不同练习手段组合对田径跳跃运动员专项力量训练效果的实验研究

选择八种常用手段,将三种双腿跳跃练习进行组合,另把五种单腿跳跃练习进行组合,对两组14名跳跃项目运动员进行8周的训练,获取了5项身体素质和BIODEX等速测力仪及KISTLER三维测力台的各项指标训练前后的测试数据.实验研究发现,不同的力量练习手段对人体作用是不一样的,轻负荷、重负荷、单腿练习、双腿练习对人体肌肉的影响有各自的特异性.因此,在力量训练中,选择正确而有效的手段和适宜的运动负荷与强度,把各种不同手段进行合理组合,才能求得最佳的综合整体效益.     

Chinese Early Childhood Environment Rating Scale (trial) (CECERS): A validity study

The Chinese Early Childhood Environment Rating Scale (trial) (CECERS) is a new instrument for measuring early childhood program quality in the Chinese socio-cultural contexts, based on substantial adaptation from the Early Childhood Environment Rating Scale-Revised Edition (ECERS-R). This paper describes the development and validation process of CECERS. Empirical data were collected from a stratified random sample 178 classrooms, from which a random sample of 1012 children was measured for child development outcomes. Guided by the framework of broad conceptualization of validity and validation as advocated by Messick (1989), evidence in a variety of forms is presented and discussed, including content validity considerations (e.g., measuring socially and culturally relevant domains), measurement reliability considerations (e.g., internal consistency reliability, inter-rater reliability), and measurement validity considerations (concurrent validity, criterion-related validity, internal structure based on exploratory factor analysis). The empirical findings for CECERS compare very favorably with the validation outcomes of ECERS-R. The body of evidence accumulated in the validation process supports the use and interpretation of CECERS scores as quality indicators of early childhood education program in the Chinese social and cultural contexts. Limitations and future directions are also discussed.     

公允价值计量的利弊分析

认识了公允价值的涵义及基本特征,分析了公允价值计量的利弊,在此基础上提出了克服弊端,发挥优越性的举措。公允价值计量的优越性表现为:适应金融创新的需要;使会计收益更加真实、全面;有利于企业的资本保全;更加符合配比原则的要求;提高信息的决策有用性。公允价值计量的不足之处在于:公允价值确定的主观性较强;可操作性较差;容易导致利润操纵;信息成本较高。基于此认识,提出克服弊端,发挥优越性的两点举措:普及公允价值计量观念和计量的专门技能;尽快完善与公允价值相适应的市场环境。     

Measurement Bias Detection Through Factor Analysis

Assessing the correctness of a structural equation model is essential to avoid drawing incorrect conclusions from empirical research. In the past, the chi-square test was recommended for assessing the correctness of the model but this test has been criticized because of its sensitivity to sample size. As a reaction, an abundance of fit indexes have been developed. The result of these developments is that structural equation modeling packages are now producing a large list of fit measures. One would think that this progression has led to a clear understanding of evaluating models with respect to model misspecifications. In this article we question the validity of approaches for model evaluation based on overall goodness-of-fit indexes. The argument against such usage is that they do not provide an adequate indication of the “size” of the model's misspecification. That is, they vary dramatically with the values of incidental parameters that are unrelated with the misspecification in the model. This is illustrated using simple but fundamental models. As an alternative method of model evaluation, we suggest using the expected parameter change in combination with the modification index (MI) and the power of the MI test.     

湿度的一种测量方法

本文对传统的干湿球湿度计进行了分析,介绍一种根据它的原理,采用鼓泡方式的数学式湿度计,避免通风速度、水质和纱布的影响,得到稳定的测量结果。     

基于嵌入式系统移动物联网系统研究与实现

基于RFID技术的移动物联网应用已比较广泛,RFID技术最大缺陷是信息的单向传输。解决移动物体的信息双向传输,实现具有普遍意义的移动物联网需要解决三个层面的问题-感知层、网络层和应用层。选择嵌入式系统作为控制单元,通过在移动物体上控制单元建立WIFI热点解决网络层问题,应用层则通过将移动物体控制单元设置为wleb服务器实现。     

我国高等教育专业综合评价中质性分析的运用策略

目前,我国高等教育的专业综合评价体系以定量测量为主要手段,质性分析的运用十分有限,主要表现为质性分析认识不足、流于形式和工具缺乏。究其原因主要在于专业综合评价的主体单一,对形成性评价不够重视,缺乏合理有效的质性分析模式。为此,需要更新评价理念,加强对质性分析的理论和实践研究,并在此基础上建立质性分析的运行机制以及配套的监督保障机制。     

Using students’ feedback for teacher education: measurement invariance across pre-service teacher-rated and student-rated aspects of quality of teaching

Comparing self-perceived quality of teaching to students’ perception can be used in higher education to improve the quality of teaching of pre-service teachers in teacher education. However, comparing these measurements from different perspectives is only meaningful if the same constructs are being measured. To shed light on this comparison’s meaningfulness, we scrutinised whether aspects of quality of teaching are measured in the same way across pre-service teachers and their students by means of measurement invariance analyses. To do so, 272 pre-service teachers in teacher education rated aspects of their quality of teaching, and were rated by their 4851 students. Measurement invariance across these perspectives was tested in multilevel structural equation models. Strong measurement invariance held for two aspects of quality of teaching; for the third, one item lacked weak measurement invariance. Pre-service teachers perceived their quality of teaching lower than their students. In conclusion, aspects of quality of teaching can be compared across perspectives, and teacher education should encourage pre-service teachers to use students’ feedback as a valuable resource for improving their quality of teaching.