1. Materials
Science Research Laboratory, Central Research Institute of Electric Power Industry, 2-11-1 Iwado Kita, Komae, Tokyo 201-8511, Japan
2. DAISO CO., 9 Ohtakasu-cyo, Amagasaki, Hyogo 660-0842, Japan
3. Electric Power Engineering Systems Co., 2-11-1 Iwado-kita, Komae, Tokyo 201-8511, Japan