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Acta m.them.tica s.nica,Englis. s.ries 1995年第4期11卷 399-407页

作者： E. m. E. Zayed s. f. m. ibrahim m.them.tics.Departm.nt f.culty of.s.ience Zagazig University Zagazig Egypt m.them.tics.Departm.nt f.culty of.s.ience Ain Shams University Heliopolis Cairo Egypt

The object of.this.paper is.to es.ablis. an expans.on theorem.f.r a regular right- def.nite eigenvalue problem.with an eigenvalue param.ter λ which is.contained in the s.hrodinger partial dif.erential,equation and in a general type of.boundary conditions.on the boundary of.an arbitrary m.ltiply connected bounded dom.in in R^n(n≥2).We as.ociate with this.problem.an es.entially s.lf.adjoint operator in a s.itably def.ned Hilbert s.ace and then we develop an as.ociated eigenf.nction expans.on theorem.

关键词： Eigenvalue problem m.ltiply connected dom.in Eigenf.nction expans.on

High-s.cured Im.ge Ls. s.eganography Us.ng AVL-Tree with Random.RGB Channel s.bs.itution

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Com.uters. m.terials.and Continua 2024年第1期81卷 183-211页

作者： Njoum.m. s.laim.n R. s.ukur Z. Qam.r f. Center of.Cyber s.curity Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi 43600 Malaysia Com.uter s.ience and Cyber s.curity Faculty of Engineering and Information Technology BirZeit University Ramallah P.O. Box 14 BirZeit Palestine

Random.pixel s.lection is.one of.the im.ge s.eganography m.thods.that has.achieved s.gnif.cant s.cces. in enhancing the robus.nes. of.hidden data. This.property m.kes.it dif.icult f.r s.eganalys.s. powerf.l data extraction tools.to detect the hidden data and ens.res.high-quality s.ego im.ge generation. However, us.ng a s.ed key to generate non-repeated s.quential num.ers.takes.a long tim. becaus. it requires.s.ecif.c m.them.tical equations. In addition, thes. num.ers.m.y clus.er in certain ranges. The hidden data in thes. clus.ered pixels.will reduce the im.ge quality, which s.eganalys.s.tools.can detect. Theref.re, this.paper propos.s.a data s.ructure that s.f.guards.the s.eganographic m.del data and m.intains.the quality of.the s.ego im.ge. This.paper em.loys.the Adels.n-Vels.y and Landis.(AVL) tree data s.ructure algorithm.to im.lem.nt the random.zation pixel s.lection technique f.r data concealm.nt. The AVL tree algorithm.provides.s.veral advantages.f.r im.ge s.eganography. f.rs.ly, it ens.res.balanced tree s.ructures. which leads.to ef.icient data retrieval and ins.rtion operations. s.condly, the s.lf.balancing nature of.AVL trees.m.nim.zes.clus.ering by m.intaining an even dis.ribution of.pixels. thereby pres.rving the s.ego im.ge quality. The data s.ructure em.loys.the pixel indicator technique f.r Red, Green, and Blue (RGB) channel extraction. The green channel s.rves.as.the f.undation f.r building a balanced binary tree. f.rs., the s.nder identif.es.the colored cover im.ge and s.cret data. The s.nder will us. the two leas. s.gnif.cant bits.(2-Ls.) of.RGB channels.to conceal the data’s.s.ze and as.ociated inf.rm.tion. The next s.ep is.to create a balanced binary tree bas.d on the green channel. Utilizing the channel pixel indicator on the Ls. of.the green channel, we can conceal bits.in the 2-Ls. of.the red or blue channel. The f.rs. f.ur levels.of.the data s.ructure tree will m.s. the data s.ze, while s.bs.quent levels.will conceal the rem.ining digits.of.s

关键词： AVL tree capacity Im.ge s.eganography im.erceptibility peak s.gnal-to-nois. ratio (Ps.R) pixel random.s.lection (PRs.

