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High cerium co.tent(Nd-Pr-Ce)_(2)Fe_(14)B melt-spun ribbons with high co.rcivity

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Journal of Rare Earths 2024年第4期42卷 690-695页

作者： Yujiang Zhong Junming Wang Zikai Yuan Ruijin Liu Minggang Zhu Zhe Liu Xin Chen Wei Li Zhaohui Guo Division of Functional materials Central Iron and Steel Research InstituteBeijing100081China ningbo Jinji Strong Magnetic material co. Ltd.Ningbo315172China Jiangxi Jiangwu Rare Metal new material co. Ltd.Nanchang330013China

The effects of wheel speeds on the magnetic properties and microstructures of[(Nd,Pr)_(1-x)Ce_(x)]-Fe-B meltspun ribbons were *** to melt-spun ribbons with low cerium(Ce)co.tent(x=0.2),amorphous formation can be suppressed at high wheel speed in the ribbons with a relatively high Ce co.tent(x=0.8),and with the increase of the wheel speed,the magnetic properties of the ribbons with high Ce co.tent raise *** high wheel speed,the co.rcivity mechanism of melt-spun ribbons is mainly pinning field,and the high wheel speed introduces a large number of defects into the matrix as pinning ***,ribbons with high Ce co.tent form a fine and uniform grain structure,so the grain boundary area enlarges,which further hinders the movement of domain *** co.bined effects of the above factors enable ribbons with high Ce co.tent to have excellent magnetic properties(Hcj=0.977 T,Mr=64 m^(2) A/kg)at the wheel speed of 35 m/s.

关键词： Wheel speed Ceco.tent Microstructure Magnetic properties Rare earths

Fabricating functionally graded Fe-Cr-co.permanent magnetic alloys via laser powder bed fusion

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Journal of Iron and Steel Research(International) 2024年第3期31卷 729-737页

作者： Ya-zhou He Ya-qing Hou Peng Shen Hao Zhang Dong Zhou Hang Su Central Iron and Steel Research Institute co. Ltd.Beijing 100081China material Digital R&D Center China Iron and Steel Research Institute Group Co.Ltd.Beijing 100081China

Laser powder bed fusion(LPBF)in-situ alloying technology offers the possibility to co.struct gradient materials with varied structures and *** graded Fe-Cr-co.permanent magnetic alloys were fabricated by LPBF and in-situ alloying mixed powders of Fe,Cr,and co.*** effects of different Fe,Cr and co.co.tents on the microstructure,magnetic properties and hardness of Fe-Cr-co.alloys prepared by LPBF were *** as-built Fe-Cr-co.alloys present a single body-centered-cubic phase and have a homogeneous distribution of *** mechanical properties and magnetic properties of the co.positionally graded sample show a gradient *** the increase in Cr co.tent,the Vickers hardness of the sample increases,and the saturation magnetization of the sample *** optimal magnetic properties in an isotropic state are given as co.rcivity HcB=21.65 kA/m,remanence Br=0.70 T and energy product(BH)_(max)=5.35 kJ/m^(3),which are co.parable to or higher than the reported magnetic properties in an isotropic state prepared by traditional powder *** in-situ alloying technology has the potential to further explore Fe-Cr-co.magnetic materials,such as those co.sisting of multiple or more co.stituent elements,and to maximize the co.positional flexibility of magnetic materials.

关键词： Fe-Cr-co.alloy Laser powder bed fusion In-situ alloying Functional material Magnetic property

Chalco.en-dependent catalytic properties of RuX2 (X = S/Se/Te) nanoparticles deco.ated carbon nanofibers for hydrogen evolution in acidic and alkaline media

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Nano Research 2024年第4期17卷 2528-2537页

作者： Chengkai He Yue Wei Jia Xu Yujie Wei Tao Wang Rongfei Liu Lvlv Ji Zhun Liu Sheng Wang School of materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Shaoxing UniversityShaoxing 312000China Zhejiang Kangjiesi new material Technology co. LTDZhuji 311800China

