国民体质提高趋势的联系数分析

应用联系数研究2000年浙江省国民体质调查统计数据.发现3～6岁幼儿的体质提高趋势要好于成人和老年人;城市和农村人群的体质提高趋势相同,男女人群的体质提高趋势相同,不同工作性质的人群体质提高趋势和不同地市的人群体质提高趋势不同;20～39岁年龄段的人群体质提高趋势为最差.     

Connecting to nature at the zoo: implications for responding to climate change

Societal response to climate change has been inadequate. A perception that the issue is both physically and temporally remote may reduce concern; concern may also be affected by the political polarization surrounding the issue in the USA. A feeling of connection to nature or to animals may increase personal relevance, and a supportive social context may counteract political tensions. Zoos may provide opportunities for both sense of connection and social support. We surveyed over 7000 zoo and aquarium visitors to examine the ways in which a feeling of personal connection among zoo visitors may encourage concern about climate change. Results show that feeling connected to animals at the zoo is significantly associated with cognitive and emotional responses to climate change, as well as with other social groupings and social responses. Overall, the zoo seems to present a supportive social context for considering the topic.     

基于电流型多电平变流器的单相光伏并网系统

采用单相电流型多电平变流器作为光伏并网发电系统的电路接口,可以降低开关器件的开关频率和电流应力,同时可以使电网侧电流获得更好的谐波特性。为获取更好的谐波性能,电流型多电平逆变器部分采用POD-PWM调制,并通过直流侧电流反馈实现分流电感电流的均衡控制。最后,通过锁相环控制,使多电平逆变器输出的电流跟踪电网电压,实现并网。基于PSIM仿真环境,设计了单相五电平电流型光伏并网逆变系统,对上述方案的正确性和可行性进行了验证。     

高校与中学的思想政治教育衔接问题研究

高校与中学在思想政治教育的衔接过程中存在着一些认知偏差、结构颠倒的问题,导致两个阶段的思想政治教育不能无缝对接,以及教育对象在恩想上的混乱。梳理分析高校和中学思想政治教育的衔接问题,意在提高思想政治教育的有效性,优化思想政治教育的结构,更好地实现思想政治教育的目标。     

语音教学与其他英语课教学的联系与渗透

仔细探讨语音教学与其他英语课教学的联系,可以发现重视语音教学及学好语音的重要性.很好地掌握语音,不但有利于正确地从声音方面表达思想,而且也有利于语法学习、记忆单词和提高听力,提高实际运用语言的能力.学好外语语音是学好外语的前提,也是重要的一步.     

运算放大器工作状态的判断及分析

在电子技术教学中,分析运算放大器系统时,应根据运算放大器系统的反馈情况,判断它的工作状态;分析工作状态时,要充分考虑运放系统是处于线性区还是饱和区。线性区可按虚短或虚地原则处理,饱和时不能按虚短原则处理,应用“虚短”和“虚地”时应注意“虚短”是“虚地”的特殊形式。     

中、高等职业教育衔接模式研究

中、高职间的衔接已成为制约构建职业技术教育体系的问题之一，本就中、高职衔接的模式问题做了一些探讨。     

古典式摔跤跪撑技术的趋向

对 2 0 0 0年全国古典式摔跤锦标赛跪撑技术进行统计 ,分析古典式摔跤跪撑技术的发展趋向 ,结果显示 :使用跪撑技术成功与否是获得古典式摔跤比赛胜利的关键 ,而在跪撑技术的使用中又侧重于滚桥和提抱这两种跪撑技术动作。     

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.     

不同篮球鞋足底压力的差异性研究

探讨3种篮球鞋在不同速度下的足底压力分布特征,为指导业余体育爱好者和专业运动员选择适合的篮球鞋和健康运动提供科学、可靠的参考依据。采用德国Novel公司的Pedar鞋垫式(in-sole)足底压力测量系统,对6名篮球专业的大学生穿着不同品牌的篮球鞋(NIKE FLIGHT96、ADIDAS TSPROMODEL和ANTA"霸道"三代)在步行(1m.s-1)、慢跑(1.5m.s-1)和中速跑(2m.s-1)3个速度下进行足底压力测试。结果发现:在3种速度下的整足和分区的最大地面反作用力、最大足底压强、均值足底压强和力量—时间积分值这4个参数显示有差异或显著性差异。结论为不同篮球鞋在足弓区和足跟区的差异较大,适合不同类型的专业运动员和业余篮球爱好者。