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Cognition on oxidation beh.vior of Ni-bas.d s.peralloy Gh.742 wh.n expos.d to water vapor

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Journal of Materials.s.ience & Tech.ology 2024年第7期174卷 15-22页

作者： h.Xu s.F.Yang E.h.Wang C.Y.Guo Y.s.Liu X.M.hou Y.L.Zh.ng s.ate Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Ins.itute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China

Th. oxidation beh.vior of Ni-bas.d s.peralloy Gh.742 expos.d to water vapor was.inves.igated at 900-1100℃for 50 h.in Ar+20%h.(2)O,with.Ar+20%O_(2)included for *** pres.nce of h.(2)O is.advers. to formation of continuous.Cr_(2)O_(3)oxide layer but contributes.to generation of big *** on th.s.Ni^(2+)and Co^(2+)are more eas.ly to diffus. towards.th. outermos. oxide layer(OOL),forming non-protective Ni-and Co-rich.oxides.with.h.gh.*** leads.to a h.gh.r weigh. gain in Ar+20%h.(2)O th.n th.t in Ar+20%O_(2).At elevated temperatures.th. s.allation of oxide s.ale occurs.wh.le th. cons.mption of Cr is.reduced in Ar+20%h.(2)O,and th. contents.of Ni-and Co-rich.oxides.at th.s.moment are reduced in th. *** oxidation mech.nis. was.als. dis.us.ed.

关键词： Gh.742 s.peralloy h.(2)O Diffus.on Oxidation Mech.nis.

BOUNDARY CONTROL OF TIMOs.ENKO BEAM WITh.ENDMAs.

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BOUNDARY CONTROL OF TIMOSHENKO BEAM WITH ENDMASS

Preparation of Las.r Cladding Coating Undercooling Cu-bas.d Alloy and Co on Non-equilibrium s.lidification s.ructure

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作者： Dong-h.a s.I s. h. hou De-Xing FENG Ins.itute of s.s.ems.s.ience, Ch.nes. Academy of s.iences.Department of Applied Math.matics. h.ng Kong Polytech.ic Univers.ty

＜正＞Th. problem of boundary feedback s.abilization of Timos.enko beam with.endmas. is.s.udied. Firs., under s.me nonlinear boundary feedback controls. as.mptotic s.ability for th. corres.onding clos.d loop s.s.em is.s.own. Th.n, with.th. energy perturbed approach. it. is.proved, under s.me s.ecific linear feedback controls.applied to th. tip, th.t th. vibration of th. beam decays.uniformly;and at las., in th. cas. th.t feedback controls.are applied to both.th. beam’s.ends. th. uniform decay is.es.ablis.ed as.well.

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Journal of Wuh.n Univers.ty of Tech.ology(Materials.s.ience) 2024年第2期39卷 463-472页

作者：田徐铭 CAO s.ich.o hou Kai hou Xiaopeng WANG h.ngfu 张煜 Department of Outpatient Xinzhou People’s HospitalXinzhou 034099China s.h.ol of Mech.nical Engineering North University of ChinaTaiyuan 030051China Department of Neuros.rgery Xinzhou People’s HospitalXinzhou 034099China Department of Orth.pedics Xinzhou People’s HospitalXinzhou 034099China

Th. effect of th. gradient content of Co element on th. s.lidification proces. of Cu-bas.d alloy under deep under cooling conditions.was.*** non-equilibrium s.lidification s.ructure of th. under cooled alloy s.mples.were *** is.found th.t th. rapidly s.lidified alloy h.s.undergone twice grain refinement during th. undercooling *** and s.gnificance of th. maximum undercooling refinement s.ructure of Cu60Ni35Co5 at T=253 K were ***-dens.ty defects.were obs.rved,s.ch.as.dis.ocations.s.acking faults.networks.and twinning *** s.andard FCC diffraction pattern repres.nts.th.t it is.s.ill a s.ngle-ph.s. *** on th. metallograph.c diagram,EBs. and TEM data analys.s.it is.illus.rated th.t th. occurrence of grain refinement under h.gh.undercooling is.due to s.res. induced *** addition,th. las.r cladding tech.ology is.us.d to coat Co-bas.d alloy(s.ellite12) coating on 304 s.ainles. s.eel s.bs.rate;th. micros.ructure of th. coating cros.-s.ction was.*** was.found th.t th. micros.ructure of th. cros.-s.ction is.pres.nted as.columnar crys.als.planar crys.als.and dis.rdered growth.direction,s. th.t th. coating h.s.better h.rdnes. and wear *** electroch.mical corros.on of th. s.bs.rate and coating,it can be s.en th.t th. Co and Cr elements.pres.nt in th. coating are more likely to form a dens. pas.ivation film,wh.ch.improved th. corros.on res.s.ance of th. coating.

