短行程直线直流电机的电磁优化设计与分析

本文针对三种不同永磁体阵列结构,分别建立了有限元模型,运用麦克斯韦方程组和虚功原理,对各自的气隙磁场分布和洛伦兹力波动进行计算,通过对比结果得到了较为优化的永磁阵列结构,为短行程直线直流电机结构设计提供理论依据。     

冲裁模具降低成本和提高寿命的几条途径

从模具的设计制造、安装使用以及压力机的精度等三方面对模具的制造、维修成本和使用寿命的影响进行比较详细的分析,提出了从冷冲模具的设计制造、安装使用和提高压力机精度等方面入手,降低模具制造维修费用、提高工艺性能和延长模具使用寿命的方法作了比较全面的阐述,对降低冲压产品的生产成本具有很好的指导作用。     

Quantifying stroke coordination during the breathing action in front-crawl swimming using an instantaneous net drag force profile

Abstract

This study used both an instantaneous net drag force profile and a symmetry timing to evaluate the effect of the breathing action on stroke coordination. Twenty elite swimmers completed a total of six randomised front-crawl towing trials: (i) three breathing trials and (ii) three non-breathing trials. The net drag force was measured using an assisted towing device mounted upon a Kistler force platform, and this equipment towed the swimmer at a constant speed. The net drag force profile was used to create a stroke symmetry index for each swimming trial. Analysis using the symmetry indices identified that the majority of participants demonstrated an asymmetrical instantaneous net drag force stroke profile in both the breathing and non-breathing conditions, despite no significant differences in the time from finger-tip entry to finger-tip exit. Within the breathing condition, the faster swimmers compared to the slower swimmers demonstrated a lesser percentage of overlap between stroke phases on their breathing stroke side. During the non-breathing condition, the faster participants compared to the slower swimmers recorded a reduction in the percentage of overlap between stroke phases and less duration in the underwater stroke on their breathing stroke side. This study identified that the majority of participants demonstrated an asymmetrical net drag force profile within both conditions; however, asymmetry was less prevalent when examining with only the timing symmetry index.     

脑卒中发病环境因素分析及干预

本文以发病时间为统计指标,以诊断时间为辅助．首先运用Excel、SPSS软件以直方图的形式从横向和纵向两个层面对脑卒中发病人群进行了统计描述．其次,利用MatLab程序构建了多元回归模型,并以立体切片图形式直观展现了脑卒中发病率与气温、气压、相对湿度间的关系．最后,阐述了脑卒中发病的危险因素、发病前的预警信号与预防措施以及对高危人群提出了预警和干预的建议方案．     

糖尿病性脑卒中患者早期按摩配合运动疗法疗效分析

目的:研究糖尿病性脑血管病患者的康复问题,探讨采用以神经发育疗法和运动再学习技术为主的运动疗法,同时结合早期手法按摩在不同类型糖尿病性脑血管病患者康复治疗中的作用,为糖尿病性脑血管病患者的康复提供临床依据.方法:将80例38～73岁确诊为糖尿病性脑血管病的患者随机分为三组进行研究.结果:一个月的观察期后,各组患者的运动功能、日常生活活动能力均有改善,但综合康复组患者的疗效优于按摩组和对照组(P<0.05).接受相同方法治疗(综合康复或按摩)后的不同类型(缺血性或失血性)脑卒中相互比较,MBI与FMA评分增加幅度虽有不同,但差异不显著(P>0.05).结论:早期手法按摩治疗可以显著改善不同类型糖尿病性脑卒中患者的运动功能和日常生活活动能力,但手法按摩配合运动疗法的综合康复效果要明显好于单纯的手法按摩,相同治疗对不同类型糖尿病性脑卒中疗效是一致的.     

“一招制敌”在格斗训练中的运用研究

格斗是构成军警体育的重要内容之一,是近战、夜战、侦察、捕俘和反恐作战中对付敌人的一种军事技能。当今军警领域,高技术的普遍运用使战争节奏快,作战环境险恶,参战人员往往要突破生理极限去承受更大的战斗强度和战场压力,这对军警人员的体能提出了更高的要求。同时,这也迫使我们必须树立一招制敌的新观念去寻求新的训练方法,最大限度发挥军警人员的体能潜力,提高军警人员的战斗力。     

Belonging,school support and communication: Essential aspects of school success for students with cerebral palsy in mainstream schools

PurposeInvestigate successful school experiences for students with cerebral palsy (CP); identify and describe learning and participation at school.MethodsA phenomenologically-informed qualitative study using in-depth interviews with students (n = 7), parents (n = 11), teachers (n = 10), principals (n = 9), and allied health (n = 10) was conducted to investigate multiple perceptions. Thematic analysis occurred within and between groups.ResultsThree themes were identified: Students belong and benefit; Classroom enablers that help; Communication is crucial.ConclusionsStudents’ school experiences are enhanced by innovative classroom solutions that support classroom learning and involvement. Students rely on a diverse team that communicate well and implement individualised solutions that enable success.     

论易通输入法与最佳四键一字汉字形码输入法的关系

讨论确定易通输入法编码质量的四要素与确定最佳四键一字汉字形码输入法编码质量的四要素间的关系,论证易通输人法与最佳四键一字汉字形码输入法的关系是：易通输入法的研究已找到获取最佳四键一字汉字形码输入法的必用工具和必用办法,易通输入法与最佳四键一字汉字形码输入法的差距已经不大,且其差距都基本产生于对编码质量影响不大的不确定因素,最佳四键一字汉字形码输入法只宜在易通输入法的基础上通过修改对编码质量影响不大的次要做法获得。     

血脂对老年慢性心房颤动患者缺血性中风的影响

目的探讨血脂对老年慢性心房颤动(chronic atrial fibrillation,CAF)患者发生缺血性中风的影响.方法对资料完整的182例老年(＞60岁)CAF患者进行前瞻性研究,分析血脂与缺血性中风的关系.结果老年CAF患者血清胆固醇和甘油三酯增高、高密度脂蛋白降低与缺血性中风有明显关系(P＜0.05),其中胆固醇增高与缺血性中风关系最显著(P＜0.001).结论血脂异常是老年CAF患者发生缺血性中风的重要危险因素.     

The impact of start strategy on start performance in alpine skiing exists on flat,but not on steep inclines

Here, we explored the relationship between incline and start strategy during alpine skiing. Eight FIS skiers performed starts on a flat (3°) and steep (21°) incline employing five different strategies. Their times, trajectories and velocities were monitored with a GNSS system and video. A significant interaction was observed between slope incline and start strategy with respect to the skier’s exit velocity (p < 0.001, ?²_p = 0.716), but not for the start section time (p = 0.732, ?²_p = 0.037). On the almost flat incline, both section time (p = 0.022, ?²_p = 0.438) and exit velocity (p < 0.001, ?²_p = 0.786) were influenced significantly by start strategy, with four V2 skate-pushes being optimal. On the steep incline, neither section time nor exit velocity was affected significantly by start strategy, the fastest section time and exit velocity being attained with four and two V2 skate-pushes, respectively. In conclusion, these findings demonstrate that the start strategy exerts considerable impact on start performance on almost flat inclines, with strategies involving three or more V2 skate-pushes being optimal. In contrast, start performance on the steep incline was not influenced by strategy.