School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;