Acute effects of different warm-up protocols on highly skilled golfers’ drive performance

Previous research has highlighted the positive effect that different warm-up protocols have on golf performance (e.g. Sorbie et al., 2016; Tilley & Macfarlane, 2012) with the design of warm-ups and programmes targeting and improving golf performance through the activation and development of specific muscle groups. This study aimed to examine the acute effects of two warm-up protocols on golf drive performance in comparison to a control condition. Using a randomised counterbalanced design over three testing sessions, twenty-three highly skilled golfers completed the control, dynamic and resistance-band warm-up conditions. Following each condition, a GC2 launch monitor was used to record ball velocity and other launch parameters of ten shots hit with the participants’ own driver. A repeated-measures ANOVA found significant increases in ball velocity (η_p² = .217) between the control and both the dynamic and resistance-band warm-up conditions but no difference between these latter two, and a reduction in launch angle between control and dynamic conditions. The use of either a dynamic stretching or resistance-band warm-up can have acute benefits on ball velocity but golfers should liaise with a PGA Professional golf coach to effectively integrate this into their golf driving performance.     

基于多普勒频谱图的力量项目运动员左室舒张期室壁运动研究

通过测定和比较正常人和力量项目运动员在静息和逐级递增负荷运动时,室壁多普勒频谱图上E波和A波峰值速度,研究左室后壁主动松弛和被动充盈功能的变化。结果表明：在静息状态,力量项目组房缩期心房收缩对于左室舒张充盈的贡献小于正常组;在逐级递增负荷中,力量项目组心脏舒张功能的动员表现为同时动用主动舒张储备和左房收缩储备,显示出心脏主动舒张的能力强,左房收缩储备大。     

产业集聚与区域创新——基于静态与动态空间面板模型的实证研究

基于2003—2012年中国省级面板数据,采用静态与动态空间面板模型分析了产业集聚对区域创新能力的影响。结果显示:制造业集聚显著地促进了区域创新能力的提升,生产性服务业集聚抑制了区域创新能力的提升,研发经费投入和研发人员投入有利于区域创新能力的提升,并且研发经费投入对区域创新能力提升的贡献最大;静态空间模型对空间溢出效应产生过高估计,动态空间模型由于分离出了前期相关因素对本期的影响,使得估计结果得以部分矫正。     

基于有限元分析的纳米级微进给平台设计

设计了一种利用弹性铰链作为预紧机构、高精度滚动导轨作为导向机构的单PZT驱动的微进给平台。利用有限元方法对微进给平台的结构和静、动态特性进行了研究。在静态特性中着重分析了微进给平台的静态刚度,得出整个动平台的工作平面上的刚度分布图。在动态特性分析中着重研究了微进给平台的模态振型、固有频率和谐波激励响应,得出了激进给平台在动态激振力作用下的特性。最后分析了微进给平台工作平面上静态刚度和动态刚度变化很大的原因,并提出一些改进的措施。     

黑洼水库地区GPS平面控制网的布设与实施

运用GPS相对静态测量技术,按照D级GPS控制网的要求,采用边连式的布网方案,设计并实测了黑洼水库地区GPS平面控制网,再通过LGO等数据处理软件进行控制网平差,获取该平面控制网的坐标数据。该GPS平面控制网的建设将为黑洼水库地区的规划建设和地形测量提供基础资料。     

幼儿早期阅读现状与策略调查研究

当前,早期阅读受到了幼儿园(所)、老师、幼儿家长的广泛重视。文章从进行早期阅读的方式出发,以桂林市解放西路幼儿园为例,对中班幼儿静态性阅读和动态性阅读现状进行调查,指出存在的问题、分析原因,并提出解决问题的策略。     

Movement and stretching imagery during flexibility training

Abstract

The aim of this study was to examine the effect of movement and stretching imagery on increases in flexibility. Thirty volunteers took part in a 4 week flexibility training programme. They were randomly assigned to one of three groups: (1) movement imagery, where participants imagined moving the limb they were stretching; (2) stretching imagery, where participants imagined the physiological processes involved in stretching the muscle; and (3) control, where participants did not engage in mental imagery. Active and passive range of motion around the hip was assessed before and after the programme. Participants provided specific ratings of vividness and comfort throughout the programme. Results showed significant increases in flexibility over time, but no differences between the three groups. A significant relationship was found, however, between improved flexibility and vividness ratings in the movement imagery group. Furthermore, both imagery groups scored significantly higher than the control group on levels of comfort, with the movement imagery group also scoring significantly higher than the stretching imagery group. We conclude that the imagery had stronger psychological than physiological effects, but that there is potential for enhancing physiological effects by maximizing imagery vividness, particularly for movement imagery.     

Pspice在电子电路分析中的应用

通过对电子电路的Pspice仿真分析 ,说明了Pspice在电子电路分析中的重要作用 ,并对比微变等效电路分析结果与仿真分析结果 ,加深对放大电路原理的理解     

无穷区间上S分布时滞静态递归神经网络模型的全局周期吸引子

研究了无穷区间上S分布时滞静态递归神经网络模型的全局吸引子,并给出了有实用性的判据和实例.     

管式电除尘器本体电阻特性的分析

以水泥工业普通回转窑无尘烟气为例,提出了管式电除尘器本体静态电阻、动态电阻概念,并对本体静态电阻、动态电阻随工况烟气成分的浓度,温度、压力的改变而呈现的变化规律进行研究.