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Search Results: 1 - 10 of 6016 matches for " Mostafa Ibrahim "
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Genetic Algorithm Based Performance Analysis of Self Excited Induction Generator  [PDF]
Hassan Ibrahim, Mostafa Metwaly
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.38105
Abstract: This paper investigates the effects of various parameters on the terminal voltage and frequency of self excited induction generator using genetic algorithm. The parameters considered are speed, capacitance, leakage reactance, stator and rotor resistances. Simulated results obtained using genetic algorithm facilitates in exploring the performance of self-excited induction generator. The paper henceforth establishes the application of user friendly genetic algorithm for studying the behaviour of self-excited induction.
Assessment of the Nutritional Status of the Egyptian Patient with End Stage Liver Disease Prior to Liver Transplantation  [PDF]
Waheed A. Monsef, Ibrahim Mostafa, Doaa Zaky
Open Journal of Gastroenterology (OJGas) , 2014, DOI: 10.4236/ojgas.2014.44024
Abstract: Background and Aim: Patients with advanced liver disease have several risk factors to develop nutritional deficiencies. Accurate nutritional assessment is a real challenge because many of the traditionally measured parameters of nutritional status vary with severity of liver disease independently of nutritional status. The objective of this study was to assess the Egyptian patients with end stage liver disease and to compare different tools used to assess their nutritional status. Patients and Methods: 60 patients were nutritionally assessed by SGA, RFH-SGA anthropometry, handgrip dynamometry and biochemical tests. Clinical variables were cross analyzed with the nutritional assessment methods. Results: Malnutrition ranged from 7% by BMI and 100% by SGA. Agreement among all the methods was low compared with the SGA. Correlation between Malnutrition prevalence and the severity of liver disease was verified using Child-Pugh score more than MELD score. Conclusion: Malnutrition is highly prevalent among the Egyptian patients with end stage liver disease prior to liver transplantation. Although the diagnosis of nutritional status is not easy among this category of patients, it varied according to the method used. Nutritional support should be an important part of the preoperative care of liver transplantation patients.
Sustainable Architectural Design: Reviving Traditional Design and Adapting Modern Solutions
Ibrahim Mostafa El Demery
Archnet-IJAR : International Journal of Architectural Research , 2010,
Novel Imaging Enhancements in Capsule Endoscopy
Mostafa Ibrahim,Andre Van Gossum
Gastroenterology Research and Practice , 2013, DOI: 10.1155/2013/304723
Abstract: Video capsule endoscopy that was launched 10 years ago has become a first-line procedure for examining the small bowel. The most common indications for capsule endoscopy are obscure gastrointestinal bleeding, Crohn's disease, polyposis syndromes, and evaluation of patients with complicated celiac disease. The ideal capsule should improve the quality of the image and have a faster frame rate than the currently available one. There should be a therapeutic capsule capable of performing a biopsy, aspirating fluid, delivering drugs, and measuring the motility of the small bowel wall. Another major leap forward would be the capability of remote control of capsule's movement in order to navigate it to reach designated anatomical areas for carrying out a variety of therapeutic options. Technology for improving the capability of the future generation capsules almost within grasp and it would not be surprising to witness the realization of these giant steps within the coming decade. In this review we will focus on the current clinical applications of capsule endoscopy for imaging of the small bowel and colon and will additionally give an outlook on future concepts and developments of capsule endoscopy. 