1. Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima 739-8527, Japan
2. Department of Physics, Institut Teknologi Bandung, Jl. Ganesha no 10, Bandung 40132, Indonesia
3. Department of Chemical Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan