O-200kPa气动控制信号检测系统的设计

为检测气动执行器常用控制信号0-200kPa气压,设计了基于MSP430单片机和压阻式压力传感器MPX2200的气压检测系统．阐述了检测系统的软硬件设计,给出了MPX2200恒流源电路和放大倍数可调的两级放大电路,介绍了软件设计中的标度变换、分段插值和中值滤波方法．该系统在电路设计上选用仪用放大器、单片机自带AD转换器,所用元器件少、功耗低、精度高,可广泛应用于智能化、低功耗化的气动执行机构及其元器件的设计中．     

无人直升机旋翼转速控制器设计

针对无人机的特殊性以及对电机动态性能的要求,设计了一种以ARM芯片LPC2148为核心的旋翼转速控制器。首先分析了直升机的飞行特点以及原旋翼转速控制器的不足,设计基于EKF和矢量控制的新旋翼转速控制器,并对扩展卡尔曼滤波法和矢量控制的模块进行说明,且给出了MATLAB仿真结果,验证了控制系统的正确性。     

基于ARM的电机动态参数检测与处理系统设计

电机运行时会产生各种电磁和共模干扰,影响电机参数的准确获取。传统的电机参数检测方法不能充分滤除现场出现的各种干扰信号,从而增大测量误差,影响测量参数的准确性。为此,本文设计了一种实用的干扰抑制技术,大大提高了测量参数的准确性和精确性。最后通过GSM／GPRS无线网络数字传输技术,将下位机采集到的电机参数发送给上位机中心专家诊断端系统,进行在线实时故障诊断和排除。     

高校大学生心理健康教育模式机制研究

针对目前我国高校大学生心理健康教育工作的现状,提出构建大学生心理健康教育模式机制的新思路,并积极探索高校大学生心理健康教育模式机制有效运行的对策,从而大幅度提高高校的心理健康教育水平,力图培养德、智、体全面发展的高素质人才。     

知识元的本质、结构与运动机制研究

[目的/意义]关于知识元的基本理论问题研究是开展知识组织、知识检索、知识发现等知识管理活动的基础。[方法/过程]首先界定了知识元内涵的理论边界,确定了研究的逻辑起点。通过考察知识和人类思维的映射关系,阐明了知识元的本质属性。依据知识元承载的内容语义依存关系,抽象出了知识元的内部结构及其特征。最后演绎推论出知识元的运动机制。[结果/结论]通过对知识元基本理论问题的梳理和研究,进一步明晰了知识元的内涵、本质属性、结构和运动机制,为以知识元为基础的知识组织与服务实践提供了坚实的理论基础。     

滤波器在图像处理中的应用

对原图像进行线性变换,增加了对比度和亮度,图像效果有了一定的改善;又用非锐化滤波器对修正后的图像进行了处理,对图像的过度失真进行了补偿,并对图像噪声滤波.     

中国足球超级联赛U23新政何以有效?——基于“足协-俱乐部”的博弈

中超联赛自2017赛季推出U23新政以来备受争议。在"上有政策下有对策"的非合作博弈下,U23新政如何才能实现政策初衷?该文首次采用不完全信息静态博弈模型分析了U23新政下足协与俱乐部的博弈均衡。研究表明：（1）足协推行新政的最优概率为俱乐部采取积极策略给足协带来的净收益与消极策略带来的净收益之比,实质上取决于俱乐部的遵从度。（2）在缺乏讨价还价权时,俱乐部对新政采取消极应对策略是为了减少净损失。俱乐部积极应对的最优概率为消极应对的净损失占其与积极应对的加成即期收益损失之和的比值,实为两害相权取其轻。为激励俱乐部采取积极策略,应降低俱乐部消极应对策略的净收益或积极应对策略的加成即期收益。（3）提高U23新政有效性的治标之策是减少U23政策对中下游球队的冲击,实行有差别的U23政策;对U23球员上场时间低于均值的俱乐部,实行等额或超额递减分成机制。治本之策是培育一个可预期、可持续、可盈利的足球市场,俱乐部能够内生出建立百年基业的长效机制;继续深化足协的去行政化改革,使之向完全社团法人转型。     

乒乓球运动员以预防损伤为主的功能训练

功能训练的理念来源于康复领域,现已逐步应用到运动训练中。由于乒乓球运动的项目特征,乒乓球运动员肩关节、腰椎关节、膝关节、踝关节、腕关节等部位容易出现运动损伤。通过对乒乓球运动员常出现的功能问题进行分析,寻找存在的常见问题,进而提出相应的功能训练建议。乒乓球运动员可根据情况,增加改善肩关节、胸椎关节、髋关节、踝关节的活动范围的训练,提高肩胛骨、核心和下肢稳定性的训练,以及改善肩袖、躯干肌力不平衡的训练,通过针对性的功能训练有效减少乒乓球运动员损伤的发生。     

Examining the influence of grip type on wrist and club head kinematics during the golf swing: Benefits of a local co-ordinate system

Wrist movements have been identified as an important factor in producing a successful golf swing, with their complex motion influencing both club head velocity and orientation. However, a detailed analysis of wrist angles is lacking in the literature. The purpose of this study was to determine kinematics across wrists and club head characteristics during the golf swing under weak, neutral and strong grip conditions. Twelve professional male golfers executed 24 shots using a driver under three grip conditions. A six degrees of freedom analysis of the hand with respect to the distal forearm was performed using a 10-camera three-dimensional motion capture system. Differences in joint angles were explored using repeated measures ANOVAs at key swing events (onset, top of backswing and impact), in addition club head velocity and clubface angle at impact were also explored. Main findings revealed significant differences in flexion/extension and internal/external rotation for both wrists at all swing events, whereas fewer significant interactions were found in ulnar/radial deviation across grips for both wrists at all events. Clubface angle only differed significantly between the weak and the strong and neural grips, presenting a more ‘open’ clubface to the intended hitting direction. This study is the first to explore tri-planar wrist movement and the effect of different grips, such analysis has implications for coaching knowledge and practice and should inform future research into different aspects of skill, technique analysis and may inform injury mechanisms/prevention.     

Contextual factors on physical demands in professional women’s soccer: Female Athletes in Motion study

The aim of this study was to examine the impact of contextual factors on relative locomotor and metabolic power distances during professional female soccer matches. Twenty-eight players (forwards, n?=?4; midfielders, n?=?12; defenders, n?=?12) that competed in a 90-min home and away match (regular season only). The generalised estimating equations (GEE) was used to evaluate relative locomotor and metabolic power distances for three contextual factors: location (home vs. away), type of turf (natural vs. artificial), and match outcome (win, loss and draw). No differences were observed for home vs. away matches. Moderate-intensity running (20.0?±?1.0?m?min^?1 and 16.4?±?0.9?m?min^?1), high-intensity running (8.6?±?0.4?m?min^?1 and 7.3?±?0.4?m?min^?1) and high-metabolic power (16.3?±?0.5?m?min^?1 and 14.4?±?0.5?m?min^?1) distances were elevated on artificial turf compared to natural grass, respectively. Relative sprint distance was greater during losses compared with draws (4.3?±?0.4?m?min^?1 and 3.4?±?0.3?m?min^?1). Overall physical demands of professional women’s soccer were not impacted by match location. However, the elevation of moderate and high-intensity demands while playing on artificial turf may have implications on match preparations as well as recovery strategies.