1. Introduction Small bowel capsule endoscopy (SBCE) was introduced 13 years ago. To date, multiple CE systems from different companies are available. Currently the Given M2A Video Capsule System (Given Imaging Ltd., Yokneam, Israel), the Olympus EndoCapsule (Olympus, Tokyo, Japan), and the MiroCam (Intromedic, Seoul, Korea) are FDA and CE approved. Capsule systems are available for examination of the esophagus, small bowel, and colon. Capsule endoscopy is easily ingested and swallowed by most individuals, but also, a capsule-loading device (AdvanCE, US Endoscopy, Mentor, OH, USA) is available to directly deliver the capsule into the stomach or duodenum. The disposable device is a 2.5?mm single-sheathed device that is first preloaded through the working channel of a standard endoscope. The main indications for SBCE include obscure GI bleeding, Crohn’s disease, and celiac disease [1]. 2. Patient Preparation There are several accepted preparation methods for SBCE for small bowel CE, which include fasting since the day before, clear liquid diet, the ingestion of 2–4 liters of polyethylene glycol solution. In addition, some experts recommend the use of simethicone before the ingestion of the capsule to reduce intraluminal foam and bubbles [2]. 3. Indications 3.1. Obscure Gastrointestinal Bleeding Many reports have shown a statistically significant increased diagnostic
Generalised versus Regional Odontodysplasia: Diagnosis, Transitional Management, and Long-Term Followup—A Report of 2 Cases
Mostafa Ibrahim Mostafa,Nehad Samir Taha,Mennat Allah Ismail Mehrez
Case Reports in Dentistry , 2013, DOI: 10.1155/2013/519704
Forced Convection Flow of Nanofluids Past Power Law Stretching Horizontal Plates  [PDF]
Fekry Mohamed Hady, Fouad Sayed Ibrahim, Hassan Mohammed Hassan El-Hawary, Ahmed Mostafa Abdelhady
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.32019
Abstract: In the present work, we studied a nonsimilar solution of steady forced convection boundary layer flow and heat transfer of a nanofluid past a stretching horizontal plate. One-phase model has been used for this study. The nonsimilarity equations are solved numerically. We considered a nanofluid consists of AL2O3 as a nanoparticles and water as a base fluid. The volume fraction of nanoparticles is considered in the range 0 ≤ ? ≤ 0.2. with prandtl number pr = 6.2 for the water working as a regular fluid. The parameters which governing the solution are volume fraction of nanoparticles , stretching plate parameter ξ and power law index N. We investigated the effect of these parameters on the skin friction coefficient, Nusselt number, velocity and temperature profiles. We found that heat transfer rate and skin fraction increased when ? increased. On the other hand, we concluded that the increase in ξ and N made heat transfer rate increases and skin fraction decreases.
Preparation and Characterization of Hot-Pressed and Sintered BiPbSrCaCuO Superconductor  [PDF]
Mohamed Mohamed Ibrahim, Nassar Mahmoud Megahid, Mostafa Mohamed Abd El-Raheem, Sayed Mohammed Khalil
New Journal of Glass and Ceramics (NJGC) , 2012, DOI: 10.4236/njgc.2012.22011
Abstract: Powder compacts of the system Bi2–xPbxSr2Ca2Cu3Oy with 0 ≤ x ≤ 0.5 molar ratio using both techniques; isothermal hot pressing and the solid state reaction (sintering). The XRD of the hot pressed powder compacts of the nominal compositions Bi2–xPbxSr2Ca2Cu3Oy showed 2212 and 2223 phases. The resistivity temperature variations belonging to the composition Bi1.8Pb0.2Sr2Ca2Cu3Oy showed metal-superconducting transition at Tons = 143 K for the annealed sample for 24 h. The annealed nominal composition Bi1.5Pb0.5Sr2Ca2Cu3Oy for 18 h showed metal to superconducting transition at 80 K.
