关于变频调速的应用与节能分析   总被引：1，自引：0，他引：1  

吴文斌  孙开福 《鸡西大学学报》2006,6(6):70-71

文章通过分析变频器调速的节能原理,并结合一个热电厂的变频器改造后的实例,阐述了变频调速的节能效果,提高了设备运行可靠性和节能降耗性。  相似文献   

论水资源管理中的行政分割及其对策   总被引：6，自引：0，他引：6  

黎元生  胡熠 《福建师范大学学报(哲学社会科学版)》2004,(4):54-57

当前我国水资源管理中存在的流域机构权威缺失、条块分割、块块分割和部门分割等体制性缺陷 ,要通过加强流域机构与地方政府协作、建立水资源市场化配置机制、促进流域经济一体化和实现水资源管理职能综合化等措施 ,以此构建水资源管理中的利益协调机制  相似文献   

Coordination pattern of baseball pitching among young pitchers of various ages and velocity levels     

Hsiu-Hui Chen  Chiang Liu  Wen-Wen Yang 《Journal of sports sciences》2016,34(17):1682-1690

This study compared the whole-body movement coordination of pitching among 72 baseball players of various ages and velocity levels. Participants were classified as senior, junior, and little according to their age, with each group comprising 24 players. The velocity levels of the high-velocity (the top eight) and low-velocity (the lowest eight) groups were classified according to their pitching velocity. During pitching, the coordinates of 15 markers attached to the major joints of the whole-body movement system were collected for analysis. Sixteen kinematic parameters were calculated to compare the groups and velocity levels. Principal component analysis (PCA) was conducted to quantify the coordination pattern of pitching movement. The results were as follows: (1) five position and two velocity parameters significantly differed among the age groups, and two position and one velocity parameters significantly differed between the high- and low-velocity groups. (2) The coordination patterns of pitching movement could be described using three components, of which the eigenvalues and contents varied according to age and velocity level. In conclusion, the senior and junior players showed greater elbow angular velocity, whereas the little players exhibited a wider shoulder angle only at the beginning of pitching. The players with high velocity exhibited higher trunk and shoulder rotation velocity. The variations among groups found using PCA and kinematics parameter analyses were consistent.  相似文献   

The key to success in elite athletes? Explicit and implicit motor learning in youth elite and non-elite soccer players     

L. Verburgh  E. J. A. Scherder  P. A. M. van Lange  J. Oosterlaan 《Journal of sports sciences》2016,34(18):1782-1790

In sports, fast and accurate execution of movements is required. It has been shown that implicitly learned movements might be less vulnerable than explicitly learned movements to stressful and fast changing circumstances that exist at the elite sports level. The present study provides insight in explicit and implicit motor learning in youth soccer players with different expertise levels. Twenty-seven youth elite soccer players and 25 non-elite soccer players (aged 10–12) performed a serial reaction time task (SRTT). In the SRTT, one of the sequences must be learned explicitly, the other was implicitly learned. No main effect of group was found for implicit and explicit learning on mean reaction time (MRT) and accuracy. However, for MRT, an interaction was found between learning condition, learning phase and group. Analyses showed no group effects for the explicit learning condition, but youth elite soccer players showed better learning in the implicit learning condition. In particular, during implicit motor learning youth elite soccer showed faster MRTs in the early learning phase and earlier reached asymptote performance in terms of MRT. Present findings may be important for sports because children with superior implicit learning abilities in early learning phases may be able to learn more (durable) motor skills in a shorter time period as compared to other children.  相似文献   

立定跳远教学中TGMD-2的应用研究     

刘上元  杨宁  胡丽萍 《湖北体育科技》2016,(3):252-253

目的:对立定跳远教学进行干预,采用儿童大肌肉群动作发展测试量表(以下简称TGMD-2量表)进行过程性测量,观察干预教学对儿童立定跳远动作发展的影响,寻求发展儿童下肢大肌肉群的有效途径。方法:1)干预前后使用TGMD-2量表对学生立定跳远动作进行评分,并测量远度,进行比较;2)对实验组立定跳远教学进行干预,对照组不做干预。结果:实验组立定跳远评分与远度测量显著提高;对照组评分显著下降,远度测量上升。结论:1)运动干预可以促进儿童立定跳远动作发展;2)儿童动作发展成熟之前可采用TGMD-2量表进行过程性评价。  相似文献   

谈中央对西部大开发的优惠政策与自治权之间的相互协调     

宗那生 《内蒙古大学学报(人文社会科学版)》2001,33(2):12-16

中国西部的大部分地区是民族区域自治地方，因此西部大开发主要是对西部民族自治地方的开发。国家在制定西部大开发的优惠政策时应重点考虑西部民族自治地方的具体情况，民族自治地方也应当结合各自的实际，相应制定特殊政策和灵活措施来保证中央政策的贯彻落实。为此，必须重视中央政策和自治权之间的相互协调。目前，针对中央正在制定的优惠政策，民族自治地方应抓紧做好各自相应配套政策的制定工作。其中对中央政策的具体化和适当补充是主要方面，此外在特殊情况下还应当考虑对中央政策的变通问题。其主要方式是依法制定地方特殊政策或单行条例。  相似文献   

《物理化学》与《无机化学》等课程的协调   总被引：4，自引：0，他引：4  

王基镕 《教育与现代化》2006,(1):22-25

《无机化学》、《普通物理(热学)》、《物理化学》及《高等数学》等四门课程的关系十分密切,如在教学的内容、方法以及知识的应用等方面加以协调,融合,构成一个组合课程,则将在各方面为学生带来诸多意想不到的学习效果。  相似文献   

盗窃机动车辆犯罪的特点、原因及对策   总被引：2，自引：0，他引：2  

胡旭 《重庆职业技术学院学报》2004,13(3):69-70

随着经济建设的发展,车辆成倍增长的同时,盗窃机动车辆案件也逐年上升,给国家、集体和个人造成巨大的经济损失,成为影响社会治安稳定的突出问题.本文就盗窃机动车辆犯罪案件的规律、特点、原因及对策进行了探讨.  相似文献   

论如何加强对YB系列隔爆型电动机的监管     

俞黎  张辰 《泰州职业技术学院学报》2006,6(3):45-47

YB系列隔爆型三相异步电动机,是主要的动力设备,在实际生产生活中得到广泛应用,但是,在对产品的监管上存在着盲区。分析了产品的性能、分类和现状;指出产品监管存在的盲区,主要是企业无标生产,产品没有实施生产许可证制度,提出了解决问题的四个对策。  相似文献   

区域经济协调：西部基础设施建设中值得注意的问题   总被引：1，自引：0，他引：1  

李相合 《内蒙古师范大学学报(哲学社会科学版)》2004,33(6):60-64

西部基础设施建设是一个系统工程,是西部经济发展的物质条件,也是全国经济和社会发展总系统的重要组成部分,各区域协调发展,任重道远。西部基础设施建设必须注意以下几方面的协调:科学规划,统筹协调;区域开发与突出重点协调;基础设施建设与非基础设施建设协调;基础设施建设与生态保护协调;城市基础设施建设与农村基础设施建设协调。  相似文献