检索结果-南通市图书馆

Exponential synchronization of general chaotic delayed neural networks via hybrid feedback

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第2期9卷 262-270页

作者： mei-qin liu Jian-hai ZHANG School of Electrical Engineering Zhejiang University Hangzhou 3 10027 China

This paper investigates the exponential synchronization problem of some chaotic delayed neural networks based on the proposed general neural network model,which is the interconnection of a linear delayed dynamic system and a bounded static nonlinear operator,and covers several well-known neural networks,such as Hopfield neural networks,cellular neural networks(CNNs),bidirectional associative memory(BAM)networks,recurrent multilayer perceptrons(RMLPs).By virtue of Lyapunov-Krasovskii stability theory and linear matrix inequality(LMI)technique,some exponential synchronization criteria are *** the drive-response concept,hybrid feedback controllers are designed to synchronize two identical chaotic neural networks based on those synchronization ***,detailed comparisons with existing results are made and numerical simulations are carried out to demonstrate the effectiveness of the established synchronization laws.

关键词： Exponential synchronization Hybrid feedback Drive-response conception Linear matrix inequality (LMI) Chaotic neural network model

Research on System Dynamic of Buying Work Safety Services in Small and Medium-Sized Enterprises

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2021年第3期30卷 339-362页

作者： Suxia liu Hangfeng Li Qiang mei School of Management Jiangsu UniversityZhenjiang212013China

Buying work safety services from intermediaries is a new and important approach to improve the work safety in small and medium-sized enterprises(SMEs).The existing literature addresses the significance and effectiveness of the service model but it ignores the dynamic game relationship between relevant stakeholders when SMEs choose to purchase the services under bounded ***,this study aims to analyse this dynamic game relationship based on evolutionary game ***,dynamic simulations of the evolutionary game model are applied to determine the impact of major factors for three stakeholders(SMEs,governments,and safety service agents),examine stability strategies,and identify modes of equilibrium under different subsidy *** results of simulation are as ***,the results explain that how the major factors(service price,the quality of service,government subsidy,etc.)affect the system dynamic force of buying work safety ***,when the subsidy strategy is static payment,the selection of the stakeholders fluctuates and is not ***,when the subsidy strategy is a dynamic payment,the evolutionary game process converges to a stable state,which indicates that an evolutionarily stable strategy exists under the dynamic subsidy ***,the stable state and equilibrium values are not affected by the different initial *** results of this study offer a certain reference for the government to guide the implementation of the purchase of work safety or other services in SMEs.

关键词： Small and medium-sized enterprises(SMEs) work safety services evolutionary game theory system dynamics

Generalized Lanchester warfare model characterized by information asymmetry effect

维普期刊数据库评论

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 Systems Engineering and Electronics 2017年第2期28卷 315-321页

作者： Weiwen Hu Dan mei Yongkai liu College of Science Naval University of Engineering Wuhan 430033 China

Combined with the fact that information asymmetry between two belligerent parties is very common in information-based warfare, the bidirectional influence of asymmetric information on both sides is analyzed. A new damage coefficient is formed based on the analysis, and a generalized Lanchester warfare model characterized by information asymmetry effect is built. According to the staggered transformation of information asymmetric degree resulting from the changing tactic of both sides by turns, a method for approximate solution of the model is presented by translating the information asymmetric degree as a ladder function, and both examples of the solving model and further discussion about the solution are given. The results indicate that the model can serve as a reference to analyze and forecast the course of war quantitatively. © 2017 Beijing Institute of Aerospace Information.

关键词： Electronics industry Engineering Industrial engineering

Nonuniform Three-dimensional Configuration Distributed SAR Signal Reconstruction Clutter Suppression

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2012年第3期25卷 423-429页

作者： liu mei ZHANG Lei LI Chenlei School of Electronics Information Engineering Harbin Institute of TechnologyHarbin 150001China

This paper deals with the problem of clutter suppression in spaceborne distributed synthetic aperture radar （D-SAR） with nonuniform three-dimensional （3D） configuration geometry. In order to make a breakthrough of the configuration limitation of the traditional space time adaptive processing （STAP） based on uniform array and improve the inhomogeneous clutter suppres- sion performance, this paper considers signal reconstrtiction technique using array interpolation to process the D-SAR signal. An array interpolation signal reconstruction method based on pitching-partition is derived then a signal reconstruction 3D-STAP clutter suppression method applied to nonuniform 3D configuration is proposed. In particular, the proposed method is compared with conventional methods and the performance analysis is carried out based on simulations. The improvement factor （IF） for clutter suppression is imported and reported as a benchmark on the clutter suppression effect.

