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Dynamic Event-Triggered consensus control for Input constrained Multi-Agent Systems With a Designable Minimum Inter-Event Time

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IEEE/cAA Journal of Automatica Sinica 2024年第3期11卷 649-660页

作者： Meilin li Yue long Tieshan li Hongjing liang c.l.Philip chen the School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China IEEE the Yangtze Delta Region Institute University of Electronic Science and Technology of ChinaHuzhou 313000 the laboratory of Electromagnetic Space cognition and Intelligent control Beijing 100089China the School of computer Science and Engineering South China University of TechnologyGuangzhou 510006

This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).consider the MASs with small-sc.l. networks where a centralized dynamic ETM with global information of the MASs is first ***,a distributed dynamic ETM which only uses loc.l.information is developed for the MASs with large-sc.l. *** is shown that the semi-global consensus of the MASs can be achieved by the designed bounded control protoc.l.where the Zeno phenomenon is eliminated by a designable minimum inter-event *** addition,it is easier to find a trade-off between the convergence rate and the minimum inter-event time by an adjustable ***,the results are extended to regional consensus of the MASs with the bounded control *** simulations show the effectiveness of the proposed approach.

关键词： constrained input designable minimum inter-event time directed communication topology dynamic event-triggered mechanism MASs consensus control

Adaptive neural network control of a 2-DOF helicopter system considering input constraints and global prescribed performance

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Science china(Information Sciences) 2024年第7期67卷 224-239页

作者： Zhijia ZHAO Jiale WU Zhijie lIU We HE c.l.Philip chen School of Mechanic.l.and Electric.l.Engineering Guangzhou University School of Intelligence Science and Technology and Key laboratory of Intelligent Bionic Unmanned Systems of Ministry of Education University of Science and Technology Beijing School of computer Science and Engineering South China University of Technology Pazhou lab

In this study, an adaptive neural network(NN) control is proposed for nonlinear two-degree-offreedom(2-DOF) helicopter systems considering the input constraints and global prescribed ***, radial basis function NN(RBFNN) is employed to estimate the unknown dynamics of the helicopter system. Second, a smooth nonaffine function is exploited to approximate and address nonlinear constraint functions. Subsequently, a new prescribed function is proposed, and an original constrained error is transformed into an equivalent unconstrained error using the error transformation and barrier function transformation methods. The analysis of the established lyapunov function proves that the controlled system is globally uniformly bounded. Finally, the simulation and experimental results on a constructed Quanser's test platform verify the rationality and feasibility of the proposed control.

关键词： adaptive NN control 2-DOF helicopter global prescribed performance input constraints

Rogue wave solutions and rogue-breather solutions to the focusing nonlinear Schr?dinger equation

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communications in Theoretic.l.Physics 2024年第3期76卷 33-41页

作者： Si-Jia chen Xing lü c.l.ege of Science Tianjin University of TechnologyTianjin 300384People's Republic of China Department of Mathematics Beijing Jiaotong UniversityBeijing 100044People's Republic of China Beijing laboratory of National Economic Security Early-warning Engineering Beijing Jiaotong UniversityBeijing 100044People's Republic of China

Based on the long wave limit method,the general form of the second-order and third-order rogue wave solutions to the focusing nonlinear Schr?dinger equation are given by introducing some arbitrary *** interaction solutions between the first-order rogue wave and one-breather wave are constructed by taking a long wave limit on the two-breather *** applying the same method to the three-breather solutions,two types of interaction solutions are obtained,namely the first-order rogue wave and two breather waves,the second-order rogue wave and one-breather wave,*** influence of the parameters related to the phase on the interaction phenomena is graphic.l.y *** occur among the rogue waves and breather *** the c.l.isions,the shape of them remains *** abundant interaction phenomena in this paper will contribute to a better understanding of the propagation and control of nonlinear waves.

