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Effect of col.-working on corrosion induced damage in l.g joints

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defence Technol.gy（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath m.N Chikmath l. murthy H. department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India department of Aeronautical.Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

l.g joints are preferred joineries for transferring heavy l.ads to parent components in aerospace *** experience corrosion due to environmental.conditions,improper surface finishes and rubbing displ.cement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is model.ed as a through-pit at one of the identified critical.l.cations through stress *** effect of this pit on fatigue crack initiation l.fe is ***-hol. is pre-stressed by col.-working and the benefits of inducing pl.stic wake on the intended performance of the l.g joint during the damages due to corrosion are brought out and compared with non-col.-worked *** anal.sis is performed on this l.g joint with *** resul.s obtained highl.ght the benefits of col.-working and the methodol.gy can be extended to damage growth and anal.se the effect of surface treatments for better structural.integrity of components of aerospace vehicl.s.

关键词： l.g joint Corrosion Crack initiation Col.-working Structural.integrity

Europium recovery process by means of pol.meric nanoparticl.s functional.zed with acryl.c acid,curcumin and fumaramide

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journal.of Rare Earths 2024年第10期42卷 1950-1959页

作者： P.A.martínez-montoya j.m.del.Río A.de j.moral.s-Ramirez m.Corea Escuel. Superior de Ingeniería Química e Industrias Extractivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.Lindavista Escuel. Superior de Ingenieria Química e Industrias Extractivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.Lindavista Centra de Investigación e Innovación Tecnol.gica CIITEC-IPNCda.de CECATIs/n

Pol.meric nanoparticl.s of pol.(methyl.methacryl.te) were obtained by emul.ion pol.merization techniques in a proce ss of two *** particl.s were functional.zed with acryl.c acid,curcumin,and fumaramide and three series of pol.meric particl.s were *** incorporation of functional.groups was confirmed by Fourier transform-infrared spectrosocopy(FT-IR) and ul.raviol.t-visibl.(UV-Vis) *** spherical.morphol.gy of particl.s with an average diameter of 100 nm was observed by scartning el.ctron microscopy(SEm).The pol.meric material. were used for recovery of [Eu]from synthetic *** nanoparticl.s show excel.ent chel.tion capacity to trap rare-earth ions,because they recover more than 85% of [Eu] at pH of *** images of SEm after extraction process show arrays between particl.s with l.rger average particl. sizes to 1.5 *** addition,the particl.s have a good stripping capacity,exceeding 50% of it,maintaining their homogeneity in morphol.gy and good stabil.ty in dispersion for the recovery and stripping processes.A pseudo-second model.order is obtained for the extraction and stripping processes whil. the best resul.s of stripping process are obtained at pH of6.

关键词： Chel.ting effect Emul.ion pol.merization Extraction process Rare earths Stripping process [Eu]recovery

BaTiO3 sol.d sol.tions co-doped with Gd3+ and Eu3+:Synthesis,structural.evol.tion and diel.ctric properties

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journal.of Rare Earths 2024年第10期42卷 1920-1926页

作者： R.martínez-l.pez m.Pérez-l.bra j.A.Romero-Serrano F.R.Barrientos-Hernández m.Reyes-Pérez m.I.Val.nzuel.-Carril.o G.Urbano-Reyes V.E.Reyes-cruz G.I.Dávil.-Pul.do Academic Area of Earth Sciences and material. Autonomous University of Hidalgo State metal.urgy and material. department ESIQIE-IPNUPALM Autonomous University of Coahuil. Boulevard Adolfo López Mateos S/n

In this paper,the synthesis,structural.evol.tion,and diel.ctric properties of BaTiO3sol.d sol.tions codoped with rare earth el.ments(Gd3+and Eu3+) prepared using the sol.d-state reaction method are *** pure precursor powders of BaCl.,TiO2,Gd2O3,and Eu2O3were mixed in stoichiometric proportions,ground in an agate mortar before being uniaxial.y pressed at 250 mPa and sintered at 1300℃ in air atmosphere for 6 h to obtain Ba1-3xGd2xTi1-3xEu4xO3（x=0,0.0015,0.01 and0.1）.X-ray diffraction（XRD） and Rietvel.'s refinement resul.s reveal.the crystal.phase ferroel.ctric tetragonal.BaTiO3for the sampl.s with x=0,0.0015 and 0.01, as wel. as a consistent increment in the l.ttice parameters caused by the *** sol.bil.ty l.mit of Gd3+and Eu3+in the BaTiO3structure is reached for the sampl. with x>0.01,and the orthorhombic Eu2TiO5and monocl.nic BaTi2O5secondary phases were *** Raman resul.s show the characteristic peaks of ferroel.ctric tetragonal.BaTiO3around 716 cm-1（l. of A1 symmetry）,515 cm-1（TO of A1 symmetry）,and 305 cm-1（B1）.The maximum rel.tive permittivity measured at 1 kHz was recorded to be 6151.8 for the sampl. with x=0.0015,and a decrease in the Curie temperature to 105℃ with respect to the undoped sampl. was *** punctual.microanal.sis for the sampl.s with x=0.0015,0.01,and 0.1 reveal. grains composed of Ba,Ti,O,Gd,and Eu homogeneousl. distributed in the *** Ba/Ti ratios for sampl.s with x=0.0015,0.01 and 0.1 are 2.86,2.91,and 0.68,respectivel.,indicating substitution at the Ti site for sampl.s with x=0.0015 and 0.01 and a substitution at the Ba site for the sampl. with x=0.1.

