科技期刊质量综合评价的主成分分析法及其改进

应用主成分分析进行理工大学、工业综合类科技期刊质量综合评价,根据主成分累计贡献值确定主成分的有效维数和权重,消除由于指标间的相关性带来的偏差和人为确定指标权重引起的缺陷,使评价结果更客观、公正和准确。研究了评价指标数、期刊种类数等对评价结果的影响,从而确定了合理的评价指标,得到了可靠、有效的评价结果。在18个指标中,根据保留具有重要作用变量的原则,最终选定14个有效评价指标,并且对期刊质量都具有正向作用,其中引用刊教、学科扩散指标等5个指标最重要,而影响因子的重要性最低。     

Effects on high school students of teaching a cross-age alcohol prevention program

This study examined the impact on high school students who taught elementary students MADD's Protecting You/Protecting Me (PY/PM), an alcohol use prevention and vehicle safety program. High school students (N = 188) enrolled in a peer helping course completed surveys before and after teaching PY/PM, and a comparison group of peer helper students (N = 141) from matched schools completed surveys at the same times. Results indicated that, relative to the comparison group, those exposed to PY/PM gained knowledge of alcohol's effects, increased their perceptions of the risks of high levels of alcohol use, gained teaching skills, and showed less frequent episodes of binge drinking. No effects were found for attitudes toward future drinking, perceptions of the risk of low levels of alcohol use, alcohol use, or vehicle safety. This cross-age prevention program may be successful in changing high school students' knowledge, attitudes, and behaviors regarding high levels, but not low levels, of alcohol use.     

机械原理课程设计教学探索与实践

介绍了在机械原理课程设计中,通过运动方案的设计与评价,加强对学生创新能力和综合分析问题能力培养的实践与体会．     

大学英语教学与西方文化教育

大学英语教学与西方文化教育的关系,并不是一个新鲜的话题;但是,在大学英语教学过程中忽视西方文化背景教育的现象依然存在。重新认识西方文化的重要性,从教学实际出发,改进英语教学中西方文化教育的方法,是提高大学英语教学质量的一个关键所在。     

梁思成、林徽因与北京城市规划

新中国解放前夕 ,梁思成与林徽因便对共和国的文物保护工作做出了很大贡献。新中国成立后 ,北京城的许多重要建设都倾注了他们的大量心血。他们对北京城的建设规划提出了许多宝贵的意见 ,现在愈来愈被证实是正确的     

知识创新劳动:个人全面自由发展的一种现实可能

传统理论认为,个人的全面自由发展只能存在于“必需和外在规定要做的劳动的彼岸”,只能通过缩短劳动时间、消灭专业分工才能实现。但从知识经济的发展趋势看,社会总劳动及人们的实际劳动时间不可能减少,专业分工也不可能消灭。这意味着,我们善于个人全面发展的理论应当修正。笔者认为,一种集谋生劳动和自由活动,专业分工和全面发展于一身的新型劳动———知识创新劳动将成为人们实现自由全面发展的现实途径。     

从戴复古“不甚读书”的争论看南宋诗风的演变

从戴复古生前开始，对他是否读书的问题就存在两种截然不同的看法并引发争论。其实，争论出现的原因在于南宋诗坛风气的嬗变。“资书以为诗”和“捐书以为诗”这两种不同诗学主张的此消彼长，明显地影响着对戴复古评价的高低，并一直延续到后代。在江西派长期占据诗坛的背景下，社会上崇尚“资书以为诗”的风气。戴复古因从小失学而深感自卑，但他一直努力弥补以往学习的不足。随着江西派的衰落，崇尚晚唐诗风的永嘉四灵兴起，开始提倡“捐书以为诗”，此时戴复古所擅长的白描手法受到了社会的认可，读书多寡也不再被视为问题。但晚年的戴复古已经认识到江西派和晚唐派各自的利弊得失，从而提出上追大雅、宗法杜甫的主张。这正是他饱读诗书，转益多师，对前辈诗人反复比鉴后所取得的进步。因此，从戴复古一生的创作实践和诗学造诣看，他确实是腹有诗书的。     

ROBUSTNESS OF VARIOUS PRODUCTION CONTROL POLICIES IN SEMICONDUCTOR MANUFACTURING

This paper compares several different production control policies in terms of their robustness to random disturbances such as machine failures, demand fluctuations, and system parameter changes. Simulation models based on VLSI wafer fabrication facilities are utilized to test the performance of the policies. Three different criteria, namely, the average total WIP, the average backlog, and a cost function combining these measures, are used to evaluate performance. Among the policies tested, the Two‐Boundary Control policy outperforms the others.