On－Line Identification of Grinding Burn and Wheel Wear Based on Grinding Chips Thermal Flow

Ｏｎ－ＬｉｎｅＩｄｅｎｔｉｆｉｃａｔｉｏｎｏｆＧｒｉｎｄｉｎｇＢｕｒｎａｎｄＷｈｅｅｌＷｅａｒＢａｓｅｄｏｎＧｒｉｎｄｉｎｇＣｈｉｐｓＴｈｅｒｍａｌＦｌｏｗＳｈｉＪｉｎｆｅｉ（史金飞）ＺｈａｎｇＸｉａｏｌｉｎｇ（张晓玲）ＺｈｏｎｇＢｉｎｇｌｉｎ（钟...     

某型号采煤机行走轮的改进设计

介绍了MG800／2040-WD型采煤机的行走部,并分析其工作方式。对该型电牵引采煤机的行走轮进行改进设计,得到一个更适合齿轮—销排传动方式的行走轮,从而提高了该采煤机的工作效率。     

中国式跤术中“圆轮”现象的初步研究

为了中国式跤术的发展,使运动员更好地理解与合理地运用摔跤技术,采用文献资料、归纳、专家访问和例证分析等方法对中国式跤术中普遍存在的“圆轮”现象的运动学原理和在实战中的应用与变化规律进行研究。结果表明：“圆轮”现象广泛存在于中国式跤术中;力偶是“圆轮”现象的力学基础,跤术中的“圆轮”现象取决于力偶矩;身作姿势、发力方向、动作时间、动作速度、动作力量、着力点、肢体的旋转惯量、动作节奏是影响“圆轮”现象的因素。     

运动与脑源性神经营养因子的研究进展

为了解运动对脑源性神经营养因子（BDNF）的影响,采用文献资料法论述了BDNF的结构与生物学特性,综述了国内外有关运动与BDNF关系的研究进展及该领域研究中存在的一些问题。结果表明：无论是规律性有氧运动,还是短时间急性运动都可以诱导BNDF的释放进而有利于增强神经系统的运动健康效应。     

磨削方式对单晶硅表面磨削温度的影响

研究金刚石砂轮磨削单晶硅片时的表面磨削温度 .针对平形砂轮和杯形砂轮两种不同平面磨削方式所产生的表面磨削温度特点进行了比较分析 .对砂轮粒度和磨削深度对这两种平面磨削方式的表面磨削温度的影响进行了试验研究 ,得到了一些有意义的试验结果和结论     

采用螺旋驱动轮的管道检测用微机器人

The micro robot based on screw motion wheels, which features high payload/mass ratio, fast and continuous motion, adaptation to pipe diameter or roundness variations, is suitable for locomotion and inspection inside small-diameter pipelines. The robot inspection system, Tubot I, developed at Shanghai University is composed of locomotion mechanism with an inner motor, a micro CCD camera and a monitor outside the pipeline. In the paper, the kinematics and statics analyses are presented for the screw locomotion system of Tubot I. The moving characteristics are obtained from experiments on the robot prototype. Supported by National High-Tech R & D Program in China(863-512-9704-26,863-512-9804-18)     

汽车防抱制动系统(ABS)的组成元件介绍

介绍德国波许公司具有代表性的ABS2S型汽车抱制动系统的组成元件的结构和功能。     

优秀棒球投手的等速肌力与投球运动学参数间关联研究

目的：：探讨棒球投手运动学与等速肌力参数间关联关系,并比较不同类型投手各类参数的差异性。方法：采用德国ISOMED2000等速肌力测试系统及三台高速摄像机获取相关参数。结果：( a)肩关节外、内旋峰力矩及屈、伸峰力矩两个比值高度相关,两者均与挥肘速度、棒球出手及触垒速度高度正相关;( b)与“非衡型”棒球投手相比,“均衡型”投手在许多关键参数上存有显著差异,表现为投球动作总时间、提膝时间、伸踏时间及动作加速时间显著变短;肘关节屈伸幅度、棒球出手等及触垒速度则显著增大;( c)挥肘速度与肩关节最大外展角存有显著正相关,而与投球动作总时间呈负相关;动作加速时间与肩关节最大外展角成负相关,却与躯干扭转角成正相关;( d)棒球出手及触垒速度均与肩关节最大外展角等呈显著正相关。结论：目前我国大学生优秀棒球投手与国外同级别投手相比,在众多运动学测试指标上存有显著差距,而投掷臂肌力发展不均衡是问题的关键所在。     

女子太极拳腾空摆莲540度接雀地龙技术动作研究

应用摄像电脑分析技术等研究手段,依据运动生物力学原理划分腾空摆莲540度接雀地龙的技术动作环节,确定针对性训练监测指标,及时诊断技术动作,实施助力辅助练习和模拟比赛负荷强度训练。结果显示,运动员大幅增加了腾空转体度数并建立了理想的技术动作模式。     

The kinematic differences between skill levels in the squash forehand drive,volley and drop strokes

ABSTRACT

Knowledge of the kinematic differences that separate highly skilled and less-skilled squash players could assist the progression of talent development. This study compared trunk, upper-limb and racket kinematics between two groups of nine highly skilled and less-skilled male athletes for forehand drive, volley and drop strokes. A 15-camera motion analysis system recorded three-dimensional trajectories, with five shots analysed per participant per stroke. The highly skilled group had significantly (p < 0.05) larger forearm pronation/supination range-of-motion and wrist extension angles at impact than the less-skilled. The less-skilled group had a significantly more “open” racket face and slower racket velocities at impact than the highly skilled. Rates of shoulder internal rotation, forearm pronation, elbow extension and wrist flexion at impact were greater in the drive stroke than in the other strokes. The position of the racket at impact in the volley was significantly more anterior to the shoulder than in the other strokes, with a smaller trunk rotation angular velocity. Players used less shoulder internal/external rotation, forearm pronation/supination, elbow and wrist flexion/extension ranges-of-motions and angular velocities at impact in the drop stroke than in the other strokes. These findings provide useful insights into the technical differences that separate highly skilled from less-skilled players and provide a kinematic distinction between stroke types.