Funding for this research was provided by:
National Natural Science Foundation of China (No. 51604308)
Postgraduate Independent Exploration and Innovation project of Hunan Province (No. CX20190231)
Key Research and Development Projects of Hunan Province (2018WK2012)
Fundamental Research Funds for Central Universities of the Central South University (No. 2019zzts175)
Article History
Received: 6 February 2020
Revised: 15 June 2020
Accepted: 30 June 2020
First Online: 29 July 2020