1. Centre for Electrochemistry and Intelligent Materials (CEMI); Universidad Politécnica de Cartagena, Aulario II, Paseo Alfonso XIII; E-30203 Cartagena (Murcia) Spain
2. Kyushu Institute of Technology; Department of Mechanical Information Science and Technology; 680-4 Kawazu Iizuka (Fukuoka) 820-8502 Japan
3. Electronics department; Engineering school; Universidad Autónoma del Estado de México; Toluca E-50130 Mexico