A s.cure f.am.work f.r Ws.-IoT Us.ng Deep Learning f.r Enhanced Intrus.on Detection

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Com.uters. m.terials.and Continua 2024年第1期81卷 471-501页

作者： Kum.r C.O. Gajendran s. m.rappan s. Zakariah m. Alm.zyad A.s. s.hool of.Com.uter s.ience & Engineering Vellore Institute of Technology Chennai Campus Chennai 600127 India s.hool of.Electronics.& Engineering Vellore Institute of Technology Chennai Campus Chennai 600127 India Departm.nt of.Com.uter s.iences.and Engineering College of Applied Science King Saud University Riyadh 11543 Saudi Arabia Departm.nt of.Com.uter Engineering College of Computer and Information Sciences King Saud University Riyadh 11543 Saudi Arabia

The s.curity of.the wireles. s.ns.r network-Internet of.Things.(Ws.-IoT) network is.m.re challenging due to its.random.es. and s.lf.organized nature. Intrus.on detection is.one of.the key m.thodologies.utilized to ens.re the s.curity of.the network. Conventional intrus.on detection m.chanis.s.have is.ues.s.ch as.higher m.s.las.if.cation rates. increas.d m.del com.lexity, ins.gnif.cant f.ature extraction, increas.d training tim., increas.d run tim. com.lexity, com.utation overhead, f.ilure to identif. new attacks. increas.d energy cons.m.tion, and a variety of.other f.ctors.that lim.t the perf.rm.nce of.the intrus.on s.s.em.m.del. In this.res.arch a s.curity f.am.work f.r Ws.-IoT, through a deep learning technique is.introduced us.ng m.dif.ed f.zzy-Adaptive Dens.Net (m.1}AdaDens.Net) and is.benchm.rked with datas.ts.like Ns.-KDD, UNs.NB15, CIDDs.001, Edge IIoT, Bot IoT. In this. the optim.l f.ature s.lection us.ng Capturing Dingo Optim.zation (CDO) is.devis.d to acquire relevant f.atures.by rem.ving redundant f.atures. The propos.d m.1}AdaDens.Net intrus.on detection m.del of.ers.s.gnif.cant benef.ts.by utilizing optim.l f.ature s.lection with the CDO algorithm. This.res.lts.in enhanced Detection Capacity with m.nim.l com.utation com.lexity, as.well as.a reduction in f.ls. Alarm.Rate (f.R) due to the cons.deration of.clas.if.cation error in the f.tnes. es.im.tion. As.a res.lt, the com.ined CDO-bas.d f.ature s.lection and m.1}AdaDens.Net intrus.on detection m.chanis. outperf.rm.other s.ate-of.the-art techniques. achieving m.xim.l Detection Capacity, precis.on, recall, and f.m.as.re of.99.46%, 99.54%, 99.91%, and 99.68%, res.ectively, along with m.nim.l f.R and m.an Abs.lute Error (m.E) of.0.9% and 0.11. © 2024 The Authors.

关键词： accuracy Deep learning f.ls. alarm.rate f.ature s.lection f.zzy rules intrus.on detection wireles. s.ns.r networks

Evaluating trans.ent behaviour of.large-s.ale photovoltaic s.s.em.0}during lightning events.us.ng enhanced f.nite dif.erence tim. dom.in m.thod with variable cell s.ze approach

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High Voltage 2024年第3期9卷 636-647页

作者： ibrahim Hetita Diaa-Eldin A.m.ns.ur Yang Han Ping Yang Congling Wang m.ham.d m.f.Darwis. m.tti Lehtonen Am. s.Zalhaf s.hool of.m.chanical and Electrical Engineering University of Electronic Science and Technology of China(UESTC)ChengduChina Electrical Power and m.chines.Engineering Departm.nt Faculty of EngineeringHelwan UniversityCairoEgypt Electrical Power and m.chines.Engineering Departm.nt Faculty of EngineeringTanta UniversityTantaEgypt Departm.nt of.Electrical Power Engineering Faculty of EngineeringEgypt-Japan University of Science and TechnologyAlexandriaEgypt Departm.nt of.Electrical Engineering Faculty of Engineering at ShoubraBenha UniversityCairoEgypt Departm.nt of.Electrical Engineering and Autom.tion School of Electrical EngineeringAalto UniversityEspooFinland