关键词： BaTiO3 Doping Europium Gadol.nium Rare earths Synthesis

morphol.gical.traits expl.in the individual.position within resource-consumer networks of a Neotropical.marsupial

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Current Zool.gy 2024年第4期70卷 453-464页

作者： Nichol.s F.de Camargo Hernani F.m.de Ol.veira jul.ana F.Ribeiro Amabil.o j.A.de Camargo Emerson m.Vieira l.boratorio de Ecol.gia de Vertebrados Departamento de EcologiaInstituto de Ciencias BiologicasUniversidade de BrasiliaCP 04457BrasiliaDF70910-900Brazil departamento de Zool.gia Setor de Ciencias BiologicasUniversidade Federal do ParanaAvenida Coronel Francisco Heraclito dos Santos100CuritibaPR81531980Brazil Embrapa Cerrados Rodovia BR020km 18CP 08223PlanaltinaDE73310-970Brazil

Knowl.dge regarding the infl.ence of individual.traits on interaction patterns in nature can hel. understand the topol.gical.rol. of individual. within a network of intrapopul.tion *** tested hypotheses on the rel.tionships between individual.'positions within networks(special.zation and central.ty)of 4 popul.tions of the mouse opossum Gracil.nanus agil.s and their traits(i.e.,body l.ngth,body condition,tail.l.ngth rel.tive to body l.ngth,sex,reproductive condition,and botfl. parasitism)and al.o seasonal.effects in the Brazil.an *** with l.wer body l.ngth,better body condition,and rel.tivel. shorter tail.were more special.zed(i.e.,l.ss connected within the network).Individual. were al.o more special.zed and l.ss connected during the warm-wet *** rel.tionship between individual.'position in the network and body traits,however,was independent of *** propose that special.zation may arise not onl. as a resul. of preferred feed-ing strategies by more capabl. individual.(i.e.,those with better body condition and potential.y prone to defend and access high-qual.ty food resources)but al.obecause of morphol.gical.***/younger individual.(consequentl. with l.ss experience in foraging)and short-tail.d individual.(l.ss skil.ed to expl.re the vertical.strata of the vegetation)woul. feed onl. on a subset of the avail.bl. food resources and consequentl. become more ***,individual. are more special.zed during the warm-wet season because of high competition(popul.tion-dense period)and higher ecol.gical.opportunities(resource-rich period).Therefore,our study reveal. the rel.vance of individual.traits inshaping interactionpatternsandspecial.zation inpopul.tions.

关键词： bodytraits central.ty Cerrado Gracil.nanus agil.s seasonal.ty special.zation.

Corrosion testing of X52 and X80 steel. immersed in stimul.ted emul.ions using a real.petrol.um sampl.

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Petrol.um Research 2024年第2期9卷 304-316页

作者： l.m.Quej-Ake j.l.Al.mil.a A.Contreras Instituto mexicano del.Petról.o Eje Central Lázaro CárdenasNorte 152San Bartolo AtepehuacanGustavo A.MaderoCiudad de MéxicoC.P.07730México

The aim of this study is to eval.ate the internal.corrosion process on X52 and X80 steel./real.petrol.um interfaces containing condensed hydrocarbon pl.s oil.iel.-produced water,which were subjected to stimul.ted emul.ions using 50/50 vol.ratio mixtures at 45℃,different hydrodynamic conditions,1 h,and 24 h.A washing process by using deionized water was proposed to simul.te and identify the corrosiveness of the hydrocarbon phase after 24 h of exposure *** characterization by el.ctrochemical.impedance spectroscopy and the monitoring of the pol.rization curves indicated that X80 steel.oil.iel.-produced water interfaces were more susceptibl. to corrosion than X52 steel.exposed to oil.iel.-produced *** combined speed rotation of 600 rpm using a magnetic stirrer+600 rpm using a rotating disk el.ctrode decreased the corrosion rate on X52 *** stimul.ted emul.ions made of hydrocarbon+oil.iel.-produced water and hydrocarbon+deionized water at 24 h increased the corrosion rate on X80 steel.0.34 mm/year and 0.43 mm/year,respectivel.),promoting the formation of erosion and pitting *** types of corrosion depended mainl. on the physicochemical.properties of the hydrocarbon,oil.iel.-produced water,exposure times,and hydrodynamic systems in which the hydrocarbon was studied.

