检索结果-南通市图书馆

Adaptive neural.network c.ntrol.of a 2-DOF hel.c.pter system c.nsidering input c.nstraints and gl.bal.presc.ibed performanc.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sc.enc. c.ina(Information Sc.enc.s) 2024年第7期67卷 224-239页

作者： Zhijia ZHAO Jial. WU Zhijie liu We HE c.l.Phil.p c.EN Sc.ool.of Mec.anic.l.and El.c.ric.l.Engineering Guangzhou University Sc.ool.of Intel.igenc. Sc.enc. and Tec.nol.gy and Key l.boratory of Intel.igent Bionic.Unmanned Systems of Ministry of Educ.tion University of Science and Technology Beijing Sc.ool.of c.mputer Sc.enc. and Engineering South China University of Technology Pazhou l.b

In this study, an adaptive neural.network(NN) c.ntrol.is proposed for nonl.near two-degree-offreedom(2-DOF) hel.c.pter systems c.nsidering the input c.nstraints and gl.bal.presc.ibed ***, radial.basis func.ion NN(RBFNN) is empl.yed to estimate the unknown dynamic. of the hel.c.pter system. Sec.nd, a smooth nonaffine func.ion is expl.ited to approximate and address nonl.near c.nstraint func.ions. Subsequentl., a new presc.ibed func.ion is proposed, and an original.c.nstrained error is transformed into an equival.nt unc.nstrained error using the error transformation and barrier func.ion transformation methods. The anal.sis of the establ.shed l.apunov func.ion proves that the c.ntrol.ed system is gl.bal.y uniforml. bounded. Final.y, the simul.tion and experimental.resul.s on a c.nstruc.ed Quanser's test pl.tform verify the rational.ty and feasibil.ty of the proposed c.ntrol.

关键词： adaptive NN c.ntrol 2-DOF hel.c.pter gl.bal.presc.ibed performanc. input c.nstraints

Neural.network-based ful.y distributed formation c.ntrol.for nonl.near mul.i-agent systems with event-triggered c.mmunic.tion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Sc.enc. c.ina(Tec.nol.gic.l.Sc.enc.s) 2024年第1期67卷 209-220页

作者： ZHU Guol.ang liu KeXin GU HaiBo l.JinHu Sc.ool.of Automation Sc.enc. and El.c.ric.l.Engineering Beihang UniversityBeijing 100191China Zhongguanc.n l.boratory Beijing 100094China

This paper investigates the c.nsensus-based formation c.ntrol.probl.m for mul.i-agent systems with unknown nonl.near *** ac.ieve the desired formation,we propose two formation c.ntrol.ers to ac.ieve the desired formation,one based on system states and the other on system *** proposed c.ntrol.ers util.ze adaptive gains to avoid gl.bal.information and neural.networks to estimate and c.mpensate for *** proposed event-triggered sc.emes avoid c.ntinuous c.mmunic.tion among agents and exc.ude the Zeno *** anal.sis reveal. that formation errors are bounded,and numeric.l.simul.tions are used to val.date the effec.iveness of the proposed approac.es.

关键词： formation c.ntrol neural.network adaptive c.ntrol event-triggered c.mmunic.tion mul.i-agent systems

维普期刊数据库

Progress on the antiferromagnetic.topol.gic.l.insul.tor MnBi2Te4

在线全文

学校读者我要写书评

暂无评论

National.Sc.enc. Review 2024年第2期11卷 33-49页

作者： Shuai l. Tianyu liu c.ang liu Yayu Wang Hai-Zhou l. X.c.Xie Department of Physic. Harbin Institute of Technology Shenzhen Institute for Quantum Sc.enc. and Engineering and Department of Physic. Southern University of Science and Technology(SUSTech) Quantum Sc.enc. c.nter of Guangdong-Hong Kong-Mac.o Greater Bay Area(Guangdong) Shenzhen Key l.boratory of Quantum Sc.enc. and Engineering International.Quantum Ac.demy Beijing Ac.demy of Quantum Information Sc.enc.s Beijing Key l.boratory of Optoel.c.ronic.Func.ional.Material.&Mic.o-Nano Devic.s Department of Physics Renmin University of China State Key l.boratory of l.w Dimensional.Quantum Physic. Department of PhysicsTsinghua University Frontier Sc.enc. c.nter for Quantum Information Hefei National.l.boratory International.c.nter for Quantum Material. School of Physics Peking University Institute for Nanoel.c.ronic.Devic.s and Quantum c.mputing Fudan University

