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Search Results: 1 - 10 of 564563 matches for " Mahmoud A. E. Abdelrahman "
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The exp(-φ(ξ))-Expansion Method and Its Application for Solving Nonlinear Evolution Equations  [PDF]
Mahmoud A. E. Abdelrahman, Emad H. M. Zahran, Mostafa M. A. Khater
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2015, DOI: 10.4236/ijmnta.2015.41004
Abstract: The exp(-φ(ξ))-expansion method is used as the first time to investigate the wave solution of a nonlinear dynamical system in a new double-Chain model of DNA and a diffusive predator-prey system. The proposed method also can be used for many other nonlinear evolution equations.
RETRACTED: The Modified Simple Equation Method and Its Applications in Mathematical Physics and Biology  [PDF]
Mahmoud A. E. Abdelrahman, Magdi Hakeem Armanious, Emad H. M. Zahran, Mostafa M. A. Khater
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.51001
Abstract: Short Retraction Notice

The paper does not meet the standards of \"American Journal of Computational Mathematics\".

This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Prof. Hari M. Srivastava (EiC of AJCM)

The full retraction notice in PDF is preceding the original paper, which is marked \"RETRACTED\".

Wideband Negative Permittivity Metamaterial for Size Reduction of Stopband Filter in Antenna Applications
Mahmoud Abdelrahman Abdalla;Mohamed A. Foad;H. A. Elregeily;A. A. Mitkees
PIER C , 2012, DOI: 10.2528/PIERC11082509
Abstract: The design and simplified analysis of a compact and wide band (16%) negative permittivity complementary split ring resonator metamaterial is introduced. The proposed metamaterial component was applied to reduce the size of the feeding line filter of microstrip patch antenna for the sake of higher order harmonic suppression. The reduction has been done using only one element of the complementary split ring resonator, while maintaining the antenna's performance. Simplified theoretical study and design of the proposed circuits has been presented. Moreover, experimental results have been done for validation and conformation purpose. Results confirm that almost 95% of the antenna noise harmonics power has been removed.
Numerical Investigation of the Tri-Atomic Ions Formation during Laser Ionization Based on Resonance Saturation  [PDF]
M. A. Abdelati, M. A. Mahmoud, Y. E. E. Gamal
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.212131

We present a theoretical investigation of plasma generation in sodium vapor induced by laser radiation tuned to the first resonance line (3S-3P) at λ = 589 ns. A set of rate equations that describe the rate of change of the ground and excited states population as well as the temporal variation of the electron energy distribution function (EEDF), beside the formed atomic ion Na+, molecular ion  and tri-atomic ions are solved numerically. The calculations are carried out at different laser energy and different sodium atomic vapor densities under the experimental conditions of Tapalian and Smith (1993) to test the existence of the formed tri-atomic ions. The numerical calculations of the electron energy distribution function (EEDF) show that a deviation from the Maxwellian distribution due to the super elastic collisions effect. In

