Publications by authors named "Sameh I Ahmed"
NdSrMnO polycrystalline manganite was synthesized by two different methods: the auto-combustion reaction (NSMO-AC) and the sol-gel method (NSMO-SG). The structural, magnetic, magnetocaloric and critical behavior of the samples were examined. Rietveld refinements of the XRD patterns revealed that both compounds are pure single phase indexed to the orthorhombic system adopting the space group.
View Article and Find Full Text PDFIntact and non-intact urinary stones richening with calcium oxalate were collected and characterized. The elemental analysis, phase quantifications, and function groups were determined by different spectroscopic techniques, namely: energy-dispersive X-ray fluorescence (EDXRF), the synchrotron radiation X-ray diffraction (SR-XRD), and attenuated total reflection Fourier transform infrared (ATR-FTIR). The quantitative analysis of twenty elements was demonstrated in the most of the urinary stones and these elements are: Ca, Na, P, S, Mg, Cl, Zn, K, Ti, Sr, Ni, Co, Fe, Cu, Cd, Br, Pb, Se, I, and Mn.
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- The study examined how the microstructure and chemical makeup of various Ti-based alloys (Ti-6Al-4V, Ti-6Al-7Nb, TC21) affect the growth and breakdown of passive layers that prevent corrosion.
- Cyclic polarization and chronoamperometry were used to measure corrosion rates and the kinetics of passive layer growth, while dynamic electrochemical impedance spectroscopy (DEIS) assessed uniform corrosion rates in a saline solution at body temperature.
- Results indicated that TC21 exhibited the highest susceptibility to pitting corrosion, while Ti-6Al-7Nb showed the lowest resistance, and differences in microstructure were crucial to understanding the alloys' varying corrosion behaviors.