Shugo Ishikawa

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Under the Antarctic coastal fast ice a light trap proved to be promising device for collecting not only planktonic animals, but also micronektonic animals like krill which have been rarely collected with tow nets. Sampling was conducted at night from May through November, 1984 in Kitano-ura Cove off the East Ongul Island in Lützow-Holm Bay. Design of the(More)
The triangle tooth and the wedge head tooth geometries, which are able to reduce the normal force, are proposed, and the thrust force and the normal force for various tooth geometries are examined. On the basis of analysis and experimental results, the following conclusions are obtained: the normal force of the wedge head tooth is greatly reduced as(More)
Accretionary prisms are mainly composed of ancient marine sediment scraped from the subducting oceanic plate at a convergent plate boundary. Large amounts of anaerobic groundwater and natural gas, mainly methane (CH4) and nitrogen gas (N2), are present in the deep aquifers associated with an accretionary prism; however, the origins of these gases are poorly(More)
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