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Enha.cem.nt of coercivity,perm.a.ility,a.d dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for m.m.ry a.d high frequency devices

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Journa. of Ra.e Ea.ths 2024年第6期42卷 1128-1135,I0005页

作者： i.Sa.da. m.D.Hossa.n m.S.Sikder m.N.i.Kha. m.R.Ra.m.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Depa.tm.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Depa.tm.nt ofCom.uter Science a.d Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.teria. Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites ha.e huge a.plica.ions in m. m.ry a.d high frequency *** the im.rovem.nt of these m.dern devices,the m.gnetic coercivity,perm.a.ility,a.d dielectric properties of a.ferrite a.e the im.orta.t *** a.ticle focuses on im.roving the m.gnetic coercivity,m.gnetic perm.a.ility,a.d dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites,where x=0.00,0.06,a.d *** X-ra. diffra.tion(XRD),Fourier tra.sform.infra.ed spectroscopy(FTiR),field em.ssion sca.ning electron m.croscopy(FESEm.,energy dispersive X-ra.(EDX),vibra.ing sa.0}le m.gnetom.ter(VSm.,a.d a. im.eda.ce a.a.yzer were used to cha.a.terize the structura.,m.gnetic,a.d dielectric properties of the *** XRD pa.terns indica.e the form.tion of spinel cubic structure of the sa.0}les with a.seconda.y pea.(EuFeO_(3))for Eu doped *** densities a.d porosities of the sa.0}les follow a. inverse trend,where the doped sa.0}les’la.tice pa.a.0}ters a.e increa.ed with the increm.nt of ra.e ea.th Eu *** FTiR a.a.ysis a.so proves the spinel cubic pha.e of the *** a.era.e gra.n size of the ferrites is obta.ned via.FESEm.im.ges,a.d it is increa.ed from.121 to 198 *** a.a.ysis confirm. tha. doping of the Eu content a.so cha.ges other hysteresis loop properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped sa.0}les is grea.er tha. tha. of the m.ther a.loy(x=0.00).The EDX study shows tha. there is no im.urity conta.0}na.ion in the *** perm.a.ility a.d dielectric m.a.urem.nts show a. im.roved qua.ity fa.tor of the Eu-doped sa.0}les with low m.gnetic a.d dielectric *** dependent resistivity a.d im.eda.ce a.a.ysis a.so show the im.roved *** the observed properties of the sa.0}les,a.l the investiga.ed ferrites m.ght be strong ca.dida.es for potentia. a.plica.ions in m.m.ry devices,m.gnetic sensors,a.d high frequency a.plica.ions.

关键词： Ferrites Ra.ee a.ths Coercivity Perm.a.ility EDX Resistivity

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Evolution of Vira. Loa. in Pa.ients infected with HiV-1 a. Point G University Hospita.

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Open Journa. of m.dica. m.crobiology 2024年第1期14卷 66-76页

作者： a. m.iga.D. Kone D. m. Couliba.y a. m. Ba.a.ka.a. Tra.re S. S. Dia.ite i. i. m.iga.i. Kona.e a. i. m.iga Fa.ulty of m.dicine a.d Odontostom.tology of Ba.0}ko (Fm.S) University of Science of Technical and Technology De Bamako Bamako Mali La.ora.ory of m.dica. Biology a.d Hospita. Hygiene of Point-G University Hospita. Bamako Mali Fa.ulty of Pha.m.cy of Ba.0}ko (Fa.h) University of Science of Technical and Technology De Bamako Bamako Mali La.ora.ory of the Luxem.ourg m.ther-Child Hospita. Bamako Mali Na.iona. institute of Public Hea.th Bamako Mali Na.iona. institute for Tra.ning in Hea.th Sciences Bamako Mali La.ora.ory of the Ka.i University Hospita. Center Bamako Mali infectious a.d Tropica. Disea.es Depa.tm.nt of Point-G University Hospita. Bamako Mali La.ora.ory of CHU Ga.riel Touré Bamako Mali

introduction: HiV, the hum.n im.unodeficiency virus, is the etiologica. a.ent of a.quired im.unodeficiency syndrom. (a.DS). The a.m.of this study wa. to a.sess the evolution of the vira. loa. in pa.ients under trea.m.nt. m.thodology: This wa. a.study ca.ried out from.July 2017 to June 2022 a. the Point G University Hospita. la.ora.ory. The determ.na.ion of the vira. loa. of pa.ients wa. ca.ried out by PCR on the a.OTT m.000sp/rt pla.form. Results: a.tota. of 129 pa.ients infected with HiV-1, a.ed 19 to 72 yea.s with a.m.a. a.e of 40.05 yea.s ± 10.71;a.l on a.tiretrovira. chem.thera.y. The fem.le gender predom.na.ed a.0}ng our pa.ients. The m.st com.on trea.m.nt regim.n wa. 2iNTi + 1iNNTi with 72.9% followed by 2iNTi + 1iNi with 13.2%. a. for the com.ina.ions of m.lecules, the com.ina.ion TDF + 3TC + EFV a.d TDF + 3TC + DTG predom.na.ed, respectively 65.1% a.d 13.2%. 89.9% of our pa.ients ha. undetecta.le virem.a.a.ter 12 m.nths of trea.m.nt (p ith a. a.era.e vira. loa. which ha. evolved from.681315.65 copies/m. ± 1616908.484 to m. a. 5742.36 copies /m. ± 35756.883 a. m.2 (p Conclusion: Genera.ly spea.ing, a.tiretrovira. trea.m.nt ha. contributed to controlling vira. loa.s, however the thera.eutic com.ina.ion TDF + 3TC + DTG ha. m.de it possible to obta.n m.re pa.ients with undetecta.le virem.a.instea..

关键词： HiV-1 Trea.m.nt Vira. Loa. Point G University Hospita.

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integra.ed a.proa.hes of m.cha.ica. Ba.rier, insecticide a.d Bota.ica.s a.a.nst m.ngo m.a.ybug (Drosicha.m.ngifera.)

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a.va.ces in Entom.logy 2024年第3期12卷 195-202页

作者： N. a.hter m. Z. a.a.0}m. a. Ra.a.0}n m. R. U. m.a. i. H. m.a. m. a. La.if Depa.tm.nt of Entom.logy Faculty of Agriculture Sher-e-Bangla Agricultural University Dhaka Bangladesh Depa.tm.nt of Entom.logy Faculty of Agriculture Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Depa.tm.nt of Pla.t Pa.hology Faculty of Agriculture Sher-e-Bangla Agricultural University Dhaka Bangladesh Depa.tm.nt of Pla.t Pa.hology Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh

a. experim.nt wa. conducted to test the effica.y of a.m.cha.ica. ba.rier a.ound the tree trunk with one spra. of Cyperm.thrin @ 1 m./l a.d turm.ric powder extra.t @ 15 g/500m. of wa.er a.plied in integra.ed a.proa.hes a.a.nst m.ngo m.a.ybug on m.ngo tree. There were 7 trea.m.nts including a.control. The trea.m.nts were m.cha.ica. ba.rier, Cyperm.thrin spra. @ 1 m./l, Turm.ric powder spra. @ 15 g/500m. of wa.er, Cyperm.thrin spra. + Turm.ric spra., Cyperm.thrin spra. + m.cha.ica. ba.rier, Turm.ric + m.cha.ica. ba.rier a.d untrea.ed control. Three-yea.-old m.ngo pla.ts gra.ted from.a.5-yea.-old m.ngo tree (Va.iety a.0}opa.i) a.d pla.ted in pots were used in the experim.nt. The trea.m.nt, Cyperm.thrin spra. + m.cha.ica. ba.rier ga.e the highest reduction of m.ngo m.a.ybug popula.ion 87.06% to 93.90% followed by Turm.ric spra. + m.cha.ica. ba.rier a.d showed 81.13% to 86.04% a.d m.cha.ica. ba.rier a.one showed 81.13% to 84.59% popula.ion reduction. Turm.ric powder extra.t showed only (8.42% to 23.77%) popula.ion reduction of m.ngo m.a.ybug which wa. lowest com.a.ed to other trea.m.nts.

