"Contribution of Muslims to Astronomy", Dept. of Physics, U.A.E. University,
Sept. 24, 1997
"Islamic Astronomy",Dept. of Astronomy, New Mexico State University (USA),
Oct. 04, 1994
"The Extragalactic Zoo", First Workshop on Astronomy at the National
Institute of Teachers, Laghouat (Algeria), May 25-26, 1994
"From Millimeters to Gamma-Rays Astronomy", First Workshop on
Astronomy at the National Institute of Teachers, Laghouat(Algeria), May 25-26, 1994
"Astronomy in Al-Andalus", Dept. of Physics, University of Blida (Algeria), Oct. 11, 1993
"VLA Imaging of Five-Fanaroff-Riley II 3CR Radio Galaxies", First Colloquium on
High Energy Physics & Astrophysics, University of Blida (Algeria), May 05-07, 1993
"Islamic Science Contribution to Civilization", Dept. of Physics, University of
Blida (Algeria), Feb. 10, 1993
"Radio Galaxies and Quasars: The Unified Scheme", Dept. of Physics, University
of Blida (Algeria), Nov. 16, 1992
"Jet/Counterjet Problem in Radio Galaxies and Quasars", Dept. of Astronomy, New
Mexico State University (USA), May 03, 1991
"Depolarization Asymmetry in the Quasar 3C47", A poster presented at the 176th
Meeting of the American Astronomical Society, Albuquerque, New Mexico (USA), June 10-14, 1990
"Artificially-Generated Atmosphere near a Lunar base", Space 88: Engineering, Construction, and Operations in Space, Albuquerque, New Mexico (USA), August 29-31, 1988