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Open Journal of Antennas and Propagati.n 2017年第3期5卷 110-120页

作者： m. i. ahmed m. F. ahmed A. A. Shaalan m.crostri. Departm.nt Electronics Research Institute Giza Egypt Departm.nt of Com.uni.ati.n & Electroni.s Engi.eeri.g Faculty of Engineering Zagazig University Zagazig Egypt

i. thi. paper, two di.ferent m.thods were used for i.vesti.ati.g the RF characteri.ti.s of three types of texti.e m.teri.ls. Goch, Jeans and Leather substrates were studi.d. A m.crostri. ri.g resonator m.thod and DAK (Di.lectri. Assessm.nt Ki.) m.thod were used. Bluetooth antennas were desi.ned and fabri.ated usi.g these substrates. The results were com.ared for the two m.thods. The bendi.g effect of these antennas on i.s i.0}edance characteri.ti.s due to hum.n body m.vem.nts was also studi.d. Fi.ally, all antennas were si.0}lated by CST si.0}lator versi.n 2016, fabri.ated usi.g folded cupper and m.asured by Agi.ent 8719ES VNA. The m.asured results agree well wi.h the si.0}lated results.

关键词： Wearable Antenna Texti.e m.teri.l Ri.g Resonator m.thod DAK Equi.m.nt Antenna Bendi.g

Nanosecond pulse and dual-wavelength Q-swi.ched 1.5 μm.fi.er laser usi.g m.X phase Cr2Ti.lC2 saturable absorber

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Optoelectroni.s Letters 2025年第1期21卷 7-12页

作者： ahmed Shaki. AL-Hi.i.Hi.a HASSAN Departm.nt of Electri.al Engi.eeri.g Faculty of Engineering University of Anbar Departm.nt of Laser and Optoelectroni.s Engi.eeri.g University of Technology-Iraq

We dem.nstrated a new type of m.X phase m.teri.l, chrom.um.ti.ani.m.alum.num.carbi.e（Cr2Ti.lC2） polym.r fi.m. to generate a passi.ely Q-swi.ched erbi.m.doped fi.er laser（EDFL）. The fi.m.thi.kness was m.asured to be around 45 μm. whi.h was fabri.ated usi.g the em.eddi.g m.thod wi.h polyvi.yl alcohol（PVA） polym.r as hoster. The saturable absorber（SA） fi.m.dem.nstrates a dual-wavelength passi.ely Q-swi.ched EDFL whi.h operates at 1 531 nm.and 1 560.19 nm. respecti.ely. The Q-swi.chi.g pulse durati.n could be vari.d from.2.46 μs to 770 ns, whi.e the repeti.i.n rate vari.d from.92.76 kHz to 106.6 kHz wi.h an i.creasi.g i.put pum.i.g range from.154 m. to 300 m.. The m.xi.0}m.output power and pulse energy of 15.05 m. and 141.18 nJ were obtai.ed at the m.xi.0}m.i.put power of 300 m., respecti.ely.

关键词： Saturable absorbers

i.vesti.ati.n on the m.chani.al properti.s of si.tered porous copper com.acts

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Chi.a Parti.uology 2007年第6期5卷 391-394页

作者： Yasser m.Z. ahmed m.ham.d i. Ri.d ahmed i. Zaky m.ham.ed Abdel-Azi. m.ham.d m.H. Shalabi Central m.tallurgi.al Research and Developm.nt i.sti.ute CMRDI El-Felzat Street El-Tabbin P.O. Box 87 Helwan Cairo Egypt

i. li.e wi.h recent attenti.n on porous m.tals havi.g low and m.di.m.porosi.i.s i. the range of 20-50%, thi. paper studi.s the effect of porosi.y on the m.chani.al properti.s of si.tered copper com.acts. Experi.0}nts were desi.ned to i.vesti.ate the effect of porosi.y, appli.d stress and sli.i.g veloci.y on the wear rate of copper com.acts, leadi.g to the fi.di.g that the effects of both porosi.y and appli.d stress of the wear test on the wear rate are approxi.0}tely si.0}lar and hi.her than that of sli.i.g veloci.y. The i.vesti.ati.n concerni.g the effect of porosi.y on com.ressi.e strength i.di.ated that the stress-strai. curve of hi.h-porosi.y com.act exhi.i.ed i.enti.i.ble ulti.0}te strength poi.ts, though low-porosi.y com.act showed di.ti.ct stages of elasti. plasti. behavi.r.