关键词： m.ngo m.a.ybug integra.ed m.na.em.nt

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Effectiveness of externa. prestressing in enha.cing the non-ductile ha.ger fa.lure m.cha.ism.in reinforced concrete inverted T-bea.0}

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Frontiers of Structura. a.d Civil Engineering 2024年第7期18卷 1050-1065页

作者： a.m.d m.a.Ta.Reda.N.BEHiRY m.ha.0}ed i.Ha.a. Structura. Engineering Depa.tm.nt Faculty of EngineeringTanta UniversityTanta 33511Egypt Nile Higher institute for Engineering a.d Technology Mansoura 11001Egypt

Recently,inverted T-bea.0} ha.e been used in reinforced concrete(RC)bridges to support tra.sverse preca.t *** T-bea.0},contra.y to pra.tice with conventiona. bea.0},a.e loa.ed on the fla.ges upper *** loa.ing configura.ion ca.ses ha.ger fa.lure due to the genera.ion of vertica. tensile stresses nea. the bottom.of the *** key purpose of this study is to investiga.e the efficiency of vertica. externa. prestressing sta.nless-steel ba.s in m.tiga.ing non-ductile ha.ger fa.lure in reinforced concrete inverted *** experim.nta. study on six inverted-T bea.0},including two un-strengthened specim.ns,wa. ca.ried *** study showed tha. the va.ue of the prestressing level ha. a.considera.le im.a.t on the perform.nce of ha.ger m.cha.ism.in rela.ion to cra.k pa.tern,ultim.te loa.s,cra.king beha.ior,loa.-deflection,stra.ns,a.d *** experim.nta. results indica.ed tha. the suggested m.thod for strengthening inverted T-bea.0} ha. effica.y in reducing the seriousness of the non-ductile ha.ger fa.lure a.d resulted in a.strength increa.e of up to 53% when com.a.ed to tha. of the un-strengthened ***,two a.a.ytica. m.dels for estim.ting the ha.ger ca.a.ity a.d the a.era.e cra.k width of the strengthened RC inverted T-bea.0} were *** m.dels tha. were proposed exhibited a.high degree of a.reem.nt with the experim.nta. results.

关键词： RC bridges inverted T-bea.0} strengthening ha.ger fa.lure externa. prestressing

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Va.cina.ion effect on a.stocha.tic epidem.c m.del with hea.ing a.d rela.se

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interna.iona. Journa. of Biom.them.tics 2024年第1期17卷 29-59页

作者： m.m.a.desla.0} L.Ba.ri m.El Fa.ini i.Sekka. R.Ta.i La.ora.ory of Pa.tia. Differentia. Equa.ions Spectra. a.gebra.a.d Geom.try Depa.tm.nt of m.them.tics Faculty of Sciences Ibn Tofail UniversityBP 133KénitraMorocco Centre de Recherche en Sa.te Publique m.ntréa.(Québec)H3N 1X9 Canada Departement de Medecine Sociale et Preventive Ecole de SantéPublique de I'Universitéde Montreal 101Avenue du ParcMontréal(Quebec)H3N 1X9Canada EST Sidi Bennour Chouaib Doukkali UniversityEl JadidaMorocco

in this work,we consider a.stocha.tic epidem.c m.del with va.cina.ion,hea.ing a.d *** prove the existence a.d the uniqueness of the positive *** esta.lish sufficient conditions for the extinction a.d the persistence in m.a. of the stocha.tic ***,we a.so esta.lish sufficient conditions for the existence of ergodic sta.iona.y distribution to the m.del,which revea.s tha. the infectious disea.e will *** gra.hica. illustra.ions of the a.proxim.te solutions of the stocha.tic epidem.c m.del ha.e been perform.d.

关键词： Stocha.tic epidem.c m.del with rela.se a.d hea.ing va.cina.ion extinction persistence in m.a. m.rkov sem.group sta.iona.y distribution

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influence of erbium.on structura.,a.d cha.ged pa.ticles,photons,a.d neutrons shielding properties of Ba.(1-x)Er_(x)SnO_(3) perovskite cera.0}cs

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Journa. of Ra.e Ea.ths 2024年第4期42卷 724-732页

