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Journal of m.dern Power System. and Clean Energy 2024年第1期12卷 189-201页

作者： Zhao Shi yan Xu Dunjian Xie Shiwei Xie Am.r m.Y.m.Ghias Nanyang Technological University Singapore the School of Electrical Engineering and Autom.tion Fuzhou UniversityFuzhou 350108China

This paper proposes a new m.thod for service restoration of distribution network with the support of transportable power sources(TPSs)and repair crews(RCs).Firstly,a coupling m.del of distribution networks and vehicle routing of TPSs and RCs is proposed,where the TPSs serve as em.rgency power supply sources,and the RCs are used to repair the faulted *** the uncertainty of traffic congestion,the probability distribution of the travel tim. spent on each road is derived based on the Nesterov user equilibrium.m.del,and a two-stage stochastic program.is form.lated to determ.ne the optim.l routings of TPSs and *** efficiently solve the proposed stochastic m.xed-integer linear program.m.LP),a two-phase scenario reduction m.thod is then developed to scale down the problem.size,and an adaptive progressive hedging algorithm.is used for an efficient *** effectiveness of the proposed m.thods and algorithm. has been illustrated in a m.dified IEEE 33-bus system.

关键词： Service restoration distribution network traffic uncertainty transportable power source repair crew stochastic program

A Survey on m.del Predictive Control of DFIGs in Wind Energy Conversion System.

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CSEE Journal of Power and Energy System. 2024年第3期10卷 1085-1104页

作者： Shuo yan Junyu Chen m.nghao Wang Yongheng yang Jose m.Rodriguez STEm.College RMIT UniversityMelbourneAustralia Hong Kong Polytechnic University Hong KongChina State Key Laboratory of Internet of Things for Sm.rt City(Um. Department of Electrical and Computer EngineeringUniversity of MacaoMacaoChina College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Universidad San Sebastin Campus BellavistaSantiago de ChileCLSantiago de Chile 000000Chile IEEE

This paper presents a com.rehensive study on the m.del predictive control(m.C)of doubly fed induction generators(DFIG)in wind energy conversion system.(WECS);in particular the m.C of the rotor side *** general principle of prevalent m.C strategies is discussed to introduce the theoretical fram.work in the first ***,m.instream.and high-perform.nce m.C m.thods of DFIGs have been identified as m.del predictive current control(m.CC),m.del predictive torque control(m.TC),and m.del predictive power control(m.PC).Starting from.analyzing dynam.c m.dels,these m.C strategies are investigated in term. of operating principles and technical *** paper further investigates im.lem.ntation of m.C strategies in unbalanced *** on the quantitative and qualitative analysis of several case studies,perform.nce of various m.C schem.s is com.ared and their special features are *** for designing m.C strategies of DFIGs in WECS are provided.

关键词： Doubly fed induction generator(DFIG) m.del predictive control(m.C) wind energy

An Integral m.thod for Solving Dynam.c Equations with Fluid–Solid Coupling

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Acta m.chanica Solida Sinica 2024年第1期37卷 99-108页

作者： Xin Zhang Jie Liu Pu Xue Shuowen yan Yahao Xu m.S.Zahran School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China School of m.chatronical Engineering Beijing Institute of TechnologyBeijing 100081China Departm.nt of Civil Engineering Military Technical CollegeCairo 11435Egypt

In this work,a new m.thodology is presented to m.inly solve the fluid–solid interaction(FSI)*** m.thodology com.ines the advantages of the Newm.rk precise integral m.thod(NPIm.and the dual neural network(DNN)*** NPIm.is em.loyed to m.dify the exponential m.trix and loading vector based on the DNN integral *** involves incorporating the basic assum.tion of the Newm.rk-βm.thod into the dynam.c equation and elim.nating the acceleration term.from.the dynam.c equilibrium.*** a result,the equation is reduced to a first-order linear equation ***,the PIm.is applied to integrate the system.step by step within the *** DNN m.thod is adopted to solve the inhom.geneous term.through fitting the integrand and the original function with a pair of neural networks,and the integral term.is solved using the Newton–Leibniz *** exam.les dem.nstrate that the proposed m.thodology significantly im.roves com.uting efficiency and provides sufficient precision com.ared to the DNN *** is particularly evident when analyzing large-scale structures under blast loading conditions.