The Impact of Training Residents on the Outcome of Robotic-Assisted Sacrocolpopexy
Mohamed A. Bedaiwy,Mohamed Abdelrahman,Stephanie Deter,Tarek Farghaly,Mahmoud M. Shalaby,Heidi Frasure,Sangeeta Mahajan
Minimally Invasive Surgery , 2012, DOI: 10.1155/2012/289342
Abstract: Objective. To evaluate the surgical outcomes of robotic-assisted sacrocolpopexy (RASCP) before and after the incorporation of hands-on training for urology and gynecology residents. Study Design. Forty-one patients underwent RASCP between December 2008 and March 2010 with one surgeon. RASCP was performed in the context of surgical repair of complex pelvic organ prolapse and/or stress urinary incontinence. The first 20 cases (group I) were performed exclusively by the attending surgeon. In the last 21 cases (group II), the urology resident performed a 50% or more of the RASCP while the gynecology resident performed the supracervical hysterectomy. The primary outcome measure was vaginal vault support at 24 weeks postoperatively based on pelvic organ prolapse quantification (POP-Q). Results. Mean?±?SD operative time for the entire surgery including RASCP was ?min and median EBL was ?mL. Patient demographics and stage of disease did not differ between groups. Procedure time, PACU time, blood loss, and intraoperative complications were similar between groups. Follow-up POP-Q evaluations demonstrated significant correction of all points on vaginal examination for both groups ( ). Conclusions. Incorporation of resident training during RASCP allows teaching of robotic surgery techniques in an effective manner without prolonging operative time or affecting the overall surgical outcome. 1. Introduction Pelvic organ prolapse is a very common problem that causes an estimated one in ten women to undergo surgery, and an additional 30% of these women will undergo additional surgery for repeat prolapse [1]. As the population of the United States continues to age, the number of women seeking treatment for pelvic organ prolapse will only continue to grow. The goal of surgical repair of all vaginal vault prolapse is to restore the anatomy and maintain sexual function and durability [2]. While the gold standard for vaginal vault prolapse is an abdominal sacrocolpopexy, large advances have been made in technology to allow minimally invasive approaches to become a viable alternative for surgeons [3]. Additionally, patients are also requesting a minimally invasive approach for their surgery because of the shorter hospital stay, decreased postoperative pain, and better cosmesis [4]. Initially, laparoscopy was offered to patients as a mode of performing a minimally invasive sacrocolpopexy. While patients have a decreased morbidity compared to traditional open approaches, there are notable difficulties experienced by the surgeon [3, 5]. Decreased range of motion, two-dimensional
Experimental Verification of a Triple Band Thin Radar Absorber Metamaterial for Oblique Incidence Applications
Mahmoud Abdelrahman Abdalla
PIER Letters , 2013,
Abstract: This paper presents the theory, design, and experimental investigation of an ultra thin (6% ) and triple band metamaterial radar absorber. The theoretical design of the reported absorber is investigated. The absorber performance was validated using the electromagnetic simulations and confirmed by experimental measurements for different incidence angles. The results confirm that the proposed metamaterial absorber can demonstrate triple bands with better than -15 dB reflection coefficient for all incident angles.
An Analysis of “Jordan Opportunities” Objectives in the General Secondary Certificate Examination of English: A Case Study in Jordan between 2008 and 2010
Mahmoud Sulaiman Bani Abdelrahman
Asian Social Science , 2010, DOI: 10.5539/ass.v6n11p72
Abstract: The study aimed at investigating the GSCE through assessing to what extent English Language Teaching Objectives are available in the GSCE in Jordan between 2008 and 2010.This study attempts to answer the following questions: 1- To what extent are the English language Teaching objectives realized in the GSCE in Jordan between 2008 and 2010 for each academic year? 2- To what extent are the English language Teaching objectives realized in the GSCE in Jordan between 2008 and 2010 for all the three years collectively? The sample of the study consists of all examination papers of the GSCE in English in Jordan between the years 2008 and 2010. For the purpose of the study, the researcher developed a questionnaire that consists of 13 Thirston –type items that were classified under the following categories: 1- listening 2 2- speaking 3 3- reading 3 4 - writing 5 The questionnaire was prepared in English. The questionnaire was given to a jury of professors, supervisors and teachers of English. The jury’s responses on the questionnaire were analyzed as follows: 1- Percentage and frequency in each response category. 2- Basic descriptive statistical mean and standard deviation. 3- Phi and Cramer’s V for nominal variables (corresponding internal contingency coefficient in case of interval variables) Using the Statistical Package for Social Studies (SPSS) uses the above-mentioned procedure. The study presents the following 1- The objectives of listening and speaking are not available in the GSCE completely. 2- Two out of three of the reading objectives are available. 3- Four out of five of the writing objectives are available in the GSCE. On the basis of the findings, the researcher recommended the following: 1- Include speaking and listening exams in the GSCE because of the need to let teachers teach them in classes. 2- Vary the questions of reading and writing to cover all the objectives. 3- To test what we teach not to teach what we are going to test as the case in most schools.
Surface Photometry and Dynamical Properties of Lenticular Galaxies: NGC3245 as Case Study  [PDF]
Mohamed Adel Sharaf, K. Mahmoud, E. Aly, A. A. Alshaery
