基于魔灯(Moodle)的研究性学习模式初探

本文探讨了利用魔灯学习管理系统进行研究性学习的特点,并就以魔灯为中介的师生、生生之间的互助合作,提出了一种基于魔灯的研究性学习模式。     

The effect of language specific factors on early written composition: the role of spelling,oral language and text generation skills in a shallow orthography

Spelling skills have been identified as one of the major barriers to written text production in young English writers. By contrast oral language skills and text generation have been found to be less influential in the texts produced by beginning writers. To date, our understanding of the role of spelling skills in transparent orthographies is limited. The current study addressed this gap by examining the contribution of spelling, oral language and text generation skills in written text production in Italian beginner writers. Eighty-three children aged 7–8 years participated in the study. Spelling, lexical retrieval, receptive grammar, and written sentence generation and reformulation skills were assessed and children were asked to write a text on a set topic. A factor analysis revealed that the children’s written text production was captured by three factors: productivity, complexity and accuracy. In contrast to results from children learning to write in opaque orthographies, such as English, this study showed that receptive grammar and written sentence generation skills accounted for significant variance in measures of productivity, complexity and accuracy in Italian children’s written text production. Spelling skills contributed to text accuracy and quality and explained more variance than receptive grammar in microstructural accuracy. By contrast, oral grammatical skills explained more variance in text quality than spelling. The current study shows the differential impact of language systems, such as Italian, on written text production. Implications for assessment and instruction are outlined.     

声音在空气中的传播

原人教版初中物理教材“声音在空气中的传播”一节，安排了这样的演示实验：用两个相同的音又，左边音叉旁挂一个塑料小球，敲击右边的音叉，发现塑料小球弹开。说明右边音叉的振动通过空气传给了左边的音叉。这个实验能说明声音可以在空气中传播，但事实上这个实验很难成功，因为它对音叉的频率要求很严格。现行教材将此实验删除，却没有新实验来替代。笔结合自身教学实践，设计了一个替代实验，供大家参考![第一段]     

镓(Ⅲ)—溴邻苯三酚红—邻菲啰啉三元配合物的研究

本文拟定了一种微量镓(Ⅲ)的测定方法:当有聚乙烯醇存在时,在PH3.6的醋酸—醋酸钠缓冲溶液中,镓(Ⅲ)能与溴邻苯三酚红及邻菲啰啉形成兰紫色三元配合物,λ_(max)=615nm,镓(Ⅲ)的量在0.095～35μg/25ml范围内符合比尔定律。其表观摩尔吸光系数ε_(615)=3.69×10~4,此法用于铝合金中微量镓(Ⅲ)的测定,相对偏差小于3％,结果准确度高。     

优化地理课堂教学 实施素质教育

改变过去老的课堂教学模式,充分发挥学生的主体作用,激发学生学习地理的兴趣,把机械记忆转变为灵活有趣的多形式记忆,从而丰富学生的地理知识和提高各方面的综合素质。     

关于网络教育的若干哲学思考

网络教育是近年来最重要的教育模式创新,它从多方面深刻地改变了传统教育.本文运用马克思主义哲学理论,从教与学的辩证关系、教育的实践方式、教育的公平性和教育的功能等方面研究了网络教育对传统教育的观念、方法和内容的影响,对正确认识网络教育的特点、处理网络教育与传统教育的关系等理念作出了相关思考.     

一种用于大规模动态异构信息集成的多代理结构

为了在集成大量异构自治信息资源时实现高效率互操作性,设计了一种基于智能体(agent)的多代理结构.用一组代理智能体以peer-to-peer(P2P)方式为其他非代理智能体提供代理服务,从而提高系统的可扩展性与健壮性.代理服务使用本体技术来实现系统互操作性.与其他多代理结构不同的是,除了领域内本体,还引入了一个领域间本体来表达各个领域内本体中公共概念的联系.因此,代理可以根据领域间本体的信息,将查询请求仅发往相关的代理,减少了网络通信量,更好地发挥多代理体系结构的优势.实验结果表明,系统实现互操作性的效率相对于现有的系统有明显的提高.