed. The tensiometer~transducer system provides a most valuable means of measuring pressure head with rapid response and with provision of a complete record of the pressure head changes with time. |
| 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 | 73 |
| 終了ページ | 110 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307379 |
| JaLCDOI | 10.18926/15748 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_2_53.pdf |
| 著者 | Nishigaki Makoto| Kono Iichiro| |
| 抄録 | The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone, and to present the fundamentals of the theory of groundwater flow. This paper discusses the physics of the saturated-unsaturated groundwater motion. Evaluations confirm the early belief that Darcy's law is of the nature of statistical result giving the empirical equivalent of Navier-Stokes equations. The governing equation of saturated-unsaturated flow in porous media is derived from the law of mass conservation and from the Darcy's law and Richard's equation of motion and is compared with the Klute's diffusion equation which has been widely used in the analysis of unsaturated flow. As a result; it is concluded that the governing equation has the advantage that can be applied for the whole flow region. Typical boundary conditions are enumerated. |
| 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 | 53 |
| 終了ページ | 72 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307170 |
| JaLCDOI | 10.18926/15744 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_95.pdf |
| 著者 | Nishigaki Makoto| Kono Iichiro| |
| 抄録 | In order to apply the numerical method to practical groundwater flow problem in the field, the hydraulic properties must be estimated. In this paper, new methods of analyzing drawdown tests were developed and illustrated with some examples to determine hydraulic properties of aquifer. Drawdown tests sometimes have to be performed near the boundary of the aquifer or in the much groundwater supplied aquifer. In such instances, the assumption that the aquifer is of infinite areal extent is no longer valid. Therefore the analytical solutions of unsteady flow due to drawdown test are derived in the conception of "Island Model" that the shape of groundwater level is fixed by the circular water supply which is equilibrium with the pumping rate. By using these solutions, new methods of analyzing drawdown tests which are performed in a confined aquifer and an unconfined aquifer were given respectively and the effect of influence region was evaluated. The example analysis to determine permeability and storage coefficient were shown. As the results,the propriety of the solutions is verified comparing the analytical results with the drawdown test data taken from a real aquifer project. |
| 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 | 95 |
| 終了ページ | 126 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307822 |
| JaLCDOI | 10.18926/15742 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_14_1_61.pdf |
| 著者 | Kono Iichiro| Nishigaki Makoto| |
| 抄録 | The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone and to develop the most effective methods for solving groundwater flow problems related to civil engineering practice. The mathematical model provides a finite element solution to two- or threedimensional problems involving transient flow in the saturated and unsaturated domains of nonhomogeneous, anisotropic porous media. Before progressing into the various levels of applications the input data and boundary conditions are discussed and evaluated. To demonstrate the flexibility of the finite element approach and its capability in treating complex situations which are often encountered in the field, the groundwater flow through sand bank at flood water levels and the flow through aquifer due to an excavation were analyzed. As the results there were good qualitative agreements between the numerical results and the informations received. |
| 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 | 61 |
| 終了ページ | 94 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307580 |
| 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 | 10.18926/15728 |
|---|---|
| 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 | 10.18926/15725 |
|---|---|
| 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 |