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Volume 10, Issue 6
Displaying 1-14 of 14 articles from this issue
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Yosiharu Torizuka, Yuzo Kojima, Tosihiko Okamura, Kozo Kamiryo1955 Volume 10 Issue 6 Pages 417-420
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe microwave Zeeman effect of N14H3 inversion spctra was investigated at strong magnetic field to observe molecular g-factor in the decoupled state of spin-rotation interaction. The result on J, K=1, 1 line shows the transition from Zeeman effect to Paschen-Back effect near 10,000 oersteds. The obtained molecular g-factors for several different JK value give some information on g-factor of N14H3 both parallel and perpendicular to the molecular axis.View full abstractDownload PDF (752K) -
Yasushige Fukano1955 Volume 10 Issue 6 Pages 420-424
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe lattice constant of evaporated KCl-crystals was measured with an accuracy of 0.01% using gold foil as a standard. The lattice constant of gold foil was calibrated in terms of TlCl and was found in agreement with the X-ray value. Spacings of KCl measured just after evaporation are larger than the X-ray value by about 0.15%, provided the size of KCl-crystals are larger than 150Å. Spacings decrease when evaporated specimens are exposed to the air or are heated in vacuum. The lowest value of lattice constant obtained in this experiment is in agreement with the X-ray value within the experimental error.View full abstractDownload PDF (588K) -
Masakazu Marutake, Takuro Ikeda1955 Volume 10 Issue 6 Pages 424-428
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElastic properties of PbZrO3 and its solid solutions with PbTiO3, BaZrO3 and SrZrO3 were studied by measuring resonant frequencies of bars by the composite-bar method. In the antiferroelectric range, they show elastic behaviors similar to barium titanate; and to explain these anomalies, interactions between strains and anti-parallel oriented dipoles —micro-piezoelectric effects—were introduced in a phenomenological theory. It was also pointed out that the elastic compliance coefficient for constant polarization (sP) of BaTiO3 changes discontinuously at the Curie point and that the Devonshire’s theory is insufficient.
In addition, it was revealed from elastic and dielectric measurements that (Pb0.85–Sr0.15)ZrO3 has another new phase, the nature of which, however, could not be determined.View full abstractDownload PDF (576K) -
Shiro Ogawa, Denjiro Watanabe, F. Eiichi Fujita1955 Volume 10 Issue 6 Pages 429-436
Published: June 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt has been confirmed by many electron diffraction works that the singlecrystal-like films of silver, gold, copper, and nickel which are formed on heated cleavage surfaces of rocksalt by evaporation in vacuo have the repeated twinning structures. However, the thickness, the area, and the repeat frequency of the twinned layer have not yet been studied. The present work was undertaken to study these points by means of electron microscope. Parallel, linear stripes are observed in electron micrographs of the films. These stripes are attributed to the twinned lattice, the thickness of which is of the order of one hundred Å. Parallel, linear stripes are not observed for aluminium. This agrees with the fact that no twinning occurs in this metal.View full abstractDownload PDF (3164K) -
Junkichi Nakai, Yoshio Inuishi, Yang Tsung-che1955 Volume 10 Issue 6 Pages 437-443
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relations between the electron emission, the electrical conduction and the noise of the oxide coated cathode have been studied. The Richardson plot of the conduction current showed two straight line regions. The temperature dependence of the conduction current was found to be the same as that of the emission current, and the density of the former was a few times larger than that of the latter. The noise current accompanying with the conduction current showed sharp increase when the conduction current saturated. This is owing to the disappearance of the space charge in the pore. From these experimental results the pore conduction mechanism of the oxide-coated cathode was ascertained.View full abstractDownload PDF (812K) -
Tatsuya Niimi1955 Volume 10 Issue 6 Pages 444-453
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the capacity of the space charge layer at a metal semiconductor contact is investigated. The variation in the capacity with temperature has been calculated on the assumption that it should be caused by the temperature variation of the density of free charge carriers in the semiconductor. The results are compared, for an example, with the experimental data of the capacity of copper oxide rectifiers, which are measured by superimposing a small alternating voltage on the d.c. bias voltages, at the several temperatures between −160°C and +60°C, and are analysed on the assumption that there exist some donor impurities in the bulk cuprous oxide layer in addition to the usual acceptor type. The comparison makes it clear that the equation derived theoretically can successfully explain the following facts: (1). At lower temperatures, the magnitude of capacity increases with increasing temperature, and reaches a maximum at a certain temperature and then begins to decrease at higher temperatures. (2). But, the temperature at which the magnitude of capacity reaches a maximum experimentally is slightly higher than that which the theoretical equation predicts. (3). The measurements at −110°C and −160°C show that the values of the capacity at these temperatures may be regarded as those affected by the temperature variation in the electrical resistivity of the bulk Cu2O layer rather than the values of the pure barrier capacity. (4). The absolute value in the temperature variation of a barrier capacity expected from the derived equation is about 250μμ farads/cm2 for copper oxide rectifiers, with −0.5 volt d.c. bias voltage applied between 0°K and 300°K, and this value agrees comparatively well with the experimental results. (5). The variations in capacity are dependent upon the d.c. bias voltage applied and will be smaller when the bias voltage becomes larger.View full abstractDownload PDF (1048K) -
Kayako Tanaka, Hidetaro Abe, Ken-ichi Hirano1955 Volume 10 Issue 6 Pages 454-458
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVariations of the Young’s modulus and the internal friction during the aging of the supersaturated solid solution of 20 weight percent silver in aluminium has been examined on polycrystalline specimens by the high frequency method at about 13 kilocycles per second; both isothermal aging curves and heating curves have been obtained.
