JaLCDOI 10.18926/15625
FullText URL Mem_Sch_Eng_OU_3_77.pdf
Author Monobe Kazuo| Yamashita Yuhiko| Fujiwara Yasuo| Fujiwara Yoshitaka|
Abstract We tried to clarify the crystallization mechanism of long chain polymers in solution under shearing stress using polyethylene. From the bright and dark field electron microscope observations and the electron diffraction study, we demonstrated that the resulting fibrous crystals consist of the central threads with an extended chain character and the lamellae with a folded chain character nucleated on the threads. The measurements of thermal and mechanical properties gave the additional confirmation for this suggestion. From these results we discussed the crystallization mechanism on the fibrous crystals.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 77
End Page 83
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307234
JaLCDOI 10.18926/15624
FullText URL Mem_Sch_Eng_OU_3_157.pdf
Author Misaki Takayoshi| Okamoto Takuji| Kato Osamu|
Abstract In the analog circuits for the systms governed by the dilfercntial equations with the coefficients which are a function of one or mOre of the dependent variables, the magnitudes of their circuit elements must be variable in accordance with the nature of the function. Such circuit elements can be realized by means of inserting or removing the additional elements with high speed switches in the analog circuits. Particularly, in the case of varying stepwise this method is effective. But as an analog circuit is regarded as a short-time or repetitive type analyzer, the above switches must be instantaneous operation. In this paper, first, it is made sure by the experiments that some of the transistor switches arc met this condition, and moreover arc very low closed resistance, very high open resistance and neglegible small voltage offsets. Next, the basic technique for the direct analog simulation usiug transistor switches is described about the simple example, i.e. the oscillatory system with varying cross-scctional surge tank. Finally, as its applications, the transient problems of these oscillatory systems arc solved by means of these analog circuits.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 157
End Page 162
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307953
JaLCDOI 10.18926/15623
FullText URL Mem_Sch_Eng_OU_3_151.pdf
Author Himei Toyoji| Inoue Jyunichi| Kondo Tadao| Nakanishi Senichiro|
Abstract The waveform of the load current has been analyzed theoretically on the single-phase series R-C circuit controlled by the back to back SCR pair. And then, the fluctuation of the barmonics calculated by the use of the electronic digital computer, has been discussed as for the firing angles of SCRs and the phase angle of load.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 151
End Page 155
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307534
JaLCDOI 10.18926/15622
FullText URL Mem_Sch_Eng_OU_3_143.pdf
Author Himei Toyoji| Inoue Jyunichi| Fukumori Kooichi|
Abstract A modified type of the resonant turn-off d-c chopprr using an auxiliary SCR, compared with its conventional one, has no limitation about its starting and also operates more steadily. Presented in this paper, making a comparison between the modified type and the conventional one, are the circuit analysis and its efficiency measurement from the point of view of overall efficiency, that is, the ratio of the output to the input. Furthermore, some effects of the source impedance, counter emf load, etc. are discussed. As a result, it has been analytically clarified that this modified type is different from the conventional circuit only by one terminal connection of turn-off capacitor, but has the features of uncompounded circuit configuration, no limitation about its starting and more steady operation.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 143
End Page 150
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307152
JaLCDOI 10.18926/15621
FullText URL Mem_Sch_Eng_OU_3_137.pdf
Author Himei Toyoji| Fujitsuka Takeshi| Inoue Jyunichi| Komatsubara Hitoshi| Kadowaki Masahiko|
Abstract The measurement of the dissipated energy in switching-off has been attempted to make clear the function of spark on electric contacts, which may unfortunately cause the combustible gas, such as propane gas etc, to catch fire and result in fire accidents. By utilizing the "Memoriscope" has been the meaurement carried out and the feature of this method is to provide the information on not only the amount of dissipated energy involved in one action but also on the trace of its instantaneous power which can affect catching fire delicately. Presented in this paper are the discussion of this measuring method and the measured results which are obtained experimentally in order to investigate the dependence of the energy dissipation on variety of contacts, contacts' deterioration and circuit arrangements.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 137
End Page 142
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307412
JaLCDOI 10.18926/15620
FullText URL Mem_Sch_Eng_OU_3_131.pdf
Author Himei Toyoji| Fujitsuka Takeshi| Inoue Jyunichi| Wakabayashi Jiro|
Abstract The a-c voltage control circuit, composed of parallel connection of a SCR and a reactor, gives the similar performance as the control circuit of a back to back SCR pair. However, the control characteristics of this circuit is affected by magnetizing characteristics of reactor. In this paper, the circuit with the resistive load has been analyzed by using the approximated models of hysteresis loop of core materials, where the SCR's forward voltage drop is taken into account. The results of the analysis have revealed the facts as follows, I) The control characteristics of the a-c voltage in average value is independent on the magnetizing characteristics of reactors except in the vicinity of minimum output point. But, in effective value, it is not valid. 2) A SCR's forward voltage drop results in the reduction of not only SCR's current but also reactor's current. 3) The a-c output current does not include the d-c component, if the winding resistance of the reactor is negligible.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 131
