对全民健身战略背景下健身走运动推广的必要性研究     

张杰 《体育科技文献通报》2020,(4):159-160

本文以户外健身走运动为研究对象,运用文献资料法、访谈法、问卷调查法、数理统计法等方法,以全民健身为背景研究健身走运动的起源、发展、特征、价值、意义、注意事项以及发展存在的困境,进而对我国健身走运动的发展前景进行展望,为参与者提供科学锻炼的理论依据。  相似文献   

Can a non-Muslim Mass Shooter be a “Terrorist”?: A Comparative Content Analysis of the Las Vegas and Orlando Shootings     

Mohamad Hamas Elmasry  Mohammed el-Nawawy 《Journalism Practice》2020,14(7):863-879

ABSTRACT

This study used the 2017 Las Vegas and 2016 Orlando mass shootings as case studies to explore alleged double standards in reporting of events featuring Muslim and non-Muslim mass perpetrators of violence. The study used framing theory and content analysis to examine Los Angeles Times and New York Times coverage of the shootings during the one week immediately following each event. Findings are consistent with previous literature and the researchers’ expectations. The Orlando shooting, carried out by a Muslim, was allotted more coverage despite the fact that it produced nine fewer fatalities than the Las Vegas shooting, perpetrated by a white non-Muslim. The analysis also showed that the examined newspapers were more likely to employ a “terrorism” frame in their coverage of the Orlando shooting than in their coverage of the Las Vegas shooting; link the Orlando mass shooting with the global war on terrorism; and to humanize Stephen Paddock, the white perpetrator of the Las Vegas shooting. Framing differences found in this study may contribute to downplaying the threat of white male gun violence, and to reinforcing fears of Islam and Muslims.  相似文献   

The biomechanical characteristics of high-performance endurance running     

Stephen J. Preece  Christopher Bramah  Duncan Mason 《European Journal of Sport Science》2019,19(6):784-792

The biomechanical profile of high-level endurance runners may represent a useful model that could be used for developing training programmes designed to improve running style. This study, therefore, sought to compare the biomechanical characteristics of high-performance and recreational runners. Kinematic and kinetic measurements were taken during overground running from a cohort of 14 high-performance (8 male) and 14 recreational (8 male) runners, at four speeds ranging from 3.3 to 5.6?m?s^?1. Two-way ANOVA analysis was then used to explore group and speed effects and principal component analysis used to explore the interdependence of the tested variables. The data showed the high-performance runners to have a gait style characterised by an increased vertical velocity of the centre of mass and a flight time that was 11% longer than the recreational group. The high-performance group were also observed to adopt a forefoot strike pattern, to contact the ground with their foot closer to their body and to have a larger ankle moment. Importantly, although observed group differences were mostly independent of speed, the tested variables showed a high degree of interdependence suggesting an underlying unitary phenomenon. This is the first study to compare high-performance and recreational runners across a full range of kinematic and kinetic variables. The results suggest that high-performance runners maintain stride length with a prolonged aerial phase, rather than by landing with a more extended knee. These findings motivate future intervention studies that should investigate whether recreational runners could benefit from instruction to decrease shank inclination at foot contact.  相似文献   

以社区为驱动力实现全民健康的研究     

胡振飞  曾凡鑫 《体育科技文献通报》2020,(6):115-116,127

以社区为驱动力实现全民健康的研究是一条社区推动全面小康之路,最终目的是解决国民健康面临的现实困境,促进健康中国战略的实施。文章通过文献资料法、逻辑分析法等研究方法,从社区对全民健康计划实施的意义着手,较为全面、系统的分析了社区在全民健康目标实现过程中的作用、价值及内在联系,并提出:以卫生服务管理为突破口,构建新型卫生健康管理服务模式;以社区为单位,提升国民健康素养水平;以环境治理为基点,优化社区环境质量;以国家战略为引领,发展社区健康产业等路径,助推全民健康目标的实现进度。  相似文献   

Body composition differences by age and playing standard in male rugby union and rugby league: A systematic review and meta-analysis     

Tom Geeson-Brown  Ben Jones  Kevin Till  Sarah Chantler  Kevin Deighton 《Journal of sports sciences》2020,38(19):2161-2176

ABSTRACT

This systematic review and meta-analysis aimed to determine differences in body compositionn between playing standard and age in male rugby union and rugby league athletes. The MOOSE (Meta-analysis of Observational Studies in Epidemiology) guidelines for design, implementation, and reporting were followed. Studies were required to be in male rugby union or league and have body composition as the primary or secondary outcome. Data was required to be presented separately for positional groups and body composition presented as whole-body. A systematic search was performed in PubMed, Cochrane Library, MEDLINE, SPORTDiscus, and CINHAHL via EBSCOhost. 57 studies were included for meta-analysis. Results highlighted significantly higher fat-free mass in senior elite than senior sub-elite or junior elite athletes for all RU and RL forwards. Small and non-significant differences were found in fat mass between rugby union playing standards and age categories. Rugby league senior elite forwards had less fat mass than junior elite forwards. Practitioners should prioritise training and nutritional strategies that maximise fat-free mass development, especially in junior elite cohorts.  相似文献   

