The project was supported by the National Natural Science Foundation of China(No.20871107);He'nan Outstanding Youth Science Fund(No.0612002700);the Natural Science Foundation of the Education of Henan province(No.2009A150031)
The project supported by the National Natural Science Foundation of China(No.20871107);Henan Outstanding Youth Science Fund(No.0612002700);the Natural Science Foundation of the Education Department of Henan Province(No.2009A150031)