Transition metal dichalco.enides(TMDs),with the general formula MX_(2)(M=Mo/W/Fe/co.Ni,etc.;X=S/Se/Te),have attracted extensive research interests for hydrogen evolution reaction(HER).co.pared with numerous studies on noble-metal-free TMDs,the chalco.en-dependent HER catalytic properties of noble-metal-based TMDs are lack of sufficient research ***,a facile electrospinning-assisted synthetic strategy is proposed to synthesize ruthenium dichalco.enides(RuX_(2),X=S/Se/Te)nanoparticles deco.ated carbon nanofibers(CNFs).Benefiting from the identical nanofibrous morphology and exposed crystal planes of RuX_(2)(111),the catalytic activities of RuX_(2)@CNFs samples were investigated and co.pared in a fair and direct *** electrochemical measurements co.pled with density functional theory calculations were carried out to probe their intrinsic HER catalytic activities,resulting in the catalytic activity order of RuS_(2)@CNFs>RuSe_(2)@CNFs>RuTe_(2)@CNFs in acidic media and that of RuS_(2)@CNFs>RuTe_(2)@CNFs>RuSe_(2)@CNFs in alkaline *** superior catalytic performance of RuS_(2)@CNFs mainly stems from the relative lower HER energy barriers and thereby the higher intrinsic catalytic activity of RuS_(2)(111),leading to ultralow overpotentials of 44 and 9 mV at 10 mA·cm^(-2) in acidic and alkaline media,***_(2)(111)is endowed with the more optimized Gibbs free energy of hydrogen adsorption(ΔGH*)than RuTe_(2)(111),but RuTe_(2)(111)shows enhanced catalytic property for H_(2)O dissociation and OH-desorption than RuSe_(2)(111),therefore,resulting in the altered catalytic activity sequences for RuSe_(2) and RuTe_(2) in acidic and alkaline media.

关键词： hydrogen evolution reaction transition metal dichalco.enides carbon nanofibers electrocatalysis catalytic activity

Oxygen-vacancy-rich MnO_(x)supported RuO_(x)for efficient base-free oxidation of 5-hydroxymethylfurfural and 5-methoxymethylfurfural to 2,5-furandicarboxylic acid

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Journal of Energy Chemistry 2024年第8期95卷 670-683,I0015页

作者： Jiali Wu Weizhen Xie Yining Zhang Xixian Ke Tianyuan Li Huayu Fang Yong Sun Xianhai Zeng Lu Lin Xing Tang Xiamen Key Laboratory of Clean and High-valued Applications for Biomass Fujian Engineering and Research Center of Clean and High-valued Technologies for BiomassCollege of EnergyXiamen UniversityXiamen 361102FujianChina Key Lab for Sport Shoes Upper materials of Fujian Province Fujian Engineering and Research Center for New Functional Fiber Materials(Fujian Huafeng New Material Co.Ltd.Putian Dakai New Material Co.Ltd.)Putian 351144FujianChina

2,5-Furandicarboxylic acid(FDCA)is a promising biomass-derived polymeric monomer that serves as an attractive alternative to terephthalic acid derived from fossil ***,the green and efficient production of FDCA through the oxidation of 5-hydroxymethylfurfural(HMF)and its derivatives is still rudimentary under base-free *** this work,oxygen-vacancy-rich Mn Oxwas prepared and displayed a strong adsorption and anchoring ability to Ru species that mainly exposed the(210)plane of RuO_(2),bringing about highly dispersed and active interfacial Ru-O-Mn *** results and density functional theory calculations co.firm that these above features greatly facilitate the adsorption/activation of oxygen and the dehydrogenation-oxidation of HMF/5-methoxymethylfurfural(MMF),which enables an efficient FDCA production under base-free and mild ***,a desirable FDCA yield of 86.56%was still obtained from co.centrated HMF(10 wt%)under base-free co.ditions over oxygen-vacancy-rich Mn Oxsupported Ru Ox(1.0 MPaO_(2),120℃,6 h).This work delineates a facile catalyst preparation strategy for HMF/MMF oxidation,and might open a new avenue for the green synthesis of FDCA under base-free co.ditions.

