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Search Results: 1 - 10 of 9510 matches for " Ahmed Younis Ghaly "
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Peristaltic Pumping of a Conducting Sisko Fluid through Porous Medium with Heat and Mass Transfer  [PDF]
Nabit Tawfiq Mohamed El-Dabe, Ahmed Younis Ghaly, Sallam Nagy Sallam, Khaled Elagamy, Yasmeen Mohamed Younis
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.53028
Abstract: The mathematical model is presented for the flow of peristaltic pumping of a conducting non-Newtonian fluid obeying Sisko model through a porous medium under the effect of magnetic field with heat and mass transfer. The solutions of the system of equations which represent this motion are obtained analytically using perturbation technique after considering the approximation of long wave length. The formula of the velocity with temperature and concentration of the fluid is obtained as a function of the physical parameters of the problem. The effects of these parameters on these solutions are discussed numerically and illustrated graphically through some graphs.
Hall Effect on Peristaltic Flow of Third Order Fluid in a Porous Medium with Heat and Mass Transfer  [PDF]
Nabil T. M. Eldabe, Ahmed Y. Ghaly, Sallam N. Sallam, Khaled Elagamy, Yasmeen M. Younis
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.39141
Abstract: We investigated the influence of hall, heat and mass transfer on the peristaltic flow of MHD third order fluid under long-wavelength and low Reynolds number approximation. The governing equations are solved analytically with the appropriate boundary conditions by using perturbation technique. The formula of velocity with temperature and concentration is obtained analytically as a function of the physical parameters of the problem.
Radiation effect on MHD free-convection flow of a gas at a stretching surface with a uniform free stream
Ahmed Y. Ghaly,Elsayed M. E. Elbarbary
Journal of Applied Mathematics , 2002, DOI: 10.1155/s1110757x02000086
Abstract: We investigate the problem of free convection heat transfer near an isothermal stretching sheet. This has been done under the simultaneous action of buoyancy, radiation, and transverse magnetic field. The governing equations are solved by the shooting method. The velocity and temperature functions are represented graphically for various values of the flow parameters: radiation parameter F, free convection parameter Gr, magnetic parameter M, Prandtl number Pr, and the parameter of relative difference between the temperature of the sheet, and the temperature far away from the sheet r. The effects of the radiation and magnetic field parameters on the shear stress and heat flux are discussed.
Numerical Solution of MHD Boundary Layer Flow of Non-Newtonian Casson Fluid on a Moving Wedge with Heat and Mass Transfer and Induced Magnetic Field  [PDF]
Nabil T. El-Dabe, Ahmed Y. Ghaly, Raafat R. Rizkallah, Karem M. Ewis, Ameen S. Al-Bareda
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.36078
Abstract: The paper investigates the numerical solution of the magnetohydrodynamics (MHD) boundary layer flow of non-Newtonian Casson fluid on a moving wedge with heat and mass transfer. The effects of thermal diffusion and diffusion thermo with induced magnetic field are taken in consideration. The governing partial differential equations are transformed into nonlinear ordinary differential equations by applying the similarity transformation and solved numerically by using finite difference method (FDM). The effects of various governing parameters, on the velocity, temperature and concentration are displayed through graphs and discussed numerically. In order to verify the accuracy of the present results, we have compared these results with the analytical solutions by using the differential transform method (DTM). It is observed that this approximate numerical solution is in good agreement with the analytical solution. Furthermore, comparisons of the present results with previously published work show that the present results have high accuracy.
Knowledge and Awareness of Breast Cancer among Young Women in the United Arab Emirates  [PDF]
Moustafa Younis, Dania Al-Rubaye, Hadeel Haddad, Ahmed Hammad, Manar Hijazi
Advances in Breast Cancer Research (ABCR) , 2016, DOI: 10.4236/abcr.2016.54019
Abstract: Background: Breast cancer is the most common cancer among females in the United Arab Emirates (UAE). It carries poor prognosis when detected late. Patients usually present at late stages due to lack of awareness of various aspects of breast cancer. Aim: The objective of this study is to gain insight into the level of knowledge of breast cancer among young adult females in UAE. Methods: A cross-sectional study was conducted among females aged 25 to 45. A total of 492 females were selected using a convenience sampling method. Data were collected through an interview-based questionnaire. Frequency distributions and percentages were used to describe the knowledge tested within the questionnaire. Results: The mean age of the participants was 33.5 years. Almost 27% of our participants received a high school degree. The average total knowledge of our population was 51%. The majority (89%) knew that breast cancer is common and 45% knew that it affects ages above forty. The knowledge of signs and symptoms was 53%, and more than half (57%) knew that the most common presenting sign is a breast lump. The knowledge of risk factors was 43%. Almost 94% knew that cancer can be detected early, and 93% knew that early diagnosis improves outcome. The total knowledge of screening methods was 67%. Conclusion: The study revealed that respondents’ knowledge of breast cancer is less than expected. The increased burden of the disease should be accompanied by powerful means of spreading awareness by implementing campaigns that would improve knowledge deficits.
Lissajous Orbits at the Collinear Libration Points in the Restricted Three-Body Problem with Oblateness  [PDF]
Ahmed H. Ibrahim, Mohammed N. Ismail, Afaf S. Zaghrout, Saher H. Younis, Mayadah O. El Shikh
World Journal of Mechanics (WJM) , 2018, DOI: 10.4236/wjm.2018.86020
Abstract: In the present work, the collinear equilibrium points of the restricted three-body problem are studied under the effect of oblateness of the bigger primary using an analytical and numerical approach. The periodic orbits around these points are investigated for the Earth-Moon system. The Lissajous orbits and the phase spaces are obtained under the effect of oblateness.
Relationship of Serum Leptin, BMI, Waist Circumference and Cholesterol Level among Teenagers in the Gaza Strip  [PDF]
Mahmoud H. Taleb, Samaher J. Younis, Baker Zabout, Ahmed A. Najim, Adham I. Ahmed, Eyad S. El-Bayary
Pharmacology & Pharmacy (PP) , 2014, DOI: 10.4236/pp.2014.58089

