污油池油位远程监控报警系统的研发

介绍了双良燃油锅炉经常发生污油池出口有污油溢出现象,并针对性对污油池的电控部分创新研发污油池油位远程监控报警系统装置,有效地解决了污油池出口有污油溢出现象,避免能源浪费和环境污染。     

天津市第11届全运会参赛项目布局分析与启示

运用比较优势理论,对天津市第11届全运会竞技体育优势项目布局进行分析,探讨天津市竞技体育发展及备战第12届全运会的启示。研究结果表明:(1)天津市第11届全运会参赛项目中排球、网球、水球、击剑、沙滩排球、武术套路、跳水、柔道、游泳、自行车10个项目为比较优势项目;(2)比较潜优势项目有足球、乒乓球、体操、举重、跆拳道、田径6个项目;(3)保持比较优势项目竞争实力,提升比较潜优势项目竞争实力,结合项目特点,实现男女项目优势互补,资源共享,确保天津市12运会竞赛目标的实现及竞技体育整体水平的提高。     

山东省3000米障碍赛运动员姜冰的动作技术诊断

使用二维高速摄像技术,采用APAS和Dartfish动作解析软件对山东省优秀3 000米障碍赛运动员姜冰的过栏及过水池技术动作进行定量分析。发现姜冰在完成跨栏动作时,步速过慢,影响其跨栏距离。建议在今后的跨栏训练中注意训练栏前的加速。在过水池时助跑最后一步步幅偏大,导致加速不足,过栏时动作幅度偏小,导致落地距离偏小,双足湿显著影响比赛成绩。建议其在助跑过程中采用小步加速的方法,增加上栏前的水平速度。     

跳动公差是形位公差的综合项目

跳动公差以其检测方便在回转类零件设计中被广泛使用。不少人认为:跳动公差是专为检测方便而设置的一种位置公差项目,国家标准形位公差(GB1182-80)也将跳动公差项目归类为位置公差。其实,跳动公差除了可以综合控制部分形位公差项目外,当跳动与零件的实际工作状态吻合时,就有其特定的功能和作用,所以说,跳动公差不是简单的位置公差,而是形位公差的综合项目。     

适应用户兴趣变化的协同过滤增量更新机制

高维、稀疏的用户-项目评分矩阵对基于项目的协同过滤推荐算法造成严峻的可扩展性问题.传统的解决方法是离线计算项目相似性并保存在系统中以供算法调用,但是不能充分利用最新评分数据以体现用户兴趣的变化.针对上述问题,提出了适合在线应用的协同过滤项目相似性增量更新机制,使得推荐系统在当前用户提交项目评分之后,能够实时完成相应项目与其他项目之间的相似性数据更新,从而推荐系统可以基于最新的项目相似性数据进行推荐处理,以适应用户兴趣的变化.实验结果表明,本文提出的项目相似性增量更新机制能够有效提高基于项目的协同过滤算法可扩展性.     

行为引导型教学法在《空调器原理与维修》课程中的应用

“行为引导型”教学法强调对人的关键能力的培养。在《空调器原理与雏修》课程教学中运用此法不仅能提高学生的关键能力。而且能使他们体验艰辛、发挥潜能。其具体过程包括确定项目任务、制定计划、实施计划、检查评估等环节,每一个环节都注重学生的广泛参与和主动实践。     

Teacher commitment and its effects on student achievement in American high schools

This study explored the effects of teacher commitment on student achievement. Three teacher commitment dimensions of organizational, professional, and student commitment were derived. The three-dimensional teacher commitment measurement model was tested by a confirmatory factor analysis. Then, the relationships among individual and organizational variables, teacher commitment, and student achievement were analyzed by a 2-level hierarchical linear modeling method. As the results, the greater portions of teacher commitment and student achievement variances were within schools. The individual and organizational variables had differential impacts on each teacher commitment dimension. Finally, while teacher commitment effects on student achievement were differentially found depending on teacher commitment dimensions at the individual level, there was no evidence to support significant impacts of teacher commitment on student achievement at the organizational level.     

Benchmarking the performance of Bhutanese students with the performance of the students from the OECD's PISA countries

Setting international benchmarks for education systems of the Organisation for Economic Co-operation and Development (OECD) countries is one of the goals of the OECD's Programme for International Student Assessment (PISA). However, some countries are not able to participate in PISA, despite their desire to set international benchmarks for their education systems. This article presents a method of setting international benchmarks for a country's school education system, without necessarily participating in PISA, by designing a test using the test items released by PISA for public consumption. The method has been implemented in a study that involved 1,500 Grade 10 students across 60 schools in Bhutan. The students were administered a mathematics test constructed from the PISA Mathematical Literacy test items. The study showed that the performance of Bhutanese students was comparable with the performance of the students from the countries that participated in PISA 2003 and that Bhutan could learn from both high- and low-performing school education systems of those countries.     

新加坡南洋理工学院项目教学法的启示

新加坡南洋理工学院的项目教学方法独树一帜。本文研究借鉴南洋理工学院的项目教学方法,提出提高教师动手能力、课程融合、科学设计教学题目、项目教学系统化建设的观点,促进高职教学质量的提升。     

Combining IRT and SEM: A Hybrid Model for Fitting Responses and Response Certainties

This article proposes a model-based procedure, intended for personality measures, for exploiting the auxiliary information provided by the certainty with which individuals answer every item (response certainty). This information is used to (a) obtain more accurate estimates of individual trait levels, and (b) provide a more detailed assessment of the consistency with which the individual responds to the test. The basis model consists of 2 submodels: an item response theory submodel for the responses, and a linear-in-the-coefficients submodel that describes the response certainties. The latter is based on the distance-difficulty hypothesis, and is parameterized as a factor-analytic model. Procedures for (a) estimating the structural parameters, (b) assessing model–data fit, (c) estimating the individual parameters, and (d) assessing individual fit are discussed. The proposal was used in an empirical study. Model–data fit was acceptable and estimates were meaningful. Furthermore, the precision of the individual trait estimates and the assessment of the individual consistency improved noticeably.