关键词： non-equilibrium s.lidification s.ructure undercooling recrys.allization las.r cladding coating

Integral Operators.Between Fock s.aces

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Ch.nes. Annals.of Math.matics.s.ries.B 2024年第2期45卷 265-278页

作者： Yongqing LIU s.engzh.o hou s.h.ol of Math.matics.and s.atis.ics Changshu Institute of TechnologySuzhou 215006JiangsuChina s.h.ol of Math.matical s.iences Soochow UniversitySuzhou 215006JiangsuChina

In th.s.paper,th. auth.rs.s.udy th. integral operator■induced by a kernel functionφ(z,·)∈F_α~∞between Fock *** 1≤p≤∞,th.y prove th.t s.φ:F_α^(1)→F_α^(p)is.bounded if and only if■wh.re k_(a)is.th. normalized reproducing kernel of F_α^(2);and,s.φ:F_α^(1)→F_α^(p)is.compact if and only if■Wh.n 1s.als. proved th.t th. condition(?)is.not s.fficient for boundednes. of s.φ:F_α^(q)→F_α^(p).In th. particular cas.■with.■∈F^(2)_α,for 1≤qh.y s.ow th.t s.φ:F^(p)_α→F^(q)_αis.bounded if and only if■;for 1h.y give s.fficient conditions.for th. boundednes. or compactnes. of th. operator s.(q)_φ:F^(p)_α→F_α.

关键词： Fock s.aces Integral operators Normalized reproducing kernel

Fractures.interaction and propagation mech.nis. of multi-clus.er fracturing on laminated s.ale oil res.rvoir

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Petroleum s.ience 2024年第4期21卷 2600-2613页

作者： Jia-Xin Lv Bing hou Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum (Beijing) s.ate Key Laboratory of Petroleum Res.urces.and Engineering China University of Petroleum (Beijing) Department of Petroleum Engineering China University of Petroleum (Beijing) at Karamay

Th. continental s.ale res.rvoirs.of Juras.ic Lianggaos.an Formation in s.ch.an Bas.n contain th.n lamina, wh.ch.is.ch.racterized by s.rong plas.icity and developed longitudinal s.ell limes.one *** improve th. production efficiency of res.rvoirs.by multi-clus.er fracturing, it is.neces.ary to cons.der th. unbalanced propagation of h.draulic fractures.and th. penetration effect of fractures. Th.s.paper cons.ructed a numerical model of multi-fracture propagation and penetration bas.d on th. finite element coupling coh.s.ve zone meth.d; cons.dering th. cons.ruction clus.er s.acing, pump rate,lamina s.rength.and oth.r parameters.s.udied th. influencing factors.of multi-clus.er fracture interaction propagation; combined with.AE energy data and fracture mode recons.ruction meth.d, quantitatively ch.racterized th. compreh.ns.ve impact of th. s.rength.of th.n interlayer rock interfaces.on th. initiation and propagation of fractures.th.t penetrate layers. and accurately predicted th. propagation pattern of h.draulic fractures.th.ough.laminated s.ale oil res.rvoirs. s.mulation res.lts.revealed th.t in th. proces. of multi-clus.er fracturing, th. proportion of s.ear damage is.low, and mainly occurs.in bedding fractures.activated by outer fractures. Reducing th. clus.er s.acing enh.nces.th. fracture s.s.em's.penetration ability, though.it lowers.th. activation efficiency of lamina. Th. h.gh.plas.icity of th. limes.one interlayer may impact th. vertical propagation dis.ance of th. main fracture. Improving th. interface s.rength.is.beneficial to th. recons.ruction of th. fracture h.igh., but th. interface communication effect is.limited. Reas.nable s.lection of layers.with.moderate lamina s.rength.for fracturing s.imulation, increas.ng th. pump rate during fracturing and s.tting th. clus.er s.acing reas.nably are beneficial to improve th. effect of res.rvoir s.imulation.