International Journal of Astronomy and Astrophysics (IJAA) , 2012, DOI: 10.4236/ijaa.2012.21007
Abstract: In this paper, surface photometry and dynamical properties of Lenticular galaxies will be developed and applied to NGC3245. In this respect, we established new relation between the intensity distribution I and the semi-major axis a Moreover, some basic statistics of both independent and the dependent variables of the relation are also given. In addition to the I(a) relation , the Sérsic r1/n model is applied for the intensity profile I(r) resulting in an estimation of the effective radius, re, and the surface brightness it encloses, μe. Both relations (I(a) and I(r)) are accurate as judged by the precision criteria which are: the probable errors for the coefficients , the estimated variance of the fit and the Q value (the square distance between the exact solution and the least square estimated solution) where all very satisfactory. Correlation coefficients between some parameters of the isophotes are also computed. Finally as examples of applications of surface photometry we determined the dynamical properties: mass, density, potential distributions, as well as distributions of escape and circular speeds in terms of Sérsic model.
Effect of Coenzyme-Q10 on Doxorubicin-Induced Nephrotoxicity in Rats
Azza A. K. El-Sheikh,Mohamed A. Morsy,Marwa M. Mahmoud,Rehab A. Rifaai,Aly M. Abdelrahman
Advances in Pharmacological Sciences , 2012, DOI: 10.1155/2012/981461
Abstract: Nephrotoxicity is one of the limiting factors for using doxorubicin (Dox) as an anticancer chemotherapeutic. Here, we investigated possible protective effect of coenzyme-Q10 (CoQ10) on Dox-induced nephrotoxicity and the mechanisms involved. Two doses (10 and 100?mg/kg) of CoQ10 were administered orally to rats for 8 days, in the presence or absence of nephrotoxicity induced by a single intraperitoneal injection of Dox (15?mg/kg) at day 4 of the experiment. Our results showed that the low dose of CoQ10 succeeded in reversing Dox-induced nephrotoxicity to control levels (e.g., levels of blood urea nitrogen and serum creatinine, concentrations of renal reduced glutathione (GSH) and malondialdehyde, catalase activity and caspase 3 expression, and renal histopathology). Alternatively, the high dose of CoQ10 showed no superior nephroprotection over the low dose, as there were no significant improvements in renal histopathology, catalase activity, or caspase 3 expression compared to the Dox-treated group. Interestingly, the high dose of CoQ10 alone significantly decreased renal GSH level as well as catalase activity and caused a mild induction of caspase 3 expression compared to control, probably due to a prooxidant effect at this dose of CoQ10. We conclude that CoQ10 protects from Dox-induced nephrotoxicity with a precaution to dosage adjustment. 1. Introduction Doxorubicin (Dox), also known as adriamycin, is a broad spectrum anticancer anthracycline antibiotic that has been successfully used in treatment of a variety of hematological malignancies and solid tumors. Unfortunately, the use of Dox has been limited by the occurrence of dose-dependent toxicities to vital organs, as the heart, the kidney, and the liver [1]. The exact mechanism of Dox-induced nephrotoxicity is not yet completely understood. Renal Dox-induced toxicity may be part of a multiorgan damage mediated mainly through free radical formation eventually leading to membrane lipid peroxidation [2]. Induction of apoptosis and modulation of nitric oxide (NO) [3] are other mechanisms that may be involved in toxic adverse effects associated with Dox therapy. In addition, Dox may induce nephrotoxicity through its direct renal damaging effect, as it accumulates preferentially in the kidney [4]. Dox toxic effects to other organs as the heart and the liver may modulate blood supply to the kidney and alter xenobiotic detoxification processes, respectively, thus indirectly contributing to Dox-induced nephropathy. A number of antioxidant compounds have been proposed as chemopreventive therapy for
Multi-Detector Row Computed Tomography Urography (MDCTU) in the Evaluation of Microscopic Hematuria in Adults  [PDF]
Mohamed A. Mahmoud, Mustafa Z. Mahmoud, Mohammed A. Ali Omer, Mohamed E. M. Garalnabi, Ahmed Abukonna, Maram A. Fagiri
Open Journal of Radiology (OJRad) , 2015, DOI: 10.4236/ojrad.2015.51004
Abstract: Multi-detector row computed tomography urography (MDCTU) becomes the imaging modality of choice for evaluation of the kidneys and urinary tract. The aim of this study was to discuss and illustrate the role of MDCTU, on a 32-row CT scanner in the evaluation a variety of entities that were frequently associated with microscopic hematuria in adults. This prospective cohort study was performed in the period of August 2013 to October 2014. Fifty positive participants to microscopic hematuria were examined at the radiology department of Alnilin Diagnostic Medical Center and Antalya Medical Center. Computed tomography urography (CTU) scanning was performed using two powerful performances, high speed multi-detector row on 32-row CT scanners (Siemens Healthcare Global, Somatom Emotion Duo Eco). Statistical analysis was done through the standard Statistical Package for the Social Sciences (SPSS Inc., Chicago, IL, USA) version 15 for windows. MDCTU established the correct cause of microscopic hematuria in (44; 88%) of participants. In (6; 12%) of participants, no cause of hematuria was identified based on the standard of references. The causes of hematuria in (41; 82%) participants were diseases in the upper urinary tract, while urinary bladder neoplasms (2; 4%) and diverticulum (1; 2%) were the causes of hematuria (3; 6%) in the lower urinary tract. Thirty two-row MDCTU scanner demonstrated satisfactory results in the investigation of microscopic hematuria, being able to demonstrate a wide spectrum of diseases affecting the urinary tract is the main advantage of the technique.
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