Supported by the National Natural Science Foundation of China under Grant No.10771022;Supported by FEDER Funds through"Programa Operacional Factores de Competitividade-COMPETE";Supported by Portuguese Funds through"Fundao para a Ciência e aTecnologia";within the Project PEst-C/MAT/UI0013/2011 and PTDC/MAT/112273/2009;Portugal