1. Graduate School of Engineering, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan, Crystal Growth Centre, Anna University, Chennai 600 025, India, Research Institute for Applied Mechanics, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan, and Toyota Technological Institute, 2-12-1, Hisakata, Tempaku-ku, Nagoya 468-8511, Japan