The interplay of representations and patterns of classroom discourse in science teaching sequences

The purpose of this study is to examines the relationship between the communicative approach of classroom talk and the modes of representations used by science teachers. Based on video data from two physics classrooms in Singapore, a recurring pattern in the relationship was observed as the teaching sequence of a lesson unfolded. It was found that as the mode of representation shifted from enactive (action based) to iconic (image based) to symbolic (language based), there was a concurrent and coordinated shift in the classroom communicative approach from interactive–dialogic to interactive–authoritative to non-interactive–authoritative. Specifically, the shift from enactive to iconic to symbolic representations occurred mainly within the interactive–dialogic approach while the shift towards the interactive–authoritative and non-interactive–authoritative approaches occurred when symbolic modes of representation were used. This concurrent and coordinated shift has implications on how we conceive the use of representations in conjunction with the co-occurring classroom discourse, both theoretically and pedagogically.     

近二十年来中国政治文化变迁与分析

近二十年中，随着中国社会的转型与变迁，特别是市场经济为基本导向的经济改革的不断深入，中国政治文化的变迁呈现出从依附走向独立，从单维转向多维，从封闭转向开放，从情绪化走向法理化等一系列特征。一体多元化的政治文化格局的客观进程正在悄悄地进行－尽管这一进程刚刚起步。     

Thermodynamic Analysis and Comparison on Low Temperature CO_2-NH_3 Cascade Refrigeration Cycle

Intheapplicationsofindustrialandcommercialrefrig erationsystem ,iftherequiredrefrigerationtemperatureisverylow ,theconventionalvaporcompressionsystemisdiffi culttomeettherequirementbecausewhenthedifferencebe tweentheevaporatingtemperatureandthecondensingtemper atureissohighthatitishardtofindarefrigeranttomeettheneedsasthecondensingpressureisnottoohighandtheevap oratingpressureisnottoolow .Whentherefrigeratingtemper atureisverylow ,thecascaderefrigerationcycleissuitabletobeused .Itcannotonlysat…     

高校学生有意欠费的心理分析及对策研究——兼论大学生诚信教育

随着社会经济成份、组织形式、利益关系等日益多样化,人们的思想观念、思维方式和价值取向也日益呈现出多元的发展趋向,尤其是受社会不良风气的影响,大学校园里也充斥着许多虚伪丑陋的现象,大学生有意欠费之风便是其中之一。本文从大学生有意欠费的心理因素入手进行分析,研究少数大学生有意欠费现象,并就大学生的诚信教育问题谈一些初浅的看法。     

面向对象方法

综述面向对象方法(Object-Oriented Methodology简称OO方法)的由来和发展，以及当前的主要研究领域；OO方法的基本概念、主要特征，并从OO方法作为新的方法学、程序设计新范型和一门新技术的角度展开了论述．     

从翻译失误看语篇翻译中的深层逻辑语义分析

逻辑语义关系是指由某种表层逻辑结构显现，并通过语言表达而附加出来的意义关系。原文表层逻辑结构和深层逻辑语义的不一致是造成翻译中逻辑转换失误的重要原因。因此，译者在翻译时应仔细分析原文内在的逻辑语义关系，再用符合译入语习惯的逻辑形式表达出来。     

浅释英语隐喻的语用分析

隐喻不仅是一种复杂的语言形象，还是一种思维形式。构建隐喻理论的任务，就是力求阐述将句子的字面意义和说话人的隐喻意义联系在一起的原则。完整的隐喻理论体系，应当是语言学、语义学、语用学、哲学、认知心理学以及符号学等学科对隐喻研究的综合。     

空间高精度定位姿柔顺工作平台输入输出模型的研究

A precise micro-location compliant stage with elastics-supported system is enmployed for investigations.The general motion of stage supported by elastic structure is described.The analyses of forward displecement and inverse displacement of stage are formulated.The study of input-output behavior of compliant mechanisms actually belongs to a stress-strain field problem.By using finite element analysis.the compliance coefficients of the stage supported by ring are calculated.Finally,a case is inverstigated to exemplity these formulae.     

几何刚度矩阵的推导和应用

以虚功原理为基础有限元进行梁柱的分析，应用很少，主要是于在计算中，荷载很小时，计算结果就不收敛了。因而也就很难应用于工程分析中。以虚功原理为基础推导得出了几何刚度矩阵，分析了计算不收敛的原因，得出结论：不考虑节点力因位移产生的不平衡力对几何刚度矩阵的影响，是计算结果不收敛的主要原因。算例说明了当考虑了这个影响以后，计算结果和文献给出的计算结果符合良好。     

模糊限制语的合作原则分析

合作原则,作为一个重要的会话原则,在言语交际中被交际双方广泛地遵守着。但是,有时出于具体的交际需要和交际目的,也有很多违反合作原则的情况出现。本文运用合作原则对一个重要的语言现象——模糊限制语进行了语用分析。从合作原则的四个准则方面对模糊限制语进行了具体的分析,指出,为了达到交际目的,交际双方不得不使用一些模糊限制语,这看似违反了合作原则,其实是对合作原则的竭力遵守。