试析我国优秀女子足球队的进攻情况

通过对第9届全国运动会女足第二阶段决赛中进攻情况的统计与分析，及与第8届全国运动会女足比赛相关数据的对比，结果表明：九运会女足比赛进攻失误的主要原因是传、接球失误，与八运会女足比赛的统计结果基本相同。说明加强传、接球训练仍是当前提高我国优秀女子足球队进攻质量的关键环节。     

论排球正面传球的专门化知觉及其培养策略

通过对专门知觉定义的探讨和界定，以逻辑推演的方法推导出排球正面传球的专门化知觉的定义及其组成要素，据此提出排球正面传球专门化知觉的培养策略，以期推动排球教学理论与实践的发展。     

On Natural Variation in Grades in Higher Education,and Its Implications for Assessing Effectiveness of Educational Innovations

To investigate the effect of innovations in the teaching–learning environment, researchers often compare study results from different cohorts across years. However, variance in scores can be attributed to both random fluctuation and systematic changes due to the innovation, complicating cohort comparisons. In the present study, we illustrate how using information about the variation in course grades over time can help researchers and practitioners better compare the grades and pass rates of different cohorts of students. To this end, all 375,093 grades from all 40,087 first‐year students at a Dutch university during a period of six consecutive years were examined. Overall, about 17% of the variation in grades could be attributed to random variation between years and courses. With respect to passing courses, this percentage was almost 40%. Nonsignificant improvements in grades could be flagged as highly significant when this is ignored, thus leading to an overrepresentation of significant effects in educational literature. As a consequence, too many educational innovations are claimed to be effective.     

Predicting volleyball serve-reception at group level

In a group-serve-reception task, how does serve-reception become effective? We addressed “who” receives/passes the ball, what task-related variables predict action mode selection and whether the action mode selected was associated with reception efficacy. In 182 serve-receptions we tracked the ball and the receivers’ heads with two video-cameras to generate 3D world-coordinates reconstructions. We defined receivers’ reception-areas based on Voronoi diagrams (VD). Our analyses of the data showed that this approach was accurate in describing “who” receives the serve in 95.05% of the times. To predict action mode selection, we used variables related to: serve kinematics, receiver’s movement and on-court positioning, the relation between receiver and his closest partner, and interactions between receiver-ball and receiver-target. Serve’s higher initial velocities together with higher maximum height, as well as smaller longitudinal distances between receiver and target increased the chances for the use of the overhand pass. Conversely, decreasing alignment of the receiver with the ball and the target increased the chances of using the underhand-lateral pass. Finally, the use of the underhand-lateral pass was associated with lower quality receptions. Behavioural variability’s relevance for serve-reception training is discussed.     

数字低通滤波器的运算分析

针对数字信号处理的特点,以数字低通滤波器为例,分析了信号经过系统在时域卷积运算和频域乘积运算的数学过程。     

论网络消极口碑传播心理影响因素

随着网络技术的迅速发展,网民数量的激增,网络舆论已成为一股不可忽视的力量。网络舆论中的消极口碑的传播变得更快和更具有影响力,对网络消极口碑的传播进行研究也显得越来越重要。文章分析了网络消极口碑传播国内外的研究现状,并提出影响网络消极口碑传播的八大心理因素。     

用计算机实现二极管包络检波的仿真实验

利用最新电子仿真软件Multisim10进行二极管包络检波虚拟实验,具有组建电路快捷、波形生动直观、实验效果理想等优点。计算机虚拟仿真作为高频电子线路实验的辅助手段,是一种很好的选择,可以加深学生对一些抽象枯燥理论的理解,从而达到提高高频电子线路课程教学质量的目的。     

关于第十六届世界杯各队横、回传球使用情况的研究

对第十六届世界杯足球赛各参赛队使用横、回传情况分析和研究,探索它在对掌握控球权、控制比赛节奏,在进攻时避开对方的紧逼围抢、吸引对方后场防守兵力、破密集防守以及在防守时延缓、瓦解对方攻势、减轻后防压力等方面所起到的作用和所具有的价值。为更好地进攻打下一定的坚实基础,为我国足球的教学训练提供一定的参考依据。     

开放大学在终身学习立交桥建设中的生态学视角

《纲要》明确提出＂要加快发展继续教育,搭建终身学习立交桥＂的战略任务,这对于开放大学的建设者无疑是一个全新的命题。本文从生态学视角描述了立交桥的架构和多元性特征,明确了开放大学在立交桥建设中的地位与作用,阐述了开放大学在终身学习立交桥建设中适应外部环境选择适宜生态位,抢抓机遇优化内部环境,整合教育资源实现与外部环境联通的建设性观点。     

一类包含P（x）-Laplace算子的偏微分方程解的存在性

研究变指数Sobolev空间中一类包含P（x）-Laplace算子的非线性问题.利用变指数Lebesgue和Sobolev空间理论框架,验证Palais-Smale紧性条件,并结合山路定理和变分法证明方程弱解的存在性.