1. Department
of Materials Engineering, Nagaoka National College of Technology, Nishi-Katakai,
Nagaoka, 940-2188, Japan
2. Aura-tec
Co.,
Ltd. 1725-2 Tsubuku-honmachi, Kurume, Fukuoka 830-0047, Japan
3. Environment Management Research Institute, AIST, Tsukuba, Ibaraki 305-8569, Japan