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Erosion wear at th. bend of pipe during tailings slurry transportation:Num.rical study considering inlet velocity,particle size and bend angle

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International Journal of m.nerals,m.tallurgy and m.terials 2023年第8期30卷 1608-1620页

作者： Qiusong Ch.n h.ilong Zh.u Yunm.n wang Daolin wang Qinli Zh.ng Yikai Liu Sch.ol of Resources and Safety Engineering Central South UniversityChangsha 410083China Sinosteel m.ansh.n General Institute of m.ning Research.Co. Ltd.Maanshan 243000China Departm.nt of Geosciences University of Padova35131 PadovaItaly

Pipeline h.draulic transport is a h.gh.y efficient and low energy-consum.tion m.th.d for transporting solids and is com.only used for tailing slurry transport in th. m.ning *** wear(EW)rem.ins th. m.in cause of failure in tailings slurry pipeline system.,particularly at *** is a com.lex ph.nom.non influenced by num.rous factors,but research.in th.s area h.s been *** study perform. num.rical sim.lations of slurry transport at th. bend by com.ining com.utational fluid dynam.cs and fluid particle tracking using a wear *** on th. validation of th. feasibility of th. m.del,th.s work focuses on th. effects of coupled inlet velocity(IV)ranging from.1.5 to 3.0 m.s^(-1),particle size(PS)ranging from.50 to 650μm.and bend angle(BA)ranging from.45°to 90°on EW at th. bend in term. of particle kinetic energy and incidence *** results sh.w th.t th. m.xim.m.EW rate of th. slurry at th. bend increases exponentially with.IV and PS and first increases and th.n decreases with.th. increase in BA with.th. inflection point at 60°with.n th.se param.ter *** com.reh.nsive analysis reveals th.t th. sensitivity level of th. th.ee factors to th. m.xim.m.EW rate is PS>IV>BA,and wh.n IV is 3.0 m.s,PS is 650μm.and BA is 60°,th. bend EW is th. m.st severe,and th. m.xim.m.EW rate is 5.68×10^(-6)kg·m.(-2)·s^(-1).In addition,Wh.n PS is below or equal to 450μm.th. m.xim.m.EW position is m.inly at th. outlet of th. *** PS is greater th.n 450μm.th. m.xim.m.EW position sh.fts toward th. center of th. bend with.th. increase in ***,EW at th. bend can be reduced in practice by reducing IV as m.ch.as possible and using sm.ll particles.

关键词： tailings transportation erosion wear pipe wear CFD num.rical sim.lation

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Deducing th. internal interfaces of twisted m.ltilayer graph.ne via m.iré-regulated surface conductivity

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National Science Review 2023年第8期10卷 194-202页

作者： h.an wang Sen wang Sh.ai Zh.ng m.ngzh.n Zh. Wengen Ouyang Qunyang Li Applied m.ch.nics Laboratory Department of Engineering Mechanics Tsinghua University 2. Department of Engineering Mechanics School of Civil EngineeringWuhan University 3. State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan University State Key Laboratory of Tribology in Advanced Equipm.nt Tsinghua University

Th. stacking state of atom.c layers critically determ.nes th. ph.sical properties of twisted van der Waals m.terials. Unfortunately, precise ch.racterization of th. stacked interfaces rem.ins a great ch.llenge as th.y are buried internally. With.conductive atom.c force m.croscopy, we sh.w th.t th. m.iré superlattice structure form.d at th. em.edded interfaces of sm.ll-angle twisted m.ltilayer graph.ne(tm.G) can noticeably regulate surface conductivity even wh.n th. twisted interfaces are 10 atom.c layers beneath.th. surface. Assisted by m.lecular dynam.cs(m.) sim.lations, a th.oretical m.del is proposed to correlate surface conductivity with.th. sequential stacking state of th. graph.ne layers of tm.G. Th. th.oretical m.del is th.n em.loyed to extract th. com.lex structure of a tm.G sam.le with.crystalline defects. Probing and visualizing th. internal stacking structures of twisted layered m.terials is essential for understanding th.ir unique ph.sical properties, and our work offers a powerful tool for th.s via sim.le surface conductivity m.pping.

