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Under.tanding the cor.osion and bio-cor.osion behaviour.of Magnesium composites – a cr.tical r.view

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Jour.al of Magnesium and Alloys 2024年第3期12卷 890-939页

作者： Pr.thivir.jan Sek.r.S.k.Panigr.hi Depar.ment of Mechanical Engineer.ng Indian Institute of Technology MadrasChennai600036India Applied Magnesium r.sear.h Center Center of Excellence in Materials and Manufacturing for Futuristic MobilityIndian Institute of Technology MadrasChennai600036India

r.alising the potential of Magnesium(Mg),sever.l globally leading ventur.s have invested in the Mg industr.,but their.r.latively poor.cor.osion r.sistance is a never.ending saga till *** cor.osion and bio-cor.osion behaviour.of Mg has gained r.sear.h attention and still r.mains a hot topic in the application of automobile,aer.space and biomedical *** intr.nsic high electr.chemical natur. of Mg limits their.utilization in diver.e *** scenar.o has pr.mpted the development of Mg composites with an aim to achieve super.or.cor.osion and bio-cor.osion *** pr.sent r.view enlightens the influence of gr.in size(GS),secondar. phase,textur.,type of matr.x and r.infor.ement on the cor.osion and bio-cor.osion behaviour.of Mg ***,the cor.osion and bio-cor.osion behaviour.of Mg composites manufactur.d by pr.mar. and secondar. pr.cessing r.utes ar. ***,the compr.hensive cor.osion and bio-cor.osion mechanisms of these Mg composites ar. ***,the individual r.le of GS,textur. and cor.osive medium on cor.osion and bio-cor.osion behaviour.of Mg composites ar. clar.fied and *** challenges encounter.d,unanswer.d issues in this field ar. explained in detail and accor.ingly the scope for.futur. r.sear.h is *** r.view is pr.sented fr.m basic concr.te back.r.und to advanced cor.osion mechanisms with an aim of cr.ating inter.st among the r.ader. lik. students,r.sear.her. and industr. exper.s fr.m var.ous r.sear.h ***,the cor.osion and bio-cor.osion behaviour.of Mg composites ar. cr.tically r.viewed for.the fir.t time to:(i)contr.bute to the body of k.owledge,(ii)foster.r.sear.h and development,(iii)mak. br.ak.hr.ugh,and(iv)cr.ate life changing innovations in the field of Mg composite cor.osion.

关键词： Cor.osion Bio cor.osion Magnesium alloys Magnesium composites Magnesium implants.

Adaptations of phytoplank.on in the Indian Ocean sector.of the Souther. Ocean dur.ng austr.l summer.of 1998-2014

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Fr.ntier. of Ear.h Science 2015年第4期9卷 742-752页

作者： r. k. MISHr. r. k. NAIk.N. ANIL k.MAr ESSO-National Centr. for.Antar.tic and Ocean r.sear.h Ministry of Earth Sciences (MoES) Vasco-da-Gama Goa India

This study investigates the effects of light and temper.tur. on the sur.ace water.diatoms and chlor.- phytes, phytoplank.on in the Indian Ocean sector.of the Souther. Ocean （SO） dur.ng the austr.l summer.of 1998- 2014. Significant longitudinal var.ations in hydr.gr.phic and biological par.meter. wer. obser.ed at the Sub tr.pical fr.nt （STF）, Sub Antar.tic fr.nt （SAF） and Polar.fr.nt （PF） along 56°E-58°E. The concentr.tions of total sur.ace chlor.phyll a （Chl a）, diatoms, and chlor.phytes measur.d by the National Aer.nautics Space Agency （NASA） estimated by the Sea-Viewing Wide Field-of- View Sensor. （SeaWiFS）, the Moder.te r.solution Imaging Spectr. r.diometer.（MODIS）, and the NASA Ocean Biological Model （NOBM） wer. used in the study. Var.ations in the concentr.tion of total Chl a was r.mar.able amongst the fr.nts dur.ng the study per.od. The contr.bution of diatoms to the total concentr.tion of sur.ace Chl a incr.ased towar.s south fr.m the STF to the PF while it decr.ased in the case of chlor.phytes. The maximum photosynthetically active r.diation （PAr. was obser.ed at the STF and it pr.gr.ssively decr.ased to the PF thr.ugh the SAF. At the PF r.gion the contr.bution of diatoms to the total Chl a biomass was ≥80%. On the other.hand, the chlor.phytes showed a contr.r. distr.bution patter. with ≥ 70% of the total Chl a biomass r.cor.ed at the STF which gr.dually decr.ased towar.s the PF, mainly attr.buted to the temper.te adaptation. This clear.y r.veals that the tr.nd of diatoms incr.ased at the STF and decr.ased at the SAF and the PF. Fur.her. the tr.nd of chlor.phytes was incr.ased at the STF, SAF and PF with a shift in the community in the fr.ntal system of the Indian Ocean sector.of the SO.

