对我国女子铁饼优秀运动员的技术分析

对参加2000年奥运会田径选拔赛的我国6名女子铁饼运动员最佳成绩的一次完整技术作为研究对象，采用爱捷运动录像快速反馈分析系统进行三维运动学分析，选取出手高度、出手速度、出手角度和躯干倾角等运动学指标，结合饼速变化特征和超越器械程度的相关影响因素，对6名运动员进行技术分析，结果表明：运动员出手时，同水平速度相比，垂直速度偏大；应加强以旋转节奏为主的专项练习；肩髋扭转角在左脚着地时达到最大；拉引角最好在左脚着地时为最大。     

浅谈黑龙江方言的语音特点

黑龙江方言在分区上属于北方方言的东北方言。它同以北京语音为标准音的普通话,既有较高的一致性,也有显著的特色。基于此,从声母、韵母、声调、音变这四方面探讨其语音特点,得出方言是我们的根的结论。     

Keyboarding Aids

Abstract

Elementary schools across the United States are striving to find the most effective method of teaching keyboarding to their students. A number of schools make use of sensor-key capson the Dand the Kkeys. These caps have eight elevated dots forming a circle in the center of the cap. Educators would benefit from knowing if, indeed, these key caps make a significant difference in students' abilities to keyboard with increased speed and accuracy when compared to standard keys. This study was conducted on two groups of third-, fourth-, and fifth-grade students (N= 95) who completed a keyboarding unit. One group used the sensor-key caps and the other group did not. Results provided no evidence that the use of sensor-key caps improved keyboarding speed or accuracy over standard keys without the key caps.     

单片机控制的速度测量与报警系统

介绍了基于霍尔效应传感器和利用单片机控制实现速度测量与报警系统的整体设计方案,重点介绍了系统的硬件构成、软件实现、物理思想和工作原理,最后利用本系统进行了实验检测和验证。本测速与报警系统测量准确度高,报警功能灵敏,适合推广应用于所有轮式机动车辆。     

Cognitive foundations of message encoding: An investigation of message production as coalition formation

In this study participants (N=36) generated simple narratives employing a SITUATION ‐ ACTION ‐ BECAUSE structure. On some trials, all three elements of such triads were provided, and in other cases, participants were required to generate ideational links for SITUATION ‐ ACTION pairs. Consistent with the prediction generated from second generation action assembly theory (AAT2), participants were shown to be significantly faster in producing their messages when all three elements of their narratives were provided. The propensity to experience cognitive failures was shown to speed production of messages, particularly when participants were required to generate ideational links. Thus, although propensity to experience cognitive failures is typically seen to involve mental lapses and forgetfulness, this study produced evidence that people high on this trait actually enjoyed a performance advantage. Speed of information processing was not shown to have any impact on the rapidity with which messages were generated. Implications for future research on message production employing the experimental paradigm developed here are discussed     

超声波电机的速度智能控制研究

针对超声波电机参数的时变性、系统内在的非线性和系统的强耦合性等特点,提出基于免疫遗传算法的超声波电机模糊神经网络速度控制策略．实验结果表明,与传统模糊神经网络速度控制相比,采用该方法的系统能较好地实现设定的超声波电机速度参考模型的自适应跟踪,响应速度脉动小,具有控制灵活、适应性强、控制精度高、鲁棒性强等优点．     

《离骚》复音词研究

《离骚》是战国末期的一篇重要韵文,是研究上古汉语词汇的重要语料。我们可从语义、词性角度对《离骚》中的复音词作全面、系统分析。     

高校财务“预算、核算、决算一体化”管理的实践探索

伴随着我同高校投资来源多元化、支出项目多样化以及政府采购等财政管理体制的改革,加上高校财务工作存在的信息流转不畅、效率低下等问题,高校财务需要文行“预算、核算、决算一体化”管理．实施“一体化”管理,能够使高校财务实脱各项目之间的交叉核算,全面反映财务工作情况,建立起事前事中事后一体化的预算执行动态监控机制,促进财务管理的科学化、精细化．“一体化”管理应遵行“责任到人、两条线管理、定期核对”原则．     

普通高校400m跑供能特点及速度与速度耐力训练方法探析

从运动生物化学、运动生理学的角度分析400m跑的能量来源和供能过程,同时揭示了普通高校运动员与世界高水平运动员在速度、速度耐力特征方面存在的差距．结合运动训练理论,提出了采取多样化的训练方法和手段：在优先发展速度素质的基础上,加强速度耐力、力量耐力训练,积极发展运动员的有氧代谢能力;优化训练的过程,使训练效果最佳化．     

理想气体分子平均相对速率公式的推导

运用麦克斯韦速率分布律,推导出理想气体分子平均相对速率与算术平均速率的关系式。