Does the Kyoto Protocol as an International Environmental Policy Promote Forest Carbon Sinks?

Under the background of carbon neutrality, the carbon sequestration of forest ecosystems is an important way to mitigate climate change. Forest could not only protect the environment but also an important industry for economic development. As an international climate policy that first recognized the role of forest carbon sinks on climate change, the question becomes, has the Kyoto Protocol promoted the development of forest carbon sinks in contracting parties? To explore this, data of forest can be obtained at the national level. Hence, data of economic, social, polity and climate in 147 countries is also collected. The generalized synthetic control method is adopted. The results show that the policy effect of the Kyoto Protocol was obvious and significant. Moreover, the effect was more significant after the enforcement in 2005. Especially after the first commitment period, the policy effect of the second period is more obvious. Some policy implications are drawn.

Symmetry Control of Comfortable Vehicle Suspension Based on H∞

Suspension is an important part of intelligent and safe transportation; it is the balance point between the comfort and handling stability of a vehicle under intelligent traffic conditions. In this study, a control method of left-right symmetry of air suspension based on H∞ theory was proposed, which was verified under intelligent traffic conditions. First, the control stability caused by the active suspension control system running on uneven roads needs to be ensured. To address this issue, a 1/4 vehicle active suspension model was established, and the vertical acceleration of the vehicle body was applied as the main index of ride comfort. H∞ performance constraint output indicators of the controller contained the tire dynamic load, suspension dynamic stroke, and actuator control force limit. Based on the Lyapunov stability theory, an output feedback control law with H∞-guaranteed performance was proposed to constrain multiple targets. This way, the control problem was transformed into a solution to the Riccati equation. The simulation results showed that when dealing with general road disturbances, the proposed control strategy can reduce the vehicle body acceleration by about 20% and meet the requirements of an ultimate suspension dynamic deflection of 0.08 m and a dynamic tire load of 1500 N. Using this symmetrical control method can significantly improve the ride comfort and driving stability of a vehicle under intelligent traffic conditions.