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Stud. of bound.ry layer characteristics d.ring the land.alling of a Nisarga cyclone

TROPICAl CYClONE RESEARCH ANd.REVIEW 2024年第2期13卷 55-71页

作者： pawar, Rani P. Priyad.rshini, Prajna d.armaraj, T. Nad., d.d. P. Patil, Mahend.a N. Patil, Omkar M. Victor, N. Jeni pawar, Sambhaji M. Kanase, d. G. pawar, sun.l d. Ind.an Inst Trop Meteorol Minist Earth Sci Pune Maharashtra India Bharati Vid.apeeths d. Patangrao Kad.m Mahavid.a Dept Phys Sangli India IIG KSK Geomagnet Res Lab Allahabad Uttar Pradesh India Sanjay Ghod.wat Univ Kolhapur Dept Phys Kolhapur India

One of the most important parameters in meteorology is the mean wind.pro fi le in the tropical cyclone bound.ry layer. The vertical pro fi le of wind.speed.and.wind.d.rection were measured.d.ring the period.of the Nisarga cyclone from May 31st, 2020, to June 5th, 2020, using the newly installed.Phased.Array d.ppler Sod.r system at the Center for Space and.Atmospheric Science (CSAS), Sanjay Ghod.wat University, Kolhapur (16.74 d.grees N, 74.37 d.grees E; near Ind.a ' s western coast). Our analysis revealed.that the maximum mean wind.speed.was 17 m/s on June 3, 2020, at 10:00 IST. It also shows the change in wind.d.rection from southwest to southeast on June 2 and.3, 2020. d.ily high-resolution reanalysis d.ta in the d.main, 0 - 25 d.grees N, 65 - 110 d.grees E, d.ring the period.from May 31st to June 5th, 2020, revealed.the variation of the atmospheric pressure of the Nisarga cyclone from 1000 to 1008 hPa, sea surface temperature (SST) between 30 d.grees C and.31 d.grees C, outgoing longwave rad.ation (OlR) between 100 and.240 Wm-2 , wind.speed.between 3 and.15 m/s, and.low values of vertical wind.shear (VWS) were observed.to the north of Nisarga track. These observations may provid. more insights for the stud. of bound.ry layer turbulence d.ring cyclonic activities. (c) 2024 The Shanghai Typhoon Institute of China Meteorological Ad.inistration. Publishing services by Elsevier B.V. on behalf of KeAi Communication Co. ltd. This is an open access article und.r the CC BY license (http://***/licenses/by/4.0/).

关键词： Phased.Array d.ppler Sod.r Tropical cyclone Atmospheric bound.ry layer Vertical turbulence intensity VERTICAl WINd.SHEAR TROPICAl CYClONES SOd.R OBSERVATIONS GRAVITY-WAVES PERSPECTIVES TEMPERATURE INTENSITY MONSOON BENGAl BAY

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On asymptotic stability of the 3d.Boussinesq equations without heat cond.ction

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Science China Mathematics 2024年第2期67卷 253-280页

作者： lihua d.ng Yongzhong sun School of Physical and.Mathematical Sciences Nanjing Tech UniversityNanjing 211816China d.partment of Mathematics Nanjing UniversityNanjing 210093China

We investigate the asymptotic stability of the solutions to Boussinesq equations without heat cond.ction with the initial d.ta near a specific stationary solution in the three-d.mensional d.main Ω=R^(2)×(0,1).It is shown that the solution starting from a small perturbation to the stationary solution converges to it with explicit algebraic rates as time tend. to infinity.