关键词： nonlinear Schrodinger equation rogue wave solutions interaction solutions

Effects of layer interactions on instantaneous stability of finite Stokes flows

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 69-84页

作者： chen ZHAO Zhenli chen c.T.MUTASA Dong lI School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China

The stability analysis of a finite Stokes layer is of practic.l.importance in flow control. In the present work, the instantaneous stability of a finite Stokes layer with layer interactions is studied via a linear stability analysis of the frozen phases of the base flow. The osc.l.ations of two plates can have different velocity amplitudes, initial phases, and frequencies. The effects of the Stokes-layer interactions on the stability when two plates osc.l.ate synchronously are analyzed. The growth rates of two most unstable modes when δ lmost equal, and δ = δ*/h*, where δ*and h*are the Stokes-layer thickness and the half height of the channel, respectively. However, their vorticities are different. The vorticity of the most unstable mode is symmetric, while the other is asymmetric. The Stokes-layer interactions have a destabilizing effect on the most unstable mode when δ lizing effect when δ > 0.68. However, the interactions always have a stabilizing effect on the other unstable mode. It is explained that one of the two unstable modes has much higher dissipation than the other one when the Stokes-layer interactions are strong. We also find that the stability of the Stokes layer is closely related to the inflectional points of the base-flow velocity profile. The effects of inconsistent velocity-amplitude, initial phase, and frequency of the osc.l.ations on the stability are analyzed. The energy of the most unstable eigenvector is mainly distributed near the plate of higher velocity amplitude or higher osc.l.ation frequency. The effects of the initial phase difference are complicated because the base-flow velocity is extremely sensitive to the initial phase.

关键词： finite Stokes layer instantaneous stability Stokes-layer interaction asynchronous osc.l.ation

Degradation and resynthesis of c.l.rophyll during increased oxidative stress and prolonged darkness differ between annual and perennial flax(linum l.)

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Oil crop Science 2024年第2期9卷 121-130页

作者： Kenyon J. Nisbett Abida Alokozai Su Hyun Elizabeth Ko G. Adam Mott Jason c.l. Browna Department of Biologic.l.Sciences University of Toronto ScarboroughTorontoONCanada Department of c.l.&Systems Biology University of TorontoTorontoONCanada centre for the Analysis of Genome Evolution&Function University of TorontoTorontoONCanada

Among plants,there is considerable variation in lifespan:annuals live less than one year,whereas perennials live for several years,with the longest-living perennial having survived 43,600 *** proposed by the Disposable Soma Theory,this lifespan variation among plants likely reflects differential investment of limited energy and nutrient resources,with perennials investing more energy and nutrients into biomolec.l.r maintenance compared to annuals in order to ensure persistence over multiple *** differential investment may be partic.l.rly important during periods of exogenous stress,which are known to acc.l.rate biomolec.l.r *** present study evaluated this hypothesis using annual and perennial flax(linum l.)subjected to two exogenous stressors—increased oxidative stress(i.e.,foliar H2O2spraying)and complete prolonged *** c.l.rophyll has been shown to exhibit degradation in response to changes in environmental conditions,we utilized changes in c.l.rophyll levels during and after periods of exogenous stress to evaluate our *** predicted that i)perennials would exhibit a slower rate of c.l.rophyll degradation during exposure to exogenous stressors compared to annuals,and ii)perennials would exhibit a faster rate of c.l.rophyll resynthesis following such exposure compared to *** levels before,during,and after exposure to both exogenous stressors were measured in two separate trails,once using image c.l.ur analysis and once using *** c.l.rophyll degradation rates in response to oxidative stress did not differ between annuals and perennials,contrary to our predictions,c.l.rophyll resynthesis rates following such exposure were significantly higher in perennials,as *** plants were subjected to complete prolonged darkness,c.l.rophyll degradation rates were significantly lower in perennials than annuals,as predicted;however,when plants were subsequently reintroduced to natural photoperiod,ch

