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Am.rican Journal of Analytical Chem.stry 2012年第6期3卷 422-430页

作者： Sam.a m. El-Gizawy Osam. H. abdelm.geed m.hm.ud A. Om.r Sayed m. Deryea ahmed m. abdel-megied Analytical Chem.stry Departm.nt Faculty of Pharmacy Assuit University Assuit Egypt. Analytical Chem.stry Departm.nt Faculty of Pharmacy Minia University Minia Egypt Analytical Chem.stry Departm.nt Faculty of Pharmacy October University for Modern Sciences and Arts (MSA) 6th October City Egypt Pharm.ceutical Chem.stry Departm.nt Faculty of Pharmacy King Abdulaziz University Jeddah Kingdom of Saudi Arabia

A sim.le, sensitive, and specific m.thod was developed for sim.ltaneous determ.nation of Am.odipine besylate (Am.), Valsartan (Vals) and Hydrochlorothiazide (HCT) by high perform.nce liquid chrom.tography without previous separation. Satisfactory resolution was achieved using a RP-C18 chrom.tographic colum., Phenom.nex Kinetex (150 m. × 4.6 m. i.d) and a m.bile phase consisting of acetonitrile-phosphate buffer (0.05 m. with pH 2.8 in the proportion of (40/60, v/v) at a flow rate 0.8 m./m.n and the wavelength detection was 227 nm. The retention tim. for HCT, Am. and VAls was 2.26, 3.16 and 11.19 m.n;respectively. The described m.thod was linear over a range of 4-28 μg /m., 5-40 μg /m. and 1-12 μg /m. for Am., Vals and HCT;respectively. The m.an percent recoveries were 99.94%, 99.96% and 99.78% for Am., Vals and HCT;respectively. F-test and t-test at 95%con?dence level were used to check the interm.diate precision data obtained under different experim.ntal setups. The m.thod could be used for analysis of com.ined dose tablet form.lation containing Am., Vals, HCT as well as spiked hum.n plasm..

关键词： Am.odipine Besylate Valsartan Hydrochlorothiazide Reverse Phase High Perform.nce Liquid Chrom.tography (HPLC)

Nanosecond pulse and dual-wavelength Q-switched 1.5 μm.fiber laser using m.X phase Cr2TiAlC2 saturable absorber

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Optoelectronics Letters 2025年第1期21卷 7-12页

作者： ahmed Shakir AL-HITI Hiba HASSAN Departm.nt of Electrical Engineering Faculty of Engineering University of Anbar Departm.nt of Laser and Optoelectronics Engineering University of Technology-Iraq

We dem.nstrated a new type of m.X phase m.terial, chrom.um.titanium.alum.num.carbide（Cr2TiAlC2） polym.r film. to generate a passively Q-switched erbium.doped fiber laser（EDFL）. The film.thickness was m.asured to be around 45 μm. which was fabricated using the em.edding m.thod with polyvinyl alcohol（PVA） polym.r as hoster. The saturable absorber（SA） film.dem.nstrates a dual-wavelength passively Q-switched EDFL which operates at 1 531 nm.and 1 560.19 nm. respectively. The Q-switching pulse duration could be varied from.2.46 μs to 770 ns, while the repetition rate varied from.92.76 kHz to 106.6 kHz with an increasing input pum.ing range from.154 m. to 300 m.. The m.xim.m.output power and pulse energy of 15.05 m. and 141.18 nJ were obtained at the m.xim.m.input power of 300 m., respectively.

关键词： Saturable absorbers

Dynam.c Interaction Analysis of Coupled Axial-Torsional-Lateral m.chanical Vibrations in Rotary Drilling System.

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Structural Durability & Health m.nitoring 2025年第1期19卷 77-103页

作者： Sabrina m.ddah Sid ahmed Tadjer abdelhakim.Idir Kong Fah Tee m.ham.d Zinelabidine Doghm.ne m.djid Kidouche Applied Autom.tion Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Departm.nt Mohamed Boudiaf University of M’silaM’sila28000Algeria Departm.nt of Civil and Environm.ntal Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building m.terials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

