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Elsayed H.A.,Delta University for Science and Technology
Proceedings of 2014 9th IEEE International Conference on Computer Engineering and Systems, ICCES 2014 | Year: 2014

This paper presents a lossless audio coding using Burrows-Wheeler Transform (BWT) and a combination of a Move-To-Front coding (MTF) and Run Length Encoding (RLE). Audio signals used are assumed to be of floating point values. The BWT is applied to this floating point values to get the transformed coefficients; and then these resulting coefficients are converted using the Move-to-Front coding to coefficients can be better compressed and then these resulting coefficients are compressed using a combination of the Run Length Encoding, and entropy coding. Two entropy coding are used which are Arithmetic and Huffman coding. Simulation results show that the proposed lossless audio coding method outperforms other lossless audio coding methods; using only Burrows-Wheeler Transform method, using combined Burrows-Wheeler Transform and Move-to-Front coding method, and using combined Burrows-Wheeler Transform and Run Length Encoding method. © 2014 IEEE. Source

Elsayed H.A.,Delta University for Science and Technology
2015 1st URSI Atlantic Radio Science Conference, URSI AT-RASC 2015 | Year: 2015

In this paper two new highly efficient hybrid lossless audio coding techniques based on the Burrows-Wheeler Transform (BWT) and the distance transform (DT) are presented. In both techniques, floating point samples of the audio signal are first applied to the BWT and the resulting coefficients are then applied to the DT to obtain more suitable coefficients for the next step of lossless compression. In the first proposed method, two entropy-based lossless compression methods are considered, namely Arithmetic coding and Huffman coding. On the other hand, in the second proposed method the entropy coding is first preceded by Run Length Encoding (RLE). © 2015 International Union of Radio Science (URSI). Source

Rezk M.R.,Cairo University | Badr K.A.,Delta University for Science and Technology | Badr K.A.,Advanced Research Center
Journal of Pharmaceutical and Biomedical Analysis | Year: 2014

A rapid, simple, sensitive and specific LC-MS/MS method has been developed and validated for the simultaneous estimation of amlodipine (AML), benazepril (BEN) and benazeprilat (BNT) using eplerenone and torsemide as internal standards (IS). The Xevo TQD LC-MS/MS was operated under the multiple-reaction monitoring mode using electrospray ionization. Sample preparation involves both extraction and precipitation techniques. The reconstituted samples were chromatographed on Acquity UPLC BEH C18 (50mm×2.1mm, 1.7μm) column by pumping 0.1% formic acid and acetonitrile in a gradient mode at a flow rate of 0.45ml/min. A detailed validation of the method was performed as per the FDA guidelines and the standard curves were found to be linear in the range of 0.1-5ng/ml for AML; 5-1200ng/ml for both BEN and BNT. The intra-day and inter-day precision and accuracy results were within the acceptable limits. A run time of 2.5min for each sample made it possible to analyze more than 300 human plasma samples per day. The developed assay method was successfully applied to a bioequivalence study in human volunteers. © 2014 Elsevier B.V. Source

Abdallah Y.M.,Delta University for Science and Technology | Shalabi K.,Mansoura University
Protection of Metals and Physical Chemistry of Surfaces | Year: 2015

The inhibitive effect of the Euphorbia Helioscopia linn. extract (EHE) on the corrosion of copper in 1 M HNO3 has been evaluated by means of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The calculated adsorption thermodynamic parameters indicated that the adsorption was a spontaneous, exothermic process accompanied by an increase in entropy. The inhibition efficiency increases with increasing the concentration of the inhibitor in the medium and decrease with increasing the temperature. The maximum inhibition approached to 91% in the presence of 500 ppm EHE using Tafel polarization technique. The results show that EHE is an effective corrosion inhibitor for protecting the corrosion of copper in 1 M HNO3 medium even at stimulated conditions. © 2015, Pleiades Publishing, Ltd. Source

Al-Gayyar M.M.,Mansoura University | Elsherbiny N.M.,Delta University for Science and Technology
European Cytokine Network | Year: 2013

During the late 1970s, tumor necrosis factor alpha (TNF- α) was initially recognized as an endotoxininduced substance that was mainly produced by macrophages, and able to cause the lysis of certain tumor cells. Subsequent research demonstrated that TNF- α mediates a broad range of cellular activities, including proliferation, survival, differentiation and apoptosis. It is also considered to be essential for the induction and maintenance of the inflammatory immune responses. Meanwhile, visual impairment imposes a substantial disease burden on society. It is associated with both significant economic impact and reduction in quality of life. Visual impairment raises serious social challenges for both patients and their families, interfering with day-to-day life, and can limit employment possibilities.Manyof the most common, irreversible blinding pathologies involve neuronal loss fromthe retina, which is the light-sensing tissue of the eye. The retina, being part of the central nervous system, is unable to regenerate neurons lost to disease. Therefore, in the current review we will discuss the association between increased expression of TNF- α with neurodegenerative disorders, downstream cellular signaling mechanisms following interaction of TNF- α with its receptors, and the role of TNF- α as a possible target in the treatment of retinal neurodegenerative disorders. Source

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