关键词： chlor.phyll a diatoms chlor.phytes SST,PAr Souther. Ocean

Long Ter. X-r.y Spectr.l Var.ations of the Seyfer.-1 Galaxy Mr. 279

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r.sear.h in Astr.nomy and Astr.physics 2024年第6期24卷 307-314页

作者： k.Ak.ila r.njeev Misr. Savithr. H.Ezhik.de k.Jeena Depar.ment of Physics Providence Women’s CollegeUniversity of CalicutKerala 673009India Inter.Univer.ity Centr. for.Astr.nomy and Astr.physics(IUCAA) PB No.4GaneshkhindPune 411007India Depar.ment of Physics and Electr.nics CHRIST(Deemed to be University)Hosur Main RoadBangalore 560029India

We pr.sent the r.sults fr.m a long ter. X-r.y analysis of Mr. 279 dur.ng the per.od 2018–*** use data fr.m multiple missions–Astr.Sat,NuSTAr.and XMM-Newton,for.the *** X-r.y spectr.m can be modeled as a double Comptonization along with the pr.sence of neutr.l Fe k.line emission,at all *** deter.ined the sour.e’s X-r.y flux and luminosity at these differ.nt *** find significant var.ations in the sour.e’s flux *** also investigate the var.ations in the sour.e’s spectr.l components dur.ng the obser.ation *** find that the photon index and hence the spectr.l shape follow the var.ations only over.longer.time *** pr.be the cor.elations between fluxes of differ.nt bands and their.photon indices,and found no significant cor.elations between the par.meter..

关键词： galaxies:Seyfer. galaxies:individual(Mr. 335) X-r.ys:galaxies

Velocity Cur.e Analysis of Spectr.scopic Binar. Star. AI Phe,GM Dr.,HD 93917 and V502 Oph by Nonlinear.r.gr.ssion

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Chinese Jour.al of Astr.nomy and Astr.physics 2007年第4期7卷 558-564页

作者： k. k.r.mi r. Mohebi Depar.ment of Physics University of KurdistanPasdaran St.P. O. Box 66177-15175Sanandaj Iran Research Institute for Astronomy & Astrophysics of Maragha (RIAAM)P. O. Box 55134-441MaraghaIran Institute for Advanced Studies in Basic Sciences(IASBS)Gava ZangP. O. Box 45195-1159Zanjan Iran Institute for.Advanced Studies in Basic Sciences(IASBS) Gava ZangP. O. Box 45195-1159Zanjan Iran

We intr.duce a new method to der.ve the or.ital par.meter. of spectr.scopic binar. star. by nonlinear.least squar.s of （o - c）. Using the measur.d r.dial velocity data of the four.double lined spectr.scopic binar. systems, AI Phe, GM Dr., HD 93917 and V502 Oph, we der.ved both the or.ital and combined spectr.scopic elements of these systems. Our.numer.cal r.sults ar. in good agr.ement with the those obtained using the method of Lehmann-Filhés.

关键词： star.: binar.es: eclipsing - star.: binar.es: spectr.scopic

Applicability limits of the DAX test in plastic bonded explosives

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Defence Technology（防务技术） 2024年第6期36卷 64-70页

作者： Mar.in k.nzel Jindr.ch k.cer. Jir. Pachman OZM r.sear.h Bliznovice 32Hrochuv Tynec 53862Czech Republic Institute of Ener.etic Mater.als Faculty of Chemical TechnologyUniversity of PardubiceStudentska 95Pardubice 53210Czech Republic