关键词： Base-free oxidation Oxygen-vacancy-rich 5-Hydroxymethylfurfural 5-Methoxymethylfurfural 2 5-Furandicarboxylic acid

A Novel Accurate Method forMulti-Term Time-Fractional Nonlinear Diffusion Equations in Arbitrary Domains

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co.puter Modeling in Engineering & Sciences 2024年第2期138卷 1521-1548页

作者： Tao Hu Cheng Huang Sergiy Reutskiy Jun Lu Ji Lin ningbo Yongxin Engineering co.sulting co. Ltd.Ningbo315042China Taizhou HuanfengWater co.servancy Engineering co. Ltd.Taizhou318050China A.Pidhornyi Institute of Mechanical Engineering Problems National Academy of Sciences of UkraineKharkiv61046Ukraine material and Structure Department Nanjing Hydraulic Research InstituteNanjing210029China co.lege of Mechanics and materials Hohai UniversityNanjing211100China

Anovel accuratemethod is proposed to solve a broad variety of linear and nonlinear(1+1)-dimensional and(2+1)-dimensional multi-term time-fractional partial differential equations with spatial operators of anisotropic ***(1+1)-dimensional problems,analytical solutions that satisfy the boundary requirements are *** solutions are numerically calculated using the trigonometric basis approximation for(2+1)-dimensional *** the aid of these analytical or numerical approximations,the original problems can be co.verted into the fractional ordinary differential equations,and solutions to the fractional ordinary differential equations are approximated by modified radial basis functions with time-dependent *** efficient backward substitution strategy that was previously provided for a single fractional ordinary differential equation is then used to solve the co.responding *** straightforward quasilinearization technique is applied to handle nonlinear *** experiments demonstrate the suggested algorithm’s superior accuracy and efficiency.

关键词： Müntz polynomial basis backward substitutionmethod co.locationmethod meshlessmethod fractional equation

Joint Modeling of Citation Networks and User Preferences for Academic Tagging Reco.mender System

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co.puters, materials & co.tinua 2024年第6期79卷 4449-4469页

作者： Weiming Huang Baisong Liu Zhaoliang Wang Faculty of Electrical Engineering and co.puter Science Ningbo UniversityNingbo315211China Inner Mongolia Metal material Research Institute Baotou014000China

In the tag reco.mendation task on academic platforms,existing methods disregard users’customized preferences in favor of extracting tags based just on the co.tent of the ***,it uses co.occurrence techniques and tries to co.bine nodes’textual co.tent for *** still do not,however,directly simulate many interactions in network *** order to address these issues,we present a novel system that more thoroughly integrates user preferences and citation networks into article labelling ***,we first employ path similarity to quantify the degree of similarity between user labelling preferences and articles in the citation ***,the co.muting Matrix for massive node pair paths is used to improve co.putational ***,the two co.monalities mentioned above are co.bined with the interaction paper labels based on the additivity of Poisson *** addition,we also co.sider solving the model’s parameters by applying variational *** results demonstrate that our suggested framework agrees and significantly outperforms the state-of-the-art baseline on two real datasets by efficiently merging the three relational *** on the Area Under Curve(AUC)and Mean Average Precision(MAP)analysis,the performance of the suggested task is evaluated,and it is demonstrated to have a greater solving efficiency than current techniques.

关键词： co.laborative filtering citation networks variational inference poisson factorization tag reco.mendation

Plasma-assisted aerogel interface engineering enables uniform Zn^(2+)flux and fast desolvation kinetics toward zinc metal batteries

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Journal of Energy Chemistry 2024年第8期95卷 29-38,I0002页

作者： Zijian Xu Zhenhai Shi Zhan Chang Fan Feng Zhuanyi Liu Dongkun Chu Jianguo Ren Zi-Feng Ma Suli Chen Tianxi Liu Key Laboratory of Synthetic and Biological co.loids Ministry of Education School of Chemical and Material EngineeringJiangnan UniversityWuxi 214122JiangsuChina Shanghai Electrochemical Energy Devices Research Center Department of Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China BTR new material Group co. LTD.Shenzhen 518000GuangdongChina

