基金Supported by the National Natural Science Foundation of China under Grant No.10771022Supported by FEDER Funds through"Programa Operacional Factores de Competitividade-COMPETE"+2 种基金Supported by Portuguese Funds through"Fundao para a Ciência e aTecnologia"within the Project PEst-C/MAT/UI0013/2011 and PTDC/MAT/112273/2009Portugal