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Gadalla, Mohamed,El Kadi, Hany Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.3
Thermal stability of quasi-isotropic composite and polymeric structures is considered one of the most important criteria in predicting life span of building structures. The outdoor applications of these structures have raised some legitimate concerns about their durability including moisture resistance and thermal stability. Exposure of such quasi-isotropic composite/polymeric structures to various and severe climatic conditions such as heat flux and frigid climate would change the material behavior and thermal viability and may lead to the degradation of material properties and building durability. This paper presents an analytical model for the generalized problem. This model accommodates the non-linearity and the non-homogeneity of the internal heat generated within the structure and the changes, modification to the material constants, and the structural size. The paper also investigates the effect of the incorporation of the temperature and/or material constant sensitive internal heat generation with four encountered climatic conditions on thermal stability of infinite cylindrical quasi-isotropic composite/polymeric structures. This can eventually result in the failure of such structures. Detailed critical analyses for four case studies which consider the population of the internal heat generation, cylindrical size, material constants, and four different climatic conditions are carried out. For each case of the proposed boundary conditions, the critical thermal stability parameter is determined. The results of this paper indicate that the thermal stability parameter is critically dependent on the cylinder size, material constants/selection, the convective heat transfer coefficient, subjected heat flux and other constants accrued from the structure environment.
Gadalla, M.A.,Abdalla, J.A. Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.5
Buckling capacity of compression members may change due to inadvertent changes in the member section dimensions or material properties. This may be the result of repair, modification of section properties or degradation of the material properties. In some occasions, enhancement of buckling capacity of compression members may be achieved through splicing of plates or utilization of composite materials. It is very important for a designer to predict the buckling resistance of the compression member and the important parameters that affect its buckling strength once changes in section and/or material properties took place. This paper presents an analytical approach for determining the buckling capacity of a compression member whose geometric and/or material properties has been altered resulting in a multi-step non-uniform section. This analytical solution accommodates the changes and modifications to the material and/or section properties of the compression member due to the factors mentioned. The analytical solution provides adequate information and a methodology that is useful during the design stage as well as the repair stage of compression members. Three case studies are presented to show that the proposed analytical solution is an efficient method for predicting the buckling strength of compression members that their section and/or material properties have been altered due to splicing, coping, notching, ducting and corrosion.
Mohamed Gadalla,Hany El Kadi 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.3
Thermal stability of quasi-isotropic composite and polymeric structures is considered one of the most important criteria in predicting life span of building structures. The outdoor applications of these structures have raised some legitimate concerns about their durability including moisture resistance and thermal stability. Exposure of such quasi-isotropic composite/polymeric structures to various and severe climatic conditions such as heat flux and frigid climate would change the material behavior and thermal viability and may lead to the degradation of material properties and building durability. This paper presents an analytical model for the generalized problem. This model accommodates the non-linearity and the non-homogeneity of the internal heat generated within the structure and the changes, modification to the material constants, and the structural size. The paper also investigates the effect of the incorporation of the temperature and/or material constant sensitive internal heat generation with four encountered climatic conditions on thermal stability of infinite cylindrical quasi-isotropic composite/polymeric structures. This can eventually result in the failure of such structures. Detailed critical analyses for four case studies which consider the population of the internal heat generation, cylindrical size, material constants, and four different climatic conditions are carried out. For each case of the proposed boundary conditions, the critical thermal stability parameter is determined. The results of this paper indicate that the thermal stability parameter is critically dependent on the cylinder size, material constants/selection, the convective heat transfer coefficient, subjected heat flux and other constants accrued from the structure environment.
( M. R. Gadalla ),( A. H. El-deeb ),( M. M. Emara ),( H. A. Hussein ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.12
In the present study, whispovirus immediate early 1 promoter (ie-1) was used to initiate surface expression of the hemagglutinin (HA) protein of Egyptian H5N1 avian influenza virus (AIV) by using the baculovirus expression vector system. The HA gene and whispovirus ie-1 promoter sequence were synthesized as a fused expression cassette (ie1-HA) and successfully cloned into the pFastBac-1 transfer vector. The recombinant vector was transformed into DH10Bac competent cells, and the recombinant bacmid was generated via site-specific transposition. The recombinant bacmid was used for transfection of Spodoptera frugiperda (Sf-9) insect cells to construct the recombinant baculovirus and to induce expression of the HA protein of H5N1 AIV. The recombinant glycoprotein expressed in Sf-9 cells showed hemadsorption activity. Hemagglutination activity was also detected in both extra- and intracellular recombinant HAs. Both the HA and hemadsorption activities were inhibited by reference polyclonal anti-H5 sera. Significant expression of the recombinant protein was observed on the surface of infected insect cells by using immunofluorescence. SDS-PAGE analysis of the expressed protein revealed the presence of a visually distinguishable band of ~63 kDa in size, which was absent in the non-infected cell control. Western blot analysis confirmed that the distinct 63 kDa band corresponded to the recombinant HA glycoprotein of H5N1 AIV. This study reports the successful expression of the HA protein of H5N1 AIV. The expressed protein was displayed on the plasma membrane of infected insect cells under the control of whispovirus ie-1 promoter by using the baculovirus expression vector system.
Ahmed Rowaida Saleh,Gadalla Sohair M. Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
This study is the conclusion of a planned series on Gerromorpha from Egypt. A list of Gerromorpha is given with notes on their habitats and distribution. A total of 5 families, 9 genera and 20 species are recorded from Egypt, of which Gerris costae Herrich-Schaeffer (Gerridae) is described as new to Egypt.
Ahmed Rowaida Saleh,Gadalla Sohair M. Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.3
This study is the fifth part of a series on Gerromorpha from Egypt. It includes a taxonomic review of family Veliidae that was recorded from Egypt with references to their habitats and distribution. Two genera: Microvelia Westwood & Rhagovelia Mayr and 6 species: M. gracillima Reuter; M. popovi Brown; M. macani Brown; M. pygmaea (Dufour); M. waelbroecki Kirkaldy & R. nigricans (Burmeister) are confirmed from Egypt. Microvelia macani Brown was recorded from Africa and Egypt for the first time. Keys for the identification of the subfamilies, genera and all species are given. Illustrations, and scanning electron microphotographs are provided.
Rowaida Saleh Ahmed,Sohair M. Gadalla 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
This study is the conclusion of a planned series on Gerromorpha from Egypt. A list of Gerromorpha is given with notes on their habitats and distribution. A total of 5 families, 9 genera and 20 species are recorded from Egypt, of which Gerris costae Herrich-Schaeffer (Gerridae) is described as new to Egypt.
Rowaida Saleh Ahmed,Sohair M. Gadalla 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.3
This study is the fifth part of a series on Gerromorpha from Egypt. It includes a taxonomic review of family Veliidae that was recorded from Egypt with references to their habitats and distribution. Two genera: Microvelia Westwood & Rhagovelia Mayr and 6 species: M. gracillima Reuter; M. popovi Brown; M. macani Brown; M. pygmaea (Dufour); M. waelbroecki Kirkaldy & R. nigricans (Burmeister) are confirmed from Egypt. Microvelia macani Brown was recorded from Africa and Egypt for the first time. Keys for the identification of the subfamilies, genera and all species are given. Illustrations, and scanning electron microphotographs are provided.