运动员竞技子能力非同步性发展的致因解析

对导致运动员竞技子能力非同步性发展的原因进行了分析后认为:运动员竞技子能力的非同步性发展,是遗传效应、训练效应、比赛效应和生活效应综合影响的结果;从因果关系上看,遗传效应是内因,训练效应、比赛效应和生活效应是外因。同时对影响运动员竞技子能力非同步性发展的因素进行了重要程度的排序。     

异步电机定子绕组状态监测与故障诊断方法

定子绕组故障是异步电动机在运行过程中出现的主要故障,为了保障电动机的安全运行,对异步电动机进行状态监测与早期诊断是很有必要的。关于异步电动机定子绕组状态监测与故障诊断的方法,主要分为两类：第一类是基于模型的故障识别方法;第二类是基于信号检测的诊断方法。     

SAPSO-BP算法在异步电机故障诊断中的应用

为了提高异步电机故障诊断的准确性,引入了一种基于模拟退火粒子群算法优化BP神经网络(SAPSO-BP算法)的故障诊断方法.根据电机转子振动频谱中所提取的特征参数与故障类型之间的关系数据,利用模拟退火粒子群算法来优化BP神经网络的权、阈值参数,再由优化好的BP网络进行故障诊断.实验结果表明,该方法具有较好的故障模式的识别效果,明显提高了异步电机故障诊断的准确性.     

A retrospective look at replacing face‐to‐face embryology instruction with online lectures in a human anatomy course

Embryology is integrated into the Clinically Oriented Anatomy course at the Texas Tech University Health Sciences Center School of Medicine. Before 2008, the same instructor presented embryology in 13 face‐to‐face lectures distributed by organ systems throughout the course. For the 2008 and 2009 offerings of the course, a hybrid embryology instruction model with four face‐to‐face classes that supplemented online recorded lectures was used. One instructor delivered the lectures face‐to‐face in 2007 and by online videos in 2008–2009, while a second instructor provided the supplemental face‐to‐face classes in 2008–2009. The same embryology learning objectives and selected examination questions were used for each of the three years. This allowed direct comparison of learning outcomes, as measured by examination performance, for students receiving only face‐to‐face embryology instruction versus the hybrid approach. Comparison of the face‐to‐face lectures to the hybrid approach showed no difference in overall class performance on embryology questions that were used all three years. Moreover, there was no differential effect of the delivery method on the examination scores for bottom quartile students. Students completed an end‐of‐course survey to assess their opinions. They rated the two forms of delivery similarly on a six‐point Likert scale and reported that face‐to‐face lectures have the advantage of allowing them to interact with the instructor, whereas online lectures could be paused, replayed, and viewed at any time. These experiences suggest the need for well‐designed prospective studies to determine whether online lectures can be used to enhance the efficacy of embryology instruction. Anat Sci Educ 7: 234–241. © 2013 American Association of Anatomists.     

带有不确定性的异步中立时滞系统的鲁棒镇定

研究一类基于异步切换的带有不确定性的中立时滞系统的鲁棒控制镇定问题．通过构造不同的Lyapunov泛函,基于平均驻留时间得到了闭环系统指数稳定的的充分条件,然后给出系统鲁棒镇定的控制器设计方法。     

具有有向切换拓扑结构的二阶多智能体系统的领导随从一致

该文旨在研究具有非线性动力学特征和时变耦合时滞的二阶多智能体系统的领导随从一致性问题,所研究的系统具有切换的拓扑结构.基于Lyapunov泛函理论和线性矩阵不等式的方法,本文给出了一类领导随从一致的充分性条件,并通过具体实例验证所给判据的有效性.     

鼠笼转子异步电动机等值电路参数的测定

利用异步电机在空载、短路和负载情况下测得的等值电路、等值电阻和等值电抗,可以得到电机等值电路的六个参数,此方法既可用于三相异步电机,也可用于单向异步电动机。     

交流异步电动机加载试验台的研制及应用

电动机是煤矿安全生产中的重要设备,其性能直接影响煤矿设备的正常运转,电动机使用前需要进行性能测试。交流异步电动机加载试验台实验项目包括绕组绝缘电阻测定、空载检查、分级载荷试验、超载试验等。所设计的交流异步电动机加载试验台能够为矿用电动机的性能提供精确的参考数据。     

具有多变时滞的多智能体复杂动态网络的平均一致性

研究了具有多变时滞的多智能体无向网络的平均一致性问题.在稳定性分析中,应用线性矩阵不等式（LMI）的方法,得到了多智能体无向多时滞网络的一致性收敛的充分条件.最后,仿真示例对理论结果进行了验证.     

翻译审美批评模式初探

依据一定的模式进行翻译批评,是审美批评主体进行沟通、交流、论辩,最后通向批评共识的必要途径。不同层次的翻译批评侧重点不同,因而需要不同的批评模式。许渊冲模式在翻译审美批评实践中的应用实例阐明,该模式作为翻译审美批评模式具有可行性。