This paper investigated how production task combined with teacher feedback (in the form of recasts) affects child second language development, and effects complexity on their performance. 92 learners English in three intact classes were assigned to tasks different (simple, +complex, ++complex). In response errors use present third person singular verb forms, participants received recasts. L2 de...

The amount and states of water in a polymer electrolyte significantly affect the material's morphology as well its mechanical transport properties, thus determine performance many important applications such fuel cells, electrolyzers, other electrochemical energy conversion devices. In this study, recast H+-Nafion® films were characterized using attenuated total internal reflection FTIR (ATR-FT...

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OBJECTIVE To evaluate the effects of recasting on the biocompatibility of a commercially available Ni-Cr alloy. METHODS The alloy tested was cast and subsequently recast four more times. For each cast condition, 24 disk shaped specimens were fabricated (5 mm in diameter, 0.5 mm in thickness). All the recasting was performed without adding new alloy. After the first cast and following each rec...