一水邻苯二甲酸钙的热分解及其脱水动力学分析

采用TG-DTA分析研究了一水邻苯二甲酸钙热分解过程,对其中的脱水过程进行了动力学计算. 由Friedman和Ozawa-Flynn-Friedman法得到脱水过程的活化能和指前因子,用Archar方法计算拟合了几种机理函数,确定了脱水过程的优化动力学参数及最佳机理模型. 脱水过程的活化能Ea为141.1576 kJ/mol,反应的机理模型为Bna,即f(α) =(1-α)n*αn.     

小学生自我概念训练的实验研究

通过Piers-Harris儿童自我概念量表筛选出三至五年级低自我概念的学生,实验组接受认知训练,控制组不接受训练。认知训练以后,三个年级的实验组的自我概念水平提高的幅度均比控制组的幅度要大,经统计检验,差异都非常显著。这表明:(1)认知训练可提高学生的自我概念水平;(2)小学三到五年级自我概念水平的训练效果不存在年龄差异;(3)小学三到五年级自我概念的训练效果不存在性别差异。     

Validation of a self-perceived media competence instrument for pre-service teachers / Validación de un instrumento de autopercepción de competencia mediática para docentes en formación

Abstract

Key to guaranteeing the fundamental human rights of freedom of expression and information is the development of media competence, particularly in schools. Training teachers in the area of media competence is particularly important for developing these skills in the broader citizenry. In order to provide educators and educational policymakers with a useful diagnostic tool, we have designed a self-perception questionnaire. The questionnaire was applied to a sample of Peruvian education students (N = 501). On the one hand, the results confirm the construct’s coherence, validity and instrumental reliability. On the other hand, they allow us to propose a theoretically based update to the way in which this construct is interpreted and applied, confirming the multidimensionality of media competence. Finally, we use this empirical evidence to discuss the integral, transversal and ecological status of media competence.     

三类四阶非线性微分方程的可解条件

借助变量替换法、交换变量位置法与求导法则，给出三类四阶非线性微分方程具有某种形式的解的充要条件，所得结论是对有关文献结果的深化与拓广。     

高职文秘专业考试制度初探

进行以"实践能力测试"为核心的考试制度改革就是要摒弃以往传统的考试制度,侧重对学生的实践能力考察,并引导学生重视知识运用能力、分析和解决问题能力、自我评价和评价他人能力及心理素质、协作精神、职业道德等。这种理念主要是培养出适应现代需要的,具有更强实践能力、创新能力和创业精神的现代化文秘人才。     

设计性物理实验教学模式研究与探索

分析教学模式的实质和特点,针对传统物理实验教学模式存在的问题,结合设计性物理实验特点,研究适合设计性物理实验的教学模式,并在教学实践中进行探索和实践,以提高学生的实验能力和综合素质。     

试论现代篮球运动的防守战术

对现代篮球运动防守战术发展的特点进行了分析；强调防守战术的形成离不开防守技术的配合，并就如何完善防守的战术、技术分别向教练员、运动员提出了若干建议。     

Trainee teachers' conceptions of teaching and learning,classroom layout and exam design

The objective of this study centres on identifying and classifying the conceptions of teaching and learning held by future secondary school teachers, and on analysing the relationship between these conceptions and the way classroom space is organized and exams are designed. The test instruments used were applied to a sample of 138 graduates, who were all following the Pedagogical Aptitude Course (CAP) during the academic year 2002/03. Results show that the more traditional teaching/learning models are related to a more vertical classroom layout. Significant correlations between beliefs and exam demands were also found.     

谈哈金并致海外中国作家

哈金的英文小说获得美国文学界高度评价。他不用美国价值简单地批评中国,也不像某些华人作家那样为了迎合国外市场而任意杜撰,他的“中国人的故事”写得简洁、清晰而诚实。这是哈金的积极意义所在。但他也未能向读者提供观察中国的新视角,其作品大多数缺乏深度和回味。这主要是因为哈金属于“第一代华人新移民作家”群体,该群体既有国内同龄作家的思想局限,又有因为生活在海外而导致的精神隔膜。和现代作家以及新时期作家相比,他们普遍找不到恰当的精神基点,创作上呈现出巨大的盲目性与不确定感。     

Social Constructivism and Asynchronous Text-Based Discussion: A Case Study with Trainee Teachers

The paper reports a case study using asynchronous text-based discussion. It considers the role of the tutor and discusses the extent to which online discussions can facilitate social constructivist approaches to instruction and the creation of knowledge. Participants were 17 trainee teachers studying on a post graduate teaching course. The asynchronous text-based discussion (using e-blackboard) focused on planning for progression in children's learning in history and culminated in the trainee teachers writing individual assignments on the topic. The paper analyses the different types of contributions made and reports on the trainees' evaluations of the benefits and limitations of using e-blackboard. It concludes with recommendations and areas for further research.