女子散打运动员月经周期对训练的影响及调整对策

对12名女子散打运动员的月经情况进行调查研究,以发现其特点.研究结果显示:受试者经期都会有或轻或重的生理和心理不良反应,但是大多数受试者月经周期和持续时间正常,而且只要掌握适宜的运动负荷,绝大多数受试者不会引起运动损伤.针对受试者经期的不良生理和心理反应提出女子散打运动员经期训练的注意事项、方法和训练安排等,为女子散打运动员经期训练提供理论依据.     

立法语篇中权威性的体现

立法语言指规范性法律文本使用的语言。法律规范是由国家制定和认可,并由国家强制力保证实施的最高的行为准则,具有无可置疑的法律效力,因此在语言运用中必须充分显示出法律规范的权威性。以系统功能语言学派德语域理论为基础,从语篇的语言实现形式入手揭示《中华人民共和国宪法》“公民的基本权利和义务”的法律规范蕴涵的法律权威性。     

氧化—还原反应方程式配平的教学探讨

针对现用中等化学教材的内容,对氧化—还原反应方程式配平的教学进行探讨。     

高原耐力训练中抗高原反应能力关系研究

目的:研究通过高原耐力训练,生成体内血胰岛素,并建立起与抗高原反应能力关系模型,评估人体在高原等恶劣环境下训练的生理机能。方法:研究对象为本校篮球队在青藏高原驻训的23名篮球队员,采用SPSS 13.0统计软件,测得运动员体内产生的血胰岛素聚合物Pluronic-b-PCL(Entry 0)和Pluronic-b-P(CL-co-BCL)的显著差异性,从而分析与抗高原反应能力的关系。引入有助于提高抗高原反应的半乳糖分子,通过DLS测试粒子表面的zeta电位值,分析受测运动员的调节纤维激酶值。结果:在阳离子型嵌段共聚物P(PEGMEMA16-co-PEGMA7)-b-PDMAEMA53中N/P比分别为0.3,0.6,0.8,1.5,2.5,3.0,8.0,受测运动员的生成的P(PEGMEMA-co-PEGMA)-b-PDMAEMA为2.155 g,0.1 mmol,PMDETA(104μL,0.5 mmol),Cu Cl(0.0258 g,0.25 mmol),在运动后24 h,血胰岛素与抗高原反应能力相关系数有所增大,运动后48 h,血胰岛素生成与抗高原反应能力相关系数有所较小,同时BP与调节纤维激酶相关系数增大,抗高原反应能力显著提高(P0.05)。结论:通过高原耐力训练,逐步增加红细胞和血红蛋白的生成,促进血胰岛素生成,改善血液输送氧的能力,使新进入高原的人发挥他正常的生理效能,指导高原训练和高原反应病症的治疗和预防。     

Perform kicking with or without jumping: joint coordination and kinetic differences between Taekwondo back kicks and jumping back kicks

We investigated joint coordination differences between Taekwondo back kicks and jumping back kicks, and how jumping (in performing the latter) would alter engaging ground reaction forces (GRF) in executing kicking. Ten skilful athletes volunteered to perform both kinds of kicking within the shortest time for three successful trials. Three high-speed cameras and two force platforms were used for data collection, and the trial with the shortest execution time was selected for analysis. Movements were divided into the rotation and attack phases. With comparable execution time and maximum joint linear/angular speeds, back kicks and jumping back kicks differ mainly in larger GRF in the latter, and in greater target acceleration in the former probably because the support leg prevented athletes’ rebounding after impact. In addition, more prominent antiphase and in-phase coordination between the shoulder segment and knee joint, and elongated rotation phase were found in jumping back kicks. Larger GRF values in jumping back kicks were generated for jump take-off rather than for a more powerful attack. In back kicks although the support leg remained ground contact, greatly decreased GRF in the attack phase suggested that the support leg mainly served as a rotation axis.     

Validation of two accelerometers to determine mechanical loading of physical activities in children

The purpose of this study was to assess the validity of accelerometers using force plates (i.e., ground reaction force (GRF)) during the performance of different tasks of daily physical activity in children. Thirteen children (10.1 (range 5.4–15.7) years, 3 girls) wore two accelerometers (ActiGraph GT3X+ (ACT), GENEA (GEN)) at the hip that provide raw acceleration signals at 100 Hz. Participants completed different tasks (walking, jogging, running, landings from boxes of different height, rope skipping, dancing) on a force plate. GRF was collected for one step per trial (10 trials) for ambulatory movements and for all landings (10 trials), rope skips and dance procedures. Accelerometer outputs as peak loading (g) per activity were averaged. ANOVA, correlation analyses and Bland–Altman plots were computed to determine validity of accelerometers using GRF. There was a main effect of task with increasing acceleration values in tasks with increasing locomotion speed and landing height (P < 0.001). Data from ACT and GEN correlated with GRF (r = 0.90 and 0.89, respectively) and between each other (r = 0.98), but both accelerometers consistently overestimated GRF. The new generation of accelerometer models that allow raw signal detection are reasonably accurate to measure impact loading of bone in children, although they systematically overestimate GRF.     

审美活动中潜在的“基因导向”

人类的审美活动实则带有一定的神秘性。在审美活动中,人们有时会发现自我与他者存在着一些共同的审美倾向,但同时又存在很多不同点。随着生物学的发展,人们逐渐发现基因和审美活动之间存在着一些关联:人们的审美选择会本能地倾向于利于基因自我保存的选项。甚至,有学者认为,审美活动完全是由基因决定的。基因决定论现已被证实是错误的,但不论在审美差异还是共同点,人类潜在的基因确实对人类的审美倾向有一定的导向作用。     

基于“情境化策略”的高职类电视节目制作专业核心课程设置

本文围绕“情境化策略”概念论述高职院校电视节目制作专业如何设置专业核心课程,重点理清了情境化策略在学习领域中的位置,情境化策略和电视节目形态、工作过程、技能知识的关系。     

烧结温度对La1.2Sr1.8Mn2O7结构和磁性的影响

采用溶胶-凝胶法在不同的烧结温度下制备了La1.2Sr1.8Mn2O7多晶样品.磁性测量表明,1 200℃热处理的样品存在3个磁转变温度,且在116 K～365 K温区范围内磁化强度显著高于1 400℃热处理的样品;同时,1 400℃热处理的样品,在整个温区只存在2个磁有序转变温度,并且呈现出类自旋玻璃态.结合这2个样品的结构分析发现,较高温度处理更有利于双层钙钛矿结构的形成.     

“Not like that,not for that,not by them”: social media affordances of critique

This paper has two objectives: to explicate the sociotechnical conditions that facilitate critique on social media platforms (specifically: Tumblr); and to operationalize a “working theory” from Foucault’s conceptualization of critique. We analyze resistant practices observed (in ethnographic study) in a Not Safe For Work (NSFW) community on Tumblr, arguing that the potential for critique arises there at the intersection of platform architecture and use cultures. Specifically, we show how critique emerges from shared practices of ethics, most visibly enacted through what we call voluntary vulnerability and paying it forward. This potential for critique is arguably at risk with Tumblr’s recent NSFW ban.