JaLCDOI 10.18926/15643
FullText URL Mem_Sch_Eng_OU_6_67.pdf
Author Nakata Takayoshi| Ishihara Yoshiyuki|
Abstract In this paper, we report the procedure to analyse magnetic circuits and give the linear solutions on magnetic characteristics of the three-phase core-type transformer which is composed of the complicated magnetic paths. First, we explain the construction of cores investigated and normalize the sizes of a core. To analyse these magnetic circuits, we introduced the electrical eqcuivalent circuits and obtained the general fundamental equations for each core. Then, we drew the linear-numerical solutions using an electronic computer, and cleared the relationships between the sizes of a core and the amplitudes and phase angles of fluxes in magnetic paths. Related with the above facts, we investigate the influence of these sizes on the core loss using cores of various quality.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 67
End Page 82
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307626
JaLCDOI 10.18926/15642
FullText URL Mem_Sch_Eng_OU_6_61.pdf
Author Fujitsuka Takesi| Himei Toyoji| Wakabayashi Jiro|
Abstract In this paper, the parallel inverter circuit with the load consisted of resistive load and constant reactive load in parallel, is analyzed taking into acourlt the d-c source reactance. The circuit has a good voltage regulation for the variation of resistive load current, except the vicinity of no load. The design method in using the results of analysis is also discussed.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 61
End Page 65
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307153
JaLCDOI 10.18926/15641
FullText URL Mem_Sch_Eng_OU_6_57.pdf
Author Monobe Kazuo| Murakami Yushi| Yokoyama Fumiyoshi|
Abstract Crystalline adducts of urea with n-alkanes (C(8)~C(20)) and n-l-alkanols (C(12)~C(18)) were prepared. From thermal analysis and X-ray diffraction study on the adducts, we found that the composition of adducts and the heat of decomposition can be obtained easily from the thermogram of adducts.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 57
End Page 60
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307947
JaLCDOI 10.18926/15640
FullText URL Mem_Sch_Eng_OU_6_53.pdf
Author Yamashita Yuhiko| Monobe Kazuo|
Abstract Lamellar crystals of amylose V complexes with the 6(1), 7(1) and 8(1) helical configurations can be prepared from aqueous solutions of amylose by using various complexing agents. It is noted that the crystal shape can be explained by the symmetry of the unit cell in the basal plane and the chain packing in the unit cell is cOncerned with the symmetry of helical chains. The existence of 6(1), 7(1) and 8(1) heliccs which occurs stepwisc with the number of glucopyranose an intger is discussed.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 53
End Page 56
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307483
JaLCDOI 10.18926/15639
FullText URL Mem_Sch_Eng_OU_6_47.pdf
Author Takahashi Katsuaki| Goto Yasumasa|
Abstract The glass forming limit by substitution of CdS for CdO in a CdO-B(2)0(3) glass was determined by chemical analysis. When x CdS-(60-x)CdO-40B(2)0(3) nominal mixtures in weight ratio were heated at 1100°C in flowing nitrogen gas for 1/2 hour, about 40~50% of mixed CdS and 10-15% of the mixed CdS were evaporated. The limit of nominal composition for glass forming was 10CdS-50CdO-40B(2)0(3) and the corresponding virtual composition after the above heat treatment was found to be 4.9CdS-46.4CdO-48.7B(2)O(3). Further addition of CdS made the melt devitrefied with CdS precipitation. D.C. conductivity measurements revealed that the current density was not linear with respect to the applied voltage, but the resistivity ranged around 10(12)Ω・cm for 4.1CdS-48.8CdO-47.1B(2)O(3) (virtual composition) glass and around 10(11.5)Ω·cm for 4.9CdS-46.4CdO-48.7B(2)O(3) glass. These sulphur containing glasses did not show photoconduction, although CdS-precipitated materials showed slight photoconductivity when disposed in ultra violet radiation. Apparent dielectric constant and tan 8 were also measured as a function of frequency, revealing a moderate dispersion in the CdS-precipitated glasses.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 47
End Page 52
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307147
JaLCDOI 10.18926/15636
FullText URL Mem_Sch_Eng_OU_6_27.pdf
Author Ohta Mutsuo| Hashimoto Fumio| Maeda Hironobu|