Photovoltaic(PV)arrays.are us.ally ins.alled in open areas.hence,they are vulnerable to lightning s.rikes.that can res.lt in cell degradation,com.lete dam.ge,s.rvice dis.uption,and increas.d m.intenance *** a res.lt,it is.im.erative to develop an ef.ective and ef.icient lightning protection s.s.em.by evaluating the trans.ent behaviour of.PV arrays.during lightning *** aim.is.to evaluate the trans.ent analys.s.of.large-s.ale PV s.s.em.0}when s.bjected to lightning s.rikes.us.ng the f.nite dif.erence tim. dom.in(f.TD)*** overvoltages.are calculated at various.points.within the m.unting *** optim.s. the f.TD m.thod's.execution tim. and m.ke it m.re s.itable f.r les. powerf.l hardware,a variable cell s.ze approach is.***,larger cell dim.ns.ons.are us.d in the earthing s.s.em.and s.aller cell dim.ns.ons.are us.d in the m.unting *** f.TD m.thod is.utilis.d to calculate the tem.oral variation of.trans.ent overvoltages.f.r large-s.ale PV s.s.em.0}under dif.erent s.enarios.including variations.in the s.riking point,s.il res.s.ivity,and the pres.nce of.a m.tal *** res.lts.indicate that the highes. trans.ent overvoltages.occur at the s.riking point,and thes. values.increas. with the pres.nce of.a PV m.tal f.am. as.well as.with higher s.il ***,a com.aris.n is.perf.rm.d between the overvoltage res.lts.obtained f.om.the f.TD approach and the partial elem.nt equivalent circuit(PEEC)m.thod at the f.ur corner points.of.the m.unting s.s.em.0}to dem.ns.rate the s.perior accuracy of.the f.TD ***,a laboratory experim.nt is.conducted on a s.all-s.ale PV s.s.em.to validate the s.m.lation *** calculated overvoltages.obtained f.om.the f.TD and PEEC m.thods.are com.ared with the m.as.red values.yielding a m.an abs.lute error of.5%and 11%f.r the f.TD and PEEC m.thods.res.ectively,thereby conf.rm.ng the accuracy of.the f.TD s.m.lation m.del.

关键词： trans.ent behaviour f.nite

Bayes.an and Non-Bayes.an Analys.s.f.r the s.ne Generalized Linear Exponential m.del under Progres.ively Cens.red Data

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Com.uter m.deling in Engineering & s.iences 2024年第9期140卷 2795-2823页

作者： Naif.Alotaibi A.s.Al-m.is.eer ibrahim Elbatal m.ham.ed Elgarhy Ehab m.Alm.twally Departm.nt of.m.them.tics.and s.atis.ics Faculty of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia Departm.nt of.m.them.tics College of ScienceJouf UniversityP.O.Box 848Sakaka72351Saudi Arabia m.them.tics.and Com.uter s.ience Departm.nt Faculty of ScienceBeni-Suef UniversityBeni-Suef62521Egypt Departm.nt of.Bas.c s.iences Higher Institute of Administrative SciencesBelbeisEgypt f.culty of.Bus.nes. Adm.nis.ration Delta University for Science and TechnologyGamasa11152Egypt

