关于自然辩证法学科建设若干问题的思考

20世纪下半叶以来,由于现代科学整体化的快速推进,自然辩证法学科已经遇到了越来越严重的挑战。在这种形势下,学科建设中的一些历史积淀问题重新凸现,同时还产生了一些新的重大问题。这些问题包括:自然辩证法的学科归属问题(学科性质问题、学科名称的复归问题、学科的定位问题)、自然辩证法研究中的几个重要问题(与科学技术史研究的相关问题、科学哲学和技术哲学的主攻方向问题、文风问题)、自然辩证法与相邻学科的关系问题(与马克思主义哲学原理和哲学其他分支、与经济学、与社会学的关系问题)。自然辩证法学科要在新世纪得到进一步发展,必须对这些问题作一个比较彻底的厘清。     

基于ActiGraph GT3X监测网球运动能量消耗的研究

目的:应用ActiGraph GT3X对网球运动等非周期性运动能量消耗进行测评,建立适合网球运动能耗预测的回归方程,从而丰富ActiGraph测量体系.方法:以K4b2测量值作为校标,分别在拍柄、持拍手手腕外侧、腰部髂肌外侧、大腿中央前侧和脚踝外侧(持拍手同一侧肢体)各佩戴一个加速度计(ActiGraph GT3X),同步对网球运动中不同球速下(30 km/h、60 km/h)的原地正、反手击球,侧向移动正、反手击球,向前移动正、反手击球,侧向移动正反手交替击球和模拟自由单打的运动过程进行监测.结果:腰部、大腿和踝关节部位GT3X的EE和MET预测值存在明显低估,与K4b2测量值一致性较低;手腕和拍柄部位GT3X的EE和MET预测值存在明显高估,与K4b2测量值一致性较低;研究建立了2个网球运动能耗预测回归方程,经检验其预测值与实测值没有显著性差异.结论:运用ActiGraph GT3X对网球等隔网对抗运动项目进行监测存在显著误差,EE和MET的预测存在明显高估或低估的现象;基于ActiGraph GT3X所建立的能耗预测方程能对网球运动进行有效的运动监测.     

The Will to Be Unveiled: Sufi Autobiographies in Classical Sufism

While autobiography as a special genre increasingly occupies an important position in modern scholarship, independent Sufi autobiographies still require additional and detailed examination. The current paper seeks to examine two spiritual autobiographies known very well in the history of Sufism: Al-?akīm al-Tirmidhī's Bad? sha?n, and Rūzbihān al-Baqlī's Kashf al-asrār. References to these works in modern research do not go beyond the assumption that they may represent visionary autobiographies, dreams, and mystical, extraordinary experiences and states. In the framework of this paper, we consider it essential to regard both texts as serious indicators of different realities, contexts, and mystic discourses.     

信息检索中模式匹配算法的分析

串的模式匹配是信息检索中的一个热点.文章介绍了模式匹配的概念,分析了串模式匹配中的BF算法和KMP算法,并对KMP算法进行了改进.实验结果表明:改进的KMP算法使信息检索具有更快的响应速度.参考文献5.     

第4届世界杯散打比赛决赛男子运动员技术特征分析

运用文献资料、录像观察、信息技术和数理统计等研究方法,对第4届世界杯武术散打比赛决赛中男子运动员技术动作的运用情况进行统计与分析。得出结论：拳法技术使用最为频繁,但多用于试探性进攻及搂抱情况下的无效攻击,成功率较低;腿法、摔法成功率较高,是运动员得分的主要技术手段;有方向性的发展拳法技术,重点发展腿法、摔法技术,使各项技术协调发展才能真正提高取胜几率。     

Alterations in Strength and Maximal Oxygen Uptake Consequent to Nautilus Circuit Weight Training

Abstract

The purpose of this study was to determine the effects of a Nautilus circuit weight training program on muscular strength and maximal oxygen uptake ([Vdot]O ₂ max) by comparing these effects to those produced by adhering to either a free weight (FW) strength training program or a running (R) program. Male college students who voluntarily enrolled in either a FW training class (n = 11), a Nautilus (N) circuit weight training class (n= 12), or a R conditioning class (n= 13) were subjects for this investigation. All groups participated in their respective programs 3 days per week for 10 weeks. Strength was assessed using a Cybex II isokinetic dynamometer set at an angular velocity of 60° · s ^?1 and a damping of 2. The FW group served as the control group for the assessment of [Vdot]O ₂ max changes, while the R group served as controls for the assessment of strength differences. ANCOVA revealed that the N and R groups experienced significant (p < .01) increases in [Vdot]O ₂ max expressed in L · min ^?1 (10.9 and 11.4%), ml · kg ^?1 · min ^?1 (10.8 and 11.7%), and ml · kgLBW ^?1 · min ^?1 (7.1 and 7.5%) when compared to the FW group. There were no significant differences between the N and R groups. There were no significant differences among groups in final peak torque values (after covariance), and torque at the beginning and end of the range of motion for the knee extensors, knee flexors, elbow extensors, and elbow flexors. In general, isokinetic strength values elicited by the N group compared favorably to those generated by the FW group. It was concluded that for a training period of short duration, Nautilus circuit weight training appears to be an equally effective alternative to standard free weight (strength) and aerobic (endurance) training programs for untrained individuals.     

