基于分层构权主成分分析的皖北地下水水质评价研究

针对皖北地下水水质评价,以水文地质调查数据以及取样分析结果为依据,在主成分分析的基础上,构造分层构权主成分分析评价法,并借助Arc GIS描述地下水水质区域差异性。结果表明:分层构权主成分分析方法较传统主成分分析法更具有针对性和区分度,特别针对F-含量高的地下水,可靠性和准确度更高。针对皖北地区地下水水质,东部整体优于西部,其中泗县-灵璧-宿州-雌溪一带地下水水质较好,符合饮用水卫生标准;颍上-阜南-阜阳-临泉-界首-太和一带和砀山-淮北一带属于高氟地下水区域,应采取适宜的降氟措施方可作为饮用水水源,而固镇、蒙城地区地下水受TDS、Cl-和TH含量影响,地下水水质较差,不宜作为饮用水水源。     

Fresnel圆屏衍射的计算机模拟演示

基于Huygens-Fresnel衍射积分和Babinet原理,利用Hankel变换算法及球面波因子处理方法,在普通PC上使用MFC编程较好地实现了Fresnel圆屏衍射的计算机模拟演示。演示中,Fresnel圆屏衍射的光强剖面分布、衍射图样和中心光强分布分别随光的传输距离和波长及圆屏半径的改变而变化,光的传输距离和波长及圆屏半径由三个滚动条分别控制。     

苏浙沪皖大中型工业企业科技创新绩效比较分析

随着知识经济的发展,科技创新在提升地区经济与企业市场竞争力中发挥出越来越重要的作用,逐步成为实现区域经济发展的助推器.作为"泛长三角地区"重要组成部分的苏浙沪皖三省一市,其大中型工业企业在科技创新绩效上处于不平衡发展状态.通过实证分析得出的科技创新能力得分,认为加速产业集群建设、加大政府和商业银行扶持力度以及构建多层次...     

海南省年降水量的年际变化和特征分析

本文应用主分量分析方法对海南省的年降水量、年降水平均值、标准差和距平百分率进行统计分析结果发现，前5个分量可表示降水总方差的83％，它已反映出年降水场最重要的特征。时间系数和特征向量的组合，将年降水场分为5种类型，并确定了海南省逐年降水量的类型，全省性旱和涝的几率最高，占58％，其次是东南旱西涝，占17％。     

委托代理理论下我国学校体育场地对外开放策略

为解决人民健身需求增长与体育场地资源不足的矛盾,以委托代理理论为理论基础对我国学校体育场地对外开放问题进行研究。认为当前我国学校体育场地对外开放面临管理主体责任划分不明晰、安全保障体系不健全、专业化服务不到位等困境,而委托代理理论可以提供解决思路。在构建学校体育场地对外开放管理模式的基础上,提出开放策略：建立完善的法律体系和有效的协调机制;加强管理,营造安全的健身环境;构建“互联网+”专业服务平台,提供优质服务。旨在为推动我国学校体育场地对外开放和更好地服务于全民健身提供依据。     

The application of inertial measurement units and functional principal component analysis to evaluate movement in the forward 3½ pike somersault springboard dive

Based on technological and analytical advances, the capability to more accurately and finitely examine biomechanical and skill characteristics of movement has improved. The purpose of this study was to use Inertial Measurement Units (IMUs) and Functional Principal Components Analysis (fPCA) to examine the role of movement variability (assessed via angular velocity), on 2 divers (1 international level; 1 national) performing the forward 3½ pike somersault dive. Analysis of angular velocity curves during ive-flight identified 5 fPCs, accounting for 96.5% of movement variability. The national diver’s scatter plots and standard deviation of fPC scores illustrated larger magnitudes of angular velocity variability across dive flight. For fPC1 and fPC3, magnitudes of SD variability were 282.6 and 201.5, respectively. The international diver illustrated more consistent angular velocity profiles, with clustering of fPCs scores (e.g., fPC1 & 3 = SD’s of 75.2 & 68.0). To account for lower variability in the international diver, the ability to better coordinate movement sequences and functionally utilise feedback in response to initiation of the somersault position is highlighted. Overall, findings highlight how both IMUs and fPCA can more holistically and finitely examine the biomechanical and skill characteristics of movement sequences with the capability to inform athlete development.     

n元二次型特征方程的求法

给出了求n元二次型特征方程的一个重要定理,用代数方法解决了几何问题,并给出几个应用实例。     

Girls’ bodily activities in physical education How current fitness and sport discourses influence girls’ identity construction

Girls’ identity constructions are influenced by the dominant sport, health and beauty discourses in their society. Recent research indicates that sport and health discourses embedded in physical education (PE) compete for influence. Some of these studies have illustrated how these discourses inform girls’ social construction of body ideals and femininities, as well as their choices among physical activities. Our purpose in posing the question, ‘How are girls’ identity construction in PE influenced by current fitness and sport discourses?’ is to explore their identity construction and how they negotiate within the PE discourse as embodied subjects, as well as how they use their body as an object of display. This study is based on fieldwork among 10th grade students (15-year-olds) in a school in Oslo, Norway. The methods used include participant observation, informal conversations with the students and two group interviews. We hope that our findings concerning how sport and fitness discourses influence the students’ concepts of both the ideal body and their choices among bodily activities in PE will contribute to the debate on the future of PE. In particular, the girls’ embrace of the fitness discourse in PE is relevant to a question of great current concern: How should schools and PE teachers meet and relate to the fitness discourse in contemporary society? We believe that if left unchallenged and permitted to deepen its influence on PE, this discourse may well ensure that body modification becomes the primary purpose of PE.     

主成分分析方法在体育用品制造业经济效益评价中的应用

为了解我国体育用品制造业经济效益的发展状况,利用主成分分析方法对体育用品制造业和其他有代表性的产业进行经济效益评价.结论是目前体育用品制造业的经济效益水平在比较的7个产业中,位于中下等水平.