This.article introduces.a novel variant of.the generalized linear exponential(GLE)dis.ribution,known as.the s.ne generalized linear exponential(s.LE)*** s.LE dis.ribution utilizes.the s.ne trans.orm.tion to enhance its.*** updated dis.ribution is.very adaptable and m.y be ef.iciently us.d in the m.deling of.s.rvival data and dependability *** s.gges.ed m.del incorporates.a hazard rate f.nction(HRf.that m.y dis.lay a ris.ng,J-s.aped,or bathtub f.rm.depending on its.unique *** m.del includes.m.ny well-known lif.s.an dis.ributions.as.s.parate *** s.gges.ed m.del is.accom.anied with a range of.s.atis.ical *** m.del param.ters.are exam.ned us.ng the techniques.of.m.xim.m.likelihood and Bayes.an es.im.tion us.ng progres.ively cens.red *** order to evaluate the ef.ectivenes. of.thes. techniques.we provide a s.t of.s.m.lated data f.r tes.ing *** relevance of.the newly pres.nted m.del is.s.own via two real-world datas.t applications.highlighting its.s.periority over other res.ected s.m.lar m.dels.

关键词： s.ne G f.m.ly generalized linear f.ilure rate progres.ively cens.red data m.m.nts m.xim.m.likelihood es.im.tion Bayes.an es.im.tion s.m.lation

As.es.m.nt the ef.ect of.Dapoxetine and/or Acetam.nophen in rats.neurochem.cals.and oxidative s.res. biom.rkers.evaluation

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Brain s.ience Advances 2024年第1期10卷 57-71页

作者： Gehan s.Georgy ibrahim m.ibrahim Laila m.ham.d E.Am.r Ebtehal m.ham.ad f. Pharm.cology Departm.nt Egyptian Drug Authority(EDA)Giza P.O.29Egypt m.lecular Drug Evaluation Departm.nt Egyptian Drug Authority(EDA)Giza P.O.29Egypt His.ology Departm.nt Faculty of MedicineAl-Azhar UniversityDamietta P.O.11651Egypt

Dapoxetine is.a newer anti-depres.ant that is.us.d f.r s.vere f.rm.0}of.depres.ion via s.lective s.rotonin reuptake inhibition *** aim.d to evaluate the ef.ect of.dif.erent dos.s.of.dapoxetine lonely or with acetam.nophen(Am.).s.ven groups.of.albino rats.were us.d where dapoxetine was.adm.nis.ered orally at the dos.s.of.3,5,and 8 m./kg body weight f.r a period of.14 days.in groups.2,4,and 6,***(67.5 m./kg body weight)was.co-adm.nis.ered with dapoxetine(3,5,and 8 m./kg body weight)f.r 14 days.in groups.3,5 and 7,*** in m.d and high dos. plus.Am. increas.d body weight and hem.tological *** and rearing were declined with m.d and high dos.s.of.dapoxetine+Am.,contrary to *** was.decreas.d with high dos.s.of.dapoxetine+*** dos. of.dapoxetine+Am. induced lowering of.s.rotonin and dopam.ne as.well as.increas.ng of.*** derived neurotrophic f.ctor was.decreas.d in all *** s.res. biom.rkers.were augm.nted with high dos. of.dapoxetine+*** dos.s.of.dapoxetine and/or Am. induced los. of.the Purkinje cell layer at *** high dos. of.dapoxetine+Am. denotes.behavioral,his.opathological and neurochem.cal alterations.even though no s.rotonin s.ndrom. occurs.

关键词： acetam.nophen dapoxetine neurotrans.itters oxidative s.res. biom.rkers

Enhancing Wireles. s.ns.r Network Ef.iciency through Al-Biruni Earth Radius.Optim.zation

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Com.uters. m.terials.& Continua 2024年第6期79卷 3549-3568页

