1. Department of Mechanical Engineering, ETSEQ-URV, Països Catalans, 26, 45002 Tarragona, Spain
2. Department of Electrical Engineering, ETSE-URV, Països Catalans, 26, 45002 Tarragona, Spain
3. Department of Physics Applied, ESEIAAT-UPC, Colom, 1, 08222 Terrassa, Spain
4. Department of Chemical Engineering, ESEIAAT-UPC, Colom, 1, 08222 Terrassa, Spain