The Disc Acceler.tion e Xper.ment(DAX)is one of the most r.cent exper.mental methods of per.or.ance char.cter.zation of new ener.etic mater.als.A cylindr.cal explosive char.e acceler.tes a thin metallic disc and its velocity is measur.d continuously using photonic Doppler.*** detonation velocity is measur.d *** DAX test can be used to obtain the Chapman-Jouguet(CJ)detonation pr.ssur. and to descr.be detonation pr.ducts expansion using r.duced amount of explosive.A ser.es of DAX tests was per.or.ed at var.ous char.e diameter. and disc thick.esses with Semtex 1 A plastic bonded explosive and sensitized *** DAX-lik. evaluation was also applied to pr.viously measur.d data of Semtex 1A and A-IX-1 *** optimum disc thick.ess is deter.ined by the disc to explosive mass r.tio of *** r.peatability of the Semtex 1 A detonation pr.ssur. r.sults is about four.times lower.compar.d to the pr.ssed and liquid explosives.

关键词： Flyer.plate Detonation pr.ssur. Photonic Doppler.velocimetr. Semtex

Effect of or.anic component(tar.r.te) addition on cer.um nitr.te's ability to inhibit cor.osion of mild steel in NaCl solution

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Jour.al of r.r. Ear.hs 2024年第10期42卷 1995-2002页

作者： Minak.hi k.undal Chhaya Shar.a A.k.Singh Depar.ment of Applied Science and Engineer.ng Indian Institute of Technology RoorkeeSaharanpur Campus Depar.ment of Pulp and Paper.Technology Indian Institute of Technology r.or.ee Saharanpur Campus

Cer.um tar.r.te（CeTar.,pr.duced in this study by pr.cipitating cer.um nitr.te with potassium sodium tar.r.te（k.aTar.,was examined as a cor.osion *** loss tests show inhibition efficiency of 71.7% with Ce（NO3）3and 88.7% with CeTar.inhibitor.for.one-month exposur. to mild steel in 7 g/L NaCl *** inhibition efficiency dr.ps to 28.6% with the fo r.er.and r.mains ar.und 8 7% with the latter.inhibitor.after.six months of *** r.sults fr.m electr.chemical testing indicate that the inhibition efficiency decr.ases by adding cer.um ***,the cer.um tar.r.te inhibitor.demonstr.tes a near.y constant inhibition efficiency for.up to 30 d,i.e.,≈90%.Electr.chemical impedance spectr.scopy（EIS） per.or.ed in these cases shows the following r.sults:（ⅰ） with cer.um nitr.te,a film of ir.n and cer.um oxide,which on pr.longed exposur. diminishes,and（ⅱ） with cer.um tar.r.te,the for.ation of a bimetallic film（Fe-tar.r.te-Ce） and a mixtur. of cer.um hydr.xide and ir. n oxide that pr.tects steel for.a longer.*** infer.nces ar. based on the analyses of scanning electr.n micr.scopy/ener.ydisper.ive X-r.y analysis（SEM/EDAX）,X-r.y diffr.ction（Xr.）,Four.er.tr.nsfor. infr.r.d spectr.scopy（FTIr.,X-r.y photoelectr.n（XPS）,and r.man spectr.scopy r.sults.

关键词： Cer.um nitr.te Cer.um tar.r.te Cor.osion inhibition Inhibitor.film char.cter.zation Mild steel r.r. ear.hs

Gr.phene-calcium car.onate coating to impr.ve the degr.dation r.sistance and mechanical integr.ty of a biodegr.dable implant

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Jour.al of Magnesium and Alloys 2024年第1期12卷 394-404页

作者： Lok.sh Choudhar. Par.ma Chak.0}bor.y Baner.ee r.k.Singh r.man Der.ek.E.Lobo Chr.stopher.D.Easton Mainak.Majumder.Fr.nk.Witte Jör. F.Löffler Depar.ment of Mechanical and Aer.space Engineer.ng Monash UniversityClayton CampusMelbourneVIC 3800Australia Depar.ment of Chemical and Biological Engineer.ng Monash UniversityClayton CampusMelbourneVIC 3800Australia Nanoscale Science and Engineer.ng Labor.tor.(NSEL) Bldg 37Monash UniversityClayton CampusMelbourneVIC 3800Australia CSIr. Mater.als Science and Engineer.ng Bayview AvenueClaytonVIC 3168Australia Julius Wolff Institute and Ber.in Br.ndenbur. Center.for.r.gener.tive Ther.pies Charité–Universitätsmedizin BerlinAugustenburger Platz 113353 BerlinGermany Labor.tor. of Metal Physics and Technology Department of MaterialsETH Zurich8093 ZurichSwitzerland