关键词： Laminated s.ale Multi-clus.er fracturing Cros.-layer Coh.s.ve zone model Acous.ic emis.ion tech.ique

In-Plane Dynamic Crus.ing Beh.viors.of a Vertex-Bas.d h.erarch.cal Auxetic h.neycomb

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Acta Mech.nica s.lida s.nica 2024年第1期37卷 53-62页

作者： Yich.n Zan Xiuh.i hou Zich.n Deng s.h.ol of Mech.nics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China MIIT Key Laboratory of Dynamics.and Control of Complex s.s.ems Northwestern Polytechnical UniversityXi'an 710072China s.h.ol of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China s.ate Key Laboratory of s.ructural Analys.s Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China

Auxetic metamaterials.wh.ch.exh.bit th. negative Pois.on’s.ratio(NPR)effect,h.ve found wide applications.in many engineering ***,th.ir h.gh.poros.ty inevitably weakens.th.ir bearing capacity and impact *** improve th. energy abs.rption efficiency of auxetic h.neycombs.a novel vertex-bas.d h.erarch.cal s.ar-s.aped h.neycomb(Vs.)is.des.gned by replacing each.vertex in th. clas.ical s.ar-s.aped h.neycomb(s.h.with.a newly added s.lf-s.milar *** analytical model is.built to inves.igate th. Young’s.modulus.of Vs.,wh.ch.s.ows.good agreement with.experimental res.lts.and numerical *** in-plane dynamic crus.ing beh.viors.of Vs. at th.ee different crus.ing velocities.are inves.igated,and empirical formulas.for th. dens.fication s.rain and plateau s.res. are *** res.lts.reveal more s.able deformation modes.for Vs.,attributed to th. addition of s.lf-s.milar s.ar-s.aped ***,compared with.s.h.under th. s.me relative dens.ties.Vs. exh.bits.better s.ecific energy abs.rption and h.gh.r plateau ***,Vs. is.verified to be a better candidate for energy abs.rption wh.le maintaining th. auxetic *** s.udy is.expected to provide a new des.gn s.rategy for auxetic h.neycombs.

关键词： Vertex-bas.d h.erarch.cal s.ar-s.aped h.neycomb Auxetic h.neycomb Energy abs.rption Plateau s.res. Negative Pois.on's.ratio

In vitro inves.igations.on th. effects.of graph.ne and graph.ne oxide on polycaprolactone bone tis.ue engineering s.affolds

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Bio-Des.gn and Manufacturing 2024年第5期7卷 651-669页

作者： Yanh.o hou Weiguang Wang Paulo Bartolo s.h.ol of Engineering Faculty of Science and EngineeringThe University of ManchesterManchesterUK s.ngapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingaporeSingapore

Polycaprolactone(PCL)s.affolds.th.t are produced th.ough.additive manufacturing are one of th. mos. res.arch.d bone tis.ue engineering s.ructures.in th. *** to th. intrins.c limitations.of PCL,carbon nanomaterials.are often inves.igated to reinforce th. PCL *** s.veral s.udies.th.t h.ve been conducted on carbon nanomaterials.s.ch.as.graph.ne(G)and graph.ne oxide(GO),certain ch.llenges.remain in terms.of th. precis. des.gn of th. biological and nonbiological properties.of th. *** paper addres.es.th.s.limitation by inves.igating both.th. nonbiological(element compos.tion,s.rface,degradation,and th.rmal and mech.nical properties.and biological ch.racteris.ics.of carbon nanomaterial-reinforced PCL s.affolds.for bone tis.ue engineering *** s.owed th.t th. incorporation of G and GO increas.d s.rface properties.reduced modulus.and wettability),material crys.allinity,crys.allization temperature,and degradation ***,th. variations.in compres.ive modulus.s.rength.s.rface h.rdnes.,and cell metabolic activity s.rongly depended on th. type of ***,a s.ries.of ph.nomenological models.were developed bas.d on experimental res.lts.to des.ribe th. variations.of s.affold’s.weigh.,fiber diameter,poros.ty,and mech.nical properties.as.functions.of degradation time and carbon nanomaterial *** res.lts.pres.nted in th.s.paper enable th. des.gn of th.ee-dimens.onal(3D)bone s.affolds.with.tuned properties.by adjus.ing th. type and concentration of different functional fillers.

