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Consensus for high-order multi-agent systems with communication delay

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science China(Information sciences) 2017年第9期60卷 241-252页

作者： Zhenhua WANG Huanshui ZHANG Minyue FU Huaxiang ZHANG School of Information science and Engineering Shandong Normal University institute of Data science and Technology Shandong Normal University School of Control science and Engineering Shandong University School of Electrical Engineering and Computer science University of Newcastle School of Automation Guangdong Key Laboratory of Io T Information TechnologyGuangdong University of Technology

In this study, consensus problem for general high-order multi-agent systems with communication delay is investigated. Given the unstable agent dynamics and a known communication delay, two consensus protocols are designed to guarantee consensus over undirected network. By jointly researching the effects of agent dynamics and network topology, allowable delay bounds depending on the maxima of concave functions are easy to calculate. Especially, the maximum delay bound is derived when the network topology is completely connected. The main approach for the same involves designing the control gains on the basis of the solution of a parametric algebraic Riccati equation. Finally, the theoretical results are demonstrated via numerical simulations.

关键词： consensus communication delay historical input information parametric algebraic Riccati equa tion eigenratio

Effects of pre-aging on microstructure evolution and deformation mechanisms of hot extruded Mg–6Zn–1Gd–1Er Mg alloys

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Journal of Magnesium and Alloys 2023年第1期11卷 317-328页

作者： Wei Kang Liwei Lu Longbiao Feng Fengchi Lu Chunlei Gan Xiaohui Li School of Materials science and Engineering Hunan University of Science and TechnologyXiangtan 411201PR China guangdong institute of Materials and Processing Guangdong Academy of SciencesGuangzhou 510650PR China School of Mechatronics Engineering and Automation Foshan UniversityFoshan 528000PR China guangdong Tsing Impulse science and Technology Co.Ltd. Foshan 528226PR China

The influence of pre-aging treatment on the microstructure,texture and mechanical properties of the Mg–6Zn–1Gd–1Er(wt.%)alloy was *** microstructure analysis shows that the presence of pre-aging is beneficial to{1012}twin nucleation at the early stage of extrusion and inhibits the growth of twins and promotes the formation of[1010]-fiber texture components,thus accelerating the complex process of *** the middle stage of extrusion,the extruded samples under the condition of solid solution were subjected to dynamic precipitation during severe shear *** precipitation of the second phase particles followed the particle stimulating nucleation(PSN)mechanism,which increased the volume fraction of DRX grains during *** the extruded samples under the peak-aged condition,the particles appear dissolved during the severe shear deformation strain,which slows down the DRX *** the later stage of extrusion,the small rod-shaped particles followed the PSN mechanism,and finally formed the strong fiber *** extruded alloy exhibits the strongest mechanical properties under the peak-aged state,with ultimate tensile strength(UTS)of 346 MPa,tensile yield strength(TYS)of 217 MPa,and elongation to failure(EL)of 13.6%.The improvement of mechanical properties is mainly attributed to the existence of strong fiber texture,small rod-shaped and block-shaped phases.

关键词： Mg alloys Pre-aging Extrusion Texture Dynamic recrystallization

Constructing the Ontology for Modeling the Fish Production in Pearl River Basin

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Journal of Integrative Agriculture 2012年第5期11卷 760-768页

作者： HE Qi-yun ZHENG Ye-lu XU Jian-ning institute of science and Technology Information Guangdong Academy of Agricultural SciencesGuangzhou 510640P.R.China

This paper puts forward a construction method based on ontology for the Pearl River Basin fish production, to facilitate the domain knowledge analysis and information retrieval. By converting the concepts and terms in domain ordinally, the fish production ontology was constructed with the definition of classes, properties, instances, and relationships. The developed ontology model of the fish production knowledge is proposed and applied in the system of fish diseases diagnosis primarily. The research lays the semantic foundation for the further efficient knowledge management and practical application.

关键词： fish production knowledge ontology modeling the Pearl River Basin

Study on the Physiological,Cellular,and Morphological Aspects of the Postharvest Development of Cut Lily Flowers

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Horticultural Plant Journal 2021年第2期7卷 149-158页

作者： Yushan Zhang Dexin Zhong Zhanfei Liu Jiawei Gao College of Materials and Food University of Electronic Science and Technology of ChinaZhongshan InstituteZhongshanGuangdong 528400China

