Under the dual drivers of global climate governance and carbon neutrality goals,agricultural carbon emission reduction has become a pivotal component of regional green transformation.This study focuses on Guangdong,a ...Under the dual drivers of global climate governance and carbon neutrality goals,agricultural carbon emission reduction has become a pivotal component of regional green transformation.This study focuses on Guangdong,a major province,employing the LMDI decomposition mode to systematically analyze the driving mechanis of agricultural carbon emissions.It reveals that the low ecological compensation standard,industrial path dependence,and high-carbon energy lock-in consti-tute core constraints.The research finds that the absence of ecological compensation standards and the structural imbalance of traditional subsidy policies induce diminishing marginal benefits in carbon reduction due to structural imbalances,while persistent funding shortages in low-carbon technology R&D further weaken emission reduction efficacy,exacerbating compatibility contradictions between emission policies and production practices.Through the comparison of domestic and foreign experiences,it is found that under the global wave of low-carbon transformation in agriculture,the ecological compensation optimization layer should establish a calculation system for the carbon sink value of cultivated land and differentiated compensation standards;the fiscal and taxation policy coordination layer should implement a tiered carbon tax on agricultural inputs and carbon sink pledge financing incentives.Constructing a fiscal expenditure and fiscal and taxation coordination mechanism that suits regional characteristics is the key path to resolving the contradiction between the technical economy and ecological sustainability of emission reduction.展开更多
In this paper, the control of a two-time-scale plant, where the sensor is connected to a linear controller/ actuator via a network is addressed. The slow and fast systems of singularly perturbed systems are used to pr...In this paper, the control of a two-time-scale plant, where the sensor is connected to a linear controller/ actuator via a network is addressed. The slow and fast systems of singularly perturbed systems are used to produce an estimate of the plant state behavior between transmission times, by which one can reduce the usage of the network. The approximate solutions of the whole systems are derived and it is shown that the whole systems via the network control are generally asymptotically stable as long as their slow and fast systems are both stable. These results are also extended to the case of network delay.展开更多
In engineering practice,sensors commonly have limited sensitivity errors,which are allowed in the design process.This paper uses a sampled-data output feedback control method so that the problem of global tracking sta...In engineering practice,sensors commonly have limited sensitivity errors,which are allowed in the design process.This paper uses a sampled-data output feedback control method so that the problem of global tracking stabilisation of a class of nonlinear systems with unknown measurement sensitivity can be solved.A sampled-data output feedback control law and a sampled-data observer are constructed with the help of output feedback domination method.By choosing the domination gain and sampling period in place,the resultant control law can globally stabilise the system even under the influence of unknown measurement sensitivity.展开更多
This paper deals with the global practical tracking problem by output-feedback for a class of uncertain cascade systems with zero-dynamics and unmeasured states dependent growth.The systems investigated are substantia...This paper deals with the global practical tracking problem by output-feedback for a class of uncertain cascade systems with zero-dynamics and unmeasured states dependent growth.The systems investigated are substantially different from the closely related works,and have zero-dynamics,unknown growth rate,and unknown time-varying control coefficients.This makes the problem much more difficult to solve.Motivated by the authors' recent works,this paper proposes a new adaptive control scheme to achieve the global practical tracking.It is shown that the designed controller guarantees that the state of the resulting closed-loop system is globally bounded and the tracking error converges to a prescribed arbitrarily small neighborhood of the origin after a finite time.This is achieved by combining the methods of universal control and dead zone with backstepping technique,and using the framework of performance analysis in the closely related works.A numerical example demonstrates the effectiveness of the theoretical results.展开更多
This paper extends the unknown control coefficients with lower and upper constant bounds to the ones which may take arbitrarily large and /or small values.Since the existing methods are no longer applicable and the te...This paper extends the unknown control coefficients with lower and upper constant bounds to the ones which may take arbitrarily large and /or small values.Since the existing methods are no longer applicable and the technical obstacles caused by the extensions are essential,new control design scheme should be exploited to the global practical tracking.By the approaches of Nussbaum-gain and adding a power integrator,the authors successfully propose the design scheme of the adaptive practical tracking controller for the systems.It is shown that the designed controller guarantees that all the closed-loop system states are bounded and the tracking error becomes prescribed arbitrarily small after a finite time.展开更多
This paper focuses on studying the problem of robust output practical stability of timevarying nonlinear control systems. The main innovation lies in the fact that the proposed approach for stability analysis allows f...This paper focuses on studying the problem of robust output practical stability of timevarying nonlinear control systems. The main innovation lies in the fact that the proposed approach for stability analysis allows for the computation of bounds that characterize the asymptotic convergence of solutions to a small ball centered at the origin using a Lyapunov method with a definite derivative.Under different conditions on the perturbation, the authors demonstrate that the system can be globally robustly asymptotically output stable by designing a candidate feedback controller. Finally, three examples are given to illustrate the practical implications and significance of the theoretical results.展开更多
基金Financial support from Guangdong Science and Technology(20230505)Guangdong Provincial Philosophy and Social Science Planning Project(GD20SQ25)Guangdong Provincial Special Fund for Science and Technology Innovation Strategy in 2024(Cultivation of College Students’Science and Technology Innovation)(pdjh2024a391)during preparation of this manuscript.