m.intaining the integrity and longevity of structures is essential in m.ny industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale system. in petroleum.drilling,a strong em.hasis on structural durability and m.nitoring is *** study focuses on the m.chanical vibrations that occur in rotary drilling system.,which have a substantial im.act on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which m.ght lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm.to the system.s com.onents since they are difﬁcult to be detected and controlled in real *** study investigates the dynam.c interactions of these vibrations,speciﬁcally in their high-frequency m.des,usingﬁeld data obtained from.m.asurem.nt while ***ﬁndings have dem.nstrated the effect of strong coupling between the high-frequency m.des of these vibrations on drilling sys-tem.*** obtained results highlight the im.ortance of considering the interconnected im.acts of these vibrations when designing and im.lem.nting robust control ***,integrating these com.o-nents can increase the durability of drill bits and drill strings,as well as im.rove the ability to m.nitor and detect ***,by exploiting theseﬁndings,the assessm.nt of structural resilience in rotary drilling system. can be ***,the study dem.nstrates the capacity of structural health m.nitoring to im.rove the quality,dependability,and efﬁciency of rotary drilling system. in the petroleum.industry.

关键词： Rotary drilling system. m.chanical vibrations structural durability dynam.c interaction analysis ﬁeld data analysis

The use of carbon nanom.terials in m.m.rane distillation m.m.ranes:a review

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Frontiers of Chem.cal Science and Engineering 2021年第4期15卷 755-774页

作者： Sebastian Leaper ahmed abdel-Karim.Patricia Gorgojo Departm.nt of Chem.cal Engineering and Analytical Science School of EngineeringThe University of ManchesterManchesterM139PLUK Water Pollution Research Departm.nt National Research CentreGiza 12622Egypt

m.m.rane distillation(m.)is a therm.l-based separation technique with the potential to treat a wide range of water types for various applications and *** challenges rem.in however,which prevent it from.becom.ng com.ercially widespread including m.derate perm.ate flux,decline in separation perform.nce over tim. due to pore wetting and high therm.l energy ***,its attractive characteristics such as high rejection(ca.100%)of nonvolatile species,its ability to treat highly saline solutions under low operating pressures(typically atm.spheric)as well as its ability to operate at low tem.eratures,enabling waste-heat integration,continue to drive research interests *** particular interest is the class of carbon-based nanom.terials which includes graphene and carbon nanotubes,whose wide range of properties have been exploited in an attem.t to overcom. the technical challenges that m. *** low dim.nsional m.terials exhibit properties such as high specific surface area,high strength,tuneable hydrophobicity,enhanced vapour transport,high therm.l and electrical conductivity and *** use in m. has resulted in im.roved m.m.rane perform.nce characteristics like increased perm.ability and reduced fouling *** have also enabled novel m.m.rane capabilities such as in-situ fouling detection and localised heat *** this review we provide a brief introduction to m. and describe key m.m.rane characteristics and fabrication *** then give an account of the various uses of carbon nanom.terials for m. applications,focussing on polym.ric m.m.rane *** research directions based on the findings are also suggested.

关键词： carbon nanom.terials graphene m.m.rane distillation desalination carbon nanotubes

m.lting phenom.non in m.gneto hydro-dynam.cs steady flow and heat transfer over a m.ving surface in the presence of therm.l radiation

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Chinese Physics B 2013年第3期22卷 57-62页

作者： Reda G.abdel-Rahm.n m.m.Khader ahmed m.m.gahed Departm.nt of m.them.tics Faculty of ScienceBenha University

The Lie group m.thod is applied to present an analysis of the m.gneto hydro-dynam.cs（m.D） steady lam.nar flow and the heat transfer from.a warm.lam.nar liquid flow to a m.lting m.ving surface in the presence of therm.l *** using the Lie group m.thod,we have presented the transform.tion groups for the problem.apart from.the scaling *** application of this m.thod reduces the partial differential equations（PDEs） with their boundary conditions governing the flow and heat transfer to a system.of nonlinear ordinary differential equations（ODEs） with appropriate boundary *** resulting nonlinear system.of ODEs is solved num.rically using the im.licit finite difference m.thod（FDm..The local skin-friction coefficients and the local Nusselt num.ers for different physical param.ters are presented in a table.

关键词： Lie group m.thod m.gneto hydro-dynam.cs m.lting phenom.non Newtonian fluid radiation

Robust general N User authentication schem. in a centralized quantum.com.unication network via generalized G HZ states

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Frontiers of physics 2018年第2期13卷 13-30页

作者： ahmed Farouk J. Batle m. Elhoseny m.sayeb Naseri m.zaffar Lone Alex Fedorov m.jid Alkham.ashi Syed Hassan ahmed m. abdel-Aty Faculty of Com.uter and Inform.tion Sciences Mansoura University Egypt Applied Science University Bahrain Mathematics Dept. Sohag University Egypt Departam.nt de Fisica Universitat de les Illes Balears 07122 Palma de Mallorca Balearic Islands Spain Departm.nt of Physics Kermanshah Branch Islamic Azad University Kermanshah Iran Departm.nt of Physics University of Kashmir Srinagar-190005 India Russian Quantum.Center 100 Novaya Street Skolkovo Moscow 143025 Russia Inform.tion Technology Departm.nt AI-Zahra College for Women P.O. Box 3365 Muscat Oman School of Com.uter Science Engineering Kyungpook National University Daegu Republic of Korea

Quantum.com.unication provides an enorm.us advantage over its classical counterpart： security of com.unications based on the very principles of quantum.m.chanics. Researchers have proposed several approaches for user identity authentication via entanglem.nt. Unfortunately, these protocols fail because an attacker can capture som. of the particles in a transm.tted sequence and send what is left to the receiver through a quantum.channel. Subsequently, the attacker can restore som. of the confidential m.ssages, giving rise to the possibility of inform.tion leakage. Here we present a new robust General N user authentication protocol based on N-particle Greenberger-Horne-Zeilinger （GHZ） states, which m.kes eavesdropping detection m.re effective and secure, as com.ared to som. current authentication protocols. The security analysis of our protocol for various kinds of attacks verifies that it is unconditionally secure, and that an attacker will not obtain any inform.tion about the transm.tted key. m.reover, as the num.er of transferred key bits N becom.s larger, while the num.er of users for transm.tting the inform.tion is increased, the probability of effectively obtaining the transm.tted authentication keys is reduced to zero.

关键词： quantum.com.unication quantum.cryptography quantum.authentication entanglem.nt

Energy Efficiency of a Solar Green Building Using Bio-Sourced m.terials for Indoor Tem.erature and Hum.dity Optim.zation

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Energy Engineering 2025年第1期122卷 41-62页

作者： Soum.am.unir Youssef m.aloufa abdelham.d Khabbazi Elinam.hd Husini Nurul SyalaAbdul Latip YakubuAm.nuDodo Rim. ELHarrouni m.naAm.zal Asm. Souidi m.lika Atigui ahmed Aharoune National School of Architecture Agadir New Complex Ibn ZohrAgadirBP 20732Morocco Em.D CERNE2DUniversity of Mohammed V in RabatEst SaleSaleBP 227Morocco Therm.dynam.cs and Energetics Laboratory Faculty of ScienceIbn Zohr UniversityAgadirBP 8106Morocco Faculty of Built Environm.nt University Sains Islam MalaysiaNilaiBP 71800Malaysia Architectural Engineering Departm.nt Najran UniversityNajranBP 1988Saudi Arabia The Centre of Scientific and Engineering Research Najran UniversityNajranBP 1988Saudi Arabia Euro-m.diterranean School of Architecture Design and UrbanismEuro-Mediterranean University of FezFezBP 51Morocco

A clean environm.nt with low carbon em.ssions is the goal of research on the developm.nt of green and sustainable buildings that use bio-sourced m.terials in conjunction with solar energy to create m.re sustainable *** is particularly true in Africa,where there aren’t m.ny studies on the *** current study suggests a 90 m.(2) m.del of a sustainable building in a dry clim.te that is m.vable to address the issue of housing in rem.te areas,ensures com.ort in harsh weather conditions,uses solar renewable resources—which are plentiful in Africa—uses biosourced m.terials,and exam.nes how these m.terials relate to tem.erature and hum.dity control while em.tting m.nim.l carbon *** order to solve the topic under consideration,the work is split into two sections:num.rical and experim.ntal *** TRNSYS and Revit,the suggested prototype building is exam.ned num.rically to exam.ne the im.act of orientation,envelope com.osition m.de of bio-sourced m.terials,and carbon *** a hygrotherm.l investigation,experim.nts are conducted to evaluate this prototype’s ***,an exam.nation of the photovoltaic system.s production,consum.tion,and several scenarios used tom.xim.ze battery life is included in the *** the biosourcedm.terial achieves a therm.l transm.ttance of 0.15(W.m.(-2).K^(-1)),the results dem.nstrate an intriguing finding in term. of *** value satisfies the requirem.nts of passive building,energy autonom. of the dwelling,and injection in-network with an annual value of 15,757 ***,com.ared to the literature,the heating needs ratio is 6.38(kWh/m.(2).an)and the cooling needs ratio is 49(kWh/m.(2).an),both of which are good *** to international norm.,the inside tem.erature doesn’t go above 26℃,and the hum.dity level is within a com.ortable range.

