基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China (No.11247316, No.11247317, and No.11304408), the Science and Technology Research Project of Chongqing Education Committee (No.K J120613 and No.K J130607), and the Natural Science Foundation of Chongqing City (No.cstc2012jjA50019 and No.cstc2013jcyjA073a).