1Mechanical and Thermal Measurements Laboratory, Department of Mechanical and Aerospace Engineering, “Sapienza” University of Rome, Via Eudossiana, 18 – 00184 Rome – Italy; PH (+39) 0644585558; FAX: (+39) 0644585250
2Department of Astronautical, Electrical and Energetic Engineering, “Sapienza” University of Rome, Via Eudossiana, 18 – 00184 Rome – Italy
3Orhtopedy and Traumatology Area, University "Campus Bio-Medico", Via Álvaro del Portillo, 21 – 00128 Rome - Italy