National Natural Science Foundation of China(51008272 and 50838008);National Basic Research Program of China(2009CB623200);National High Technology Research and Development Program of China(2012AA050903);Scientific and Technological Research Development Projects of Ministry of Railways(J2011G004);the Key Science and Technology Innovation Team of Zhejiang Province(2010R50034);Research Fund for the Doctoral Program of Higher Education of China(20100101120061)