"职业教育"概念与功能的历史观

职业伴随着劳动分工而产生,职业教育则是近代大机器工业的产物.在不同的历史时期,人们从不同的角度观察,并对职业教育产生了不同的认识,以不同的名称表述,赋予不同的功能."五四"时期职业教育的多元共生,反映出人们对职业教育概念、功能的不同认识,这也是中国近代职业教育向现代职业教育跨越的重要标志.     

论亚里士多德的"第一推动者"

《物理学》中的“第一推动者”是在自然哲学内作为实体的不动的推动者,而《形而上学》中的“第一推动者”是在“理性-神”作为实体意义上来表述的。亚氏通过对“第一推动者”的论述,完成了从自然哲学到形而上学的过渡。     

吸血蛭与非吸血蛭间的氨基酸比较研究

为探究传统中药水蛭的药用成分，更好地开发利用蛭类资源，本文通过高效氨基酸分析仪，分析了云南四种蛭类的氨基酸组成．结果表明吸血蛭与非吸血蛭在氨基酸组成上有明显差异．结合以往实验，分析了非吸血蛭活血化瘀的可能药用成分，为合理开发利用蛭类资源提供了资料和建议．     

论邓小平"和平与发展"理论的实现途径

和平与发展是当今世界的两大主题,但实现和平与发展的道路并不平坦.如何消除障碍,实现全人类的和平与发展?邓小平提出了自己的看法和主张,那就是:在坚持和平共处五项原则的基础上,搁置争议,寻求共同利益,避免冲突;借鉴中国“一国两制“模式解决国际争端,即“一个世界,多种制度“,保持世界政治经济模式的多元化.这些理论已经并将继续对人类的和平与发展产生巨大的推动作用,科学地解读并运用好这些理论,不仅具有重要的现实意义,而且具有深远的历史意义.     

高原文化与陇东文学

陇东高原地区华夏民族灿烂的文化摇篮,是古羌族炎帝活动中心和西王母文化发祥地。由于南接陕北,北近宁蒙的独特地理位置,形成了这里独特的以中原农耕文化为主体,兼具游牧文化格局。陇东文化对文学创作有着巨大的影响力,本文从“现实的审视———理性烛照下的乡村文化”、“虚构的载体———精神想象中的家园”两个方面对陇东文学的特质与成就进行探讨。     

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.     

高职院校图书馆加强勤工助学管理之我见

高职院校图书馆目前存在工作量大与人员不足的矛盾。缓解这一矛盾的措施之一是聘请学生到图书馆勤工助学。学生到图书馆勘工助学,不仅可以减轻经济负担,而且还能提高综合能力；既强化了图书馆与学生读者的联系,也促进了图书馆的工作。应做好勘工助学学生的选拔、培训和管理。     

Improved fast intra prediction algorithm of H.264/AVC

With advanced prediction modes of intra prediction, intra coding of H.264/AVC offers significant coding gains compared with previous video coding standards. It uses an important tool called Lagrangian rate-distortion optimization (RDO) technique to decide the best coding mode for a block, but the computational burden is extremely high. In this paper, we proposed an improved fast intra prediction algorithm including block type selection and mode decision algorithm based on analysis of edge feature of a block. Our algorithm filters out unlikely block type and candidate modes to reduce the RDO calculations. Experimental results showed that the proposed algorithm can reduce the computation complexity of intra prediction from 52.90% to 56.31%, with 0.04 dB PSNR degradation and 2% increase of bit rate.     

张申府--不该被遗忘的学者政治家

张申府是与冯友兰、金岳霖等齐名的著名哲学家.是中国最早的马克思主义者、中共创始人之一,是敬爱的周恩来总理、朱德委员长的入党介绍人.参与组建民主同盟,并任民盟中常委和文化工作委员会主任.无论作为学者还是作为政治活动家,张申府都是不该被历史遗忘的.