关键词： distributed synthetic aperture radar nonunitform 3D configuration clutter suppression signal reconstruction STAP

Modeling and Analysis of Matthew Effect Under Switching Social Networks via Distributed Competition

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第7期9卷 1311-1314页

作者： mei liu Suibing Li Long Jin School of Information Science and Engineering Lanzhou UniversityLanzhou 730000 State Key Laboratory of Tibetan Intelligent Information Processing and Application Xining 810016China IEEE

Dear editor,This letter models and analyzes the Matthew effect under switching social networks via distributed competition.A competitive strategy is leveraged to trace the evolution of individuals in social systems under the Matthew *** addition,a consensus filter is utilized to decentralize the model with undirected graphs used to describe the interactions among individuals in social ***,a term is added to the dynamic consensus filter to compensate for the influence of the switching of communication networks on the *** this letter,the convergence of the proposed Matthew effect model is theoretically proved,and simulative experiments are conducted to verify the availability of the *** particular,this letter points out the state and evolution of each individual in social systems with distributed competition,and the influence of the social environment on the development of individuals is also intuitively displayed.

关键词： effect. letter intuitive

Effects of molybdenum on nutrition, quality, and flavour compounds of strawberry (Fragaria×ananassa Duch. Cv. Akihime) fruit

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第7期16卷 1502-1512页

作者： liu Li XIAO Wei JI mei-ling YANG Chao LI Ling GAO Dong-sheng FU Xi-ling State Key Laboratory of Crop Biology College of Horticulture Science and Engineering Shandong Agricultural University

Molybdenum （Mo） is an essential trace element in plant nutrition and physiology. It affects photosynthesis and photosyn- thate accumulation, therefore also affecting fruit quality and nutritional content. This study assessed the effects of different sodium molybdate （Na2MoO4） concentrations on strawberry. Five different Mo concentrations were applied in this experi- ment, including 0, 67.5, 135, 168.75, 202.5 g ha-1, respectively. The mineral concentration, including nitrogen （N）, Mo, iron （Fe）, copper （Cu）, and selenium （Se） was assessed in strawberry fruit, as well as chlorophyll content, nutrition quality, taste and aroma. Results showed that net photosynthetic rate （Pn） and chlorophyll content for the strawberry plants increased with an increase in Mo concentration; and the contents of N, Mo, Fe, Cu, total soluble solids （TSS）, titratable acidity （TA）, sweetness, some sugars, organic acids, and some volatile compounds in the fruit all increased, as well. However, the Mo concentration did not significantly affect the concentrations of Se, sucrose, lactic acid, acetic acid, and some aroma compounds. Fruit sprayed with 135 g ha-1 Mo exhibited the highest TSS and sweetness values, as well as the highest N and Fe concentrations among all the treatments. P value and chlorophyll content, fructose, glucose, sorbitol and total sugar contents in fruit supplied with 135 g ha-1 Mo were also higher than that in other treatments. Fruit sprayed with a Mo concentration of 67.5 g ha-1 exhibited significantly higher ascorbic acid （AsA） values than that of control. Ninety-seven volatile compounds were identified in fruit extracted by head-space solid-phase microextraction （HS-SPME） coupled with gas chromatography-mass spectrometry （GC-MS）. Fruits sprayed with 135 g ha-1 Mo had the highest concentrations of six characteristic aroma compounds, including methyl butanoate, y-decalactone, ethyl butanoate, methyl hexanoate, y-do- decalactone, and ethyl caproate.

关键词： strawberry molybdenum nutrition volatile compounds flavour

Structural roles of lipid molecules in the assembly of plant PSⅡ-LHCⅡ supercomplex

在线全文

学校读者我要写书评

暂无评论

Biophysics Reports 2018年第4期4卷 189-203页

作者： Xin sheng Xiuying liu Peng Cao mei Li Zhenfeng liu National Laboratory of Biomacromolecules CAS Center for Excellence in Biomacromolecules Institute of Biophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

In plants, photosystem Ⅱ(PSⅡ) associates with light-harvesting complexes Ⅱ(LHCⅡ) to form PSⅡ-LHCⅡ supercomplexes. They are multi-subunit supramolecular systems embedded in the thylakoid membrane of chloroplast, functioning as energy-converting and water-splitting machinery powered by light energy. The high-resolution structure of a PSⅡ-LHCⅡ supercomplex, previously solved through cryo-electron microscopy, revealed 34 well-defined lipid molecules per monomer of the homodimeric system. Here we characterize the distribution of lipid-binding sites in plant PSⅡ-LHCⅡ supercomplex and summarize their arrangement pattern within and across the membrane. These lipid molecules have crucial roles in stabilizing the oligomerization interfaces of plant PSⅡ dimer and LHCⅡ trimer. Moreover,they also mediate the interactions among PSⅡ core subunits and contribute to the assembly between peripheral antenna complexes and PSⅡ core. The detailed information of lipid-binding sites within PSⅡ-LHCⅡ supercomplex may serve as a framework for future researches on the functional roles of lipids in plant photosynthesis.

