大学生迷恋网络问题的调查

对某高校因不及格学分达标而受试读、退学处理的学生的调查表明,大多数受处理的学生是因为迷恋网络所致。调查发现了迷恋网络大学生的专业特征、地域特征、性别特征和心理特征,以及由于迷恋网络而诱发的各种伦理道德问题。为此,高校应加强辅导员、班主任和宿舍管理工作,整顿治理校园环境和周边环境;利用网络平台,对大学生开展成才教育和心理辅导等,使大学生尽快走出迷恋网络的误区。     

英语广告双关语的运用技巧及其语用分析

双关作为一种有效的修辞手段,备受广告撰稿人的青睐.本文从谐音双关、语义双关、内涵双关及语法双关等几方面概述了广告双关语的运用技巧,并从语用学角度对广告双关语的合理使用进行了分析.     

认知视角下的英语矛盾修饰法

作为一种形象而又生动的修辞方式,英语矛盾修饰法被广泛应用于文学作品及日常言语中.英语矛盾修饰法由两个互相矛盾的词或词组组合在一起,体现出夸张、幽默等强烈感情色彩.然而,心理语言学家们认为,矛盾修饰法不仅是一种普通的修辞格,还是一种认知机制.人们对矛盾修饰的理解体现出一定的认知过程.     

A review of tennis racket performance parameters

The application of advanced engineering to tennis racket design has influenced the nature of the sport. As a result, the International Tennis Federation has established rules to limit performance, with the aim of protecting the nature of the game. This paper illustrates how changes to the racket affect the player-racket system. The review integrates engineering and biomechanical issues related to tennis racket performance, covering the biomechanical characteristics of tennis strokes, tennis racket performance, the effect of racket parameters on ball rebound and biomechanical interactions. Racket properties influence the rebound of the ball. Ball rebound speed increases with frame stiffness and as string tension decreases. Reducing inter-string contacting forces increases rebound topspin. Historical trends and predictive modelling indicate swingweights of around 0.030–0.035 kg/m² are best for high ball speed and accuracy. To fully understand the effect of their design changes, engineers should use impact conditions in their experiments, or models, which reflect those of actual tennis strokes. Sports engineers, therefore, benefit from working closely with biomechanists to ensure realistic impact conditions.     

Synchronized lower limb kinematics with pelvis orientation achieves the non-rotational shot

A non-rotational (NR) shot is now a well-known scoring move in soccer. To execute the NR shot, it is necessary to deprive the ball of any rotational forces during the impact phase. To execute the NR shot, it is natural that the force vector acting from the foot would pass through the ball’s center of gravity; however, the coordinated motion of the lower limb joint’s angular displacement and the pelvis is still unclear. The aim of this study is to estimate the coordinated leg and pelvis motion during the NR shot as compared to that during instep kicking. Four right-leg dominant college league players were asked to perform a NR shot and an instep kick a total of 10 times each. Hip, knee, and ankle joint angular displacements in the sagittal plane and pelvis yaw and roll rotational motions during both types of kicks were calculated with 14 IR reflective markers using a 3D real-time motion analysis system with a 250-Hz sampling. The Euclidean distances of the joint space of the NR shot and the instep kick were also calculated to detect similarities in the coordinated motion of the lower limb. The results showed that the lower limb joint motions in the sagittal plane were not different; however, the pelvis roll and yaw motions were apparently different, and these phenomena could simulate a pendulum motion with changes in both the vertical and horizontal displacements. These results suggest that the coordinated motion of the lower limb joint’s angular displacement shows high similarity between the NR shot and the instep kick, and the pelvis roll and yaw synchronized orientation is essential for achieving the NR shot.     

乙烯式卤代烃亲核取代历程讨论

乙烯式卤代烃难发生亲核取代反应,反应历程研究受到限制.在双键碳中引入超离去基,反应顺利进行,且立体构型发生反转,证明该反应为SN2历程.     

基于语义Web的教育资源模型相关技术研究

针对E-learning(电子学习)系统中实现教育资源智能搜索与整合的要求,对建立一个基于语义Web技术的教育资源语义模型涉及到的一些技术进行了分析研究。介绍了语义Web的体系结构,针对目前E-learning中存在的问题提出了相应的解决方案。     

八股文文体研究

废除八股取士百年以来,对于八股研究,学界普遍存在着重影响重文风,轻文体的做法。同时,对于八股文的认识也存在着全盘否定,一棍子打死的做法。将八股文与八股气、八股文化混为一谈。本文在回顾以往研究成果的基础上,以文体为切入点,分析八股文文体方面的特征及成就。     

论地方戏曲融入高校教育的重要性

在高校教育中融入地方传统戏曲的内容,从小处看,是丰富了音乐学科的内容,提高学生的人文素养,从大处看,则对于保护非物质文化遗产,弘扬地方文化,发展地方经济,具有广阔的时代背景和深远的战略意义.     

让我们来认识IPv4和IPv6

说起Internet每个人都不陌生，只要你玩过QQ或发过E-mail，那你已经接触到了Internet，给我们带来的方便和快捷。我们畅游Internet的时候，要遵守IP协议规则。就像我们每个人出门要遵守交通规则一样。章向大家简单介绍IPv4和IPv6的产生及发展的历程。