基于TMS320F28035的电梯门机控制器设计     

黄玉成 《鸡西大学学报》2014,(11):35-37

针对基于DSP的电梯门机控制系统,在充分分析电梯门机控制器功能需求的前提下,提出了以TI公司DSP芯片TMS320F28035为核心的电梯门机控制器设计方案,其中包括控制器硬件的模块化设计和软件设计。对所设计的控制器进行现场试验,结果表明,门机运行平稳,速度跟随性好,控制器能够很好地完成电梯门机运行过程中的控制任务。  相似文献   

过度运动对肾脏细胞外基质、金属蛋白酶及其抑制因子影响的实验研究   总被引：1，自引：0，他引：1  

佟强  曹建民  吴翱  郭林  王琳  韩治国  周风林 《北京体育大学学报》2006,29(7):931-933

通过在不同运动负荷的运动训练状态下,观察大鼠肾脏组织Col IV、Laminin蛋白、MMP-9酶的表达和尿TP排泄率的变化,以及不同的运动负荷对MMP-9、TIMP-1和ColIVmRNA基因表达的影响,研究不同负荷的运动训练对大鼠肾脏ECM、MMP-9/TIMP-1的影响以及MMP-9/TIMP-1的变化在导致肾脏组织结构、生理功能损害上的作用,进一步探讨运动性蛋白尿的产生机制.实验结果表明:经过8周的过度训练后,C组大鼠肾脏Col IV、Laminin相对于A、B两组出现重度阳性表达,具有显著性差异:Col IV、MMP-9、TIMP-1mRNA表达显著增强,TIMP-1mRNA的表达上调了225%显著大于MMP-9mRNA表达上调147%.且尿TP排泄率也显著升高.说明过度运动训练导致ECM产生增加,降解能力下降,致使肾小球及肾小管基底膜ECM异常代谢、沉积和肾间质纤维化的发生和加剧,肾脏组织超微结构及生理功能受到损害.  相似文献   

F1中国大奖赛在我国的消费需求及其对地区经济影响的调查研究   总被引：1，自引：0，他引：1  

陈锡尧 《武汉体育学院学报》2005,39(8):17-20

就F1赛车对上海及其周边地区的影响作用,通过新秦网对全国范围内18岁以上的4 939人进行了问卷调查。调查结果表明,虽然人们对于赛车文化的理解尚未深入,但是,赛车运动在中国的发展还是很有潜力的。研究认为,F1上海站赛事将会促进上海及其周边地区消费水平的提高,对促进上海及其周边地区的区域经济发展具有巨大的影响作用。  相似文献   

加强创新，实现上海竞技体育的新突破   总被引：3，自引：0，他引：3  

金国祥 《体育科研》2001,22(2):1-5

对上海体育工作中创新的重要性作了全面阐述.列举出五个方面的创新内容,即训练理论和观念;技战术;训练方法手段、管理;以及测试手段和器材设备,同时提出提高创新能力的三方面途径强烈的进取心、深厚的理论功底和辩证的思维方法(超前性思维、联想性思维、逆向性思维、发散性思维).  相似文献   

Modelling and analysis of a basilica under earthquake loading   总被引：1，自引：0，他引：1  

E. Mele  A. De Luca  A. Giordano 《Journal of Cultural Heritage》2003,4(4):355-367

In this paper a basilica-type church is analysed in order to assess its structural behaviour and seismic vulnerability. For this purpose, an effective two-step procedure has been used, consisting of: (a) 3D static and dynamic linear analyses of the structural complex, and (b) 2D nonlinear push-over analysis of the single macro-elements. The results obtained through push-over analyses have been compared to the collapse loads derived from limit analysis, proving the ability of finite element (F.E.) nonlinear model to provide reliable simulation of the actual response of masonry elements. Then, the strength demand on each single structural macro-elements, resulting from the 3D linear analyses, has been compared to the macro-element ultimate strength capacity. The comparison demand vs. capacity has been carried out for all transversal and longitudinal macro-elements of the church, allowing a direct, though approximate, assessment of the seismic safety level of the church. The comparison demand vs. capacity confirms the susceptibility of this type of buildings to extensive damage and possibly to collapse, as frequently observed. The insertion of rigid diaphragms, which represents a widely used retrofit technique, has also been investigated; such intervention triggers concentration of strength demand in the stiffest macro-elements, so that the seismic capacity of the building is not necessarily increased.  相似文献   