It is of great practical significance to study the development process of cut lily for regulating flowering and *** this study,the developmental process of lily cut flower was explored from cellular,morphological,and physiological *** morphological aspect,the tepal edge grows faster than the *** midrib groove of the flowering stage is wider than that of bud *** fast-growing edge of the petals results in the midrib bending ***,the rapid growth of the stamens and stigmas also contributes to bud *** the cellular aspect,in the bud stage there were more wrinkles in the outer epidermal cell wall of the tepal than those in the inner epidermal cell wall,indicating that asymmetric structural differences exist from the beginning of lily *** a physiological aspect,from the bud cracking stage to the senescence stage,a variety of substances in the tepal cells gradually decreased,including total nitrogen,total phosphorus,total potassium,total calcium,starch,soluble sugar,and soluble protein,but not *** results indicate that the asymmetric growth caused by this structural difference is responsible for *** wrinkles in the cell wall can be regarded as indicators of senescent cells and are caused by the degradation of the cell wall and the loss of intracellular turgor *** differences in the epidermal cells between the inner and outer tepal indicated ultrastructural changes in the tepal *** bud and flowering stages are maintained by the tepals acting as a *** flowering,the tepals gradually change from a sink to a source *** of the cut lily flowers was caused by the decomposition of intracellular compounds in the tepals and the remobilization of nutrients from the tepals to the developing organs.

关键词： cut lily epidermal cell midrib tepal wrinkle

Atmospheric VOCs in an industrial coking facility and the surrounding area:Characteristics,spatial distribution and source apportionment

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Journal of Environmental sciences 2024年第4期138卷 660-670页

作者： Meicheng Wen Weiqiang Deng Jin Huang Shu Zhang Qinhao Lin ChaoWang Shengtao Ma Wanjun Wang Xin Zhang Guiying Li Taicheng An guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlInstitute of Environmental Health and Pollution controlGuangdong University of TechnologyGuangzhou 510006China guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment Guangzhou Key Laboratory of Environmental Catalysis and Pollution ControlSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China institute of Environmental science Shanxi UniversityTaiyuan 030006China

Industrial coking facilities are an important emission source for volatile organic compounds(VOCs).This study analyzed the atmospheric VOC characteristics within an industrial coking facility and its surrounding *** concentrations of total VOCs(TVOCs)in the surrounding residential activity areas(R1 and R2),the coking facility(CF)and the control area(CA)were determined to be 138.5,47.8,550.0,and 15.0μg/m^(3),*** cold drum process and coking and quenching areas within the coking facility were identified as the main polluting *** spatial variation in VOCs composition was analyzed,showing that VOCs in the coking facility and surrounding areas were mainly dominated by aromatic compounds such as BTX(benzene,toluene,and xylenes)and naphthalene,with concentrations being negatively correlated with the distance from the coking facility(p<0.01).The sources of VOCs in different functional areas across the monitoring area were analyzed,finding that coking emissions accounted for 73.5%,33.3% and 27.7% of TVOCs in CF,R1 and R2,*** results demonstrated that coking emissions had a significant impact on VOC concentrations in the areas surrounding coking *** study evaluates the spatial variation in exposure to VOCs,providing important information for the influence of VOCs concentration posed by coking facility to surrounding residents and the development of strategies for VOC abatement.

关键词： Coking facility Volatile organic compounds Emission inventory Spatial distribution Source apportionment

High energy density and superior charge/discharge efficiency polymer dielectrics enabled by rationally designed dipolar polarization

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Journal of Materiomics 2023年第3期9卷 601-608页

作者： Zizhao Pan Yupeng Pan Li Li Xinwei Xu Jiufeng Dong Fei Jin Liang Sun Yujuan Niu Chen Xu Hong Wang Department of Materials science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices&guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen518055GuangdongChina Shenzhen Grubbs institute and Department of Chemistry Southern University of Science and TechnologyShenzhen518055GuangdongChina

Although many dielectric polymers exhibit high energy storage density(Ue)with enhanced dipolar polarization at room temperature,the substantially increased electric conduction loss at high applied electric fields and high temperatures remains a great ***,we report a strategy that high contents of medium-polar ester group and end-group(St)modification are introduced into a biode-gradable polymer polylactic acid(PLA)to synergistically reduce the loss and enhance Ue and charge-discharge efficiency(h).The resultant St-modified PLA polymer(PLA-St)exhibits an Ue of 6.5 J/cm^(3)with an ultra-high h(95.4%),far outperforming the best reported dielectric *** is worth noting that the modified molecular structures can generate deep trap centers and restrict the local dipole motions in the polymer,which are responsible for the reduction of conduction loss and improvements in high-temperature capacitive *** addition,the PLA-St polymer shows intrinsically excellent self-healing ability and cyclic stability surviving over 500000 charge-discharge *** work offers an efficient route to next-generation eco-friendly dielectric polymers with high energy density,low loss,and long-term stability.

