Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
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Special Issue
Volume 68, Issue 3
Displaying 1-2 of 2 articles from this issue
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  • Modulation in Co-åkermanite
    Kenji HAGIYA, Masaaki OHMASA, Kazuaki IISHI
    1992 Volume 68 Issue 3 Pages 25-29
    Published: 1992
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.68.25
    JOURNAL FREE ACCESS
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    Diffraction patterns of synthetic Co-åkermanite, Ca2CoSi2O7, reveal distinct satellite reflections at room temperature. An incommensurate modulation in this material has been determined by five-dimensional refinement of the structure. The basic structure is tetragonal P421m, unit-cell dimensions a=7.8417(6), c=5.0249(3)Å, V=308.99Å3, Z=2, M=307.26, Dx=3.302g•cm-3, MoKα with graphite monochromator, μ=47.7cm-1, F(000)=302, R=0.049 for 734 unique reflections. The modulated structure is also tetragonal Pp421mp4mg, k1=0.2913×(a*+b*), k2=0.2913×(-a*+b*), where k1, k2 wave vectors and a*, b* reciprocal lattice vectors of the basic structure, R=0.098 for 3915 unique reflections. The modulation is caused by the shifts of the constituent atoms.
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  • Spiral Vector Theory of Salient-Pole Synchronous Machine
    Sakae YAMAMURA
    1992 Volume 68 Issue 3 Pages 30-35
    Published: 1992
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.68.30
    JOURNAL FREE ACCESS
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    Almost all electric energy of electric industries is generated by synchronous generators, which are either salient-pole synchronous generators or have saliency to some extent. As the rotor rotates, inductances of the three phase winding vary due to the saliency and it makes analysis of generator performance difficult. Even adequate computer simulations have not been provided by the conventional theories, such as the d, q axis theory. In this paper the spiral vector method will be applied to analyses of the salient-pole synchronous generator, and adequate analytical solutions and computer simultations will be derived.
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