1. Faculty of Engineering-FEG; Universidade Estadual Paulista-UNESP; Guaratinguetá 12516-410 SP Brazil
2. Institute of Physics-IFGW; State University of Campinas-UNICAMP; Campinas 13083-859 SP Brazil
3. Institute of Science and Technology-ICT; Universidade Estadual Paulista-UNESP; São José dos Campos 12245-000 SP Brazil