我国男子110m栏运动员跑跨若干技术特征的分析   总被引：17，自引：1，他引：16  

宋跃先  彭支玉 《广州体育学院学报》2001,21(1):96-99

为我国110m栏运动水平的提高与发展，通过收集的我国优秀110m栏运动员的比赛技术参数与第6届世锦赛前7名运动员的比赛技术参数进行对比分析，发现我国优秀运动员的跨栏步在起跨攻栏阶段与世界优秀运动员相比无显性差异，但下栏距离明显偏长而使跨栏步腾空时问耗时多于对方0．5s，占两组比赛成绩差值的85％；另外，虽然全程速度曲线的变化规律与世锦赛选手大体一致，都呈“～”型，但栏间最高速度、保持速度的能力以及终点加速冲刺的能力均明显差于对方，这些都有待于我国运动员今后努力改进与提高。  相似文献   

专项训练对青少年排球运动员血流动力学参数的影响     

王广峰  李骁君  林晓光  卢成义  王朝群  龚大利  陈雪梅 《山东体育学院学报》2004,20(2):46-47,64

对青少年排球运动员安静状态、运动状态血流动力学参数进行测量。结果表明，排球专项化训练使青少年运动员左室腔扩大，心肌收缩能力增强。  相似文献   

Numerical method to determine mechanical parameters of engineering design in rock masses     

薛廷河  项贻强  郭发忠 《Journal of Zhejiang University. Science. B》2004,(7)

INTRODUCTION The historical development of research in rockmechanics has yielded numerous useful and work-able theories. The Coulomb Criterion (1772) andMohr’s Hypothesis (1990) both provide easy andeffective methods for determining mechanical pa-rameters such as rock strength. R.E. Goodmanformulated the equation of mesh and non-meshjoints construction. Other researchers conductedexperiments on different types of rock masses withspecific, unique properties, to solve increasinglyc…  相似文献   

Comparison of impact forces,accelerations and ankle range of motion in surfing-related landing tasks     

Lina E. Lundgren  Tai T. Tran  Sophia Nimphius  Ellen Raymond  Josh L. Secomb  Oliver R.L. Farley 《Journal of sports sciences》2016,34(11):1051-1057

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Assessment of three-dimensional joint kinematics of the upper limb during simulated swimming using wearable inertial-magnetic measurement units     

Silvia Fantozzi  Andrea Giovanardi  Fabrício Anício Magalhães  Rocco Di Michele  Matteo Cortesi  Giorgio Gatta 《Journal of sports sciences》2016,34(11):1073-1080

The analysis of the joint kinematics during swimming plays a fundamental role both in sports conditioning and in clinical contexts. Contrary to the traditional video analysis, wearable inertial-magnetic measurements units (IMMUs) allow to analyse both the underwater and aerial phases of the swimming stroke over the whole length of the swimming pool. Furthermore, the rapid calibration and short data processing required by IMMUs provide coaches and athletes with an immediate feedback on swimming kinematics during training. This study aimed to develop a protocol to assess the three-dimensional kinematics of the upper limbs during swimming using IMMUs. Kinematics were evaluated during simulated dry-land swimming trials performed in the laboratory by eight swimmers. A stereo-photogrammetric system was used as the gold standard. The results showed high coefficient of multiple correlation (CMC) values, with median (first–third quartile) of 0.97 (0.93–0.95) and 0.99 (0.97–0.99) for simulated front-crawl and breaststroke, respectively. Furthermore, the joint angles were estimated with an accuracy increasing from distal to proximal joints, with wrist indices showing median CMC values always higher than 0.90. The present findings represent an important step towards the practical use of technology based on IMMUs for the kinematic analysis of swimming in applied contexts.  相似文献   

热喷涂机器人离线编程     

方丹丹  邓思豪  廖汉林 《教育技术导刊》2007,(13)

在介绍热喷涂机器人2种编程方法和机器人离线编程的基础上,概括叙述了从机器人离线编程阶段到应用于实际车间机器人喷涂的整个步骤;针对实际机器人喷涂过程中出现的机器人与车间里的设备碰撞的问题,提出了较好的解决方案,即建立虚拟车间;详细介绍了热喷涂虚拟车间的设计、建立步骤。实际的应用效果表明,虚拟车间的建立,避免了重大事故的发生,缩短了离线编程的时间,提高了生产率。  相似文献   

初等积分法中的两个问题     

张鸣 《郧阳师范高等专科学校学报》2003,23(3):7-8

分析并讨论了一阶线性微分方程和二阶常系数线性微分方程的求解方法，同时提供了在教学中如何分析和解决问题的两个实例。  相似文献   

外界条件对溴冷机性能影响的研究     

朱章竞  朱建华 《茂名学院学报》2001,11(4):56-59

溴化锂吸收式制冷机的性能，通常指运行时所产生的冷量及与之相关的热力系数，蒸汽单耗等技术经济指标而言，分析影响溴冷机性能的各种因素，研究提高溴冷机性能，延长使用寿命的方案。  相似文献   

压控振荡器中振荡电路的设计     

朱志平 《渭南师范学院学报》2011,(10):71-74

介绍了一种振荡器,采用输出波形好、频率稳定度高、具有波段切换功能的改进型电容三点式振荡电路．在每一个波段内,频率的调节是通过改变压控振荡器的变容二极管的直流反向电压实现的．  相似文献   

锚注支护在软岩巷道中的应用     

李庆东 《淮南职业技术学院学报》2002,2(1):26-27,32

叙述了潘三矿软岩巷道的特征，锚注支护设计参数的确定与工程应用情况，表明锚注支护是软岩支护的一种有效方案。  相似文献