计算机辅助设计的现状与发展

本文介绍了计算机辅助设计的发展历史、应用现状和特点,探讨CAD的发展趋势和在应用中应注意 的技术问题。     

继续教育教学模式与教师角色转换

面向未来的继续教育应该具有终身教育的性质，教育已不仅仅是在规定的时间内吸收固定的内容，而被视为一种人类的进程。面向未来的继续教育的基本模式是“实践——反思”式，因此，从事继续教育的高校教师应尽快实现自己角色的转变。     

高等教育大众化与就业问题思考

中国高等教育已进入大众化阶段。随着高等教育规模的扩大 ,高校毕业生就业问题愈来愈引起各界的关注。因此 ,我们从影响毕业生就业问题的因素出发 ,分析高等教育规模扩大之后导致毕业生就业情况发生的变化 ,进而为解决高校毕业生就业问题提出一些建议和措施。     

氧化还原反应专题复习

氧化还原反应知识点多,知识面广,概念性强．它贯穿于整个中学化学教学的全过程,是中学化学知识的重点,也是学生学习的难点,更是历年高考命题的热点．因此,做好氧化还原反应有关知识的复习显得尤为重要．笔者认为氧化还原反应复习应做好如下几点：     

谈语文中的"模糊性"艺术

在现实生活中 ,按照日常习惯 ,语言表达应该清楚明晰 ,否则 ,人与人的交际就会出现障碍。可是在被称为“语言艺术”的文学世界里 ,“模糊”语言却具有特别迷人的风光。值得注意的是 ,这里所说的“模糊” ,不是模棱两可 ,含混不清 ,而是指在不影响读者准确理解课文内容 ,掌握教学重点 ,以及达到一定的教学目的的前提下 ,以模糊、不确定的表达来激发、诱导读者的联想和想象 ,让学生充分发挥自己的主观能动性 ,从而进行再创造的过程中提高自己的欣赏能力 ,并获得一定的审美享受。所谓模糊性理解 ,是指读者在阅读时产生的多样性、灵活性和随机性…     

3D simulation of storm surge disaster based on scenario analysis

The occurrence of storm surge disaster is often accompanied with floodplain, overflow, dike breach and other complex phenomena, while current studies on storm surge flooding are more concentrated on the 1D/2D numerical simulation of single disaster scenario(floodplain, overflow or dike breach), ignoring the composite effects of various phenomena. Therefore, considering the uncertainty in the disaster process of storm surge, scenario analysis was firstly proposed to identify the composite disaster scenario including multiple phenomena by analyzing key driving forces, building scenario matrix and deducing situation logic. Secondly, by combining the advantages of k-ω and k-ε models in the wall treatment, a shear stress transmission k-ω model coupled with VOF was proposed to simulate the 3D flood routing for storm surge disaster. Thirdly, risk degree was introduced to make the risk analysis of storm surge disaster. Finally, based on the scenario analysis, four scenarios with different storm surge intensity(100-year and 200-year frequency) were identified in Tianjin Binhai New Area. Then, 3D numerical simulation and risk map were made for the case.     

关于我国新闻舆论监督对策的思考

我国的新闻舆论监督虽然取得长足发展，但是目前由于受法律不健全，记者的知情权、监督权缺乏实际保障．地方保护主义严重等因素制约，影响这项工作的开展。为此，我们采取的对策应是大处着眼，小处着手，多为群众解难题，不为政府出难题，充分发挥新闻舆论监督的社会教育作用。     

关于平行平均曲率向量的子流形(英文)

研究了空间形中具有平行平均曲率向量的子流形上共形度量的数量曲率的上界和超曲面的稳定性.     

Polymerization of methyl methacrylate with ethylene bridged heterodinuclear metallocene of samarium and titanium-study on synergism and kinetics

Comparison of MMA polymerization results with samarocene chloride, titanocene chloride and the title heterodinuclear (Sm−Ti) catalyst, respectively, showed synergism in the Sm-Ligand-Ti system, which obviously influenced the polymerization behaviors, for example, of yeilding higher activity and higher molecular weight polymer. Kinetic studies on polymerization of MMA with ethylene bridged samarocene and titanocene chloride/Al(i-Bu)₃ showed that the polymerization rate was first-order on the catalyst concentration, and 1.9-order on the monomer. The overall activation energy measured was 52.8 kJ/mol. Project supported by NSFC (No. 20074028), and SINOPEC(X598037).     

I2C总线控制彩电故障诊断的基本思路

因I^2C总线控制彩电技术较新、难，对大多数维修人员来说当它出现故障时很难准确判断。就此，文章在介绍I^2C总线控制彩电的特点与辨别方法的基础上，从“软”、“硬”两方面讨论了I^2C总线控制彩电故障判断基本思路。