Leptin is one of the best known hormone markers for obesity. There is a limited anthropometric data in the Gaza Strip that reveals and arouses the nutritional status among all age groups especially adolescents aged 15 - 19 years old. The study aimed to assess the effect of Leptin hormone, lipid profiles, Body Mass Index (BMI) and waist circumference among secondary school age students in the Gaza Strip. Methodology: A cross sectional study included 442 cases of teenagers aged 15 - 19 years old from governmental and private schools in the Gaza strip. Blood samples were collected for analysis of Leptin hormone and lipid profile and measuring waist circumference for the teenager. Results: The mean of serum Leptin was (28.7) higher among cases than controls (28.1), but it was statistically insignificant (P = 0.85). It was found that there is a significant correlation between Leptin hormone and total cholesterol (Chol) (r = 0.24), high density cholesterol (HDL) (r = 0.27) and low density cholesterol (LDL) (r = 0.16). There was no relationship between Leptin hormone and triglycerides (TG) (r = -0.02). There was relationship between Leptin hormone and waist circumference in both males and females (r = 0.519, 0.544), respectively. There was no statistical significant deference noticed between Leptin hormone of obese objects and Leptin hormone of normal BMI objects of the same age (t-test = 0.93, P = 0.85). Conclusion: There are significant correlations between Leptin hormone and total Chol, HDL and LDL except for TG, and there were significant relationships between Leptin hormone and waist circumference which reflect the central obesity among males and females. There is no association between Leptin level and BMI.

Experimental Strain Investigation of Bolt Torque Effect in Mechanically Fastened Joints  [PDF]
Nashwan Younis
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.47047
Abstract: In this study, a different issue of mechanical engineering interests is determined for threaded fastened joints. A series of photoelastic experiments were performed to determine the maximum strains for the holes in a tensile flat plate subjected to bolt-nut loads. Pertinent strain distributions were examined to determine the roll of the torques on the bolts in mini mizing the strain; hence stress concentration. The experimental determination of maximum strains is needed as a way to validate future theoretical and numerical results, and provide a valuable aid to their application. The emphasis of this paper is on deformation. The results indicate that strains can decrease significantly with the increase of the bolt's pre-load.
A New Approach for the Exact Solutions of Nonlinear Equations of Fractional Order via Modified Simple Equation Method  [PDF]
Muhammad Younis
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513186

In this article, the modified simple equation method has been extended to celebrate the exact solutions of nonlinear partial time-space differential equations of fractional order. Firstly, the fractional complex transformation has been implemented to convert nonlinear partial fractional differential equations into nonlinear ordinary differential equations. Afterwards, modified simple equation method has been implemented, to find the exact solutions of these equations, in the sense of modified Riemann-Liouville derivative. For applications, the exact solutions of time-space fractional derivative Burgers’ equation and time-space fractional derivative foam drainage equation have been discussed. Moreover, it can also be concluded that the proposed method is easy, direct and concise as compared to other existing methods.

Prediction and analysis of nucleosome exclusion regions in the human genome
Ahmed Radwan, Akmal Younis, Peter Luykx, Sawsan Khuri
BMC Genomics , 2008, DOI: 10.1186/1471-2164-9-186
Abstract: A whole genome annotation for nucleosome exclusion regions (NXRegions) was carried out on the human genome. Nucleosome exclusion scores (NXScores) were calculated individually for each nucleotide, giving a measure of how likely a specific nucleotide and its immediate neighborhood would impair DNA bending and, consequently, exclude nucleosomes. The resulting annotations were correlated with 19055 gene expression profiles. We developed a new method based on Grubbs' outliers test for ranking genes based on their tissue specificity, and correlated this ranking with NXScores. The results show a strong correlation between tissue specificity of a gene and the propensity of its promoter to exclude nucleosomes (the promoter region was taken as -1500 to +500 bp from the RefSeq-annotated transcription start site). In addition, NXScores correlated well with gene density, gene expression levels, and DNaseI hypersensitive sites.We present, for the first time, a whole genome prediction of nucleosome exclusion regions for the human genome (the data are available for download from Additional Materials). Nucleosome exclusion patterns are correlated with various factors that regulate gene expression, which emphasizes the need to include chromatin structural parameters in experimental analysis of gene expression.Nucleosomes are DNA-protein complexes that form the building blocks of eukaryotic chromatin. They are involved in genome condensation, and play a major role in the regulation of gene expression [1]. Each nucleosome is made up of eight histone proteins that together form a structural unit able to accommodate 147 base pairs of DNA wound around it. The DNA sequence has to have the flexibility and curvature that allows it to circle around a nucleosome [2]. Empirical and theoretical studies have both shown that there are certain DNA sequence patterns that are too rigid to form such loops [3]. These patterns include GC-rich motifs as well as poly-A and poly-T tracts, and we have prev
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