End Page 136
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307481
JaLCDOI 10.18926/15619
FullText URL Mem_Sch_Eng_OU_3_127.pdf
Author Nakata Takayoshi| Ishihara Yoshiyuki|
Abstract In order to measure the iron loss of the silicon steel plates, we produced a vectormeter using a thyristor and a gate turn off thyristor by way of experiment. This equipment is very useful, because the frequency range is improved very much in comparison with the vectormeter which is composed of the mechanical rectifying system using a synchronous motor, namely, is enlarged from 60Hz to 1kHz,
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 127
End Page 130
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307274
JaLCDOI 10.18926/15618
FullText URL Mem_Sch_Eng_OU_3_123.pdf
Author Moriwake Tosio| Honjo Yozo|
Abstract Condensation of chroman-4-one with ethyl formate in the presence of sodium methoxide gave 3-hydroxymethylenechroman-4-one (II). Reaction of II with hydroxylamine hydrochloride, followed isomerization by potassium t-butoxide gave IV. 3-Cyano-3-methylchroman-4-one was obtained by methylation of IV or treatment of III with potassium t-butoxide and methyl iodide.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 123
End Page 126
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307167
JaLCDOI 10.18926/15617
FullText URL Mem_Sch_Eng_OU_3_119.pdf
Author Takeda Akira| Wada Satosi| Uno Takaaki| Masuike Taketosi| Torii Sigeru|
Abstract The preparation of the title compounds as a new type of stable S-ylides has been described. The reaction of 1-dimethylsulfuranylidene-1-phenylsulfonyl-2-propanone (IIb) with lithium aluminium hydride was found to result in the formation of trans-phenylpropenylsulfone (IV), phenylsulfonyl-2-propanone (Ib), and an unidentified paraffin as major products.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 119
End Page 122
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307991
JaLCDOI 10.18926/15616
FullText URL Mem_Sch_Eng_OU_3_113.pdf
Author Takeda Akira| Wada Satosi|
Abstract A series of α-monoalkylamino-α-arylacetamides and α-dialkylamino-α-arylacetamides have teen synthesized via the corresponding nitriles. Some of these compounds have been found to exhibit moderate activity as herbicides.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 113
End Page 117
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307743
JaLCDOI 10.18926/15615
FullText URL Mem_Sch_Eng_OU_3_107.pdf
Author Takeda Akira| Torii Sigeru| Oka Hirotosi|
Abstract The electrochemical oxidation of trans-cinnamic acid in a mixed aqueous solution of acetic acid and methanol containing potassium hydroxide was studied. The separation of ketones and aldehydes from the neutral materials using Girard reagent P gave benzaldehyde, tolualdehydes, acetophenone, methylacetophenones, propiophenone, phenacyl acetate, and phenacyl alcohol. The mechanism of the anodic reaction of trans-cinnamic acid has been discussed.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 107
End Page 112
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307863
JaLCDOI 10.18926/15614
FullText URL Mem_Sch_Eng_OU_3_101.pdf
Author Hirai Taketsugu| Takahashi Katsuaki|
Abstract Potential sweep voltammetries of Na(2)O·SiO(2) and Na(2)O·2SiO(2) at 730-1200°C were performed with the stationary platinum wire electrode and with the sweep rates of 40 and 120mV/sec. Although current-potential relation of Na(2)O . SiO(2) at 1200°C gave stationary S-shape pattern, those of the rest were transient modes with hysteresis. From the voltammetric considerations, a reversible oxygen electrode process where diffuion of free oxygen anion or silicate anion may be a rate-determining stage was tentatively proposed. Approximate estimations of decomposition voltage supported that a sole reaction process such as the decomposition of Na(2)O or indirect decomposition of SiO(2) in the melt was most probable.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 101
End Page 105
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307459
JaLCDOI 10.18926/15613
FullText URL Mem_Sch_Eng_OU_3_95.pdf
Author Suefusa Kiyoshi| Monobe Kazuo|
Abstract Polyethylene was crytallized from the molten film under temperature gradient. As a result, the optically positive spherulites were observed, though only the negative spherulites had been observed previOusly in polyethylene. When the radial structure units twisted regulary in a spherulite are formed parallel to the surface of the film, the spberulite is usually optically negative in polyethylene. In this study, the temperature gradient normal to the surface of the film gives so significant tilt of the radial structure units formed to the surface of the film that the radial refractive index becomes larger than the tangential one under the transmitted polarized light and the spherulites have optically positive behavior. The optical behaviors of the polyethylene spherulites and the crystallizing condition were studied and discussed.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 95
End Page 100
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307360
JaLCDOI 10.18926/15612
FullText URL Mem_Sch_Eng_OU_3_89.pdf
Author Monobe Kazuo| Yamashita Yuhiko| Fujiwara Yasuo| Fujiwara Masahiko|
