Affiliation: | 1. Department of Physics, Gansu Normal University for Nationalities, Hezuo, China.;2. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, China.;3. Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing, China.;4. Department of Chemistry, Gansu Normal University for Nationalities, Hezuo, China. |