JaLCDOI 10.18926/15824
FullText URL Mem_Sch_Eng_OU_17_1_97.pdf
Author Oda Kiichi| Yoshio Tetsuo| O-oka Kazuo|
Abstract A series of ferroelectric glass-ceramics was elaborated by the controlled growth of Ba(1-x)Sr(x)TiO(3) crystal particles in the glass system 60[Ba(1-y)Sr(y)]TiO(3)-10Al(2)O(3)-30SiO(2)(0≦y≦0.2) in molar basis. Analysis of crystal phases by X-ray diffraction revealed that Sr content in Ba(1-x)Sr(x)TiO(3) increased with increasing content of SrO in glasses by its preferential transfer into the crystal phase, and the appropriate temperature for the crystal growth was 1100°C. Curie temperatures of glass -ceramics shifted to lower temperature with increasing SrO content in the crystal and comparatively high dielectric constant was obtained at room temperature for a glass-ceramics with y=0.2. Frequency dependences of dielectric constant and loss tangent were examined in the frequency range from 1 K to 1 M Hz.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 97
End Page 105
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307890
JaLCDOI 10.18926/15821
FullText URL Mem_Sch_Eng_OU_17_1_81.pdf
Author Taniguchi Takeo| Kanei Toshio|
Abstract In this investigation the estimation method of the number of iterations for definite convergence condition by use of the Gauss-Seidel method applied for a set of linear equations which is obtained from the finite element analysis (or the finite difference analysis) of any rectangular area subdivided into N*M is proposed. Though the number of iterations can be obtained by using the eigenvalue of the governing equations, the proposed method does not require the eigenvalue but only the values of Nand M. Numerical experiments on this estimation method clarify that the estimated values are within the error bound of 10%.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 81
End Page 96
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307520
JaLCDOI 10.18926/15820
FullText URL Mem_Sch_Eng_OU_17_1_73.pdf
Author Myojin Sho| Ohnishi Masahiko|
Abstract Some extension is made of the previous papers of the same title in order to investigate (1) what aspect consumers' surplus has according to the characteristics of inverse demand curve and (2) where the maximum consumers' surplus is reached in an equilibrium of toll revenues and cost. As for (1) three kinds of inverse demand curves are assumed in general form. The marginal consumers' surplus to expansion of expressway network is proved to be of definite sign (positive or negative) or equal to zero according to each curve assumed. For each of curves, the region where consumers' surplus finds its maximum is also shown on the expressway users ~ network expansion plane.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 73
End Page 79
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307936
JaLCDOI 10.18926/15819
FullText URL Mem_Sch_Eng_OU_17_1_61.pdf
Author Maeno Shiro| Nago Hiroshi|
Abstract In this paper the liquefaction of sand bed under oscillating water pressure are treated as a basic study of the prevention works against the scouring around the hydraulic structures. The results of the former resurch show that the occurrence of the liquefaction depends on both properties of the oscillating water pressure and of the sand layer. Considering the latter properties, that is, the resistivity against the liquefaction increases with the increase of the permeability of the sand bed, we propose the displcement method as one of the prevention works, which is a method to displace the upper layer of the sand bed by the sand with large permeability. The effects of this method are investigated theoretically and experimentally. By the experimental study, it is shown that the proposed displacement method has the apparent effect to prevent the liquefaction. The experimental results are explained fairly well by the theoretical analysis based on the theory of the flow through the elastic porous media.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 61
End Page 71
ISSN 0475-0071
language 英語
File Version publisher
JaLCDOI 10.18926/15817
FullText URL Mem_Sch_Eng_OU_17_1_41.pdf
Author Mori Chuji| Hattori Susumu| Hamate Shinya|
Abstract The algorithm of automatic stereo plotting by iterative image correlation from aerial photographs and the corresponding empirical tests are described. The algorithm is oriented to off-line process, using a image scanner and a general purpose computer, and consists of 3 hierarchical correlation steps, based on one-dimensional matching using usual correlation maximum. For the correlation calculation, the FFT is effectively used. Though some defects exist in the algorithm at present, close contour plotting to middle scale maps is available except in hilly regions, in which marked features in ground covers do not exist.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 41
End Page 60
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307285
JaLCDOI 10.18926/15816
FullText URL Mem_Sch_Eng_OU_17_1_15.pdf
Author Himei Toyoji| Nakanishi Sen-ichiro| Funabiki Shigeyuki| Komatsubara Hitoshi| Kurose Osamu|
Abstract An ac phase control circuit by thyristor is widely used in industry, The characteristics of the singlephase circuit with series RLC elements are numerically analyzed, and is reported the interesting phenomenon of step-up voltage without transformer. However, the performance of three phase phase control circuit with series RLC elements is not made clear. In this paper, the performance of three-phase control circuit of a balanced and an unbalanced load with series RLC elements is described. The analytical programs with each load are developed, and it is clarified that the calculated by this analytical program agree well with the measured. The calculated results, e.g. waveforms, RMS values of voltage and current, power, and power factor are illustrated and discussed the step-up phenomenon in three phase.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 15
End Page 40
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307185
JaLCDOI 10.18926/15814
FullText URL Mem_Sch_Eng_OU_17_1_1.pdf
Author Takahashi Teruo| Miyahara Toshiro|
Abstract This paper deals with the comparison of gas-liquid holdup and froth height on a perforated plate under various operational conditions such as liquid stagnant, cocurrent, countercurrent and crosscurrent gas-liquid flow system. Tendency to foam is remarkable in countercurrent and crosscurrent flow system. The crosscurrent flow system is suitable for the operation of mass transfer from the point of view of gas-liquid holdup.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 1
End Page 13
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307710