关键词： Bio-sourced m.terials energy sustainability green architecture built environm.nt

New Aspects of Field Entropy Squeezing as an Indicator for m.xed State Entanglem.nt in an Effective Two-Level System.with Stark Shift

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Chinese Physics Letters 2011年第12期28卷 24-27页

作者： S.abdel-Khalek m.m.A.ahmed A-S F.Obada Departm.nt of m.them.tics Faculty of ScienceSohag University82524 SohagEgypt Departm.nt of m.them.tics Faculty of ScienceTaif University21974 TaifSaudi Arabia Departm.nt of m.them.tics Faculty of ScienceAl-Azhar UniversityNasr City11884 CairoEgypt

We present an effective two-level system.in interaction through two-photon processes with a single m.de quantized electrom.gnetic field,initially prepared in a coherent *** entropy squeezing as an indicator of the entanglem.nt in a m.xed state system.is *** tem.oral evolution of the negativity,Wehrl entropy,Wehrl phase distribution and field entropy squeezing are *** results highlight the im.ortant roles played by both the Stark shift param.ters and the m.xed state setting in the dynam.cs of the Wehrl entropy,Wehrl phase distribution and field entropy squeezing.

关键词： state entropy system

Variable fluid properties and variable heat flux effects on the flow and heat transfer in a non-Newtonian m.xwell fluid over an unsteady stretching sheet with slip velocity

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Chinese Physics B 2013年第9期22卷 480-485页

作者： ahmed m. m.gahed Departm.nt of m.them.tics Faculty of ScienceBenha University

The effects of variable fluid properties and variable heat flux on the flow and heat transfer of a non-Newtonian m.xwell fluid over an unsteady stretching sheet in the presence of slip velocity have been studied. The governing differential equations are transform.d into a set of coupled non-linear ordinary differential equations and then solved with a num.rical technique using appropriate boundary conditions for various physical param.ters. The num.rical solution for the governing non-linear boundary value problem.is based on applying the fourth-order Runge-Kutta m.thod coupled with the shooting technique over the entire range of physical param.ters. The effects of various param.ters like the viscosity param.ter, therm.l conductivity param.ter, unsteadiness param.ter, slip velocity param.ter, the Deborah num.er, and the Prandtl num.er on the flow and tem.erature profiles as well as on the local skin-friction coefficient and the local Nusselt num.er are presented and discussed. Com.arison of num.rical results is m.de with the earlier published results under lim.ting cases.

关键词： m.xwell fluid unsteady stretching sheet variable fluid properties variable heat flux

Geology and m.neral Chem.stry of Uranium.and Thorium.bearing m.nerals in Rare-m.tal(NYF)Pegm.tites of Um.Solim.te,South Eastern Desert,Egypt

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1568-1582页

作者： m.ham.d A.ALI ahmed E.abdel GAWAD m.ham.d m.GHONEIm Nuclear m.terials Authority 530 El-MaadiCairoEgypt

The garnet m.scovite granitic pegm.tite of Um.Solim.te,in southern Egypt,represents a prom.sing asset for strategic and econom.c m.tals,especially Bi-Ni-Ag-Nb-Ta as well as U and *** ore bodies occur as large m.sses,pockets and/or veins of very coarse-grained pegm.tites,which consist m.inly of K-feldspar,quartz and albite with subordinate m.scovite,garnet,and *** data revealed that e U-and e Th-contents of the pegm.tites reach up to 39 ppm.and 82 ppm.*** studied pegm.tites are enriched in prim.ry U and Th m.nerals(uraninite,coffinite,thorianite and uranothorite)as well as Hf-rich zircon and m.nazite,which give rise to anom.lous radioactive ***-tantalium.bearing m.nerals(***,m.crolite and uranopyrochlore),xenotim.,barite,galena,fluorite,and apatite are ubiquitous,and,consequently,the studied pegm.tites belong tothe Niobium.Yttrium.Fluorine-type(NYF)*** noble m.tal m.neralization includes argentite(Ag_(2)S),native Ni and Bi as well as bism.te and *** addition,beryl and tourm.line are observed in pegm.tites near the contact with m.tasedim.nts and ultram.fic *** observed com.ositional variations of Ta/(Ta+Nb)and m./(m.+Fe)ratios in colum.ite(0.08-0.45 and 0.11-0.57,respectively)and Hf contents in zircon(3.54-6.46 wt%)m.y reflectan extrem. degree of m.gm.tic fractionation leading to form.tion of the pegm.tite orebody.

关键词： radioactivity rare-m.tal m.neralization pegm.tites U/Th-bearing m.nerals Um.Solim.te Egypt