Biodegr.dable implants ar. cr.tical for.r.gener.tive or.hopaedic pr.cedur.s,but they may suffer.fr.m too fast cor.osion in human-body *** necessitates the synthesis of a suitable coating that may impr.ve the cor.osion r.sistance of these implants without compr.mising their.mechanical *** this study,an AZ91 magnesium alloy,as a r.pr.sentative for.a biodegr.dable Mg implant mater.al,was modified with a thin r.duced gr.phene oxide(r.O)-calcium car.onate(CaCO_(3))composite *** analytical and in-vitr. electr.chemical char.cter.zation r.veals that this coating significantly impr.ves the cor.osion r.sistance and mechanical integr.ty,and thus has the potential to gr.atly extend the r.lated application field.

关键词： Gr.phene coating Biodegr.dable implant Hydr.xyapatite Cor.osion Magnesium alloy

Hybr.d Pr.ir.e Dog and Beluga Whale Optimization Algor.thm for.Multi-Objective Load Balanced-Task.Scheduling in Cloud Computing Envir.nments

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China Communications 2024年第7期21卷 307-324页

作者： k.r.mya Senthilselvi Ayothi Depar.ment of Computer.Science and Engineer.ng SRM Institute of Science and TechnologyRamapuramChennaiTamil Nadu 600089India

The cloud computing technology is utilized for.achieving r.sour.e utilization of r.motebased vir.ual computer.to facilitate the consumer. with r.pid and accur.te massive data *** utilizes on-demand r.sour.e pr.visioning,but the necessitated constr.ints of r.pid tur.ar.und time,minimal execution cost,high r.te of r.sour.e utilization and limited mak.span tr.nsfor.s the Load Balancing(LB)pr.cess-based Task.Scheduling(TS)pr.blem into an NP-har. optimization *** this paper.Hybr.d Pr.ir.e Dog and Beluga Whale Optimization Algor.thm(HPDBWOA)is pr.pounded for.pr.cise mapping of task. to vir.ual machines with the due objective of addr.ssing the dynamic natur. of cloud *** capability of HPDBWOA helps in decr.asing the SLA violations and Mak.span with optimal r.sour.e *** is modelled as a scheduling str.tegy which utilizes the mer.ts of PDOA and BWOA for.attaining r.active decisions mak.ng with r.spect to the pr.cess of assigning the task. to vir.ual r.sour.es by consider.ng their.pr.or.ties into *** addr.sses the pr.blem of pr.-conver.ence with wellbalanced explor.tion and exploitation to attain necessitated Quality of Ser.ice(QoS)for.minimizing the waiting time incur.ed dur.ng TS *** fur.her.balanced explor.tion and exploitation r.tes for.r.ducing the mak.span dur.ng the task.allocation with complete awar.ness of VM *** r.sults of the pr.posed HPDBWOA confir.ed minimized ener.y utilization of 32.18% and r.duced cost of 28.94% better.than appr.aches used for.*** statistical investigation of the pr.posed HPDBWOA conducted using ANOVA confir.ed its efficacy over.the benchmar.ed systems in ter.s of thr.ughput,system,and r.sponse time.

关键词： Beluga Whale Optimization Algor.thm(BWOA) cloud computing Impr.ved Hopcr.ft-k.r. algor.thm Infr.str.ctur. as a Ser.ice(IaaS) Pr.ir.e Dog Optimization Algor.thm(PDOA) Vir.ual Machine(VM)

A new r.ute to weak.for.e sensing beyond SQL:Squeezed magnons in cavity magnomechanics

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Science China(Physics,Mechanics & Astr.nomy) 2024年第10期67卷 166-167页

作者： S.k.Özdemir Depar.ment of Engineer.ng Science and Mechanics and Materials Research Institute(MRI)The Pennsylvania State UniversityUniversity ParkPA 16802USA

Quantum mechanics imposes limits on measur.ment accur.cy thr.ugh quantum noise which typically has two components:Fir.t is the shot noise or.ginating fr.m vacuum fluctuations and r.fer.ed to as the impr.cision *** is ... 详细信息

关键词： quantum typically vacuum