1. Department of Science and Chemical Engineering, University of Glamorgan, Pontypridd, Mid Glamorgan CF37 1DL, UK
2. Department of Mechanical and Manufacturing Engineering, University of Glamorgan, Pontypridd, Mid Glamorgan CF37 1DL, UK
3. Dip. Ing. Idraulica, Ambientale e del Rilevamento, Politecnico di Milano, via Fratelli Gorlini 1, 20151 Milano, Italy