About the Authors
- Jun Tang
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* E-mail: tjuns1979@126.com
Affiliation College of Science, China University of Mining and Technology, Xuzhou, China
- Jin-Ming Luo
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Affiliation College of Science, China University of Mining and Technology, Xuzhou, China
- Jun Ma
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Affiliation Department of Physics, Lanzhou University of Technology, Lanzhou, China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: JT. Performed the experiments: JT JL JM. Analyzed the data: JT JL JM. Wrote the paper: JT.