About the Authors

Pengjuan Liu

Roles Conceptualization, Formal analysis, Methodology, Software, Validation, Writing – original draft, Writing – review & editing

lpj@abtu.edu.cn

Affiliation School of Physics and Electronic-Electrical Engineering, Aba Teachers College, Wenchuan, China

Jindou Ma

Roles Supervision, Validation, Writing – review & editing

Affiliation Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China

Competing Interests

The authors have declared that no competing interests exist.