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Shaltout, I., and Y. Badr, "Effects of Sm3+/Yb3+co-doping and temperature on the Raman, IR spectra and structure of [TeO2-GeO2-K2O-Sm2O3/Yb2O3] glasses", Physica B: Condensed Matter, vol. 381, no. 1-2, pp. 187-193, 2006. AbstractWebsite
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Shamah, A. M., S. Ahmed, R. Kamel, and Y. Badr, "Structural changes of ((NH4)1–xKx)2SO4 crystals", physica status solidi (a), vol. 100, no. 1, pp. 115-119, 1987. AbstractWebsite
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Soliman, W., S. El-Ansary, and Y. Badr, "Optical characterization of one-step synthesis of ternary nanoalloy by laser ablation of stainless steel target in Hexane", Optics and Laser Technology, vol. 97, pp. 41-45, 2017. AbstractWebsite
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Solouma, N. H., A. - B. M. Youssef, Y. A. Badr, and Y. M. Kadah, "Robust computer-assisted laser treatment using real-time retinal tracking", Annual Reports of the Research Reactor Institute, Kyoto University, vol. 3, pp. 2499-2502, 2001. Abstract
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Solouma, N. H., A. - B. M. Youssef, Y. A. Badr, and Y. M. Kadah, "Real-time retinal tracking for laser treatment planning and administration", Proceedings of SPIE - The International Society for Optical Engineering, vol. 4322, no. 3, pp. 1311-1321, 2001. Abstract
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Solouma, N. H., A. - B. M. Youssef, Y. A. Badr, and Y. M. Kadah, "A new real-time retinal tracking system for image-guided laser treatment", IEEE Transactions on Biomedical Engineering, vol. 49, no. 9, pp. 1059-1067, 2002. AbstractWebsite
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Taha, H. M., N. El-Bendary, A. E. Hassanien, Y. Badr, and V. Snasel, "Retinal feature-based registration schema", Communications in Computer and Information Science, vol. 252 CCIS, no. PART 2, pp. 26-36, 2011. AbstractWebsite
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Tharwat, C., M. A. Swillam, Y. Badr, S. M. Ahmed, I. K. Bishay, F. A. Sadallah, and E. A. ElSaid, "Novel optical technique for 2D graphene reduction", Proceedings of SPIE - The International Society for Optical Engineering, vol. 10100, 2017. Abstract
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Tomaszewski, P. E., "Comments on the “effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4” by Badr and El-Guiziri", Journal of Physics and Chemistry of Solids, vol. 51, no. 12, pp. 1433 -, 1990. AbstractWebsite
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Umavathi, J. C., "Free convective flow in a vertical rectangular duct filled with porous matrix for viscosity and conductivity variable properties", International Journal of Heat and Mass Transfer, vol. 81, pp. 383 - 403, 2015. AbstractWebsite

Abstract Free convection over a vertical rectangular duct filled with porous matrix with variable viscosity and variable thermal conductivity is studied in this paper. We consider the two-dimensional steady laminar flow and Brinkman–Forchheimer extended Darcy model to define the porous medium. Using the appropriate variables the basic governing equations are transformed to non-dimensional governing equations. The fluid viscosity is assumed to vary exponentially with temperature whereas the thermal conductivity is assumed to vary linearly with temperature. One of the vertical walls of the duct is cooled with constant temperature while the other wall is heated to constant but different temperature. The governing coupled nonlinear momentum and energy equations are solved numerically using finite difference method. The effect of pertinent parameters such as variable viscosity, variable thermal conductivity, Darcy number, inertial parameter, Grashof number, Brinkman number and aspect ratio on the velocity, temperature, volumetric flow rate, shear stress and heat transfer are discussed.