Affiliation: | 1. Department of Environmental Technologists, Technological Education Institute (TEI) of the Ionian Islands, GR-29100 Zakynthos, Greece;2. Department of Electronics Engineering, Piraeus University of Applied Sciences (TEI of Piraeus), 250 Thivon & P. Ralli, GR-12244, Aigaleo, Athens, Greece;3. Department of Physics, Section of Solid State Physics, University of Athens, Panepistimiopolis Zografos, GR-15784 Athens, Greece |