对学龄前智力落后儿童游戏的思考--兼谈感觉运动统合疗法的游戏性

智力落后儿童的早期干预要注意游戏性、趣味性原则是大多数学前特殊教育工作者所认同的。但由于智力落后儿童身心各方面发展均有别于正常儿童 ,使家长和教师难以从一般的角度来把握智力落后儿童的游戏。因此本文对智力落后儿童的游戏特点这问题作论述 ,来分析近年来越来越多地用在智力落后儿童身上的感觉运动统合疗法的游戏性。     

迷宫电脑鼠电机控制系统设计

本文介绍以IEEE标准电脑鼠走迷宫竞赛为背景,以专用控制芯片MC33035、MC33039为核心构成的永磁无刷直流电机控制器,主要涉及核心控制电路的构成、功率开关元件的驱动、转速显示电路的实现、保证系统运行可靠性的抗干扰及EMC防治措施。     

Fundamental motor skills,nutritional status,perceived competence,and school performance of Brazilian children in social vulnerability: Gender comparison

Being at risk or in social vulnerability situations can affect important aspects of child development. The aim of this study was to investigate fundamental motor skills (locomotor and object control) and school (writing, arithmetic, reading) performances, the perceived competence and the nutritional status of girls and boys living in social vulnerability in the poorest regions of Brazil. Two hundred eleven (211) children (87 girls, 41%), 7–10-year-old (M = 8.3, SD = 0.9), from public schools in Ceará (Brazil), living in social vulnerability, participated in the study. Children were assessed using the Test of Gross Motor Development – 2, the Body Mass Index (BMI), the Self-Perception Profile for Children, and the School Performance Test. Multivariate analysis of covariance (MANCOVA), adjusted for age, did not show any significant effect for locomotion. There was an effect of gender on the object control. Boys showed higher scores in striking, kicking, throwing, and rolling a ball. Quade's nonparametric analysis showed no difference in BMI between the genders. Most children presented healthy weight. The MANCOVA showed no effect of gender on children’s scores on perceived competence on the subscales; moderate scores were found for most children. There were no gender effects on school performance; both boys and girls demonstrated inferior performance. Boys and girls in social vulnerability showed inferior performance in most motor skills, moderate perceived competence and inferior school performance. These results reveal that the appropriate development of these children is at risk and that intervention strategies should be implemented to compensate the difficulties presented.     

新型双桥路三相交流逆变器的研究

逆变器的谐波问题一直是困扰电气工程师的一大难题，也是衡量交流逆变器的一个重要指标．利用电气相角的偏差和电磁效应的叠加原理来实现控制策略，可以有效地消除或抑制谐波，使三相逆变器输出电压的质量得到提高．仿真结果表明，双桥路逆变器的电压输出波形比常规的三相逆变器的电压输出波形好．     

基于C/S与B/S模式的汽车衡称重管理系统设计

根据煤炭行业在汽车衡称重方面的要求,介绍了一种基于C/S和B/S相结合模式而设计的汽车衡称重管理系统,以实现煤矿称重过程的计算机监控和提高公司的工作效率及管理水平之目的。并从汽车牌号自动识别、称重现场交通管理等方面进行了重点分析。     

Gross motor coordination in junior tennis players

The purpose of this study was twofold: (1) to determine the gross motor coordination performance levels of junior tennis players and (2) to analyse the effects of age and gender. Participants were junior male (n = 50) and female (n = 51) tennis players aged 6–14. Körperkoordinationstest für Kinder (KTK) was used to assess the gross motor coordination of the participants. Results revealed that none of the participants performed lower than normal level in motor coordination. Besides, 40.6% of the participants performed above normal level. No gender differences were found on all subtests of KTK and also on total motor quotient. Although older players performed better on each test than their younger counterparts for the raw scores, no significant age effect was observed on motor quotient scores among different age groups.     

The role of a vertical reference point in changing gait regulation in cricket run-ups

The need to identify information sources which facilitate a functional coupling of perception and action in representative practice contexts is an important challenge for sport scientists and coaches. The current study investigated the role of visual information in regulating athlete gait behaviours during a locomotor pointing task in cricket. Integration of experiential knowledge of elite coaches and theoretical understanding from previous empirical research led us to investigate whether the presence of an umpire would act as a vertical informational constraint that could constrain the emergent coordination tendencies of cricket bowlers’ run-up patterns. To test this idea, umpire presence was manipulated during run-ups of 10 elite medium-fast bowlers. As hypothesised, removal of the umpire from the performance environment did not result in an inability to regulate gait to intercept a target, however, the absence of this informational constraint resulted in the emergence of different movement patterns in participant run-ups. Significantly lower standard deviation values of heel-to-crease distances were observed in the umpire condition at multiple steps, compared to performance in the no-umpire condition. Manipulation of this informational constraint altered gait regulation of participants, offering a mechanism to understand how perception–action couplings can be varied during performance in locomotor pointing tasks in sport.     

单芯片实现高速摄像机运动控制系统的一种设计方案（系统分析篇）

作者描述了作为高速球型摄像机运动控制系统主要执行元件——步进电机的驱动原理和控制方案。报告应用基于模型的技术,分析了步进电机的特性,设计了一种在单芯片（SoC,System On Chip）上实现的新型高速球型摄像机运动控制的电子系统级方案。该方案针对步进电机高精度驱动控制设计需求,建立了运动控制电子系统各个设计层次上的模型,通过仿真探索其系统架构及性能优化。文章分两篇组织,系统分析篇（设计目标,系统分析）和系统综合篇（系统设计）。     

The effect of different goals and self-recording on self-regulation of learning a motor skill in a physical education setting

This study examined the effect of different goals (process, performance outcome, and multiple goals) and self-recording on self-regulation of learning a dart-throwing skill. Participants were 105 fifth and sixth graders who were randomly assigned to six (3 Goal type × 2 self-recording) experimental and one control group. Results showed a positive effect of self-recording on students’ performance, while no difference was found between the goal conditions. Moreover, goal group students made more technical attributions and adaptive inferences compared to the control group students. Results are discussed with reference to self-regulated learning, the pursuit of multiple goals and self-recording in physical education.     

基于模糊控制的直流调速系统调节器设计与仿真

利用模糊控制在非线性控制方面的突出优势,将之应用于直流调速系统,设计出模糊PI控制器,MATLAB仿真结果表明,该控制器能够有效提高系统性能,具有实际应用价值.