The impact of a classroom intervention on grade 10 students' argumentation skills,informal reasoning,and conceptual understanding of science

The literature provides confounding information with regard to questions about whether students in high school can engage in meaningful argumentation about socio‐scientific issues and whether this process improves their conceptual understanding of science. The purpose of this research was to explore the impact of classroom‐based argumentation on high school students' argumentation skills, informal reasoning, and conceptual understanding of genetics. The research was conducted as a case study in one school with an embedded quasi‐experimental design with two Grade 10 classes (n = 46) forming the argumentation group and two Grade 10 classes (n = 46) forming the comparison group. The teacher of the argumentation group participated in professional learning and explicitly taught argumentation skills to the students in his classes during one, 50‐minute lesson and involved them in whole‐class argumentation about socio‐scientific issues in a further two lessons. Data were generated through a detailed, written pre‐ and post‐instruction student survey. The findings showed that the argumentation group, but not the comparison group, improved significantly in the complexity and quality of their arguments and gave more explanations showing rational informal reasoning. Both groups improved significantly in their genetics understanding, but the improvement of the argumentation group was significantly better than the comparison group. The importance of the findings are that after only a short intervention of three lessons, improvements in the structure and complexity of students' arguments, the degree of rational informal reasoning, and students' conceptual understanding of science can occur. © 2010 Wiley Periodicals, Inc. J Res Sci Teach 47: 952–977, 2010     

产权保护、融资约束与民营企业研发投入

利用世界银行2005年对我国120个城市6826家民营企业的调查数据,深入考察了民营企业所处地区的产权保护水平和融资约束程度对其研发投入水平的影响.在控制了企业特征、企业家特征、行业等因素后,研究发现：民营企业所处地区产权保护水平的提高和融资约束程度的降低,无论是对于促进我国民营企业参与研发活动,还是提高其研发投入强度,均有显著积极影响.进一步分析表明,上述影响总体上对中小企业更为显著.     

山区“农远工程”有效利用的制约因素分析——赣州市农村中小学远程教育工程的实施调研

农村中小学远程教育工程的有效利用及可持续发展涉及到人、设备、技术、资金、教学实践、管理等各方面的因素,是一个复杂的系统推进的过程．本研究通过对赣州市农村中小学远程教育工程利用实践的调查,分析了其有效利用的制约因素,提出了相关的建议与对策．     

丹尼尔·平克的后信息时代观及其教育启示

文章介绍丹尼尔·平克的后信息时代观,分析“Conceptual Age”的概念及其“创感教育”的内涵,讨论在教学中如何培养学生创感素养,将设计感（Design）、故事感（Story）、交响感（Symphony）、共情感（Empathy）、娱乐感（Play）、意义感（Meaning）融入教学中。     

概念隐喻体系下汉译英翻译模式初探

目前,普通高校普遍存在着学生汉译英水平低下的现象,如何改进翻译教学,提高学生的翻译能力是迫切需要解决的问题。笔者尝试利用莱考夫概念隐喻理论建立一种有效的汉译英翻译模式,以求与传统的翻译方法互补。汉英语言中存在着大量的概念隐喻系统,通过判断汉英概念隐喻系统所蕴含的文化意象的一致性、相似性或相悖性,采用相应的翻译方法。这种翻译手段避开了传统的直译和意译、归化和异化翻译观点的争论,促使学生利用概念隐喻认知学习,掌握这种更为实用的翻译方法。     

基于概念时代的成人网络教学策略

与传统注重思辩的教学不同,概念时代的“六感”是一种新型的教育教学理念。概念时代的成人网络教学,是一种注重师生设计、再设计的模式,教学“六感”的加入,使得它有助于成人右脑的发展,提升了成人学习者的学习设计、体验和快乐,能大大增加成人网络教学的活力与效率,营造较为开放、宽松、愉悦的教学氛围。     

宋代《四书》学的多重观念文化理性

宋代是一个兼集贫弱与宽松的社会历史时代。国家内贫外弱之势激发着主流士人群体图强奋发的使命意识;政治宽松及其文治需求激促着儒家学者及其儒学思想发荣繁茂。身当于这样的社会生活环境,朱熹以“章句”与“集注”相适别的诠释文体,合辑并注释《论语》、《孟子》、《大学》、《中庸》而生成了《四书章句集注》。环绕《四书》与《四书章句集注》而开展的经学活动是为宋代《四书》学。宋代《四书》学涵载着：赵宋政权应用儒学的社会文治理性,宋代学者开新儒学传统的学术理性,宋代学者群体奋发作为的使命践履理性。     

论促进学生概念转变的探究式教学

新课改以后,探究式教学受到了广大科学教育者的重视,但实施效果却不尽人意。针对教师在实施探究式教学中存在的问题,研究者纷纷对探究式教学策略展开研究。为促进学生在科学探究的同时理解科学知识、形成科学概念,教师在实施探究式教学中应了解学生的理论基础并给予正确的理论指导、引发认知冲突、关注学生的情意领域、灵活实施科学探究活动、重视同伴间的交流和讨论。     

Optimal approximate merging of a pair of Bézier curves with G2-continuity

We present a novel approach for dealing with optimal approximate merging of two adjacent Bezier eurves with G^2-continuity. Instead of moving the control points, we minimize the distance between the original curves and the merged curve by taking advantage of matrix representation of Bezier curve＇s discrete structure, where the approximation error is measured by L2-norm. We use geometric information about the curves to generate the merged curve, and the approximation error is smaller. We can obtain control points of the merged curve regardless of the degrees of the two original curves. We also discuss the merged curve with point constraints. Numerical examples are provided to demonstrate the effectiveness of our algorithms.     

Optimal approximate merging of a pair of Bézier curves with G2-continuity

We present a novel approach for dealing with optimal approximate merging of two adjacent Bezier curves with G2-continuity. Instead of moving the control points, we minimize the distance between the original curves and the merged curve by taking advantage of matrix representation of Bezier curve's discrete structure, where the approximation error is measured by L2-norm. We use geometric information about the curves to generate the merged curve, and the approximation error is smaller. We can obtain control points of the merged curve regardless of the degrees of the two original curves. We also discuss the merged curve with point constraints. Numerical examples are provided to demonstrate the effectiveness of our algorithms.