机械密封的失效原因分析与对策

机械密封广泛用于各种类型的泵,是一种精度较高的密封装置,中国铝业公司青海分公司近几年在改造旧泵和添置新泵时均采用了机械密封。在实践中,对机械密封的失效原因进行了分析,并结合实践针对性地提出了安装和使用过程中解决失效问题的措施。     

大学生思想现状分析及对策

依据燕山大学学生思想状况问卷调查结果及座谈、访谈情况,通过深入、细致的分析,总结出当前大学生的几个主要特点,并建设性地提出了相应对策.     

当前我国社会乞讨现象产生和发展的原因分析

当前我国社会乞讨现象的形成是多种因素综合作用的结果,既有历史因素,又有现实因素;既有宏观因素,又有微观因素;既有政治经济因素,又有化心理因素;既有社会的原因,也有人性本身的原因。     

What works,for whom,and in what circumstances? Towards a critical realist understanding of learning in international and comparative education

The article explores the potential for a critical realist approach to researching learning in international and comparative education (ICE) with a particular focus on the emerging post-2015 education and development agenda. It provides a critique of existing empiricist and interpretivist approaches to researching learning. It is suggested that whilst both have strengths, they are based on an ontologically reductionist view of learning with implications for research, policy and practice. As a ‘third’ research approach critical realism has the potential to build on the strengths whilst avoiding the pitfalls of both empiricism and interpretivism. Such an approach it is argued needs to start from an ontologically inclusive and laminated view of learning. Further, it is suggested that comparative research should focus on the development of theories of learning that are able to explain the natural and social structures and causal mechanisms that give rise to and inhibit learning at different scales and levels and in different contexts. The development of theory ought to embrace epistemological pluralism drawing critically on, cross-cultural, inter-disciplinary and mixed methods enquiry and making use of abductive and retroductive forms of inference. In this way it is argued it becomes possible to move beyond the dominant ‘what works’ agenda favoured by empiricists to critically consider what works, for who and under what circumstances.     

Manufacturing Squares: An Integrative Statistical Process Control Exercise

In the exercise, students in a junior‐level operations management class are asked to manufacture a simple product. Given product specifications, they must design a production process, create roles and design jobs for each team member, and develop a statistical process control plan that efficiently and effectively controls quality during production. During an in‐class exercise, students test their plan in a pilot study. After class, they are asked to determine whether their process is stable and capable, critique their plans, and recommend plan modifications before they commence mass production. This exercise provides students with a unique opportunity to combine several fundamental topics from an operations management course into one assignment. Furthermore, assessment of learning outcomes before and after the exercise suggests that it improves learning outcomes in several areas.     

基于链接分析法的北京市各区县档案局网站影响力评价研究

运用链接分析法，对北京市16个区县档案局网站的影响力进行评价并按关联度综合排名；根据评价结果，深入分析北京市区县档案局网站影响力现状及存在问题并提出改进策略。     

Winners and losers of school choice: Evidence from Rio de Janeiro,Brazil and Santiago,Chile

School choice is a controversial topic in the education debate. Proponents argue that choice would open up opportunities to disadvantaged families. Critics counter that choice may exacerbate inequities as advantaged parents are more likely to choose the best schools. Rio de Janeiro and Santiago provide unique institutional contexts in which to explore how choice may affect equity. We use datasets with information on home addresses to compare the choices of parents with different backgrounds. We find that disadvantaged parents in both cities are less likely to choose high achieving schools. The differences are more pronounced in Santiago than in Rio. These results suggest that choice policies will likely not reduce inequities and the design of the program influences behavior.     

L型平面不规则结构的地震反应分析和评估

通过sap2000有限元软件,对建立的L型平面不规则结构进行了模态分析,得到了结构自身的动力特性。在此基础上,利用反应谱分析和时程分析对结构响应的结果进行数值模拟,得到了结构的抗震性能,为设计工作提供了一定参考。     

计算机辅助研究多晶硅加工能耗问题

传统的多晶硅加工能耗计算通常以晶体硅太阳电池产业链为依据,缺乏对光伏发电系统的能量回收期、再利用的考虑,且对于多晶硅生产加工中尾气的合理处理、热量的合理利用、减少污染等的能耗及能量转换研究不足,本文提出用计算机建模、数值分析、模拟等辅助手段,在传统的多晶硅加工能耗计算基础上,设计出含能量回收、转换、尾气、热量利用能量等的一个计算方案,最后讨论了多晶硅加工降耗问题。     

教师信息化领导力的概念、内涵与理论模型

传统的学校信息化领导力研究主要聚焦于校长信息化领导力方面。然而根据团体动力学和分布式领导理论,"领导"不再是个体领导者单向的、静态的、线性的活动,而是组织内不同成员根据自己的能力和环境条件,动态地分享领导角色。教师是学校的中坚力量,是学校决策和教学任务的执行者和实施者,也是推进教育信息化的主力军。教师信息化领导力是学校信息化领导力的一个重要组成部分,是指教师在教育信息化背景下,自觉运用信息化思想和技能,通过教育教学、教学管理、教师专业发展、促进学校信息文化等活动来影响学生、同事和校长以便促进学校信息化教育教学发展和推进教育信息化进程的能力和过程。它由信息技术能力、信息化教学领导力、信息化专业发展领导力和学校信息化文化领导力四个方面构成。这四个构成部分之间相互支持、相互影响,通过在信息化教学活动、信息化专业发展活动和学校信息化环境规划和建设活动中发挥作用来促进学校信息化发展,推动教育信息化的进程。