Trickle bed reactors are governed by equations of flow in porous media such as Darcy’s law and the conservation of mass. Our numerical method for solving these equations is based on a total-velocity splitting, sequential formulation which leads to an implicit pressure equation and a semi-implicit mass conservation equation. We use high-resolution finite-difference methods to discretize these eq...

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...

Based on the controversial beliefs among L2 teachers about effective corrective feedback (CF) strategies, recast and prompts as 2 kinds of CF have drawn the attention of L2 researchers(e.g., Braidi, 2002; Iwashita, 2003; Loewen & Philp, 2006; Panova & Lyster, 2002; Sheen, 2004). Despite these numbers of studies, debate continues to exist about their usefulness as a CF technique. Whereas recasts...

This study investigated the possible relationship between educational context and English Language Teaching (ELT) teachers’ corrective feedback preference. To this end, 42 Iranian EEFL teachers from some private language institutes and 39 Iranian EFL teachers from different schools in Shiraz, Iran participated in the study. The Questionnaire for Corrective Feedback Approaches (QCFAs) was ...

although explicit and implicit knowledge of language learners are essential to theoretical and pedagogical debates in second language acquisition (sla), little research has addressed the effects of instructional interventions on the two knowledge types (r. ellis, 2005).this study examined the relative effectiveness of explicit and implicit types of form-focused instruction (ffi) on the acquisit...

Inspired by the previous recast literature, this paper aims to investigate whether more explicit recasts are effective than implicit in second language grammar teaching and learning. Four empirical studies (two classroom-based two laboratory-based) on were reviewed. In studies, coded as or according their length, intonation, number of changes, type change, prosodic emphasis, etc. The effectiven...

This paper introduces BFEMP, a new approach for monolithically coupling the Material Point Method (MPM) with Finite Element (FEM) through barrier energy-based particle–mesh frictional contact using variational time-stepping formulation. The fully implicit time integration of coupled system is recast into barrier-augmented unconstrained nonlinear optimization problem. A modified line-search Newt...