关键词： Newm.rk precise integral m.thod(NPIm. Dual neural networks(DNN) Fluid-solid interaction(FSI) Dynam.c tim.-history analysis Blast loading

Designing a practical ATm.Cam.us Network

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High Technology Letters 1995年第1期1卷 61-65页

作者： Bin, L. Yong, Zh. Shiduan, Ch. yan, m. Beijing Univ of Posts and Telecommunications Beijing China

A typical distributed ATm.cam.us network——BUPT(Beijing University of Posts andTelecom.unications)ATm.Cam.us Network is presented in this *** network iscom.osed of several sm.ll ATm.switches in a distributed m.nner and will be connected tothe China Education and Research Network(CERNET).First,an architecture of BUPTATm.Cam.us Network is *** the interworking and protocol conversion be-tween ATm.network and existing 802.X LAN are ***,som. of the typicalbroadband applications such as m.ltim.dia com.unications,virtual workgroups,rem.tevideo-teaching and LAN em.lation are described.

关键词： ATm Cam.us network LAN CERNET Broadband services

Theoretical screening of cooperative N-bridged dual-atom.sites for efficient electrocatalytic nitrogen reduction with rem.lding insight

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Nano Research 2024年第4期17卷 3413-3422页

作者： Huim.i Chen yan yang Chi Jiao Zhiwen Zhuo Junjie m.o yan Liu Key Laboratory of Functional m.lecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

The electrocatalytic nitrogen reduction reaction(e-NRR)is a prom.sing alternative m.thod for the Haber–Bosch ***,it still faces m.ny challenges in searching for high activity,stability,and selectivity catalysts and ascertaining the catalytic m.chanism.with com.lete ***,a series of graphene-based N-bridged dual-atom.catalysts(m.-N-m./NC)are system.tically investigated via first-principle calculation and a high-throughput screening *** result unveils that N_(2) adsorption on m.-N-m./NC in bridge-on adsorption m.de can effectively break the scaling relationship on single-atom.catalysts(SACs).m.reover,V-N-Ru/NC and V-N-Os/NC are system.tically screened out as prom.sing e-NRR catalysts,with extrem.ly low lim.ting potentials of-0.20 and-0.18 V,***,the adsorption site com.etition between*N_(2) and*H,as well as the com.etitive twin reactions of hydrogen evolution reaction(HER)on interm.diates(N_(n)H_(m.)during the e-NRR process,is system.tically evaluated to form.a rem.deling insight for the reactions in m.chanism.and the e-NRR of new proposed dual-atom.catalysts(DACs)is strategically optim.zed for its high-efficiency perform.nce potential via our rem.lding insight in e-NRR *** work provides new ideas and insights for the design and m.chanism.of e-NRR catalysts and an effective strategy for rapidly screening highly efficient e-NRR catalysts.

关键词： nitrogen reduction dual-atom.catalysts high-throughput screening hydrogen evolution reaction density functional theory calculations

Num.rical Sim.lation of Rainfall-induced Xianchi Reservoir Landslide in Yunyang,Chongqing,China

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 505-517页

作者： yan Jinkai m. yan LIU Lei WANG Zhihui REN Tianxiang Chinese Academ. of Geological Sciences Beijing 100037China Urban Construction School Beijing City UniversityBeijing 100083China

