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Search Results: 1 - 10 of 152630 matches for " Mohamed B. Mohamed "
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Plane Strain Fracture Behaviour of Fabric Reinforced Hybrid Composites under varied Notch Configurations  [PDF]
K. Mohamed Kaleemulla, B. Siddeswarappa
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.86043
Abstract: Utilization of fabric reinforced hybrid polymer composites has increased tremendously in many engineering fields. The present investigation is an attempt on fabric-reinforced hybrid composite laminates with different volume fractions of the constituent materials; epoxy resin, plain-woven glass fabric, and textile satin fabric. Fracture toughness of a material has immense importance in the determination of the resistance of the material to crack propagation. Hence in this article, impact behaviour and fracture toughness of the laminates were investigated as per ASTM-D256 standards. Specimen configuration includes selection of different notch depths, fiber proportion and orientations. The fracture toughness has been found to increase continuously with increased volumes of glass fabric and significantly dependent on the notch size. Experimental results are validated using analysis of variance (ANOVA) technique, and found that percentage contribution of glass content is approximately 80%, while notch depth and orientation have contributed only 16%.
Deleterious Nonsynonymous SNP Found within HLA-DRB1 Gene Involved in Allograft Rejection in Sudanese Family: Using DNA Sequencing and Bioinformatics Methods  [PDF]
Mohamed M. Hassan, Sofia B. Mohamed, Mohamed A. Hussain, Amar A. Dowd
Open Journal of Immunology (OJI) , 2015, DOI: 10.4236/oji.2015.54018
Abstract: Renal transplantation provides the best long-term treatment for chronic renal failure. Single-nucleotide polymorphisms (SNPs) play a major role in the understanding of the genetic basis of many complex human diseases. Also, the genetics of human phenotype variation could be understood by knowing the functions of these SNPs. It is still a major challenge to identify the functional SNPs in a disease-related gene. This work explored how SNPs mutations in HLA-DRB1 gene could affect renal transplantation rejection. This study was carried out in Ahmed Gasim Hospital, Renal Dialysis Center during the period, from September 2012 to November 2013. Blood samples from five Sudanese patients (different families) with known renal transplantation rejection were collected before hemodialysis, furthermore one blood sample for control. DNA sequences results and detected SNPs were analyzed using bioinformatics tools (BLAST, SIFT, nsSNP Analyzer, PolyPhen, I-mutant, BioEdit, CPH, Chimera, Box shade and Project Hope). In addition, international databases were used for datasets [NCBI, Uniprot]. Results showed that, three SNPs were detected; two of three SNPs were predicted as tolerant or benign (rs1059575, novel) and one was deleterious (rs17885437). This study concluded that the identification of pathological SNPs could be an answer to unknown causes for a lot of organ transplantation rejection cases.
A Genetic Algorithm with Weighted Average Normally-Distributed Arithmetic Crossover and Twinkling  [PDF]
George S. Ladkany, Mohamed B. Trabia
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330178
Abstract: Genetic algorithms have been extensively used as a global optimization tool. These algorithms, however, suffer from their generally slow convergence rates. This paper proposes two approaches to address this limitation. First, a new crossover technique, the weighted average normally-distributed arithmetic crossover (NADX), is introduced to enhance the rate of convergence. Second, twinkling is incorporated within the crossover phase of the genetic algorithms. Twinkling is a controlled random deviation that allows only a subset of the design variables to undergo the decisions of an optimization algorithm while maintaining the remaining variable values. Two twinkling genetic algorithms are proposed. The proposed algorithmsare compared to simple genetic algorithms by using various mathematical and engineering design test problems. The results show that twinkling genetic algorithms have the ability to consistently reach known global minima, rather than nearby sub-optimal points, and are able to do this with competitive rates of convergence.
Finite Element Analysis of the Ramberg-Osgood Bar  [PDF]
Dongming Wei, Mohamed B. M. Elgindi
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.33030

In this work, we present a priori error estimates of finite element approximations of the solution for the equilibrium equation of an axially loaded Ramberg-Osgood bar. The existence and uniqueness of the solution to the associated nonlinear two point boundary value problem is established and used as a foundation for the finite element analysis.

Removal of Zn (II) from Aqueous Solution onto Kaolin by Batch Design  [PDF]
Bahia Meroufel, Omar Benali, Mohamed Benyahia, Mohamed Amine Zenasni, André Merlin, Béatrice George
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.57067

The Algerian kaolin clay was investigated to remove Zn(II) heavy metal ion from aqueous solution. The effect of contact time, initial metal ion concentration, pH and temperature was experimentally studied in batch mode to evaluate the adsorption capacity, kinetic, thermodynamic and equilibrium. The extent of zinc adsorption increased with increasing initial concentration of adsorbat, pH and temperature. The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms and both models fitted well. The monolayer adsorption capacity for Zn(II) ions was 12.23 mg per g of kaolin clay at pH 6.1 and 25°C. Dubinin-Radushkevich (D-R) isotherm model was also applied to the equilibrium data. Thermodynamic parameters showed that the adsorption of Zn(II) onto kaolin clay was spontaneous and endothermic process in nature. Furthermore, the Lagergren-first-order and pseudo-second-order models were used to describe the kinetic data. The experimental data fitted well the pseudo-second-order kinetic. As a result, the kaolin clay may be used for removal of zinc from aqueous media.