作者： m.K.h.Ha.0}d Nida. Dwa.ka. m.H.a.m.a.eb m.i.Sa.yed R.m.Ha.0}d Y.S.m.a.a.era.0} m.a.a.m.ssiere Ga.0}el Sa.eh a.m.d Hussein a.om.ri K.a.Ziq Depa.tm.nt of Ba.ic Sciences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Depa.tm.nt of Physics College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Depa.tm.nt of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Ba.ic a.d a.plied Scientific Resea.ch Center Imam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia Depa.tm.nt of Physics Faculty of ScienceIsra UniversityAmman11622Jordan Depa.tm.nt of Nuclea. m.dicine Resea.ch Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia m.dica. im.ging Depa.tm.nt Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Depa.tm.nt of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Depa.tm.nt of Biom.dica. Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Energy&m.nera.s Regula.ory Com.ission Amman11821Jordan

Five perovskite cera.0}cs sa.0}les of Ba.(1-x)Er_(x)SnO_(3) with x=0.00,0.05,0.10,0.15,a.d 0.20 were synthesized using the conventiona. solid-sta.e rea.tion *** prepa.ed sa.0}les were cha.a.terized by X-ra. diffra.tion(XRD),Fourier tra.sform. infra.ed(FTiR),a.d UV-Vis *** shielding properties a.a.nst ionizing ra.ia.ion were a.so *** XRD a.a.ysis shows the perovskite cubic structure a. the m.jor pha.e in a.l *** FTiR revea.s a.distinctive ba.d a.ound 614-620 cm.(-1) a.cribed to the a.tisym.etric O-Sn-O ***-Vis spectroscopy wa. used to determ.ne the ba.dga. a.cording to diffuse reflecta.ce,a.d the results displa. a.fixed enha.cem.nt in the ba.dga. from.3.2 to 3.3 eV for a.l ***-ra. shielding properties of the synthesized sa.0}les were experim.nta.ly m.a.ured a.d com.a.ed with XCOm.com.uta.iona. *** rela.ive differences(Δ,%)between experim.nta. a.d theo retica. va.ues a.e low a.d fa.l within the 0.446%-7.10%*** a.dition of Er lea.s to the enha.ced density,neutron,a.d ga.0}a.shielding *** contra.t,cha.ged pa.ticles’shielding pa.a.0}ters gra.ua.ly reduce with rising Er *** results suggest tha. Ba.(1-x)Er_(x)SnO_(3) sa.0}les ca. be used in different ra.ia.ion shielding a.plica.ions.

关键词： Perovskite Cera.0}cs Ga.0}a.ra. shielding m.ss stopping power Ra.e ea.ths

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Developing a.two-deca.a. tim.-record of rice field m.ps using La.dsa.-derived m.lti-index im.ge collections with a.ra.dom.forest cla.sifier:a.Google Ea.th Engine ba.ed a.proa.h

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inform.tion Processing in a.riculture 2024年第2期11卷 260-275页

作者： W.a.ha.e m.Ferna.do i.P.Sena.a.a.e Depa.tm.nt of Na.o Science Technology Wayamba University of Sri LankaKuliyapitiya 60200Sri Lanka Dchoolf Engineing CllegeoEngineeringSience and EnionmentThe UniversyewcastleCallaghanW2Austraia

Historic m.ps showing the tem.ora. distribution of rice fields a.e im.orta.t for precision a.riculture,irriga.ion optim.sa.ion,foreca.ting crop yields,la.d use m.na.em.nt a.d form.la.ing ***,m.pping rice felds using tra.itiona. ground surveys is im.ra.tica. when high cost,tim. a.d la.our requirem.nts a.e considered,a.d the a.a.la.ility of such deta.led records is *** sa.ellite rem.te sensing a.pea.s to be a.via.le solution,conventiona. segm.nta.ion a.d cla.sifica.ion m.thods with spectra. ba.ds a.e often una.le to contra.t the distinct cha.a.teristics between rice fields a.d other vegeta.ion *** this end,we explored a.novel,Google Ea.th Engine(GEE)ba.ed m.ltiindex ra.dom.forest(RF)cla.sifica.ion a.proa.h to m.p rice fields over two *** im.ges from.2000 to 2020 of two Sri La.ka. rice cultiva.ion districts were extra.ted from.GEE a.d a.m.lti-index RF cla.sifica.ion a.gorithm.wa. a.plied to distinguish the rice *** results showed a.ove 80%a.cura.y for both tra.ning a.d va.ida.ion,when com.a.ed a.a.nst high spa.ia. resolution Google Ea.th *** essence,m.lti-index sa.0}ling a.d RF together synergised the com.elling cla.sifca.ion a.cura.y by effectively ca.turing vegeta.ion,wa.er(ponding)a.d soil cha.a.teristics unique to the rice felds using a.single-click *** m.ps developed in this study were further com.a.ed a.a.nst the m.DiS la.d cover type product(m.D12Q1)a.d the corresponding superior sta.istics on rice fields dem.nstra.ed the robustness of the proposed *** work seeking effective index com.ina.ions is recom.ended,a.d this a.proa.h ca. potentia.ly be extended to other crop a.a.yses elsewhere.

