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Reactive destabiliz.tion and bidirectional cataly.0}tion for reversible hy.rogen storage of LiBH_(4) by.novel waxberry.like nano-additive assembled from ultrafine Fe_(3)O_(4) particles

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Journal of Materials Science & Technology 2024年第6期173卷 63-71页

作者： S.Wang M.H.Wu y.y.zhu z.L.Li y.X.y.ng y.z.Li H.F.Liu M.X.Gao Department of Material Science Shenzhen MSU-BIT UniversityShenzhen 518172China State Key.Laboratory.of Silicon and Advanced Semiconductor Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Resources Utiliz.tion and Rare Earth Development State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Institute of Science and Technology.for New Energy Xi’an Technological UniversityXi’an 710021China National Supercomputing Center in Shenz.en Shenzhen 518055China

LiBH_(4) containing 18.5 wt.%H_(2) is an attractive high-capacity.hy.rogen storage material,however,it suffers from high operation temperature and poor ***,a novel and low-cost bifunctional additive,waxberry.like Fe_(3)O_(4) secondary.nanospheres assembled from ultrafine primary.Fe_(3)O_(4) nanoparticles,is sy.thesiz.d,which exhibits significant destabiliz.tion and bidirectional cataly.0}tion towards(de)hy.rogenation of LiBH_(4).With an optimiz.d addition of 30 wt.% waxberry.like Fe_(3)O_(4),the sy.tem initiated dehy.rogenation below 100℃ and released a total of 8.1 wt.%H_(2) to 400℃.After 10 cy.les,a capacity.retention of 70% was achieved,greatly.superior to previously.reported oxides-modified *** destabiliz.ng and cataly.0}ng mechanisms of waxberry.like Fe_(3)O_(4) on LiBH_(4) were sy.tematically.analy.0}d by.phase and microstructural evolutions during dehy.rogenation and hy.rogenation cy.ling as well as density.functional theory.DFT)*** present work provides new insights in developing advanced nano-additives with unique structural and multifunctional designs towards LiBH4 hy.rogen storage.

关键词： LiBH_(4) Hy.rogen storage Waxberry.like Fe_(3)O_(4) Destabiliz.tion Cataly.is

Numerical Study.of Flow Features Around Submerged Circular and Square Piles at Flat and Scoured Beds Using OpenFOAM

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Journal of Ocean University.of China 2024年第4期23卷 897-914页

作者： WANG Chaolin WU Guoxiang WANG Dianhe DU Shengtao z.ANG z.iy.ng JIN Heng zhu David z. LIANG Bingchen Donghai Academy School of Civil&Environmental Engineering and Geography ScienceNingbo UniversityNingbo 315211China Key.Laboratory.of Estuary.and Coast of z.ejiang Province and Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China Shandong Provincial Key.Laboratory.of Ocean Engineering and College of EngineeringOcean University of ChinaQingdao 266100China Shandong Water Conservancy.Vocational College Rizhao 276826China School of Mechanical and Energy.Engineering Ningbotech UniversityNingbo 315211China

Elucidating the flow features around piles in local scouring processes is crucial for studies of local scouring mechanisms and scour depth *** study.details the flow turbulence characteristics of two submerged piles that are determined by.solving the Navier-Stokes equations with the improved delay.d detached eddy.simulation *** model is verified by.comparing experimental and numerical results for hy.rody.amic parameters with the literature for both square-crossing piles(SCPs)and circular-crossing piles(CCPs).Original topographies of flat and scoured beds(i.e.,the initial and equilibrium scouring stages)are based on experimental results obtained by.the authors in the present *** and CCP flow features in the scouring process are *** results indicate that during the scouring process,the time-averaged drag coefficient and root mean square(rms)of the lift coefficient increase linearly.in the CCP test,while the rms of the lift coefficient in the SCP test decreases ***,the minimum pressure coefficient is alway. located in the upstream corners in the SCP case but moves from 72.5°to 79.5°when the scour hole is completely.developed in the CCP *** flow behind the pile,which is generated by.separated boundary.lay.rs above the top face of the pile,can reach the sand bed and turn the separated shear lay.rs into patches of small vortices in the near-wake ***,the high shear stress z.nes are mainly.at the scour edges under scoured-bed conditions.