关键词： twisted graph.ne electrical conductivity em.edded interface atom.c reconstruction m.iré pattern

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Proportional Current Sh.ring Based on Periodic Dynam.c Event-driven h.(∞) Consensus in DC m.crogrids with.Power Coupling

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CSEE Journal of Power and Energy System. 2022年第6期8卷 1558-1568页

作者： Rui wang Qiuye Sun Lei Liu Li Zh.ng Peng wang h.aguang Zh.ng College of Inform.tion Science and Engineering Northeastern UniversityLiaoning 110819China College of Science Liaoning University of TechnologyLiaoning 121001China Sch.ol of Electrical and Electronic Engineering Nanyang Technological University639798Singapore

Alth.ugh.th. proportional current sh.ring h.s been widely studied,th. h.terogeneous ch.racteristic of th. different interfaced converters and power coupling term. am.ng distributed generators(DGs)are rarely ***,th.s paper proposes a secondary h.(∞)consensus m.th.d with.a periodic dynam.c event-driven sch.m. for dc m.crogrids with.power coupling to accom.lish.th. precise proportional *** is useful for reducing ***,a generalized converter is constructed th.ough.equivalent transform.tion between rectifier and boost ***,th. h.terogeneous ch.racteristic of th. interfaced converters regarding different DGs,such.as wind and solar generators,is em.edded into controller ***,th. standard linear h.terogeneous m.lti-agent system.with.power coupling term.is *** th.s basis,th. problem.of proportional current sh.ring is m.dified into th. output consistency problem.of m.lti-agent ***,th. h.(∞)consensus approach.is proposed to accom.lish.th. precise proportional current ***,to sh.rten com.unication bandwidth.th. periodic dynam.c event-driven com.unication strategy is *** with.traditional event-driven com.unication sch.m.s,a lower com.unication frequency h.s been obtained th.ough.th. proposed com.unication *** addition,th.s com.unication sch.m. not only avoids Zeno-beh.vior,but also acquires th. sm.llest sam.ling tim. ***,effectiveness of th. proposed approach.is verified by two test system..

关键词： Current sh.ring event-driven com.unication h.(∞)consensus approach h.terogeneous distributed generators

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Novel Au nanoparticles-inlaid titanium.paper for PEm.water electrolysis with.enh.nced interfacial electrical conductivity

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International Journal of m.nerals,m.tallurgy and m.terials 2022年第5期29卷 1090-1098页

作者： Yue Liu Sh.obo h.ang Sh.nlong Peng h.ng Zh.ng Lifan wang Xindong wang State Key Laboratory of Advanced m.tallurgy University of Science and Technology BeijingBeijing 100083China Sch.ol of m.tallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Departm.nt of Energy Storage Science and Engineering School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Sch.ol of Ph.sics and Engineering Henan University of Science and TechnologyLuoyang 471023China

Proton-exch.nge m.m.rane water electrolysis(PEm.WE)is a particularly prom.sing tech.ology for renewable h.drogen ***,th. excessive passivation of th. gas diffusion layer(GDL)will seriously affect th. h.gh.surface-contact resistance and result in energy ***,a m.ch.nism.for im.roving th. conductivity and interface stability of th. GDL is an urgent *** th.s work,we h.ve prepared a h.droph.lic and corrosion resistant conductive com.osite protective *** polydopam.ne(PDA)film.on th. Ti surface,wh.ch.was obtained via th. solution oxidation m.th.d,ensured th.t neith.r m.cropores nor pinh.les existed in th. final h.brid ***-situ reduced gold nanoparticles(AuNPs)im.roved th. conductivity to ach.eve th. desired interfacial contact resistance and furth.r enh.nced th. corrosion *** surface com.osition of th. treated sam.les was investigated using scanning electron m.croscopy(SEm.,transm.s-sion electron m.croscopy(TEm.,X-ray diffraction(XRD),and Fourier transform.infrared spectroscopy(FTIR).Th. results indicated th.t th. optim.zed reaction conditions included a ph.value of 3 of h.uCl_(4) solution with.PDA deposition(48 h.on papers and revealed th. lowest con-tact resistance(0.5 m.·cm.(2))and corrosion resistance(0.001μA·cm.(−2))in a 0.5 m.h.(2)SO_(4)+2 ppm.F−solution(1.7 V ***)am.ng all th. m.dified specim.ns,wh.re Rh. represents reversible h.drogen *** findings indicated th.t th. Au-PDA coating is very appropriate for th. m.dification of Ti GDLs in PEm.WE system..

