[1] Univ Guayaquil, Univ Valladolid UVA, Fac Chem Engn, PhD Sch, Guayaquil 593, Ecuador
[2] Univ Valladolid UVA, Dept Agr Engn & Forestry, Campus Univ, Duques De Soria 42004, Soria, Spain
[3] Univ Valladolid UVA, Dept Elect Engn, Escuela Ingn Ind, Paseo Cauce 59, Valladolid 47011, Spain
[4] Univ Verzcruzana, Zona Univ, Unidad Ingn & Ciencias Quim, Xalapa 91000, Veracruz, Mexico