关于足球专修课成绩评定问题的探讨     

蔡向阳  朱六一 《武汉体育学院学报》2003,37(5):90-92

采用文献资料法、调查法、因素分析法和实验法，对足球专修学生成绩的评定问题进行了比较系统的综合研究，为制定评定学生足球专项成绩体系和权重等提供了客观依据。建立了技、战术考核评分模式。  相似文献   

400 m跑优秀运动员数学模型的建立及应用     

陶江  李娟  马时忍 《体育学刊》2006,13(3):119-121

以世界优秀田径运动员为例,分析了决定400 m短跑的各种因素以及它们所占的比重,并据此建立了数学模型,从而将以往的定性分析转化成定量分析。帮助教练和运动员准确而快捷地根据400 m优秀运动员的模式并结合自身的特点来合理分配体力和时间,以取得更好成绩。  相似文献   

步进式冷床的结构分析及其现场维护     

李军  代鑫 《辽宁科技学院学报》2012,14(2):8-9

介绍了特钢厂800轧线大棒步进式冷床的结构形式及工作原理。总结了该装置使用以来由于设备安装缺陷而产生的故障,并对部分改进方案的实施性、可靠性进了的分析,并采取了相应的改进措施。  相似文献   

Performance differences when using 26- and 29-inch-wheel bikes in Swiss National Team cross-country mountain bikers     

Thomas Steiner  Beat Müller  Thomas Maier  Jon Peter Wehrlin 《Journal of sports sciences》2016,34(15):1438-1444

The purpose of this study was to analyse the effect of bike type – the 26-inch-wheel bike (26“ bike) and the 29-inch-wheel bike (29“ bike) – on performance in elite mountain bikers. Ten Swiss National Team athletes (seven males, three females) completed six trials with individual start on a simulated cross-country course with 35 min of active recovery between trials (three trials on a 26“ bike and three trials on a 29“ bike, alternate order, randomised start-bike). The course consisted of two separate sections expected to favour either the 29“ bike (section A) or the 26“ bike (section B). For each trial performance, power output, cadence and heart rate were recorded and athletes’ experiences were documented. Mean overall performance (time: 304 ± 27 s vs. 311 ± 29 s; P < 0.01) and performance in sections A (P < 0.001) and B (P < 0.05) were better when using the 29“ bike. No significant differences were observed for power output, cadence or heart rate. Athletes rated the 29“ bike as better for performance in general, passing obstacles and traction. The 29“ bike supports superior performance for elite mountain bikers, even on sections supposed to favour the 26“ bike.  相似文献   

车辆轮轴称重仪的误差分析     

郑惠群 《宁波职业技术学院学报》2005,9(5):10-12

轮轴称重仪是测量车辆各轮、轴重及车辆总重的称重仪器,影响轮轴称重仪称重误差的因素很多,本文将车辆本身结构对轮轴称重仪的误差影响及其他因素的误差影响进行全面分析.  相似文献   

核心素养在高职称量实训教学设计中的体现     

刘甜 《教育教学论坛》2019,(16):243-244

在教学设计中,核心素养是三维课程目标的继承与发展,是教学适应社会发展的理论指导。社会生活对于学生的发展提出新的要求,这种要求在职业教育阶段更为突出。在食品、药品生产与经营相关专业的职业教育中,做出精准快速的称量操作,是学生应该掌握的基础技能和职业素质。这项实训课程应不断创新教学设计,体现核心素养。  相似文献   

发动机曲柄连杆机构常见问题及维修策略     

保承军  徐宏彤 《荆门职业技术学院学报》2007,22(3):10-12,16

在发动机维修中,曲柄连杆机构的维修是重中之重,它的维修好坏对发动机的正常工作和使用寿命有很大的影响。文章对发动机曲柄连杆机构常出现的问题进行分析,提出一些正确的使用和维修方法与大家共勉。  相似文献   

4×4载货汽车的设计要点技术分析     

鲍晓东 《北京工业职业技术学院学报》2007,6(4):11-16

以一吨4×4载货汽车的设计为例，对特殊性能进行专门系统的理论分析，寻求比较合适的4×4载货汽车的设计要点。通过计算分析，得出在轴距的选择、轮距的确定、动力总成及各大总成的布置、横向稳定杆的选择、汽车的摆振控制等方面应重点考虑，才能使4×4载货汽车设计趋于合理。  相似文献   

Transient Responses of Flexible Non—uniform Spinning Shaft with Nonlinear and Asymmetric Supports     

ZHUHuai－liang 《上海大学学报(英文版)》2001,5(1):35-39

In this paper ,a hybrid approach was developed to investigate the transient responses of a multi-span non-uniform flexble spinning shaft with nonlinear and asymmetric supports.The non-uniform spinning shaft with variable parmeters was modeled as a Bernoulli-Euler beam column with sectional constant cross-section properties by the finite element method.The supporting stiffness behavior of the nonlinear supports was described as a piecewise-linear and asymmetric model.The equations of motion in the matrix form of a multi-span non-uniform spinning shaft with nonlinear and asymmetric supports were formulated using Hamilton‘s principle and the assumed mode method.As an example,a spinning rocket with many variable stiffness supports was numerically simulated by the direct integration method.The transient response and dynamic behavior of this rotate-dynamic system are analyzed.  相似文献   

高炉不停风更换转炮减速机蜗轮的方法     

孙景云 《辽宁科技学院学报》2007,9(1):29-30

文章概述了高炉电动泥炮的主要机构及其转炮的工作情况,分析了高炉不停风更换转炮减速机蜗轮的原因,并提出更换转炮减速机蜗轮的方法.  相似文献