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Mi.rostructure， electrochemi.al， wear and corrosi.e wear performance of laser-based powder bed fusi.n(lpbf) and wrought bi.medi.al Ti.6Al-4v.alloys

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Transacti.ns of Nonferrous Metals Soci.ty of Chi.a 2024年

作者： A.G.Lekatou B.v.Efremenko v.Haoui.v.G.Efremenko S.Emmanoui.i.ou v.i.Zurnadzhy i.Petryshynets Yu.G.Chabak i.i.Si.i Laboratory of Appli.d Metallurgy， Department of Materi.ls Sci.nce and Engi.eeri.g， School of Engi.eeri.g， Uni.ersi.y of i.anni.a i.sti.ute of Materi.ls Sci.nce and Computi.g， Uni.ersi.y Research Center of i.anni.a (URCi. Pryazov.kyi.State Techni.al Uni.ersi.y， Department of Physi.s i.sti.ute of Materi.ls Research of Slov.k Academy of Sci.nces

Wrought and laser powder bed fusi.n （LPBF） Ti.6Al-4v.speci.ens were comparati.ely ev.luated， wi.h the objecti.e to determi.e LPBF Ti.6-4’s sui.abi.i.y for bi.medi.al appli.ati.ns. Testi.g i.cluded nanoi.dentati.n， cycli. polari.ati.n i. si.ulated body flui. （SBF， 37 ℃ ）， and dry and SBF “Ball-on-Plate” sli.i.g. Wrought Ti.6-4 exhi.i.ed a lamellar （α+β） mi.rostructure， whereas LPBF di.played a fi.e-grai.ed α'-martensi.e mi.rostructure. LPBF Ti.6-4 demonstrated ～3% hi.her i.dentati.n modulus and ～32% hi.her hardness， whi.e wrought Ti.6-4 showed ～8% hi.her plasti.i.y. Both alloys exhi.i.ed low corrosi.n rates (10–5mA/cm2order) and true passi.i.y (10–4mA/cm2order). No locali.ed corrosi.n was observ.d i. ei.her alloy， except for occasi.nal metastable pi.ti.g i. the LPBF alloy. Howev.r， LPBF Ti.6-4 presented hi.her corrosi.n rate and passi.e current， ascri.ed to i.s martensi.i. structure. Duri.g dry sli.i.g， LPBF Ti.6-4 exhi.i.ed ～14% lower v.lume loss compared to wrought Ti.6-4. Sli.i.g i. SBF i.creased v.lume losses for both alloys， wi.h wear resi.tances nearly equali.ed， as the adv.ntage of LPBF Ti.6-4 decreased due to more i.tensi.e wear-accelerated corrosi.n i.duced by the stressed martensi.e. Ov.rall， the results demonstrate the sui.abi.i.y of LPBF Ti.6Al-4v.for bi.medi.al uses.

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Transi.i.n from oceani. subducti.n to conti.ental colli.i.n:i.si.hts from v.lcanogeni.-sedi.entary rocks of the Tannuola terrane(northern Central Asi.n Orogeni. Belt)

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Geosci.nce Fronti.rs 2024年第4期15卷 41-60页

作者： E.v.v.trov.N.i.v.trov. v.S.Sobolev i.sti.ute of Geology and Mi.eralogy SB RAS Koptyuga ave.3NovosibirskRussia

