Funding for this research was provided by:
the Project Supported by Graduate Student Research and Innovation Foundation of Chongqing (CYB17026)
National Natural Science Foundation of China (61572089,61633005, 61472464)
Natural Science Foundation of Chongqing Science and Technology Commission (cstc2017jcyjBX0008, cstc2014jcyjA40030, cstc2015jcyjA40039)
Fundamental Research Funds for the Central Universities (106112017CDJQJ188830, 106112017CDJXY180005, 106112014CDJZR185501)
Article History
Received: 25 July 2017
Revised: 18 January 2018
Accepted: 24 January 2018
First Online: 3 February 2018