Publications

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Journal Article
Badr, Y., and M. A. Mahmoud, "Effect of PbS shell on the optical and electrical properties of PbSe core nanoparticles doped in PVA", Physica B: Condensed Matter, vol. 388, no. 1-2, pp. 134-138, 2007. AbstractWebsite
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Badr, Y., and M. A. Mahmoud, "Effect of PVA surrounding medium on ZnSe nanoparticles: Size, optical, and electrical properties", Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, vol. 65, no. 3-4, pp. 584-590, 2006. AbstractWebsite
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Badr, Y., and M. A. Mahmoud, "Effect of silver nanowires on the surface-enhanced Raman spectra (SERS) of the RNA bases", Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, vol. 63, no. 3, pp. 639-645, 2006. AbstractWebsite
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Badr, Y. A., F. El‐Kabbany, G. Said, and O. W. Saleh, "Effect of the internal motion of NH 4+ on the properties of some halides", physica status solidi (a), vol. 60, no. 1, pp. 297-301, 1980. AbstractWebsite
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Badr, Y. A., and S. B. El-Guiziri, "Effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4", Journal of Physics and Chemistry of Solids, vol. 50, no. 12, pp. 1261 - 1264, 1989. AbstractWebsite

Polycrystalline lithium-ammonium sulphate samples were subjected to X-ray diffraction analysis for determining the lattice parameters of the prepared mixed crystals. The compositions of the samples were determined using X-ray microanalysis. The Li0.5(NH4)0.5SO4 samples were irradiated with different doses of γ-radiation in order to investigate the effect of this ionizing radiation on the phase transition temperatures Tc1 and Tc2. The temperature dependence of the d.c. resistivity ρd.c. and dielectric constant ϵ of irradiated samples showed (i) a shift of Tc1 to higher temperatures; (ii) a shift of Tc2 to lower temperatures; and (iii) the appearance of a new anomaly near 128°C at moderately high γ-doses. The mechanisms giving rise to this behaviour are discussed.

Badr, Y. A., and S. B. El-Guiziri, "Effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4", Journal of Physics and Chemistry of Solids, vol. 50, no. 12, pp. 1261 - 1264, 1989. AbstractWebsite

Polycrystalline lithium-ammonium sulphate samples were subjected to X-ray diffraction analysis for determining the lattice parameters of the prepared mixed crystals. The compositions of the samples were determined using X-ray microanalysis. The Li0.5(NH4)0.5SO4 samples were irradiated with different doses of γ-radiation in order to investigate the effect of this ionizing radiation on the phase transition temperatures Tc1 and Tc2. The temperature dependence of the d.c. resistivity ρd.c. and dielectric constant ϵ of irradiated samples showed (i) a shift of Tc1 to higher temperatures; (ii) a shift of Tc2 to lower temperatures; and (iii) the appearance of a new anomaly near 128°C at moderately high γ-doses. The mechanisms giving rise to this behaviour are discussed.

Badr, Y. A., and S. B. El-Guiziri, "Effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4", Journal of Physics and Chemistry of Solids, vol. 50, no. 12, pp. 1261-1264, 1989. AbstractWebsite
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Abdelsalam, E., M. Samer, Y. A. Attia, M. A. Abdel-Hadi, H. E. Hassan, and Y. Badr, "Effects of Co and Ni nanoparticles on biogas and methane production from anaerobic digestion of slurry", Energy Conversion and Management, vol. 141, pp. 108-119, 2017. AbstractWebsite
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Salah, A., A. Mansour, M. B. Mohamed, I. M. Azzouz, S. Elnaby, and Y. Badr, "Effects of nanoparticles size and concentration and laser power on nonlinear optical properties of Au and Au-CdSe nanocrystals", Applied Surface Science, vol. 353, pp. 112-117, 2015. AbstractWebsite
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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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Graça, M. P. F., H. Fawzy, Y. Badr, M. M. Elokr, C. Nico, R. Soares, L. C. Costa, and M. A. Valente, "Electrical, dielectric and structural properties of borovanadate glass systems doped with samarium oxide", Physica Status Solidi (C) Current Topics in Solid State Physics, vol. 8, no. 11-12, pp. 3107-3110, 2011. AbstractWebsite
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Badr, Y., and M. A. Mahmoud, "Enhancement of the optical properties of poly vinyl alcohol by doping with Silver nanoparticles", Journal of Applied Polymer Science, vol. 99, no. 6, pp. 3608-3614, 2006. AbstractWebsite
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Battisha, I. K., M. A. Salem, A. M. S. Nahrawy, Y. Badr, B. Elouady, and M. Kamal, "Erbium activated monolith silica-phosphate glasses planar waveguide and up-conversion mechanism", International Journal of Nano and Biomaterials, vol. 2, no. 1-5, pp. 191-203, 2009. AbstractWebsite
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Badr, Y., and M. A. Mahmoud, "Excimer laser photofragmentation of metallic nanoparticles", Physics Letters, Section A: General, Atomic and Solid State Physics, vol. 370, no. 2, pp. 158-161, 2007. AbstractWebsite
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Badr, Y. A., M. I. Youssif, T. El-Sherbini, and D. Hassan, "Fabrication and characterization of superconducting nano layer by pulsed laser deposition", Life Science Journal, vol. 13, no. 5, pp. 8-20, 2016. AbstractWebsite
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Hammad, T., F. El‐Kabbany, and Y. Badr, "Ferroelectric and dielectric properties of thin NaNO2 layers", physica status solidi (a), vol. 95, no. 1, pp. 121-125, 1986. AbstractWebsite
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El-Kabbany, F., Y. Badr, G. Said, and S. Taha, "Ferroelectricity associated with the metastable phase "III" of AgNO3", Applied Physics A Solids and Surfaces, vol. 43, no. 1, pp. 65-70, 1987. AbstractWebsite
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El‐Kabbany, F., Y. Badr, G. Said, and S. Taha, "Ferroelectricity Associated with the Metastable Phase III of AgNO3", physica status solidi (a), vol. 98, no. 1, pp. 117-125, 1986. 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.

