Elminia University

medicine, Egypt

Elminia University

medicine, Egypt
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Mohamed A.-A.A.,Aswan University | El-Gaafary A.A.M.,Elminia University | Mohamed Y.S.,Elminia University | Hemeida A.M.,Aswan University
2016 18th International Middle-East Power Systems Conference, MEPCON 2016 - Proceedings | Year: 2016

This paper presents a new Single/Multi-Objective Optimization algorithm inspired by hunting behavior of Grey Wolves (S/MOGWO). Modification is introduced to enhance the convergence rate of GWO. The proposed algorithm has been applied to minimize the emission grades of deleterious pollutants and to reduce the generating cost individually. Also, the proposed MOGWO is used to generate Pareto-optimal solutions for simultaneous minimization of the environmental pollution emissions along with the economic cost. Furthermore, fuzzy decision approach process is implemented to rank and extract the global Pareto-optimal solutions as the most suitable non-dominated solution. The effectiveness of the proposed methodology is tested on IEEE 30-bus system. The generation and security constraints are incorporated into the objective function to achieve a valid and accurate solution. The comparative study with different other techniques confirms the primacy of the proposed algorithm and its potential to solve the OPF problem in single and multi-objective optimization space. © 2016 IEEE.

Shaban M.,Beni Suef University | Ali M.,Beni Suef University | Abdel-Hady K.,Elminia University | Hamdy H.,Beni Suef University
Current Nanoscience | Year: 2015

In this paper, a facile method to fabricate two-dimensional (2D) Sn nanoparticles is demonstrated. Sn nanoparticles are deposited on porous anodic alumina membrane (PAA) by using thermal vapor deposition (TVD) technique. A set of PAA membranes fabricated under the same conditions was coated with Sn for different periods of time. SEM images showed the formation of hexagonal nanoarrays of Sn around each nanopore following a selective agglomeration growth mechanism on the active dots of the PAA surface. As the deposition time increased from 1 to 3 min, the agglomerated particles height increased from 20 to 75 nm. Moreover, Sn was thermally deposited for 2 min onto PAA substrates of different pore diameters. As the pore diameter increases, the formed Sn particles diameter decreases and their density distribution around each pore is improved, which may be attributed to the dimensions of the active area of the PAA surface. According to reflection spectra, it was found that the oscillation strength of the samples increased as the deposition time increased to 2 min. For the time greater than 2 min, the oscillation strength decreased due to the scattering of light, particularly in the short wavelength region, that caused by the increase of sample roughness. © 2015 Bentham Science Publishers.

Shaban M.,Beni Suef University | Ali M.,Beni Suef University | Abdel-Hady K.,Elminia University | Hamdy H.,Beni Suef University
Micro and Nano Letters | Year: 2015

Self-ordered anodised aluminium oxide membranes can be used as a base for the growth of different nanoarrays. In this reported work, an efficient and effective method is implemented to fabricate highly ordered alumina nanowires (ANWs) covered with a uniform shell of 12±2nm Sn nanoparticles (Sn/ANWs). A two-step anodisation process followed by a selective etching process was used to prepare highly ordered ANWs with diameters smaller than 36 nm. The thermal evaporation technique was used to ensure the deposition of a Sn nanoshell on the fabricated nanowires. The fabricated nanostructures were characterised by energy-dispersive X-ray spectroscopy, X-ray diffraction, field emission-scanning electron microscopy and an ultraviolet-visible-near-infrared spectrophotometer. Analysis of the scanning electron microscopy images showed that the etching rate is 0.73 nm/min and ANWs are obtained after etching the membrane for 110 min. The measured reflection spectra revealed that Sn/ANWs exhibit a redshift of the UV absorption band relative to the ANWs and a reflectance of nearly 100% in the near-infrared region. For optical comparison, glass slides were coated with Sn under the same conditions for 90 and 120 s. The reflection spectrum of the 120 s Sn-coated glass slide shows three modes at 210, 296 and 700 nm because of the excitation and interference of plasmonic waves. © The Institution of Engineering and Technology 2015.

Abdelmotalib H.M.,Elminia University | Kim J.S.,Chonbuk National University | Im I.-T.,Chonbuk National University
Numerical Heat Transfer; Part A: Applications | Year: 2017

In this paper, numerical and experimental analyses of the heat transfer between an immersed heater and a cone bed of sand particles were carried out. A three-dimensional (3D) model using the Eulerian–Eulerian model coupled with the kinetic theory for granular flow was used to simulate heat transfer and the related bed flow characteristics. The effects of different inlet gas velocities, represented by the fluidizing number (the ratio between inlet gas velocity to minimum fluidizing velocity), and different particle-wall boundary conditions on heat transfer and hydrodynamics were investigated. Both the experiments and numerical simulation results showed that the heat transfer coefficient and the bed expansion ratio increased with increasing the inlet gas velocity. For the particle-wall boundary condition, applying the no-slip condition showed the best agreement in the heat transfer coefficient and the bed expansion ratio to the experimental results. © 2017 Taylor & Francis

Abdelmoez W.,Elminia University | Abdelhamid M.,Elminia University | Yoshida H.,Osaka Prefecture University
Recent Patents on Chemical Engineering | Year: 2012

This study presents the extraction of jojoba oil using subcritical water technology. The effect of extraction parameters covering a temperature range of 180-240°C, using seeds with mean particle size ranging from 12 mm to less than 0.5 mm, water to seed ratios of 0.5:1, 1:1, 2:1, and 3:1, and extraction times in the range of 10-50 min was investigated. Moreover, the kinetic as well as the thermodynamic of the extraction process were investigated. The obtained results revealed that the increase in both temperature and the time of extraction while a decrease in particle size generally improved the yield of extraction up to certain limits. The results showed that the optimum extraction conditions were 240°C, 30 minutes, 2:1 water to seed ratio, and 3 mm particle size which gave a maximum extraction yield of 94%. The reaction kinetics could be correlated well with an irreversible consecutive unimolecular-type first order. The apparent activation energy was evaluated to be 82.5 kJ.mol -1. The present work has been filed as a patent with filing number of 2011/2103 (Egyptian Patent Office). © 2012 Bentham Science Publishers.

