1. Department of Mechanical Engineering; Polytechnic Institute of Coimbra/Coimbra Institute of Engineering; Rua Pedro Nunes, Quinta da Nora 3030-199 Coimbra Portugal
2. CEMUC - Centre for Mechanical Engineering of the University of Coimbra; Pinhal de Marrocos 3030-788 Coimbra Portugal
3. Department of Civil Engineering, Architecture and Geo-resources; University of Lisbon/Instituto Superior Técnico; Avenida Rovisco Pais 1049-001 Lisbon Portugal
4. Department of Electrical Engineering; Polytechnic Institute of Coimbra/Coimbra Institute of Engineering; Rua Pedro Nunes, Quinta da Nora 3030-199 Coimbra Portugal