关键词： Dielectric polymers Enhanced dipolar polarization End-group modification Self-healing ability Long-term stability

Finite-Time Stability and Instability of Nonlinear Impulsive Systems

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Advances in Applied Mathematics and Mechanics 2023年第1期15卷 49-68页

作者： Guihua Zhao Hui Liang College of science University of Shanghai for Science and TechnologyShanghai200093China School of science Harbin Institute of TechnologyShenzhenGuangdong 518055China

In this paper,the finite-time stability and instability are studied for nonlinear impulsive *** are mainly four concerns.1)For the system with stabilizing impulses,a Lyapunov theorem on global finite-time stability is presented.2)When the system without impulsive effects is globally finite-time stable(GFTS)and the settling time is continuous at the origin,it is proved that it is still GFTS over any class of impulse sequences,if the mixed impulsive jumps satisfy some mild conditions.3)For systems with destabilizing impulses,it is shown that to be finite-time stable,the destabilizing impulses should not occur too frequently,otherwise,the origin of the impulsive system is finite-time instable,which are formulated by average dwell time(ADT)conditions respectively.4)A theorem on finite-time instability is provided for system with stabilizing *** each GFTS theorem of impulsive systems considered in this paper,the upper boundedness of settling time is given,which depends on the initial value and impulsive *** numerical examples are given to illustrate the theoretical analysis.

关键词： Impulsive systems finite-time stability finite-time instability nonlinear systems

Accurate and rapid image segmentation method for bayberry automatic picking via machine learning

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International Journal of Agricultural and Biological Engineering 2023年第6期16卷 246-254页

作者： Huan Lei Chentong Li Yu Tang Zhenyu Zhong Zeyu Jiao institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou 510070China guangdong Key Laboratory of Modern Control Technology Institute of Intelligent ManufacturingGuangdong Academy of ScienceGuangzhou 510070China School of Automation Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Due to the short ripening period and complex picking environment,bayberry generally relies on mechanical equipment for picking,especially the automatic picking system guided by ***,it is crucial to locate the bayberry in the view accurately and *** efforts have been made,the existing methods are difficult to implement due to the limited amount of data and the processing *** this study,an accurate and rapid segmentation method based on machine learning was proposed to address this ***,the images collected by the visual guidance system were pre-processed by contrast-limited adaptive histogram equalization(CLAHE)based on the Y component of the YUV color *** advantage of the color difference map of RB and RG for the segmentation of different colors,an adaptive color difference map foreground segmentation method was then adopted for bayberry region foreground ***,distance transforms and marking control watershed methods were exploited to achieve single bayberry fruit ***,with the help of the convex hull theory and fruit shape characteristics,the irregular background interference areas were filtered out,which improved the accuracy of bayberry segmentation *** experimental results show that this method can achieve better segmentation of bayberry in complex orchard environment with an accuracy of 97.4%and only takes 0.136 s to calculate once.

关键词： bayberry image segmentation machine learning automatic picking computer vision

Creation of Transgenic Bananas Expressing Human Lysozyme Gene for Panama Wilt Resistance

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Journal of Integrative Plant Biology 2005年第8期47卷 971-977页

作者： Xin-Wu PEI Shi-Kai CHEN Rui-Ming WEN Shang YE Jia-Qin HUANG Yong-Qiang ZHANG Bing-Shan WANG Zhi-Xing WANG Shi-Rong JIA Biotechnology institute Chinese Academy of Agricultural Sciences Beijing 100081 China Xinyi institute of Agricultural science and Technology Xinyi Guangdong 523530 China

Human lysozyme （HL） inhibits Fusarium oxysporum （FocR4） growth in vitro. To obtain transgenic bananas （Musa spp.） that are resistant to Panama wilt （F. oxysporum）, we introduced an HL gene that is driven by a constitutive cauliflower mosaic virus 35S promoter into the banana via Agrobacteriummediated transformation. PCR confirmed that 51 transgenic plants were obtained. The development of Panama wilt symptoms were examined after the plants had been grown in pots. The non-transgenic plants developed typical fusarium symptoms 60 d after FocR4 inoculation, whereas 24 of 51 transgenic plants remained healthy. The transgenic banana plants that showed resistance to FocR4 in the pots were then planted in a field that was heavily infected with FocR4 for further investigation. Eleven of 24 plants devel- oped symptoms before bud emergence; another 11 plants showed symptoms after bud emergence and the remaining two plants, H-67 and H-144, remained healthy and were able to fruit. Northern blotting analysis demonstrated that H-67 and H-144, bearing the strongest resistance to Panama wilt, had the highest level of HL expression and that the expression of HL was well correlated with the FocR4 resistance of transgenic plants. We conclude that Agrobacterium-mediated transformation, with the assistance of particle bombardment, is a powerful approach for banana transformation and that a transgenic HL gene can cause resistance of the crop to FocR4 in the field.

关键词： Agrobacterium-mediated transformation Fusarium oxysporum human lysozyme Panamawilt disease particle bombardment transgenic banana.