GHOUGALI LEVRES Laboratory Physics Departement Faculty of Exact Sciences University of El-Oued B.P. 789, El-Oued 39000, Algeria. Email : [email protected] Email : [email protected] Tel: +213 663 24 43 00. DATE AND PLACE OF BIRTH: 05/15/1979 in Ghamra-Meggarine Algerian nationality FAMILY STATUS: Married