现有大学文科数学教材中存在不足的思考

教材的质量和水平很大程度上决定着教学的质量与水平.面对不同学生群体的教材应该具有针对性.现有大学文科数学教材普遍存在针对性不足的问题,对此,进行以下几个方面的思考:对于定义,删繁就简突出重点;对于例题,旁征博引提高兴趣;对于思想,融会贯通启发体会。     

Cracking behaviors and crack control of self-consolidating concrete: a review of literature

Cracking in concrete occurs from volumetric instability, mechanical loading, and/or environmental attack. Compared to conventional vibrated concrete, self-consolidating concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. To obtain a better understanding of self-consolidating concrete cracking behaviors for designing and constructing crack-controlled structural elements, reported current research and practices are reviewed and analyzed in this paper. It has been believed that when well designed and well constructed, high quality self-consolidating concrete can be successfully used in various structures with cracks properly controlled.     

高寒地区混凝土面板堆石坝趾板混凝土配合比的试验研究

高寒地区混凝土面板堆石坝趾板混凝土对抗冻性有特别高的要求,针对抗冻性F300这一关键性的技术指标对其进行配合比对比试验研究分析,拟合得到28d抗压强度与胶水比的关系式,选择出了既满足性能要求又为经济的配合比。     

高掺量粉煤灰混凝土的力学性能试验研究

介绍了在水泥混凝土中 ,采用粉煤灰替代 30 %水泥的高掺量粉煤灰混凝土的配合比设计 ,以及试件力学性能的室内实验结果。为了控制混凝土各龄期的强度等力学性能 ,在实验研究过程中 ,粉煤灰采用超量替代 ,超量系数为 1.4。     

基于人工智能的混凝土配合比优化设计

采用遗传算法对混凝土进行配合比优化设计,以经济成本为目标函数、以人工神经网络混凝土性能预测模型为约束条件,用实数编码表示个体的染色体位串,通过选择、交叉、变异等遗传算子作用,完成遗传操作,以优胜劣汰为原则,最终达到最优解。将优化结果和工程实例的配合比进行对比,可见该方法可降低造价、节约能源,具有较好的工程使用价值。     

如何运用多媒体辅助物理教学

阐述了利用计算机物理课件能优化物理课堂的教学结构,利用计算机辅助物理实验教学,能培养学生的科学思维方法和创新能力。提出计算机多媒体辅助物理教学可激发学生学习物理的主动性和积极性,提升物理课堂教学容量,加大教学密度,突破教学难点,突出重点,优化物理教学过程,以便取得良好的教学效果。     

鸡西国企改革的探索与实践

实践证明，鸡西市国有企业的改革是有效的，但也出现了一些值得注意的问题。鸡西市政府和国企应积极进行一系列改革的探索，稳步推进国有企业股份制改造，大力发展混合所有制经济，避免国有资产流失。以进一步推进鸡西市国有企业改革。     

从中国与希腊传统体育的比较看中西体育的分殊与融汇

中国与希腊体育无论在其文化内核─—哲学思想，还是其文化内涵“外显”特征─—审美观，都表现出较大的差异：中国传统体育以“天人合一”为其文化内核，以追求养生为目的，突出体现了精神上的人格美审美价值。希腊的传统体育注重“天人之别”，并以其为文化内核。以科学、规范。公平竞争为其表现形式，突出体现了追求人体外形塑造的审美观。然而，也正是这些差异，加之社会的发展等因素，才使中西体育相互之间的借鉴与补充得以成为现实和必然，它们从不同侧面丰富了世界体育的内涵并拓展其外延。     

Mapping the mix: Linking instruments,settings and target groups in the study of policy mixes

This article proposes the extension of a conceptual framework aimed at analysing policy mixes and their outcomes and demonstrates its value added for the study of sustainability transitions. The argument is that policy mixes research should not focus only on the form of policy instruments, but also on their implementation context. Policy mix form designates the specific policy instruments that are involved according to a policy strategy. Policy mix context includes the specific setting where each policy measure is implemented, such as enterprise or family. It also includes the specific target group of each measure, such as youth or smokers. We apply this conceptual framework to the policy concept and implementation of tobacco control policies in Switzerland, which are an exemplary case for analysing transitions as they are geared towards behavioural change. In a mixed method approach, we triangulate different sets of quantitative and qualitative indicators in order to assess the implementation of eleven subnational policy mixes. Our findings show that taking into account the moderating role of settings between policy instruments and target groups allows for a more in depth analysis of policy processes. Observing the interactions between the four elements policy instruments, policy strategy, the implementation settings and the target groups allows capturing the complexity of policy mixes, at the crossroads of policy design, policy implementation and policy outcomes. Taking implementation settings and target groups into account in the analysis of policy mixes allows for a refined understanding of policy compliance and thus, from a broader perspective, of sustainability transitions.     

当今世界健美操混合双人项目难度动作的编排特点研究

运用文献资料调研、观察记录、数理统计等方法,对2004和2006年世界健美操锦标赛混合双人决赛的难度动作进行分析研究。结果表明：当今世界健美操混合双人的成套难度动作总体趋向于“2个A类、2个B类、6个C类、2个D类”的编排结构;世界优秀健美操选手的最高价值难度动作呈前、后半套分布,分布的趋势是编排在第4和第8个;男女运动员通过身体接触同步完成B类高分值难度动作以及采用1—2次组合难度动作也是当今世界健美操混合双人项目难度动作编排的特点。