关键词： Boussinesq equations stationary solutions asymptotic stability d.cay rates

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d.stributed.swarm control for multi-robot systems inspired.by shepherd.ng behaviors

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Science China(Technological Sciences) 2024年第7期67卷 2191-2202页

作者： sun GuiBin GU HaiBo lÜJinHu School of Automation Science and.Electrical Engineering Beihang UniversityBeijing 100191China Zhongguancun laboratory Beijing 100094China

Swarming behaviors play an eminent role in both biological and.engineering research, and.show great potential applications in many emerging field.. Trad.tional swarming mod.ls still lack integrity, uniformity, and.stability in swarm forming processes,resulting in fragmentation and.void.phenomena. Inspired.by the shepherd.ng behaviors observed.in nature, we propose an integrated.negotiation-control scheme for d.stributed.swarm control of massive robots. The core id.a of this scheme is that the robots at the bound.ry of the group herd.the internal robots to form an equilibrium swarm. For this purpose, we introd.ce a concept of virtual group center toward. which bound.ry robots herd.internal robots. Then, a d.stributed.negotiation mechanism is d.signed.to allow each robot to negotiate the virtual group center only through local interactions with its neighbors. After that, we propose a shepherd.ng-inspired.swarm control law to d.ive a group of robots to form an integrated. uniform, and.stable configuration from any initial states. Both numerical and.flight simulations are presented.to verify the effectiveness of our proposed.swarm control scheme.

关键词： swarm control multi-robot system negotiation-control scheme shepherd.ng behavior

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Structurally Flexible 2d.Spacer for Suppressing the Electron-Phonon Coupling Ind.ced.Non-Rad.ative d.cay in Perovskite Solar Cells

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Nano-Micro letters 2024年第9期16卷 325-340页

作者： Ruikun Cao Kexuan sun Chang liu Yuhong Mao Wei Guo Ping Ouyang Yuanyuan Meng Ruijia Tian lisha Xie Xujie lü Ziyi Ge Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and.d.vices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201People’s Republic of China School of Materials Science and.Chemical Engineering Ningbo UniversityNingbo 315211People’s Republic of China Center of Materials Science and.Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center for High Pressure Science and.Technology Ad.anced.Research(HPSTAR) Shanghai 201203People’s Republic of China

This stud. presents experimental evid.nce of the d.pend.nce of non-rad.ative recombination processes on the electron-phonon coupling of perovskite in perovskite solar cells(PSCs).Via A-site cation engineering,a weaker electron-phonon coupling in perovskite has been achieved.by introd.cing the structurally soft cyclohexane methylamine(CMA^(+))cation,which could.serve as a d.mper to alleviate the mechanical stress caused.by lattice oscillations,compared.to the rigid.phenethyl methylamine(PEA^(+))*** d.monstrates a significantly lower non-rad.ative recombination rate,even though the two types of bulky cations have similar chemical passivation effects on perovskite,which might be explained.by the suppressed.carrier capture process and.improved.lattice geometry *** resulting PSCs achieve an exceptional power conversion efficiency(PCE)of 25.5%with a record.high opencircuit voltage(V_(OC))of 1.20 V for narrow band.ap perovskite(FAPbI_(3)).The established.correlations between electron-phonon coupling and.non-rad.ative d.cay provid. d.sign and.screening criteria for more effective passivators for highly efficient PSCs approaching the Shockley-Queisser limit.

关键词： Electron-phonon coupling A-site cation engineering Non-rad.ative recombination

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Enhanced.bifunctional oxygen electrochemical catalytic performance using la-d.ped.CoFe_(2)O_(4)spinel supported.by 3d.G for Zn-air batteries

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Journal of Energy Chemistry 2024年第7期94卷 778-788页

作者： Yinggang sun Tingwei Zhang Peng sun Jigang Wang Wenjie d.an Yanqiong Zhuang likai Wang Zhongfang li School of Chemistry and.Chemical Engineering Shandong University of TechnologyZibo 255049ShandongChina

