1. State Key Lab of Electrical Insulation and Power Equipment
2. School of Electrical Engineering
3. Xi'an Jiaotong University
4. Xi'an 710049
5. P. R. China
6. School of Materials Science and Engineering
7. Tongji University
8. Shanghai 201804
9. China
10. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering
11. Massachusetts Institute of Technology
12. Cambridge
13. USA
14. Department of Materials Science and Engineering
15. Stanford University
16. Stanford
17. Stanford Institute for Materials and Energy Sciences