JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
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Volume 73, Issue 5
Displaying 1-9 of 9 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
RESEARCH ACTIVITIES
PAPERS (Articles)
RESEARCH PAPERS
  • Optimal Design of a Pico-hydroelectric Power Generation System with a Spiral Water Wheel at a Japanese Irrigation Canal and a Validation Experiment
    Teppei OKAMURA, Masao TAKANO, Isamu MIZUNO, Kazuji SUZUKI, Hiroshi TAK ...
    2011 Volume 73 Issue 5 Pages 305-312
    Published: September 01, 2011
    Released on J-STAGE: May 08, 2013
    DOIhttps://doi.org/10.11357/jsam.73.305
    JOURNAL FREE ACCESS
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    A spiral water wheel, which is a type of water mill, was a common power source for agricultural work in the Toyama Plain prior to the Second World War. In this study, we proposed a mechanical model of spiral water wheel when only a part of the water wheel sinks, and designed a pico-hydro electric power generation system with a spiral water wheel operated with an optimal gear ratio by utilizing the mechanical model and the generator’s characteristic data. Additionally, an experiment to verify the design method of the pico-hydro electric power generation system with a spiral water wheel was conducted. Voltages, electric currents, and rotational speeds of the water wheel were measured at each resistance, and almost all the values agree with the calculations of the mechanical model within the characteristic data of the generator.
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  • Determination of Moisture Diffusion Coefficient Based on Three-Dimensional Rice Grain Model
    Haruka SATO, Fumihiko TANAKA, Toshitaka UCHINO, Jonathan PEREZ, Takuma ...
    2011 Volume 73 Issue 5 Pages 313-320
    Published: September 01, 2011
    Released on J-STAGE: May 08, 2013
    DOIhttps://doi.org/10.11357/jsam.73.313
    JOURNAL FREE ACCESS
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    In the present work, a three-dimensional (3D) replica of rice geometry was reconstructed from tomographic images and applied to model the diusion of moisture in rice grains. The purpose of this study was to determine the diusion coecient of rice using reconstructed 3D geometry. As for a constant diusivity model, the modeling of water absorption was based from experimental data of moisture diusion in rice soaked at various temperatures (25,35 and °C). Results showed that the calculated diusion coecient at each respective temperature had Arrhenius-type temperature dependency. Comparison between the calculated diusion coecients for reconstructed rice geometry with diusion coecients using an innite plane sheet and sphere diusion models was shown to be satisfactory in describing the moisture diusion characteristics of rice. We also developed a moisture sorption model with variable diusion coecient as a function of temperature and moisture content.
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