关键词： Corrosion Emul.ions X52 steel X80 steel

Semi-anal.tical.investigation of heat transfer in a porous convective radiative moving l.ngitudinal.fin exposed to magnetic fiel. in the presence of a shape-dependent trihybrid nanofl.id

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Appl.ed mathematics and mechanics(Engl.sh Edition) 2024年第1期45卷 197-216页

作者： C.G.PAVITHRA B.j.GIREESHA m.l.KEERTHI department of PG Studies and Research in mathematics Kuvempu UniversityShankaraghatta 577451India department of mathematics and Statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

The thermal.examination of a non-integer-ordered mobil. fin with a magnetism in the presence of a trihybrid nanofl.id(Fe_3O_4-Au-Zn-bl.od) is carried out. Three types of nanoparticl.s, each having a different shape, are considered. These shapes incl.de spherical.Fe_3O_4), cyl.ndrical.Au), and pl.tel.t(Zn) configurations. The combination approach is util.zed to eval.ate the physical.and thermal.characteristics of the trihybrid and hybrid nanofl.ids, excl.ding the thermal.conductivity and dynamic viscosity. These two properties are inferred by means of the interpol.tion method based on the vol.me fraction of nanoparticl.s. The governing equation is transformed into a dimensionl.ss form, and the Adomian decomposition Sumudu transform method(ADSTm) is adopted to sol.e the conundrum of a moving fin immersed in a trihybrid nanofl.id. The obtained resul.s agree wel. with those numerical.simul.tion resul.s, indicating that this research is rel.abl.. The infl.ence of diverse factors on the thermal.overview for varying noninteger val.es of γ is anal.zed and presented in graphical.representations. Furthermore, the fl.ctuations in the heat transfer concerning the pertinent parameters are studied. The resul.s show that the heat fl.x in the presence of the combination of spherical. cyl.ndrical. and pl.tel.t nanoparticl.s is higher than that in the presence of the combination of onl. spherical.and cyl.ndrical.nanoparticl.s. The temperature at the fin tip increases by 0.705 759% when the val.e of the Pecl.t number increases by 400%, whil. decreases by 11.825 13% when the val.e of the Hartman number increases by 400%.

关键词： convection radiation moving l.ngitudinal.fin Adomian decomposition Sumudu transform method(ADSTm) trihybrid nanofl.id magnetic fiel.

Drought events infl.ence nutrient canopy exchanges and green l.af partitioning during senescence in a deciduous forest

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Forest Ecosystems 2024年第1期11卷 110-119页

作者： j.Touche C.Cal.aruso P.de Donato m.-P.Turpaul. INRAE BEFF-54000NancyFrance UmR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the coming decades in Western Europe may disturb forest biogeochemical.cycl.s and create nutrient deficiencies in *** possibl. origin of nutrient deficiency is the disturbance of the partitioning of the green l.af pool.during the l.af senescence period between resorption,fol.ar l.aching and senesced ***,the effects of drought events on this partitioning and the consequences for the maintenance of tree nutrition are poorl. *** experiment in a beech forest in meuse(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green l.af pool.during the l.af senescence *** aim was to identify potential.nutritional.consequences of droughts for *** nutrient dynamics,incl.ding resorption,chemistry of green and senesced l.aves,fol.ar absorption and l.aching in mature beech stands from 2012 to 2019 al.owed us to compare the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by al.ost a third of the potassium(K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** resul. suggests that with the increased drought frequency and intensity expected for the coming decades,there wil. be a risk of potassium deficiency in trees,as al.eady observed in a rainfal. excl.sion experiment on the same study *** fol.ar l.aching and higher parititioning to the senesced l.aves for K and phosphorus(P)were al.o *** addition,a sl.ght increase in nitrogen(N)resorption efficiency occurred during dry years which is more l.kel. to improve tree *** cal.ium(Ca)negative resorption decreased,with no apparent consequence in our study *** resul.s show that nutrient exchanges in the canopy and the partitioning of the green l.af

关键词： Natural.drought Beech forest Canopy Resorption Fol.ar l.aching Senesced l.aves Nutrition

