Oyo Buturi
Online ISSN : 2188-2290
Print ISSN : 0369-8009
Volume 33 , Issue 12
Showing 1-17 articles out of 17 articles from the selected issue
  • Moriso HIRATA
    1964 Volume 33 Issue 12 Pages 861
    Published: December 10, 1964
    Released: February 09, 2009
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  • Hiromichi KAMITSUBO
    1964 Volume 33 Issue 12 Pages 862-874
    Published: December 10, 1964
    Released: February 09, 2009
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  • Seiji OKAYAMA
    1964 Volume 33 Issue 12 Pages 875-882
    Published: December 10, 1964
    Released: February 20, 2009
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    Effective emissivity of a cylindrical cavity source has already been known by approximation methods or highly accurate numerical solutions. For a cavity source with an arbitrary shape, the calculation by De Vos' method is more useful than ordinary one. In this paper the effective emis-sivity of a conical cavity source is evaluated by De Vos' method.
    It is shown that the average effective emissivity of the bottom of a conical cavity source with its opening closed by a lid with a circular hole in its center is greater than that of a cavity source of cylindrical shape with equal max. sizes (i.e., max. diameter and length). Average effective emissivity of this conical cavity is given by
    1-(_??_+_??_),
    where _??_=2π(α')2·_??_rω00y(l-y)dy/{(l-y)2+(yα')2}3/2, _??_<<_??_
    α'=tan α, α=half apex angle, l=length of cavity, p=ratio of max. radius of the cavity to radius of the circular hole, rω00=reflectivity of cavity surface for the radiation from hole lid back to hole lid.
    When the surface has perfect diffusivity, _??_1, and _??_2 are replaced by _??_1 and _??_2 respectively, and we have
    _??_=2ρ(α')2/√1+(α')2_??_y(l-y)dy/{(l-y)2+(yα')2}2
    where ρ is the reflectivity for perpendicular incidence.
    _??_=4ρ2(α')6l/1+(α')2_??_dy_??_dx×xy2(x_??_y)(l-x)/{(l-x)2+(xα')2}2{(x-y)2+(xα')2}2
    Numerical values of _??_1, _??_1' and _??_2' for ρ=1.00, 0.75, 0.50 and 0.25 and l=2, 4, 6, 8, and 10 are given in tables and shown by graphs. It seems that the effective emissivity of conical cavity increases when the surface is not perfectly diffusive.
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  • Akira HATTORI
    1964 Volume 33 Issue 12 Pages 882-886
    Published: December 10, 1964
    Released: February 09, 2009
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    With the view to improving the performance of inversion viewer, a method of measuring of the optical transfer function (OTF) of infrared quenching fluorescent screen is described. If the resultant OTF of photographic lens, infrared quenching fluorescent screen and microscope is DR(ω), and that of photographic lens and microscope is DLM(ω), then the OTF of the screen DF(ω) is given by DF(ω)=DR(ω)/DLM(ω). To practice the principle, an apparatus for measuring DR(ω) and DLM(ω) has been constructed and the method of obtaining OTF of the screen is described. The OTF of the infrared quenching fluorescent screen (ZnS:Cu:Co screen) with various thickness of the coated layer is measured. Furthermore, OTF of ZnS:Cu:Co screen is also measured while changing the intensity of the infrared rays used for forming the inversion image of the object slide on the ZnS:Cu:Co screen. The results thus obtained are as follows:
    (1) The thickness of the coated layer of ZnS:Cu:Co screen, which makes the value of OTF the highest, is about 4mg/cm2.
    (2) The OTF of ZnS:Cu:Co screen varies with the intensity of infrared rays. The value of OTF increases with the increase of intensity of the infrared rays at low spatial frequencies whereas it decreases at high spatial frequencies.
