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Search Results: 1 - 10 of 59661 matches for " Ahmed Y. Ghaly "
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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.
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.
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.
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.
Numerical Solution of MHD Flow of Micropolar Fluid with Heat and Mass Transfer towards a Stagnation Point on a Vertical Plate  [PDF]
N. T. El-Dabe, A. Y. Ghaly, R. R. Rizkallah, K. M. Ewis, A. S. Al-Bareda
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.52013
Abstract: The paper investigates the numerical solution of problem of magnetohydrodynamic (MHD) micropolar fluid flow with heat and mass transfer towards a stagnation point on a vertical plate. In this study, we consider both strong concentrations (n = 0) and weak concentrations (n = 1/2). The governing equations have been transformed into nonlinear ordinary differential equations by applying the similarity transformation and have been solved numerically by using the finite difference method (FDM) and analytically by using (DTM). The effects of various governing parameters, namely, material parameter, radiation parameter, magnetic parameter, Prandtl number, Schmidt number, chemical reaction parameter and Soret number on the velocity, microrotation, temperature and concentration have been computed and discussed in detail through some figures and tables. 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) and the multi-step differential transform method (MDTM). It is observed that this approximate numerical solution is in good agreement with the analytical solution.
CT-Guided Lumbar Facet Joint Infiltration: Accessibility, Accuracy and Functional Outcome  [PDF]
Ahmed Elsayed, Walaa Y. Elsabeeny
Open Journal of Modern Neurosurgery (OJMN) , 2019, DOI: 10.4236/ojmn.2019.92012
Abstract: Background: Pain generated from lumbar facet joint affection is considered a common cause of low back pain. Image-guided facet joint infiltration is performed to reduce pain severity and to confirm its source. Aim: The objective of this study is to assess the accessibility, and accuracy and to evaluate the functional outcome of the CT-guided lumbar facet joint infiltration in management of low back pain. Subjects and Methods: This retrospective study included thirty four patients. All patients were diagnosed with low back pain due to lumbar facet syndrome. Adequate conservative therapy failed to improve the patient’s symptoms. Totally, 81 lumbar facet joints were treated by CT-guided intra-articular infiltration. Mean time of hospital stay was 6 - 8 hours. In the procedure technique, measures were applied to reduce the patients’ radiation exposure. The response to treatment was evaluated by the visual analogue scale (VAS) before procedure and at follow-up visits. Results: Among 34 adult patients included in this study, 26 were males and 8 were females. The mean age was 49.5 ± 8.5 years. Mean Duration of low back pain on admission was 8.2 ± 3.5 months. Bilateral CT-guided intra-articular infiltration was performed in 23 patients (67.5%). Assessing the response after facet joint infiltration, 82.4% of the patients showed immediate pain improvement after the procedure; 85.3% of the patients reported pain relief after 1 month and 67.6% at 12 month follow up. There was a statistically significant relief of pain after the intervention at 12 month follow up (p < 0.001). Conclusion: Lumbar Facet joint infiltration guided with CT scanning seems to be a reliable and safe procedure for low back pain management. Beside immediate and long term pain relief achieved using this minimally invasive technique; CT guidance provides an accessible and accurate route for the needle with low radiation dose exposure.
Reflections on Cybermind, V1.0
Salwa Ghaly
Transforming Cultures , 2008,
Abstract: This short piece attempts to reconstitute and reflect upon my impressions of the world of Cybermind, the cyberlist I joined in the spring of 2001. At the time, I resided in the United Arab Emirates, an important fact to underline at the outset, as my initial reactions and views on cyberspace were undoubtedly coloured by my geographic and cultural situatedness as much as by how my gender and ethnic identity played out online. Although I present, in what follows, a personal account, I would like to posit that my conclusions regarding gender dynamics on Cybermind reflect not only my own experience of/on online lists, but possibly that of other women listers as well. On Cybermind, women listers are caught between, on the one hand, the list as a would-be rhizomatic space holding out the liberatory promise of multiple playing fields for all, women included, and, on the other, the regulatory apparatuses working to align disembodied with embodied space, such that the former comes to refract, if not reflect, the latter. In what follows, I seek to share with the readers some thoughts, often disjointed, on how, despite all our efforts and wishes to make of the internet an empowering space for women, women’s voices in cyberspace can be censored, curtailed and excluded through online verbal and nonverbal processes and actions that seek to inscribe hierarchy and order by assigning and maintaining traditional gender roles.