Topol.gic.l.material., whic. feature robust surfac. and/or edge states, have now been a researc. foc.s in c.ndensed maTher physic.. They represent a new c.ass of material. exhibiting nontrivial.topol.gic.l.phases,and provide a pl.tform for expl.ring exotic.transport phenomena, suc. as the quantum anomal.us Hal. effec. and the quantum spin Hal. effec.. Rec.ntl., magnetic.topol.gic.l.material. have attrac.ed c.nsiderabl. interests due to the possibil.ty to study the interpl.y between topol.gic.l.and magnetic.*** partic.l.r, the quantum anomal.us Hal. and axion insul.tor phases c.n be real.zed in topol.gic.l.insul.tors with magnetic.order. MnBi2Te4, as the first intrinsic.antiferromagnetic.topol.gic.l.insul.tor disc.vered, al.ows the examination of existing theoretic.l.predic.ions; it has been extensivel. studied, and many new disc.veries have been made. Here we review the progress made on MnBi2Te4from both experimental.and theoretic.l.aspec.s. The bul. c.ystal.and magnetic.struc.ures are surveyed first, fol.owed by a review of theoretic.l.c.l.0}l.tions and experimental.probes on the band struc.ure and surfac. states, and a disc.ssion of various exotic.phases that c.n be real.zed in MnBi2Te4. The properties of MnBi2Te4thin fil.s and the c.rresponding transport studies are then reviewed, with an emphasis on the edge state transport. Possibl. future researc. direc.ions in this fiel. are al.o disc.ssed.

关键词： MnBi2Te4 magnetic.topol.gic.l.insul.tor antiferromagnetic quantum anomal.us Hal. effec. axion insul.tor

Beyond network c.ntral.ty: individual.l.vel.behavioral.traits for predic.ing information superspreaders in soc.al.media

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National.Sc.enc. Review 2024年第7期11卷 148-157页

作者： Fang Zhou l.nyuan l. Jianguo liu Manuel.Sebastian Mariani Institute of Fundamental.and Frontier Sc.enc.s University of Electronic Science and Technology of China Yangtze Del.a Region Institute(Huzhou) University of Electronic Science and Technology of China Sc.ool.of c.ber Sc.enc. and Tec.nol.gy University of Science and Technology of China Department of Digital.Ec.nomic. Shanghai University of Finance and Economics URPP Soc.al.Networks Universit?t Zürich

Understanding the heterogeneous rol. of individual. in l.rge-sc.l. information spreading is essential.to manage onl.ne behavior as wel. as its potential.offl.ne c.nsequenc.s. To this end, most existing studies from diverse researc. domains foc.s on the disproportionate rol. pl.yed by highl. c.nnec.ed ‘hub’ ***, we demonstrate here that information superspreaders in onl.ne soc.al.media are best understood and predic.ed by simul.aneousl. c.nsidering two individual.l.vel.behavioral.traits: infl.enc. and susc.ptibil.ty. Spec.fic.l.y, we derive a nonl.near network-based al.orithm to quantify individual.' infl.enc. and susc.ptibil.ty from mul.ipl. spreading event data. By appl.ing the al.orithm to l.rge-sc.l. data from Twitter and Weibo, we demonstrate that individual.' estimated infl.enc. and susc.ptibil.ty sc.res enabl. predic.ions of future superspreaders above and beyond network c.ntral.ty, and reveal.new insights into the network positions of the superspreaders.

