大学英语形成性评估效度实证研究

课堂形成性评估指教学过程中通过及时、有效的反馈促进语言教学健康发展的评估手段。课堂形成性评估能否作为终结性标准化测试的有效补充,在很大程度上取决于评估的效度。大学英语课堂形成性评估内容效度、结构效度和互存效度的分析表明：课堂形成性评估能提供更全面、更有意义的信息来描述学生的学习行为、能力发展和成绩进步,促进教学目标的实现。     

均匀电介质内球形空腔中的电场

运用静电学基本原理,分析了一道典型静电学习题的解答错误,通过讨论给出了正确结果。     

美国一流大学心理健康教育工作的特色分析

美国一流大学的心理健康教育工作具有十分鲜明的特色,主要表现为:心理健康的实质内涵重在健康而非仅指心理;工作形式上注重实效而不断探索有效方式,通过组织研讨活动、学生自我保健教育以及提供健康图书资料等形式深入浅出地对学生进行教育和服务;工作内容上通过专业化道路来提高服务的精深度,日益显现出工作机构专门化、工作人员专业化以及工作趋向医疗化的特点.这些方面充分表明美国一流大学心理健康教育工作的有效性,值得借鉴和学习.     

The quest for fairness in language testing

The search for fairness in language testing is distinct from other areas of educational measurement as the object of measurement, that is, language, is part of the identity of the test takers. So, a host of issues enter the scene when one starts to reflect on how to assess people's language abilities. As the quest for fairness in language testing is still in its infancy, even the need for such a research has been controversial, with some (e.g., Davies, 2010) arguing that such research is entirely in vain. This paper will provide an overview of some of the issues involved. Special attention will be given to critical language testing (CLT) as it has had a large impact on language testing research. It will be argued that although CLT has been very effective in revealing the ideological and value implications of the constructs of focus in language testing, extremism in this direction is not justified.     

Benchmarking the performance of Bhutanese students with the performance of the students from the OECD's PISA countries

Setting international benchmarks for education systems of the Organisation for Economic Co-operation and Development (OECD) countries is one of the goals of the OECD's Programme for International Student Assessment (PISA). However, some countries are not able to participate in PISA, despite their desire to set international benchmarks for their education systems. This article presents a method of setting international benchmarks for a country's school education system, without necessarily participating in PISA, by designing a test using the test items released by PISA for public consumption. The method has been implemented in a study that involved 1,500 Grade 10 students across 60 schools in Bhutan. The students were administered a mathematics test constructed from the PISA Mathematical Literacy test items. The study showed that the performance of Bhutanese students was comparable with the performance of the students from the countries that participated in PISA 2003 and that Bhutan could learn from both high- and low-performing school education systems of those countries.     

The reliability and validity of the pupil behaviour questionnaire: a child classroom behaviour assessment tool

ABSTRACT

This paper assesses the reliability and validity of the teacher-completed Pupil Behaviour Questionnaire (PBQ), by comparing it to the already extensively validated teacher-completed Strengths and Difficulties Questionnaire (SDQ). Participants included 2074 primary school children participating in a universal school-based trial and 41 vulnerable children who were taking part in a study exploring the impact of exclusion from school. Exploratory factor analysis results (first factor accounts for 80.8% of the variation in the items) and the high Cronbach’s alpha value of 0.85 indicate that the PBQ consists of one substantive factor/dimension. Strong correlations between the total PBQ score and the conduct sub-scale (Spearman’s correlation coefficient (r_s) = 0.67) and total difficulties score (r_s = 0.59) of the SDQ indicate convergent validity. This study suggests that the PBQ is a reliable measure, and provides some evidence of validity. Further work is needed to test the PBQ in an older, more diverse populations and to measure sensitivity to change.     

关于数学分析中Dini定理教学的思考

Dini定理是判定函数列及函数项级数一致收敛的一个重要性质,因此,分析其条件的适用范围及将此定理加以推广和应用,有助于学生更好地掌握函数列及函数项级数一致收敛的判定。     

磁场中旋转圆柱导体内电场及电荷分布

金属圆柱导体在匀强磁场中分别绕对称轴和垂直于对称轴的轴转动时,推导出电场和电荷密度的表达式,研究表明电荷密度与角速度有关与旋转半径无关,电场的大小正比于旋转半径.     

累次极限可交换的一个充分条件

研究二重极限与累次极限,一致收敛与累次极限的关系,把一致收敛的概念推广到弱一致收敛。进而给出累次极限可交换的一个充分条件。     

均匀收敛PNLMS自适应算法性能分析与应用

按照均匀收敛的总体要求,通过分析不同权值抽头的均方偏差收敛过程,得到一种均匀收敛比例归一化最小均方算法．对PNLMS算法比例系数进行改进得到另一种均匀收敛算法．仿真结果表明：所提算法保持了PNLMS类算法初始收敛速度快的特点,在整个过程中获得了均匀的速度,稳态误差与NLMS算法基本相同．