This study investigates the effects of bicycle safety training on primary school students’attitude toward safety and recognition of the importance of careful observation before crossing a road. The students were taught how to observe all around before crossing a road when riding a bicycle. The practical training encouraged the students to recognize importance of observing all around before crossing, but the training could not change the students' risk perception. Bicycle safety training for primary school students is discussed.

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The Pt/C electrocatalyst degradation mechanism was investigated by in situ transmission electron microscopy. The observation was conducted using a conventional analytical TEM equipped with a gas injection-specimen heating holder, simulating the cathode environment of PEFC by controlling the relative humidity of air supplied to the specimen. At low humidity (0%RH), the carbon support was oxidized from its surface without movement of Pt nano particles on the support. In contrast, at high humidity (94%RH), Pt nano particles on the support were observed to move actively, leading to coalescence and grain growth of the particles. The results clearly demonstrate that the relative humidity of air affects the degradation mechanism of a Pt/C electrocatalyst.

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[in Japanese]

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[in Japanese]

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