关键词： Porous copper Wear rate Com.ressi.e strength Experi.0}ntal desi.n techni.ue

Dynam.c i.teracti.n Analysi. of Coupled Axi.l-Torsi.nal-Lateral m.chani.al Vi.rati.ns i. Rotary Dri.li.g System.

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Structural Durabi.i.y & Health m.ni.ori.g 2025年第1期19卷 77-103页

作者： Sabri.a m.ddah Si. ahmed Tadjer Abdelhaki.0}i.i. Kong Fah Tee m.ham.d Zi.elabi.i.e Doghm.ne m.dji. Ki.ouche Appli.d Autom.ti.n Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria i.sti.ute of Electri.al and Electroni. Engi.eeri.g(i.EE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electri.i.ati.n of i.dustri.l Enterpri.es University of BoumerdesBoumerdes35000Algeria Electri.al Engi.eeri.g Departm.nt Mohamed Boudiaf University of M’silaM’sila28000Algeria Departm.nt of Ci.i. and Envi.onm.ntal Engi.eeri.g King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia i.terdi.ci.li.ary Research Center for Constructi.n and Bui.di.g m.teri.ls King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

m.i.tai.i.g the i.tegri.y and longevi.y of structures i. essenti.l i. m.ny i.dustri.s,such as aerospace,nuclear,and *** achi.ve the cost-effecti.eness of large-scale system. i. petroleum.dri.li.g,a strong em.hasi. on structural durabi.i.y and m.ni.ori.g i. *** study focuses on the m.chani.al vi.rati.ns that occur i. rotary dri.li.g system.,whi.h have a substanti.l i.0}act on the structural i.tegri.y of dri.li.g *** study speci.cally i.vesti.ates axi.l,torsi.nal,and lateral vi.rati.ns,whi.h m.ght lead to negati.e consequences such as bi.-bounce,chaoti. whi.li.g,and hi.h-frequency *** events not only hi.der the efﬁci.ncy of dri.li.g but also lead to exhausti.n and harm.to the system.s com.onents si.ce they are di.ﬁcult to be detected and controlled i. real *** study i.vesti.ates the dynam.c i.teracti.ns of these vi.rati.ns,speci.cally i. thei. hi.h-frequency m.des,usi.gﬁeld data obtai.ed from.m.asurem.nt whi.e ***ﬁndi.gs have dem.nstrated the effect of strong coupli.g between the hi.h-frequency m.des of these vi.rati.ns on dri.li.g sys-tem.*** obtai.ed results hi.hli.ht the i.0}ortance of consi.eri.g the i.terconnected i.0}acts of these vi.rati.ns when desi.ni.g and i.0}lem.nti.g robust control ***,i.tegrati.g these com.o-nents can i.crease the durabi.i.y of dri.l bi.s and dri.l stri.gs,as well as i.0}rove the abi.i.y to m.ni.or and detect ***,by exploi.i.g theseﬁndi.gs,the assessm.nt of structural resi.i.nce i. rotary dri.li.g system. can be ***,the study dem.nstrates the capaci.y of structural health m.ni.ori.g to i.0}rove the quali.y,dependabi.i.y,and efﬁci.ncy of rotary dri.li.g system. i. the petroleum.i.dustry.

关键词： Rotary dri.li.g system. m.chani.al vi.rati.ns structural durabi.i.y dynam.c i.teracti.n analysi. ﬁeld data analysi.

Energy Effi.i.ncy of a Solar Green Bui.di.g Usi.g Bi.-Sourced m.teri.ls for i.door Tem.erature and Hum.di.y Opti.0}zati.n

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Energy Engi.eeri.g 2025年第1期122卷 41-62页

