基于线阵CCD的迈克尔逊干涉仪测量金属丝的弹性模量   总被引：1，自引：0，他引：1  

漆建军  马文华  肖化 《实验室研究与探索》2010,29(1)

对现有迈克尔逊干涉仪予以简单改造,通过在金属丝上持续而均匀加力的变化引起金属丝细微伸长进而带动移动镜移动,从而引起光屏上干涉圆环数目的变化;通过对干涉圆环的自动精确记录就可以实现对金属丝微小伸长量的测量,提出了一种用线阵CCD作为光电传感器件捕捉干涉圆环的光强信号,再将电信号进行模数转换。采取USB接口与微机接口,用C++语言编写程序设计了一种新型的干涉圆环自动计数软件。将这种计数方法与金属丝弹性模量的测量结合起来,可以自动得出金属丝的弹性模量,且提供了一种交互性强的友好图形界面。  相似文献   

Backlash analysis of a new planetary gearing with internal gear ring     

ZHU Cai-chao  XIAO Ning  ZHANG Xiao-rong 《重庆大学学报(英文版)》2010,9(3):151-158

Due to low carrying capacity and short life of current ring reducer, we proposed a new planetary gearing with internal gear ring, which consisted of two stages. One was an involute planetary drive and the other was an N-type planetary drive with small teeth difference. The kinematic calculation was conducted based on the analysis of structural composition and working principle. Formulas of backlash calculation for the new planetary gearing were derived by using probabilistic theory and the analytical model was created at the same time. Then, main factors that affect the systematic backlash were introduced and the effects of manufacture error, misaligments and roller bearing parameters on the distribution of backlash were presented. The influence of gear backlash on systematic return difference was performed based on the backlash mathematic model proposed. The results show that the backlash is a little large, of which the backlash of bearing takes a greater part than two gearing stages. So we presented some practical methods to reduce the systematic backlash.  相似文献   

关于Moore-Penrose逆的若干性质     

邵俊倩 《巢湖学院学报》2009,11(6):8-9

给出了Moore-Penrose逆的定义及Moore-Penrose逆的几个特殊性质.  相似文献   

关于强正则环的一些研究     

崔顺 《滁州学院学报》2009,11(2)

利用ZC-环和自-内射环的性质来刻画强正则环.证明了下列结果:1设R是ZC-环,下列条件等价:(1)R是强正则环;(2)R的每一个极大本质左理想是GP-内射的;(3)R中存在一个忠实左R-模K,使得当k∈K且l(k)本质时,l(k)是GP-内射的.2设R是ELT-环,且对于R的每一个本质左理想M,[R/M]R是平坦模,R的每一个补左理想是GW-理想,如果R是左MI-环,那么R是左自-内射强正则环.  相似文献   

罚金刑阻却罪犯自由刑减刑问题的对策研究     

邢娜 《内蒙古大学学报(人文社会科学版)》2009,41(6):35-39

罪犯的减刑问题一直是监狱管理中的一个难题,如何处理监狱与人民法院、监狱与罪犯、监狱与人民检察院的关系,直接关系减刑制度的良好运作。目前监狱管理活动中出现了一个难以解决的新问题即罚金刑不执行法院就不给予罪犯减刑,法院的这种做法挫伤了罪犯改造的积极性,给监狱管理带来了不稳定的因素。应采取相应政策以解决这一问题。  相似文献   

加快环首都绿色经济圈建设研究     

乔敬图 《保定学院学报》2012,25(4):1-5

河北省环首都绿色经济圈建设面临着京津冀区域经济一体化、首都经济圈纳入国家＂十二五＂规划等新的重大历史机遇。系统规划滞后、对外开放滞后、增长模式滞后、城镇化水平滞后是环首都绿色经济圈建设面临的主要问题。没有形成真正意义上的＂京冀联盟＂,是环首都绿色经济圈建设的主要障碍,主要体现在发展理念、体制机制和诉求矛盾等方面的制约。环首都绿色经济圈建设应充分考虑北京正在外溢的产业及人群特点,努力互补而非竞争,实现与北京的全方位对接,把产业隆起、开放开发、特色城镇、生态建设作为环首都绿色经济圈建设的重点,加强区域间的协调联动。  相似文献   

No effect of upper body compression garments in elite flat-water kayakers     

《European Journal of Sport Science》2013,13(4):341-349

Abstract

While the effect of lower body compression garments on performance and physiological responses are well documented, no studies have examined the effect of upper body compression garments (UBCG) on upper-body dominant exercise. This study examined the effects of wearing UBCG on performance and physiological responses during simulated flat-water kayaking. Five male (mean values±s: 21.8±2.8 years; 83.5±9.2 kg; 63.0±5.5 ml·kg^?1·min^?1) and two female (mean values±s: 25.0±4.2 years; 71.4±2.7 kg; 51.0±4.8 ml·kg^-1·min^-1) elite flat-water kayakers completed a six-step incremental test followed by a four-minute maximal performance test (4minPT) in both UBCG and control (no shirt or sports training bra) conditions in a randomized counter-balanced order. Heart rate and oxygen consumption (O₂) as well as performance measures (power, distance covered, stroke rate) were recorded during the tests, and blood lactate was measured immediately after each incremental step and three minutes following the 4minPT. Near-infrared spectroscopy-derived measures of blood flow and oxygenation of the flexor carpi radialis were monitored continuously for all tests. No significant differences between the UBCG and control conditions were evident for any performance, cardiorespiratory or oxygenation measure across the incremental step test and 4minPT. It was concluded that wearing UBCG did not provide any significant physiological or performance benefits during simulated flat-water kayaking.  相似文献   

柔性制造与职业技术教育的对比分析     

陈斌  杨敏  魏庆曜 《成都教育学院学报》2005,19(1):24-26,30

文章在分析柔性制造基本特征的基础之上,归纳提出了柔性制造的柔性特征.通过对柔性制造与职业技术教育的本质比较,论述了二者的可比性并概括了二者的类比要素.最后,文章对二者的各种柔性特征进行了比较分析,得出了柔性制造与现代职业技术教育的相似性结论,为进一步引入柔性制造系统理论来构建基于柔性制造的职业技术教育模式奠定了理论基础.  相似文献   

强π-正则一般环的扩张     

王周  陈建龙 《东南大学学报》2007,23(2):309-312

介绍了强π-正则一般环(未必有单位元)的概念并考虑了它的一些扩张.给出了强π-正则一般环的2个等价刻画,即I是强π-正则一般环当且仅当对于每个x∈I,存在n≥l以及y,z∈I,使得xn=xn 1y=zxn 1当且仅当I中的每个元都是强π-正则的.还考虑了强π-正则一般环上的上三角矩阵一般环和平凡扩张,证明了强π-正则一般环上的上三角矩阵一般环仍是强π-正则的并且其平凡扩张是强clean的.  相似文献   

冠醚化学的发现及发展     

刘刚 《怀化学院学报》1990,(2)

本文简述了冠醚化合物的发现、合成、化学行为以及它们在化学,医学、生物化学中的应用,并介绍了一些新的研究成果。  相似文献