Overcoming seasonality in the tropics by growing tomato (Lycopersicon esculentum Mill.) varieties under cooled conditions  [PDF]
Saifeldin Mohamed El-Amin, Randa B. M. Ali
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34073
Abstract: The main objective of this work was to overcome seasonality in tomato production under hot tropical summer conditions, as well as to evaluate the adaptability and productivity of cherry and normal size indeterminate tomato varieties. The tested varieties were the standard varieties, Chanoa, Merel, Sensie and Yusra and the cherry varieties, Tomi and Elitrro. The cherry variety Elitrro recorded the highest plant height followed by the normal Merel. The cherry varieties over-numbered the classic varieties for mean number of fruits per cluster and mean number of fruits per meter square. There was no significant difference between the best yielders, the classic varieties Chanoa (25.63 kg/m2) and Yusra (24.13 kg/m2) and the cherry variety Elitrro (24.00 kg/m2). Yusra recorded the highest fruit diameter (60-70 mm). The classic type tomatoes are well known and of high demand in Sudan that give Chanoa and Yusra better adoption chances. Our results clearly indicated that production of summer tomato under cooled plastic house conditions is a new technique that has the potential to overcome the seasonality of tomato production under Sudan and similar tropical condition.
A Note on the Proof of the Perron-Frobenius Theorem  [PDF]
Yun Cheng, Timothy Carson, Mohamed B. M. Elgindi
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.311235
Abstract: This paper provides a simple proof for the Perron-Frobenius theorem concerned with positive matrices using a homotopy technique. By analyzing the behaviour of the eigenvalues of a family of positive matrices, we observe that the conclusions of Perron-Frobenius theorem will hold if it holds for the starting matrix of this family. Based on our observations, we develop a simple numerical technique for approximating the Perron’s eigenpair of a given positive matrix. We apply the techniques introduced in the paper to approximate the Perron’s interval eigenvalue of a given positive interval matrix.
On the Buckling of Euler Graphene Beams Subject to Axial Compressive Load  [PDF]
Mohamed B. M. Elgindi, Dongming Wei, Yeran Soukiassian, Yu Liu
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.22016
Abstract: In this paper, we consider the buckling of an Euler-Bernoulli graphene beam due to an axial compressive load. We formulate the problem as a non-linear (eigenvalue) two-point boundary value problem, prove some properties of the eigenpairs and introduce a suitable numerical shooting method scheme for approximating them. We present the perturbation and the numerical approximations of the first and second buckling loads and the corresponding shapes.

Adsorption of Congo Red from Aqueous Solution Using CTAB-Kaolin from Bechar Algeria  [PDF]
Mohamed Amine Zenasni, Bahia Meroufel, André Merlin, Béatrice George
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.46037
Abstract: Cetyltrimethylammonium bromide-modified kaolin (CTAB-kaolin or KC) was prepared and tested as an adsorbent for an anionic dye Congo red (CR) removal from aqueous solution in comparison with natural kaolin (K). The effect of various experimental parameters was investigated using a batch adsorption technique. In this manner, the adsorption isotherms and adsorption kinetics of CR on K and KC were examined. The isothermal data could be well described by the Langmuir equation and the dynamical data fit well with the pseudo-second-order kinetic model. The adsorption capacity of modified kaolin KC (24.46 mg/g) was found to be around 4 times higher than that of natural kaolin K (5.94 mg/g). The KC demonstrated the highest adsorption capacity by removing over 98% of CR after ten minutes of contact. These results indicate that CTAB-kaolin could be employed as low-cost alternative to activated carbon in wastewater treatment for the removal of colour which comes from industrial effluents of textile activities, tanning or printing.
Characterization of In-Plane Mechanical Properties of Laminated Hybrid Composites  [PDF]
K. G. Satish, B. Siddeswarappa, K. Mohamed Kaleemulla
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.92009
Abstract: An experimental investigation was conducted to study the effect of hybrid composite specimen subjected to in-plane tensile and compressive loading. The laminated specimens in accordance with ASTM standards were fabricated using steel and nylon bi-directional mesh as reinforcements and polyester as the binder. The various volume fractions and fiber orientations were used in which the percentage of polyester (40%) was maintained constant. From the investigations it is revealed that, the specimens with higher percentage of steel sustain greater loads & also the strengths are superior in case of 0/900 oriented specimens. A relationship between the tensile/compressive strength, fiber content and orientation has been established.
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