著者

佐藤 成男 黒田 あす美 佐藤 こずえ 熊谷 正芳 ステファヌス ハルヨ 友田 陽 齋藤 洋一 轟 秀和 小貫 祐介 鈴木 茂

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.104, no.4, pp.201-207, 2018 (Released:2018-03-31)

参考文献数

20

被引用文献数

10

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To investigate the characteristics of dislocation evolution in ferritic and austenitic stainless steels under tensile deformation, neutron diffraction line-profile analysis was carried out. The austenitic steel exhibited higher work hardening than the ferritic steel. The difference in the work hardening ability between the two steels was explained with the dislocation density estimated by the line-profile analysis. The higher dislocation density of the austenitic steel would originate from its lower stacking fault energy. Dislocation arrangement parameters indicated that the strength of interaction between dislocations in the austenitic steel was stronger than that in the ferritic steel. This would mainly originate from the difference in dislocation substructures; while dislocation tangle, which can be prompted by the cross slip, was expected in the ferritic steels, highly dense dislocation walls induced by planar glide of dislocations as well as the tangle were expected in the austenitic steel. It was confirmed that the stronger interaction between dislocations in the austenitic steel resulted in the smaller strain field of dislocation. Consequently, the coefficient for the root square of dislocation density in the Bailey-Hirsh equation became smaller in the austenitic steel. X-ray diffraction line-profile analysis was also carried out for the tensile-deformed specimens. The dislocation arrangement parameter evaluated by X-ray diffraction was smaller than that evaluated by neutron diffraction. This would be caused by the difference in the relationship between the loading direction and the scattering vector. On the other hand, the dislocation density evaluated by both methods was almost identical.

著者

渡部 喬之 鈴木 久義 小貫 祐介 長島 潤 迫 力太郎 川手 信行

出版者

公益社団法人 日本リハビリテーション医学会

雑誌

The Japanese Journal of Rehabilitation Medicine (ISSN:18813526)

巻号頁・発行日

pp.17027, (Released:2018-09-28)

参考文献数

21

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目的:脳卒中患者におけるやむを得ない転倒判定チェックシート(以下,判定シート)の,信頼性と予測的妥当性を検討した.方法:検者5名で脳卒中転倒者20例に対し判定シートを評価,また2名は同様の対象に再評価を行い,検者間でのFleissのκ係数,検者内でのCohenのκ係数を算出した.予測的妥当性の検討は,対象の脳卒中転倒者123名の中から判定シートを用いてやむを得ない転倒者を抽出し,その他の転倒者との間で,再転倒割合,運動FIMを比較した.結果:判定結果のFleissのκ係数は0.838,Cohenのκ係数は1.000であり,高い検者間・検者内信頼性を認めた.やむを得ない転倒者の再転倒割合は,その他の転倒者に比べ有意に低かった.運動FIMは有意に高く,やむを得ない転倒者は一定以上の能力回復を認める傾向にあった.考察:判定シートの信頼性と予測的妥当性が高いことが示された.判定シートで転倒の質を評価することは,転倒後の患者指導などに使用できると考える.