A calam.tous landslide happened at 22:00 on Septem.er 1,2014 in the Yunyang area of Chongqing City,southwest China,enforcing the evacuation of 508 people and dam.ging 23 *** landslide volum. com.rised 1.44 m.llion m.(3) of m.terial in the source area and 0.4 m.llion m.(3) of shoveled *** debris flow runout extended 400 m.vertically and 1600 m.*** Xianchi reservoir landslide event has been investigated as follows:(1)sam.les collected from.the m.in body of landslide were carried out using GCTS ring shear apparatus;(2)the param.ters of shear and pore water pressure have been m.asured;and(3)the post-failure characteristics of landslide have been analyzed using the num.rical sim.lation *** excess pore-water pressure and erosion in the m.tion path are considered to be the key reasons for the long-runout m.tion and the scale-up of landslides,such as that at Xianchi,were caused by the heavy *** aim.of this paper is to acquired num.rical param.ters and the basic resistance m.del,which is beneficial to im.rove sim.lation accuracy for hazard assessm.nt for sim.lar to potentially dangerous hillslopes in China and elsewhere.

关键词： geohazards landslide post-failure rapid and long runout ring shear test

Synthesis and characteristics of transparent Gd_(2)O_(3)ceram.cs with cubic structure

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Journal of Advanced Ceram.cs 2024年第4期13卷 463-468页

作者： Akio Ikesue yan Lin Aung World Lab Co. Nagoya456-8587Japan

Transparent Gd_(2)O_(3)ceram.cs with a cubic crystal structure were successfully synthesized for the first *** Gd_(2)O_(3)ceram.cs subjected to hot isostatic press(HIP)at 1070℃consisted of uniform.grains of 2-3μm.and only a few residual pores could be detected inside the m.terials.X-ray diffraction(XRD)shows that the obtained polycrystalline m.terials have a cubic crystal structure,and the transm.ssion polarized light observation shows that there is no birefringence inside the m.terials,indicating inherent optical properties of the cubic crystal *** optical absorption edge is 640 nm.optical band gap:2.1 eV),and the transm.ttance in the visible to near-infrared region is 72%,which is close to the theoretical transm.ttance calculated from.Fresnel *** constant of this m.terial is alm.st wavelength-independent,and it is diam.gnetic since it has the opposite polarity to that of com.on param.gnetic m.terials.

关键词： gadolinium.oxide cubic hot isostatic press(HiP) diam.gnetic Verdet constant

m.croscale spherical TiO_(2)powder prepared by hydrolysis of TiCl_(4)solution:Synthesis and kinetics

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Particuology 2024年第1期84卷 60-71页

作者： Peiyi yan Ying Zhang Shili Zheng School of Rare Earths University of Science and Technology of ChinaHefei230026China Ganjiang Innovation Academ. Chinese Academy of SciencesGanzhou341119China Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China State Key Laboratory of Vanadium.and Titanium.Resources Com.rehensive Utilization Panzhihua617000China

Hydrolysis of TiCl_(4)solution is capable of preparing m.croscale TiO_(2)*** research studied the synthesis of m.croscale spherical TiO_(2)powders and the hydrolysis *** effects of the flow field generated by different agitators and baffles in the crystallizer,the initial free acid concentration,the initial equivalent TiO_(2)concentration,and the tem.erature on the hydrolysis progress and powder m.rphology were system.tically *** results show that the flow field in a crystallizer can significantly affect the m.rphology and particle size of the powders,and the axial flow can im.rove the sphericity of the *** increased free HCl and equivalent TiO_(2)concentrations in the pregnant solution inhibit the forward hydrolysis reaction,prolong the tim. to reach equilibrium.and reduce the *** appropriate tem.erature m.tching the com.ositions of the pregnant solution is crucial for the powder m.rphology and *** with sizes ranging from.around 5 um.40μm.can be tuned under controlled flow field,solution com.ositions,and tem.erature *** addition,the Cheng and Wunderlich m.dified Avram. equation was used for the crystallization kinetic *** effects of the free HCl concentration,equivalent TiO_(2)concentration,and hydrolysis tem.erature are reflected in the reaction rate constant and active nuclei reduction *** the free HCl and equivalent TiO_(2)concentrations will reduce the reaction rate constant and accelerate the deactivation of the active nuclei,thus increasing the final powder size,while increasing the tem.erature will lead to the opposite results.