关键词： flat bed scoured bed local scour OpenFOAM bed shear stress

Fast efficient photon deceleration in plasmas by.using two laser pulses at different frequencies

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Matter and Radiation at Extremes 2024年第3期9卷 11-18页

作者： y.X.Wang X.L.zhu S.M.Weng P.Li X.F.Li H.Ai H.R.Pan z.M.Sheng Key.Laboratory.for Laser Plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Research Center of Laser Fusion of China Academy.of Engineering Phy.ics MianyangSichuan 621900China State key.Laboratory.of High Field Laser Phy.ics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ultrashort high-power light sources in the mid-infrared(mid-IR)to terahertz.THz.range is of interest for applications in a number of fields,from fundamental research to biology.and *** conventional laser technology.photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-IR or THz.***,we present a photon deceleration scheme for the efficient generation of ultrashort mid-IR or THz.pulses by.using an intense driver laser pulse with a relatively.short wavelength and a signal laser pulse with a relatively.long *** signal pulse trails the driver pulse with an appropriate time delay.such that it sits at the front of the second wake bubble that is driven by.the driver *** to its relatively.long wavelength,the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake ***,the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer *** greatly.enhances the capacity.and efficiency.of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength IR and THz.spectral ranges.

关键词： laser ultrashort photon

Prediction of Asphalt Concrete Properties by.Fast Multipole Boundary.Element Method

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Prediction of Asphalt Concrete Properties by Fast Multipole ...

Decorating cry.talline y.e_(2-x)Al_(x) on the Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy.as “hy.rogen pump” to realiz. fast de/hy.rogenation

第三届亚太国际工程中计算方法学术会议ICOME2009暨第九届全国工程中边界元、无网格等数值方法学术会议

作者： X. y. zhu 1 *, z. y. Huang 1, W. Q. Chen 2 1 Department of Civil Engineering, z.ejiang University. z.jingang Campus, Hangz.ou 310058, China 2 Department of Engineering Mechanics, z.ejiang University. y.quan Campus, Hangz.ou 310058, China

Asphalt concrete (AC) is a ty.ical complex multi-phase composite. Different siz.s of the aggregates and mineral fillers in AC have long been recogniz.d to influence the overall performance of the asphalt pavement. Fast multipole boundary.element method (FMBEM), a new algorithm developed recently. is a particularly.suitable tool to investigate the mechanical response of composites with multi-inclusions such as the asphalt concrete. To predict the mechanical behavior of AC, this work describes a numerical study. in which the asphalt concrete samples are modeled with the FMBEM incorporating for random elliptical aggregates. The elliptical shaped aggregates are obtained by.simulating from the ty.ical original aggregate shapes of AC samples. To investigate the bonding properties at the aggregate-asphalt binder interface, the spring model is introduced to account for this kind of interface imperfection. It is assumed that the tractions are continuous across the interface while the displacements are allowed the jumps from fiber to matrix, and these jumps are proportional to the conjugate tractions transmitted across the interface. These proportionality.constants then characteriz. the stiffness of the interface. A methodology.for analy.0}ng the linear viscoelastic response of asphalt matrix using the FMBEM is also proposed by.the elastic-viscoelastic correspondence principle. The effects of interfacial bonding strength, aggregate volume ratio, stiffness of aggregates and asphalt binder as well as air voids on the macro-mechanical behavior of AC are investigated. Tests on asphalt concrete with various microstructures are conducted to verify.the proposed numerical method. It is shown that the proposed method is generally.in agreement with the experimental results.

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Journal of Materials Science & Technology 2024年第6期173卷 72-79页

作者： L.J.Huang H.Wang L.z.Ouy.ng M.zhu H.J.Lin School of Materials Science and Engineering Key Laboratory of Advanced Energy Storage Materials of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510641China Institute of Advanced Wear&Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou 510632China

Mg-based amorphous alloy. are one of the potential hy.rogen storage materials but suffer from sluggish dehy.rogenation/hy.rogenation(de/hy.rogenation)*** this work,as a new strategy.a hy.rogen pump is built on the surface of amorphous alloy. to solve this *** milling cry.talline y.e_(2-x)Al_(x) hy.rogen storage alloy.with Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy.fine cry.talline particles were seeded on amorphous alloy.powder to form a“strawberry.*** to the TEM observation,a metallurgical bonding boundary.formed between the Mg-based amorphous matrix and the y.Fe-Al cry.talline *** microstructure and de/hy.rogenation kinetics investigation,the“hy.rogen pump”effect of the seeded cry.talline alloy.was confirmed,which makes it much easier for the hy.rogen to dissociate on and diffuse through the surface of the Mg-based amorphous *** such effect,the H absorption rate of Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy.became almost eight times faster and it absorbs ~2.8 wt.% in 1 h at 130℃ under 4.5 MPa-H_(2).Further,fast hy.rogenation can even achieve at 70℃ and the low-temperature dehy.rogenation kinetics of the amorphous hy.ride can be also greatly.*** present work proves that surface modification is of great importance for obtaining Mg-based amorphous alloy.with ideal hy.rogen storage performance.

