Funding for this research was provided by:
National Natural Science Foundation of China (NO. 51401172)
Department of Science and Technology of Sichuan Province (No. 2015HH0012)
Fundamental Research Funds for the Central Universities (No. 2682014BR002)
2015 Cultivation Program for the Excellent Doctoral Dissertation of Southwest Jiaotong University
the program of the 2015 Doctoral Innovation Founds of Southwest Jiaotong University