中国高技能人才开发

高技能人才是劳动力结构中居于决策管理层和操作执行层之间的中间层的称谓。在经济发展过程中，这个承上启下的高技能群体广泛包含了技术型技能、知识型技能和复合型技能的人才。在社会经济活动中开始发挥越来越重要的作用，成为社会生产的主力，社会财富的依托，社会稳定的中坚。中国面临高技能人才严重短缺的形势，推动高技能人才群体发展．是当前中国人才资源开发战略的一项重要任务。     

略论梁启超历史进化论及其动力因

梁启超认为历史是“进化”的，它具有进步性和曲折性，呈无极限之螺旋状而非直线上升。历史“进化”之动力因多种多样，其中最主要的是“革”和“力”。梁的历史进化论，激励着当时中国人救亡保种的斗争活动，具有重要的时代意义。     

论叙事张力——从“孤军八百”事件说起

因为时间的不可逆,任何事件的表现形式都是唯一的,因而传统的历史文本就被认为是这一唯一呈现形式的复制品,并对它产生了毫无戒心的心理依赖,也就是认为历史文本是已发生事件的镜像,是真实的。然而,新历史主义认为,事件是真实的,但经过叙事者＂加工＂后呈现的叙事文本却与文学文本一样是想象的产物。所以,同一历史事件,不同的叙事者因为视角、立场等的约制而呈现出不同的形态,叙事在此表现出强大的张力。     

在用汽车罐车安全阀低压状态泄漏原因分析及解决办法

一般情况下安装了安全附件的压力容器,进行泄漏性试验合格后,按照常理也应该是遵循高压不泄漏、低压也不泄漏的原则,但通过实践发现带安全附件的汽车罐车气密试验后高压状态不泄漏,在低压状态却发生泄漏。通过描述在用汽车罐车安全阀在低压状态下泄露现象,分析了问题产生的原因,给出了解决问题的方法,实践证明,该方法效果明显。     

弯曲内力计算的多种方法

弯曲内力计算的一般方法是截面法,本文给出了另外几种计算方法。这几种方法的特点是不需要先计算支座约束反力,而是由荷载直接计算出梁的内力。     

情感取向:和谐社会的一个重要特征

情感与社会因素相联系，具有社会性和历史性的特征，构建社会主义和谐社会，离不开对情感取向的培养与引导，应正确理解情感在构建和谐社会中的动力作用，同时也要看到情感也是和谐社会的一个价值尺度。     

导出反平方力场中质点运动轨迹方程的一种简易方法

本文介绍了偏心率矢量R(也称Runge-lenz矢量)以及利用矢量R导出反平方有心力场中质点运动轨迹方程的方法,并讨论了有关的问题。     

The kinematic differences between off-spin and leg-spin bowling in cricket

Spin bowling is generally coached using a standard technical framework, but this practice has not been based upon a comparative biomechanical analysis of leg-spin and off-spin bowling. This study analysed the three-dimensional (3D) kinematics of 23 off-spin and 20 leg-spin bowlers using a Cortex motion analysis system to identify how aspects of the respective techniques differed. A multivariate ANOVA found that certain data tended to validate some of the stated differences in the coaching literature. Off-spin bowlers had a significantly shorter stride length (p = 0.006) and spin rate (p = 0.001), but a greater release height than leg-spinners (p = 0.007). In addition, a number of other kinematic differences were identified that were not previously documented in coaching literature. These included a larger rear knee flexion (p = 0.007), faster approach speed (p < 0.001), and flexing elbow action during the arm acceleration compared with an extension action used by most of the off-spin bowlers. Off-spin and leg-spin bowlers also deviated from the standard coaching model for the shoulder alignment, front knee angle at release, and forearm mechanics. This study suggests that off-spin and leg-spin are distinct bowling techniques, supporting the development of two different coaching models in spin bowling.     

我国区际产业转移研究综述

区际产业转移是发达区域产业结构调整升级的重要途径,是欠发达区域经济崛起发展的良好契机,也是区域产业结构优势转换升级的有效方式。本文从区际产业转移的概念、转移动力、转移战略和路径以及转移效应等四个方面对我国区际产业转移研究进行了综述。总体上,我国区际产业转移的概念研究趋于成熟,在区域产业转移的动力机理机制、准入门槛,产业转移与产业集聚,区域发展战略,地区生态环境等方面均有较多的研究。未来有关产业转移的研究可将触角伸入企业或消费者群等微观层面,以及产业转移与区域创新体系建设的联动效应等中观层次。     

Effects of neuromuscular function and split step on reaction speed in simulated tennis response

Abstract

The purpose of this study was to examine whether split step (small hop before step) would be more beneficial than no-split condition in simulated tennis response situation. In addition, it was studied if movement time of the response is related to separately measured force production capabilities and reflex sensitivity of the players. Nine skilled male tennis players participated in this study. Subjects stood on a force plate and reacted to a light signal and moved to appointed direction as fast as possible. With split step the participants were 13.1% faster (P <0.05) than without split step from the start to the distal end of the so called close range movement continuum (2.70 m). This was mainly explained by 43.6% faster time (P <0.05) from the signal to the onset of force production. Greater vertical forces were observed with split step: 15.7% greater F(z) mean force (P <0.05), 60.0% greater F(z) peak force (P<0.01). In split step both mean (r= ? 0.813, P <0.01) and peak (r=?0.765, P <0.05) vertical forces (Fz) correlated negatively with the time from the onset of the force production to the photocell. With split step higher EMGs were observed in muscles responsible for ankle joint movement indicating that different strategies were used. Due to the split step the players were able to start the movement faster which mostly explains the advantages over the no-split step condition. Split step condition may also benefit from stretch shortening type of muscle action.