低频脉冲电治疗联合等速肌力训练对脑卒中偏瘫患者肢体活动能力的影响

目的探究低频脉冲电治疗联合等速肌力训练对脑卒中偏瘫患者肢体活动能力的影响.方法纳入我院2019年12月—2021年12月收治的92例脑卒中偏瘫患者,按随机数字表法分为对照组和观察组,各46例.对照组予以常规康复训练,观察组在对照组基础上增加低频脉冲电治疗联合等速肌力训练,均持续干预4周.比较两组肌力恢复情况、肢体运动功能、平衡及生活能力.结果观察组干预后伸膝肌峰力矩(PT)(56.22±6.86)N?M、屈膝肌PT(36.49±6.21)N?M均高于对照组,Fugl-Meyer运动功能评估量表中上肢功能评分(40.11±6.84)分、下肢功能评分(19.15±3.64)分均高于对照组,Berg平衡量表评分(40.11±4.25)分、Barthel指数评定量表评分(76.38±6.39)分均高于对照组,组间差异有统计学意义(P<0.05).结论对脑卒中偏瘫患者采用低频脉冲电治疗联合等速肌力训练,能够有效增强肌力,改善肢体运动功能,提高平衡、生活能力.

Simulation of grid tracking control of power system connection and maximum power brushless doubly-fed generator in point wind

In this paper, based on the analysis of the mathematical model in a common synchronous reference frame of the brushless doubly-fed generator （BDFG）, the grid connection strategy and maximum energy extraction control were both analyzed. Besides, the transient simula- tion of no-load model and generation model of the BDFG have been developed on the MATLAB/Simulink platform. The test results during cutting-in grid confirmed the good dynamic performance of grid synchronization and effective power control approach for the BDFG-based variable speed wind turbines.

衬底对单脉冲激光烧蚀下环境密度恢复时间的影响

假定烧蚀粒子与环境气体原子均为刚性硬球,采用蒙特卡罗(Monte Carlo)方法,对单脉冲激光烧蚀产生的硅(Si)粒子在1000Pa环境氦(He)气中的传输过程进行了数值模拟,研究了衬底对环境密度恢复时间的影响。结果发现,衬底对粒子完全反弹和完全吸附的情况下对应的环境密度恢复时间分别为1713.2μs和1663.2μs,并且随着衬底对粒子临界吸附速度的增大,环境密度恢复时间先增大后减小。