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RISS 인기검색어
- 검색키워드
- 저자 : W. Ashraf (검색결과 4 건)
- 무료
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Spline difference scheme for two-parameter singularly perturbed Partial differential equations
W. K. Zahra,M. S. El-Azab,Ashraf M. El Mhlawy 한국전산응용수학회 2014 Journal of applied mathematics & informatics Vol.32 No.1
In this paper, we construct a numerical method to solve singularly perturbed one-dimensional parabolic convection–iffusion problems. We use Euler method with uniform step size for temporal discretization and exponential-spline scheme on spatial uniform mesh of Shishkin type for full discretization. We show that the resulting method is uniformly convergent with respect to diffusion parameter. An extensive amount of analysis has been carried out to prove the uniform convergence with respect to the singular perturbation parameter. The obtained numerical results show that the method is efficient, stable and reliable for solving convection–iffusion problem accurately even involving diffusion parameter.
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Ashraf A. Sabe,Ahmed A. Sadek,Nassrene Y. Elmadhun,Rahul S. Dalal,Michael P. Robich,Cesario Bianchi,Frank W. Sellke 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.1
Resveratrol has been shown to improve cardiac perfusion and ventricular function after chronic ischemic injury. Using proteomic analysis, we sought to objectively investigate potential mechanisms, by which resveratrol exerts its cardioprotective effects in the setting of metabolic syndrome and chronic myocardial ischemia. Yorkshire swine were divided into two groups based on diet: high cholesterol (n = 7) or a high-cholesterol diet with supplemental resveratrol (n = 6). Four weeks later, all animals underwent surgical placement of an ameroid constrictor to their left circumflex artery. Diets were continued for another 7 weeks, and then the ischemic myocardium was harvested for proteomics analysis. Proteomic analysis identified 669 common proteins between the two groups. Of these proteins, 76 were statistically different, of which 41 were characterized (P < .05). Pathway analysis demonstrated that in animals supplemented with resveratrol, there was a downregulation in several proteins involved with mitochondrial dysfunction, cell death, and unfavorable cardiac remodeling. Furthermore, there was an upregulation in proteins involved in free radical elimination. We conclude that resveratrol supplementation significantly alters several critical protein markers in the chronically ischemic myocardium. Further investigation of these proteins may help elucidate the mechanisms by which resveratrol exerts its cardioprotective effects.
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SPLINE DIFFERENCE SCHEME FOR TWO-PARAMETER SINGULARLY PERTURBED PARTIAL DIFFERENTIAL EQUATIONS
Zahra, W.K.,El-Azab, M.S.,Mhlawy, Ashraf M. El The Korean Society for Computational and Applied M 2014 Journal of applied mathematics & informatics Vol.32 No.1
In this paper, we construct a numerical method to solve singularly perturbed one-dimensional parabolic convection-diffusion problems. We use Euler method with uniform step size for temporal discretization and exponential-spline scheme on spatial uniform mesh of Shishkin type for full discretization. We show that the resulting method is uniformly convergent with respect to diffusion parameter. An extensive amount of analysis has been carried out to prove the uniform convergence with respect to the singular perturbation parameter. The obtained numerical results show that the method is efficient, stable and reliable for solving convection-diffusion problem accurately even involving diffusion parameter.
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M. R. M. Asyraf,K. Z. Hazrati,Desmond Daniel Chin Vui Sheng,M. Rafdah,W. Ashraf,Emrah Madenci,Yasin Onuralp Özkılıç,Ceyhun Aksoylu,N. M. Nurazzi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.8
Lignocellulosic fibre obtained from forest biomass has various advantages, especially in product development due to its abundance and ability in mechanical properties. Sugar palm fibre (SPF) has emerged as promising fibre reinforcement in composite industries to form high-strength and stiffness biocomposites. Due to environmental concerns such as air pollution and global warming, the global community has worked together to replace conventional plastic with biomass waste like SPF in various product types. Traditionally, sugar palm by-products are useful for various traditional uses such as traditional foods, gula kabung, and alcohol, while SPF is applied as rope, brooms and brushes. Numerous researchers have taken initiatives to implement SPF in the packaging sector and transport uses such as lifeguard boats. Some works have proved that SPF-reinforced polymer composites exhibit high mechanical strength and remarkable properties in thermal degradations. However, like other lignocellulosic fibres, the SPF exhibits high water absorption properties, which causes problems binding with thermoplastic matrix, reducing its performance. Based on the literature survey, no review has been carried out on discussing the mechanical and thermal behaviour of SPF-reinforced thermoplastic composites. Hence, the current review aims to establish concise and collective findings from previous works on SPF/thermoplastic composites to provide a good source of literature for further research on this topic.
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