Badawy, W. A.,
"“Universal Energy Situation and Different Approaches for Renewable Energy "",
Brandenburgische Technische Universitaet Cottbus, Germany, August 25, 2008. , Technische Universitaet Cottbus, Germany, 25 August, 2008.
Badawy, W. A.,
"“Universal Energy Problems and new aspects of solutions - Porous Si layers on Si as alternative for high efficiency solar cells” ",
Humboldt-Kolleg "Green Chemistry for Clean Environment", Ismailia, Egypt, October,26-29, 2010. , Ismailia, Egypt, 26 October, 2010.