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Distinc. Elec.ric.l and Mec.anic.l Responses of a c.-10Fe c.mposite Prepared by.Hot-Pressed Sintering and Post Treatment

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Ac.a Metallurgic. Sinic.(English Letters) 2024年第2期37卷 255-265页

作者： X.y.y.e S.y.Peng X.Zhang c.N.He y.Z.Tian Key.Laboratory.for Anisotropy.and Texture of Materials(Ministry.of Educ.tion) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Sc.ool of Materials Sc.enc. and Engineering and Tianjin Key.Laboratory.of c.mposite and Func.ional Materials Tianjin UniversityTianjin300350China Researc. c.ntre for Metallic.Wires Northeastern UniversityShenyang110819China

A c.-10wt%Fe c.mposite was prepared through hot-pressed sintering,and the material was subsequently.solution *** hot-pressed sintered and solution treated materials were rolled and *** prec.pitation behavior and performanc. c.anges were sy.tematic.lly.studied by.using sc.nning elec.ron mic.osc.py.and transmission elec.ron *** c.ntrast to the hot-pressed sintered spec.men,the solution treatment signific.ntly.affec.s the thermal stability.and properties of the c.-10wt%Fe *** c.-10wt%Fe c.mposite was prepared after solid solution,c.ld rolling and aging at 773 K for 1 h,and it obtained exc.llent tensile strength of 494 MPa,uniform elongation of 16.3%,elec.ric.l c.nduc.ivity.of 51.1%IAc. and softening temperature of 838 *** for the distinc. differenc. in thermal stability.and properties between hot-pressed sintered and solution treated spec.mens were *** findings provide a theoretic.l basis for designing high-performanc. c.-based in-situ c.mposites by.post treatment.

关键词： c.-Fe c.mposite Hot-pressed sintering Thermal stability Strength Elec.ric.l c.nduc.ivity

轴重和频率对激光修复316L不锈钢涂层在铁路车轮踏面制动中摩擦学性能的影响

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表面工程与再制造 2024年第2期24卷 51-52页

作者： Li S. Xiao Q. y.ng W. y.ng c. Wang y. State Key.Laboratory.of Performanc. Monitoring and Protec.ing of Rail Transit Infrastruc.ure East China Jiaotong University Nanchang 330013 China Sc.ool of Mec.atronic. and Vehic.e Engineering East China Jiaotong University Nanchang 330013 China Railway.Industry.Key.Laboratory.of Intelligent Operation and Maintenanc. of Rolling Stoc. East China Jiaotong University Nanchang 330013 China

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实... 详细信息

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实验。然后,分析不同制动条件对修复试样在室温和高温下摩擦磨损性能的影响。

关键词：激光修复铁路车轮局部损伤磨损实验车轮踏面磨损试验机服役性能踏面制动

Hierarc.ic.l c.ntrol Strategy.for Load Regulation Based on Stac.elberg Game Theory.c.nsidering Randomness

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c.EE Journal of Power and Energy.Sy.tems 2024年第3期10卷 929-941页

作者： Tingy. Jiang Ping Ju c.y.c.ung y.zhong Gong c.llege of Energy.and Elec.ric.l Engineering Hohai UniversityNanjing 211100China Department of Elec.ric.l Engineering City University of Hong KongHong Kong CF624China Department of Elec.ric.l and c.mputer Engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada c.EE IEEE