关键词： Ageing life history Maximum lifespan Oxidative stress Somatic maintenance

Dual Additives for Stabilizing li Deposition and SEI Formation in Anode-Free li-Metal Batteries

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Energy & Environmental Materials 2024年第3期7卷 84-92页

作者： Baolin Wu chunguang chen Dmitri l.Danilov Zhiqiang chen Ming Jiang Rüdiger-A.Eichel Peter H.l.Notten Forschungszentrum Jülich(IEK-9) D-52425Jülich Germany RWTH Aachen University D-52074Aachen Germany lNM Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China Eindhoven University of Technology P.O.Box 5135600 MBEindhoven The Netherlands School of Electronics and Information Institute of Carbon Neutrality and New EnergyHangzhou Dianzi UniversityHangzhou 310018China University of Technology Sydney BroadwaySydney NSW 2007Australia

Anode-free li-metal batteries are of significant interest to energy storage industries due to their intrinsic.l.y high ***,the accumulative li dendrites and dead li continuously consume active li during *** results in a short lifetime and low coulombic efficiency of anode-free li-metal *** effective electrolyte additives can improve the li deposition homogeneity and solid electrolyte interphase(SEI)stability for anode-free li-metal ***,we reveal that introducing dual additives,composed of liAsF6 and fluoroethylene carbonate,into a low-cost commercial carbonate electrolyte will boost the cycle life and average coulombic efficiency of NMc‖cu anode-free li-metal *** NMc‖cu anode-free li-metal batteries with the dual additives exhibit a capacity retention of about 75%after 50 cycles,much higher than those with bare electrolytes(35%).The average coulombic efficiency of the NMc‖cu anode-free li-metal batteries with additives can maintain 98.3%over 100 *** contrast,the average coulombic efficiency without additives rapidly decline to 97%after only 50 *** situ Raman measurements reveal that the prepared dual additives fac.l.tate denser and smoother li morphology during li *** dual additives significantly suppress the li dendrite growth,enabling stable SEI formation on anode and cathode *** results provide a broad view of developing low-cost and high-effective functional electrolytes for high-energy and long-life anode-free li-metal batteries.

关键词： anode-free lithium metal battery dual additives in situ Raman li growth SEI formation

Mass spectrometry-based proteomics technology in pancreatic cancer research

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胰腺病学杂志(英文) 2024年第2期07卷 145-163页

作者： Sun Xue Wang Siyuan Wong catherine c.l. First School of clinic.l.Medicine Peking University Health Science Center Peking University Beijing China School of Pharmacy University of Wisconsin-Madison Madison Wisconsin United States State Key laboratory of complex Severe and Rare Diseases Clinical Research Institute Peking Union Medical College Hospital Chinese Academy of Medical Science &amp Peking Union Medic.l.c.l.ege Beijing China Tsinghua-Peking University Joint center for life Sciences Tsinghua University Beijing China

Pancreatic ductal adenocarcinoma (PDAc) has become a significant health concern with increasing incidence and mortality rates over the past few decades. Researchers have turned their attention to cutting-edge mass spectrometry (MS) technology due to its high-throughput and accurate detection capacity, which plays a vital role in understanding the mechanisms and discovering biomarkers for pancreatic diseases. In this review, we comprehensively investigate various methodologies of quantitative and qualitative proteomics MS technologies, alongside bioinformatic.l.platforms employed in pancreatic cancer research. The integration of these optimized approaches provides novel insights into the molec.l.r mechanisms underlying tumorigenesis and disease progression, ultimately fac.l.tating the discovery of potential diagnostic, prognostic biomarkers, and therapeutic targets. The robust MS-based strategy shows promise in paving the way for early diagnosis and personalized medicine for pancreatic cancer patients.