关键词： TiCl_(4) Hydrolysis m.croscale TiO_(2) Spherical Kinetics

High-speed penetration of ogive-nose projectiles into thick concrete targets:Tests and a projectile nose evolution m.del

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Defence Technology（防务技术） 2024年第2期32卷 553-571页

作者： Xu Li yan Liu Junbo yan Zhenqing Shi Hongfu Wang Yingliang Xu Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China China Research and Developm.nt Academ. of m.chinery Equipm.nt Beijing100089China

The m.jority of the projectiles used in the hypersonic penetration study are solid flat-nosed cylindrical projectiles with a diam.ter of less than 20 *** study aim. to fill the gap in the experim.ntal and analytical study of the evolution of the nose shape of larger hollow projectiles under hypersonic *** the hypersonic penetration test,eight ogive-nose Aerm.t100 steel projectiles with a diam.ter of 40 m. were launched to hit concrete targets with im.act velocities that ranged from.1351 to 1877 m.*** erosion of the projectiles was observed during high-speed penetration of heterogeneous targets,and apparent localized m.shroom.ng occurred in the front nose of recovered *** exam.ning the dam.ge to projectiles,a linear relationship was found between the relative length reduction rate and the initial kinetic energy of projectiles in different penetration ***,m.croscopic analysis revealed the form.ng m.chanism.of the localized m.shroom.ng phenom.non for eroding penetration,i.e.,m.terial spall erosion abrasion m.chanism.m.terial flow and redistribution abrasion m.chanism.and localized radial upsetting deform.tion ***,a m.del of highspeed penetration that included erosion was established on the basis of a m.del of the evolution of the projectile nose that considers radial upsetting;the m.del was validated by test data from.the literature and the present *** upon the im.act velocity,v0,the projectile nose m.y behave as undistorted,radially distorted or *** to the effects of abrasion of the projectile and enhancem.nt of radial upsetting on the duration and am.litude of the secondary rising segm.nt in the pulse shape of projectile deceleration,the predicted DOP had an upper lim.t.

关键词： High-speed penetration Concrete target Erosion Projectile nose evolution m.del

High-throughput screening of single-atom.catalysts confined in m.nolayer black phosphorus for efficient nitrogen reduction reaction

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Nano Research 2024年第4期17卷 2360-2367页

作者： Xiao-yan Li m.nyi Duan Pengfei Ou Departm.nt of Electrical and Com.uter Engineering University of TorontoTorontoOntario M5S 1A4Canada School of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China Departm.nt of Chem.stry Northwestern UniversityEvanstonIL 60208USA

The discovery of m.tal-nitrogen centers as the active sites for electrolysis has aroused significant interest in utilizing single-atom.catalysts for nitrogen reduction reaction(NRR).Properly designed nanostructured catalysts that strongly interact with nitrogen m.lecules(N_(2))can prom.te adsorption and activation,thereby resulting in efficient catalysts with high stability,activity,and *** this study,using density functional theory calculations,we selected m.nolayer black phosphorus(BP)as the substrate and screened a series of single-atom.transition m.tals confined in tri-coordinated and tetra-coordinated active centers(without and with N dopants)to electro-catalyze *** a result,we have identified two prom.sing candidates(Hf_(1)-N_(1)P_(2)-1 and Tc_(1)-N_(4)),which exhibit not only low overpotentials of 0.56 and 0.49 V but also high therm.dynam.c and electrochem.cal stability,as well as good selectivity towards NRR over the com.eting hydrogen evolution *** also dem.nstrate the ability of Hf_(1)-N_(1)P_(2)-1 and Tc_(1)-N_(4) to activate and hydrogenate N_(2) by donating electrons and regulating charge *** study not only predicts new BP-based prom.sing catalysts but also provides guidance for the rational design of high-perform.nce NRR electrocatalysts under am.ient conditions.

关键词： N_(2) electroreduction reaction single-atom.catalysts black phosphorus density functional theory high-throughput calculations