Supported by National Natural Science Foundation of China(11271020 and 11201004);Key Project of Chinese Ministry of Education(211077);Anhui Provincial Natural Science Foundation(10040606Q30;1208085MA11)
Supported by National Natural Science Foundation of China(10871217);Projects of Science and Technology Research of Chongqing City Education Committee(KJ1307XX)
Supported by the National Natural Science Foundation of China (10901003);the Key Project of Chinese Ministry of Education (211077);the Anhui Provincial Natural Science Foundation(1208085MA11)