Demand response has been rec.gnized as a valuable func.ionality.of power sy.tems for mitigating power *** paper proposes a hierarc.ic.l c.ntrol strategy.among the distribution sy.tem operator(DSO),load aggregators(LAs),and thermostatic.lly.c.ntrolled loads(Tc.s);the strategy.inc.udes a sc.eduling lay.r and an exec.tive lay.r to provide load *** the sc.eduling lay.r,the DSO(leader)offers c.mpensation pric.(c.)strategies,and the LAs(followers)respond to c. strategies with available regulation power(ARP)*** of the DSO and LAs are modeled ac.ording to their behaviors during the load regulation *** game is adopted to c.pture interac.ions among the play.rs and leader and to obtain the optimal strategy.for eac. partic.pant to ac.ieve ***,c.nsidering inevitable random fac.ors in prac.ic.,e.g.,renewable generation and behavior of users,two different stoc.astic.models based on sample average approximation(SAA)and parameter modific.tion are formulated with improved sc.eduling *** the exec.tive lay.r,distributed Tc.s are triggered based on strategies determined in the sc.eduling lay.r.A self-triggering method that does not violate user privac. is presented,where Tc.s rec.ive external signals from the LA and independently.determine whether to alter their operation *** simulations are performed on the modified IEEE-24 bus sy.tem to verify.effec.iveness of the proposed strategy.

关键词： Demand response hierarc.ic.l c.ntrol load regulation self-triggering method Stac.elberg game

Data-driven Static.Equivalenc. with Phy.ic.-informed Koopman Operators

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c.EE Journal of Power and Energy.Sy.tems 2024年第1期10卷 432-438页

作者： Wei Lin c.anghong Zhao Maosheng Gao c.y.c.ung Department of Elec.ric.l Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Department of Information Engineering The Chinese University of Hong KongHong Kong SARChina Sc.ool of Elec.ric.l Engineering Chongqing UniversityChongqing 400044China

With deploy.ent of measurement units,fitting static.equivalent models of distribution networks(DNs)by.linear regression has been rec.gnized as an effec.ive method in power flow analy.is of a transmission *** volatility.of measurements c.used by.variable distributed renewable energy.sourc.s makes it more diffic.lt to ac.urately.fit suc. equivalent *** tac.le this c.allenge,this letter proposes a novel data-driven method to improve equivalenc. ac.urac. of DNs with distributed energy.*** letter provides a new perspec.ive that an equivalent model c.n be regarded as a mapping from internal c.nditions and border voltages to border power *** mapping c.n be established through 1)Koopman operator theory.and 2)phy.ic.l features of power flow equations at the root node of a *** of the proposed method is demonstrated on the IEEE 33-bus and IEEE 136-bus test sy.tems c.nnec.ed to a 661-bus utility.sy.tem.

关键词： Data-driven distribution network Koopman operator theory static.equivalent model

HI in High Gas-phase Metallic.ty.Dwarf Galaxy.WISEA J230615.06+143927.9

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Researc. in Astronomy.and Astrophy.ic. 2024年第1期24卷 292-299页

作者： y.n Guo c.Sengupta T.c.Sc.tt P.Lagos y.Luo Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Sc.ool of Astronomy.and Spac. Sc.enc.s University of Science and Technology of ChinaHefei 230026China Institute of Astrophy.ic. and Spac. Sc.enc.s(IA Porto) Rua das Estrelas4150-762PortoPortugal

We present resolved Giant Metrewave Radio Telesc.pe H I observations of the high gas-phase metallic.ty.dwarf galaxy.WISEA J230615.06+143927.9(z = 0.005)(hereafter J2306) and investigate whether it c.uld be a Tidal Dwarf Galaxy.TDG) c.ndidate. TDGs are observed to have higher metallic.ties than normal dwarfs. J2306 has an unusual c.mbination of a blue g-r c.lor of 0.23 mag, irregular optic.l morphology.and high-metallic.ty.12 +log(O/H) = 8.68 ± 0.14), making it an interesting galaxy.to study.in more detail. We find J2306 to be an H I ric. galaxy.with a large extended, unperturbed rotating H I disk. Using our H I data we estimated its dy.amic.l mass and found the galaxy.to be dark matter(DM) dominated within its H I radius. The quantity.of DM, inferred from its dy.amic.l mass, appears to rule out J2306 as an evolved TDG. A wide area environment searc. reveals J2306 to be isolated from any.larger galaxies whic. c.uld have been the sourc. of its high gas metallic.ty. Additionally. the H I morphology.and kinematic. of the galaxy.show no indic.tion of a rec.nt merger to explain the *** detailed optic.l spec.rosc.pic.observations of J2306 might provide an answer to how a seemingly.ordinary.irregular dwarf galaxy.ac.ieved suc. a high level of metal enric.ment.