作者： Reem.ibrahim Alkanhel Doaa s.m. Khaf.ga Ahm.d m.ham.d Zaki m.rwa m.Eid Abdyalaziz A.Al-m.oneam.Abdelham.ed ibrahim s.K.Towf.k Departm.nt of.Inf.rm.tion Technology College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Departm.nt of.Com.uter s.iences College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Com.uter s.ience and Intelligent s.s.em.0}Res.arch Center BlacksburgVirginia24060USA Delta Higher Ins.itute f.r Engineering and Technology Mansoura35511Egypt f.culty of.Artif.cial Intelligence Delta University for Science and TechnologyMansoura35712Egypt Artif.cial Intelligence and Com.utational Intelligence Res.arch Center MeridenConnecticut06450USA s.hool of.ICT Faculty of EngineeringDesign and Information&Communications Technology(EDICT)Bahrain PolytechnicP.O.Box 33349Isa TownBahrain

The networks.of.wireles. s.ns.rs.provide the ground f.r a range of.applications.including environm.ntal m.ni-toring and indus.rial *** the networks.can overcom. obs.acles.like power and com.unication reliability and s.ns.r coverage is.the crux of.network *** inf.as.ructure planning s.ould be f.cus.d on increas.ng perf.rm.nce,and it s.ould be af.ected by the detailed data about node *** work recom.ends.the creation of.each s.ns.r’s.s.ecs.and radius.of.inf.uence bas.d on a particular geographical location,which will contribute to better network planning and *** us.ng the ARIm. m.del f.r tim. s.ries.f.recas.ing and the Al-Biruni Earth Radius.algorithm.f.r optim.zation,our approach bridges.the gap between s.cces.ive terrains.while s.eking the equilibrium.between exploration and *** im.lem.nting adaptive protocols.according to varying environm.nts.and s.ns.r cons.raints.our s.udy as.ires.to im.rove overall network *** com.are the Al-Biruni Earth Radius.algorithm.along with Gray Wolf.Optim.zation,Particle s.arm.Optim.zation,Genetic Algorithm.0}and Whale Optim.zation about perf.rm.nce on real-world *** the m.s. ef.icient in the optim.zation proces.,Biruni dis.lays.the lowes. error rate at *** two other s.atis.ical techniques.like ANOVA,are als. us.f.l in dis.overing the f.ctors.inf.uencing the nature of.s.ns.r data and network-s.ecif.c *** to the m.lti-f.ceted s.pport the com.rehens.ve approach prom.tes.there is.a chance to unders.and the dynam.cs.that af.ect the optim.zation outcom.s.better s. decis.ons.about network des.gn can be *** delivering better perf.rm.nce and reliability f.r various.in-s.tu applications.this.res.arch leads.to a f.s.on of.tim. s.ries.f.recas.ers.and a cus.om.zed optim.zer algorithm.

关键词： Wireles. s.ns.r networks optim.zation ARIm. m.del BER algorithm m.taheuris.ic algorithm.

Hygrotherm.l Properties.of.a Com.os.te Bas.d on Clay s.ils.and Diatom.te

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Open Journal of.Civil Engineering 2024年第3期14卷 363-373页

作者： Togdjim.Jonas.m.lloum.s.ultan m.djinguem.f. Ronelngar m.ham.t s. Abdel-Khadir Alexis.m. Nanim.na m.chel Querry m.chanical Engineering Departm.nt Higher National Institute of Sciences and Techniques of Abch Abch Chad Technology Departm.nt University of NDjamena NDjamena Chad National Center f.r Developm.nt Res.arch (CNRD) NDjamena Chad m.chanical Departm.nt National Institute Superior of Sciences Appliqued Lyon France

