1. Mechanical Engineer, Baker Huges, a GE company, Via F. Matteucci 2, Florence 50127, Italy e-mail:
2. Senior Mechanical Engineer, Baker Huges, a GE company, Via F. Matteucci 2, Florence 50127, Italy e-mail:
3. DICI, Università di Pisa Largo, Lucio Lazzarino 2, Pisa 56126, Italy e-mail:
4. Professor DICI, Università di Pisa Largo Lucio, Lazzarino 2, Pisa 56126, Italy e-mail: