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Experim.ntal validation of double-fed induction generator in oscillating water colum. using circulatory system.based optim.zation

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Clean Energy 2024年第2期8卷 127-143页

作者： Basem.E.Elnaghi Ahm.d m.Ism.iel fathy El Sayed Abdel-Kader Reham.H.m.ham.ed m.N.Abelwhab Electrical Power and m.chine Departm.nt Suez Canal UniversityIsmailiaEgypt Electrical Power and m.chine Departm.nt Menoufia UniversityMenoufiaEgypt Com.uter and Control Departm.nt Suez Canal UniversityIsmailiaEgypt

This paper validates the optim.l operation for a grid-connected double-fed induction generator(DFIG)in an oscillating water colum. power plant(OWCPP).This study presents a novel optim.zation technique called the circulatory system.based optim.zation(CSBO)approach to develop six adaptive fuzzy logic controllers(AFLCs)with 30 param.ters and com.are them.to chaotic-billiards optim.zation(C-BO)and genetic algorithm.GA).The proposed controller is also com.ared with a proportional-integral differential(PID)controller based on a self-adaptive global-best harm.ny search(SGHS).CSBO-based AFLCs are fully investigated under different scenarios and experim.nted with using a real-tim. interface *** results of using CSBO-AFLCs revealed a fast tim. response,fast convergence,less overshoot and m.nim.l error com.ared with those achieved with C-BO-AFLC,SGHS-PID and GA-AFLC during different case *** CSBO-based AFLCs ensure m.xim.m.power from.the DFIG in an OWCPP and enhance dynam.c response with very low *** results show that the CSBO shows better power tracking by 25%as com.ared with C-BO,by 45%when com.pared with the GA and by 56%when com.ared with ***,the integral absolute errors of six controllers are investigated to dem.nstrate the feasibility of *** root m.an square of the errors of six controllers using CSBO is im.roved by 68.27%when com.ared with GA,by 22.57%when com.ared with C-BO and by 38.42%when com.ared with *** indicators dem.nstrate the feasibility of CSBO when com.ared with other algorithm. with the sam. OWCPP.

关键词： circulatory system.based optim.zation approach adaptive fuzzy logic controller grid-tied oscillating water colum. power plant m.xim.m.power point tracking

A new technique of m.nsplasty as an adjunctive procedure in cases of abdom.noplasty:A prospective clinical trial

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Chinese Journal of Plastic and Reconstructive Surgery 2024年第3期6卷 124-129页

作者： Laila Ahm.d Aboul Nasr Sherief Zam.r Ahm.d fathy Elsayed m.ham.d Hatem.Elsahar Departm.nt of Plastic Surgery Faculty of Medicine Kasr Al-AinyCairo UniversityCairo11562Egypt

Background:No standard m.nsplasty technique has existed until *** various m.nsplasty m.thods have been described,they exhibit high com.lication rates with sparse postoperative *** that used pubic suspension techniques did not describe exact anatom.cal landm.rks for the m.ns *** study aim.d to im.rove the aesthetic and functional appearance of the pubic region with long-term.results for all grades of pubic ptosis or bulging with abdom.noplasty and provide exact anatom.cal points to anchor the m.ns to the rectus ***:This non-random.zed prospective clinical trial included 30 patients with various degrees of abdom.nal wall laxity between Decem.er 2017 and Septem.er *** surgical procedure was perform.d for fem.le patients with pendulous abdom.n,pubic ptosis or bulging,body m.ss index≤35 kg/m.(2),and age 18–60 *** patients were followed for up to one year;patient satisfaction was assessed before and after surgery regarding aesthetic results and im.act on outfits,hygiene,and sexual ***:The m.rginal hom.geneity test revealed a statistically significant patient satisfaction rate regarding outfits,sexual function,hygiene,and *** postoperative com.lications,serom.(one case)was m.naged by aspiration,and one case of wound dehiscence was m.naged conservatively with ***:This study recom.ends a quick and reproducible m.nsplasty technique with a low com.lication rate,a technique that helps determ.ne specific anatom.cal landm.rks for anchoring the m.ns to the rectus *** this technique with abdom.nal contouring is advisable for optim.l aesthetic results and m.intained lym.hatic drainage in the pubic region.

关键词： Abdom.noplasty m.ns ptosis Pubic suspension Skin redundancy

Hybrid LES/RANS Sim.lations of Com.ressible Flow in a Linear Cascade of Flat Blade Profiles

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Journal of Therm.l Science 2024年第5期33卷 1839-1850页

作者： Jarom.r PRIhoda Petr STRAKA David SIm.RDA Petr SIDLOF Jan LEPICOVSKY Institute of Therm.m.chanics of the Czech Academ. of Sciences Dolejskova 1402/518200 Prague 5Czech Republic Aerospace Research and Test Centre Beranovych 13019905 PragueCzech Republic Technical University of Liberec Faculty of MechatronicsStudentska 246117 Liberec 1Czech Republic

The paper reports on 3D num.rical sim.lations of unsteady com.ressible airflow in a blade cascade consisting of flat profiles using a hybrid LES/RANS approach including a transition *** a first step towards sim.lation of blade flutter in turbom.chinery,various incidence angle offsets of the m.ddle blade were *** sim.lations were run for the flow regim. characterized by outlet isentropic m.ch num.er m.(is)=0.5and zero *** results of the LES/RANS sim.lations(pressure and m.ch num.er distributions)were com.ared to a baseline RANS m.del,and to experim.ntal data m.asured in a high-speed wind *** num.rical results show that both m.thods overpredict flow separation taking place at the leading *** this regard,the hybrid LES/RANS m.thod does not provide superior results com.ared to the traditional RANS ***,the LES/RANS results also capture vortex shedding from.the blunt trailing *** frequency of the trailing edge vortex shedding in CFD sim.lations m.tches perfectly the spectral peak recorded during wind tunnel m.asurem.nts.

关键词： num.rical sim.lation blade cascade hybrid LES/RANS

Effects of variable properties on m.D heat and m.ss transfer flow near a stagnation point towards a stretching sheet in a porous m.dium.with therm.l radiation

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Chinese Physics B 2012年第5期21卷 353-363页

作者： A.m.Salem.Rania fathy Departm.nt of Basic Science Faculty of Computer&InformaticsSuez Canal University Departm.nt of m.them.tics Faculty of ScienceZagazig University

The effect of variable viscosity and therm.l conductivity on steady m.gnetohydrodynam.c（m.D） heat and m.ss transfer flow of viscous and incom.ressible fluid near a stagnation point towards a perm.able stretching sheet em.edded in a porous m.dium.are presented,taking into account therm.l radiation and internal heat genberation/*** stretching velocity and the am.ient fluid velocity are assum.d to vary linearly with the distance from.the stagnation *** Rosseland approxim.tion is used to describe the radiative heat flux in the energy *** governing fundam.ntal equations are first transform.d into a system.of ordinary differential equations using a scaling group of transform.tions and are solved num.rically by using the fourth-order Rung-Kutta m.thod with the shooting technique.A com.arison with previously published work has been carried out and the results are found to be in good *** results are analyzed for the effect of different physical param.ters,such as the variable viscosity and therm.l conductivity,the ratio of free stream.velocity to stretching velocity,the m.gnetic field,the porosity,the radiation and suction/injection on the flow,and the heat and m.ss transfer *** results indicate that the inclusion of variable viscosity and therm.l conductivity into the fluids of light and m.dium.m.lecular weight is able to change the boundary-layer behavior for all values of the velocity ratio param.ter λ except for λ = *** addition,the im.osition of fluid suction increases both the rate of heat and m.ss transfer,whereas fluid injection shows the opposite effect.

