result 989 件
| JaLCDOI | 10.18926/15794 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_2_13.pdf |
| Author | Koga, Ryuji| Kosaka, Megumi| Sano, Hiroya| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1985-02-25 |
| Volume | volume19 |
| Issue | issue2 |
| Start Page | 13 |
| End Page | 22 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002308000 |
| JaLCDOI | 10.18926/15793 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_16_1_47.pdf |
| Author | Mori Chuji| Hattori Susumu| Tanabe Hiroshi| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1982-03-01 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 64 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307893 |
| JaLCDOI | 10.18926/15792 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_2_1.pdf |
| Author | Yokoyama Fumiyoshi| Monobe Kazuo| |
| Abstract | The phase transition of urea complexes whose guest components range from n-paraffin to polyethylene was investigated by DSC thermal analysis. The transition temperatures increased with increasing the chain length; the related heats did not change much with the chain length. An X-ray powder diffractometry for urea-polyethylene complex revealed that the complex undergoes the same kind of phase transition between orthorhombic and hexagonal as urea-n-paraffin complex. The transition is interpreted in terms of an order-disorder transition with respect to the orientation of the guest molecule. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1985-02-25 |
| Volume | volume19 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 11 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307831 |
| JaLCDOI | 10.18926/15791 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_16_1_31.pdf |
| Author | Kaneda Masahiro| Akahori Ichiro| |
| Abstract | System data handling in CAD sY8tem for designing control systems is discussed. A man-oriented data description method for a wide sense block diagram and its automatical transformation into the state space description is proposed. This work is a part of CAD system: CADPACS-T which has been under development for designing control systems in our laboratory. The proposal data description for a wide sense block diagram has the following features: 1) to correspond nicety to the block diagram and to be suitable for a man-oriented expression, 2) to express even a large scale system compactly by partitioning into some subsystems defined externally, 3) to be easy to add /or alter the input-output terminals, parameters or elements, and 4) to need not to assign the connection relationship explicitly owing to adopting the input-output terminal/line names. Moreover, system data handling in designing the PI controller for an actual boiler system expressed in a block diagram is taken up as an example. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1982-03-01 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 45 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002308002 |
| JaLCDOI | 10.18926/15790 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_16_1_21.pdf |
| Author | Koga, Ryuji| Kosaka, Megumi| Sano, Hiroya| |
| Abstract | In a sensitive spectrometry with lead-salt diode lasers, etalon-fringe phenomena often intervene in the measured absorption spectrum. Derivative methods are employed for the purpose of high resolution where the pertaining wavelength is modulated. This paper presents results of mathematical examination on a possible improvement of immunity from the etalon-fringes by choosing the profile of the wavelength modulation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1982-03-01 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 21 |
| End Page | 30 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307691 |
| JaLCDOI | 10.18926/15789 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_1_53.pdf |
| Author | Korenaga Takashi| Moriwake Tosio| Takahashi Teruo| |
| Abstract | Three methods for determining chemical oxygen demand (COD) by means of flow injection analysis (FIA) with potassium permanganate, potassium dichromate, or cerium(IV) sulfate as oxidant, developed in this laboratory, are described from the point of view of their operating properties. The permanganate method is the most sensitive and common, but forms manganese(IV) oxide precipitate which blocks the FIA lines and connectors. Addition of phosphoric acid in the reagent system is, however, effective to some extent in order to avoid blocking the flow system. The dichromate method is the most workable and stable, but produces toxic wastes containing chromium(VI). The cerium method is the most probable because cerium(IV) is the strongest oxidant of the three and less poisonous. The last method with cerium(IV) sulfate is therefore recommendable to apply to the continuous monitoring of COD in many situation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-11-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 53 |
| End Page | 62 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307292 |
| JaLCDOI | 10.18926/15787 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_1_45.pdf |
| Author | Oda Kiichi| Yoshio Tetsuo| O-oka Kazuo| |
| Abstract | Succeeding to 60(Ba,Sr)TiO(3)-10A1(2)O(3)-30SiO(2)glassceramics reported in our previous paper, another type
of ferroelectric glass-ceramics was elaborated by the
controlled growth of Ba(l-x)Ca(x)TiO(3) crystal particles in the glass system 60 (Ba(l-y)Ca(y)) TiO(3)-10Al(2)O(3)-30SiO(2) (0.0 |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-11-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 45 |
