The relevance-adaptation theory can be said to be a combination of relevance theory and adaptation theory.It is a kind of cognition of context.Generally speaking,cognition context is a kind of mental cognition,which b...The relevance-adaptation theory can be said to be a combination of relevance theory and adaptation theory.It is a kind of cognition of context.Generally speaking,cognition context is a kind of mental cognition,which belongs to a form of mental structure recognition,relating to the knowledge,understanding and relevance of discourse information in this context.This article mainly elaborates the operation mechanism of relevance and adaptation theory and the comparison of relevance of College English Test Band 4 and 6.This can be used as a reference for relevant academic staff.展开更多
The dynamic fracture behaviors of Ti-6Al-4V alloy at high strain rate loading were investigated systemically through Taylor impact test, over the range of impact velocities from 145 m/s to 306 m/s. The critical impact...The dynamic fracture behaviors of Ti-6Al-4V alloy at high strain rate loading were investigated systemically through Taylor impact test, over the range of impact velocities from 145 m/s to 306 m/s. The critical impact velocity of fracture ranges from 217 m/s to 236 m/s. Smooth surfaces and ductile dimple areas were observed on the fracture surfaces. As the impact velocity reached 260 m/s, the serious melting regions were also observed on the fracture surfaces. Self-organization of cracks emerges when the impact velocity reaches 260 m/s, while some special cracks whose ＂tips＂ are not sharp but arc and smooth, and without any evidence of deformation or adiabatic shear band were also observed on the impact end surfaces. Examination of the sections of these special cracks reveals that the cracks expand along the two maximum shear stress directions respectively, and finally intersect as a tridimensional ＂stagger ridge＂ structure.展开更多
As one of the world well-known high-stakes tests, CET-4 （College English Test Band 4） changed from being generally accepted to being widely questioned in the past 25 years. In spite of a series of reforms of CET-4, ...As one of the world well-known high-stakes tests, CET-4 （College English Test Band 4） changed from being generally accepted to being widely questioned in the past 25 years. In spite of a series of reforms of CET-4, the negative impact of CET-4 remains intense. Three main reasons are probed into here. Firstly, the objective of CET-4 is ambiguous. Secondly, the test objective does not accord with teaching objective. Finally, test contents do not match well with the practical language use. To improve the present passive state of CET-4, some suggestions are given.展开更多
The paper introduces relevance theory and explores the application of relevance theory to CET-4 listening comprehension teaching, especially the teaching of CET-4 listening comprehension in the first section whose tes...The paper introduces relevance theory and explores the application of relevance theory to CET-4 listening comprehension teaching, especially the teaching of CET-4 listening comprehension in the first section whose test format is multiple choice question, simplified as MCQ.展开更多
本文探讨了全国商务英语专业英语四级考试能力量表的设计,以2013年的笔试数据为依据,对考试的信度和效度进行分析,并运用多面R A S C H模型,测量了试卷各题目的难度,以检验该考试的区分度和权威性。统计结果显示,该考试具有良好的信度...本文探讨了全国商务英语专业英语四级考试能力量表的设计,以2013年的笔试数据为依据,对考试的信度和效度进行分析,并运用多面R A S C H模型,测量了试卷各题目的难度,以检验该考试的区分度和权威性。统计结果显示,该考试具有良好的信度和效度,试题能够合理区分考生,符合测试学的要求,适用于大规模考试。本文对测试题的改进和今后如何完善该考试提出了建议。展开更多
文摘The relevance-adaptation theory can be said to be a combination of relevance theory and adaptation theory.It is a kind of cognition of context.Generally speaking,cognition context is a kind of mental cognition,which belongs to a form of mental structure recognition,relating to the knowledge,understanding and relevance of discourse information in this context.This article mainly elaborates the operation mechanism of relevance and adaptation theory and the comparison of relevance of College English Test Band 4 and 6.This can be used as a reference for relevant academic staff.
基金Project (51001014) supported by the Young Scientists Fund of the National Natural Science Foundation of China
文摘The dynamic fracture behaviors of Ti-6Al-4V alloy at high strain rate loading were investigated systemically through Taylor impact test, over the range of impact velocities from 145 m/s to 306 m/s. The critical impact velocity of fracture ranges from 217 m/s to 236 m/s. Smooth surfaces and ductile dimple areas were observed on the fracture surfaces. As the impact velocity reached 260 m/s, the serious melting regions were also observed on the fracture surfaces. Self-organization of cracks emerges when the impact velocity reaches 260 m/s, while some special cracks whose ＂tips＂ are not sharp but arc and smooth, and without any evidence of deformation or adiabatic shear band were also observed on the impact end surfaces. Examination of the sections of these special cracks reveals that the cracks expand along the two maximum shear stress directions respectively, and finally intersect as a tridimensional ＂stagger ridge＂ structure.
文摘As one of the world well-known high-stakes tests, CET-4 （College English Test Band 4） changed from being generally accepted to being widely questioned in the past 25 years. In spite of a series of reforms of CET-4, the negative impact of CET-4 remains intense. Three main reasons are probed into here. Firstly, the objective of CET-4 is ambiguous. Secondly, the test objective does not accord with teaching objective. Finally, test contents do not match well with the practical language use. To improve the present passive state of CET-4, some suggestions are given.
文摘The paper introduces relevance theory and explores the application of relevance theory to CET-4 listening comprehension teaching, especially the teaching of CET-4 listening comprehension in the first section whose test format is multiple choice question, simplified as MCQ.
文摘本文探讨了全国商务英语专业英语四级考试能力量表的设计,以2013年的笔试数据为依据,对考试的信度和效度进行分析,并运用多面R A S C H模型,测量了试卷各题目的难度,以检验该考试的区分度和权威性。统计结果显示,该考试具有良好的信度和效度,试题能够合理区分考生,符合测试学的要求,适用于大规模考试。本文对测试题的改进和今后如何完善该考试提出了建议。
