1. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
2. School of Natural and Applied Science, Northwestern Polytechnical University, Xi’an 710072, China
3. Department of Physics, “Alexandru Ioan Cuza” University of Iasi, Iasi 700506, Romania
4. School of Science, Xijing University, Xi’an 710123, China