关键词： Light-harvesting complex II Lipid Membrane protein Photosynthesis Photosystem II

Laser direct writing of flexible multifunctional airflow sensors on the Kevlar fabric

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 443-454页

作者： Wei Wang Zi-Qing Chen Yong-Qi Li Yu-Long Wang mei-Chen liu Yun-Bo Ruan Yang Zhang Shu-Juan liu Qiang Zhao College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory of Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Zhe Jiang Topsun Logistic Control CO. LTD.Yuhuan 317600China Department of Rehabilitation Medicine School of Acupuncture-Moxibustion and Tuina and School of Health Preservation and RehabilitationNanjing University of Chinese MedicineNanjing 210023China

The growing interest in flexible devices has emerged as a global trend due to their advantages in flexibility,lightweight structure,and wearability,addressing the limitations of traditional *** wearable airflow sensors have been previously reported,the development of flexible fabric-based airflow sensors capable of functioning in environments with open flames—critical for fire rescue operations—has yet to be explored,largely due to the poor fire resistance of conventional *** this work,we first present a flexible,wearable,and multifunctional airflow sensor with excellent fire-resistant properties,fabricated through a simple direct laser writing *** sensor maintains airflow detection capabilities even in the presence of open ***,the fabrication of fabric-based sensors involves complex procedures such as carbon materials doping or vapor-phase deposition,leading to lengthy preparation cycles and high ***,fabric-based devices are inherently prone to *** address these challenges,we introduce twice-vertical laser-induced graphene(TVLIG)as a sensitive and reliable component for fire-resistant airflow *** resulting TVLIG/Kevlar fabric can be integrated into various garments,particularly protective suits,to form sensitive and fire-resistant airflow sensors capable of detecting airflow velocity and direction in both two-dimensional(2D)and three-dimensional(3D)spaces during fire ***,the TVLIG patterns can be expanded to multifunctional platforms,such as glucose detection for injured individuals,offering further applications in rescue *** functional expansion reduces the burden on rescue personnel and streamlines device *** its outstanding sensing capabilities,fire resistance,and expandability,the developed flexible airflow sensor shows great potential for various real-world rescue scenarios,promising advancements in wearable sensing technology for rescue enginee

关键词： flexible airflow sensor direct laser writing twice-vertical laser-induced graphene fire accident rescue Kevlar fabric

Dynamics of an ultrasound contrast agent microbubble near spherical boundary in ultrasound field

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第11期28卷 204-209页

作者： Ji-Wen Hu Lian-mei Wang sheng-You Qian Wen-Yi liu Ya-Tao liu Wei-Rui Lei School of Mathematics and Physics University of South ChinaHengyang 421001China School of Physics and Electronics Hunan Normal UniversityChangsha 410081China

The goal of this article is to establish the conditions of excitation where one has to deal with ultrasound contrast agent(UCA) microbubbles pulsating near biological tissues with spherical boundary in ultrasound field for targeted drug delivery and cavitation-enhanced thrombolysis, etc., and contributes to understanding of mechanisms at play in such an interaction. A modified model is presented for describing microbubble dynamics near a spherical boundary(including convex boundary and concave boundary) with an arbitrary-sized aperture angle. The novelty of the model is such that an oscillating microbubble is influenced by an additional pressure produced by the sound reflection from the boundary wall. It is found that the amplitude of microbubble oscillation is positively correlated to the curve radius of the wall and negatively correlated to the aperture angle of the wall and the sound reflection coefficient. Moreover, the natural frequency of the microbubble oscillation for such a compliable wall increases with the wall compliance, but decreases with the reduction of the wall size, indicating distinct increase of the natural frequency compared to a common rigid wall. The proposed model may allow obtaining accurate information on the radiation force and signals that may be used to advantage in related as drug delivery and contrast agent imaging.

关键词： ultrasound contrast agent(UCA) microbubble spherical boundary ultrasound natural frequency