电动跑台对提高竞走运动员步频的研究   总被引：5，自引：0，他引：5  

王林  郑沪娥 《中国体育科技》2003,39(10):57-59

采用竞走运动员无氧阈值速度的测定与应用方法 ,分别对运动员进行 3个阶段逐级提高速度的跑台竞走实验 ,经过统计学处理和实际比赛的对比 ,结果表明 :利用电动跑台进行辅助训练 ,可以加快发展竞走运动员的动作速率 ,有效提高竞走运动员的步频 ,创造优异成绩。  相似文献   

Smart structures and materials     

V. K. Wadhawan 《Resonance》2005,10(11):27-41

A structure is an assembly that serves an engineering function. It is reasonable to expect that all engineering design should be smart, and not dumb. But one can still make a distinction between smartly designed structures and smart structures. The latter term has acquired a specific technical meaning over the last few decades. A smart structure is that which has the ability to respond adaptively in a pre-designed useful and efficient manner to changes in environmental conditions, including any changes in its own condition; the response is adaptive in the sense that two or more stimuli or inputs may be received as anticipated and yet there is a single response function as per design. Smartness ensures that the structure gives optimum performance under a variety of environmental conditions. While structures with some degree of smartness have been designed from times immemorial, the current activity and excitement in this field derives its impetus from the level of sophistication achieved in materials science, information technology, measurement science, sensors, actuators, signal processing, nanotechnology, cybernetics, artificial intelligence, and biomimetics.  相似文献   

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   

Helical angle measurement of worm by a coordinate measuring machine and its uncertainty evaluation     

QIU Yong-you  KANG Shuang-yang  PENG Yun-feng  YANG Ping  HUANG Zi-qiang 《重庆大学学报(英文版)》2016,15(4):139-148

The purpose of the study concerns the measurement of worm’s helical angle by a coordinate measurement machine in the ambient industrial environment. The novel measurement method and sampling strategy were described firstly. This method used the coordinate measurement machine to measure both of the worm gear’s left and right surfaces. The worm surface was reconstructed based on the measured data of all the sampling points. Then a middle cylinder was established to truncate the fitted worm surfaces, and the truncated spiral lines were straightened to calculate the helical angle. The measurement uncertainty of worm’s helical angle was evaluated by taking the difference of calculated helical angles along the truncated spiral lines on both the left and right side surfaces of the worm. Twenty-four measurement experiments show that the maximum measurement error of the proposed method is 0.105, and the measurement error ratios are all less than 3.5?. The result means that the measurement method can realize the precision measurement of worm’s helical angle and can be employed in the generally industrial application.  相似文献   

氧化还原滴定反应计量点电势通用计算公式探讨     

廖清涛 《赣南师范学院学报》2003,(6):45-47

对氧化还原滴定反应计量点电势的通用计算公式进行了具体深入的探讨,对公式作了准确表述和具体证明.该通用计算公式能解决对称电对、不对称电对和有H+参加的氧化还原滴定反应计量点电势的计算.  相似文献   

电磁场──物质的基本形式之一     

孟继德 《陕西理工学院学报(社会科学版)》1996,(3)

电磁场是物质的基本形式之一，它无需电荷激发，而是自然界固有的；电荷只是为了描写电磁场而引入的一过渡量．并由此提出了一个计算电子电能的设想．  相似文献   

局部热处理工艺在大型主轴中的应用     

吴雄彪  郑一平 《金华职业技术学院学报》2001,1(1):34-36

在机械制造过程中，对大型工件进行退火处理都有一定难度，而对结构紧凑、不同组件又有不同的性能要求的大件进行退火处理更加困难，如何克服对主件处理时不影响其它组件的性能呢?本文采用陶瓷电加热器进行局部热处理的方法，较好地解决这一难题，具有普遍的借鉴意义。  相似文献   

板式电位差计与箱式电位差计的区别与联系     

孟桂菊  郭茂政  杨利霞 《黄冈师范学院学报》2002,22(3):74-75

通过分析两种电位差计的结构，讨论了它们在实际应用中的区别与联系。  相似文献   

矿井多风机风压优化计算机调节系统设计     

王国臣  刘宪文 《鸡西大学学报》2001,(3)

经过对多风机通风网络分析,利用现有的VNETPC模拟程序,建立了多风机风压优化计算机调节系统.该系统允许计算机自动调整多风机风压,直到各用风地点获得最佳可接受的风量分配为止.  相似文献   

谈双电桥的灵敏度   总被引：1，自引：0，他引：1  

夏莉艳  张良  周薇 《伊犁师范学院学报》2006,(3):51-54

通过理论和实验两个方面,讨论了如何测量双电桥的灵敏度及影响双电桥灵敏度的因素.  相似文献