Supported by Humanities and Social Sciences Project of the Ministry Education of China(13YJC630150;09YJC910004;10YJC630092);Natural Science Foundation of Shandong Province(ZR2010GL013);Research Program of Higher Education of Shandong Province(J10WF84);Natural Science Foundation of Shandong Province(ZR2012AQ013);Major Cultivation Project of Shandong Jiaotong University