运动性贫血的发生机制与监测   总被引：29，自引：1，他引：28  

张缨  文茹 《北京体育大学学报》2001,24(3):331-334

运动性贫血在体育运动 ,尤其是耐力运动中 ,不仅严重影响运动技能的发挥和成绩的提高 ,而且对身体也十分有害。高血容量反应是运动训练适应性表现 ,不会造成真正意义的贫血 ,而运动训练中红细胞溶血和铁储备状况的监测则是预防运动性贫血的重点。本文以近年来的研究进展 ,就运动性贫血的发生机制做一简述 ,并筛选取血量微、测试简易、灵敏的指标 ,加强运动训练中铁代谢和红细胞溶血等状况的监控 ,将对预防运动性贫血的发生有着十分重要的意义  相似文献   

OPC技术与过程监测系统开发     

叶银忠 《上海海事大学学报》2001,22(3):205-209

OPC是一种连接硬件装置或软件数据库等数据源与过程控制客户应用程序之间的标准化的接口协议,它可以显著地增强过程控制领域中的控制系统、现场设备、管理应用程序之间的互操作性,为实时综合监测系统的开发提供一条高效、可靠的新途径.本文首先论述了过程监测系统开发所面临的一般性问题,强调了实时数据通信问题的重要性,概要介绍了OPC模型的结构与特点,分析了他与传统的Client/Server模型之间的区别,最后介绍了OPC技术在船舶机舱集中监测报警系统开发中的应用.  相似文献   

沙地力学传递特性的实验研究及沙滩排球扣球起跳的动力学特征     

李世明  刘学贞 《北京体育大学学报》2001,24(2):260-263

采用跳深的方法对约 40 cm深沙地的力学传递特性进行实验研究 ,并引入“黑箱”理论进行动力学与动力学数据的对比分析以获得沙地力学传递函数 :力传递函数为 Fd=0 .39Fu1 .1 6 ,冲量传递函数为 Id=0 .88Iu;在此基础上 ,采用录像系统与三维测力台系统实现对沙滩排球扣球起跳阶段的运动学与动力学数据的同步采集 ,揭示其主要动力学特征为沙滩排球扣球起跳的恢复系数小以及其形成的三方面原因 ,以图为沙滩排球的科学化训练提供可靠的理论依据。  相似文献   

近20年来我国技巧运动发展的动态分析   总被引：2，自引：0，他引：2  

许铭  何幸光 《广州体育学院学报》2004,24(3):83-85,114

采用文献资料法、逻辑分析法、归纳演绎及分析综合等方法，对近20年来我国技巧运动重大国际比赛中所处的地位，特别是近几年的发展作了较为详尽的分析，指出了当前世界技巧运动发展的趋势：即以国际技巧规则为导向创新为动力，注重艺术性和成功率。旨在为我国技巧运动的发展提供一线思路。  相似文献   

"多层感官动静结合讲解法"在武术普修课中的实施——将被动的"鸭"变成主动的"人"     

田桂菊 《湖北体育科技》2002,21(2):250-252

教学方法的改革是提高教学质量的重要途径。章以当前教学改革的新目标及现代教学理论的新要求为依据，结合武术自身特点的优势，在教学过程中，提出并实施“多层感官动静结合讲解法”。该法不仅能充分调动学生的积极性和主动性，激发学生的学习兴趣，把学生由过去在课堂上被动的被“填”的“鸭子”变成有思考能力的、有主观能动性的人，同时，极大地提高了学生的专业技能及逻辑思维能力。  相似文献   

Environmentally-induced stone decay: the cumulative effects of crystallization–hydration cycles on a Lincolnshire oopelsparite limestone     

Belinda J. Colston  David S. Watt  Helen L. Munro   《Journal of Cultural Heritage》2001,2(4)

An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay.  相似文献   

优秀运动员齐海峰竞技成绩的灰色关联分析及其模式训练研究     

王麒麟  程晖  张亚平 《吉林体育学院学报》2006,22(2):57-58,62

运用文献资料法和数理统计分析方法，对我国优秀男子十项全能运动齐海峰近几年的比赛成绩进行了综合分析，找出了影响其专项成绩的主要因素，并在此基础上，运用CM（1，N）动态协调模型对其在总成绩不断提高的过程中，系统处于不稳定和非协调发展局势，进行了多方位，多层次的研究，旨在对其成绩的提高起到借鉴作用。  相似文献   

基于Jess规则的数据库通知服务   总被引：1，自引：0，他引：1  

胡勤友施朝健  陈海山危强 《上海海事大学学报》2006,27(1):44-48

提出一种实现数据库通知服务的技术框架,使用Jess规则代替SQL编码来表达用户的数据监控策略,规则执行时先由规则解释器将规则翻译成SQL语句然后执行.使用这种方法,数据监控策略易于理解和接受,修改方便;其次,可在规则解释器中实现异构数据库系统之间的关联通知服务;最后,Jess规则还可以进行复杂的推理,实现通知业务的智能化.  相似文献   

知识管理在提升企业自主创新能力中的作用   总被引：2，自引：1，他引：1  

安新颖  冷伏海 《图书情报工作》2008,52(9):47-47

从知识角度对自主创新的内涵进行界定,阐述了自主创新和知识管理的关系,探讨知识管理个要素对企业自主创新能力的影响。以知识管理为核心,采用系统动力学仿真软件VENSIM构建企业自主创新的系统动力学模型,比较不同知识管理因素对自主创新能力提升的效果,并提出相应的政策建议。  相似文献   

The Concept of Record in Interactive, Experiential and Dynamic Environments: the View of InterPARES*     

Luciana Duranti  Kenneth Thibodeau 《Archival Science》2006,6(1):13-68

This article presents the concept of electronic record as articulated by the first phase of the InterPARES (International research on Permanent Authentic Records in Electronic Systems) Project (1999–2001) and discusses it in light of the findings of the second phase of the Project (2002–2006). While InterPARES 1 focused on records produced and/or maintained in databases and document management systems, InterPARES 2 examined records produced and/or maintained in interactive, experiential and dynamic environments. The authors describe the characteristics of these environments and of the entities found in them in the course of case studies conducted on systems used for carrying out artistic, scientific and e-government activities, and propose the new concept of record that InterPARES 2 is eleborating, which expands on that formulated by InterPARES 1.The authors would like to thank InterPARES 2 research assistant Randy Preston for his careful editing and constructive criticisms. Some of his suggestions have been incorporated in the text of this article.  相似文献