1. Department of Applied Science and Technology; Politecnico di Torino; Corso Duca degli Abruzzi 24 Torino 10129 Italy
2. School of Engineering and Technology; University of Hertfordshire; Hatfield Herts AL10 9AB UK
3. Department of Industrial Engineering; Universita' degli Studi di Padova; Via Marzolo 9 Padova 35131 Italy
4. Department of Geosciences; Universita' degli Studi di Padova; Via Gradenigo 6 Padova 35131 Italy
5. Edison Research & Development Center; Edison S.p.A.; Trofarello Torino Italy