Chemical characterization of some substituted hydroxyapatites
Doreya Ibrahim, Amany A Mostafa, Sara Korowash
Chemistry Central Journal , 2011, DOI: 10.1186/1752-153x-5-74
Abstract: The calcium apatite phase forming the main mineral part of bones and teeth [1], contains several ions in different amounts substituting calcium and phosphorus in the HA lattice [2,3]. Whereas, the synthesized hydroxyapatite (Ca10(PO4)6(OH)2, HA) is a pure phase that is well established bone replacement material in orthopaedics and dentistry. These substitutions provoke changes in the HA surface structure and charge, raising its solubility and increasing the ability of synthetic HA to be involved in a natural bone remodeling process. The type and the amount of ionic substitution in the apatite phase of bone varies from ~2-8 wt% in CO3 to minor concentrations in Mg, Na, to the ppm level for trace elements Si, Sr, Zn, Pb. Although these levels of substitutions are small, it is established that these elements are associated with the properties of biological apatites and play a major role in the biochemistry of bone, enamel and dentin [4-6].Hydroxyapatite contains carbonate ions substituting both the phosphate (B-type CHA) and hydroxyl (A-type-CHA) sites of the HA structure. The B-type is the preferential carbonate substitution found in the bone of a variety of species, with the A/B type ratio in the range 0.7-0.9 [7]. A higher value of the A/B ratio is observed in old tissue, compared to young tissue. The presence of B-carbonate in the apatite lattice is responsible for the decrease in its degree of crystallinity increasing thereby its solubility [8].The importance of silicon on bone formation and calcification is tackled by different workers in vitro and in vivo studies: Carlisle et al. demonstrated the important role played by Si in connective tissue metabolism, especially in bone and cartilage [9]. Where, it is essential to the growth and development of biological tissue such as bone, teeth and some invertebrate skeletons. They also reported that, a reduction in Si in bone results in a decrease in the number of osteoblasts [10], osseomatriceal collagen, and glycosami
Marwit Rod El Leqah Quartz Deposits as a Strategic Source of High Purity Quartz  [PDF]
Suzan S. Ibrahim, Mohamed G. Shahien, Ali Q. Seliem, Mostafa R. Abukhadra, Ahmed M. Zayed
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.37005
Abstract: Evaluation of Marwit Rod El Leqah deposit as pegmatite high purity quartz source for advanced applications was conducted through the geological, mineralogical and geochemical studies. Elemental analysis of a representative quartz sample showed that the quartz deposits were classified as medium purity quartz with 99.575% average SiO2 content and about 0.422% (4220 ppm) of accompanied mineral. Field study and petrography investigation using optical polarized transmitted microscope and reflected light microscope revealed that these impurities were mainly found as solid particulates of iron oxide, muscovite, rutile, orthoclase, granitic rafts, and as fluid inclusions as well. Moreover, structural undesirable trace elements were also presented in the quartz sample.
Clinical Characteristics of Headache in Egyptian Patients with Idiopathic Epilepsy  [PDF]
Mohamed A. Sayed, Hazem K. Ibrahim, Alaaeldin Sedky Bekhit, Mohamed N. Thabit, Mostafa Abdelmomen
Journal of Behavioral and Brain Science (JBBS) , 2019, DOI: 10.4236/jbbs.2019.93012
Abstract: Purpose: Headache and epilepsy are common neurological disorders and their relationship is still incompletely known. The purpose of our work was to estimate the most common types of primary headache syndromes and its relation to seizure timing in epileptic patients in Upper Egypt. Patients & Methods: In a cross-sectional study, we evaluated headaches in 100 consecutive patients with idiopathic epilepsy attending the neurology outpatient clinic and the epilepsy clinic at Sohag university hospital by complete medical history, physical and neurologic examination EEG and CT brain. Results: Of our study population, 78% of patients with epilepsy reported headaches. Migraine occurred in 70.6% of patients with headache followed by tension-type headache in 25.58% of patients and other types of headaches occurred in 2.56% of patients. There were 8 patients (10.1%) had a pre-ictal headache, 52 patients (66.5%) had a postictal headache and 39 patients (50%) had an interictal headache. In our study, we found that the occurrence of headache being linked to the female sex, lower mean age, lower mean age at the onset of epilepsy, focal epilepsy, longer duration of epilepsy, high frequency of seizures and the use of polytherapy of antiepileptics. Conclusion: Headache especially migraine is an important comorbidity of epilepsy and should receive more attention especially in female patients, patients with younger age, lower mean age at epilepsy onset, longer duration of the disease, patients on polytherapy, patients with higher frequency of seizures and patients with focal epilepsy.
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