1. School of Automation Engineering
2. University of Electronic Science and Technology of China
3. Chengdu 611731
4. P. R. China
5. State Key Laboratory of Rare Earth Resource Utilization
6. Changchun Institute of Applied Chemistry
7. Chinese Academy of Sciences
8. Changchun 130022
9. School of Basic Sciences
10. Changchun University of Technology
11. Changchun 130012