Degradation of Phenolic Compounds in Creosote Treated Wood Waste by A Mixed Microbial Culture Augmented with Cellulolytic- Thermophilic Actinomaycets Thermobifida fusca  [PDF]
Abdel E Ghaly, Bopeng Zhang, Deepika Dave
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.31011
Abstract: Creosote is used for preservation of railway ties and timbers, electric utility poles, marine and foundation piling, fences and garden furniture. Creosote-treated wood waste may cause potential contamination of soil and water if they are not disposed properly. Creosote contains over 300 organic compounds including polycyclic aromatic hydrocarbons, phenolic compounds and heterocyclic organic compounds, many of which are toxic to human and can cause damage to kidney, liver, eyes and skin. The feasibility of using a composting technique inoculated with the cellulose degrading actinomycetesThermobifidafusca as a mesophilic/thermophilic bioremediation option to degrade phenolic compounds in creosote treated wood waste was evaluated. The temperature profile of bioremediation process clearly identified mesophilic and thermophilic phases in both experiments. Different degradation rates were observed in the mesophilic and thermophilic phases. Fluctuations of pH was observed in both experiment as the result of the breakdown of organic nitrogen to ammonium in the first week and the formation of organic acids and the loss of ammonium with the exhaust gases in the latter stage. The moisture content decreased in both trials because of the net loss of water with the exhaust gas. Both experiments achieved similar reductions in total carbon and TKN, volatile solids and phenolic compounds, cellulose and lignin indicating similar levels of microbial activities during the composting process. The stability and maturity of the final products were also similar. The inoculation of the cellulolytic-thermophilicactinomycetesThermobifidafusca did not manifest observable differences in degrading cellulose, lignin and phenolic compounds compared with the control.
Sequential Remediation Processes for a Low Level Pesticide Wastewater  [PDF]
Mariam T. Al hattab, Abdel E. Ghaly
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.32019
Abstract: The aim of this study was to develop a remediation system for the treatment of a low-level pesticide wastewater that uses available onfarm organic matter as an absorption media, is capable of reducing the concentration of the pesticide to a safe level and is economically viable for implementation by farmers. The absorption capacity of chopped hay and soybean to the fungicide captan was evaluated under batch conditions and the effectiveness of the composting process in depredating captan in contaminated organic materials was evaluated. The results showed that both hay and soybean plant residues were very effective in absorbing 99.2% and 98.5% of captan form the wastewater after 4 hours, respectively. Because of its availability, hay can be used in an onfarm pesticide immobilization system that consists of shallow reinforced concrete pit (filled with hay) with steel bars across the top for machinery to roll onto and be washed. The wastewater can be retained for 24 hours which is a sufficient time for hay to absorb the captan. The contaminated hay can then be composted. The addition of used cooking oil raised the temperature of the composting mixture to 63?C. Small reductions in moisture content (from 60% to 58.9 %) and C:N ratio (from 30:1 to 28:1) were observed while reductions of 18.92%, 15.56% and 4.8% in the volatile solids, total carbon total Kjeldahl nitrogen were achieved after 10 d of composting, respectively. About 92.4% of the captan was degraded in the first 4 days of composting. Most of captan (92.4%) was degraded during the mesophilic stage (first 3 days). The degradation rate constant for the mesophilic stage (0.724 d-1) was 2.74 times the degradation rate constant for the thermophilic stage (0.264 d-1). An onfarm windrow composting process would be very effective in degrading captan contaminated hay. The captan contaminated hay could be mixed with equal amount poultry manure or dairy manure to provide the required bioavailable carbon and nutrients for the composting process. Some used cooking oil could also be added to maintain higher temperature within the compost matrix. The windrows should be mixed on a daily basis to provide sufficient oxygen for the composting microorganisms.
Disposal and Treatment Methods for Pesticide Containing Wastewaters: Critical Review and Comparative Analysis  [PDF]
Mariam T. Al Hattab, Abdel E. Ghaly
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.35054
Abstract: Pesticides provide the primary means for controlling organisms that compete with man for food and fibre or cause injury to man, livestock and crops. They played a vital role in the economic production of wide ranges of vegetable, fruit, cereal, forage, fibre and oil crops which now constitute a large part of successful agricultural industry in many countries. After application to the target areas, pesticide residues are removed from applicators by rinsing with water which results in the formation of a toxic wastewater that represents a disposal problem for many farmers. Pesticides can adversely affect people, pets, livestock and wildlife in addition to the pests they are intended to destroy. The phenomenon of biomagnification of some pesticides has resulted in reproductive failure of some fish species and egg shell thinning of birds such as peregrine falcons, sparrow hawk and eagle owls. Pesticide toxicity to humans include skin and eye irritation and skin cancer. Therefore, care must be exercised in the application, disposal and treatment of pesticides. Currently, disposal of pesticide wastewater is carried out by: 1) land cultivation, 2) dumping in soil pits, plastic pits and concrete pits or on land and in extreme cases in streams near the rinsing operation, 3) use of evaporation beds and 4) land filling. These methods of disposal are unsafe as the surface run off will reach streams, rivers and lakes and the infiltration of the wastewater into the local soil will eventually reach ground water. The treatment methods currently used for pesticide wastewater include: 1) incineration (incinerators and open burning), 2) chemical treatments (O3/UV, hydrolysis, Fenton oxidation and KPEG), 3) physical treatments (inorganic, organic absorbents and activated carbon) and 4) biological treatments (composting, bioaugmentation and phytoremediation). Therefore, the choice of safe, on farm disposal techniques for agricultural pesticides is very important. A comparative analysis was performed on 18 methods of pesticide disposal/treatment using six criteria: containment, detoxification ability, cost, time, suitability for on farm use, size and evaporation efficiency. The results indicated that of the 18 methods evaluated, 9 scored above 80/100 and can be used on farm. They were organic absorbents (97), composting (94), bioaugmentation (92), inorganic absorbents (90), Fenton oxidation (86), O3/UV (83), activated carbon (82), hydrolysis (82), and land cultivation (80). The other methods are not suitable for on farm use as they suffered from containment problems, high
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