1. Sr. Lect., Dept. of Chemical Engrg., Univ. of Calcutta, 92 A.P.C. Rd., Calcutta-700009, India; currently, Visiting Postdoctoral Fellow, Dept. of Mech. Engrg. and Energy Processes, Southern Illinois Univ. at Carbondale, Carbondale, IL 62901; corresponding author. E-mail: chaudhur@micro.siu.edu
2. Res. Scholar, Dept. of Chemical Engrg., Univ. of Calcutta, 92 A.P.C. Rd., Calcutta-700009, India.