机械与机电系统中力学量的Saber仿真分析探讨

通过对Saber仿真软件在机械与机电系统中的力学量仿真分析探讨,说明了sabet仿真不仅可以代替许多有关力学实验,而且可以在建立准确模型的基础上对机械及机电混合系统的力学应用和分析发挥作用。     

"云娜"台风暴雨的Q矢量与螺旋度诊断分析

利用非地转ω方程说明了Q矢量散度的物理意义,并通过计算台风“云娜”影响过程中的Q矢量散度和高低空螺旋度,分析了这两个物理量的演变特征及其与台风、台风暴雨的关系,指出低层等压面上Q矢量散度场及相对螺旋度对台风暴雨预报具有较好的参考价值。     

“闭眼投篮”练习方法教学效果探讨

人体的运动技能是在多种感受机能的参与下完成的,在视觉、听觉、位觉、触觉、本体感觉中,本体感觉是运动技术形成的基础。在我院篮球专项班学生在教学中增加“闭眼投篮”的练习,运用“闭眼投篮”练习与传统的投篮教学方法相结合进行教学,有助于迅速掌握投篮基本技术、技巧,建立正确的动力定型,而且能够改善学生的心理品质,克服心理障碍,有利于提高投篮的命中率,是提高篮球教学质量的有效手段。     

1999年全国体操锦标赛男子自由体操比赛浅析

目前在自由体操项目上, 运动员的成套动作出现了 “两多一少”现象, 这是规则导向的结果, 但并非动作发展的必然趋势。我国运动员在完成自由体操动作中, 尚存在着起评分偏低、训练水平欠缺和动作完成准确性等问题, 应予以重视     

含蓄蕴藉的委婉语

委婉语是人类语言中普遍存在而又十分复杂的一种语言现象。委婉语属于社会文化现象,是文明社会的产物。委婉语不仅属于修辞学范畴,还是其他学科如社会语言学、心理学、哲学等的研究对象。委婉语深深植根于一个民族的社会土壤之中,蕴藏着丰富的文化内涵,承载着一个民族的社会结构、民族心理、宗教信仰、价值取向和风俗习惯等因素。委婉语是特定社会和文化的一面忠实的镜子,反映了形形色色的社会价值观和社会心理状态以及与之相应的文化传统。委婉语的生成、发展、转换乃至衰亡都与时代精神息息相关。委婉语的存在体现了意境和社会文化对语言使用的影响和制约,也体现了不同民族对交际方式的要求。     

体育新闻报道畸变现象及产生原因的社会学透析

采用文献资料法、逻辑分析法对体育报道的畸变现象进行了论述:暴力化、色情化、失实报道屡见不鲜、恶炒新闻层出不穷、锦标主义、以成败论英雄的陋习常见、地方沙文主义色彩日益严重等等。并对这些现象产生的原因进行了透析,认为产生这些现象的原因有:媒体从业人员素质的匮乏、市场竞争的日趋激烈、大众文化娱乐性的推波助澜、体育报道远离政治规范孕育畸变土壤等。     

问题与策略:我国省级综合档案馆微信公众号移动服务研究

由于具有互动营销功能,微信可作为档案移动服务平台建设的重要选择之一.本文以《档案移动服务平台建设指南》为依据,采用网络调查法调查了我国省级综合档案馆微信公众号开展档案查询、档案展厅、档案资讯、互动交流等移动服务的现状,在此基础上分析了其中存在的问题,并以部分优秀微信公众号和移动服务平台为例提出了相应的优化策略.     

Fatigue increases ankle sprain risk in badminton players: A biomechanical study

ABSTRACT

Ankle sprains are the most common injury in regular badminton players and usually occur at the end of a match or training. The purpose of the present study was to examine the influence of fatigue produced by badminton practice on the lower limb biomechanics of badminton players. It was hypothesized that fatigue induces ankle kinematic and lower leg muscle activity changes which may increase the risk of ankle sprain. Ankle kinematics, ankle kinetics and muscles activities of 17 regular badminton players were recorded during lateral jumps before and after an intense badminton practice session. Post-fatigue, ankle inversion at foot strike and peak ankle inversion increased (+2.6°, p = 0.003 and +2.5°, p = 0.005, respectively). EMG pre-activation within 100 ms before foot landing significantly decreased after fatigue for soleus (?23.4%, p = 0.031), gastrocnemius lateralis (?12.2%, p = 0.035), gastrocnemius medialis (?23.3%, p = 0.047) and peroneus brevis (?17.4%, p = 0.036). These results demonstrate impaired biomechanics of badminton players when fatigue increases, which may cause a greater risk of experiencing an ankle sprain injury.     

流行美剧的粉文化传播模式研究——以“谢耳朵”现象为例

通过"谢耳朵T恤现象",聚焦流行美剧粉丝在自我身份认知过程中缔造的文化传播模式。经过比较与分析,认为流行美剧的粉文化传播,既脱离不了现实基础,也需要多方合力的促进。     

Mediating effects of resistance training skill competency on health-related fitness and physical activity: the ATLAS cluster randomised controlled trial

The purpose of this study was to examine the mediating effect of resistance training skill competency on percentage of body fat, muscular fitness and physical activity among a sample of adolescent boys participating in a school-based obesity prevention intervention. Participants were 361 adolescent boys taking part in the Active Teen Leaders Avoiding Screen-time (ATLAS) cluster randomised controlled trial: a school-based program targeting the health behaviours of economically disadvantaged adolescent males considered “at-risk” of obesity. Body fat percentage (bioelectrical impedance), muscular fitness (hand grip dynamometry and push-ups), physical activity (accelerometry) and resistance training skill competency were assessed at baseline and post-intervention (i.e., 8 months). Three separate multi-level mediation models were analysed to investigate the potential mediating effects of resistance training skill competency on each of the study outcomes using a product-of-coefficients test. Analyses followed the intention-to-treat principle. The intervention had a significant impact on the resistance training skill competency of the boys, and improvements in skill competency significantly mediated the effect of the intervention on percentage of body fat and the combined muscular fitness score. No significant mediated effects were found for physical activity. Improving resistance training skill competency may be an effective strategy for achieving improvements in body composition and muscular fitness in adolescent boys.