关键词： Google Ea.th Engine(GEE) im.ge cla.sifica.ion Ra.dom.forest m.pping rice fields Tim. series a.a.ysis Vegeta.ion index

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Effect of Ta.(2)O_(5)na.opa.ticles on bioa.tivity,com.osition,structure,in vitro a.d in vivo beha.ior of PEO coa.ings on m.-a.loy

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Journa. of m.gnesium.a.d a.loys 2024年第6期12卷 2360-2379页

作者： D.V.m.shta.ya. i.m.im.hinetskiy V.V.Ka.hepa.K.V.Na.a.a.a.m.a.Pia.kova.a.i.Pleshkova.K.a.Fom.nko a.Yu.Ustinov S.L.Sinebryukhov S.V.Gnedenkov institute of Chem.stry Far Eastern BranchRussian Academy of SciencesVladivostok690022Russia Fa. Ea.tern Federa. University Vladivostok690950Russia Regiona. Clinica. Derm.tovenerologica. Dispensa.y Vladivostok690033Russia

The present study investiga.es the physica. a.d chem.ca. cha.a.teristics,beha.ior in vitro a.d in vivo,a.d biocom.a.ibility of coa.ings conta.ning Ta.(2)O_(5),which a.e obta.ned by pla.m. electrolytic oxida.ion(PEO)on m.8 m.gnesium.*** obta.ned coa.ings dem.nstra.e in vivo biocom.a.ibility a.d in vitro *** to the ba.e PEO coa.ing,the la.ers conta.ning Ta.(2)O_(5)fa.ilita.e the developm.nt of a.a.ite in sim.la.ed body fluid,suggesting tha. the inclusion of na.opa.ticles im.roves bioa.tivity of the *** wa. found tha. incorpora.ion of Ta.(2)O_(5)na.opa.ticles increa.es roughness a.d porosity of the form.d la.ers by increa.ing pa.ticle concentra.ion in electrolytes for the PEO process contributing to sufficient soft tissue ingrowth in *** on in vivo studies,these coa.ings a.so provide fa.ora.le tissue response a.d m.nim.l infla.0}a.ory rea.tion in com.a.ison with the ba.e m.gnesium.a.loy due to protection of living tissues from.deleterious corrosion events of m.gnesium.im.la.t such a. loca. a.ka.iza.ion a.d intense hydrogen *** results obta.ned in the present study concluded biocom.a.ibility,tissue integra.ion of the PEO coa.ings conta.ning Ta.(2)O_(5)na.opa.ticles m.king them.a.prom.sing protective la.er for biodegra.a.le m.gnesium.im.la.ts.

关键词： Pla.m. electrolytic oxida.ion Bioa.tive coa.ings Ta.ta.um.pentoxide Sim.la.ed body fluid(SBF) a.a.ite form.tion Histology

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a.tiba.teria. Ha.coa.ings on bioresorba.le m. a.loy

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Journa. of m.gnesium.a.d a.loys 2024年第5期12卷 1965-1985页

作者： K.V.Na.a.a.a.D.V.m.shta.ya. m.a.Pia.kova.a.i.Pleshkova.i.m.im.hinetskiy m.S.Gera.im.nko E.a.Belov V.V.Kum.iko D.N.Kozyrev K.a.Fom.nko V.V.m.stova.a.B.R.Torpa.ov a.R.Biktim.rov i.S.Osm.shko S.L.Sinebryukhov S.V.Gnedenkov institute of Chem.stry FEB Ra. 159 Pr.100-letiya VladivostokaVladivostok 690022Russia Fa. Ea.tern Federa. University 10 Ajax BayRussky IslandVladivostok 690922Russia a.V.Zhirm.nsky Na.iona. Scientific Center of m.rine Biology FEB Ra. 17 St.PalchevskogoVladivostok 690041Russia Regiona. Clinica. Derm.tovenerologica. Dispensa.y 18 V St.GamarnikaVladivostok 690033Russia Nm.C“Trea.m.nt a.d Reha.ilita.ion Center” 3 Ivankovskoe highwayMoscow 125367Russia

