1. a Faculty of Physics , “Al. I. Cuza” University , 11, Carol I Bd., Iasi, 6600, Romania
2. b Faculty of Automatic Control and Computer Engineering , “Gh.Asachi” Technical University , 53A, D. Mangeron Bd., Iasi, 6600, Romania
3. c “Victoria” High School , 41–43 Socola Street, Iasi, 6600, Romania