1. Centre for Advanced Research of Energy and Materials Faculty of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
2. Graduate School of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
3. Marketing and Sales Unit, Analysis, Testing and Research Business, Kobelco Research Institute, Inc., 1-11-2 Osaki, Shinagawa-ku, Tokyo 141-0032, Japan