389 research outputs found

    CO_2 Methanation Catalysts Prepared from Amorphous Ni-Valve Metal Alloys Containing Platinum Group Elements

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    The amorphous Ni-valve metal (Ti, Zr, Nb and Ta) alloys containing a few at% of platinum group elements were activated by immersion into hydrofluoric acid and used for hydrogenation of carbon dioxide at 100-300℃. This surface activation led to formation of nanocrystalline surface alloys with high surface area, and to surface enrichment of platinum group elements on the titanium-, niobium- and tantalum-containing alloys, but not on the zirconium-containing alloys. The surface of the latter alloys was mainly composed of nickel. The activity and selectivity for methane formation on the titanium-, niobium- and tantalum-containing alloys were significantly affected by the difference in the platinum group elements; the ruthenium- and rhodium-containing alloys showed higher activity and selectivity for methane formation while the platinum-containing alloys exhibited the lowest activity for methane formation and produced mainly carbon monoxide. The zirconium-containing alloys showed the one order of magnitude higher activity for methanation of carbon dioxide in comparison with the titanium-, niobium- and tantalum-containing alloys and produced exclusively methane independent of platinum group elements contained. The alloying with zirconium seems very important to prepare the alloy catalysts having the extremely high activity

    発育発達過程に沿った子どもの運動あそび

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    研究ノー

    介護福祉士養成課程における「レクリエーション」の役割と課題

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    研究ノート介護福祉士養成課程の見直しが進む中、新しいカリキュラム案にレクリエーション科目がなくなる方向が示された。本稿では、介護福祉士養成課程における「レクリエーション」の役割と課題を明らかにするために、現介護福祉士課程、新しいカリキュラム案、ドイツ老人介護士教育課程を比較するとともに、(財)日本レクリエーション協会の実施した調査から、現場の介護福祉士のレクリエーションとの関わりを検討した。レクリエーション援助は「尊厳を支えるケアの実践」に重要な役割を果たすため、新しい統合されたカリキュラムの中でも、今まで果たしてきた役割を後退させることなく、生かしていくことが重要であり、そのためには、介護福祉士養成課程に関わる教員の連携が必要不可欠であると考えられた
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