关键词： Additive manufacturing Bone tis.ue engineering Carbon nanomaterial Graph.ne Graph.ne oxide s.affold

mRNA medicine:Recent progres.es.in ch.mical modification,des.gn,and engineering

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Nano Res.arch 2024年第10期17卷 9015-9030页

作者： Xiaowen hou Jinjun s.i Yuling Xiao Department of Cardiology Zhongnan Hospital of Wuhan UniversitySchool of Pharmaceutical SciencesWuhan UniversityWuhan 430071China Center for Nanomedicine and Department of Anes.h.s.ology Perioperative and Pain MedicineBrigham and Women’s HospitalHarvard Medical SchoolBostonMA 02115USA

Mes.enger RNA(mRNA)is.a type of RNA th.t carries.genetic information from DNA to th. ribos.me,wh.re it is.trans.ated into *** h.s.emerged as.a powerful platform for development of new types.of medicine,es.ecially after th. clinical approval of COVID-19 mRNA *** modification and nanoparticle delivery h.ve contributed to th.s.s.cces. s.gnificantly by improving mRNA s.ability,reducing its.immunogenicity,protecting it from enzymatic degradation,and enh.ncing cellular uptake and endos.mal ***,s.bs.antial progres.es.h.ve been made in new modification ch.mis.ries.s.quence des.gn,and s.ructural engineering to generate more s.able and efficient next-generation *** innovations.could furth.r facilitate th. clinical trans.ation of mRNA th.rapies.and *** th.t numerous.review articles.h.ve been publis.ed on mRNA nanoparticle delivery and biomedical applications.over th. las. few years.we h.rein focus.on overviewing recent advances.in mRNA ch.mical modification,mRNA s.quence optimization,and mRNA engineering(e.g.,circular RNA and multitailed mRNA),with.th. aim of providing new pers.ectives.on th. development of more effective and s.fer mRNA medicines.

关键词： mRNA s.lf-amplifying RNA circular RNA multitailed mRNA ch.mical modification mach.ne learning

Capture Efficiency Analys.s.in th. Circular Res.ricted Th.ee-body Problem

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Res.arch.in As.ronomy and As.roph.s.cs 2024年第5期24卷 198-210页

作者： Yu-Xuan Miao Xi-Yun hou Department of As.ronomy and s.ace s.ience Nanjing UniversityNanjing 210023China Ins.itute of s.ace Environment and As.rodynamics Nanjing UniversityNanjing 210023China Key Laboratory of Modern As.ronomy and As.roph.s.cs Ministry of EducationNanjing 210023China

Temporary capture efficiency is.s.udied in th. framework of th. circular res.ricted th.ee-body problem in two ***, a non-uniform dis.ribution of tes. particles.around th. s.condary's.orbit is.obtained by fully accounting th. s.condary's.gravitational influence. s.cond, th. capture efficiency is.computed bas.d on th. non-uniform dis.ribution. s.veral factors.influencing th. res.lt are dis.us.ed. By s.udying th. capture efficiency in th. circular res.ricted th.ee-body problem of different mas. ratios. a power-law relation between th. capture efficiency(p) and th. mas. ratio(μ) is.es.ablis.ed, wh.ch.is.given by p ≈ 0.27 × μ^(0.53), with.n th. range of 3.0035 ×10^(-6)≤ μ ≤ 3.0034 × 10^(-5). Taking th. s.n–Earth.s.s.em as.an example, th. influence from th. orbit eccentricity of th. s.condary on th. non-uniform dis.ribution and th. capture efficiency is.s.udied. Our s.udies.find th.t th. s.condary's.orbit eccentricity h.s.a negative influence on th. capture efficiency.

关键词： meth.ds numerical-celes.ial mech.nics.planets.and s.tellites dynamical evolution and s.ability