Sampling Strategies for Toxic Air Contaminants

Annual concentrations of toxic air contaminants are of primary concern from the perspective of chronic human exposure assessment and risk analysis. Despite recent advances in air quality monitoring technology, resource and technical constraints often impose limitations on the availability of a sufficient number of ambient concentration measurements for performing environmental risk analysis. Therefore, sample size limitations, representativeness of data, and uncertainties in the estimated annual mean concentration must be examined before performing quantitative risk analysis. In this paper, we discuss several factors that need to be considered in designing field-sampling programs for toxic air contaminants and in verifying compliance with environmental regulations. Specifically, we examine the behavior of SO2, TSP, and CO data as surrogates for toxic air contaminants and as examples of point source, area source, and line source-dominated pollutants, respectively, from the standpoint of sampling design. We demonstrate the use of bootstrap resampling method and normal theory in estimating the annual mean concentration and its 95% confidence bounds from limited sampling data, and illustrate the application of operating characteristic (OC) curves to determine optimum sample size and other sampling strategies. We also outline a statistical procedure, based on a one-sided t-test, that utilizes the sampled concentration data for evaluating whether a sampling site is compliance with relevant ambient guideline concentrations for toxic air contaminants.     

具有中国特色的执政党建设理论的创立——兼谈改革开放30年党的建设的经验

改革开放的每一重大战略部署和伟大实践，都包含着党的建设的新举措和党的建设理论的新探索。党的建设的实践和理论的每一创新发展，也反过来推进和保证了中国特色社会主义经济、政治、文化、社会建设和各个领域的改革。中国共产党对历史方位转变和执政党建设理论的认识，已经达到了新的高度，提出要“深化对共产党执政规律的认识”这一命题，本身就是中国共产党在30年党的建设理论创新过程中，获得的一个重要成果。我们研究具有中国特色的马克思主义执政党建设理论。从根本上说，就是要认识执政规律，尊重执政规律，努力按照执政规律加强执政党建设，加强和改善党对中国特色社会主义事业的领导，完成党肩负的伟大历史使命。     

畜产品质量安全监管研究综述

随着经济的发展和社会的进步，畜产品在人们的日常生活中占有越来越重要的地位，目前我国对畜产品质量安全的监管还很不到位。文章总结了我国畜产品安全监管的现状，并介绍了国外畜产品安全监管的现状，通过比较找出我国监管的不足，从而进一步加强我国对畜产品质量安全的监管。     

基于人文关怀的高校贫困学生资助策略思考

在我国高等教育迅速发展的过程中,高校家庭经济困难的学生数量也在大幅增加,贫困生现象日益凸显。本文通过分析高校贫困生的状况及需求,并试图从人文关怀的层面探讨当前如何更好地推进高校贫困生工作。     

The Impact of Taking Parental Leave on Fathers’ Participation In Childcare And Relationships With Children: Lessons from Sweden

In Sweden, government-mandated paid parental leave has been available to both mothers and fathers since 1974. By 2006, each parent had two non-transferable leave months and nine additional months to share. From the beginning, parental leave was presented as a policy designed to promote gender equality, with women and men having equal opportunities and responsibilities to contribute economically to the family and care for children. Sweden thus provides a unique setting to explore whether social policy can be an important instrument for changing the gender contract. Analysing survey data from 356 fathers working in large private companies, we found that the amount of parental leave days taken had positive effects on several aspects of fathers’ participation in childcare and on their satisfaction with contact with children, controlling for other factors contributing to fathers’ participation in childcare. Our findings suggest that the full potential of Sweden's parental leave policy for degendering the division of labour for childcare will not likely be met until fathers are strongly encouraged by social policy to take a more equal portion of parental leave.     

构建基于4C模式高校新型师生关系的探讨

随着教育改革的不断深入,建立与时代相适应的新型师生关系非常有必要.建立新型的师生关系,是构建和谐校园的坚实基础,是全面提高教育质量,实现高校可持续发展的重要条件.文章在分析师生关系现状的基础上,研究构建新型师生关系的动因,对如何构建基于4C模式的新型师生关系进行了探讨.     

卧式椭圆轨迹振动筛的自定中心问题研究

当振动筛筛箱各点作长轴平行于筛面的椭圆轨迹运动时,这种振动筛的胶带轮不可能只作定轴转动(即自定中心)。如果恰当地选择胶带轮几何中心的偏心值,胶带轮的摆动幅度将减小,因此,胶带的工作情况仍将得到改善。     

科技传播研究:“普及范式”和“创新范式”

国内科技传播研究在近几年渐见繁荣之势。为了促进科技传播研究在国内更好地发展，文章讨论了已得到一定发展的“普及范式”和正在发展中的“创新范式”，认为面向未来知识经济的发展，需要推进“创新范式”的科技传播研究。     

发展和完善南宁市新型农村合作医疗制度研究

近年来,党和政府一直把发展和完善新型农村合作医疗制度作为改善民生的一项重要工作。南宁市新型农村合作医疗尽管有了较大的发展,但与同为西部省会城市的西安、昆明、成都相比还存在不少差距。这就需要结合地方实际,从运行机制、资金监管、信息化管理、人才建设等软、硬件方面破解新型农村合作医疗制度发展和完善的难题。     

春秋时期郑、宋、卫世族政治的历史变迁

春秋时期，郑、宋、卫三国基本上是因循旧制，任用公族执政。但由于历史传统、现实国情不同，三国的世族政治亦表现出了不同的特色。郑国世族形成较晚，“七穆”兴起后，郑国形成了卿大夫执政制，诸卿互相制衡、联合执政，使郑国国内保持了相对的稳定。宋国政治的特点是君权较强，政权下移较缓，君权在与卿权的斗争中稍占上风。直至春秋末期，宋国政权才完全落入“戴氏”的手中。卫国在春秋早期社会矛盾的焦点是公室内部争夺君位的斗争。春秋中叶，卫国的世族势力壮大，公室与卿大夫之间的矛盾开始激化。春秋晚期，卫国君位争夺与君卿斗争互相交织，内乱频仍。南氏乘机崛起，并在战国时夺取了政权。尽管春秋时期郑、宋、卫的政治各具特色，但其总的发展趋势是相同的，即经过公室与世族、世族之间的激烈斗争，列国最终均出现了“礼乐征伐自大夫出”的政治局面。