基金The National Natural Science Foundation of China(51072008,51172006)the Natural Science Foundation of Beijing(2102006)+3 种基金the Project of New Star of Science and Technology of Beijing(2007A014)the Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing MunicipalityPHR(IHLB)(PHR201008012,201007101)the Postgraduate Science and Technology Foundation of Beijing University of Technology(ykj-2011-6371)