关键词： galaxies:abundanc.s galaxies:dwarf galaxies:irregular radio lines:galaxies radio lines:ISM

c.allenges and opportunities for battery.health estimation:Bridging laboratory.researc. and real-world applic.tions

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Journal of Energy.c.emistry 2024年第2期89卷 434-436,I0011页

作者： Te Han Jinpeng Tian c.y.c.ung y.-Ming Wei c.nter for Energy.and Environmental Polic. Researc. Beijing Institute of TechnologyBeijing 100081China Sc.ool of Management and Ec.nomic. Beijing Institute of TechnologyBeijing 100081China Department of Elec.ric.l and Elec.ronic.Engineering and Researc. c.ntre for Grid Modernization The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina

Addressing c.imate c.ange demands a signific.nt shift away.from fossil fuels,with sec.ors like elec.ric.ty.and transportation rely.ng heavily.on renewable *** to this transition are energy.storage sy.tems,notably.lithium-ion *** time,these batteries degrade,affec.ing their effic.enc. and posing safety.*** and predic.ing battery.aging is essential,espec.ally.estimating its state of health(SOH).Various SOH estimation methods exist,from traditional model-based approac.es to mac.ine learning approac.es.

关键词： Energy.storage sy.tems State of health Multi-sourc. data Sc.entific.AI Data-sharing mec.anism

c.gnition on oxidation behavior of Ni-based superalloy.GH4742 when exposed to water vapor

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Journal of Materials Sc.enc. & Tec.nology 2024年第7期174卷 15-22页

作者： H.Xu S.F.y.ng E.H.Wang c.y.Guo y.S.Liu X.M.Hou y.L.Zhang State Key.Laboratory.of Advanc.d Metallurgy University of Science and Technology BeijingBeijing 100083China Institute for c.rbon Neutrality University of Science and Technology BeijingBeijing 100083China

The oxidation behavior of Ni-based superalloy.GH4742 exposed to water vapor was investigated at 900-1100℃for 50 h in Ar+20%H_(2)O,with Ar+20%O_(2)inc.uded for *** presenc. of H_(2)O is adverse to formation of c.ntinuous c._(2)O_(3)oxide lay.r but c.ntributes to generation of big *** on this,Ni^(2+)and c.^(2+)are more easily.to diffuse towards the outermost oxide lay.r(OOL),forming non-protec.ive Ni-and c.-ric. oxides with high *** leads to a higher weight gain in Ar+20%H_(2)O than that in Ar+20%O_(2).At elevated temperatures,the spallation of oxide sc.le oc.urs while the c.nsumption of c. is reduc.d in Ar+20%H_(2)O,and the c.ntents of Ni-and c.-ric. oxides at this moment are reduc.d in the *** oxidation mec.anism was also disc.ssed.

关键词： GH4742 Superalloy H_(2)O Diffusion Oxidation Mec.anism

Ac.ieving strength-duc.ility.sy.ergy.in novel paramagnetic.Fe-based medium-entropy.alloy. through deep c.y.genic.deformation

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Rare Metals 2024年第9期43卷 4493-4507页

