Accuracy and precision of loadsol® insole force-sensors for the quantification of ground reaction force-based biomechanical running parameters     

Wolfgang Seiberl  Elisabeth Jensen  Josephine Merker  Marco Leitel  Ansgar Schwirtz 《European Journal of Sport Science》2018,18(8):1100-1109

Force plates represent the “gold standard” in measuring running kinetics to predict performance or to identify the sources of running-related injuries. As these measurements are generally limited to laboratory analyses, wireless high-quality sensors for measuring in the field are needed. This work analysed the accuracy and precision of a new wireless insole forcesensor for quantifying running-related kinetic parameters. Vertical ground reaction force (GRF) was simultaneously measured with pit-mounted force plates (1?kHz) and loadsol^® sensors (100?Hz) under unshod forefoot and rearfoot running-step conditions. GRF data collections were repeated four times, each separated by 30 min treadmill running, to test influence of extended use. A repeated-measures ANOVA was used to identify differences between measurement devices. Additionally, mean bias and Bland–Altman limits of agreement (LoA) were calculated. We found a significant difference (p?® devices for these parameters. For these same parameters, the LoA analysis showed that 95% of all measurement differences between insole and force plate measurements were less than 12%, demonstrating high precision of the sensors. However, highly dynamic behaviour of GRF, such as force rate, is not yet sufficiently resolved by the insole devices, which is likely explained by the low sampling rate.  相似文献   

一种新型板式换热器在轻工行业的应用     

梁耀开  朱晓立  祝志清 《广东轻工职业技术学院学报》2009,8(4):8-10,17

介绍了一种能利用低压二次蒸汽的新型板式换热器在味精厂的应用。该板式换热器以味精厂结晶罐的二次蒸汽作加热介质,冷水被加热后作锅炉入炉水之用。一方面充分利用了二次蒸汽的冷凝潜热,节省了加热入炉水的热能（节省了燃煤）,同时又减少了二次蒸汽直接用水冷凝后排放对环境产生的热污染,节能减排效果十分显著。  相似文献   

一种改进BP神经网络的车牌字符识别方法     

李晓斌 《重庆职业技术学院学报》2009,18(2):90-94

文章提出了一种改进BP神经网络的车牌字符识别方法,进一步研究在干扰情况下的车牌识别问题,并采用系统化的方法,使用VC＋＋6．0设计并实现一个高效、鲁棒性好的车牌定位和识别系统。实验结果表明,提出的方法具有效率高、精确度好、对光照、旋转、噪声等具有良好的鲁棒性等特点．定位率和识别率可以达到90％以上。  相似文献   

一个可能最终确定以太存在与否的实验     

邵跃波 《大众科技》2013,(1):101-104

分析了“光行差”现象、“光速不变”现象、“洛奇钢盘实验”,认为地球有可能拖曳以太。论证了在绕地轨道上进行迈克尔逊一莫雷实验可以最终确定是否存在以太,并设计了相应的设备。  相似文献   

Effect of loading on peak power of the bar,body, and system during power cleans,squats, and jump squats     

Jeffrey M. McBride  Tracie L. Haines  Tyler J. Kirby 《Journal of sports sciences》2013,31(11):1215-1221

Abstract

Nine males (age 24.7 ± 2.1 years, height 175.3 ± 5.5 cm, body mass 80.8 ± 7.2 kg, power clean 1-RM 97.1 ± 6.36 kg, squat 1-RM = 138.3 ± 20.9 kg) participated in this study. On day 1, the participants performed a one-repetition maximum (1-RM) in the power clean and the squat. On days 2, 3, and 4, participants performed the power clean, squat or jump squat. Loading for the power clean ranged from 30% to 90% of the participant's power clean 1-RM and loading for the squat and jump squat ranged from 0% to 90% of the participant's squat 1-RM, all at 10% increments. Peak force, velocity, and power were calculated for the bar, body, and system (bar + body) for all power clean, squat, and jump squat trials. Results indicate that peak power for the bar, body, and system is differentially affected by load and movement pattern. When using the power clean, squat or jump squat for training, the optimal load in each exercise may vary. Throwing athletes or weightlifters may be most concerned with bar power, but jumpers or sprinters may be more concerned with body or system power. Thus, the exercise type and load vary according to the desired stimulus.  相似文献   

钢球撞击双层带间隙保护板炸药柱的爆炸分析     

陈忠富  梁斌  陈刚  徐伟芳 《绵阳师范学院学报》2007,26(8):1-5,13

采用LS-DYNA3D动力有限元程序对钢球撞击双层带间隙保护板炸药柱的爆炸过程进行了数值模拟分析。分析中采用了流固耦合与动力学接触模式,获得了钢球撞击的临界起爆速度,爆炸产生的峰值压力。研究表明,采取适当的保护措施,炸药制成的部件或装置的安全性能够得到保证。  相似文献   

独玉的成矿大地构造背景分析   总被引：1，自引：1，他引：1  

江富建  白景锋 《南阳师范学院学报》2003,2(3):68-71

独玉矿床位于华北板块和华南板块之间的秦岭造山带中段，其成因与秦岭造山带的构造演化密切相关。利用岩石化学方法判别及ESCORT专家系统分析可知，独山岩体属于发育在秦岭洋洋壳上的岛弧火山岩，它为独玉的形成准备了物质条件。随着秦岭造山带的逐步形成，该岩体在断裂、挤压作用下被抬升至地表，从而形成孤立的岩体——独山岩体。  相似文献   

从烂版废液中回收硫酸铜实验的改进     

名鲜花 《雁北师范学院学报》2003,19(2):35-36,39

改进了从烂版废液中回收硫酸铜的实验。并且回收的硫酸铜纯度在95％以上。原料中的铜近于定量回收，污染也小，并进一步指出了工业应用的可能性。  相似文献   

用复变函数方法求解在横向载荷作用下的固支圆板     

曹富新  杨春秋 《大连大学学报》1991,(4)

本文利用文献中的方法具体的求解了固支圆板在横向载荷作用下的解。  相似文献   

考虑剪切效应有限变形粘弹性板的动力稳定性   总被引：4，自引：0，他引：4  

李晶晶  程昌钧  张能辉 《上海大学学报(英文版)》2002,6(2):115-124

Based on Reddy‘s theory of plates with higher-order shear deformations and the Boltzmann superposition principles,the governing equations were established for dynamic stability of viscoelastic plates with finite deformations taking account of shear effects,The Galerkin method was applied to simplify the set of equations.The numerical methods in nonlinear dynamics were used to solve the simplified system.It could e seen that there are plenty of dynamic properties for this kind of viscoelastic plates under transverse harmonic loads.The influences of the transverse shear deformations and material parameter on the dynamic behavior of nonlinear viscoelatic plates were investigated.  相似文献