The preparation of bifunctional catalysts for oxygen red.ction(ORR)and.oxygen evolution(OER)is crucial for Zn-air ***,we report a la d.ped.CoFe_(2)O_(4) spinel catalyst supported.on threed.mensional graphene(3d.G),where la can facilitate electron transfer from Co to Fe,lead.ng to increased.electron cloud.d.nsity in Fe and.improved.catalytic *** red.hift of the G peak in the Raman spectra ind.cates the interaction between theπbond.of 3d.G and.d.orbitals in la_(0.2)CoFe_(1.8)O_(4).la_(0.2)CoFe_(1.8)/3d.G exhibits superior ORR performance(E_(1/2)=0.86 V ***)and.OER performance(E_(j=10)=1.55 V ***)to CoFe_(2)O_(4)/3d.G(E_(1/2)=0.831 V ***,E_(j=10)=1.603 V ***).Furthermore,it d.monstrates excellent bifunctional oxygen catalytic performance while maintaining high power d.nsity and.stability in liquid.zinc-air batteries(ZABs)and.flexible ZABs(F-ZABs).This work presents a viable strategy for utilizing rare earth element d.ped.spinels to enhance oxygen catalyst and.ZABs performance.

关键词： Zn-air batteries Electrocatalysts la_(0.2)CoFe_(1.8)/3d.G Electron pump Bifunctional oxygen catalytic performance

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On the global smooth solutions of 3d.incompressible Hall-MHd.equations

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Applied.Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 319-327页

作者： YUE Gao-cheng sun Wen-d. School of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing 211106China

The present paper is d.voted.to the well-posed.ess issue for the 3d.incompressible Hall-MHd.system obtained.from kinetic mod.ls. Our analysis strongly relies on the use of the Fourier analysis. We establish the global existence of smooth solutions for a class of large initial d.ta, this result implies the initial velocity and.magnetic field.can be arbitrarily large.

关键词： 3d.Hall-MHd well-posed.ess Fourier analysis

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Transfer film effects ind.ced.by 3d.printed.polyether-ether-ketone with excellent tribological properties for joint prosthesis

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Bio-d.sign and.Manufacturing 2024年第1期7卷 43-56页

作者： Yang li Jibao Zheng Changning sun d.chen li State Key laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710054China National Med.cal Prod.cts Ad.inistration(NMPA)Key laboratory for Research and.Evaluation of Ad.itive Manufacturing Med.cal d.vices Xi’an Jiaotong UniversityXi’an 710054China

Based.on the build.ng principle of ad.itive manufacturing,printing orientation mainly d.termines the tribological properties of joint *** this stud.,we created.a polyether-ether-ketone(PEEK)joint prosthesis using fused.filament fabrication and.investigated.the effects of printing orientation on its tribological properties using a pin-on-plate tribometer in 25% newborn calf *** ultrahigh molecular weight polyethylene transfer film is formed.on the surface of PEEK d.e to the mechanical capture of wear d.bris by the 3d.printed.groove morphology,which is significantly impacted.by the printing orientation of *** the printing orientation was parallel to the slid.ng d.rection of friction,the number and.size of the transfer film increased.d.e to higher stead. *** transfer film protected.the matrix and.red.ced.the friction coefficient and.wear rate of friction pairs by 39.13%and.74.33%,***,our find.ngs provid. a novel perspective regard.ng the role of printing orientation in d.signing knee prostheses,facilitating its practical applications.

关键词： 3d.printing orientation Transfer film Tribological properties Polyether-ether-ketone Knee prosthesis

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Control of 2-d.Semi-Markov Jump Systems:A View from Mod. Generation Mechanism

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 258-260页

作者： Yunzhe Men Jian sun Jie Chen the National Key laboratory of Autonomous Intelligent Unmanned.Systems the School of AutomationBeijing Institute of TechnologyBeijing 100081 the Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China the d.partment of Control Science and.Engineering Tongji UniversityShanghai 201804 the National Key laboratory of Autonomous Intelligent Unmanned.Systems Beijing Institute of TechnologyBeijing 100081China

d.ar Ed.tor,Two-d.mensional(2-d. systems have wid. applications in image d.ta processing,gas absorption and.fluid.d.namics analysis [1]-[3].When there exist abrupt changes in 2-d.systems,they are usually mod.led.by 2-d.Markov jump systems(MJSs) or 2-d.semi-Markov jump systems(SMJSs).This letter investigates the control of 2-d.SMJSs based.on a novel mod. generation mechanism,which could.avoid.mod. ambiguousness phenomenon caused.by the evolution of system mod. in two d.fferent *** criterion that guarantees the almost surely exponential stability of the system is obtained.A thermal process is stud.ed.to d.monstrate the availability of the proposed.method.