Reciprocity of inter-ethnic attitudes in a multicultural society     

J.W Berry  Rudolf Kalin 《Int J Intercult Relat》1979,3(1):99-111

A national survey of multicultural and ethnic attitudes in Canada was conducted in 1974 (n = 1849). Data were analysed for the 1244 respondents whose ethnicity could be determined as Angloceltic, French, German, Italian or Ukrainian Canadian, A five group by five group intergroup attitude matrix was created, with each group acting both as attitude object and as holder of attitudes. Analysis indicated the existence of reciprocity or balance in the matrix: groups tended to reflect the attitude held toward them back onto the group holding the attitude. However this structural balance was moderated by the existence of shared attitudes about the position of a group in the national ethnic hierarchy. Further analysis indicated the existence of ethnocentrism in the matrix: attitudes toward ingroup and positive reference groups were more positive than toward out-groups. Perceived intergroup similarity and familiarity were positively correlated with each other and with intergroup acceptance. Results were discussed in relation to attitude balance theory and ethnocentrism theory, and in their implication for intergroup research in multicultural societies.  相似文献   

九运会艺术体操比赛与世界艺术体操锦标赛个人前8名运动员在4项A2加分的差距分析   总被引：4，自引：1，他引：3  

龙小敏 《中国体育科技》2002,38(10):37-38

采用最新国际艺术体操评分规则对九运会及世界艺术体操锦标赛个人前 8名绳、圈、球、棒的成绩册及比赛录像资料进行分析 ,研究表明 :增加我国运动员各项器械运用并结合难度完成的总数量 ,增加熟练性加分和独创性加分是缩小与世界水平差距的途径  相似文献   

第九届全运会优秀游泳运动员参赛战术探析   总被引：5，自引：1，他引：4  

杨国宽谭政典  陆伯珩 《福建体育科技》2002,21(1):9-12,18

通过对第 9届全运会游泳比赛的现场观察和有关资料的统计分析 ,发现在 10 0、 2 0 0米比赛项目上有半数以上获奖运动员 (前三名 )采用了减速游法 ;在中长距离比赛项目上获奖运动员大部分采用匀速游法 ;几乎所有的破记录运动员在比赛中都采用了匀速游法。  相似文献   

Racial similarity as a moderator variable in the perception of leader behavior and control     

M.Peter Scontrino  James R Larson  Fred E Fiedler 《Int J Intercult Relat》1977,1(2):111-117

This study compared leader behavior ratings of black and white Army infantry squad members serving in squads led either by black or white leaders. One black and one white squad member, chosen at random from each of 34 racially mixed squads, rated their leader's Consideration and Initiation of Structure behaviors (Stogdill, 1963), and their leader's behavior relevant to French and Raven's (1959) five bases of social power. In general, it was found that members who were of the same race as their leader rated him as significantly less likely to use punishment-related behaviors than did members who were of a different race than their leader. However, same-race members did not rate their leader's considerate or structuring behavior differently than did different-race members. The overall pattern of findings were discussed in terms of the leaders' implicit reliance on their punishment power to obtain compliance from different-race subordinates.  相似文献   

基于PIC单片机及阵列电路方式控制大量外设的研究     

陈征  王剑 《科技广场》2012,(10):94-97

本文介绍了PIC单片机的特点,以及利用该芯片、移位寄存器74LS164和阵列电路控制继电器的开关闭合,来实现对大量外部设备的控制。该方法的实现可以有效地节省大量的单片机I/O引脚的使用个数,特别是在一些要实现的功能较多的工程中,效果更为显著。  相似文献