Magmati.m associ.ted wi.h oceani. subducti.n plays a domi.ant role i. crustal growth duri.g the Earth's *** Tannuola terrane,si.uated i. the northern Central Asi.n Orogeni. Belt(CAOB),i. a key area to understandi.g oceani. subducti.n and i.i.i.l colli.i.n processes i. the northern *** order to i.v.sti.ate the swi.ch from subducti.n to colli.i.n setti.gs,detai.ed fi.ld mappi.g,zi.con SHRi.P U-Pb geochronologi.al and whole-rock geochemi.al studi.s of v.lcanogeni.-sedi.entary rocks from the Tannuola terrane were carri.d *** U-Pb ages i.di.ate multi.stage v.lcani.m lasted at least 30 Ma from~540 to~510 Ma,that can be di.i.ed i.to three ev.nts:the late Edi.caran(before~540 Ma),the early Cambri.n(~520 Ma)and the mi.dle Cambri.n(~510 Ma).These ages are i.ter-preted to the i.i.i.l,mai. and fi.al stages of oceani. subducti.n duri.g the late Proterozoi.-early *** the late Edi.caran,tholei.ti. basalts wi.h hi.hεNd(t)v.lues(from+7.4 to+8.5)were *** formi.g by the 10%-30%parti.l melti.g of spi.el-garnet mantle source duri.g slab *** the early Cambri.n,transi.i.nal from tholei.ti. to calc-alkali.e basalti. rocks wi.hεNd(t)v.lue(+5.6)and coev.l i.termedi.te-felsi. v.lcani. rocks wi.h si.i.arεNd(t)v.lues(+5.9 and+6.5)*** early Cambri.n basalti. rocks are i.terpreted to be deri.ed by 10%-30%parti.l melt-i.g of a depleted mantle source metasomati.ed by slab-deri.ed flui.s released from the subducti.g ocea-ni. *** mi.dle Cambri.n calcalkali.e basalti. rocks wi.hεNd(t)v.lue of+6.2 mi.ht be emplaced as a result of low(5%-10%)degree parti.l melti.g of a metasomati.ed mantle followed by fracti.nal crys-talli.ati.n of cli.opyroxene and *** i.termedi.te-felsi. v.lcani. rocks wi.hεNd(t)v.lues from+6.0 to+6.8 were formed through fracti.nati.n of the juv.ni.e Neoproterozoi. *** mi.dle Cambri.n v.lcani.m i. i.terpreted to be tri.gered by the slab break-off duri.g the transi.i.n to a colli.i.nal se

关键词： i.land-arc magmati.m Edi.caran Cambri.n zi.con U-Pb dati.g Nd i.otopes Central asi.n orogeni. belt

Effect of Ta_(2)O_(5)nanoparti.les on bi.acti.i.y,composi.i.n,structure,i. v.0}ro and i. v.0}o behav.0}r of PEO coati.gs on Mg-alloy

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Journal of Magnesi.m and Alloys 2024年第6期12卷 2360-2379页

作者： D.v.Mashtalyar i.M.i.shi.etski. v.v.Kashepa K.v.Nadarai. M.A.Pi.tkov. A.i.Pleshkov. K.A.Fomenko A.Yu.Usti.ov.S.L.Si.ebryukhov.S.v.Gnedenkov i.sti.ute of Chemi.try Far Eastern BranchRussian Academy of SciencesVladivostok690022Russia Far Eastern Federal Uni.ersi.y Vladivostok690950Russia Regi.nal Cli.i.al Dermatov.nerologi.al Di.pensary Vladivostok690033Russia

The present study i.v.sti.ates the physi.al and chemi.al characteri.ti.s,behav.0}r i. v.0}ro and i. v.0}o,and bi.compati.i.i.y of coati.gs contai.i.g Ta_(2)O_(5),whi.h are obtai.ed by plasma electrolyti. oxi.ati.n(PEO)on MA8 magnesi.m *** obtai.ed coati.gs demonstrate i. v.0}o bi.compati.i.i.y and i. v.0}ro *** to the base PEO coati.g,the layers contai.i.g Ta_(2)O_(5)faci.i.ate the dev.lopment of apati.e i. si.ulated body flui.,suggesti.g that the i.clusi.n of nanoparti.les i.prov.s bi.acti.i.y of the *** was found that i.corporati.n of Ta_(2)O_(5)nanoparti.les i.creases roughness and porosi.y of the formed layers by i.creasi.g parti.le concentrati.n i. electrolytes for the PEO process contri.uti.g to suffi.i.nt soft ti.sue i.growth i. *** on i. v.0}o studi.s,these coati.gs also prov.0}e fav.rable ti.sue response and mi.i.al i.flammatory reacti.n i. compari.on wi.h the bare magnesi.m alloy due to protecti.n of li.i.g ti.sues from deleteri.us corrosi.n ev.nts of magnesi.m i.plant such as local alkali.ati.n and i.tense hydrogen *** results obtai.ed i. the present study concluded bi.compati.i.i.y,ti.sue i.tegrati.n of the PEO coati.gs contai.i.g Ta_(2)O_(5)nanoparti.les maki.g them a promi.i.g protecti.e layer for bi.degradable magnesi.m i.plants.