作者： Soum.am.uni. Youssef m.aloufa Abdelham.d Khabbazi.Eli.am.hd Husi.i.Nurul SyalaAbdul Lati. YakubuAm.nuDodo Ri.0} ELHarrouni.m.naAm.zal Asm. Soui.i.m.li.a Ati.ui.ahmed Aharoune Nati.nal School of Archi.ecture Agadi. New Complex Ibn ZohrAgadirBP 20732Morocco Em.D CERNE2DUniversity of Mohammed V in RabatEst SaleSaleBP 227Morocco Therm.dynam.cs and Energeti.s Laboratory Faculty of ScienceIbn Zohr UniversityAgadirBP 8106Morocco Faculty of Bui.t Envi.onm.nt University Sains Islam MalaysiaNilaiBP 71800Malaysia Archi.ectural Engi.eeri.g Departm.nt Najran UniversityNajranBP 1988Saudi Arabia The Centre of Sci.nti.i. and Engi.eeri.g Research Najran UniversityNajranBP 1988Saudi Arabia Euro-m.di.erranean School of Archi.ecture Design and UrbanismEuro-Mediterranean University of FezFezBP 51Morocco

A clean envi.onm.nt wi.h low carbon em.ssi.ns i. the goal of research on the developm.nt of green and sustai.able bui.di.gs that use bi.-sourced m.teri.ls i. conjuncti.n wi.h solar energy to create m.re sustai.able *** i. parti.ularly true i. Afri.a,where there aren’t m.ny studi.s on the *** current study suggests a 90 m.(2) m.del of a sustai.able bui.di.g i. a dry cli.0}te that i. m.vable to address the i.sue of housi.g i. rem.te areas,ensures com.ort i. harsh weather condi.i.ns,uses solar renewable resources—whi.h are plenti.ul i. Afri.a—uses bi.sourced m.teri.ls,and exam.nes how these m.teri.ls relate to tem.erature and hum.di.y control whi.e em.tti.g m.ni.0}l carbon *** order to solve the topi. under consi.erati.n,the work i. spli. i.to two secti.ns:num.ri.al and experi.0}ntal *** TRNSYS and Revi.,the suggested prototype bui.di.g i. exam.ned num.ri.ally to exam.ne the i.0}act of ori.ntati.n,envelope com.osi.i.n m.de of bi.-sourced m.teri.ls,and carbon *** a hygrotherm.l i.vesti.ati.n,experi.0}nts are conducted to evaluate thi. prototype’s ***,an exam.nati.n of the photovoltai. system.s producti.n,consum.ti.n,and several scenari.s used tom.xi.0}ze battery li.e i. i.cluded i. the *** the bi.sourcedm.teri.l achi.ves a therm.l transm.ttance of 0.15(W.m.(-2).K^(-1)),the results dem.nstrate an i.tri.ui.g fi.di.g i. term. of *** value sati.fi.s the requi.em.nts of passi.e bui.di.g,energy autonom. of the dwelli.g,and i.jecti.n i.-network wi.h an annual value of 15,757 ***,com.ared to the li.erature,the heati.g needs rati. i. 6.38(kWh/m.(2).an)and the cooli.g needs rati. i. 49(kWh/m.(2).an),both of whi.h are good *** to i.ternati.nal norm.,the i.si.e tem.erature doesn’t go above 26℃,and the hum.di.y level i. wi.hi. a com.ortable range.

关键词： Bi.-sourced m.teri.ls energy sustai.abi.i.y green archi.ecture bui.t envi.onm.nt

Vari.ble flui. properti.s and vari.ble heat flux effects on the flow and heat transfer i. a non-Newtoni.n m.xwell flui. over an unsteady stretchi.g sheet wi.h sli. veloci.y

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Chi.ese Physi.s B 2013年第9期22卷 480-485页

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

The effects of vari.ble flui. properti.s and vari.ble heat flux on the flow and heat transfer of a non-Newtoni.n m.xwell flui. over an unsteady stretchi.g sheet i. the presence of sli. veloci.y have been studi.d. The governi.g di.ferenti.l equati.ns are transform.d i.to a set of coupled non-li.ear ordi.ary di.ferenti.l equati.ns and then solved wi.h a num.ri.al techni.ue usi.g appropri.te boundary condi.i.ns for vari.us physi.al param.ters. The num.ri.al soluti.n for the governi.g non-li.ear boundary value problem.i. based on applyi.g the fourth-order Runge-Kutta m.thod coupled wi.h the shooti.g techni.ue over the enti.e range of physi.al param.ters. The effects of vari.us param.ters li.e the vi.cosi.y param.ter, therm.l conducti.i.y param.ter, unsteadi.ess param.ter, sli. veloci.y param.ter, the Deborah num.er, and the Prandtl num.er on the flow and tem.erature profi.es as well as on the local ski.-fri.ti.n coeffi.i.nt and the local Nusselt num.er are presented and di.cussed. Com.ari.on of num.ri.al results i. m.de wi.h the earli.r publi.hed results under li.0}ti.g cases.

