Funding for this research was provided by:
National Natural Science Foundation of China (51774323, 41502327)
The Fundamental Research Funds Project for the Central South University (2016zzts095)
The Open-End Fund for the Valuable and Precision Instruments of Central South University (CSUZC201801)
Article History
Received: 18 October 2018
Accepted: 7 March 2019
First Online: 28 March 2019