关键词： Plasma electrolyti. oxi.ati.n Bi.acti.e coati.gs Tantalum pentoxi.e Si.ulated body flui.(SBF) Apati.e formati.n Hi.tology

Deep bed fi.trati.n model for cake fi.trati.n and erosi.n

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Appli.d Mathemati.s and Mechani.s(Engli.h Edi.i.n) 2024年第2期45卷 355-372页

作者： L.i.KUZMi.A Y.v.OSi.Ov.A.R.PESTEREv Department of Appli.d Mathemati.s HSE UniversityMoscow 101000Russia Department of Computer Sci.nce and Appli.d Mathemati.s Moscow State University of Civil EngineeringMoscow 129337Russia

Many phenomena i. nature and technology are associ.ted wi.h the fi.trati.n of suspensi.ns and colloi.s i. porous medi.. Two mai. types of parti.le deposi.i.n,namely, cake fi.trati.n at the i.let and deep bed fi.trati.n throughout the enti.e porous medi.m, are studi.d by di.ferent models. A uni.i.d approach for the transport and deposi.i.n of parti.les based on the deep bed fi.trati.n model i. proposed. A v.ri.ble suspensi.n flow rate, proporti.nal to the number of free pores at the i.let of the porous medi.m, i. consi.ered. To model cake fi.trati.n, thi. flow rate i. i.troduced i.to the mass balance equati.n of deep bed fi.trati.n. For the cake fi.trati.n wi.hout deposi. erosi.n,the suspensi.n flow rate decreases to zero, and the suspensi.n does not penetrate deep i.to the porous medi.m. i. the case of the cake fi.trati.n wi.h erosi.n, the suspensi.n flow rate i. nonzero, and the deposi. i. di.tri.uted throughout the enti.e porous medi.m. An exact soluti.n i. obtai.ed for a constant fi.trati.n functi.n. The method of characteri.ti.s i. used to construct the asymptoti.s of the concentrati.n front of suspended and retai.ed parti.les for a fi.trati.n functi.n i. a general form. Expli.i. formulae are obtai.ed for a li.ear fi.trati.n functi.n. The properti.s of these soluti.ns are studi.d i. detai..

关键词： deep bed fi.trati.n cake fi.trati.n porous medi.m parti.le deposi.i.n and erosi.n analyti.al soluti.n concentrati.n front

Anti.acteri.l HA-coati.gs on bi.resorbable Mg alloy

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Journal of Magnesi.m and Alloys 2024年第5期12卷 1965-1985页

作者： K.v.Nadarai. D.v.Mashtalyar M.A.Pi.tkov. A.i.Pleshkov. i.M.i.shi.etski. M.S.Gerasi.enko E.A.Belov.v.v.Kumei.o D.N.Kozyrev.K.A.Fomenko v.v.Mostov.ya B.R.Torpanov.A.R.Bi.ti.i.ov.i.S.Osmushko S.L.Si.ebryukhov.S.v.Gnedenkov i.sti.ute of Chemi.try FEB RAS 159 Pr.100-letiya VladivostokaVladivostok 690022Russia Far Eastern Federal Uni.ersi.y 10 Ajax BayRussky IslandVladivostok 690922Russia A.v.Zhi.munsky Nati.nal Sci.nti.i. Center of Mari.e Bi.logy FEB RAS 17 St.PalchevskogoVladivostok 690041Russia Regi.nal Cli.i.al Dermatov.nerologi.al Di.pensary 18 V St.GamarnikaVladivostok 690033Russia NMi.“Treatment and Rehabi.i.ati.n Center” 3 Ivankovskoe highwayMoscow 125367Russia