It has been found that the formation of the Guinier-Preston zone results in decrease of the Young’s modulus, whereas precipitation of the new phase results in increase of it. The results have been discussed based on the point of view that the formation of the Guinier-Preston zone is not a preliminary stage of the precipitation process.
The effect of the aging on the internal friction measured at the room temperature has been found negligible.
Further, temperature variations of the Young’s modulus and the internal friction have been examined on the pure aluminium specimen in comparison with those of the present alloy.View full abstractDownload PDF (676K) -
Masao Sawada, Kenjiro Tsutsumi, Toshio Shiraiwa, Masayoshi Obashi1955 Volume 10 Issue 6 Pages 459-463
Published: June 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe prepared the simultaneously electro-deposited Ni-S containing 0, 9, 13, 17 and 25 wt.% sulfur and studied their crystalline forms by X-ray diffraction patterns. The diffraction patterns of Ni-S containing 13 and 17% S show a uniform fog, and 7% S shows a halo, and 0 and 25% S are the same as those of Ni and Ni3S2 respectively. All amorphous samples crystallized after they had been heated to 180°C, and their diffraction patterns show the crystalline states of the two phase region of Ni and Ni3S2. The electrical resistances of these samples were measured in a vacuum furnace and in an oil bath. The resistances of these samples containing 9, 13 and 17% S gradually decrease as the temperature increases and suddenly drop at 180°C, then follow the usual behavior of the common metals for both increasing and decreasing temperatures. In the case of 0% S it does not differ from that of the pure nickel. We conclude that the amorphous state has the structure of a certain regularity, and that 180°C is the transition point of the amorphous Ni-S to the perfect crystal.View full abstractDownload PDF (1900K) -
The Amorphous State of the Binary System of Nickel-Sulfur. II.Masao Sawada, Kenjiro Tsutsumi, Toshio Shiraiwa, Masayoshi Obashi1955 Volume 10 Issue 6 Pages 464-468
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe prepared the simultaneously electrodeposited Ni-S containing 0, 9, 13, 17 and 25 wt.% sulfur and studied their crystalline forms and electrical resistances. Of these samples, those containing 9, 13 and 17% sulfur are amorphous and crystallize when heated to 180°C. The above results were reported in paper I.
We photographed the fine structures of Ni K X-ray absorption spectra in the amorphous and crystalline states of the same samples. We measured the wave-lengths of the fine structures of the Ni K absorption edge and intensities of their non-absorption maxima. We find the fine structures in the amorphous states; their shapes and wave-lengths show a similarity to those shown by the substances which have undergone crystallization. But generally, in the amorphous state, the fine structure is less pronounced at the shorter wave-length side than in the crystalline state.
We conclude from the above results and previous results in paper I that the amorphous Ni-S is the aggregate state of fine crystals, and that the crystal size influences the region of the extended fine structure.View full abstractDownload PDF (1696K) -
Hiroshi Fujiwara, Takao Ichiki1955 Volume 10 Issue 6 Pages 468-471
Published: June 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy using Prof. T. Fujiwara’s method, we have succeeded in producing the aluminium single crystal foils (0.06×5×100 mm3, 99.53% in purity) having their definite crystallographic orientations; for example, they are orientated in [110]–(110) or [110]–(100) or Ds or Dd, etc.
It was found that the easiness with which a single crystal foil was produced was remarkably different according to its crystallographic orientation. For the specimens Ds and Dd, it was also found that the bending behaviors caused by some mechanical shock were different from each other.View full abstractDownload PDF (492K) -
Yutaka Shigemitsu1955 Volume 10 Issue 6 Pages 472-482
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn this paper fundamental aspects of our statistical theory of turbulence are described. At first, some experimental observations are made on the production and transition to turbulent flow, and in view of those observations the turbulent flow is defined as an irregular motion of many large and small vortices. Next, kinematical expressions of intensity and scale of turbulence are given in the form of area integrals of product of mean velocities \barV*2 and \barV*′2 in many vortices and a probabity density function P, where the latter means physically the character of an irregularity in the relative arrangement of many vortices. With these expressions and the Reynolds equations introduced, fundamental equations of motion of turbulence are set up. Then, the statistical principle to determine the functional form of P is mentioned by referring to the physical meaning of the ergodic hypothesis in the statistical mechanics. At last, hydrodynamical discussions on \barV*2 and \barV*′2 are made with reference to the known solution of the Navier-Stokes equations for a certain vortex motion.View full abstractDownload PDF (2720K) -
Saburô Asaka1955 Volume 10 Issue 6 Pages 482-492
Published: June 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSImai’s thin-wing-expansion method is presented in somewhat modified and extended form. Then the method is applied to the flow of a compressible fluid past a symmetrical circular are aerofoil. Analytical expressions for the velocity potential and the velocity distribution over its surface are obtained. For the profile of thickness ratio t=0.1, numerical computations have been carried out at M=0.7 and 0.8. The present method has been proved very useful, because its procedures are simple and clear, and because its convergency and accuracy are very good up to considerably high Mach numbers. Comparisons with the theoretical results for related profiles as well as experimental data have been made.View full abstractDownload PDF (1132K) -
Seiichi Yoshimatsu, Chikashi Kanzaki, Sumiaki Ibuki, Naomichi Murai1955 Volume 10 Issue 6 Pages 493
Published: June 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (144K) -
Inosuke Sumoto1955 Volume 10 Issue 6 Pages 494
Published: June 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (124K)
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