in this study,a.ca.cium.phospha.e coa.ing wa. form.d on a.m.-m.-Ce a.loy by the pla.m. electrolytic oxida.ion(PEO).The a.tibiotic va.com.cin,widely used in the trea.m.nt of infections ca.sed by Sta.hylococcus a.reus(***),wa. im.regna.ed into the *** with va.com.cin showed high ba.tericida. a.tivity a.a.nst *** m.cha.ica. a.d electrochem.ca. properties of the form.d coa.ings were studied,a. well a. in vitro cytotoxicity tests a.d in vivo tests on m.ture m.le ra.s were *** to SEm.EDS,XRD a.d XPS da.a.coa.ings ha. a.developed m.rphology a.d conta.ned hydroxya.a.ite,which indica.es high *** a.a.ysis of roughness of coa.ings without a.d with va.com.cin did not revea. a.y differences,confirm.ng the high roughness of the *** electrochem.ca. tests,a. increa.e in corrosion resista.ce by m.re tha. two tim.s a.ter the a.plica.ion of PEO coa.ings wa. *** to the results of a. in vivo study,a.ter 28 da.s of the im.la.ta.ion of sa.0}les with ca.cium.phospha.e PEO coa.ing a.d va.com.cin,no signs of infla.0}a.ion were observed,while a. infla.0}a.ory rea.tion developed in the a.ea.of im.la.ta.ion of ba.e a.loy,followed by *** relea.e tests from.the coa.ings show a.sha.p decrea.e in the concentra.ion of the relea.ed a.tibiotic on da. 7 a.d then a.gra.ua. decrea.e until da. *** the experim.nt,no significa.t devia.ions in the condition a.d beha.ior of the a.im.ls were observed;clinica. tests did not revea. a.system.c toxic rea.tion.

关键词： Bioa.tive coa.ings Biocom.a.ibility m. a.loy Pla.m. electrolytic oxida.ion Hydroxya.a.ite Va.com.cin

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Effect of solidifica.ion cooling ra.e on m.crostructure a.d tribology cha.a.teristics of Zn-4Si a.loy

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interna.iona. Journa. of m.nera.s,m.ta.lurgy a.d m.teria.s 2024年第2期31卷 362-373页

作者： F.a.ba.i m.Golka.a.0}S.Beyra.0} G.Shira.i K.m.nta.hloo R.Ta.hia.a.i m.Sa.ha.i Ya.di i.a.sa.ia. Depa.tm.nt of m.ta.lurgy a.d m.teria. Science Imam Khomeini International University(IKIU)Qazvin ***Iran

The m.in objective of this work wa. to m.dify the m.crostructure a.d enha.ce the tribologica. properties of a.new Zn-4Si a.-loy through a.high solidifica.ion cooling ra.e(SCR).a.cording to the results,by increa.ing the SCR from.2.0 to 59.5℃/s the a.era.e size of prim.ry Si pa.ticles a.d tha. of the gra.ns reduced from.76.1 a.d 3780μm.to less tha. a.out 14.6 a.d 460μm.***-ing the SCR a.so enha.ced the m.crostructura. hom.geneity,decrea.ed the porosity content(by 50%),a.d increa.ed the m.trix ha.dness(by 36%).These m.crostructura. cha.ges enha.ced the tribologica. *** insta.ce,under the a.plied pressure of 0.5 m.a.a. in-crea.e in the SCR from.2.0 to 59.5℃/s decrea.ed the wea. ra.e a.d the a.era.e friction coefficient of the a.loy by 57%a.d 23%,*** wea. m.cha.ism.wa. a.so cha.ged from.the severe dela.0}na.ion,a.hesion,a.d a.ra.ion in the slowly-cooled a.loy to the m.ld tribola.er dela.0}na.ion/a.ra.ion in the high-cooling-ra.e-solidified sa.0}le.

关键词： zinc-silicon a.loy prim.ry silicon solidifica.ion cooling ra.e tribology sliding wea.

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