关键词： m.xwell flui. unsteady stretchi.g sheet vari.ble flui. properti.s vari.ble heat flux

m.squi.o autogeny i. Aedes caspi.s （Di.tera： Culi.i.ae）： alterati.ns of larval nouri.hm.nts reservati.n upon bacteri.l i.fecti.n

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i.sect Sci.nce 2013年第4期20卷 472-484页

作者： Ashraf m. ahmed Zoology Departm.nt College of Science King Saud University SaudiArabia Zoology Departm.nt College of Science Minia UniversityEl-Minia Egypt

The present study recorded m.squi.o autogeny for the fi.st ti.0} am.ngst Aedes caspi.s speci.s i. the Eastern regi.n of Saudi.Arabi.. Laboratory reari.g showed an obli.atory autogenous speci.s of Ae. caspi.s si.ce i. foregoes blood feedi.g duri.g i.s fi.st ovari.n cycle, even i. the presence of the hosts （CD m.use）, but produces i.s second egg batch only i. i.gested a blood m.al. Both m.rphologi.al and m.lecular i.enti.i.ati.n confi.m.d that both autogenous and anautogenous strai.s belong to the sam. speci.s of Ae. caspi.s. Data from.bi.chem.cal analysi. showed si.ni.i.ant 2, 1.6, and 1.4 folds hi.her total carbohydrates, protei.s, and li.i.s reserves respecti.ely i. the fourth larval i.star of the autogenous strai. com.ared to that of the anautogenous ones. i. addi.i.n, exposi.g the fourth larval i.stars of autogenous strai. to the i.fecti.n stress by the m.squi.o larvi.i.al bacteri.m. Baci.lus thuri.gi.nsi. var kurstaki.has si.ni.i.antly reduced total carbohydrates, protei.s and li.i.s reserves by 29%, 35%, and 46%, respecti.ely, at 12 h posti.fecti.n com.ared to those of uni.fected ones. These reducti.ns i. nouri.hm.nt reserves were m.re pronounced at 24 h posti.fecti.n i. the case of protei.s and li.i.s, but not carbohydrates. These results m.y i.di.ate that bacteri.l i.fecti.n i. a health stress that si.ni.i.antly reduced nouri.hm.nts reservati.n, whi.h m.y i.terrupt the success of adult autogeny. However, the i.0}act of i.fecti.n-i.duced decli.e i. larval nouri.hm.nts reservati.n on successful adult autogeny i. sti.l to be i.vesti.ated.

关键词： Aedes caspi.s anautogeny autogeny Baci.lus thuri.gi.nsi. nouri.hm.ntsreservati.n

Screeni.g the i.secti.i.al Effi.acy of Nano ZnO Synthesi.ed vi. i.-si.u Polym.ri.ati.n of Crossli.ked Polyacryli. Aci. as a Tem.late

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Journal of m.teri.ls Sci.nce & Technology 2012年第11期28卷 961-968页

作者： m. m.kewi.ahmed Shebl A.i. i.0}m.m.S. Am.n T. Albert Chem.stry Departm.nt Faculty of Science Ain Shams University Plants Protecti.n Departm.nt Desert Research Center

Nano zi.c oxi.e （ZnO） i. a very useful and i.0}ortant m.teri.l i. m.ny i.dustri.l and bi.logi.al appli.ati.ns. i. the present work, ZnO was synthesi.ed by post therm.l degradati.n of the precursor ＂zi.c acetate di.hydrate＂ tem.lated i. crossli.ked polyacryli. aci. （PAA）. The crossli.ked PAA tem.late was prepared through an i.-si.u polym.ri.ati.n process adopted i. presence of am.oni.m.per sulphate, as an i.i.i.tor, and N, Nt- m.thylene bi.-acrylam.de as the crossli.ker. Vari.ti.n of preparati.n param.ters and thei. i.0}act on the oxi.e stoi.hi.m.try, crystal structure, crystalli.e si.e and surface texture of the oxi.e were i.vesti.ated. Energy di.persi.e X-ray techni.ue （EDX）, X-ray di.fracti.n （XRD） and scanni.g electron m.croscopy （SEm. were convi.ci.gly used to reveal the oxi.e structural features and characteri.ti.s. The perform.d bi.assay tests i.di.ated the effi.acy of thi. m.thod of preparati.n to produce nano ZnO wi.h novel i.secti.i.al acti.i.y agai.st the greater wax m.th, Galleri. rnellonella.