| End Page | 51 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307972 |
| JaLCDOI | 10.18926/15786 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_165.pdf |
| Author | Inoue Hiroshi| |
| Abstract | In this paper, the optimal toll-rate and scale of urban expressway is discussed economically. The criterion used is the total surplus of expressway, which is defined as the sum of consumer's surplus of expressway users and producer's surplus on the side of expressway administrator. The total surplus is equivalent to the difference of the value of total saved travel times of expressway users and the total cost required to construct and administrate expressway systems. The flow-dependent travel times is assumed, and traffic demand is induced through equilibrium method. On the other hand, for the management of expressway to be capable, the accounting condition that the fare revenue must repay the total cost should be satisfied. Under this accounting condition, the optimal rate and scale which maximize the total surplus are requested, and their properties are examined. The analysis is practiced for both caces of flowindependent cost function and flow-dependent cost function. One remarkable result is that the maximum feasible scale under the accounting condition does not privide a maximum for total surplus. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 165 |
| End Page | 185 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307222 |
| 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 | 10.18926/15784 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_147.pdf |
| Author | Nago Hiroshi| Kawara Osami| |
| Abstract | In this paper, characteristics of hydraulics and water quality in Kojima Bay are discussed based on field observations. The main results obtained are as follows. (1) The variation of flow rate in Kojima Bay has periods for 30 minutes to 2 hours. This characteristic is represented by a two-dimensional numerical simulation fairly well. (2) The local distributions of salinity and suspended solids show increase in the direction to the mouth of Kojima Bay. On the other hand, the distribution of COD(Mn) is nearly uniform in the whole area of the bay. Salinity appears to be influenced by river discharge sensitively but suspended solids does not. (3) The vertical distributions of salinity and suspended solids are similar. There are similar points between the cross-sectional average of water quality and surface water quality. (4) The surface water quality seems to be influenced by the variation of velocity. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 147 |
| End Page | 164 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002308021 |
| JaLCDOI | 10.18926/15783 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_1_13.pdf |
| Author | Nago Hiroshi| Maeno Shiro| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-11-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 32 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307347 |
| JaLCDOI | 10.18926/15782 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_133.pdf |
| Author | Mori Chuji| Taniguchi Takeo| Kimoto Teruyuki| |
| Abstract | From the theoretical approach to the fill-in minimization problem we present one of the optimal vertex elimination process for a regular finite element mesh M (nxn), and through a number of numerical experiments it is verified that the new process model can always lead to better numerical results comparing to other methods presently in use. Since the process here presented cann't give the actual dissections of M but can clarify how the optimal elimination is, the process includes George's Nested Dissection Method and the method by Duff, Erisman and Reid. By this investigation we can conclude that l) the concept of "Dissection" is neccessary for minimizing the number of fill-ins, 2) the location of the dissection lines can be systematically decided even if n of M is odd or even number, and though the interior area of M is dissected as George's Method, the surrounding area of M is rather irregularily dissected, and 3) the model of the vertex elimination process given in this paper is applied to other kind of regular finite element mesh or finite difference mesh, too. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 133 |
| End Page | 146 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307564 |
| JaLCDOI | 10.18926/15781 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_1_1.pdf |
| Author | Totsuji Hiroo| |
| Abstract | Emission and absorption coefficients of bremsstrahlung by high-temperature partially degenerate electrons are calculated for high-density plasmas where Coulomb coupling between ions is not weak. It is shown that the ion correlation substantially reduces these coefficients. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-11-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 12 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307955 |
| JaLCDOI | 10.18926/15780 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_119.pdf |
| Author | Kaneda Masahiro| Akahori Ichiro| Egusa Masanori| Kuraoka Hiroaki| |