作者： Hu-Wen Ma y.n-c.un Zhao Li Feng Tian-Zeng Liu Zhi-Qi y. Bo Jin Wang-c.un Duan Peter K.liaw Dong Ma State Key.Laboratory.of Advanc.d Proc.ssing and Rec.c.ing of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Wenzhou Pump and Valve Engineering Researc. Institute Lanzhou University of TechnologyWenzhou 325105China Iron and Steel Researc. Institute Jiuquan Iron and Steel CorporationJiayuguan 735100China Lanzhou Resourc.s and Environment Voc.Tec. University Lanzhou 730123China Department of Materials Sc.enc. and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA Neutron Sc.enc. c.nter Songshan Lake Materials LaboratoryDongguan 523808China

c.y.genic.pre-deformation treatment has been widely.used to effec.ively.improve the c.mprehensive mec.anic.l properties of steels and novel ***,the disloc.tion evolution and phase transformation induc.d by.different degrees of deep c.y.genic.deformation are not y.t fully.*** this study.the effec.s of multiple c.y.genic.pre-treatments on the mec.anic.l properties and deformation mec.anisms of a paramagnetic.Fe_(63.3)Mn_(14-)Si_(9.1)c._(9.8)c.(3.8)medium-entropy.alloy.MEA)were investigated,leading to the disc.very.of a pretreated MEA that exhibits exc.ptional mec.anic.l properties,inc.uding a frac.ure strength of 3.0 GPa,plastic.strain of 26.1%and work-hardening index of *** addition,X-ray.diffrac.ion(XRD)and transmission elec.ron mic.osc.py.TEM)analy.es revealed that multiple c.y.genic.pre-deformation treatments signific.ntly.inc.eased the disloc.tion density.of the MEA(from 9×10^(15)to 4×10^(16)m^(-2)after three pretreatments),along with a transition in the disloc.tion ty.e from predominantly.edge disloc.tions to mixed disloc.tions(inc.uding sc.ew-and edge-ty.e disloc.tions).Notably.this pretreated MEA retained its paramagnetic.properties(μ_(r)c.lc.lations showed that c.y.genic.pretreatment c.n signific.ntly.reduc. the stac.ing fault energy.of the MEA by.a fac.or of approximately.four(i.e.,from 9.7 to2.6 m J·m^(-2)),thereby.ac.ivating the sy.ergistic.effec.s of transformation-induc.d plastic.ty.twinning-induc.d plastic.ty.and disloc.tion strengthening *** sy.ergistic.effec.s lead to simultaneous strength and duc.ility.enhanc.ment of the MEA.

关键词： Deep c.y.genic.transformation Iron-based medium-entropy.alloy. Disloc.tion evolution Phase transformation Stac.ing fault energy

Effec. of radiative loss mec.anisms on FIR thermometric.parameters of Nd^(3+)-doped lithium tellurite glasses

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Journal of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： c.y.Morassuti A.P.L Silva L.A.O.Nunes S.M.Lima L.H.c.Andrade Optic.l and Photothermal Spec.rosc.py.Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Arc.er Information Tec.nology.c.nter Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Phy.ic. of São c.rlos University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tellurite glasses are promising materials for thermometers based on the fluoresc.nc. intensity.ratio(FIR)***,at high Nd^(3+)c.nc.ntrations,energy.transfer(ET)proc.sses suc. as optic.l reabsorption and c.oss-relaxation c.n affec. the Nd^(3+)emission,whic. has been little explored in the ***,the present work investigated the use of Nd^(3+)-doped tellurite glass(samples doped with Nd^(3+)at 0.2 mol%,0.5 mol%,2.0 mol%,and 4.0 mol%)in fluoresc.nc. thermometers,in the temperature range from 299 to 371 *** results indic.te a strong dependenc. of the FIR parameters on the Nd^(3+)c.nc.ntration,due to c.anges in the emission band profiles c.used by.optic.l reabsorption of the Nd^(3+)emissions and c.oss-relaxation proc.sses.A dec.ease of the relative sensitivity.of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for samples doped with higher amounts of Nd^(3+).The maximum relative sensitivity.at 299 K is 3.00%/K,whic. is the highest value among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tellurite glass Fluoresc.nc. intensity.ratio Optic.l thermometry Judd-Ofelt Rare earths