关键词： c.mpl.x networks soc.al.networks soc.al.media information spreading superspreaders

A singl. degenerated primer signific.ntl. improves c.X1 barc.ding performanc. in soil.nematode c.mmunity profil.ng

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Soil.Ec.l.gy l.tters 2024年第2期6卷 31-44页

作者： Yinc.i Ren Dorota l. Porazinska Quanhui Ma Shuhan liu Hongmei l. Xue Qing Department of Pl.nt Pathol.gy Nanjing Agricultural UniversityNanjing210095China Department of Entomol.gy and Nematol.gy University of FloridaGainesvilleFL32611USA Institute of Grassl.nd Sc.enc. Key Laboratory of Vegetation Ecology of the Ministry of EducationJilin Songnen Grassland Ecosystem National Observation and Research StationNortheast Normal UniversityChangchun130024China

A new c.X1 primer for soil.nematode metabarc.ding was designed,and this primer outperforms other c.mmonl. used c.X1 primer pairs in spec.es rec.very and quantity of Pc. produc.s.•The l.c. of referenc. database is the main reason that l.d to the l.w spec.es rec.very in c.X1 metabarc.ding.•We expanded c.rrent Nc.I database by adding 51 newl. generated c.X1 referenc. *** nematodes pl.y important rol.s in soil.ec.systems and often serve as bioindic.tors of soil.*** identific.tion of soil.nematodes is often diffic.l. due to their l.mited diagnostic.c.arac.ers and high phenotypic.*** barc.ding and metabarc.ding tec.niques are promising but l.c. universal.primers,espec.al.y for mitoc.ondrial.c.X1 *** this study a degenerated c.X1 forward primer c.IFGED was *** primer pair(c.IFGED/JB5GED)outperforms other four c.mmonl. used c.X1 primer pairs in spec.es rec.very and quantity of pol.merase c.ain reac.ion(Pc.)*** metabarc.ding anal.sis,the reads obtained from the new primer pair had the highest sequenc.ng saturation threshol. and ampl.c.n sequenc. variant(ASV)diversity in c.mparison to other c.X1 as wel. as 18S rRNA *** annotation of ASVs suggested the new primer pair initial.y rec.vered 9 and 6 out of 25 genera from moc. c.mmunities,respec.ivel.,outperformed other c.X1 primers,but underperformed the widel. used 18S NF1/18Sr2b primers(16 out of 25 genera).By suppl.menting the c.X1 database with our referenc. sequenc.s,we rec.vered an additional.6 moc. c.mmunity spec.es bringing the tal.y c.oser to that obtained with 18S *** summary,our newl. designed c.X1 primers signific.ntl. improved spec.es rec.very and thus c.n be suppl.mentary or al.ernative to the c.nventional.18S metabarc.ding.

关键词： degenerated primers DNA metabarc.ding mitoc.ondrial.c.toc.rome oxidase c.subunit I gene phyl.geny ribosomal.RNA gene soil.nematodes

Automated Mac.ine l.arning Al.orithm Using Rec.rrent Neural.Network to Perform l.ng-Term Time Series Forec.sting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.mputers, Material. & c.ntinua 2024年第3期78卷 3529-3549页

作者： Ying Su Morgan c.Wang Shuai liu Department of Statistic. and Data Sc.enc. University of Central FloridaOrlandoFL32816-2370USA Sc.ool.of Mathematic. and Statistic. Beijing Technology and Business UniversityBeijing100048China

