Journal of the Society of Agricultural Structures, Japan
Online ISSN : 2186-0122
Print ISSN : 0388-8517
ISSN-L : 0388-8517
Volume 29, Issue 1
Displaying 1-4 of 4 articles from this issue
  • Configuration Factors of a 27kg Pig to Rectangular Planes on the Side, Front or Rear Wall
    Masayoshi MINOWA
    1998 Volume 29 Issue 1 Pages 1-8
    Published: June 25, 1998
    Released on J-STAGE: September 05, 2011
    JOURNAL FREE ACCESS
    The radiation configuration factors of a pig are necessary for the estimation of radiation exchange rate between the pig body and surrounding objects. The configuration factors of the polyhedric surface-model pig, which was 27kg in live weight, in a standing posture and represented by the three dimensional coordinates of many surface-mounted triangular patches, were numerically calculated by computer graphics. The law of solid-angle projection and the method of numerical integration were used.
    The relative errors of calculated configuration factors were estimated to be about 1% or less by the law of summation for configuration factors and the law of propagation of errors. The graphs for determining configuration factors of a 27kg pig to rectangular planes on the side, front or rear wall were presented as a function of the size of the plane and the distance between the plane and the pig.
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  • Configuration Factors of a 27kg Pig to Rectangular Planes on the Ceiling or the Floor
    Masayoshi MINOWA
    1998 Volume 29 Issue 1 Pages 9-14
    Published: June 25, 1998
    Released on J-STAGE: September 05, 2011
    JOURNAL FREE ACCESS
    The radiation configuration factors of a pig are necessary for estimatig radiation exchange rate between the pig body and surrounding objects. The configuration factors of the polyhedric surface-model pig, which was 27kg in live weight, in a standing posture and composed of many surface-mounted triangular patches, were numerically calculated by using the procedure in the second paper and the law of summation for configuration factors. The figures for determining configuration factors of a 27kg pig to rectangular planes on the ceiling, or on the floor in direct contact with or below the bases of its hoofs were presented with the size of the plane and the distance between the plane and it as parameters.
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  • Takayoshi AKINAGA, Seishi KAWASAKI, Yoshihiro KOHDA
    1998 Volume 29 Issue 1 Pages 15-20
    Published: June 25, 1998
    Released on J-STAGE: September 05, 2011
    JOURNAL FREE ACCESS
    A returnable container system was introduced for vegetables produced in Okinawa prefecture which was then smoothly distributed within the prefecture. The returnable container system has reduced packaging costs, labor costs, and affected the preservation of vegetables. However it has been discussed that the system in Okinawa be terminated due to its low recovery ratio, losses due to breakage and abuses in its use. Therefore, the actual distribution conditions of the containers were investigated, and the strength of containers with time based on dropping tests and compression tests were measured and reported. It was determined from the results of the strength test that the container strength was not a serious obstacle to their practical use.
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  • Hiromichi TOYODA, Hideki MORIYAMA, Tomoyuki SENO, Takaaki MAEKAWA
    1998 Volume 29 Issue 1 Pages 21-30
    Published: June 25, 1998
    Released on J-STAGE: September 05, 2011
    JOURNAL FREE ACCESS
    In order to study the design of wind load resistance for plastic greenhouse, the greenhouse damages by typhoon at Kume-island, Okinawa and Motono, Chiba was investigated. The result shows many collapse greenhouse frame and isolated footing at flat area. And the deformation and the buckling of the pitched roof was seen at the slope area. The difference of the greenhouse arrangement clearly made the difference of the details of collapse greenhouses.
    Then, we examined the process of the framework deformation using the method of the numerical analysis. From this result, we suggested the fundamental rules for greenhouse arrangement design and the measurement to counter the greenhouse destruction.
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