Through using the method of literature review,mathematical statistics,from the mean value characteristic,the position mean value characteristic and the structure characteristic,this paper makes deeply analysis on five parameters:the age,times for competition,height,weight and the gram request Lai index of the football players in 2008 European Cup.

Angular momentum, mechanical energy and Runge-Lenz vector are conservation in inverse-square central force field.

Analysis on secondary stress field characters of hard surrounding rock in large underground caverns by elasto-brittle-plastic constitutive models;

Taking the underground powerhouse in a huge hydropower station as an example,the authors studied distribution pattern of the secondary stress field of surrounding rock mass with nonlinear finite element method of the large-spaned underground powerhouse with high side wall and evaluated the stability of surrounding rocks.