非线性带涂层圆柱形复合介质的电势分布

利用摄动方法,研究了在外加交流电场E=E1sinωt＋E2sin3ωt＋E5sin5ωt的作用下,非线性带涂层圆柱形复合介质的电势分布,这种介质的电流密度J和电场强度E之间满足的关系为Jα=σαE＋χα｜E｜2E。     

关于逆序列的极限空间

讨论了当逆系统为一逆序列时其极限空间的性质，证明了任一逆序列的极限空间与任一无穷的子逆序列的极限空间是同胚的。     

Different psychophysiological responses to a high-intensity repetition session performed alone or in a group by elite middle-distance runners

Abstract

Internal training load refers to the degree of disturbance in psychophysiological homeostasis provoked by a training session and has been traditionally measured through session-RPE, which is the product of the session Rate of Perceived Exertion (RPE) and the duration. External training load refers to the actual physical work completed, and depends on session volume, intensity, frequency and density. Drafting, which is achieved by running closely behind another runner has been demonstrated to reduce the energy cost of running at a fixed speed and to improve performance. Therefore, it is hypothesised that psychophysiological responses might reflect different levels of internal load if training is performed individually or collectively. 16 elite middle-distance runners performed two high-intensity training sessions consisting of 4 repetitions of 500?m separated by 3?min of passive recovery. Sessions were performed individually and collectively. Times for each repetition, RPE, core affect (valence and felt arousal) and blood lactate concentrations [BLa] were measured after each repetition. Main time effect was significant and increased across repetitions for [BLa] and RPE (p?<?0.001), and decreased for valence (p?=?0.001). Main group effect was significant and values were higher when training individually for [BLa] (p?=?0.003) and RPE (p?=?0.001), and lower for valence (p?=?0.001). No differential responses were found between conditions in terms of repeat time or felt arousal. Findings demonstrate that elite middle-distance athletes running collectively display lower levels of internal training load compared to running alone, despite external training load being similar.     

PGA调速器的选配实例

６２６０ＺＣ型柴油机成功地配上了Ｗｏｏｄｗａｒｄ·ＰＧＡ－１２气动液压调速器，这就解决了遥控柴油机的关键问题。笔者概要地介绍了匹配工作的全过程，包括调速器的引进、ＰＧＡ－１２的选配以及调速器的联机试验等。     

多级阻容耦合放大器通频带测试问题探讨

本文针对多级阻容耦合放大器通频带测试中存在的问题,通过分析产生问题的原因提出了改进电路,从而解决了测试存在的问题,取得了预期的效果。     

《潇碧堂集》中和韵诗与限韵诗研究

《潇碧堂集》是袁宏道创作历程中的一个重要过渡,过渡中一个显著的变化就是和韵诗与限韵诗数量较之以前的猛然增加。这两类诗增多,从外部来看,与文人集会和袁自身受白居易、苏轼影响有关;从内部来看,与袁宏道转变后的思想状态相关。袁宏道通过大量创作和韵诗与限韵诗,使得自己的诗艺得以锤炼和提高,《潇碧堂集》整体风格、艺术的完善与此是不可分割的。     

高职学生行为养成现状调查--以长江工程职业技术学院为例

目前高职院校学生行为养成教育值得关注,为摸清基础状况,以问卷调查的方式,针对长江工程职业技术学院土木系师生及部分思政课教师为对象,使用 SPSS社会科学统计软件系统,采取抽样调查,得出了关于高职生行为养成教育的态度认知效果、方式等结果。提出要充分发挥“教、学、管”的全员育人作用,建立有效的学生行为养成教育路径。     

规范与现实之间:道路交通管制制度检视

交通管制作为《道路交通安全法》规定的一种严肃的交通行政行为,其概念被广泛误读;分析该法第39条、第40条和《人民警察法》第15条之规定,有助于对交通管制概念的正确理解;交通管制制度实践运作中的三种乱象背离了法律规定并带来了诸多消极后果。这些表明:交通管制原始概念亟待回归,行政理念尚需更新,行政执法的法律依据适用错误,地方性法规规定违反上位法,交通管制制度的规则有待完善。