1. Department of Electrical Engineering, University of Las Palmas de Gran Canaria, Campus de Tafira s/n, 35017 Las Palmas de Gran Canaria, Spain
2. Department of Chemical Engineering and Pharmaceutical Technology, Faculty of Sciences-Section of Chemistry, University of La Laguna, 38200 San Cristóbal de La Laguna, Spain
3. Department of Mining, Topography and Structure Technology, Campus de Vegazana, Universidad de León, 24006 León, Spain