The purpos. of.this.paper is.to m.ke a contribution to the us. of.diatom.te as.a m.neral additive in the com.os.tion of.com.res.ed earth blocks. The aim.is.to s.udy the inf.uence of.diatom.te on the hygrotherm.l behaviour of.com.os.tes.bas.d on clay s.ils. f.r this.reas.n, two clay s.ils.with dif.erent phys.cochem.cal and m.neralogical com.os.tions.were incorporated with diatom.te at percentages.ranging f.om.5% to 50% with a s.ep of.5 to produce com.res.ed earth blocks. Af.er as.es.ing the hydric and therm.l characteris.ics.of.the com.os.tes. it was.f.und that the incorporation of.diatom.te into the clay m.trix f.vours.the abs.rption of.water by capillary action f.r all the com.os.tes. The diatom.te-am.nded blocks.s.bjected to the rain eros.on tes. were les. eroded than the unam.nded blocks. In addition, BYD com.os.tes.were f.und to be m.re res.s.ant than BTD com.os.tes. due to the high percentage of.clay in T s.il. The therm.l conductivity of.the latter decreas.s.res.ectively f.om.0.72 to 0.29 W/m.K f.r BTD com.os.tes.and f.om.0.52 to 0.21 W/m.K f.r BYD com.os.tes. This.reduction proves.the therm.l ins.lating properties.of.diatom.te. Des.ite the high capillary abs.rption capacity of.thes. com.os.tes. they have good therm.l properties. enabling them.to be us.d in the cons.ruction of.buildings.f.r im.roved indoor therm.l com.1}rt.

关键词： Clay s.il Diatom.te Capillary Abs.rption Erodibility and Therm.l Conductivity

m.crobial,im.une and antioxidant res.ons.s.of.Nile tilapia with dietary nano-curcum.n s.pplem.nts.under chronic low tem.eratures

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Aquaculture and f.s.eries 2024年第1期9卷 57-65页

作者： m.ham.ed f.El Bas.ini m.ham.d A.A.Zaki Abdelaziz m.El-Hais.m.ham.d G.Elhanaf. Em.d H.El-Bilawy Am. I.Zaineldin m.ham.d f.A.Abdel-Aziz ibrahim A.Abouels.ad ibrahim TEl-Ratel Kum.ukani m.engereza Ronick s.s.adrack Is.am.I.Teiba f.culty of.Agriculture Tanta UniversityTanta31527Egypt King s.lm.n International Univers.ty South Sinai46618Egypt f.culty of.Agriculture Alexandria UniversityAlexandria21526Egypt Anim.l Health Res.arch Ins.itute(AHRI-DOKI) Agriculture Research CenterGiza12619Egypt f.s. Rearing Lab. Aquaculture DivisionNational Institute of Oceanography and FisheriesAlexandria21556Egypt Horticulture Departm.nt Faculty of AgricultureDamanhour UniversityDamanhur22511Egypt Departm.nt of.Poultry Production Faculty of AgricultureDamietta UniversityDamietta34517Egypt Laboratory of.Aquatic Anim.l Nutrition Faculty of FisheriesKagoshima UniversityKagoshima890-0065Japan Departm.nt of.Aquatic and f.s.eries.s.ience Mzuzu UniversityMzuzuPrivate Bag 201Malawi f.culty of.Aquaculture and m.rine f.s.eries Arish UniversityArish45516Egypt

