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Control synthesis of linear distributed parameter switched systems

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Journal of Systems Engineering and Electronics 2015年第3期26卷 565-572页

作者： Leping Bao Shumin Fei lin chai School of Automation Southeast University Department of Automation Taiyuan Institute of Technology

The control synthesis for switched systems is extended to distributed parameter switched systems in Hilbert space. Based on semigroup and operator theory, by means of multiple Lyapunov method incorporated average dwell time approach, sufficient con- ditions are derived in terms of linear operator inequalities frame- work for distributed parameter switched systems. Being applied to one dimensional heat propagation switched systems, these lin- ear operator inequalities are reduced to linear matrix inequalities subsequently. In particular, the state feedback gain matrices and the switching law are designed, and the state decay estimate is explicitly given whose decay coefficient completely depends on the system＇s parameter and the boundary condition. Finally, two numerical examples are given to illustrate the proposed method.

关键词： distributed parameter switched systems multiple Lya-punov method stabilization linear operator inequalitie average dwell time.

Semi-Global Stabilization via Homogeneous Output Feedback for a Class of Nonlinear Time-Delay Systems

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Journal of Systems Science & Complexity 2016年第6期29卷 1538-1552页

作者： WANG Pan chai lin FEI Shumin Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast University

The semi-global stabilization problem for a class of nonlinear systems with state time-delay is addressed in this paper. By using Lyapunov-Krasovskii functional method and homogeneous dom- ination approach, a homogeneous observer and an output feedback controller with a scaling gain are designed. Then the sealing gain is adjusted such that the closed-loop system is semi-global asymptoti- cally stable. A numerical example is presented to illustrate the effectiveness of the obtained results in this paper.

关键词： Homogeneous domination approach Lyapunov-Krasovskii functional nonlinear time-delay systems output feedback semi-global.

Dynamics and synchronization of a complex-valued star network

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Science China(Technological Sciences) 2021年第12期64卷 2729-2743页

作者： chai lin LIU Jian CHEN GuanRong ZHAO Xiu School of Mathematical Sciences University of JinanJinan 250022China Department of Electrical Engineering City University of Hong KongHong KongChina

Complex networks have been extensively investigated in recent ***,the dynamics,especially chaos and bifurcation,of the complex-valued complex network are rarely *** this paper,a star network of coupled complex-valued van der Pol oscillators is proposed to reveal the mechanism of star *** the aid of bifurcation diagram,Lyapunov exponent spectrum and phase portrait in this study,chaos,hyper-chaos,and multi-existing chaotic attractors are observed from the star network,although there are only periodic states in a complex-valued van der Pol *** versus coupling strength and nonlinear coefficient shows that the bigger the network size,the larger the parameter range within the chaotic(hyper-chaotic)*** is revealed that the chaotic bifurcation path is highly robust against the size variation of the star network,and it always evolves to chaos directly from period-1 and quasi-periodic states,***,the coexistence of chaotic phase synchronization and complete synchronization among the peripherals is also found from the star network,which is a symmetrybreaking phenomenon.

关键词： star network chaotic phase synchronization complex-valued van der Pol oscillator symmetry-breaking

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时空异质性视角下华北地区碳足迹评估及驱动因子分析

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生态经济 2025年第1期41卷 70-79页

作者：袁亮柴林何伟军孔阳祁煜智三峡大学经济与管理学院湖北宜昌443002

碳足迹是衡量碳排放的重要指标,削减碳足迹是实现“双碳”目标的前提条件。华北地区作为我国高耗能、高排放的集中区域,客观量化碳足迹并探究主要驱动因子对加快推进碳减排具有重要意义。为此,论文基于IPCC法对华北地区“十五”至“十... 详细信息

碳足迹是衡量碳排放的重要指标,削减碳足迹是实现“双碳”目标的前提条件。华北地区作为我国高耗能、高排放的集中区域,客观量化碳足迹并探究主要驱动因子对加快推进碳减排具有重要意义。为此,论文基于IPCC法对华北地区“十五”至“十三五”期间的碳足迹进行测算,运用标准差椭圆分析碳足迹的分布及转移特征,使用地理探测器识别碳足迹的主要驱动因子。研究发现:(1)“十五”至“十三五”期间碳足迹总量经历了“先增长—后下降”两个阶段,由“十五”期间的425452万吨上升至1066353万吨,而后逐渐下降到“十三五”期间的898908万吨。(2)标准差椭圆呈稳定的“南—北”分布,重心分布于山西大同和河北张家口之间,呈向西北方向偏移趋势,已偏移72.56千米。(3)能源强度、产业结构、城镇化率对碳足迹驱动因子解释力度较大,且关键交互因子均含有能源强度、产业结构、研发投入。华北地区不同时期碳足迹分布及影响因子存在时空差异,在制定碳减排政策时应充分考虑区域碳足迹的时空异质性。

关键词：碳足迹驱动因子时空特征地理探测器标准差椭圆

Adaptive control for a class of discrete-time time-delay systems with regard to delay parameter

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Journal of Systems Engineering and Electronics 2009年第1期20卷 159-167页

作者： chai lin Cheng Ming Fei Shumin Zhai Junyong Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast Univ. Nanjing 210096 P. R. China School of eleetrics Southeast Univ. Nanjing 210096 P. R. China

The memory state feedback control problem for a class of discrete-time systems with input delay and unknown state delay is addressed based on LMIs and Lyapunov-Krasovskii functional method. Under the action of our designed adaptive control law, the unknown time-delay parameter is included in memory state feedback controller. Using LMI technique, delay-dependent sufficient conditions for the existence of the feedback controller are obtained. Finally, the effectiveness of the proposed design method is demonstrated by a numerical example.

