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Search Results: 1 - 10 of 470335 matches for " Magdy A. El Hawary "
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Evaluation of Decompressive Craniectomy  [PDF]
Magdy A. El Hawary, Usama M. El Shokhaiby, Ahmed Maher Ahmed
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.83022
Abstract: Background and Purpose: Decompressive craniectomy is a surgery used to remove a large bone flap and opening the dura to allow edematous brain tissue to bulge extracranially. However, the efficacy of decompressive surgery to reduce the mortality and improve the outcome in patients with refractory intra-cranial pressure is still unclear. We investigated whether decompressive crani-ectomy is associated with improved conscious state and survival in patients with severely raised intracranial pressure and resistant to conservative management. Methods: We studied 20 patients with clinical and radiological evidence of increased intracranial pressure & indicated for decompressive crani-ectomy. All patients were followed postoperatively in ICU with serial follow up (CT). Consciousness level was evaluated using the Glasgow Coma Scale and Glasgow outcome score. Results: The overall mortality was 11 cases (55%), two cases remain in a vegetative state (10%), one case (5%) was severely disabled and six cases (30%) discharged with mild disability. Conclusion: In 20 cases with severely raised intracranial pressure resistant to conservative management Decompressive Craniectomy allowed (30 %) of cases to be discharged from hospitals with mild degree of disability for rehabilitation.
Treatment of Resistant Clubfoot with Soft Tissue Release and Alkhooly External Fixator  [PDF]
Ali Zein A. A. Al-Khooly, Mohamed Ali Ahmed Mohamed, Ebrahim El-Hawary Ali
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.37058
Abstract:

After the first research with this technique done by the first author, ten operations on the foot and ankle were performed on five patients (two boys and three girls) suffering from severe club foot deformity all with bilateral foot affection. Their ages ranged from five to fourteen years. All of them were treated by soft tissue release, skin flap (rotational flap), supplemented with Alkhooly external fixator. The follow up period ranged from two to seven years. The results according to Mittal (1987) [1] were excellent in eight feet (80%) and good in two feet (20%).

 

 

Mean Square Numerical Methods for Initial Value Random Differential Equations  [PDF]
Magdy A. El-Tawil, Mohammed A. Sohaly
Open Journal of Discrete Mathematics (OJDM) , 2011, DOI: 10.4236/ojdm.2011.12009
Abstract: In this paper, the random Euler and random Runge-Kutta of the second order methods are used in solving random differential initial value problems of first order. The conditions of the mean square convergence of the numerical solutions are studied. The statistical properties of the numerical solutions are computed through numerical case studies.
Endoscopic Assisted Microscopic Skull Base Surgery  [PDF]
Mohammed Attia, Islam Alaghoy, Magdy El Hawary, Maamon Abo-Shosha
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.82016
Abstract:

Background: Skull base tumors presented great challenge for neurosurgeons since decades due to their deep location, associated morbidity and limitation of operative field; however modern neurosurgery using the endoscope and/or the microscope served in minimizing peri-operative morbidities and improving the clinical outcome. Objective: To demonstrate the value of endoscope-assisted microsurgical technique for resection of skull base tumors. Patients and Methods: 30 patients divided into 3 groups (10 patients had medial sphenoid wing meningioma constituted group 1, 10 patients had suprasellar meningioma constituted group 2 and 10 patients had Cerbello-Pontine Angle (CPA) epidermoids constituted group 3) were operated through Endoscope Assisted Microscopic Skull Base Surgery technique at Al-Azhar University Hospitals during the period starting from January 2016 till the end of September 2017

