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目的:检验大学生篮球与排球运动员有氧运动能力的差异,对运动员有氧生理指标产生的影响。方法:对受检运动员五项有氧运动能力指标进行统计量比较分析,论证篮球与排球运动员有氧运动能力表现特征。结果:反映有氧运动能力的肺活量、肺活量/体重指数、台阶指数、指标,篮球队均高于排球队。结论:篮球与排球各自的运动特点对有氧能力产生的影响有较大的差异。 相似文献
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目的:通过研究外源性抗氧化剂的补充对运动性疲劳的影响,得出外源性抗氧化剂补充量与运动型疲劳抑制的关系模型,指导训练康复治疗。方法:构建外源性抗氧化剂对运动性疲劳影响的数学关系模型,通过外源性抗氧化剂的补充,分析对过度训练导致运动性疲劳病理观察情况。运动员进行运动性疲劳训练中的外源性抗氧化剂补充统计值,通过分析运动性疲劳承受肌免疫细胞的刊过氧化酶SOD和CAT活性以及生理盐水等指标,进行差异性统计,构建统计模型,观测其差异性特征。结果:通过外源性抗氧化剂补充,计算运动性疲劳抑制指数,能有效对过度运动训练损伤导致的运动性疲劳等并发症实现诊疗。采用该关系模型,肺动脉收缩压有82.6 mm Hg改善为92.0 mm Hg,肺动脉舒张压有44.9 mm Hg改善为50.3 mm Hg,展示了较好的性能。结论:外源性抗氧化剂的补充对运动性疲劳的影响关系模型定量分析准确,通过外源性抗氧化剂补充能有效对运动性疲劳进行抑制治疗,效果较好。 相似文献
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本文通过查阅大量文献对自行车运动的研究有了较为全面的了解,结合运动与健康的关系和中国2008年举办奥运会情势下的全民健身热潮对户外自行车运动作了初步的探讨。研究表明户外自行车运动对人体健康影响作用主要表现在心脏功能、力量素质、肺活量和心理健康等方面,结合我国自行车的丰富资源和户外自行车运动的保健作用提出建议。 相似文献
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目的:研究短跑运动员训练后的疲劳特点及相应恢复方法;方法:文献资料法和专家咨询法;结果与结论:短跑运动疲劳产生的主要原因有能量耗竭、神经疲劳、代谢产物堆积、肌肉的微损伤等几方面,疲劳的恢复手段有:整理活动、按摩、桑那浴、睡眠、营养、药物、心理恢复等几方面。 相似文献
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专利引文由于在科技评价过程中具有十分重要的作用,近年来一直是研究的重点。然而,作为专利引文研究理论基石的专利引文关系形成的影响因素问题并没有得到较好的解决。随着网络分析方法的深入,围绕着专利引文网络结构特征的研究出现了大量的研究成果,这些成果都从某种程度上折射出专利引文关系的形成受到了来自属性特征之外关系特征的影响,而现有的以回归方法为基础的统计推断方法难以将这些因素纳入进分析框架中来。本文借鉴指数随机图建模理论框架,将影响专利引用关系形成的若干因素归纳为网络自组织过程,属性特征影响过程与外部情境影响过程等因素,以PATSTAT风能数据为基础,本文根据不同类型的影响过程分别构建了若干独立的过程模型以及综合模型,通过对不同模型参数估计结果以及拟合优度的比较发现：专利的属性特征对于专利引用关系形成的影响被高估了;而引用关系的自组织过程对于专利引用关系的形成产生了更为重要的影响。该研究结论的发现,为下一步改进专利引用关系形成影响因素问题研究指明了方向。 相似文献
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郭晓兵 《内蒙古科技与经济》2000,(Z1)
疲劳是一种正常的生理现象 ,而在训练中 ,由于机体能量消耗过大 ,代谢产物堆积 ,导致机体运动能力下降则更是一个普遍存在的问题。所谓运动性疲劳 ,即指运动负荷超过机体承受能力而出现的一些组织器官甚至整个机体工作能力暂时下降的现象。众所周知 ,机体疲劳的消除与运动训练的效果有着密切关系 ,没有恢复就没有训练 ,也就没有运动能力的提高 ,而恢复实质就是疲劳的消除。因此 ,训练后疲劳的消除就显得尤为重要。科学有效地消除运动性疲劳应从以下几方面着手 :1 静止性体息——睡眠睡眠是消除疲劳恢复体力的一种重要的、不可缺少的好方式… 相似文献
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《内江科技》2020,(5)
通过文献资料法、实地研究法、访谈法,研究青少年体育培训与中小学学生体力活动的发展关系,研究认为:我国青少年体育培训的发展适应人们社会生活、文化生活的需求,符合青少年体育发展的国策要求;美国对于中小学教育中体力活动给予了极大的关注,肯定了它的作用价值,这也是现在和未来我国中小学教学要坚持的方向;我国在体育教学中对体力活动关注较少,教学实践和理论之间偏差太大,存在很多的问题和不足,中小学学生体质水平下降明显,肥胖率、近视率增加,青少年体育培训相比中小学体育教学有很多优势,能够切实提高学生体力活动水平,发展学生体育运动技术技能,可以成为中小学体育教育的有力补充。 相似文献
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运动性疲劳的产生与运动形式有密切关系。本文采用文献综述法,从不同运动形式的供能特点出发,分析在不同运动形式下,运动性疲劳产生的特征。揭示运动性疲劳与运动形式的关系这对于加快疲劳的消除,提高训练水平有着重要意义。 相似文献
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《科技通报》2015,(12)
提出一种基于多元线性回归分析方法的足球运动员代谢循环机能动态检测模型,构建能反映足球运动代谢循环机能和整体心肺功能的参量评价体系,分别以最大摄氧量、最大无氧功、无氧功递减疲劳系数作为自变量,其它机能评价指标为应变量,构建多元线性回归方程,通过差异显著相关性评价,分析足球运动中代谢循环机能,实现对运动员的绝对力量、速度力量和力量耐力的综合评价,得到足球运动员有氧代谢能力和无氧代谢能力的内在关系。测试结果表明,该模型能有效检测足球运动中代谢循环机能,检测算法具有收敛性和稳定性,基于分析结果开展针对性训练,提高足球运动的有氧能力和无氧能力,为指导足球训练和提高运动员训练水平提供理论基础。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献