Abdelmoez W.,Elminia University | Abdelfatah R.,Elminia University | Tayeb A.,Elminia University | Yoshida H.,Osaka Prefecture University
AIChE Journal | Year: 2011

This work represents the extraction of cottonseed oil using subcritical water. The extraction efficiencies of different range temperatures (180-280°C), having mean particle size range from 3 mm to less than 0.5 mm, water:seed ratios of 0.5:1, 1:1, and 2:1, and extraction times in the range of 5-60 min were all investigated. The composition of the extracted oil, using the subcritical water, was analyzed by gas-liquid chromatography and compared with that extracted using traditional hexane extraction. The results showed that the optimum temperature, mean particle size, water:seed ratio, and extraction time were 270°C, <0.5 mm, 2:1, and 30 min, respectively. In addition the extracted oil was identical to that extracted using the traditional hexane method. © 2010 American Institute of Chemical Engineers (AIChE).

Fathi D.,Kyoto University | Fathi D.,Elminia University | Ueki Y.,Kyoto University | Mima T.,Kyoto University | And 4 more authors.
Clinical Neurophysiology | Year: 2010

Objective: To test whether the normal aging itself may change the cortical plasticity in human. Methods: Motor-evoked potentials (MEPs) were measured from 48 right-handed healthy volunteers (age 21-79) before and after the paired associative stimulation (PAS), comprising a single electric stimulus to the right median nerve at wrist and subsequent transcranial magnetic stimulation (TMS) of the left primary motor cortex. Results: The magnitude of MEP increased by PAS in the young and middle but not in the elderly and its change was negatively correlated with the age. Conclusions: These results suggest that the human M1 shows age-dependent reduction of cortical plasticity. Significance: The reduction of the M1 plasticity may be caused by the attenuated responsiveness of intracortical circuits in the M1 and/or disrupted sensorimotor integration within basal ganglia-thalamocortical loop. © 2009 International Federation of Clinical Neurophysiology.

Mohamed A.-A.A.,Aswan University | El-Gaafary A.A.M.,Elminia University | Mohamed Y.S.,Elminia University | Hemeida A.M.,Aswan University
Proceedings of the International Joint Conference on Neural Networks | Year: 2015

This paper introduce a novel design of the static VAR compensator (SVC) controller for damping power system oscillations. A multi layer neural network model tuned by Grey Wolf Optimization algorithm (GWO) is investigated and presented. GWO search algorithm is used to optimized all the connection of weights and biases for the artificial neural network. The proposed approach depends up on the expected wide range of the effective operating conditions of the SVC. Modification is introduced in the proposed optimizer exploration-exploitation balance to enhance its rate of convergence over the original algorithm. The robustness of the proposed controller successfully testing for damping oscillations of two-axis nonlinear single machine infinite bus system. A comparative study for the controller based the classical PI controller have been presented. © 2015 IEEE.

Abdelmoez W.,Elminia University | Nage S.M.,Elminia University | Bastawess A.,Elminia University | Ihab A.,Cairo University | Yoshida H.,Osaka Prefecture University
Journal of Cleaner Production | Year: 2014

The cellulosic nature of agriculture wastes makes them suitable raw materials for conversion processing to produce end products with high value added. The present works described the using of subcritical water technology for the utilization of wheat straw through hydrolysis to produce reducing sugar. The experiments were carried out under different conditions and the optimum hydrolysis parameters were investigated. The results revealed that the optimum conditions for hydrolysis were 190 °C temperature, 30 min hydrolysis time, water to straw ratio of 6/1 and feedstock particle size of 180-355 μm. The maximum obtained yield the reducing sugars (RS) under the optimum hydrolysis condition amounted to 51.5% (as weight percent) of the raw wheat straw. HPLC analysis for the produced RS showed the presence of 3.2% of total RS as glucose and 7.6% as xylose, the balance being other reducing sugars, e.g. arabinose, galactose and probably other oligomers. Finally, the ethanol production from the produced glucose was tested through fermentation process. Based on the obtained results, it was possible to propose a design for a process combining both sugars and bioethanol production. © 2014 Elsevier Ltd. All rights reserved.

Kotb M.A.,Elminia University | Hamdi N.A.,Elminia University | Sobhy S.,Fayoum University
Egyptian Journal of Neurology, Psychiatry and Neurosurgery | Year: 2014

Background: Migraine is a common neurovascular disorder. Visual evoked potential (VEP) changes, between migraineurs and normal subjects, were often conflicting.Objective: Compare VEP (P100) in patients with migraine with and without aura to normal subjects, and the effect of prophylactic treatment.Methods: Visual evoked potential was recorded in 32 patients with migraine and 15 healthy control subjects.Results: P100 amplitude was significantly higher and its latency was significantly longer in patients with migraine compared to control subjects, this difference disappeared in patients with regular prophylactic treatment.Conclusion: Cortical excitability changes may be related to the pathophysiology of migraine and the efficacy of prophylactic treatment. © 2014 Egyptian Society of Neurology, Psychiatry, and Neurosurgery. All rights reserved.

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