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- 저자 : Ahmed Mohamed Sharaf (검색결과 3 건)
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Ahmed Mohamed Sharaf,Eslam Syala,Abbas Anwar Ezzat,Salah F. Abdellah Ali,E. El-Rafey 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
Both the chicken eggshell (ES) and rice husk (RH) represent environmental, and pollution issues. Incorporatingboth of them, with minimum processing procedures, in various useful applications is a major contribution in solving suchproblems. In this research, unsaturated polyester (UP) was doped with different percentages (5-25 wt.%) of fine (ES) to formone (UP-ES) composite system. The (UP-ES) system was reinforced with a fixed 10 wt.% of (RH), which represents anagricultural waste produced in tonnage, to fabricate the second system. X-ray diffraction (XRD) analysis emerged that the(ES) is forming from calcium carbonate (CaCO3) resembling typically the mineral one. The addition of (ES) enhanced boththe mechanical characteristics of (UP) resin in terms of tensile strength, elongation %, tensile modulus, impact strength,flexural strength from 26.33 to 33.77 MPa, from 3.30 to 3.60 MPa, from 2000 to 2406.67 MPa, from 1.25 to 2.42 kJ/m², from64.93 to 75.07 MPa, and the thermal stability from 335.75 to 346.24 oC, respectively. This inclusion of (ES) also promotedboth the limiting oxygen index (LOI) and dielectric constant (εr) of (UP) from 17.25 to 23.50 % and from 6.76 to 11.02,respectively. The addition of (RH) to (ES-UP) composite, generally, gave the same attitude for the properties like what in the(ES-UP) system other than the remarkable extra-increase in the (εr). Also, (RH) elevated the water absorption (%) of (ES-UP)composite by the action of its hydrophilic nature. It is concluded that the incorporation of both (ES) and (RH) reduces thefinal cost of the composite and solves one of the great environmental disposal issues.
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Elham Ahmed Hassan,Abeer Sharaf El-Din Abde,Mohamed Omar Abdel-Malek,Asmaa Omar Ahmed,Nourhan Mahmoud Abbas 대한간학회 2019 Clinical and Molecular Hepatology(대한간학회지) Vol.25 No.3
Background/Aims: Cellulitis is a common infection in patients with liver cirrhosis. We aimed to compare risk factors, microbial aspects, and outcomes of cellulitis in compensated and decompensated hepatitis C virus (HCV)-related cirrhosis. Methods: Six hundred twenty consecutive HCV-related cirrhotic patients were evaluated for cellulitis. Demographic and clinical data were evaluated, along with blood and skin cultures. Severity of cirrhosis was assessed using Child-Pugh score. In-hospital mortality was assessed. Results: Seventy-seven (12.4%) cirrhotic patients had cellulitis (25 with compensated and 52 with decompensated disease). Smoking and venous insufficiency were risk factors of cellulitis in compensated cirrhosis. Leg edema, ascites, hyperbilrubinemia and hypoalbuminemia were risk factors in decompensated cirrhosis. Gram-positive bacteria (Staphylococcus spp. and Streptococcus pyogenes) were the infective organisms in compensated patients, while gram negative bacteria (Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa) were the predominant organisms in decompensated cirrhosis. Fungi (Candida albicans and Aspergillus niger) were detected in 3 decompensated cases. In-hospital mortality in patients with cellulitis was 27.3%, approaching 100% in decompensated patients with gram-negative cellulitis. Prolonged hospitalization, higher model for end-stage liver disease (MELD)-Na score, septic shock, local complication, and recurrent cellulitis were predictors of mortality. Conclusions: Cellulitis in compensated cirrhosis is different from that of decompensated patients regarding microorganisms, pathogenesis, and prognosis. Cellulitis has a poor prognosis, with mortality rates approaching 100% in decompensated patients with gram-negative cellulitis. Stratifying patients according to severity of cirrhosis is important to identify the proper empirical antibiotic and to decide the proper means of care.
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Inelastic large deflection analysis of space steel frames consisting of I-shaped cross section
Ashraf ElSabbagh,Ahmed Hanefa,Ahmed Zubydan,Mohamed ElGhandour,Tarek Sharaf 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.6
This paper presents a simplified model to capture the nonlinear behavior of steel frames depending on the spread of plasticity method. New interaction formulae were derived to evaluate the plastic strength for I-shaped steel sections under uniaxial bending moment and axial compression load. Also, new empirical formulae were derived to evaluate the tangent stiffness modulus of steel I-shaped cross-sections considering the effect of the residual stresses suggested by the specifications in European Convention for Construction Steelworks (ECCS). The secant stiffness which depends on the tangent modulus is used to evaluate the internal forces. Based on stiffness matrix method, a finite element analysis program was developed for the nonlinear analysis of space steel frames using the derived formulae. Comparison between the proposed model results with those given by the fiber model shows very good agreement. Numerical examples were introduced to verify, check the accuracy, and evaluate the efficiency of the proposed model. The analysis results show that the new proposed model is accurate and able to minimize the solution time.
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