Solution of Stochastic Cubic and Quintic Nonlinear Diffusion Equation Using WHEP, Pickard and HPM Methods  [PDF]
Magdy A. El-Tawil, Aisha F. Fareed
Open Journal of Discrete Mathematics (OJDM) , 2011, DOI: 10.4236/ojdm.2011.11002
Abstract: In this paper, the cubic and quintic diffusion equation under stochastic non homogeneity is solved using Wiener- Hermite expansion and perturbation (WHEP) technique, Homotopy perturbation method (HPM) and Pickard approximation technique. The analytic solution of the linear case is obtained using Eigenfunction expansion .The Picard approximation method is used to introduce the first and second order approximate solution for the non linear case. The WHEP technique is also used to obtain approximate solution under different orders and different corrections. The Homotopy perturbation method (HPM) is also used to obtain some approximation orders for mean and variance. Using mathematica-5, the methods of solution are illustrated through figures, comparisons among different methods and some parametric studies.
Aminolysis of 1-(1-Hydroxybenzotriazolyl)-2,4-dinitrobenzene and 2-(1-Hydroxybenzotriazolyl)-5-nitropyridine  [PDF]
Sherine N. Khattab, Mohamed A. H. Kharaba, Amal El-Hawary, Ayman El-Faham, Ezzat A. Hamed
Open Journal of Physical Chemistry (OJPC) , 2012, DOI: 10.4236/ojpc.2012.23021
Abstract: The reaction 1-(1-hydroxybenzotriazolyl)-2,4-dinitrobenzene 1 and 2-(1-hydroxybenzotriazolyl)-5-nitro-pyridine 2 with amines undergoes amination followed by elimination of the 1-hydroxyl benzotriazolyl anion. The kinetic data for the reaction of 1 and 2 with Mo, CHA and An in MeOH and AN proceeded by uncatalysed mechanism in which the rate limiting step is the leaving group departure, whereas the reaction with Mo in toluene proceeded by uncatalysed mechanism in which the formation of the zwitterionic intermediate is the rate determining step. While the reactions of 1 with CHA and An and the reaction of 2 with CHA in toluene proceeded by SB mechanism in which the rate determining step is the proton transfer process. The reactions of 1 and 2 with Mo in the three solvents and with CHA and An in MeOH and AN is greatly depended on the stability of the zwitterionic intermediate. The effect of ring activation is due to the ground state stabilization and the more efficient delocalization of the negative charge with a nitro group than with a ring-nitrogen in the transition state. The low activation enthalpies ΔH# and the highly negative activation entropies ΔS# are due to the intramolecular hydrogen bonding with the ammonio hydrogen present in the transition state.
Solution of Nonlinear Stochastic Langevin’s Equation Using WHEP, Pickard and HPM Methods  [PDF]
Maha Hamed, Magdy A. El-Twail, Beih El-desouky, Mohamed A. El-Beltagy
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.53041
Abstract:

This paper introduces analytical and numerical solutions of the nonlinear Langevin’s equation under square nonlinearity with stochastic non-homogeneity. The solution is obtained by using the Wiener-Hermite expansion with perturbation (WHEP) technique, and the results are compared with those of Picard iterations and the homotopy perturbation method (HPM). The WHEP technique is used to obtain up to fourth order approximation for different number of corrections. The mean and variance of the solution are obtained and compared among the different methods, and some parametric studies are done by using Matlab.

Effects of Mixing Canola and Palm Oils with Sunflower Oil on the Formation of Trans Fatty Acids during Frying  [PDF]
Radwan S. Farag, Magdy A. S. El-Agaimy, Bothaina S. Abd El Hakeem
Food and Nutrition Sciences (FNS) , 2010, DOI: 10.4236/fns.2010.11005
Abstract: GLC analysis was conducted to indicate the formation of trans- C18 fatty acids of sunflower, canola and palm oils during frying. Blends of sunflower oil and palm oil or canola oil were obtained by mixing sunflower oil with palm or canola oils at the volume ratios of 60: 40, 40: 60 and 20: 80 (v/v), then heated at 180?C ± 5?C for 5, 10, 15 and 20 h in the atmospheric oxygen. GLC results demonstrate that the formation of trans C18-fatty acids was generally dependent upon the frying time and oil mixing ratios. Furthermore, mixing sunflower oil with oils rich in monounsaturated fatty acids (palm or canola oils) lowered the formation of trans-C18 fatty acids during frying.
Spectrophotometric Determination of Diazepam in Pure form, Tablets and Ampoules
W. F. El-Hawary,Y. M. Issa,,A. Talat
International Journal of Biomedical Science , 2007,
Abstract: The interaction of diazepam with picric acid (I), 3, 5-dinitrobenzoic acid (II) and 2, 4-dinitrobenzoic acid (III) was found to be useful for its spectrophotometric determination. the quantitation was carried out at 475, 500, and 500 nm for the reaction with (I), (II) and (III), respectively. the effect of several variables on the coloring process was studied. the proposed methods have been applied successfully for the determina tion of diazepam in pure samples and in its pharmaceutical preparations with good accuracy and precision. the results were compared to those obtained by the pharmacopoeial methods. the linear ranges for obedi ence of beer’s law are up to 85.6, 180.2, and 128.6 μg/ml, ringbom ranges are 10.0-79.0, 15.2-177.8, 17.0-83.0 μg/ml, and rsD 0.048, 0.028, and 0.026% for reaction of diazepam with I, II, and III, respectively.
Performance Enhancement for Adaptive Beam-Forming Application Based Hybrid PSOGSA Algorithm  [PDF]
Ahmed Magdy, Osama M. EL-Ghandour, Hesham F. A. Hamed
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2015, DOI: 10.4236/jemaa.2015.74014
Abstract: Recently researchers were interested in hybrid algorithms for optimization problems for several communication systems. In this paper, a novel algorithm based on hybrid PSOGSA technique (combination of Gravitational Search Algorithm and Particle Swarm Optimization) is presented to enhance the performance analysis of beam-forming for smart antennas systems using N elements for Uniform Circular Array (UCA) geometry. Complex excitations (phases) of the array radiation pattern are optimized using hybrid PSOGSA technique for a set of simultaneously incident signals. Our results have shown tremendous improvement over the previous work was done using Uniform Linear Array (ULA) geometry and standard GSA in terms of normalized array factor and computational speed for normalized fitness values.
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