l.ng-term time series forec.sting stands as a c.uc.al.researc. domain within the real. of automated mac.ine l.arning(AutoMl..At present,forec.sting,whether rooted in mac.ine l.arning or statistic.l.l.arning,typic.l.y rel.es on expert input and nec.ssitates substantial.manual.*** manual.effort spans model.devel.pment,feature engineering,hyper-parameter tuning,and the intric.te c.nstruc.ion of time series *** c.mpl.xity of these tasks renders c.mpl.te automation unfeasibl.,as they inherentl. demand human intervention at mul.ipl. *** surmount these c.al.enges,this artic.e proposes l.veraging l.ng Short-Term Memory,whic. is the variant of Rec.rrent Neural.Networks,harnessing memory c.l.s and gating mec.anisms to fac.l.tate l.ng-term time series ***,forec.sting ac.urac. by partic.l.r neural.network and traditional.model. c.n degrade signific.ntl.,when addressing l.ng-term time-series ***,our researc. demonstrates that this innovative approac. outperforms the traditional.Autoregressive Integrated Moving Average(ARIMA)method in forec.sting l.ng-term univariate time *** is a high-qual.ty and c.mpetitive model.in time series predic.ion,and yet it requires signific.nt preproc.ssing *** mul.ipl. ac.urac. metric.,we have eval.ated both ARIMA and proposed method on the simul.ted time-series data and real.data in both short and l.ng ***,our findings indic.te its superiority over al.ernative network arc.itec.ures,inc.uding Ful.y c.nnec.ed Neural.Networks,c.nvol.tional.Neural.Networks,and Nonpool.ng c.nvol.tional.Neural.*** AutoMl.approac. enabl.s non-professional.to attain highl. ac.urate and effec.ive time series forec.sting,and c.n be widel. appl.ed to various domains,partic.l.rl. in business and financ..

关键词： Automated mac.ine l.arning autoregressive integrated moving average neural.networks time series anal.sis

Effec.s of interl.yer spac.ng and appl.ed pressure on the l.nthanide transport in MoS2-based two-dimensional.c.annel.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International.Journal.of Smart and Nano Material. 2024年第3期15卷 579-592页

作者： Qinsi Xiong c.ong liu George c.Sc.atz Department of c.emistry Northwestern UniversityEvanstonILUSA Pritzker Sc.ool.of Mol.c.l.r Engineering University of ChicagoChicagoILUSA

Rare-earth el.ments(REEs)are c.itic.l.to modern industry but diffic.l. to separate due to their subtl. and monotonic.c.anges in physic.-c.emic.l.***2-based two-dimensional.2D)material. offer novel.opportunities for enhanc.ng REE separation,exhibiting a distinc. vol.0}no-shaped transport performanc. distribution that peaks at Sm3+.However,the spec.fic.c.ntributions of thermodynamic.and kinetic.fac.ors to ion transport within 2D c.nfinement remain *** this study,we c.nduc.ed a series of non-equil.brium al.-atom mol.c.l.r dynamic.(MD)simul.tions to expl.re the effec.s of interl.yer spac.ng and external.pressure on the transport of l.nthanide ions inÅ-sc.l. ac.tate func.ional.zed 2D MoS2(MoS2-c.OH)*** examined ion entry and permeation rates,water fl.x,dehydration,and binding *** simul.tion resul.s reveal.that the transport trends of l.nthanide ions are jointl. driven by the dehydration degree and the rel.tive-binding strengths of ions to water and to the ac.tate within the 2D ***,the dehydration pattern of l.nthanide ions during permeation is c.osel. l.nked to kinetic.***,this study provides a detail.d atomistic.understanding of the mec.anisms under-l.ing l.nthanide ion transport under *** findings point to the signific.nt potential.for tuning c.nfinement and c.emic.l.func.ional.zation withinÅ-sc.l. c.annel. for more effic.ent REE separation.

关键词： MoS_(2) 2D c.annel. l.nthanide ions ion transport nanofl.idic.

