Oyo Buturi
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Print ISSN : 0369-8009
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Volume 33, Issue 4
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Gunji SHINODA
    1964 Volume 33 Issue 4 Pages 225-227
    Published: April 10, 1964
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.225
    JOURNAL FREE ACCESS
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  • Optical Resonators as Laser Cavities
    Norio KARUBE, Toshi AMBE, Masahide KAMIYAMA
    1964 Volume 33 Issue 4 Pages 228-244
    Published: April 10, 1964
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.228
    JOURNAL FREE ACCESS
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  • Investigation on the Rupture of Concrete Structure (I)
    Detection of Crack
    Ikuo IKEDA
    1964 Volume 33 Issue 4 Pages 245-250
    Published: April 10, 1964
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.245
    JOURNAL FREE ACCESS
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    For bending fracture test of concrete structures, it is very important to detect the cracks originated in the structure before the actual fracture occurs. For the detection of cracks, a mechanical method, instead of the visual method that is being practised, is devised by the use of an extremely sensitive receiver of vibrating acceleration. Experimentally, certain unusual forms of vibration associated with the energy transfer are observed by the initiation of impulse. The natural frequency of vibration of the test piece seems to be superposed on a very low frequency about 30 cycles per second. It is interesting to note that there is a linear relation between the cracking stress and the square value of the maximum amplitude obtained on a synchroscope.
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  • Hyperbolic Color-Difference Formulae
    Yoshio SUGIYAMA
    1964 Volume 33 Issue 4 Pages 250-254
    Published: April 10, 1964
    Released on J-STAGE: February 20, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.250
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    The expression for the color-difference line elements in a uniform color space in cylindrical co-ordinates as is the case of the Munsell system is modified to conform to the hyperbolic geometry as
    Δs2=Δr2+(1+_??_)_??_Δθ2+Δz2
    where r is the distance from the light source to the sample on the MacAdam (u, v) diagram, and for practical use it is rewritten as
    ΔE={[106_??_1/2(_??_+_??_|_??_|2)]+[10Δ(vY)]2}1/2
    In spherical coodinates as is the case of the DIN color system, the above expression becomes
    Δs2=Δr2+g1(r)_??_Δθ2+g1(r, θ)_??_sin2θΔφ2
    For determination of the functional forms of g1(r) and g2(r, θ), psychophysical experimental data on the color-difference are lacking.
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  • Ice-Forming Efficiency of AgI-NaI and AgI-KI Smoke
    Sukita NAKAHARA, Kunio SAKATE
    1964 Volume 33 Issue 4 Pages 255-259
    Published: April 10, 1964
    Released on J-STAGE: February 20, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.255
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    For artificial stimulation of rain by AgI particle seeding, mere heating of AgI of electric heater or burner leaves as much as 20_??_30% of Ag by dissociation of AgI into Ag and I. To cope with this uneconomical process, addition of 10% Nal or KI to AgI is tried. The vaporising tem-perature being kept the same, this addition is found to double or more the number of effective ice nuclei and that the ice nucleation of the cloud becomes more effective while the weakening effect of ultraviolet rays of light is not appreciably enhanced by it.
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  • Dielectric and Temperature Characteristics of Solid Solutions of Tungsten Oxide
    Masaichi TANAKA
    1964 Volume 33 Issue 4 Pages 260-263
    Published: April 10, 1964
    Released on J-STAGE: February 20, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.260
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    To improve dielectric and temperature characteristics of WO3, its solid solutions are prepared by the addition of various inorganic oxides. Solid solutions with 0.5_??_2 mole 9 Fe2O3, 1_??_20 mole TiO2, 3_??_10 mole % MgO and 1_??_10 mole % PbO show remarkable improvement on the characteristics. As olid solution with 26 mole % Fe2O3 shows an anomalous rise of dielectric constant, which seems interesting from the viewpoint of solid-state physics.
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  • Glass for Optical Maser (1)
    Eizo KANAI, Masahiko ISHIYAMA, Shigeo SHIONOYA, Eiichiro NAKAZAWA, Sus ...
    1964 Volume 33 Issue 4 Pages 264-268
    Published: April 10, 1964
    Released on J-STAGE: February 20, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.264
    JOURNAL FREE ACCESS
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    Laser glass containing neodium is prepared and the stimulated emission is observed at room temperature. As the base glass, silicate glass is chosen for it gives the fluorescence of Nd3+ the best. Glass rods with 2_??_5% Nd2O3 have a low threshold value which is expected from the relation of fluorescence to neodium concentration.
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  • The Effect of Natural Convection on the Rate of Evaporation of Water
    Masabumi UEDA, Kamekichi SHIBA
    1964 Volume 33 Issue 4 Pages 269-273
    Published: April 10, 1964
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.269
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    This paper describes the results of experiments on the effect of natural convection on the rate of evaporation from wetted plane surfaces. The evaporating surfaces employed are upward-facing horizontal circular disks 2 to 60 cm in diam, a downward-facing horizontal circular disk 60 cm in diam, and a vertical plate 150 cm high and 30 cm wide. The distributions of humidity close to the surfaces are measured in still air and the effective thicknesses of diffusion layers are determined.
    It is found for the various upward-facing disks that the relation of the effective thickness δ vs. the distance x from the circumference gives a single curve: δ increases with x at x<10cm and remains constant at x>10cm. The relation of δ vs. x for the downward-facing disk is similar except near the circumference where δ is somewhat thicker than for the upward-facing disks. For the vertical plate it is shown that the flow of air due to natural convection is laminar at x (the vertical distance from the lower edge) <5cm and it becomes turbulent in the upper region.
    The results are well correlated by dimensionless equations of the form
    x/δ=c(GrD•Sc)n.
    Values of c and n are obtained experimentally.
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  • A New Type of Oscillation in Point-contact Diodes
    Tetsuya ARIZUMI, Takao WADA
    1964 Volume 33 Issue 4 Pages 274-282
    Published: April 10, 1964
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.274
    JOURNAL FREE ACCESS
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    In point-contact semi-conductor diodes which are generally used for the detection of microwave power, a new type of oscillation is generated at 9GC/sec and 35GC/sec when both amplitude and frequency of the microwave field change discontinuously. No oscillation can be observed up to frequencies of 2GC/sec. The oscillations in germanium diodes take place more easily at -60°C than at room temperature.
    The oscillation frequency-differs from one diode to another, ranging from 5 KC to 30 MC. It also changes discontinuously against diode currents, indicating that there are many different modes of oscillations.
    The oscillation may be originated in the immediate vicinity of the contact. It is pointed out that there are analogies in several respects between this oscillation and the moving striation in a gaseous positive column.
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  • Design of a New Double Focusing Mass Spectrometer with Inclined Plane Magnet Pole-Faces and a Spherical Condenser
    Takashi SHIKATA
    1964 Volume 33 Issue 4 Pages 283-285
    Published: April 10, 1964
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.33.283
    JOURNAL FREE ACCESS
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