| Abstract | A high speed and high accuracy simulator whose data-handling is light and whose weak stability is assured even for stiff systems is discussed. This work is a part of CAD package : CADPACS-T which has been under development for the purpose of designing control systems utilizing TSS of a large scale digital computer in our laboratory. This simulator realizes high accuracy, high computational speed and high reliability adopting A-stable extrapolation methods to transform into a difference system, a recursive formula of an output interval to solve the difference equation, automatic choice of an optimal step length such that minimizes an predicted error, and evaluating error bounds closely near the actual errors in the point of numerical calculation. Moreover, in the point of data management, this realizes separation of program modules from data, common utilization of data and separation of investigation from simulation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 119 |
| End Page | 132 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307465 |
| JaLCDOI | 10.18926/15779 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_107.pdf |
| Author | Totsuji Hiroo| Obata Takashi| Funahashi Takahiko| |
| Abstract | The dynamic form factor and the transverse part of the fluctuation spectrum of momentum density are analysed on the basis of the generalized Langevin equation. According to the indication of the result, numerical experiments are extended and it is shown that the transverse fluctuation spectrum contains two kinds of excitations. The frequency moment sum rules are discussed in relation to one of these excitations. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 107 |
| End Page | 118 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307901 |
| JaLCDOI | 10.18926/15778 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_18_1_111.pdf |
| Author | Taniguchi Takeo| Matsumoto Takumi| Mitsuoka Kazuhiko| |
| Abstract | The convergence condition of the explicit difference method for the heat transfer problem is aiready obtained. On the other hand, if the problem is formulated by using the weighted residual method for spatial axis, we have no tool to estimate the critical timestep width. In this paper, the estimation method is theoretically presented, and its propriety is examined through a number of numerical experiments. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-03-30 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 111 |
| End Page | 130 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307658 |
| JaLCDOI | 10.18926/15777 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_93.pdf |
| Author | Totsuji Hiroo| |
| Abstract | A method to obtain exact lower bounds for the correlation energy of one-component plasmas is extended to neutral mixtures of charged hard spheres. Upper bounds for the correlation functions of charge densities are derived. These upper bounds, the semi-positivity of correlation functions, and that of the charge-densityfluctuation spectrum are used to improve upon the known bound due to Onsager. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 93 |
| End Page | 106 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307165 |
| JaLCDOI | 10.18926/15776 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_79.pdf |
| Author | Koga, Ryuji| Nagase, Satoru| Kosaka, Megumi| Sano, Hiroya| |
| Abstract | A method to monitor atmospheric gas concentration employing a tunable diode laser is proposed. An apparatus was built and experiments were made. The tunable diode laser employed was of'PbSnTe with its wavenumber about 1200 cm(-1) at a temperature of 77 K. Methane concentration in laboratory atmosphere was measured on the experiments. The inquired gas-density is obtained by a hardwired microcomputer incorporating the measured absorption spectrum over a prescribed range instead of an absorption at a single wavenumber. By this, drift type noises are suppressed. After an analysis based on experimental data, an attainable sensitivity for methane was found to be 1 ppb.m. This value may increase if an etalon fringe interference exists. The natural concentration, about 1 ppm, of atmospheric methane was actually measured with a short optical path of only one meter. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 79 |
| End Page | 92 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307246 |
| JaLCDOI | 10.18926/15775 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_18_1_101.pdf |
| Author | Mori Chuji| Hattori Susumu| |
| Abstract | In stereo matching of images, sample cross-covariances are used commonly as a criterion for deciding whether matched points are truly conjugate. Hereupon window width is a serious parameters to dominate matching stability. This paper argues about relation of matching stability with window width in terms of statistical behavior of sample covariances. For simple circumstances of analysis auto-covariances of a single image are considered instead of cross-covariances of stereo ones. First the mean and variance of sample auto-covariances are derived with parameters, window width and positional lag. Secondly they are evaluated from the correlation function estimated on an aerial image under the assumption of ergodicity to observe how they vary according as two parameters vary. From this result a variation factor is proved usefull to estimate appropriate window width. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-03-30 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 101 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307207 |
| JaLCDOI | 10.18926/15774 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_18_1_91.pdf |
| Author | Sano, Hiroya| Koga, Ryuji| Kosaka, Megumi| Wake, Ichiro| |
| Abstract | 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. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-03-30 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 91 |
| End Page | 100 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307204 |