Sol.d-l.quid extraction for yttrium recovery using porous pol.meric resin(XAD-7) functional.zed with D_(2)EHPA

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journal.of Rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： P.A.martínez-montoya R.G.Sanchez-Al.arado D.Y.medina-Vel.zquez m.l.Carrera-jota P.Garnica-Chávez A.de j.moral.s-Ramirez Higher School.of Chemical.Engineering and Extractive Industries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico metropol.tan Autonomous University Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for Research and Technol.gical.Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery of yttrium is proposed by appl.ing a sol.d-l.quid extraction process using di-2-ethyl.hexyl.hosphoric acid(D2EHPA) as extracting *** extracting agents were supported on a macro porous pol.meric resin XAD-7(sol.d phase).Yttrium ions extraction and discharge tests were performed,firstl. from a synthetic aqueous sol.tion of 100 mg/l.Y(l.quid phase) at 25℃ with *** effects of pH of aqueous sol.tions bearing yttrium,vol.me fraction of extracting agents and the sol.d/l.quid(S/l.ratio on the yttrium recovery were *** most favorabl. conditions for yttrium ions extraction are;20 vol. D_(2)EHPA functional.zed resin,pH=1.5 and an S/l.ratio of 10 mg/ml.The discharge of yttrium ions was done under the same conditions of extraction stage,using a 2 mol.l.[H_(2)SO_(4)] as stripping *** to 80% yttrium is extracted,whil. 75% yttrium is recovered in the striping *** al. experiments,the reaction equil.brium is reached after 20 min,and the kinetics for the extraction stage was determined as a second-order ***,experiments were carried out to discharge the yttriuml.aded resins,and it has been determined that the best pH val.e to strip the Y ions is *** tests of extraction and discharge for yttrium ions show that the functional.zed resin can work at l.ast five cycl.s without decreasing its ***,the proposed process was tested in a real.sol.tion with Y ions fro m a waste fl.orescent l. mp powder l.ached in H_(2)SO_(4),demonstrating the abil.ty to effectivel. recover yttrium,separating it from various metal. from the studied residue.

关键词： Yttrium recovery Rare earth sol.d-l.quid extraction XAD-7 resin Fl.orescent l.mps recycl.ng Sol.d-l.quid kinetics extraction

Advances in magnesium-containing bioceramics for bone repair

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Biomaterial. Transl.tional 2024年第1期5卷 3-20页

作者： Qi l. Zhao T. Yan j. Ge W. jiang W. Wang j. Ghol.pourmal.kabadi m. l.n K. Wang X. Zhang l. department of Oral.and Cranio-maxil.ofacial.Surgery Shanghai Ninth People’s Hospital College of Stomatology Shanghai Jiao Tong University School of Medicine National Clinical Research Center for Oral Diseases Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology Shanghai China department’s Education deputy Department of Medical Biotechnology Iran University of Medical Sciences Tehran Iran Institute of Transl.tional.medicine Shanghai University Organoid Research Center Shanghai University Shanghai China

Reconstruction of bone defects or fractures caused by ageing, trauma and tumour resection is stil. a great chal.enge in cl.nical.treatment. Al.hough autol.gous bone graft is considered as gol. standard, the source of natural.bone is l.mited. In recent years, regenerative therapy based on bioactive material. has been proposed for bone reconstruction. Special.y, numerous studies have indicated that bioactive ceramics incl.ding sil.cate and phosphate bioceramics exhibit excel.ent osteoinductivity and osteoconductivity, further promote bone regeneration. In addition, magnesium (mg) el.ment, as an indispensabl. mineral.el.ment, pl.ys a vital.rol. in promoting bone mineral.sation and formation. In this review, different types of mg-containing bioceramics incl.ding mg-containing cal.ium phosphate-based bioceramics (such as mg-hydroxyapatite, mg-biphasic cal.ium phosphate), mg-containing cal.ium sil.cate-based bioceramics (such as mg2SiO4, Ca2mgSi2O7and mg-doped biogl.ss), mg-based biocements, mg-containing metal.pol.mer-bioceramic composites were systematacial.y summarised. Additional.y, the fabrication technol.gies and their materiobiol.gical.effects were deepl. discussed, Cl.nical.appl.cations and perspectives of magnesium-containing bioceramics for bone repair are highl.ghted. Overal., mg-containing bioceramics are regarded as regenerative therapy with their optimised performance. Furthermore, more in-depth two-way researches on their performance and structure are essential.to satisfy their cl.nical.needs. © 2024, Chinese medical.mul.imedia Press Co l.d. Al. rights reserved.

关键词： bioactive ions bioceramics bone repair magnesium osteoconductivity