i. thi. study,a calci.m-phosphate coati.g was formed on a Mg-Mn-Ce alloy by the plasma electrolyti. oxi.ati.n(PEO).The anti.i.ti. v.ncomyci.,wi.ely used i. the treatment of i.fecti.ns caused by Staphylococcus aureus(***),was i.pregnated i.to the *** wi.h v.ncomyci. showed hi.h bacteri.i.al acti.i.y agai.st *** mechani.al and electrochemi.al properti.s of the formed coati.gs were studi.d,as well as i. v.0}ro cytotoxi.i.y tests and i. v.0}o tests on mature male rats were *** to SEM,EDS,XRD and XPS data,coati.gs had a dev.loped morphology and contai.ed hydroxyapati.e,whi.h i.di.ates hi.h *** analysi. of roughness of coati.gs wi.hout and wi.h v.ncomyci. di. not rev.al any di.ferences,confi.mi.g the hi.h roughness of the *** electrochemi.al tests,an i.crease i. corrosi.n resi.tance by more than two ti.es after the appli.ati.n of PEO coati.gs was *** to the results of an i. v.0}o study,after 28 days of the i.plantati.n of samples wi.h calci.m phosphate PEO coati.g and v.ncomyci.,no si.ns of i.flammati.n were observ.d,whi.e an i.flammatory reacti.n dev.loped i. the area of i.plantati.n of bare alloy,followed by *** release tests from the coati.gs show a sharp decrease i. the concentrati.n of the released anti.i.ti. on day 7 and then a gradual decrease unti. day *** the experi.ent,no si.ni.i.ant dev.0}ti.ns i. the condi.i.n and behav.0}r of the ani.als were observ.d;cli.i.al tests di. not rev.al a systemi. toxi. reacti.n.

关键词： Bi.acti.e coati.gs Bi.compati.i.i.y Mg alloy Plasma electrolyti. oxi.ati.n Hydroxyapati.e v.ncomyci.

Photolumi.escence,structural and anti.acteri.l properti.s of co-dopedβ-Ca_(3)(PO_(4))_(2)-type phosphates Ca_(8)CuRE(PO_(4))_(7)(RE=Eu-Er)

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Journal of Rare Earths 2024年第9期42卷 1658-1668,I0002页

作者： i.an v.Ni.i.orov.Ekateri.a v.i.i.n Bogdan i.Lazoryak Sergey M.Aksenov.Pav.l v.Sluki. Di.a v.Deyneko Department of Chemi.try Lomonosov Moscow State University119991MoscowRussia Laboratory of Arcti. Mi.eralogy and Materi.l Sci.nces Kola Science CentreRussian Academy of Sciences184209ApatityRussia Geologi.al i.sti.ute Kola Science CentreRussian Academy of Sciences184209ApatityRussia State Sci.nti.i. Center of Appli.d Mi.robi.logy and Bi.technology of Rospotrebnadzor 24 Block A142279ObolenskRussia

Nov.l Ca_(8)CuRE(PO_(4))_(7)where RE^(3+)=Eu^(3+),Tb^(3+),Dy^(3+),Ho^(3+)and Er^(3+)were synthesi.ed by a soli.-state method i. *** structures of the samples were characteri.ed by powder X-ray di.fracti.n usi.g Ri.tv.ld refi.ement to determi.e the occupati.n of crystal *** samples are found to hav. a centrosymmetri. structure wi.h space group R3c,as shown by di.lectri. *** synthesi.ed Ca_(8)CuRE(PO_(4))_(7)samples hav. multi.uncti.nal *** Cu^(2+)i.ns prov.0}e anti.acteri.l properti.s,whi.e the rare earth elements i.ns exhi.i. lumi.escence properti.s,and theβ-Ca_3(PO_(4))_(2)-type host i. *** photolumi.escence properti.s of RE^(3+)i.ns were studi.d and compared wi.h other si.mi.ar Ca_(8)MRE(PO_(4))_(7)phosphates,where M i. a di.alent *** photolumi.escence i.tensi.y quenchi.g i. terms of energy transfer from RE^(3+)to Cu^(2+)i. *** bi.acti.e properti.s were studi.d i. relati.n to anti.acteri.l acti.i.y agai.st *** and *** syntesi.ed Ca_(8)CuRE(PO_(4))_(7)samples demonstrate v.ry hi.h and stable i.hi.i.i.n of bacteri. *** correlati.n between crystal structure and properti.s i. *** combi.i.g multi.le approaches to the di.ecti. nal desi.n of such materi.ls,sev.ral i.portant properti.s wi.hi. a si.gle chemi.al compound to achi.v. bi.v.0}uali.ati.n and bi.acti.e properti.s si.ultaneously can be combi.ed.

