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 英語
File Version publisher
NAID 120002307658
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 英語
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 英語
File Version publisher
NAID 120002307204
JaLCDOI 10.18926/15771
FullText URL Mem_Sch_Eng_OU_18_1_75.pdf
Author Ohzuku Tsutomu| Hirai Taketsugu|
Abstract A basic kinetic equation of potential-step chronoamperometric current-time curve controlled by the rates of diffusion and electron transfer for a simple one-electron charge transfer reaction was given and various features of current-time curves were deduced from a theoretical treatment. The current-time equations for reversible and irreversible electron transfer processes appear as special cases with limited conditions of the equation reported in the present paper. And a potential-step chronoamperometric method to determine kinetic parameters from a current-time curve was proposed therefrom. The extension of a basic kinetic equation to more general multistep charge-transfer process was also considered.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1984-03-30
Volume volume18
Issue issue1
Start Page 75
End Page 89
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307131
JaLCDOI 10.18926/15768
FullText URL Mem_Sch_Eng_OU_18_1_57.pdf
Author Ohzuku Tsutomu| Sawai Keijiro| Hirai Taketsugu|
Abstract 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.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1984-03-30
Volume volume18
Issue issue1
Start Page 57
End Page 73
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307985
JaLCDOI 10.18926/15767
FullText URL Mem_Sch_Eng_OU_18_1_43.pdf
Author Ohzuku Tsutomu| Hirai Taketsugu|
Abstract An equation on the current-polarization voltage characteristics of single charge transfer redox reaction on a rotating disk electrode (RDE) was given and a curvefitting method to determine kinetic parameters from an observed polarization curve was proposed therefrom. The method was demonstrated for Fe(2+)/Fe(3+)redox reaction in acidic aqueous electrolyte on Pt-RDE and the limitation of the method was discussed. The extension of the method to multistep charge transfer reaction was also considered.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1984-03-30
Volume volume18
Issue issue1
Start Page 43
End Page 56
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307914
JaLCDOI 10.18926/15764
FullText URL Mem_Sch_Eng_OU_18_1_33.pdf
Author Osaki Hirokazu| Miyake Hirofumi| Kikuchi Susumu| Ogata Masana|
Abstract In this paper, we mentioned the apparatus developed to measure CFFs at the various point of the retina. Eleven CFFs measured at the central retina of both eyes (used usually} simultaneously, at the central retina of each eye separately, and at four points of the peripheral retina of each eye were analyzed together and referred to as the multi-point critical flicker fusion frequency (MCFF) . MCFF can be used to estimate the level of cortex activity, since the temporal and nasal parts of each eye are connected to different visual cortexes through the optic nerve. As the apparatus used to measure the MCFF was controlled by a micro-computer, the order of measurements and the calculation were done automatically.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1984-03-30
Volume volume18
Issue issue1
Start Page 33
End Page 42
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307595
JaLCDOI 10.18926/15762
FullText URL Mem_Sch_Eng_OU_18_1_1.pdf
Author Nakata Takayoshi| Takahashi Norio|
Abstract 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.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1984-03-30
Volume volume18
Issue issue1
Start Page 1
End Page 31
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307976