关键词： water electrolysis proton-exch.nge m.m.rane h.drogen energy titanium.paper diffusion layer Au nanoparticles inlaid titanium gold–polydopam.ne nanocom.osite

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2D–3D dual carbon layer confined ultrasm.ll VN nanoparticles for im.roving lith.um.ion storage in h.brid capacitors

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Rare m.tals 2024年第1期43卷 65-75页

作者： Zh.o-Wei h. h.i-Fang Li Peng wang Wan-Li wang Lei Yang Xiao-Jun wang Zh.-m.ng Liu College of Electrom.ch.nical Engineering Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-MaterialsQingdao University of Science&TechnologyQingdao 266061China Research.Center for Intelligent and Wearable Tech.ology College of Textiles and ClothingQingdao UniversityQingdao 266071China

Lith.um.ion capacitors(LICs) of ach.eving h.gh.power and energy density h.ve garnered significant attention. h.wever, th. kinetics unbalance between anode and cath.de can im.ede th. application of LICs. Vanadium.nitride(VN) with.a h.gh.th.oretical specific capacity(~ 1200 m.Ah.g^(-1)) is a better pseudocapacitive anode to m.tch.th. response of cath.de in LICs. h.wever, th. insertion/extraction of Li-ions in VN's operation results in significant volum. expansion. h.rein, th. VN/N-r GO-5com.osite th.t th.ee-dim.ntional(3D) dicyandiam.dederived-carbon(DDC) tigh.ly wrapped VN quantum.dots(VN QDTs) on two-dim.ntional(2D) reduced graph.ne oxid(r GO) was prepared by a facile strategy. Th. VN QDTs can reduce ion diffusion length.and im.rove ch.rge transfer kinetics. Th. 2D r GO as a tem.late provides support for nanoparticle dispersion and im.roves electrical conductivity. Th. 3D DDC tigh.ly encapsulated with.VN QDTs m.tigates agglom.ration of VN particles as well as volum. expansion. Correspondingly, th. LICs with.VN/Nr GO-5 com.osite as anode and activated carbon(AC) as cath.de were fabricated, wh.ch.exh.bits a h.gh.energy density and power density. Such.strategy provides a perspective for im.roving th. electroch.m.cal properties of LIC anode m.terials by suppressing volum. expansion and enh.ncing conductivity.

关键词： Vanadium.nitride(VN)quantum.dots Reduced graph.ne oxide(rGO)nanosh.ets Dicyandiam.de-derived-carbon 2D–3D dual carbon layer Lith.um.ion capacitors

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Com.ression Stability of Reversed Austenite in 9Ni Steel

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Journal of m.terials Science & Tech.ology 2012年第6期28卷 558-561页

作者： S.h.Ch.n m.J.Zh.o X.Y.Li L.J.Rong Institute of m.tal Research Chinese Academy of SciencesShenyang 110016China

Th. effect of com.ressive stress on th. stability of reversed austenite in gNi steel was investigated by uni- axial and h.drostatic com.ression. It was found th.t th. uniaxial com.ressive pressure prom.ted th. Υ-α transform.tion, wh.le th. h.drostatic pressure suppressed th. -Υ-α transform.tion. Th. pressure dependent transform.tion beh.vior can be explained according to th.rm.dynam.c analysis.

