第15届亚洲杯足球赛进球特征分析

通过对第15届亚洲杯足球赛复赛阶段16支队伍的32场比赛共87个进球特征进行分析,分析结果表明:本届杯赛进球数略高于上届;A区是进球的最佳区域;上半场前15min和下半场前15min以及后15min是进球最多的时间段;4次或4次以下的传球配合进球最多;中路进攻是本届杯赛的主要进攻途径;传球配合和定位球是本届杯赛中运用最多的技术;直接射门本届杯赛的主要射门方式,其中抢点射占有很大的比例。中国队在比赛中表现欠佳,与亚洲其他强队存在差距,特别是前四强,需要加大训练力度和目的性。     

表象训练对提高篮球命中率的影响

以安徽理工大学2000级篮球专项班学生为研究对象,采用对比实验法,对表象训练在篮球教学中的应用进行了尝试,获得了较理想的教学效果.     

两端固定弦振动问题的位相讨论

该文就两端固定弦振动问题的驻波解的位相做了进一步的探讨,有助于深入理解驻波解和振动解的物理意义。     

垂直激励圆柱形容器中的表面波特性研究

利用奇异摄动理论的两时间变量展开法，研究了垂直强迫激励圆柱形容器中的单一水表面驻波模式。假设流体是无粘、不可压且运动是无旋的，在忽略了表面张力的影响下，得到一个具有立方项以及底部驱动项影响的非线性振幅方程。对上述方程进行了数值计算，并研究了特定(3，4)模式的表面驻波结构和特性，如驻波的节点分布及随某些参数的变化规律等，从计算的等高线的图象来看，和以往的实验结果相当吻合。     

On the dynamic behavior of gas bubbles in an inhomogeneous standing wave

The motion of gas bubbles in an inhomogeneous standing wave is examined. The nonlinear system of equations is solved by the averaging method. Stationary solutions (bubble clusters) are found, and the conditions for their stability are established __________ Translated from Prikladnaya Mekhanika, Vol. 42, No. 5, pp. 88–94, May 2006.     

巧解铅球最佳出手角

利用运动叠加原理通过对铅球运动的恰当分解, 提出了一种计算最佳出 手角的新方法, 并与传统方法就两种不同情形进行了对比, 说明了新方法的物理思想.     

奖牌榜的启示

本文根据重大体育赛事特别是奥运会和全运会奖牌分布对各代表团排名的影响，分析了各类奖牌尤其是金牌的价值权重规律。从分析雅典奥运会奖牌带入十运会对十运会奖牌榜的影响入手，预测了2005年十运会各省市代表团的排名次序，给备战全运会的各省市运动队和运动员了解自身所处的位置提供了重要的启示。     

一类Hysteresis函数的微分(英文)

1 IntroductionThe theory of hysteresis operators developed in the past 20 years has pro-ved to be a powerful tool fOr solving mathematical probIems in various bran-ches of applications such as solid mechanics, material fatigue, ferromagnetism,phase tIansitbo, and many others. Many models Qf hysteresis operator havebeen constructed (see [1]--[4]). Since hysteresis operators make some good cha-racters (include differentiability) of functional sustain destruction, hysteresisfunctionals are not …     

Error analysis of the L2 least‐squares finite element method for incompressible inviscid rotational flows

In this article we analyze the L² least‐squares finite element approximations to the incompressible inviscid rotational flow problem, which is recast into the velocity‐vorticity‐pressure formulation. The least‐squares functional is defined in terms of the sum of the squared L² norms of the residual equations over a suitable product function space. We first derive a coercivity type a priori estimate for the first‐order system problem that will play the crucial role in the error analysis. We then show that the method exhibits an optimal rate of convergence in the H¹ norm for velocity and pressure and a suboptimal rate of convergence in the L² norm for vorticity. A numerical example in two dimensions is presented, which confirms the theoretical error estimates. © 2004 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2004     

Multiplicity and stability of standing waves for the nonlinear Schrödinger‐Poisson equation with a harmonic potential

In this paper, we study the multiplicity, stability, and quantitative properties of normalized standing waves for the nonlinear Schrödinger‐Poisson equation with a harmonic potential.