1. Industrial Membranes Development Department, Asahi Chemical Industries Co., Ltd., 2-1, Samejima, Fuji, Shizuoka, 416-8501 Japan
2. Fuji Electric Corporate Research and Development, Ltd., 2-2-1, Nagasaka, Yokosuka, Kanagawa, 240-0194 Japan
3. Faculty of Engineering Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527 Japan