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Generalized thermoelasticity with temperature dependent modulus of elasticity under three theories
M. Ezzat,M. Zakaria,A. Abdel-Bary 한국전산응용수학회 2004 Journal of applied mathematics & informatics Vol.14 No.-
A new model of generalized thermoelasticity equations for isotropic media with temperature-dependent mechanical properties is established. The modulus of elasticity is taken as a linear function of reference temperature. The present model is described both generalizations, Lord- Shulman (L-S) theory with one relaxation time and Green-Lindsay (G-L) with two relaxation times, as well as the coupled theory, instantaneously. The method of the matrix exponential, which constitutes the basis of the state space approach of modern control theory, applied to two-dimensional equations. Laplace and Fourier integral transforms are used. The resulting formulation is applied to a problem of a thick plate subject to heating on parts of the upper and lower surfaces of the plate that varies exponentially with time. Numerical results are given and illustrated graphically for the problem considered. A comparison was made with the results obtained in case of temperature-independent modulus of elasticity in each theory.
GENERALIZED THERMOELASTICITY WITH TEMPERATURE DEPENDENT MODULUS OF ELASTICITY UNDER THREE THEORIES
Ezzat, M.,Zakaria, M.,Abdel-Bary, A. 한국전산응용수학회 2004 Journal of applied mathematics & informatics Vol.14 No.1
A new model of generalized thermoelasticity equations for isotropic media with temperature-dependent mechanical properties is established. The modulus of elasticity is taken as a linear function of reference temperature. The present model is described both generalizations, Lord Shulman (L-S) theory with one relaxation time and Green-Lindsay (G-L) with two relaxation times, as well as the coupled theory, instantaneously. The method of the matrix exponential, which constitutes the basis of the state space approach of modern control theory, applied to two-dimensional equations. Laplace and Fourier integral transforms are used. The resulting formulation is applied to a problem of a thick plate subject to heating on parts of the upper and lower surfaces of the plate that varies exponentially with time. Numerical results are given and illustrated graphically for the problem considered. A comparison was made with the results obtained in case of temperature-independent modulus of elasticity in each theory.
Elsayed M. Abdel Bary,Ammar N. Harmal,Mona E. Ibrahim,Moustafa A. Gouda 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Novel chitosan nanoparticles (SCN) were synthesized via reaction of chitosan with different concentration of 2-chloro-N-(3-methylisoxazol-5-yl) acetamide (5 %, 10 % and 15 %) at 70-80 oC for 7 h to give the grafted polymer, whichcondensed with cyclohexanone Mannich base 45 oC for 7 h to afford the corresponding (SCN). These were stirred withDeflazacort drug to achieve the Deflazacort loading (SCN), which, compressed with calcium starch glycolate (CaSgly) togive the corresponding tablets. The pH 2. 1 and concentration of SCN-10 %/CaSgly (1:4) was found to be importantparameters in controlling the release profiles.
El-Maadawy, Eman A,Talaat, Roba M,Sadek, Rawia F,El-Sherbini, Sherif M,Abdel-Bary, Naser,Abdel-Aziz, Amal A Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.9
We aimed to investigate any association between hepatitis C virus (HCV) infection and non-Hodgkin's lymphoma (NHL) in the view of cytokines that control inflammation/angiogenesis and their correlation with certain CD markers. NHL patients with or without HCV infection were studied. CD5, CD30, CD3, CD20 and CD45 were immunohistochemically evaluated. Plasma levels of vascular endothelial and platelet derived growth factors (VEGF, and PDGF), tumor necrosis factor (TNF-${\alpha}$), transforming growth factor (TGF-${\beta}$), interleukin-6 (IL-6), IL-8, IL-4, IL-12 and interferon gamma (IFN-${\gamma}$) were detected by enzyme-linked immunosorbent assay (ELISA). HCV+ve NHL patients showed a significant reduction in VEGF, PDGF, IFN-${\gamma}$, CD5 and CD45 and a significant increase in IL-12 and IL-8. In conclusion, there was a significant change in cytokine secretion and expression of CD markers in HCV+ve NHL patients. Based on our results, HCV infection in NHL patients requires more in-depth investigations to explore any role in lymphoma progression.