Abstract Fiber textures of drawn wires of Al-Zn alloys containing precipitates were studied mainly by X-ray methods. In supersaturated solid solution the wire texture was a double fiber texture with [100]and [111]. It was considered that a phase precipitates were rotated with matrix, while they were deformed. And then the matrix containing stable precipitates (Zn) had [100] and [111] textures. The intense spots, corresponding to [111] fiber texture of matrix, in the Debye rings of (002)p and (101)p planes of precipitates were clearly observed. But, on the other hand, spots, corresponding to [100] fiber texture of matrix, shown the prefered orientation of precipitates in (002)p Debye ring were very weak and brodening.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 27
End Page 31
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307980
JaLCDOI 10.18926/15634
FullText URL Mem_Sch_Eng_OU_6_21.pdf
Author Wada Tsutomu| Shimizu Akira|
Abstract In this report, the effects of splitter position on the attached jet were experimentally investigated for the purpose of discussing the applicability of a usual mathematical model without splitter. As results, the followings were confirmed, (l) For the splitter distance shorter than the critical distance, the pressure in the bubble lowers and the jet radius of curvature shortens. (2) At the ratio L(s)/D=4~5, the switching control flow rate becomes maximum. And bordering this value, the effects of splitter position on the switching are quite conversely. For the splitter distance longer than the above value, the switching control flow rate decreases, as increasing the distance. (3) For the splitter distance of 1.5~2 times critical distance, the switching is almost never affected by the splitter.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 21
End Page 25
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307823
JaLCDOI 10.18926/15632
FullText URL Mem_Sch_Eng_OU_6_13.pdf
Author Osaki Hirokazu| Kikuchi Susumu|
Abstract The equipment measuring the critical flicker fusion frequency (CFF) is made in order to measure many subjects' CFF at the same time. This equipment is defined the multi-flicker. The equipment measuring CFF, used until now is defined the mono-flicker. It is analysed what factors influence CFF strongly. Then it is made clear that CFF value measured by the multi-f1icker can be used to show the brain weariness as well as that of the mono-flicker, and the vigual angle and the intensity of illumination in the room influence CFF value strongly.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 13
End Page 19
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307387
JaLCDOI 10.18926/15630
FullText URL Mem_Sch_Eng_OU_6_7.pdf
Author Hirose Koji| Oka Takuma|
Abstract A series of turbulent pipe flow experiments with dilute aqueous C.M.C. solutions are described. The purpose of these experiments are to compare the anomalous viscous drag results from these experiments with the results using water (Newtonian viscous fluid). The additive concentrations of the present experiments are from 0.01% to 0.5% by weight of C.M.C., giving power-law indexes 1 to 0.75, respectively. All of the concentrations are found to give a reduction in turbulent friction factor, compared with Newtonian at the same Reynolds number. A maximum friction factor reduction of 64 % is obtained at a Reynolds number 2x10(3) for solutions having polymer concentration of 0.3% by weight.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 7
End Page 12
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307497
JaLCDOI 10.18926/15626
FullText URL Mem_Sch_Eng_OU_6_1.pdf
Author Honda Kazuo| Konaga Tetsuro|
Abstract It is very important to clarify the question whether fatigue crack propagation will be affected by mechanical propaties or other propaties of materials. In the present paper the authors studied in relation of yield strength and stacking fault energy to rate of fatigue crack propagation. αbrass were chosen for the investigation because they provided sufficient range in both quantities of interest that either could be varied independently of the other. Fatigue tests were carried out under full bending moment of flat specimens with V-shape notch. Chosen stress levels were 0.6 σy and 0.8 σy in which σy is yield strength, rate of fatigue crack propagation was evaluated from the second stage of the curve of fatigue crack propagation. The dependence of the rate on stacking fault energy γ was found to be dl/ dN=G・γ(n). But dl/dN did not systematically to change in yield strength. Thus, γ is concluded to be the controlling variable.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 1
End Page 6
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307864