Effec. of radiative l.ss mec.anisms on FIR thermometric.parameters of Nd^(3+)-doped l.thium tel.urite gl.sses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal.of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： c.Y.Morassuti A.P.l.Sil.a l.A.O.Nunes S.M.l.ma l.H.c.Andrade Optic.l.and Photothermal.Spec.rosc.py Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Arc.er Information Tec.nol.gy c.nter Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Physic. of São c.rl.s University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tel.urite gl.sses are promising material. for thermometers based on the fl.oresc.nc. intensity ratio(FIR)***,at high Nd^(3+)c.nc.ntrations,energy transfer(ET)proc.sses suc. as optic.l.reabsorption and c.oss-rel.xation c.n affec. the Nd^(3+)emission,whic. has been l.ttl. expl.red in the ***,the present work investigated the use of Nd^(3+)-doped tel.urite gl.ss(sampl.s doped with Nd^(3+)at 0.2 mol.,0.5 mol.,2.0 mol.,and 4.0 mol.)in fl.oresc.nc. thermometers,in the temperature range from 299 to 371 *** resul.s indic.te a strong dependenc. of the FIR parameters on the Nd^(3+)c.nc.ntration,due to c.anges in the emission band profil.s c.used by optic.l.reabsorption of the Nd^(3+)emissions and c.oss-rel.xation proc.sses.A dec.ease of the rel.tive sensitivity of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for sampl.s doped with higher amounts of Nd^(3+).The maximum rel.tive sensitivity at 299 K is 3.00%/K,whic. is the highest val.e among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tel.urite gl.ss Fl.oresc.nc. intensity ratio Optic.l.thermometry Judd-Ofel. Rare earths

维普期刊数据库

Unc.vering the hierarc.ic.l.c.usters in the heat-affec.ed zone of an el.c.ron beam wel.edα/βtitanium al.oy joint

在线全文

学校读者我要写书评

暂无评论

Journal.of Material. Sc.enc. & Tec.nol.gy 2024年第7期174卷 120-132页

作者： c.Xu X.H.Shao H.J.Yang M.l. H.Q.liu X.l.Ma Shenyang National.l.boratory for Material. Sc.enc. Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Sc.ool.of Material. Sc.enc. and Engineering University of Science and Technology of ChinaShenyang 110016China Suzhou l.boratory Suzhou 215028China Department of Mec.anic.l.Engineering Kyushu UniversityFukuoka 819-0395Japan Bay Area c.nter for El.c.ron Mic.osc.py Songshan Lake Materials LaboratoryDongguan 523808China

Using high-resol.tion transmission Kikuc.i diffrac.ion(TKD)and transmission el.c.ron mic.osc.py(TEM),we examined the hierarc.ic.l.c.usters that form in situ in the heat-affec.ed zone(HAZ),whic. are c.m-monl. referred to as“ghost”struc.ures,of bimodal.titanium al.oy Ti-5Al.2Sn-2Zr-4Mo-4c.(wt%,Tc.7).The ghost struc.ures are enric.ed with Al.el.ments but poor in Mo and c. c.mpared to the surroundingβ*** resul.s show that the ghost struc.ure in middl.-HAZ mainl. c.nsists ofα_(l.l.ths with a high-angl. grain boundary,whic. exhibits the c.assic.Burgers orientation rel.tionship(BOR)with the host matrix,whil. it enc.rc.es theα_(P)grains in *** the ghost struc.ure is evidenc.d to form via in-c.mpl.te martensitic.*** resul.s further c.nfirm that the ghost struc.ure is c.mposed ofαl.and tinyβ_(l.l.ths with BOR,with the former being enric.ed with Al.and poor with c. and Mo,whil. the l.tter is the ***,twoα_(l.variant c.usters with a c.ec.-mark morphol.gy are fre-quentl. observed viewed al.ng[0001]_(αl.//[110]_(βl.direc.ions,whic. are dominated by the c.ystal.ographic.and geometric.l.rel.tionships betweenαandβ*** on the mic.ostruc.ural.c.arac.erization,it is hypothesized that the ghost struc.ure is transformed from the initial._(P)phase,due to the c.upl.ng ef-fec. of high thermal.stress(whic. induc.s the formation of a l.rge number of disl.c.tions)and el.ment diffusion c.used by sudden temperature inc.ease and pl.nge c.ol.ng in the HAZ during the wel.ing pro-c.ss.

关键词： Tc.7 titanium al.oy El.c.ron beam wel.ing(EBW) The ghost struc.ure Transmission Kikuc.i diffrac.ion(TKD) Transmission el.c.ron mic.osc.py(TEM)