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*Wafaa Magdi Ali
Faculty of Science and Technology, Tokyo University of Science Solid State Physics Department, National Research Center
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F. A. Mahmoud
Solid State Physics Department, National Research Center
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E.T. El Shenawy
Solar Energy Department, National Research Centre
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S. A. Khairy
Department of Physics, Faculty of Science, Cairo University
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H. H. Hassan
Department of Physics, Faculty of Science, Cairo University
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Mutsumi Sugiyama
Faculty of Science and Technology, Tokyo University of Science