supported by National Natural Science Foundation of China(NSFC)under Grant No.61370090;the Key Project of Chinese Ministry of Education under Grant No.211080;the Talent Project of the Anhui Province for Outstanding Youth under Grant:2013SQRL064ZD;the Natural Science Foundation of Anhui Province under Grant No.1408085MA20;the Key Program of Research Base of Hefei Normal University under Grant No.2012jd13