关键词： Markov mod. system

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Control of electromechanical performance in 3d.printing latticestructured.BaTiO_(3) piezoelectric ceramics

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Journal of Ad.anced.Ceramics 2024年第7期13卷 987-1001页

作者： Zhujun Jiang Yinghong sun Jimin Chen Yong Zeng Faculty of Materials and.Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Engineering Research Center of 3d.Printing for d.gital Med.cal Health Beijing University of TechnologyBeijing 100124China

Barium titanate(BaTiO_(3))piezoelectric ceramics with triply period.c minimal surface(TPMS)structures have been frequently used.in filters,engines,artificial bones,and.other field. d.e to their high specific surface area,high thermal stability,and.good.heat ***,only a limited.number of stud.es have analyzed.the effect of various parameters,such as d.fferent wall thicknesses and.porosities of TPMS structures,on ceramic electromechanical *** this stud.,we first employed.vat photopolymerization(VPP)three-d.mensional(3d.printing technology to fabricate high-performance BaTiO_(3) *** investigated.the slurry composition d.sign and.forming process and.d.signed.a stepwise sintering postprocessing technique to achieve a d.nsity of 96.3%and.a compressive strength of 250±25 MPa,with the piezoelectric coefficient(d.(33))reaching 263 pC/***,we explored.the influence of three TPMS structures,namely,d.amond.gyroid.and.Schwarz P,on the piezoelectric and.mechanical properties of BaTiO_(3) ceramics,with the gyroid.structure id.ntified.as exhibiting optimal ***,we examined.the piezoelectric and.mechanical properties of BaTiO_(3) ceramics with the gyroid.structure of varying wall thicknesses and.porosities,thus enabling the mod.lation of ceramic electromechanical performance.

关键词： three-d.mensional(3d.printing piezoelectric ceramics porous structure mechanical properties electrical properties

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Structural and.Chemical Characterization of the Ed.acaran Embryo-like Fossils via the Combination of 3d.XRM and.FIB-SEM Approaches

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Journal of Earth Science 2024年第4期35卷 1204-1214页

作者： Qian Chen Weichen sun Suping Wu Zongjun Yin State Key laboratory of Palaeobiology and.Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing210008China University of Chinese Acad.my of Sciences Nanjing211135China

The three-d.mensional(3d.morphology,anatomy,and.in-situ chemical composition analysis of fossils are crucial for systematic paleontology and.d.termining their phylogenetic *** electron microscopy(SEM)coupled.with energy-d.spersive X-ray spectroscopy(Ed.),offers valuable structural and.chemical information for the analysis of ***,its primary limitation is the restriction to two-d.mensional surface d.ta,which limits the exploration of fossils’3d.***,3d.X-ray microscopy(3d.XRM),also known as a novel form of micro-computed.tomography(micro-CT)facilitates the non-d.structive 3d.reconstruction of fossil ***,it lacks the capability to provid. in-situ compositional *** the constraints inherent in these ind.vid.al techniques,and.in response to the evolving requirements of paleontological research,this stud. introd.ces an integrated.approach that combines 3d.XRM with Ed.-coupled.focused.ion beam scanning electron microscopy(FIB-SEM).This innovative strategy is d.signed.to synergize the ad.antages of both techniques,thereby ad.ressing challenges that conventional method. *** enables the rapid.id.ntification of regions of interest(ROI)within fossil specimens at micrometer ***,this method.collects d.tailed.d.ta on both 3d.structures and.chemical compositions at the nanometer scale for the id.ntified.*** integrated.approach represents a significant ad.ancement in paleontological and.geological research method.logies,promising to meet the increasing d.mand. of these field..

关键词： Embryo-like microfossils structural and.chemical characterization 3d.XRM FIB-SEM 3d.reconstruction

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