1. Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania
2. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an Shaanxi China
3. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China
4. Faculty of Materials Science and Chemistry China University of Geosciences Wuhan Hubei China