文摘Under the dual drivers of global climate governance and carbon neutrality goals,agricultural carbon emission reduction has become a pivotal component of regional green transformation.This study focuses on Guangdong,a major province,employing the LMDI decomposition mode to systematically analyze the driving mechanis of agricultural carbon emissions.It reveals that the low ecological compensation standard,industrial path dependence,and high-carbon energy lock-in consti-tute core constraints.The research finds that the absence of ecological compensation standards and the structural imbalance of traditional subsidy policies induce diminishing marginal benefits in carbon reduction due to structural imbalances,while persistent funding shortages in low-carbon technology R&D further weaken emission reduction efficacy,exacerbating compatibility contradictions between emission policies and production practices.Through the comparison of domestic and foreign experiences,it is found that under the global wave of low-carbon transformation in agriculture,the ecological compensation optimization layer should establish a calculation system for the carbon sink value of cultivated land and differentiated compensation standards;the fiscal and taxation policy coordination layer should implement a tiered carbon tax on agricultural inputs and carbon sink pledge financing incentives.Constructing a fiscal expenditure and fiscal and taxation coordination mechanism that suits regional characteristics is the key path to resolving the contradiction between the technical economy and ecological sustainability of emission reduction.
基金the National Natural Science Foundation of China (No. 10671069, 60674046)
文摘In this paper, the control of a two-time-scale plant, where the sensor is connected to a linear controller/ actuator via a network is addressed. The slow and fast systems of singularly perturbed systems are used to produce an estimate of the plant state behavior between transmission times, by which one can reduce the usage of the network. The approximate solutions of the whole systems are derived and it is shown that the whole systems via the network control are generally asymptotically stable as long as their slow and fast systems are both stable. These results are also extended to the case of network delay.
文摘In engineering practice,sensors commonly have limited sensitivity errors,which are allowed in the design process.This paper uses a sampled-data output feedback control method so that the problem of global tracking stabilisation of a class of nonlinear systems with unknown measurement sensitivity can be solved.A sampled-data output feedback control law and a sampled-data observer are constructed with the help of output feedback domination method.By choosing the domination gain and sampling period in place,the resultant control law can globally stabilise the system even under the influence of unknown measurement sensitivity.
基金supported by the National Natural Science Foundation of China under Grant Nos.61325016,61273084,61233014,and 61304013the Natural Science Foundation for Distinguished Young Scholar of Shandong Province of China under Grant No.JQ200919+1 种基金the Independent Innovation Foundation of Shandong University under Grant No.2012JC014the Doctoral Foundation of Jinan University under Grant No.XBS1413
文摘This paper deals with the global practical tracking problem by output-feedback for a class of uncertain cascade systems with zero-dynamics and unmeasured states dependent growth.The systems investigated are substantially different from the closely related works,and have zero-dynamics,unknown growth rate,and unknown time-varying control coefficients.This makes the problem much more difficult to solve.Motivated by the authors' recent works,this paper proposes a new adaptive control scheme to achieve the global practical tracking.It is shown that the designed controller guarantees that the state of the resulting closed-loop system is globally bounded and the tracking error converges to a prescribed arbitrarily small neighborhood of the origin after a finite time.This is achieved by combining the methods of universal control and dead zone with backstepping technique,and using the framework of performance analysis in the closely related works.A numerical example demonstrates the effectiveness of the theoretical results.
基金supported by the National Natural Science Foundations of China under Grant No.60974003 and 61143011the Natural Science Foundation for Distinguished Young Scholar of Shandong Province of China under Grant No.JQ200919+5 种基金the Program for New Century Excellent Talents in University of China under Grant No.NCET-07-0513the Key Science and Technique Foundation of Ministry of Education of China under Grant No.108079the Excellent Young and Middle-Aged Scientist Award Grant of Shandong Province of China under Grant No.2007BS01010the Independent Innovation Foundation of Shandong University under Grant No.2009JQ008the Scholarship Award for Excellent Doctoral Student granted by Ministry of Educationthe Graduate Independent Innovation Foundation of Shandong University
文摘This paper extends the unknown control coefficients with lower and upper constant bounds to the ones which may take arbitrarily large and /or small values.Since the existing methods are no longer applicable and the technical obstacles caused by the extensions are essential,new control design scheme should be exploited to the global practical tracking.By the approaches of Nussbaum-gain and adding a power integrator,the authors successfully propose the design scheme of the adaptive practical tracking controller for the systems.It is shown that the designed controller guarantees that all the closed-loop system states are bounded and the tracking error becomes prescribed arbitrarily small after a finite time.
文摘This paper focuses on studying the problem of robust output practical stability of timevarying nonlinear control systems. The main innovation lies in the fact that the proposed approach for stability analysis allows for the computation of bounds that characterize the asymptotic convergence of solutions to a small ball centered at the origin using a Lyapunov method with a definite derivative.Under different conditions on the perturbation, the authors demonstrate that the system can be globally robustly asymptotically output stable by designing a candidate feedback controller. Finally, three examples are given to illustrate the practical implications and significance of the theoretical results.