Abstract It was shown that the fibrous crystals of isotactic polybutene-l crystallized from solution under shearing stress are also composed of the central threads with an extended chain character and the epitaxally deposited lamellae with a folded chain character. The characteristic behaviors in this polymer exist in; (1) that the resulting crystals possess the hexagonal modification of form 1'; (2) that at low polymer concentrations the lamellar crystals with an orthorhombic modification of form Ⅲ are precipitated in similar fashion to the case in the absence of stirring; (3) that the morphology in surface replica of thick deposited film is very similar to that of melt extruded polyethylene film crystallized in a highly stressed state.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 89
End Page 94
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307171
JaLCDOI 10.18926/15611
FullText URL Mem_Sch_Eng_OU_3_85.pdf
Author Monobe Kazuo| Fujiwara Yasuo| Yamashita Yuhiko| Hironaka Kiyoshi|
Abstract Isotactic polypropylene was crystallized in the form of fibrous crystals from solution under shearing stress. The fibrous crystals consist of the oriented cluster of micro fibrils. From the electron microscopy and the electron diffraction study, it was found that the fine texture of this fibrous crystals is also the two component systems which are composed of the central threads with an extended chain character and the lamellae with a folded chain character deposited on the threads, as in polyethylene. Relatively larger lamellar structure than that of polyethylene was observed. The effect of crystallization conditions to the formation of the fibrous crystals from solution of isotactic polypropylene was described briefly. A characteristic melting behavior due to the melting of the central threads with an extended chain character was observed from the thermogram of differential scanning calorimeter.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 85
End Page 88
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307605
JaLCDOI 10.18926/15610
FullText URL Mem_Sch_Eng_OU_3_73.pdf
Author Torii Sigeru| Isikawa Tatsuo| Takeda Akira|
Abstract Amide derivatives of γ-substituted paraconic and aconic acids have been synthesized. Ultraviolet spectra of the aconic acid derivatives showed characteristic fine structure in the region of 245 to 280 mμ.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 73
End Page 76
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307690
JaLCDOI 10.18926/15609
FullText URL Mem_Sch_Eng_OU_3_69.pdf
Author Torii Sigeru| Funakosi Hitosi| Takeda Akira|
Abstract Monoamides of 5-substituted 4-methyl-3-carboxy-3(or 4)-alkenoic acids have been synthesized, starting with substituted itaconic anhydrides. The anhydride ring was opened by amines to afford N-aryl(or alkyl)-4-alkyl(or aryl)-3carboxy- 3(or 4}-alkenamides. The structure of the amide was elucidated by the comparison with the reference compound prepared from the corresponding Stobbe half-esters.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 69
End Page 72
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307752
JaLCDOI 10.18926/15607
FullText URL Mem_Sch_Eng_OU_3_63.pdf
Author Takahashi Katsuaki| Kambara Ginjiro| Okahara Masamichi|
Abstract Spectrophotometric investigations were carried out on soda-lime-silica glasses containing iron in high content, corresponding to 4.9 wt.% Fe(2)O(3), and melted under the various reducing conditions, as a part of series of studies on the redox behavior of glass. Absorption measurement was made in the range from 340 mμ to 1000 mμ. Ferric ions could not be reduced to ferrous ions completely even by the amount of carbon of four equivalents. The ratio of the strength of light absorption at 1000 mμ as a typical band of Fe(2+) ions and that at 380mμ of Fe(3+) ions was expressed as E(1000)/E(380), which was examined for glass compositions as well as various carbon amount added to glass batches. The ratio decreases as the carbon amount increases and increases with decreasing content of Na(2)O or CaO. These changes of spectrophotometric properties of glasses were discussed from the view point of state of the the iron ions. Besides, some results on oxidized glasses were also added.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 63
End Page 68
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307848
JaLCDOI 10.18926/15606
FullText URL Mem_Sch_Eng_OU_3_57.pdf
Author Takahashi Teruo| Shimizu Kengo|
Abstract In this report the formation of bubbles at a single circular hole is considered theoretically, as a fundamental study on contacting devices for the purpose of mass transfer operation in chemical engineering. From many previous experimental data, it is found that the mechanism of bubble formation is classified into steady bubble growth system and potential bubble formation system.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 57
End Page 62
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307610
JaLCDOI 10.18926/15605
FullText URL Mem_Sch_Eng_OU_3_51.pdf
Author Takahashi Teruo| Akagi Yasuharu|
Abstract The liquid phase mass transfer resistance in the Rotational-current tray is one of the most important factors in its design and performance. In this report, the holding time of liquid on the tray was studied experimentally by water-air system, and then the desorption tests were carried out by water-oxygen-air system that the liquid phase resistance were controlling. From the results of these experiments, it was found that the gas flow rate and the holding time of liquid on the tray control the tray efficiency strongly. Thus, the experimental equation for the number of transfer units based on liquid phase was derived. And also, it was found that this type of tray can be operated at high efficiency with a higher gas rate than the Kittel tray and the sieve tray without downcomer.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 51
End Page 56
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307343