TOPSIS法在企业前台竞争力评价中的应用

把企业竞争力分为企业前台竞争力与核心竞争力两个层次,企业前台竞争力是企业核心竞争力的结果表现,通过对前台竞争力的评价分析,可以使管理者很容易弄清楚本企业的核心竞争力水平和在本行业中所处的地位,且易于识别。通过构建前台竞争力评价指标体系,运用TOPSIS法对企业前台竞争力进行评价分析,为进一步评价及提升企业核心竞争力提供依据。     

Comparing the magnitude and direction of asymmetry during the squat,countermovement and drop jump tests in elite youth female soccer players

ABSTRACT

The aims of the present study were to provide an in-depth comparison of inter-limb asymmetry and determine how consistently asymmetry favours the same limb during different vertical jump tests. Eighteen elite female under-17 soccer players conducted unilateral squat jumps (SJ), countermovement jumps (CMJ) and drop jumps (DJ) on a portable force platform, with jump height, peak force, concentric impulse and peak power as common metrics across tests. For the magnitude of asymmetry, concentric impulse was significantly greater during the SJ test compared to CMJ (p = 0.019) and DJ (p = 0.003). No other significant differences in magnitude were present. For the direction of asymmetry, Kappa coefficients revealed fair to substantial levels of agreement between the SJ and CMJ (Kappa = 0.35 to 0.61) tests, but only slight to fair levels of agreement between the SJ and DJ (Kappa = ?0.26 to 0.18) and CMJ and DJ (Kappa = ?0.13 to 0.26) tests. These results highlight that the mean asymmetry value may be a poor indicator of true variability of between-limb differences in healthy athletes. The direction of asymmetry may provide a useful monitoring tool for practitioners in healthy athletes, when no obvious between-limb deficit exists.     

无约束优化问题的修正WYL共轭梯度法及其收敛性质

在相关文献的基础上，提出无约束优化问题的修正WYL共轭梯度法，该方法不依赖于任何线搜索而满足充分下降性，证明了采用Arimijo型线搜索算法的全局收敛性，及在适当条件下算法具有R-线收敛速率，证明了采用重开始策略时算法具有n步二次收敛性。     

新时期大学生思想政治教育工作方法研究

针对当前由＂90后＂构成的大学生主体,总结了其相对于＂80后＂所呈现出的新特点,提出了新时期大学生思想政治教育工作,应从完善与学生的沟通途径、构建与家长的全方位沟通机制、营造和谐的集体氛围、打造良好的社会环境四方面进行。     

TPR技术对钒系催化剂供氧活性和数目的研究

本文报导了利用TPR技术研究钒系催化剂的供氧活性和数目,从而阐明了TPD平衡法的可靠性.     

非英语专业大学英语课堂的双语运用

章从理论和实践等方面阐述了在大学中非英语专业课堂上运用双语教学的必要性，双语即英语和汉语，无论是从输入假说的理论，还是从课堂上学生的理解效果看，双语教学都更有助于学生对所学内容的透彻理解。     

Global convergence or national variation? Examining national patterns of classroom instructional practices

The world culture framework posits a convergence in the organisation of education across the world. On the other hand, scholars observing teaching practices inside classrooms find significant variation among nations and regions of the world. This study examined the global change patterns of classroom practices at the between- and within-country levels, drawing on teacher reports from the Trends in Mathematics and Science Study. Results indicate clear between-country convergence toward more student-centred and conceptual instruction. But a nation’s degree of conformity or resistance to this model was contingent upon other nation-specific factors, including centralised curriculum control or world regional location.     

TiNYT15涂层车刀刀具使用寿命实验研究

本文主要介绍了用阶梯切削法来建立YT15氮化钛涂层车刀的刀具使用寿命计算公式方法,并对涂层刀具和未涂层刀具的切削数据进行了处理和比较,进一步从理论上和实验上论证了涂层刀具的使用寿命远高于未涂层刀具的事实。     

基于BP神经网络的大学生实践教学效果评价研究

实践教学是高等学校教学工作的重要组成部分,其中实践教学效果评价是保障高等学校实践教学质量的重要环节。针对高校大学生项目实践教学效果评价需求,构建项目实践教学效果评价指标体系,在此基础上设计调查问卷,利用网络问卷收集评价原始数据,通过Python进行数据预处理,并采用BP神经网络对某高校大学生项目实践教学效果实施评价,结果表明,该方法对于高校实践教学效果评价具有较强的实用性。     

非线性多变延迟奇异摄动问题的稳定性分析

讨论了形如x′(t) =f(x(t) ,x(t -τ1(t) ) ,… ,x(t -τm(t) ) ,y(t) ,y(t -τ1(t) ) ,… ,y(t-τm(t) ) )和εy′(t) =g(x(t) ,x(t -τ1(t) ) ,… ,x(t -τm(t) ) ,y(t) ,y(t -τ1(t) ) ,… ,y(t -τm(t) ) ) (0 <ε 1)的非线性多变延迟奇异摄动系统的理论解的稳定性 ,得到了系统稳定的一个充分条件 .在此条件下还证明了隐式Euler方法的数值解是稳定的 .