关键词： discrete-time time-delay systems adaptive control linear matrix inequality.

Performance,microbial community and inhibition kinetics of long-term Cu2+ stress on an air-lift nitritation reactor with self-recirculation

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Journal of Environmental Sciences 2020年第5期32卷 117-127页

作者： Fan Feng Cheng-Shan Duan Xi Tang Xi Chen Xuan Lu Xi-lin chai Qaisar Mahmood Chong-Jian Tang Li-Yuan chai Department of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha410083China National Engineering Research Centre for Control and Treatment of Heary Metal Pollution Changsha410083China The Jiangxi Provincial Collaborative Research Institute for Environmental Protection Industry Wannian335500China Jiangxi Gaia Environmental Science&Technology Co. Ltd.Shangrao334000China Department of Environmental Sciences COMSATS UniversityAbbottabadPakistan

Biological nitrogen removal process could be affected due to the presence of heavy metals owing to their toxicity and accumulation in the *** this study,the impact of Cu2+shock on a long-term nitritation operation was investigated in an air-lift reactor with *** the dynamics of microbial community and inhibition kinetics under Cu2+stress were *** results showed that Cu2+exerted severe inhibition on nitritation performance of an air-lift reactor(ALR)at 25 mg/*** corresponding NH4+-N removal efficiency decreased to below 50%,which was mainly due to the variation of microbial community structure,especially the inhibition of nitrifiers like Nitrosomonas(the relative abundance decreased from 30%to 1%after Cu2+inhibition).Kinetic parameters were obtained and compared after fitting the Haldane *** long-term Cu2+stress on the ALR aggravated the ammonium affinity and the resistance to substrate self-inhibition of the nitritation sludge,but reduced the resistance to Cu2+***,Cu2+acted as uncompetitive inhibitor on nitritation *** results provide new insights into the nitritation characteristics under long-term Cu2+stress.

关键词： Nitritation Cu2+inhibition Microbial structure Haldane model Kinetics

Exact scattering states in one-dimensional Hermitian and non-Hermitian potentials

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Chinese Physics B 2020年第9期29卷 194-198页

作者： Ruo-lin chai Qiong-Tao Xie Xiao-Liang Liu College of Physics and Electronic Engineering Hainan Normal UniversityHaikou 571158China School of Physics and Electronics Central South UniversityChangsha 410083China

The scattering states in one-dimensional Hermitian and non-Hermitian potentials are investigated. An analytical solution for the scattering states is presented in terms of Heun functions. It is shown that for some specially chosen parameter conditions, an infinite number of the exact scattering states is obtained. In the Hermitian potentials, they correspond to the reflectionless states. In the non-Hermitian complex potentials with parity-time symmetry, they are the unidirectionally reflectionless states.

关键词： exact solutions scattering states non-Hermitian potential

Comparative Proteomic Analysis of Cucumber Fruits Under Nitrogen Deficiency At the Fruiting Stage

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Horticultural Plant Journal 2021年第1期7卷 59-72页

作者： Jia Hao Qiang Li Hongjun Yu Heng Wang lin chai Tiantian Miao Weijie Jiang Institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesBeijing 100081China

Nitrogen deficiency is a major factor that affects the yield and quality of horticultural *** expressed proteins were identified in cucumber fruit under nitrogen deficiency treatment,and are expected to be highly useful for dissecting carbon,nitrogen and ascorbate metabolism in cucumber and for improving nitrogen fertilizer *** plants grown hydroponically in Hoagland solution were transferred to nitrogen-free conditions for 3 or 5 d after the blossom of female *** proteome profiles were assessed using twodimensional *** relative expression of the genes encoding 50 selected differentially expressed proteins and 4 key enzymes in carbon metabolism was analyzed by *** showed that most of the identified differentially expressed proteins were mainly associated with carbon metabolism,amino acid biosynthesis,ascorbate metabolism,and *** phosphorylation was enhanced,while the pentose phosphate pathway was *** metabolism and the synthesis of most amino acids was affected significantly,and ascorbate might be accumulated under nitrogen deficiency in cucumber fruit.

关键词： cucumber fruit nitrogen deficiency proteomics

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临近空间测控系统技术特征分析

宇航学报 2010年第7期31卷 1697-1705页

作者：柴霖中国西南电子技术研究所成都610036

临近空间飞行器与传统航天器和航空器相比,有其突出的特点,相应地临近空间测控与信息传输系统也有其独特的要求。如何保障和适应临近空间平台的运行和应用是飞行器测控技术发展的重要课题。首先对临近空间飞行器概念内涵作辨析,然后从... 详细信息

临近空间飞行器与传统航天器和航空器相比,有其突出的特点,相应地临近空间测控与信息传输系统也有其独特的要求。如何保障和适应临近空间平台的运行和应用是飞行器测控技术发展的重要课题。首先对临近空间飞行器概念内涵作辨析,然后从多方面系统地分析了临近空间测控系统的需求,研究其主要技术特征,同时提出初步解决措施。

关键词：键词:临近空间测控信息传输技术特征