1. Graduate School of Chemical Sciences and Engineering
2. Hokkaido University
3. Sapporo 060-8628
4. Japan
5. Faculty of Engineering
6. Department of Physics
7. Tokyo Metropolitan University
8. Hachioji
9. Department of Physical Science
10. Hiroshima University
11. Higashihiroshima
12. Materials and Structures Laboratory
13. Tokyo Institute of Technology
14. Yokohama 226-8503
15. State Key Laboratory of Coal Conversion
16. Institute of Coal Chemistry
17. Chinese Academy of Sciences
18. Taiyuan 030001
19. P. R. China
20. Department of Chemistry
21. School of Science
22. Meguro-ku