CET4题型设计模式研究——基于任务特征理论的大学英语测试实证探索

任务型语言测试观为大学英语测试（CET）提供了新的理论基础。在Bachman与Palmer的测试任务五特征基础上,创设了新题型设计基本模式,并依据该模式设计新题型对CET4测试进行了初步探索。信度和效度实证检验的结果表明,新题型组的均值虽因主观性试题量的增加而略低于旧题型组,但两者间并无显著性差异。而且新题型还呈现出同期效度值比旧题型高的态势：同时其信度系数也较高且具有显著的统计学意义。     

Research on the operating characteristics of parallel 4-DOF electric platform with 4TPS-PS structure

The 4TPS-PS parallel platform designed for a stabilization and automatic tracking system is a novel lower-mobility parallel mechanism. In the first part of this paper, the structure of the platform is described and the kinematics model is built. The workspace of the platform is defined as the full reachable rotation workspace when the Z coordinate dimension of the upper plate varies continuously. A fast searching method of the full reachable workspace is presented, after which the inverse kinematics of the platform is deduced. The forward and inverse solutions of the speed and force of the platform are deduced. According to the characteristic of the 4TPS-PS platform’s structure, a fast searching algorithm of the maximum generalized speed and maximum generalized force output by the upper plate is put forward based on the forward and inverse solutions of the platform’s speed and force. The 4TPS-PS platform prototype built by the State Key Laboratory of Fluid Power Transmission and Control of China is taken as the research subject. The full reachable rotation workspace of the prototype is computed out and analyzed. The curves of maximum generalized speed and maximum generalized force of the prototype are computed out and plotted. Finally, the com- puting and analyzing results of the operating characteristics are confirmed through the experiment.     

An Improvement of MPEG-4 Rate Control Algorithm

Frame skipping in low bit video coding could significantly reduce the visual quality of reconstructed video. At the same time, if the complexity of the video sequence remains high for a long period, then driving up the long term average bit rate, the only resort of MPEG-4 Q2 rate control algorithm results in using a high quantization scale, which shows a poor visual quality of the reconstructed video. This paper analyzes the main causes of frame skipping in current MPEG-4 frame rate control scheme, and presents a new rate control algorithm based on the quadratic R-D model over a CBR channel. Key features of the present work are. 1) the bits allocated to each P-frame or B-frame are in proportion to its distance from the end of this GOP, i.e. more bits are allocated to the frames that are nearer to their reference Ⅰ -frame: 2) the target buffer level is changeable in the GOP, at the end of each GOP( five P-frames or B-frames), the target buffer level is linearly reduced from 1/2 to 1/4 of buffer size, to other frames, the target buffer level is set to 1/2 of buffer size: 3 ) a selective and judicious use of the reduced resolution mode, in addition to a modulation of the quantization scale parameter, is to control the average long term bit rate. Experimental results with different video sequences of varied complexity, encoded at low bit rates show better efficacy of the proposed algorithm than MPEG-4 Q2 rate control scheme, and the experimental results also show that the improved algorithm has significantly reduced the number of frame skipping, increased the overall PSNR, and improved the perceptual quality.     

论吴宓留学前的文化经历与其文化取向的关系

吴宓家族与近世三原大儒刘古愚关系密切。在清华求学近6年，吴宓与汤用彤、吴芳吉成为志同道合的好友，而且饶麓樵、J．Pickett等老师对他的诗歌赏鉴观和文化价值观倾向都有一定影响。同时，对儒家原典的熟读精思和对卡莱尔、爱默生、华兹华斯等人著述的阅读，也为他文化保守主义价值观的形成埋下了伏笔。分析吴宓当时的言论可知，是赴关留学以前的本土微观文化环境和经历促使吴宓主动选择了拜白壁德为师，并进而成为著名的文化保守主义者。