It has been approved to form the discussion committee for discussing the master thesis of the student\ Mohamed Fadel Tulba as following; Prof. Dr. Mohamed Qassim Khalifa, Prof. Dr. Abou Bakr Abd El Wahab, Prof. Dr. Sedeeq Abd El Aziz Sedeeq, Prof. Dr. Mohamed Hany Tag El Din and Prof. Dr. Nasser khamis El Gizawey.