关键词： β-Ca_(3)(PO_(4))_(2) Whi.locki.e-type structure Bi.acti.e phosphates TCP Photolumi.escence Rare earths

Enhanci.g producti.n moni.ori.g: A back allocati.n methodology to esti.ate well flow rates and assi.t well test scheduli.g

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PETROLEUM RESEARCH 2024年第3期9卷 369-379页

作者： Chav.s, G. S. Ferrei.a Fi.ho, v. J. M. Uni. Fed Ri. De Janei.o Rio De Janeiro Brazil

Producti.n flow rates are cruci.l to make operati.nal deci.i.ns, moni.or, manage, and opti.i.e oi. and gas fi.lds. Flow rates also hav. a fi.anci.l i.portance to correctly allocate producti.n to fi.cal purposes requi.ed by regulatory agenci.s or to allocate producti.n i. fi.lds owned by multi.le operators. Despi.e i.s si.ni.i.ance, usually only the total fi.ld producti.n i. measured i. real ti.e, whi.h requi.es an alternati.e way to esti.ate wells' producti.n. To address these challenges, thi. work presents a back allocati.n methodology that lev.rages real-ti.e i.strumentati.n, si.ulati.ns, algori.hms, and mathemati.al programmi.g modeli.g to enhance well moni.ori.g and assi.t i. well test scheduli.g. The methodology compri.es four modules: si.ulati.n, classi.i.ati.n, error calculati.n, and opti.i.ati.n. These modules work together to characteri.e the flowli.e, wellbore, and reserv.i., v.ri.y si.ulati.n outputs, mi.i.i.e errors, and calculate flow rates whi.e honori.g the total platform flow rate. The well status generated through the classi.i.ati.n module prov.0}es v.luable i.formati.n about the current condi.i.n of each well (i.e. i. the well i. dev.0}ti.g from the latest well test parameters), ai.i.g i. deci.i.n-maki.g for well testi.g scheduli.g and pri.ri.i.i.g. The effecti.eness of the methodology i. demonstrated through i.s appli.ati.n to a representati.e offshore oi. fi.ld wi.h 14 produci.g wells and two years of dai.y producti.n data. The results hi.hli.ht the robustness of the methodology i. properly classi.yi.g the wells and obtai.i.g flow rates that honor the total platform flow rate. Furthermore, the methodology supports well test scheduli.g and prov.0}es reli.ble i.di.ators for well condi.i.ns. By uti.i.i.g real-ti.e data and adv.nced modeli.g techni.ues, thi. methodology enhances producti.n moni.ori.g and faci.i.ates i.formed operati.nal deci.i.n-maki.g i. the oi. and gas i.dustry. (c) 2024 The Authors. Publi.hi.g serv.0}es prov.0}ed by Elsev.0}r B.v. on be

关键词： Producti.n esti.ati.n Real-ti.e producti.n Producti.n moni.ori.g Back allocati.n Well test scheduli.g Flow rate esti.ati.n 2-PHASE FLOW

Selecti.n of shaped charges parameters for produci.g alumi.um parti.les wi.h v.loci.i.s i. the range of 2.5-16 km/s

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Defence Technology（防务技术） 2024年第8期38卷 126-135页

作者： v.adi.i. i.Kolpakov.Sergey v.Fedorov.Ekateri.a P.v.0}ogradov. i.i.a A.Boloti.a Bauman Moscow State Techni.al Uni.ersi.y Moscow 105005Russia

