BOOK REVIEWS

Children with motor learning difficulties (MLD) tend to be less physically active than their coordinated peers and one likely consequence is a reduced level of physical fitness. In this study, 52 children with MLD, aged 5 to 8 years, were compared to 52 age‐ and gender‐matched control children across a range of health and skill related fitness components. Analyses of variance revealed significantly lower scores in the group with MLD on the tests for cardiorespiratory endurance, flexibility, abdominal strength, speed and power than the control group. Furthermore, the group with MLD had a significantly higher Body Mass Index (BMI). These findings have implications for educators and allied health professionals working with this age group. Programmes need to teach children with movement difficulties to perform tasks used in fitness assessment and also to work on the development of physical fitness.     

异步电动机矢量控制特性研究

本文针对异步电动机变频调速原理,结合变频调速矢量控制策略,基于Matlab/Simulink工具箱,建立了异步电动机矢量控制变频调速系统仿真模型,对异步电动机的矢量控制特性进行研究。设置了多种电机运行状态,对电机的空载、加载、加速、减速等动态特性进行仿真研究,验证了所建立的仿真模型的正确性和可行性。     

基于S7-200 PLC的三维机械手控制设计

为了提高机械手在工业生产中定位的精度,提出了一种用步进电机驱动的三维机械手的装置。机械手手臂和躯干的运动用步进电机驱动,依靠接近开关以及光电编码器的精确定位,利用S7-200作为控制器来实现对机械手的控制。控制方案中详细论述机械手控制系统的硬件结构及软件实现方法。测试表明,该系统具有较高的应用价值。     

永磁直线同步伺服电机的端部效应分析

现代高档数控机床对伺服进给系统提出了高速、高精度的双重要求,采用永磁直线电机直接驱动是实现机床高速、高精度进给的必要途径之一。然而,由直线电机端部效应引起的扰动,也成为影响着机床主轴系统性能的主要因素。本文系统地分析了永磁直线同步伺服电机的静态纵向端部效应、静态横向端部效应、动态纵向端部效应和动态横向端部效应的起因、机理及对电机性能的影响。     

Gentile运动技能分类法应用于羽毛球教学的实验研究

根据金特尔（Gentile）二维分类法,对羽毛球正手高远球技能操作从环境背景和动作功能两个维度进行分类,并将其运用到教学实验中,该实验采用自身比较法和组间对比法。教学结果表明：实验组羽毛球正手高远球技术得到明显提高,其技术动作规范程度优于对照组。通过对两组同学羽毛球正手高锭球技术的综合测试,实验前后两组同学的考核结果呈...     

基于GPRS的DTU在水面蒸发测量中的应用技术研究

江河湖面的水面蒸发测量有测点多、分布散的特点,测量数据采集的实时性难以保证。本文利用现有的GPRS无线通信平台,对测量设备添加DTU模块,完成水面蒸发数据的远程采集及处理,同时为相似分布式测量系统的数据采集提供解决方案。     

电机的起源与发展方向

电机是我们生活的主要部分。它的诞生到现在经历了差不多两百年的时间。他为我们的生活和生产带来了很多便利。但近期一直发展缓慢,它的发展前景将如何?在这里,笔者就此谈一些浅薄看法。     

从翻译生态学的角度探究汽车广告语翻译中的限定因子

翻译生态学是一门新兴的边缘学科,通过运用翻译生态学的基本原理之一,即限定因子定律,并把这一定律运用于分析汽车广告语翻译的各种生态限定因子,而经济效益、创意性能、美感体验、文化适宜就是汽车广告语翻译中的限定因子。文中通过了解这些限定因子之后,从而选择恰当的翻译策略来更好地指导汽车广告语的翻译。     

'Raising the bar': views on play and training in the Move & Walk pedagogy

In this study 20 beginning special education teachers were asked to describe their experiences in general education settings. To provide data, each teacher completed approximately three electronic reflective journals during a school year and also participated in a phone interview, which was aimed to give in-depth information regarding the participants’ comments in the journals. The participants described their experiences in regard to collaboration with mainstream teachers, the delivery of the curriculum and the understanding of their role with reference to identity. They reported some good experiences but also many difficulties in their attempts to support pupils with special educational needs (SEN) and enhance their learning and participation in mainstream schools. Challenges in collaboration, the delivery of the curriculum and the development of teachers’ identity at the beginning of a career in special education are discussed. We argue that the teachers’ experiences are associated with the legislative educational system and the school culture which does not encourage collaborative practices but rather promotes individualism and leads to exclusive practices.     

The direct and indirect effects of motor competence on adolescents’ mental health through health-related physical fitness

ABSTRACT

Mental health is an important public health issue and up to one in five youth experience mental health problems. The primary purpose of this study was to examine the relationship among motor competence, health-related physical fitness and mental health outcomes in adolescents. A secondary goal was to test the direct and indirect effects of motor competence on adolescents’ mental health through health-related physical fitness. Participants were 279 adolescents (M_age = 12.49, SD = 0.89) recruited in the south-west region of the US Motor competence including volleyball, soccer, and ultimate Frisbee, were assessed using PE Metrics?. FITNESSGRAM® test battery was used to assess health-related physical fitness components. Students completed a survey measuring their depressive symptoms and health-related quality of life. Motor competence was significantly associated with components of health-related physical fitness (r ranged from ?0.15 to 0.38). The robust fit of the model supports the significant indirect effect of motor competence on mental health outcomes through health-related physical fitness (χ²/df = 39.92/25; CFI = 0.97; RMSEA = 0.046; 90% CI [0.02, 0.07]). The hypothesized conceptual model tested in this study provides insights into the potential interaction of motor competence and health-related physical fitness with adolescents’ mental health.