Sagdinc, S. G., D. Erdas, I. Gunduz, and A. E. Sahinturk, "FT-IR and FT-Raman spectra, molecular structure and first-order molecular hyperpolarizabilities of a potential antihistaminic drug, cyproheptadine \{HCl\}", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 134, pp. 350 - 360, 2015. AbstractWebsite

Abstract Cyproheptadine hydrochloride (CYP HCl) {4-(5H-dibenzo[a,d]-cyclohepten-5-ylidene)-1-methylpiperidine hydrochloride} is a first-generation antihistamine with additional anticholinergic, antiserotonergic, and local-anesthetic properties. The geometry optimization, Mulliken atomic charges and wavenumber and intensity of the vibrational bands of all of the possible modes of \{CYP\} \{HCl\} have been calculated using ab initio Hartree–Fock (HF) and density functional theory (DFT) employing the \{B3LYP\} functional with the 6-311G(d,p) basis set. We have compared the calculated İR\} and Raman wavenumbers with experimental data. Quantum-chemical calculations of the geometrical structure, energies, and molecular electrostatic potential and \{NBO\} analysis of \{CYP\} \{HCl\} have been performed using the B3LYP/6-311G(d,p) method. The electric dipole moment (μ), static polarizability (α) and the first hyperpolarizability (β) values of the title compound have been computed using \{HF\} and \{DFT\} methods. The study reveals that the antihistaminic pharmacological property of \{CYP\} \{HCl\} has a large β value and, hence, may in general have potential applications in the development of non-linear optical materials. The experimental and calculated results for \{CYP\} \{HCl\} have also been compared with those for mianserin HCl.

Ali, Z., Y. Badr, and W. Eisa, "Gel, thermal, and X-ray diffraction characterization of virgin, scrapped polyethylene and its blends", Polymer Composites, vol. 27, no. 6, pp. 709-717, 2006. AbstractWebsite
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Al-Shamiri, H. A. S., I. M. Azzouz, M. Salah Shafik, and Y. A. Badr, "Glycidyl methacrylate as a new host material for laser dyes", Journal of Applied Polymer Science, vol. 103, no. 1, pp. 59-63, 2007. AbstractWebsite
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Khafagy, R. M., and Y. A. Badr, "In situ FTIR spectroscopic study of the recently detected low-temperature-induced structural changes in isotactic polypropylene", Journal of Polymer Science, Part B: Polymer Physics, vol. 43, no. 20, pp. 2829-2842, 2005. AbstractWebsite
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Meng, Q., A. Ren, L. Zhang, J. Liu, Z. Li, Y. Yang, R. Li, and L. Ma, "Incidence of infertility and risk factors of impaired fecundity among newly married couples in a Chinese population", Reproductive BioMedicine Online, vol. 30, no. 1, pp. 92 - 100, 2015. AbstractWebsite

Abstract The aims of this study were to obtain the incidence of infertility, to examine the causes of infertility and to explore risk factors for impaired fecundity in a rural region of northern China using a prospective follow-up design. A total of 2151 newly married couples planning to become pregnant within the next 12 months were enrolled between 2009 and 2012 from two counties of Shanxi Province in northern China. Couples were followed up for at least 1 year or until a clinical pregnancy occurred. Information about clinical pregnancy was obtained. The 12-month and 24-month infertility rates were 13.6% (95% \{CI\} 11.9 to 15.3) and 8.5% (95% \{CI\} 6.7 to 10.3), respectively. About 63% of women became pregnant within 6 months of follow up, and 86% did so within 12 months of follow up. The main causes of female infertility were ovulation disorders, fallopian tube problems and polycystic ovary syndrome. The primary cause of male infertility was sperm quality problems. Couples who used coal as cooking fuel, women with a higher body mass index, women with long-term health problems, and men who had married at later ages were more likely to have delayed pregnancies.

Darwish, A. G. A., Y. Badr, M. El Shaarawy, N. M. H. Shash, and I. K. Battisha, "Influence of the Nd3+ions content on the FTIR and the visible up-conversion luminescence properties of nano-structure BaTiO3, prepared by sol-gel technique", Journal of Alloys and Compounds, vol. 489, no. 2, pp. 451-455, 2010. AbstractWebsite
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