混合选举制评析

混合选举制是二战后由德国首创的一种新型选举制度。它把世界原有两大选举模式即多数制代表制与比例代表制相结合,不同程度地克服了其各自的弱点。20 世纪 90 年代以来,世界许多国家依据其各自的政治需要,对德国式的混合选举制作了不同程度的修正,从而使之各具特色,形式多样,并由此成为21 世纪世界选举制改革的一种趋势。本文着重分析混合选举制产生的历史背景、原理、特征及其带来的政治效果。     

从传统中药集散地生成现代中药产业集群

传统中药集散地是准中药产业集群,要成为现代中药产业集群还需要组分的充实和结构的优化。在比较传统中药集散地和现代中药产业集群结构、功能基础上,探讨传统中药集散地向现代中药产业集群演变的途径和策略。     

我国历届奥运奖牌获得项目分布的比率特征与奖牌优势性项目发展对策研究

采用文献资料等方法 ,对 1984年至 2 0 0 0年我国参加 5届奥运会获得奖牌的情况进行了比率统计分析。结果表明 :我国获得奖牌具有较大优势性项目的男、女分获比率序位不同 ,女子的优势明显大于男子 ,我国女子在奥运新增项目和相对冷门项目上具有很强的奖牌竞争实力 ,女子大球运动也是我国在奥运会中极具奖牌竞争实力的项目 ,男子非我国传统奥运项目的奖牌竞争实力急待提高等     

Schema-based instruction: Effects of experienced and novice teacher implementers on seventh grade students' proportional problem solving

This study examined the effects of a research-based intervention, schema-based instruction (SBI), implemented by experienced- (taught SBI in previous study; Jitendra et al., 2015) and novice-teacher implementers (taught SBI for the first time with professional development) on the mathematics outcomes of seventh-grade students. SBI is a multicomponent intervention that emphasizes the mathematical structure of problems through the use of schematic diagrams and incorporates problem solving and metacognitive strategy instruction. Results indicated that both experienced- and novice-teacher implementers delivered SBI with similar levels of fidelity; there was no SBI experience effect on the immediate and 10-week retention tests of proportional problem-solving, on a general measure of problem solving, or on the end of the year state mathematics achievement test. These results provide evidence that the effectiveness of SBI generalizes over time to different cohorts of teachers and that the impact of SBI on student mathematics outcomes is maintained over time without additional PD.     

建筑电气节能设计之探讨

建筑配电系统要选择合适的供电电压,合理设计供配电线路,以减少电能在线路传输上的损耗;建筑照明应合理选取照度水平、电光源、高效照明器具及节能附件并重视照明控制设计;在节能型电器的选用上要合理选用变频器及具有节电效果的低压电器.     

混合理想气体平均相对速率的求解

利用雅可比行列式变换,推导了混合气体的相对速度所遵循的分布函数,对气体分子的平均相对速率和平均速率关系进行了求解和证明.     

熵理论在比例再保险中的应用

文章在研究均值-方差原理下的最优再保险模型的基础上,分析了该模型用方差度量风险的缺陷,进而提出用熵作为风险的一种度量方法,改进了Markowitz的均值-方差模型,建立了均值-方差-熵优化模型. 并通过实证说明了新模型在确定最优自留额时具有很好的可操作性和实用价值.     

中国哲学社会科学学术期刊基本数据分析(下)

(续上期) 4.5 期刊责任者分布结构 按主办单位第一责任者计,我国哲学社会科学学术期刊的主办机构最多的是高校系统,约占总体的40.32%;其次是科研系统,占总体的15.05%(科研系统是指各级社科研究院所及专门的研究机构,如国务院研究发展中心等,但各级政府的政策研究室等不包括在内),见表5.     

Matlab在验证PN结伏安特性实验中的应用

介绍了验证PN结伏安特性实验的实验原理，对实验测得的数据进行处理，给出了每一步处理的数据和最后结果数据、曲线，提供源代码。     

Principled Improvement in Science: Forces and proportional relations in early secondary-school teaching

In response to continuing concerns about student attainment and participation in science and mathematics, the epiSTEMe project took a novel approach to pedagogy in these two disciplines. Using principles identified as effective in the research literature (and combining these in a fashion not previously attempted), the project developed topic modules for early secondary-school teaching in the UK, arranged for their implementation in classrooms, and evaluated the results. This paper reports the development, implementation, and evaluation of one of the epiSTEMe science modules. Entitled Forces and Proportional Relations, the module covers standard curricular material in the domain of forces, while paying particular attention to the proportional nature of many key constructs. It was developed in collaboration with a small group of teachers; implemented subsequently in 16 classrooms, in all cases involving students from the first year of secondary school; and evaluated through comparison with first-year students in 13 control classrooms who were studying the topic using established methods. Evaluation addressed topic mastery and opinions about the topic and the manner in which it was taught. While further research is required before definite conclusions are warranted, results relating to topic mastery provide grounds for optimism about the epiSTEMe approach. Furthermore, student opinions about the module were positive.