Supported by the Guangdong Natural Science Foundation(S2012040007369);the Foundation for Distinguished Young Talents in Higher Education of Guangdong(2012LYM-0089)
Supported by the National Natural Science Foundation of China(71171103);Specialized Research Fund for the Doctoral Program of Zhanjiang Normal University(ZL1110)
Supported by the National Natural Science Foundation of China(10871086);the Specialized Research Fund for the Doctoral Program of Zhanjiang Normal University(ZL1102)