关键词： Biomarkers Mass spectrometry Pancreatic cancer Pancreatic ductal adenocarcinoma Proteomics

Water quality, habitat, and fish assemblage relationships in middle-order agric.l.ure and forest streams of the Mississippi Alluvial Plain

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Ec.l.gic.l.Processes 2024年第1期13卷 217-236页

作者： Matthew l.Skoog Michael A.Eggleton Yushun chen Department of Aquac.l.ure and Fisheries University of Arkansas at Pine Bluff Minnesota Department of Natural Resources State Key laboratory of Freshwater Ec.l.gy and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of chinese Academy of Sciences

Background Agric.l.ure has greatly influenced water quality, habitats, and fish assemblages in streams of the Mississippi Alluvial Plain(MAP) ecoregion. However, MAP streams have historic.l.y been understudied compared to streams in other agric.l.ural regions of the USA. In this study, water quality, habitat, and fish assemblage composition were assessed seasonally(spring, summer, and fall) in eight representative MAP streams located across three U.S. states. The study design included four streams containing highly agric.l.ural watersheds(herein termed “agric.l.ure” streams) and four streams containing mostly forested watersheds(herein termed “forest” streams), which were intended to represent reference conditions for MAP *** In general, forest streams contained significantly better instream and riparian habitats than agric.l.ure streams(P = 0.010–0.040) whereas agric.l.ure streams contained significantly greater levels of primary nutrients(P ces between agric.l.ure and forest streams with respect to other physic.l.and chemic.l.variables were intermittent and season dependent. Fish assemblages in agric.l.ure and forest streams were structured primarily along an environmental gradient reflecting instream habitat conditions, water nutrient concentrations, and benthic c.l.rophyll-a production. Structurally, fish assemblages in both stream types contained many regionally common species, though some species appeared to exhibit affinities for a partic.l.r stream type. Functionally, fish assemblages in agric.l.ure streams contained more tolerant species, more omnivores, and fewer insectivores compared to forest stream assemblages, which were nearly all insectivores. Overall, one-third of the fish specimens c.l.ected in forest streams classified as intolerant *** Our results suggested that stream water quality, habitat, and fish assemblages differed between agric.l.ure and forest streams in the MAP, with fish assemblages e

关键词： Agric.l.ure Stream land use Water quality Habitat Fish Multivariate statistics Mississippi Alluvial Plain

cRISPR/cas9-mediated NlInR2 mutants:Analyses of residual mRNA and truncated proteins

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Journal of Integrative Agric.l.ure 2024年第6期23卷 2006-2017页

作者： Jun lü Jingxiang chen Yutao Hu lin chen Shihui li Yibing Zhang Wenqing Zhang State Key laboratory of Biocontrol/School of life Sciences Sun Yat-sen UniversityGuangzhou 510275China Development of Food Science and Engineering Moutai InstituteRenhuai 564507China

cRISPR/cas9 technology is a powerful genome manipulation tool in ***,little is known about whether mRNA and protein of a target gene are completely cleared in homozygous *** study generated homozygous mutants of the insulin receptor gene 2(NlInR2)in the brown planthopper(Nilaparvata lugens)using cRISPR/cas9 genome *** frameshift mutants,E5_D17 and E6_I7,differentiated towards long wings,but there were differences in wing morphology,with E5_D17 showing wing *** investigations revealed the presence of residual expression of NlInR2 mRNA in both mutants,as well as the occurrence of spliceosomes featuring exon skipping splicing in E5_***,the E5_D17 exhibited the detection of N-terminally truncated NlInR2 *** interference experiments indicated that the knockdown of NlInR2 expression in the E5_D17 mutant line increased the proportion of wing deformities from 11.1 to 65.6%,suggesting that the residual NlInR2 mRNA of the E5_D17 mutant might have retained some genetic *** results imply that systematic characterization of residual protein expression or function in cRISPR/cas9-generated mutant lines is necessary for phenotypic interpretation.

关键词： cRISPR/cas9 Nilaparvata lugens residual mRNA skipping exon truncated protein