1. Faculty of Sciences of Gabès, University of Gabès, Cité Erriadh 6072 Gabès, Tunisia, Faculty of Sciences of Gafsa, Campus Universitaire Sidi Ahmed Zarroug, 2112 Gafsa, Tunisia, and Civil & Environmental Engineering, E/4130 Engineering Gate Way, University of California-Irvine, Irvine, California 92697-2175