Oyo Buturi
Online ISSN : 2188-2290
Print ISSN : 0369-8009
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Volume 49, Issue 8
Displaying 1-14 of 14 articles from this issue
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  • [title in Japanese]
    Hiroyoshi SAITO
    1980 Volume 49 Issue 8 Pages 753
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.753
    JOURNAL FREE ACCESS
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  • Recent Advances in Isotope Separation
    Uranium Enrichment and Tritium Separation by Chemical Exchange and P;asma Separation
    Ryohei NAKANE
    1980 Volume 49 Issue 8 Pages 754-767
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.754
    JOURNAL FREE ACCESS
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    Isotope separation effect for uranium by chemical exchange had been found to be too small for practical applications. However, Japan developed recently a promising uranium en-richment process based on chemical exchange, which is an ion exchange reaction between uranous ion in an anion resin bed and uranyl ion in solution.
    Developement of a water-hydrogen exchange process has been eagerly anticipated as tech-nology for large scale separation of tritium. This paper reviews recent studies which have resulted in the developement of highly active hydrophobic platinum catalysts.
    The research concerning isotope separation in plasma has been in progress. In this area two schemes-plasma rotation and ion cyclotron resonance-show the most promissing results. However, one cannot presently be sure that these methods will lead to an economical large scale separation, because the physics is more complex than that involved in other separ-ation techniques.
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  • Precise Measurements of the PVT Properties of Fluids
    Koichi WATANABE
    1980 Volume 49 Issue 8 Pages 768-782
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.768
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    The necessity and importance of the precise PVT property measurements with respect to the technically important fluids are discussed in the light of a recent demand in various applications. Some of the thermodynamic backgrounds in the thermophysical properties research as well as the conventional techniques for the PVT property measurements are reviewed. In addition, some of the practical experience in the PVT property measurements by the present author and his group are also introduced.
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  • Fabrication of Ferroelectric PbTiO3 Thin Films by RF Sputtering
    Hiroki HAMADA, Hisao MOROOKA, Heihachiro HIRAI
    1980 Volume 49 Issue 8 Pages 783-790
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.783
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    PbTiO3, ferroelectric thin films deposited on substrates of platinum, sapphire, fused quartz and In2O3 coated fused quartz have been fabricated by rf sputtering. Relations of crystal structure in the films with sputtering conditions, thickness and heat treatment have been investigated by means of X-ray diffraction analyses. Dielectric properties vary with the heat treatment conditions and the film thickness grown. Typical properties obtained by a 4 hours heat treatment at 800°C for 1μm film are ε≈220, tan≈4%, the remanent polarization of ≈4.8 μC/cm2 and the coercive field of ≈86.8 kV/cm. Optical transmittance of the film in the visible range is as high as 80%. The transparency and high dielectric constant of this film allow to develop low threshold voltage. EL device.
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  • [title in Japanese]
    Takayuki SAITO, [in Japanese]
    1980 Volume 49 Issue 8 Pages 791
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.791
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 49 Issue 8 Pages 792
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.792
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 49 Issue 8 Pages 793
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.793
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 49 Issue 8 Pages 794
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.794
    JOURNAL FREE ACCESS
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  • Free Electron Laser
    Jun KONDO
    1980 Volume 49 Issue 8 Pages 795-801
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.795
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    Theoretical and experimental aspects of the free electron laser are reviewed. First, the spectrum of light emitted when the high-speed electron beam is traversed through a helical wiggler is discussed. When a light pulse is travelling along with the electron beam through the helical wiggler, the electrons are forced to emit light of the same frequency. The gain of intensity of light due to this induced emission is calculated. Then, some details of the Stanford experiment to operate a free electron laser using the induced emission is presented. Finally, problems concerning the free electron laser are discussed.
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  • Laser Spectroscopy of Polyatomic Molecules in Supersonic Free Jets
    Naohiko MIKAMI
    1980 Volume 49 Issue 8 Pages 802-812
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.802
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    A supersonic free expansion of polyatomic molecules seeded in an inert carrier gas has been regarded as an excellent technique to produce the isolated and ultracold molecules which satisfy the requirements of an ideal spectroscopic sample. The cooling effects in the supersonic molecular beam are briefly summarized. An experiment on aniline with a simple pulsed supersonic nozzle combined with a pulsed tunable UV light source is described as an example of the fluorescence excitation spectroscopy. Recent progress on the optical spectroscopy of polyatomic molecules by use of the seeded supersonic free jets is reviewed from the photochemical and the photohysical point of view. The molecular structures and the dynamical behaviors in the excited states of the stable molecules and the van der Waals complexes are discussed.
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  • Submillimeter-Wave Lasers and Their Applications
    Masanbou YAMANAKA
    1980 Volume 49 Issue 8 Pages 813-824
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.813
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    Present status of wavelength-fixed and wavelength-tunable lasers in the submillimeter-wave region is reviewed. The wavelength-fixed lasers include the discharge-pumped gas lasers and the optically-pumped gas lasers. The latter lasers have over 1, 500 lasing lines in the submillimeter-wave region, and are described in detail. The tunable submillimeter-wave lasers and coherent sources are overviewed, which are composed of semiconductor lasers, differencefrequency generators, optical parametric oscillator, two-photon mixing to generate the side band and Raman lasers. Applications of those lasers to a) the laser-isotope separation of UF6 molecules, b) the fusion-plasma diagnostics on electron density, ion temperature, etc. and c) the astronomy to detect interstellar molecules are discussed.
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  • Bistable Optical Devices
    Masakatsu OKADA
    1980 Volume 49 Issue 8 Pages 825-830
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.825
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  • Generation and Application of Phase-Conjugation Wavefront in the Range of OPtical Wavelength
    Naohiro TAN-NO, Hamio INABA
    1980 Volume 49 Issue 8 Pages 831-836
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.831
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  • Application of Thermal Lems Efffect to Molecular Spectroscopy
    Kiyokazu FUKE, Michiya ITOH
    1980 Volume 49 Issue 8 Pages 837-841
    Published: August 10, 1980
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.49.837
    JOURNAL FREE ACCESS
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