The distribution of the 2-th weighted mean of Dirichlet L-functions was discussed using definition of the Dirichlet L-function,property of the character sum and their analytic methods,and an interesting mean value distribution formula was given.

The main purpose of this paper is using the definition of the Dirichlet L-function、the property of char acter sum and the analytic method to study the distribution of the 4-th weighted mean of L-functions,and give an interesting mean value distribution formula.

The main purpose of this paper is to use the definition of the Dirichlet L-function、the estimation of character sum and the analytic method to study the distribution of the 4-th weighted mean of Dirichlet L-functions,and to give an interesting mean value distribution formula.

It also puts forward a security model for distributive campus network accordingly.

Based on 3S techniques and combined with the ground review,this study analyzed the orchard landscape structure of 12 typical basins in Yantai City by using the classified principle in the land use map of 1996 to interpret the Land-sat TM image of Sep.

The paper mainly introduces the location,landscape resource situation and major scenic spots of watershed forest park of Xuanwei city,which belongs to provincial forest park.