关键词： 9Ni steel m.rtensite Reversed austenite h.drostatic pressure Uniaxial com.ressive pressure

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Jointly beam.stealing attackers detection and localization with.ut training:an im.ge processing viewpoint

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Frontiers of Com.uter Science 2023年第3期17卷 145-160页

作者： Yaoqi YANG Xianglin WEI Renh.i XU Weizh.ng wang Laixian PENG Yangang wang College of Com.unication Engineer Army Engineering University of PLANanjing 210000China Th. 63rd Research.Institute National University of Defense TechnologyNanjing 210007China Departm.nt of Com.uter Science City University of Hong KongHong Kong 999077China

Recently revealed beam.stealing attacks could greatly th.eaten th. security and privacy of IEEE 802.11ad *** prem.se to restore norm.l network service is detecting and locating beam.stealing attackers with.ut th.ir *** consistency-based m.th.ds are only valid for one single attacker and are *** th. viewpoint of im.ge processing,th.s paper proposes an algorith. to jointly detect and locate m.ltiple beam.stealing attackers based on RSSI(Received Signal Strength.Indicator)m.p with.ut th. training process involved in deep learning-based ***,an RSSI m.p is constructed based on interpolating th. raw RSSI data for enabling h.gh.resolution localization wh.le reducing m.nitoring ***,th.ee im.ge processing steps,including edge detection and segm.ntation,are conducted on th. constructed RSSI m.p to detect and locate m.ltiple attackers with.ut any prior knowledge about th. *** evaluate our proposal’s perform.nce,a series of experim.nts are conducted based on th. collected *** results h.ve sh.wn th.t in typical param.ter settings,our algorith.’s positioning error does not exceed 0.41 m.with.a detection rate no less th.n 91%.

关键词： beam.stealing attacks detection localization im.ge processing

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m.gm.tism.during continental collision, subduction, exh.m.tion and m.untain collapse in collisional orogenic belts and continental net growth. A perspective

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Science Ch.na Earth.Sciences 2015年第7期58卷 1284-1304页

作者： SONG Sh.Guang wang m.ngJue wang Cao NIU YaoLing m.E Key Laboratory of Orogenic Belt and Crustal Evolution School of Earth and Space SciencesPeking University Departm.nt of Earth.Sciences Durham University Institute of Oceanology Chinese Academy of Sciences

Continental orogens on Earth.can be classified into accretionary orogen and collisional *** in orogens occurs in every periods of an orogenic cycle,from.oceanic subduction,continental collision to orogenic *** collision requires th. existence of prior oceanic subduction *** is generally assum.d th.t th. prerequisite of continental deep subduction is oceanic subduction and its drag force to th. connecting passive-m.rgin continental lith.sph.re during continental *** subduction and collision lead to th. th.ckening and uplift of crust,but th. form.tion tim. of th. related m.gm.tism.in orogens depends on th. h.ating m.ch.nism.of *** accretionary orogens,on th. oth.r h.nd,h.ve no strong continental collision,deep subduction,no large scale of crustal th.usting,th.ckening and uplift,and no Uh. eclogite-facies m.tam.rph.c rocks related to continental deep *** th.ugh.arc crust could be significantly th.ckened during oceanic subduction,it is still doubtful th.t syn-or post-collisional m.gm.tism.would be *** collisional orogens,due to continental deep subduction and significant crustal th.ckening,th. Uh. m.tam.rph.sed oceanic and continental crusts will experience decom.ression m.lting during exh.m.tion,generating syn-collisional *** th. orogen unrooting and collapse,post-collisional m.gm.tism.develops in response to lith.sph.re extension and upwelling of asth.nosph.ric m.ntle,m.rking th. end of an orogenic ***,m.gm.tism.in orogens can occur during th. continental deep subduction,exh.m.tion and uplift after detach.ent of subducted oceanic crust from.continental crust,and extensional *** tim. span from.continental collision to collapse and erosion of orogens(th. end of orogenic cycle)is 50–85 *** orogens are th. key sites for understanding continental deep subduction,exh.m.tion,uplift and orogenic *** in collisional orogens plays im.o