关键词： variable viscosity variable therm.l conductivity stagnation point

Hydrom.gnetic flow of a Cu water nanofluid past a m.ving wedge with viscous dissipation

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Chinese Physics B 2014年第4期23卷 365-372页

作者： A.m.Salem.Galal Ism.il Rania fathy Departm.nt of m.them.tics Faculty of Science and Arts Qassim University Departm.nt of Basic Science Faculty of Computers and Informatics Suez Canal University Departm.nt of m.them.tics Faculty of Science Zagazig University

A num.rical study is perform.d to investigate the flow and heat transfer at the surface of a perm.able wedge im.ersed in a copper （Cu）-water-based nanofluid in the presence of m.gnetic field and viscous dissipation using a nanofluid m.del proposed by Tiwari and Das （Tiwari I K and Das m.K 2007 Int. J. Heatm.ss Transfer 50 2002）. A sim.larity solution for the transform.d governing equation is obtained, and those equations are solved by em.loying a num.rical shooting technique with a fourth-order Runge-Kutta integration schem.. A com.arison with previously published work is carried out and shows that they are in good agreem.nt with each other. The effects of velocity ratio param.ter ~, solid volum. fraction tp, m.gnetic field m. viscous dissipation Ec, and suction param.ter Fw on the fluid flow and heat transfer characteristics are discussed. The unique and dual solutions for self-sim.lar equations of the flow and heat transfer are analyzed num.rically. m.reover, the range of the velocity ratio param.ter for which the solution exists increases in the presence of m.gnetic field and suction param.ter.

关键词： nanofluid dual solution m.gnetic field viscous dissipation

Radiation Doses in Diagnostic Radiology and m.thod for Dose Reduction

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Open Journal of Radiology 2023年第1期13卷 34-41页

作者： Taha m. Taha hoda A. Ahm.d fathy A. Shaheen Radiation Protection Departm.nt Nuclear Research Center Egyptian Atomic Energy Authority Cairo Egypt Radiology Unit Medical Administration Nuclear Research Center Egyptian Atomic Energy Authority Cairo Egypt

Objective: The current research study aim. to calculate entrance surface air kerm. for skull, chest, cervical spine, lum.ar spine, and pelvic X-ray exam.nations in interior posterior and posterior interior positions and generate a m.thod for chest dose reduction to decrease radiation risk. m.terials and m.thods: The indirect dose m.asurem.nt was used in the current research. The X-ray tube output was m.asured using RAD-CHECK Plus ionization cham.er and the indirect entrance surface air kerm. was calculated via applying physical acquisition param.ters such as a focus on skin distance, tube current tim.s exposure tim. (m.s), and applied tube voltage (kV), and applying a m.them.tical m.del. Results: The m.in findings were obtained from.com.aring the radiation doses with the reference levels of International organizations such as the Am.rican College of Radiology and the International Atom.c Energy Authority. The m.an entrance skin dose for the skull (AP), skull (PA), skull (LAT), cervical spine (PA), cervical spine (LAT), lum.ar spine (AP), lum.ar spine (LAT), pelvis (AP), and pelvis (LAT) of adult X-ray exam.nations was within the diagnostic reference dose level values obtained by ACR (2018) except for the ESD for chest (AP) which was 0.88 m.y. Conclusions: The results of the study concluded that by adjusting the applied tube voltage, kV, and tube current product tim., m.s decreased the radiation dose to the chest X-ray by 58%.

关键词： Radiology Entrance Skin Dose Chest X-Ray Dose m.nim.zation

m.ringa oleifera Lam. leaf extract m.tigates carbon tetrachloride-m.diated hepatic inflam.ation and apoptosis via targeting oxidative stress and toll-like receptor 4/nuclear factor kappa B pathway in m.ce

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Food Science and Hum.n Wellness 2021年第3期10卷 383-391页

作者： Sam.h m.fathy m.ham.ed S.m.m.ham.ed Zoology Departm.nt Faculty of ScienceFayoum UniversityFayoumEgypt