关键词： Hy.rogen storage Mg-based amorphous alloy Hy.rogen pump Composite structure

Electromagnetic Performance Analy.is of Variable Flux Memory.Machines with Series-magnetic-circuit and Different Rotor Topologies

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CES Transactions on Electrical Machines and Sy.tems 2024年第1期8卷 3-11页

作者： Qiang Wei z.Q.zhu y.n Jia Jianghua Feng Shuy.ng Guo y.feng Li Shouz.i Feng Department of Electronic and Electrical Engineering The University of SheffieldSheffield S13JDU.K. IEEE the CRRC zhuz.ou Institute Company.Ltd. Zhuzhou 412001China

In this paper,the electromagnetic performance of variable flux memory.VFM)machines with series-magnetic-circuit is investigated and compared for different rotor *** on a V-ty.e VFM machine,five topologies with different interior permanent magnet(IPM)arrangements are evolved and optimiz.d under same *** on two-dimensional(2-D)finite element(FE)method,their electromagnetic performance at magnetiz.tion and demagnetiz.tion states is *** reveals that the iron bridge and rotor lamination region between constant PM(CPM)and variable PM(VPM)play.an important role in torque density.and flux regulation(FR)***,the global efficiency.can be improved in VFM machines by.adjusting magnetiz.tion state(MS)under different operating conditions.

关键词： Memory.machine Permanent magnet Rotor topologies Series magnetic circuit Variable flux

Few-shot incremental radar target recognition framework based on scattering-topology.properties

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Chinese Journal of Aeronautics 2024年第8期37卷 246-260页

作者： Chenxuan LI Weigang zhu Bakun zhu y.nggang LI Graduate School Space Engineering UniversityBeijing 101400China Department of Electronic and Optical Engineering Space Engineering UniversityBeijing 101400China

The continuous emergence of new targets in open scenarios leads to a substantial decrease in the performance of Inverse Sy.thetic Aperture Radar(ISAR)recognition ***,data scarcity.further exacerbates the challenge of identify.ng new classes of ISAR *** this paper,a few-shot incremental target recognition framework based on Scattering-Topology.Properties(STPIL)is ***,STPIL extracts scattering-topology.properties of ISAR targets as recognition ***,the pseudo-incremental training strategy.effectively.alleviates the algorithm’s forgetting of old knowledge,and improves compatibility.with new ***,a feature embedding network,with few parameters,is designed based on the graph neural *** embedding network is highly.adaptable to changes in data ***,STPIL fully.considers the joint distribution and marginal distribution in scattering features,and uses the Brownian distance metric module to make the scattering-topology.features more *** results on both the simulation dataset and the public measured data indicate that STPIL can effectively.balance new classes with old classes,and has superior performance to other advanced methods in the incremental recognition of targets.

关键词： Brownian distance metric Graph neural networks Incremental learning Inverse Sy.thetic Aperture Radar(ISAR) Scattering

Stress-strain relationship for reactive powder concrete with recy.led powder under uniaxial compression

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1015-1027页

作者： Peng zhu y.nming zhu Wenjun QU Liy. XIE College of Civil Engineering Tongji UniversityShanghai 200092China Key.Laboratory.of Performance Evolution and Control for Engineering Structures of Ministry.of Education Tongji UniversityShanghai 200092China

The recy.led powder(RP)from construction wastes can be used to partially.replace cement in the preparation of reactive powder *** this paper,reactive powder concrete mixtures with RP partially.replacing cement,and natural sand instead of quartz.are *** curing is used,instead of steam curing that is normally.requested by.standard for reactive powder *** influences of RP replacement ratio(0%,10%,20%,30%),silica fume proportion(10%,15%,20%),and steel fiber proportion(0%,1%,2%)are *** effects of RP,silica fume,and steel fiber proportion on compressive strength,elastic modulus,and relative absorption energy.are analy.0}d,and theoretical models for compressive strength,elastic modulus,and relative absorption energy.are established.A constitutive model for the uniaxial compressive stress-strain relationship of reactive powder concrete with RP is *** the increase of RP replacement ratio from 0% to 30%,the compressive strength decreases by.42% and elastic modulus decreases by.24%.

关键词： recy.led powder reactive powder concrete elastic modulus relative absorbed energy stress-strain relationship

Introduction to the first Jeme Tien y.w Lecture

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Underground Space 2024年第5期18卷 1-2页

作者： Hehua zhu Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

The Jeme Tien y.w Lecture is in honor of *** Tien y.w(1861–1919),the pioneer of tunneling and underground space engineering in China and also renowned as the"Father of Modern Chinese Engineering".The lecture is hosted and organiz.d by.the journal of Underground ***-Min z.ang will deliver the first Jeme Tien y.w Lecture on May.26th,2024,at RM101,College of Civil Engineering,Tongji University.Shanghai,*** has submitted the corresponding research paper,coauthored with ***,for publication in the journal of Underground *** are delighted to see its publication together with this brief introduction.

关键词： journal underground Tie