1. Department of Chemical and Process Engineering, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G11XJ, United Kingdom
2. Department of Mathematics, Manhattan College, Manhattan College Parkway, Riverdale, New York, New York 10471, USA
3. Department of Computer and Information Sciences, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York, New York 11210, USA