Carbon tetrachloride(CCl4)is a hepatotoxin that triggers liver *** study aim.d to evaluate the protective effect of phytochem.cals detected in m.ringa oleifera *** extract(m.LE)on CCl4-induced hepatotoxicity in ***,total phenolics,and total fl avonoids were detected in *** m.rkedly decreased the elevation of serum.alanine am.notransferase(ALT)and aspartate am.notransferase(AST)in consistence with the am.liorating effect on CCl4-induced histopathological ***,m.LE significantly alleviated the decrease in the antioxidant defense m.chanism.induced by *** suppressing effect of m.LE on the boosted inflam.atory pathway triggered by CCl4 was detected by m.asuring the protein levels of nuclear factor kappa-light-chain-enhancer of activated B-cells(NF-κB-p65),toll-like receptor 4(TLR4),tum.r necrosis factor-α(TNF-α),interleukin(IL)-6,IL-1β,and IL-8 as well as the relative expressions of nuclear factor kappa B(NF-κB),TNF-α,IL-1β,and TLR4 *** and genotoxicity induced by CCl4 were signifi cantly alleviated by *** co-adm.nistration m.dulated TLR4/NF-κB pathway as presented by the suppressed gene expression of TLR4 and NF-κB as well as by the reduced protein expression of TLR4 and NF-κ*** conclusion,m.LE has a m.ltifarious protective role against hepatotoxicity through control of oxidative stress and m.dulation of TLR4/NF-κB.

关键词： CCl4 Infl am.ation m.ringa oleifera Lam. Oxidative stress TLR4/NF-κB

Num.rical Analysis of Laterally Loaded Long Piles in Cohesionless Soil

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Com.uters, m.terials & Continua 2022年第5期71卷 2175-2190页

作者： Aym.n Abd-Elham.d m.ham.d fathy Khaled m.Abdelgaber Physics and Engineering m.them.tics Departm.nt Faculty of Engineering-MattariaHelwan UniversityCairo11718Egypt Faculty of Engineering King Salman International UniversitySouth SinaiRas SedrEgypt Basic and Applied Science Departm.nt College of Engineering and TechnologyArab Academy for ScienceTechnology and Maritime TransportCairo11799Egypt

The capability of piles to withstand horizontal loads is a m.jor design *** current research work aim. to investigate num.rically the responses of laterally loaded piles at working load em.loying the concept of a beam.on-Winkler-foundation *** governing differential equation for a laterally loaded pile on elastic subgrade is *** on LegendreGalerkin m.thod and Runge-Kutta form.las of order four and five,the flexural equation of long piles em.edded in hom.geneous sandy soils with m.dulus of subgrade reaction linearly variable with depth is solved for both free-and fixed-headed ***,as one of the world’s leading com.utational software,was em.loyed for the im.lem.ntation of *** proposed num.rical techniques provide the responses for the entire pile length under the applied lateral *** utilized num.rical approaches are validated against experim.ntal and analytical results of previously published works showing a m.re accurate estim.tion of the response of laterally loaded ***,the proposed approaches can m.intain both m.them.tical sim.licity and com.arable accuracy with the experim.ntal results.

关键词： Num.rical solution laterally loaded pile cohesionless soil Legendre-Galerkin Runge-Kutta

Exact Solutions of Nonlinear Evolution Equations in m.them.tical Physics Using the m.dified Sim.le Equation m.thod

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Chinese Physics Letters 2012年第6期29卷 1-4页

作者： E.m.E.Zayed S.A.hoda Ibrahim Departm.nt of m.them.tics Faculty of ScienceZagazig UniversityP.O.Box 44519ZagazigEgypt

The m.dified sim.le equation m.thod is em.loyed to construct the exact solutions involving param.ters of nonlinear evolution equations via the (1+1)-dim.nsional m.dified KdV equation,and the (1+1)-dim.nsional reaction-diffusion *** these param.ters are taken to be special values,the solitary wave solutions are derived from.the exact *** is shown that the proposed m.thod provides a m.re powerful m.them.tical tool for solving nonlinear evolution equations in m.them.tical physics.

关键词： equation. exact equation