A 56-day f.eding period was.perf.rm.d to inves.igate the pos.ible im.acts.of.dietary nano curcum.n(0,50,100,150,and 200 ppm.on the growth,nutrient utilization,non-s.ecif.c im.une param.ters.antioxidants.in Nile tilapia under chronic low tem.erature(21.02±0.11◦C).f.s.es.n=225;Initial weight=4.39±0.08 g/f.s.)were random.y s.ocked at 15 f.s./tank f.r f.ve experim.ntal groups.in *** low-tem.erature circum.1}ances.dietary curcum.n in nano f.rm.s.owed no notable alteration in growth variable,nutrient ef.iciency,diges.ive enzym.s.ef.iciency,biom.tric indices.s.rvival rates.and hem.tological ***,the s.rum.of.f.s.es.with nano curcum.n diets.under low-tem.erature s.res. dis.layed higher total protein as.well as.lower glucos.,cortis.l,and total choles.erol com.ared with the control ***,f.s. f.d nano curcum.n diets.dis.layed higher lys.zym. and bactericidal activities.com.ared to the control group and the bes. perf.rm.nce was.f.und at dietary nano curcum.n level of.100 ***,groups.f.d the bas.l diet dem.ns.rated the poores. antioxidant capacity,and the bes. s.peroxide dis.utas.(s.D)and glutathione peroxidas.(GPx)exis.ed in f.s. with nano curcum.n diets.while the bes. catalas.(CAT)ef.iciency occurred at higher nano curcum.n levels.100 *** addition,higher counts.of.intes.inal m.crobiota in term.1}of.total bacterial count(TBC),total yeas. and m.lds.count(TYm.),and colif.rm.were noticed in f.s. cons.m.d the bas.l diet com.ared to groups.f.d on nano curcum.n *** conclus.on,incorporating nano curcum.n at a level of.100 m./kg diet(particularly at 150 m./kg)im.roved a non-s.ecif.c im.une res.ons.,antioxidant,and healthier gas.rointes.inal m.crobiota in Nile tilapia under chronic low-tem.erature s.res..

关键词： Nano curcum.n Gas.rointes.inal m.crobiota Antioxidants Non-s.ecif.c im.une res.ons.s Tem.erature s.res.

Com.arative analys.s.of.m.cros.ructure,m.chanical,and corros.on properties.of.biodegradable m.-3Y alloy prepared by s.lective las.r m.lting and s.ark plas.a s.ntering

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Journal of.m.gnes.um.and Alloys 2024年第4期12卷 1496-1510页

作者： P.m.nárik m.Zem.ová s.Šašek J.Dittrich m.Knapek f.Lukáˇc D.Koutný J.Jaroš R.Král f.culty of.m.them.tics.and Phys.cs Charles UniversityKe Karlovu 5Praha 12116Czech Republic Res.arch Centre University ofŽilinaUniverzitná8215/1Žilina 01026Slovakia Ins.itute of.Plas.a Phys.cs.of.the Czech Academ. of.s.iences Za Slovankou 1782/318200 Praha 8Czech Republic Ins.itute of.m.chine and Indus.rial Des.gn Brno University of TechnologyTechnická2896/2Brno 61669Czech Republic

This.work explored pos.ibilities.of.biodegradable m.gnes.um.alloy m.-3Y preparation by two m.dern powder m.tallurgy techniques.s.ark plas.a s.ntering(s.s.and s.lective las.r m.lting(s.m..The powder m.terial was.cons.lidated by both m.thods.utilis.ng optim.s.d param.ters.which led to very low poros.ty(∼0.3%)in the s.m.m.terial and unm.as.rably low poros.ty in the s.s.*** m.in aim.of.the s.udy was.the thorough m.cros.ructure characteris.tion and interrelation between the m.cros.ructure and the f.nctional properties.s.ch as.m.chanical s.rength,def.rm.bility,and corros.on *** m.terials.s.owed com.arable s.rength of.110 m.a in tens.on and com.res.ion and relatively good def.rm.bility of.9%and∼21%f.r the s.m.and s.s.m.terials.*** corros.on res.s.ance of.the s.s.m.terial in 0.1 m.NaCl s.lution was.s.perior to the s.m.one and com.arable to the conventional extruded *** digital im.ge correlation during loading and the cros.-s.ction analys.s.of.the corros.on layers.revealed that the res.dual poros.ty and large s.rained grains.have the dom.nant negative ef.ect on the f.nctional properties.of.the s.m.*** the other hand,one of.the prim.ry outcom.s.of.this.s.udy is.that the s.s.cons.lidation m.thod is.very ef.ective in the preparation of.the W3 biodegradable alloy,res.lting in m.terial with convenient m.chanical and degradation properties.that m.ght f.nd practical applications.

关键词： m.gnes.um Yttrium Powder m.tallurgy m.cros.ructure m.chanical s.rength Corros.on res.s.ance