从传递信息到营造体验:体育传播产品转型初探——基于传播游戏理论的考察     

付晓静  潘陈青  罗幽诗 《武汉体育学院学报》2020,54(2):11-17

传播游戏理论强调传播作为一种主观性游戏的存在，体育传播与此具有天然的契合点。该文在界定体育传播产品内涵、分析传播游戏理论观点的基础上，提出体育传播产品要从传递信息走向营造体验，要开发体育视频资源，利用VR技术增强赛事体验，借助机器人提升体育信息传播速度，采用数据可视化增强体育传播的趣味性与观赏性。  相似文献   

基于战略生态位管理理论的众创空间五元评价模型构建     

罗嘉文  陈晓雪 《科技管理研究》2020,40(14):99-106

众创空间作为开放式创新生态系统,具有多主体、多要素、多功能的特点,需要依托行之有效的评价指标体系推动技术创新培育、监督规范管理行为、优化众创空间效率,为产学研深度融合提供有力支撑。目前,以战略生态位管理理论为核心的众创空间管理评价体系仍有待完善,特别是在众创空间的具体功能定位差异、成员准入规则设计、创业要素互构作用、评价指标建模细节等均缺乏实证探析。结合技术创新发展的自身特点,立足调研数据,通过对众创空间主体、客体及环境等要素的梳理,着重挑选与分析和众创空间功能发挥息息相关的预期、网络、学习、市场培育与市场保护因素,运用德尔菲法确定各项指标权重,应用多层次模糊综合评定法阶梯式递进评价,构建完善"投入-产出"三形态两阶段模型,并以广东省众创空间为实例检验评价效果。结论证明,通过加强创业前景规划、规范空间运行、优化革新技术服务、优化市场孵化服务、增强创业市场产出,可有效提升众创空间的实际运行效能。  相似文献   

Two direct Tustin discretization methods for fractional-order differentiator/integrator   总被引：1，自引：0，他引：1  

Blas M. Vinagre  Ivo Petráš 《Journal of The Franklin Institute》2003,340(5):349-362

This paper deals with fractional calculus and its approximate discretization. Two direct discretization methods useful in control and digital filtering are presented for discretizing the fractional-order differentiator or integrator. Detailed mathematical formulae and tables are given. An illustrative example is presented to show the practically usefulness of the two proposed discretization schemes. Comparative remarks between the two methods are also given.  相似文献   

新疆库车凹陷侏罗系多粒级黏土矿物分析方法及其对沉积-成岩环境的指示     

吴朝东  王琪琪冯雪 顾萧 《中国科技期刊研究》2007,23(7):1655-1663

本文选取库车坳陷侏罗系阿合组—齐古组的碎屑岩样品，利用Stokes原理，通过同步跟进与离心分析相结合的多粒级提取的方式提取不同粒径的黏土矿物，包括〉20μm；20μm～5μm；5μm～2μm；2μm～0．2μm和〈0．2μm。不同粒径组分的黏土矿物呈现出不同的型貌特征，在20～2μm范围内的样品中，自生黏土矿物少见，大量可见碎屑来源的黏土矿物，由于经过了长期的机械搬运，难见完整的晶型。在〈2μm的样品中大量存在自生黏土矿物，大量成集合体，同时也存在碎屑蚀变成因的黏土矿物。通过XRD方法定量分析了所分离出的不同粒径黏土矿物的相对含量，黏土粒径范围内的黏土矿物相对含量呈现些规律变化。碎屑伊利石含量有随着粒级的减小而减少的趋势，而自生伊利石和伊蒙混层只在2～0．2μm及0，2μm以下粒级才出现，并且集中在0．2μm以下粒级范围内；在古气候，沉积环境和母岩特性及分布基本一致的情况下，高岭石的分布有随着岩性的变粗呈现升高的趋势，而伊利石呈负相关关系。碎屑岩中黏土矿物的形貌特征表明，黏土矿物有陆源碎屑来源与自生两种成因，应用Decoform软件对0．2μm以下黏土矿物中不同成因的伊利石进行了计算，并就存在的比例与粒径的关系进行了讨论。黏土矿物组合揭示侏罗纪沉积环境由酸性环境向微碱性环境过渡，早侏罗世和中侏罗世早期为气候潮湿时期，高岭石的含量明显高于侏罗世晚期地层，恰克马克期到齐古期高岭石含量开始出现减小的趋势。从恰克马克期开始，气候缓慢向干旱变化，高龄石含量降低，而伊利石的平均含量明显增加，反映黏土矿物组合主要受沉积环境和成岩作用共同影响。  相似文献   

考虑管间液滴形成和下落过程的吸收器模拟及分析     

王照亮  唐大伟 《中国科学院研究生院学报》2006,23(4):457-464

针对以溴化锂水溶液为工质的水平管吸收器，考虑管底部液滴形成和管间下落过程，建立了描述管间滴状形成和下落吸收过程传热传质耦合数学模型。根据数值计算结果，分析了溶液温度、浓度和吸收速率沿管排不同位置和水平管管间的变化，分析了管间距对吸收器整体传热传质性能的影响。结果表明，滴状吸收过程约占总吸收量的30%。与实验数据的对比说明提出的数学模型是合理的。  相似文献