This article studies the inshore-offshore fishery model with impulsive diffusion. The existence and global asymptotic stability of both the trivial periodic solution and the positive periodic solution are obtained. Th...This article studies the inshore-offshore fishery model with impulsive diffusion. The existence and global asymptotic stability of both the trivial periodic solution and the positive periodic solution are obtained. The complexity of this system is also analyzed. Moreover, the optimal harvesting policy are given for the inshore subpopulation, which includes the maximum sustainable yield and the corresponding harvesting effort.展开更多
The River Chief System (RCS) has evolved from local innovative practices to a national water governance strategy to address the current challenges in China’s water environmental management. In contrast to existing re...The River Chief System (RCS) has evolved from local innovative practices to a national water governance strategy to address the current challenges in China’s water environmental management. In contrast to existing research that focuses on the strengths, weaknesses, and improvements of RCS, this study uses literature study to reveal the dynamic evolution of RCS through three phases, with RCS spreading from developed coastal areas to central and western inland regions. RCS’s diffusion path involves vertical diffusion between central and local levels and horizontal diffusion among local governments. Moreover, RCS has also achieved conceptual spillover, gradually expanding into other governance domains, such as the Lake Chief System, the Field Chief System, the Forestry Chief System, and the integration of multiple chief roles. However, it is essential to scrutinize the phenomenon of applying similar governance mechanisms to different areas, as it may result in challenges such as overburdening local governments, insufficient public participation, oversimplification of differences in natural resource endowments, and limited applicability. This study also provides suggestions on how to address these challenges. The study contributes theoretical insights and policy implications, providing a foundation for practical policy innovation.展开更多
This research analyzes the effects of various environmental regulatory strategies on ecological technology diffusion efficiency(ETDE)across 30 Chinese provinces.It explores the roles of market type(MER),command contro...This research analyzes the effects of various environmental regulatory strategies on ecological technology diffusion efficiency(ETDE)across 30 Chinese provinces.It explores the roles of market type(MER),command control type(CER),and environmental protection type(EER)environmental regulations,alongside the moderating influences of industrial agglomeration(Agg),low-carbon pilot policy(Lcp),fiscal decentralization(FD),and official corruption(Cor)on ETDE.Results show that EER positively affects ETDE,whereas MER and CER tend to inhibit its improvement.The study underscores the complex interplay between these regulations and the significant impact of Agg and Lcp in enhancing ER's effectiveness.Additionally,it highlights the critical mediating roles of FD and Cor,suggesting that the quality of government operations profoundly influences the success of environmental regulations in promoting ecological technology diffusion.These findings emphasize the necessity for tailored environmental regulation strategies that take into account regional economic,population,and digital economy differences,to effectively foster ecological technology diffusion and support China's green development goals.The study also proposes actionable insights for policymakers.展开更多
In this paper,we investigate a model for an insurance company with constraint on risk control.The objective of the insurer is to find a business policy and a dividend payment scheme so as to maximize the expected disc...In this paper,we investigate a model for an insurance company with constraint on risk control.The objective of the insurer is to find a business policy and a dividend payment scheme so as to maximize the expected discounted value of dividend payment,and the expected present value of an amount which the insurer earns until the time of ruin.By solving the constrained Hamilton-Jacobi-Bellman equation,we obtain the explicit expression for value function and the corresponding optimal strategies.展开更多
文摘This article studies the inshore-offshore fishery model with impulsive diffusion. The existence and global asymptotic stability of both the trivial periodic solution and the positive periodic solution are obtained. The complexity of this system is also analyzed. Moreover, the optimal harvesting policy are given for the inshore subpopulation, which includes the maximum sustainable yield and the corresponding harvesting effort.
文摘The River Chief System (RCS) has evolved from local innovative practices to a national water governance strategy to address the current challenges in China’s water environmental management. In contrast to existing research that focuses on the strengths, weaknesses, and improvements of RCS, this study uses literature study to reveal the dynamic evolution of RCS through three phases, with RCS spreading from developed coastal areas to central and western inland regions. RCS’s diffusion path involves vertical diffusion between central and local levels and horizontal diffusion among local governments. Moreover, RCS has also achieved conceptual spillover, gradually expanding into other governance domains, such as the Lake Chief System, the Field Chief System, the Forestry Chief System, and the integration of multiple chief roles. However, it is essential to scrutinize the phenomenon of applying similar governance mechanisms to different areas, as it may result in challenges such as overburdening local governments, insufficient public participation, oversimplification of differences in natural resource endowments, and limited applicability. This study also provides suggestions on how to address these challenges. The study contributes theoretical insights and policy implications, providing a foundation for practical policy innovation.
基金supported by the Yunnan University Research Foundation Program(Grant No.KC-23233830).
文摘This research analyzes the effects of various environmental regulatory strategies on ecological technology diffusion efficiency(ETDE)across 30 Chinese provinces.It explores the roles of market type(MER),command control type(CER),and environmental protection type(EER)environmental regulations,alongside the moderating influences of industrial agglomeration(Agg),low-carbon pilot policy(Lcp),fiscal decentralization(FD),and official corruption(Cor)on ETDE.Results show that EER positively affects ETDE,whereas MER and CER tend to inhibit its improvement.The study underscores the complex interplay between these regulations and the significant impact of Agg and Lcp in enhancing ER's effectiveness.Additionally,it highlights the critical mediating roles of FD and Cor,suggesting that the quality of government operations profoundly influences the success of environmental regulations in promoting ecological technology diffusion.These findings emphasize the necessity for tailored environmental regulation strategies that take into account regional economic,population,and digital economy differences,to effectively foster ecological technology diffusion and support China's green development goals.The study also proposes actionable insights for policymakers.
基金Supported by the National Natural Science Foundation of China (10671149)
文摘In this paper,we investigate a model for an insurance company with constraint on risk control.The objective of the insurer is to find a business policy and a dividend payment scheme so as to maximize the expected discounted value of dividend payment,and the expected present value of an amount which the insurer earns until the time of ruin.By solving the constrained Hamilton-Jacobi-Bellman equation,we obtain the explicit expression for value function and the corresponding optimal strategies.