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  • Shin'ichi TANEYA
    1964 Volume 33 Issue 12 Pages 887-894
    Published: December 10, 1964
    Released: February 20, 2009
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    A study on the flow of powder is made with a double cylinder type viscometer. By rotating the outer cylinder, both the torque exerted on the inner cylinder and the amplitude of torque fluctuation are measured. Experiment is made with a mixture of talcum powder and glass granules and with fatty acid smeared glass granules. By representing the torque in the early stage of rotation by To, that in the ultimate settled stage by T and that at the N th rotation by Tn, the relation
    _??_
    is found to hold. The constant K represents the fluidity of powdered mass and is independent of the speed of rotation in most cases. With fatty acid smeared glass granules, it decreases with the increase of speed of rotation due to clotting of particles by cohesion. The internal friction coeffi-cient of powdered mass calculated from T of the above equation is in good agreement with the result obtained by shearing box method. With powder mixtures, the torque fluctuation is of a complicated pattern because of separation of components while rotated. With fatty acid smeared glass granules, the amplitude of torque fluctuation decreases with the increase of amount of fatty .acid on granules.
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  • Hajime ISHIMURA
    1964 Volume 33 Issue 12 Pages 895-904
    Published: December 10, 1964
    Released: February 20, 2009
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    A new method presented in the paper is exact and convenient in correcting the observed values of mass of objects for air buoyancy in laboratory weighing. The extent of accuracy one must know of the densities of air, object and weights are found on nomographs from the approximate density value. Another nomograph gives the value of air buoyancy correction factor k from density values of 2_??_3 significant figures. With this nomograph, which is different from the case of conventional tables, k can be found for almost all combinations of object and weights. For a more accurate correction, one must know more accurate values of density, the density of air in particular, and in such a case, k is calculated by a theoretical equation. The density of air depends on various factors. In the usual method, in which the density is calculated from factors P, T and composition of air, 3±10-4 is concluded to be the limit of accuracy. Multilayer adsorption of water vapor also affects the weighing accuracy. The density or mass allowed for the tare of a weighing vessel can also be de-termined from the nomographs. Among the balances of various types, the balance of gravity type is most suited to precise weighing.
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  • Itsuki BAN, Miyosi HARADOME, Yosiaki TAKETA
    1964 Volume 33 Issue 12 Pages 905-908
    Published: December 10, 1964
    Released: February 09, 2009
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  • Shiro FUJITA
    1964 Volume 33 Issue 12 Pages 908-910
    Published: December 10, 1964
    Released: February 09, 2009
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  • Yuji SATO, Daisuke HAYASHI, Hiroshi FUKUDA
    1964 Volume 33 Issue 12 Pages 910-912
    Published: December 10, 1964
    Released: February 09, 2009
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  • Yuzo YASHIRO
    1964 Volume 33 Issue 12 Pages 912-913
    Published: December 10, 1964
    Released: February 09, 2009
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  • [in Japanese]
    1964 Volume 33 Issue 12 Pages 915
    Published: December 10, 1964
    Released: February 09, 2009
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  • [in Japanese]
    1964 Volume 33 Issue 12 Pages 916
    Published: December 10, 1964
    Released: February 09, 2009
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    Download PDF (133K)
  • [in Japanese]
    1964 Volume 33 Issue 12 Pages 917
    Published: December 10, 1964
    Released: February 09, 2009
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    Download PDF (109K)
  • [in Japanese]
    1964 Volume 33 Issue 12 Pages 918
    Published: December 10, 1964
    Released: February 09, 2009
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  • Shoji TANAKA
    1964 Volume 33 Issue 12 Pages 919-926
    Published: December 10, 1964
    Released: February 09, 2009
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  • Satoru SUGANO, Kiyoshi AOYAGI, Akira MISU
    1964 Volume 33 Issue 12 Pages 927-930
    Published: December 10, 1964
    Released: February 09, 2009
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  • Masamoto NAKAMURA, Kakuji YAMAMOTO
    1964 Volume 33 Issue 12 Pages 931-934
    Published: December 10, 1964
    Released: February 09, 2009
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