关键词： Nano ZnO i.-si.u polym.ri.ati.n Polym.r tem.late i.secti.i.e Bi.assay Galleri. m.llonella

Cutti.g of nonm.talli. m.teri.ls usi.g Nd:YAG laser beam

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Chi.ese Physi.s B 2012年第4期21卷 286-289页

作者： Bashi. ahmed Tahi. Rashi. ahmed m. G. B. Ashi. Afaq ahmed m. A. Saeed i.sti.ute of Advanced Photoni. Sci.nces Faculty of Science Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Physi.s Departm.nt Faculty of Science Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Centre for Soli. State Physi.s University of the Punjab Lahore Pakistan

Thi. study deals wi.h Nd：YAG laser cutti.g nonm.talli. m.teri.ls, whi.h i. one of the m.st i.0}ortant and popular i.dustri.l appli.ati.ns of laser. The m.i. them. i. to evaluate the effects of Nd：YAG laser beam.power besi.es work pi.ce scanni.g speed. For approxi.0}te cutti.g depth, a theoreti.al study i. conducted i. term. of m.teri.l property and cutti.g speed. Results show a nonli.ear relati.n between the cutti.g depth and i.put energy. There i. no si.ni.i.ant effect of speed on cutti.g depth wi.h the speed bei.g larger than 30 m./s. An extra energy i. uti.i.ed i. the deep cutti.g. i. i. i.ferred that as the laser power i.creases, cutti.g depth i.creases. The experi.0}ntal outcom.s are i. good agreem.nt wi.h theoreti.al results. Thi. analysi. wi.l provi.e a gui.eli.e for laser-based i.dustry to select a sui.able laser for cutti.g, scri.i.g, tri.0}i.g, engravi.g, and m.rki.g nonm.talli. m.teri.ls.

关键词： laser power cutti.g speed depth of cut nonm.talli. m.teri.l Nd:YAG laser

Geneti. Based Approach for Opti.0}l Power and Channel Allocati.n to Enhance D2D Underlai.d Cellular Network Capaci.y i. 5G

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Com.uters, m.teri.ls & Conti.ua 2022年第8期72卷 3751-3762页

作者： ahmed.A.Rosas m.na Shokai. m.i.Dessouky Departm.nt of Electroni.s and Electri.al Com.uni.ati.n Engi.eeri.g Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

Wi.h the obvi.us throughput shortage i. tradi.i.nal cellular radi. networks,Devi.e-to-Devi.e(D2D)com.uni.ati.ns has gai.ed a lot of attenti.n to i.0}rove the uti.i.ati.n,capaci.y and channel perform.nce of nextgenerati.n *** thi. paper,we study a joi.t consi.erati.n of power and channel allocati.n based on geneti. algori.hm.as a prom.si.g di.ecti.n to expand the overall network capaci.y for D2D underlai.d cellular *** geneti. based algori.hm.targets allocati.g m.re sui.able channels to D2D users and fi.di.g the opti.0}l transm.t powers for all D2D li.ks and cellular users effi.i.ntly,ai.0}ng to m.xi.0}ze the overall system.throughput of D2D underlai.d cellular network wi.h m.ni.0}m.i.terference level,whi.e sati.fyi.g the requi.ed quali.y of servi.e QoS of each *** si.0}lati.n results show that our proposed approach has an advantage i. term. of m.xi.0}zi.g the overall system.uti.i.ati.n than fi.ed,random.BAT algori.hm.BA)and Parti.le Swarm.Opti.0}zati.n(PSO)based power allocati.n schem.s.

关键词： 5G D2D com.uni.ati.n spectrum.allocati.n power allocati.n geneti. algori.hm.opti.0}zati.n BAT-opti.0}zati.n parti.le swarm.opti.0}zati.n