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  • Author: Hu Jun x
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Abstract

We prove a Morita reduction theorem for the cyclotomic Hecke algebras ℋr, p, n(q, Q) of type G(r, p, n) with p > 1 and n ≧ 3. As a consequence, we show that computing the decomposition numbers of ℋr, p, n(Q) reduces to computing the p′-splittable decomposition numbers (see Definition 1.1) of the cyclotomic Hecke algebras ℋr′, p′, n′(Q′), where 1 ≦ r′ ≦ r, 1 ≦ n′ ≦ n, p′ | p and where the parameters Q′ are contained in a single (ɛ′, q)-orbit and ɛ′ is a primitive p′th root of unity.

Abstract

This paper reviews important second language research on recasts in response to a recent debate between Goo and Mackey (2013) and Lyster and Ranta (2013) in the journal Studies in Second Language Acquisition. It begins by clarifying the definition of recasts and then examines several controversial issues featuring prominently in the debate, including the theoretical underpinnings of existing research on recasts, mixed findings about their effectiveness in language acquisition, and methodological concerns in effectiveness research. The primary aim of this paper is to demarcate common ground and disagreement that are emerging in this debate and, based on a synthesis and critique of previous empirical studies, to identify directions for future research. It also explores pedagogical implications of recasts research for English-as-a-foreign-language contexts.

Abstract

In this paper, the preparation and the test of the endothermic properties of modified expanded graphitebased CaxZny(OH)2(x+y) composite materials are reported, which is promised to be used for heat storage. Coprecipitation method is employed to prepare the modified expanded graphite-based CaxZny(OH)2(x+y) composite materials for heat storage. Ca(OH)2 is dissolved in water first, and a certain amount of ZnO is added into the Ca(OH)2 solution to get a milky suspension; thereafter the modified expanded graphite is immersed into the milky suspension to prepare the composite materials by way of physical adsorption. Furthermore, differential scanning calorimetric analyzer is used to analyze the endothermic properties of the material. The results show that the endothermic enthalpy of the composite material is about 1000 J/g with lower decomposition temperature.

Abstract

To independently control the depth and trim of the submarine, a fuzzy control method on stern-rudder is proposed, and the advantage of a single stern-rudder in low noise control is elaborated. Taking into account the character of the single stern-rudder, a fuzzy controller is designed. The simulation results have shown that the algorithm has very good control precision, which decreases the rudder and radiated noise greatly.