Testi.g rocket and space technology objects i. ground condi.i.ns for resi.tance to the i.pact of meteoroi.s and fragments of space debri. can be carri.d out usi.g shaped charges. To substanti.te the desi.n parameters of shaped charges that ensure the formati.n of alumi.um parti.les i. a wi.e v.loci.y range(from 2.5 to 16 km/s), numeri.al modeli.g of the formati.n process was carri.d out wi.hi. the framework of a two-di.ensi.nal axi.ymmetri. problem of conti.uum mechani.s usi.g three di.ferent computi.g codes to i.crease the reli.bi.i.y of the results. The calculati.ns consi.er shaped charges wi.h a di.meter of 20-100 mm wi.h alumi.um li.ers of v.ri.us shapes. i. i. shown that the formati.n of parti.les wi.h v.loci.i.s close to the lower li.i. of the consi.ered range i. ensured by gently slopi.g segmental li.ers of degressi.e thi.kness. To form hi.her-v.loci.y parti.les wi.h v.loci.i.s ov.r 5 km/s, i. i. proposed to use combi.ed li.ers, the jet-formi.g part of whi.h has the shape of a hemi.phere of constant thi.kness or the shape of a semi.elli.soi. or semi.superelli.soi. of rotati.n of degressi.e thi.kness.

关键词： Space debri. Meteori. i.pact Explosi.n Shaped charge Hi.h-v.loci.y alumi.um element Segmental li.er Combi.ed li.er Numeri.al si.ulati.n

Phase composi.i.n,conducti.i.y,and sensor properti.s of ceri.m-doped i.di.m oxi.e

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Nano Materi.ls Sci.nce 2024年第2期6卷 193-200页

作者： M.i.i.i. G.N.Gerasi.ov.v.F.Gromov.O.J.i.egbusi.L.i.Trakhtenberg N.N.Semenov.Federal Research Center for Chemi.al Physi.s of RAS MoscowRussia Uni.ersi.y of Central Flori.a OrlandoFLUSA Moscow i.sti.ute of Physi.s and Technology(State Uni.ersi.y) DolgoprudnyMoscow RegionRussia Lomonosov.Moscow State Uni.ersi.y MoscowRussia

The hydrothermal synthesi. of i._(2)O_(3)and CeO_(2)–i._(2)O_(3)i. i.v.sti.ated as well as the properti.s of sensor layers based on these *** the synthesi. of i._(2)O_(3),i.termedi.te products i.(OH)_(3)and i.OOH are formed,whi.h are the precursors of stable cubi.(c-i._(2)O_(3))and metastable rhombohedral(rh-i._(2)O_(3))phases,respecti.ely.A transi.i.n from c-i._(2)O_(3)to rh-i._(2)O_(3)i. observ.d wi.h the addi.i.n of CeO_(2).The i.troducti.n of ceri.m i.to rh-i._(2)O_(3)results i. a decrease i. the sensor response to hydrogen,whi.e i. i.creases i. composi.es based on c-i._(2)O_(3).The data on the sensor acti.i.y of the composi.es correlate wi.h XPS results i. whi.h CeO_(2)causes a decrease i. the concentrati.ns of chemi.orbed oxygen and oxygen v.canci.s i. rh-i._(2)O_(3).The rev.rse si.uati.n i. observ.d i. composi.es based on c-i._(2)O_(3).Compared to i._(2)O_(3)and CeO_(2)–i._(2)O_(3)obtai.ed by other methods,the synthesi.ed composi.es demonstrate maxi.um response to H_(2)at low temperatures by 70–100℃,and hav. short response ti.e(0.2–0.5 s),short recov.ry ti.e(6–7 s),and long-term stabi.i.y.A model i. proposed for the dependence of sensi.i.i.y on the di.ecti.n of electron transfer between i._(2)O_(3)and CeO_(2).

关键词： Ceri.m oxi.e i.di.m oxi.e Nanocomposi.e Hydrothermal method Cubi. phase Rhombohedral phase Sensor response Conducti.i.y Hydrogen Response/recov.ry ti.e