三种负荷方法对男子足球运动员肺通气功能的影响

运用长期追踪实验法对足球运动员的一般耐力训练作了研究,探讨了三种负荷方法对男子足球运动员肺通气功能的影响,试图为足球运动员一般耐力训练提供一种有效的实用方法。     

Validation of two accelerometers to determine mechanical loading of physical activities in children

The purpose of this study was to assess the validity of accelerometers using force plates (i.e., ground reaction force (GRF)) during the performance of different tasks of daily physical activity in children. Thirteen children (10.1 (range 5.4–15.7) years, 3 girls) wore two accelerometers (ActiGraph GT3X+ (ACT), GENEA (GEN)) at the hip that provide raw acceleration signals at 100 Hz. Participants completed different tasks (walking, jogging, running, landings from boxes of different height, rope skipping, dancing) on a force plate. GRF was collected for one step per trial (10 trials) for ambulatory movements and for all landings (10 trials), rope skips and dance procedures. Accelerometer outputs as peak loading (g) per activity were averaged. ANOVA, correlation analyses and Bland–Altman plots were computed to determine validity of accelerometers using GRF. There was a main effect of task with increasing acceleration values in tasks with increasing locomotion speed and landing height (P < 0.001). Data from ACT and GEN correlated with GRF (r = 0.90 and 0.89, respectively) and between each other (r = 0.98), but both accelerometers consistently overestimated GRF. The new generation of accelerometer models that allow raw signal detection are reasonably accurate to measure impact loading of bone in children, although they systematically overestimate GRF.     

Adaptive output feedback neural network control of uncertain non-affine systems with unknown control direction

This paper deals with the problem of adaptive output feedback neural network controller design for a SISO non-affine nonlinear system. Since in practice all system states are not available in output measurement, an observer is designed to estimate these states. In comparison with the existing approaches, the current method does not require any information about the sign of control gain. In order to handle the unknown sign of the control direction, the Nussbaum-type function is utilized. In order to approximate the unknown nonlinear function, neural network is firstly exploited, and then to compensate the approximation error and external disturbance a robustifying term is employed. The proposed controller is designed based on strict-positive-real (SPR) Lyapunov stability theory to ensure the asymptotic stability of the closed-loop system. Finally, two simulation studies are presented to demonstrate the effectiveness of the developed scheme.     

运动对心脏内分泌功能的影响

本文对从事小长跑项目的男运动员(运动组)和未经过任何专项训练的男青年(对照组)各12名,进行了中等强度的急性动力性负荷实验,并于实验前后测试血浆心钠索,结果发现:运动后运动组和对照组对象的平均血浆心钠素水平均明显高于运动前(P<0.05,P<0.01);运动前后对照组对象的平均血浆心钠素量也分别明显高于运动组(P<0.05,P<0.01)     

集装箱装箱辅助决策系统

为提高集装箱空间利用率,根据集装箱装箱作业的实际操作要求,开发提供辅助性决策的集装箱装箱系统软件.该软件由参数设置、环境设置、计划制订、装载计算等4个模块组成,充分考虑集装箱装箱过程中的复杂约束,采用启发式算法对模型进行求解.对2个实例的分析表明,由该软件提出的装箱方案可以为工作人员提供辅助性决策,提高集装箱空间的利用...     

火灾场冲击荷载作用下刚塑性简支钢梁醮残余变形

根据火灾温度的变化,考虑火灾高温对结构钢屈服强度和梁塑性弯矩的影响,分析了火灾均布冲击荷载作用下简支钢梁的动力响应,计算了火灾场简支钢梁在均布冲击荷载作用下的残余变形,分析表明冲击荷栽和火灾高温钢梁的变形具有显著的影响。     

热冲击和冲击荷载作用下弹塑性薄板的综合变形分析

在计算火灾爆炸环境中弹塑性简支薄板变形时,同时考虑了热冲击和均布冲击荷载的作用,建立了薄板的运动方程,研究并分析了弹塑性简支薄板的综合变形,其分析结果表明弹塑性简支薄板受到热冲击和均布冲击荷载作用时,应综合分析这两种不同荷载的作用。     

基于Unity3D的手机触屏类游戏关键技术研究与实现

随着高端智能手机的发展,触屏类手机游戏逐步成为新的娱乐方式.而对于触屏类手机游戏设计与交互性方面的研究成为新的热点.针对触屏类手机游戏开发中界面趣味性、人机交互性、操作灵活性等共性问题,基于Unity3D触屏事件处理机制,着重于快速完成自定义地形场景、模型动态显示及人工智能等关键技术的研究与实现,并基于Unity3D游戏引擎开发Android触屏类手机游戏,满足游戏场景真实性、趣味性及交互性,对触屏类手机开发具有一定的参考价值.     

刺激经穴调整运动员生理机能的研究

对24名受试者采用自身对照法进行实验研究，让其在BIODEX多关节测力及康复系统仪器上进行定量运动负荷试验。结果证明刺激经穴可以使肌肉的耐力增加，运动负荷中肌肉功率及做功能力衰减值少，减少负荷后疲劳肌肉的肌张力，促进肌肉的恢复。对27名受试者采用自身对照法进行实验研究，让其在卧位心功量计上进行定量运动负荷实验，通过超声心动图检查，证明刺激经穴可以激发心脏心力储备的潜力，提高运动中心脏的舒张机能和收缩机能，加速运动后心脏机能的恢复。     

荷重整体动作力量素质多种能力的理论研究

在现代力量素质等张负重训练理论与方法中，以荷重作为练习强度及确定发展不同类型力量素质负荷结构的主导因素，对于实现力量素质训练的科学化有一定的局限性。据此提出并建立了运动员荷重状态下整体动作力量素质多种能力的理论，为同一动作结构动力性力量素质训练的定向化、定量化、个体化提供了一种新的理论与方法。