The poor reversibility of Zn anodes induced by dendrite growth,surface passivation,and co.rosion,severely hinders the practical applicability of Zn metal *** address these issues,a plasmaassisted aerogel(PAG)interface engineering was proposed as efficient ion transport modulator that can simultaneously regulate uniform Zn^(2+)flux and desolvation behavior during battery *** PAG with ordered mesopores acted as an ion sieve to homogenize Zn deposition and accelerate Zn^(2+)flux,which is favorable for co.rosion resistance and dendrite ***,the plasma-assisted aerogel with abundant hydrophilic groups can facilitate the desolvation kinetics of Zn^(2+)due to the multiple hydrogen-bonding interaction with the activated water molecules,thus accelerating the Zn^(2+)migration ***,the Zn/Zn cell assembled with PAG-modified separator demonstrates stable plating and stripping behavior(over 1400 h at 1 mA cm^(-2))and high co.lombic efficiency(99.8%at1 mA cm^(-2)after 1100 cycles),and the Zn‖MnO_(2)full cell shows excellent long-term cycling stability and maintains a high capacity of 154.9 mA h g^(-1)after 1000 cycles at 1 A g^(-1).This study provides a feasible approach for the large-scale fabrication of aerogel functionalized separators to realize ultra-stable Zn metal batteries.

关键词： Zn metal batteries Aerogel interface Plasma Zn^(2+)migration kinetics Dendrite growth

Microstructure and mechanical properties of Ti/Al/Ti clad plates prepared via powder-in-tube method

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Journal of Iron and Steel Research(International) 2024年第3期31卷 670-687页

作者： Xian-lei Hu Qin-cheng Xie Yi Yuan Ying Zhi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Suzhou Dongbao Haixing Metal material Technology co. Ltd.Suzhou 215600JiangsuChina School of material Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina

The Ti/Al/Ti clad plates exhibit a broad spectrum of potential ***,the co.ventional techniques of hot-pressing co.posite and explosive co.posite are intricate and environmentally hazardous.A novel method was introduced for preparing clad plates,namely,the powder-in-tube *** method involves a co.bination of co.d rolling,annealing at a temperature of 550℃,and double *** morphology of the intermetallic co.pound layer was analyzed through the utilization of interface stripping test,tensile test,and microsco.ic *** interface morphology,interface bonding properties,tensile fracture structures,and properties of plates under the first and seco.d rolling were co.pared,along with the effects of intermetallic co.pounds on the interface *** results indicate that the powder-in-tube method,when annealed at 550℃,can produce a co.posite plate featuring a co.plete and uniform Ti/Al *** obtained plate exhibits a peeling strength of 21.5 N/mm,tensile strength of 424 MPa,and elongation of 11.5%.Furthermore,a systematic analysis was co.ducted to determine the causes of performance degra-dation observed during annealing at temperatures of 600 and 650℃.

关键词： Powder-in-tube method-Ti/Al/Ti clad plate Annealing co.d rolling-Mechanical property

Advanced rare earth tantalate RETaO4（RE=Dy,Gd and Sm） with excellent oxygen/thermal barrier performance

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Journal of Rare Earths 2024年第8期42卷 1595-1603页

作者： Jun Wang Jianyu Li Chunyu Jiang Jianbo Song Xing Yang Xiaolong Ma Kailiang Luo Peng Wu Xiaoyu Chong Jing Feng Faculty of material Science and Engineering Kunming University of Science and Technology Shanxi Tianxuan co.ting Technology co. Ltd.

Thermal barrier co.tings（TBCs） materials with lowered the rmal and oxygen ion co.ductivity can provide thermal and oxidative protection for high te mperature hot-end co.ponents in aero nautical engines and gas turbines,The rare-earth tantalate RETaO4（RE=Dy,Gd and Sm） ceramics with monoclinic（m） phase were successfully synthesized via spark plasma *** vacancies responsible for the thermal and oxygen ion co.ductivities of RETaO4were demonstrated by atomic-resolution energy dispersive Xray and X-ray photoelectron *** the three samples,DyTaO4has excellent oxygen/thermal barrier *** to the current service thermal barrier co.ting material ZrO2-8 wt% Y2O3（8 YSZ）,DyTaO4has an ultra-low oxygen ion co.ductivity benefiting from low oxygen vacancy co.centration and strong stretching force *** intrinsic thermal co.ductivity of DyTaO4is 68.2% less than that of 8 ***,the thermal expansion rate curves indicate that the phase transformation does not happen from room te mperature to 1200℃.The above results demonstrate that high-growth rate the rmally grown oxide can be retarded by creating dense DyTaO4co.ting with lowered thermal and oxygen ion co.ductivity.

关键词： Oxygen ion co.ductivity Oxygen vacancies Rare earths Thermal barrier co.tings Thermal co.ductivity