Journal of the Society of Agricultural Structures, Japan
Online ISSN : 2186-0122
Print ISSN : 0388-8517
ISSN-L : 0388-8517
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Volume 52, Issue 1
Vol. 52, No. 1 (Ser. No. 168)
Displaying 1-3 of 3 articles from this issue
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  • Investigation of Influence Factors for Decolorization of Brown Pigments in Food Biomass by Electrochemical Oxidation
    Gen YOSHIDA, Zhengxuejiu LI, Ikko IHARA
    2021 Volume 52 Issue 1 Pages 1-8
    Published: 2021
    Released on J-STAGE: September 28, 2023
    DOIhttps://doi.org/10.11449/sasj.52.1_1
    JOURNAL OPEN ACCESS
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    In food manufacturing, large quantities of food biomass, including dark brown wastewater, are emitted. When reusing such food biomass, it is necessary to remove coloring components. In this study, we examined the decolorization by electrochemical oxidation. The effects of current intensity, sodium chloride concentration and initial chromaticity on decolorization performance and energy consumption were investigated for treatment of caramel and melanoidin as coloring components. As the current intensity increased, the processing speed increased and the decolorization performance improved. On the other hand, the energy consumption increased under the condition where the current intensity was large. As the concentration of sodium chloride increased, the decolorization performance improved and the energy consumption decreased. It was suggested that the decolorization process that can reduce energy consumption can be constructed by controlling the concentration of sodium chloride.
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  • Field Survey of Greenhouses Damaged by Typhoon Faxai in 2019
    Hideki MORIYAMA, Masahisa ISHII, Ryota TSUCHIYA
    2021 Volume 52 Issue 1 Pages 9-22
    Published: 2021
    Released on J-STAGE: September 28, 2023
    DOIhttps://doi.org/10.11449/sasj.52.1_9
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    Typhoon Faxai, the Reiwa 1 Boso Peninsula Typhoon, hit Kanto Region in 2019 caused damages more than 36 billion yen on greenhouses in Chiba prefecture. We surveyed multiple side-by-side pipe-framed greenhouses and multi-span steel frame greenhouses damaged by the Typhoon and Typhoon Phanfone to elucidate the effect of layout condition on behaviors of damaged greenhouses and on air flow pattern around greenhouses. The damage causes of greenhouses were positive pressure on windward side wall or side gable, negative pressure and re-attachment flow on roofs of leeward greenhouses, and contraction flow. For the measures against strong wind, it is important that appropriate direction of shelter net, addition of bracing on pipe-framed greenhouse, and maintenance of depth of foundations of steel greenhouse.
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  • Acoustic Radiation for Suppressing Mating Behavior of Whiteflies Using Acoustic Signals
    Yasuhiko NISHIJIMA, Koichi MIZUTANI, Tadashi EBIHARA, Naoto WAKATSUKI, ...
    2021 Volume 52 Issue 1 Pages 57-63
    Published: 2021
    Released on J-STAGE: September 28, 2023
    DOIhttps://doi.org/10.11449/sasj.52.1_57
    JOURNAL OPEN ACCESS
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    Whiteflies are major pests damaging a wide variety of crops. Whiteflies use sound for communication in their courtship process, and their acoustic communication plays an important role in their mating process. From these features, the use of acoustic radiation may disturb their mating behavior. Hence, in this paper, we examined the influence of acoustic radiation on the mating behavior of whiteflies by emitting the acoustic signal of whiteflies artificially. The obtained results suggest that the mating behaviors of whitefly can be suppressed when rms sound pressure of 28 mPa / rms vibration amplitude of 83 nm.
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