Kazuhiko HOSOKAWA Tsukasa TOMABECHIIn order to optimize electricity generation capacity and determine the optimal attitude for photovoltaic systems installed in snowy areas, an onsite test module was installed and snow accumulation and electricity generation were measured. Snow accumulation on the module was only observed at installation angles of 45˚ and 60˚. When installed at an angle of 90˚, electricity generation decreased by approximately 20% during the snowfall season, increasing by a few percentage points during the summer at all three angles. Annual electricity generation only varied slightly between installation angles of 45˚ or 60˚ and 90˚.

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The purpose of this study is to obtain basic data for disaster prevention ． We

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Concerning the development of portable optical disk products, higher impact resistant of the optical pick-up is required. Conventionally, cut and try measures, mainly based on experiment were applied to these problems, and it took much time and cost. Therefore, we developed this drop impact analysis of the optical pick-up based on the Finite Element Method (FEM) and clarified the failure mechanism of the suspension wire breaking with drop impact. With this analysis method, we also developed a new optical pick-up with a curved suspension wire, and realized much higher impact resistance.