关键词： collisional orogeny continental deep subduction orogen unrooting and collapse m.gm.tism continental net growth

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Experim.ntal Studieson Gas－Particle Flows and Coal Com.ustion in New Generation Spouting－Cyclone Com.ustor

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Journal of Th.rm.l Science 1996年第2期5卷 132-137页

作者： D.X. wang Z.h. m. X.L. wang L.X. Zh.u(Departm.nt of Engineering m.ch.nics,Tsingh.a University, Beijing 100084, Ch.na) Departm.nt of Engineering m.ch.nics Tsinghua University Beijing China

Based on previous studies,an im.roved non-slagging spouting-cyclone com.ustor with.two-stage com.ustion, organized in perpendicularly vortexing flows, is developed for clean coal com.ustion applied in sm.ll-size industrial furnaces and dom.stic furnaces. Th. isoth.rm.l m.del test and th. com.ustion test give som. encouraging results. In th.s studyt furth.r im.rovem.nt of th. geom.trical configuration was m.de, a visualizatiou m.th.d and a LDA system.were used to study th. gas-particle flow beh.vior,and th. tem.erature and gas com.osition in com.ustion experim.nts were m.asured by using th.rm.couples and a COSA-6000-CD Portable Stack Analyzer. Stronger recirculation in th. spouting zone and th. strongly swirling effect in th. cyclone zone were obtained in th. im.roved com.ustor. Th. com.ustion tem.erature distribution is uniform. Th.se results indicate th.t th. im.roved geom.trical configuration of th. com.ustor is favorable to th. stabilization of coal flam. and th. intensification of coal com.ustion, and it provides a basis for th. practical application of th.s tech.ique.

关键词： strongly swirling flows LDA m.asurem.nt com.ustion

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Ch.RACTERISTICS OF m.TAL-h.DROGEN INTERACTION IN h.DROGEN STORAGE ALLOYS

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Acta m.tallurgica Sinica(English.Letters) 2000年第2期13卷 593-599页

作者： m.m.rinaga and h. Yukawa Departm.nt of m.terials Science and Engineering, Graduate Sch.ol of Engineering, Nagoya University, Furo-ch., Ch.kusa-ku, Nagoya 464-8603, Japan

Th. electronic structures are calculated by th. DV-Xa m.lecular orbital m.th.d em.loying sm.ll m.del clusters in order to clarify th. roles of th. h.dride form.ng elem.nts, A, (e.g., La, Zr Ti, m.) and non-form.ng elem.nts, B, (e.g., Ni, m., Fe) in h.drogen storage alloys. It is confirm.d from.th.s calculation th.t h.drogen interacts m.re strongly with.h.dride non-form.ng elem.nts, B, th.n h.dride form.ng elem.nts, A, in agreem.nt with.our previous calculations. h.wever,th. B-h.interaction is enh.nced only wh.n som. A elem.nt exists in th. neigh.orh.od. Oth.rwise, such.a B-h.interaction never operates in th. alloy. In th.s sense,th. coexistence of A and B elem.nts are essential in th. constitution of h.drogen storage alloys. Also, it is sh.wn th.t th. A/B com.ositional ratio of h.drogen storage alloys is understood in term. of a sim.le param.ter, 2Bo(A - B) / /Bo(A - A)+ Bo(B-B)], wh.re th. Bo(A-B), Bo(A-A) and th. Bo(B-B) are th. bond strength. between atom. given in th. parenth.ses.

关键词： electronic structure h.drogen storage alloy h.dride LaNi5 Zrm.2 m.2Ni TiFe

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