87,771 research outputs found
Global emission ceiling versus international cap and trade: a comparison based on normalized Nash equilibria
No full textWe model the climate change issue as a pollution control game with the purpose of comparing two possible departures from the business as usual (BAU) where countries non-cooperatively choose their emission levels. In the first scenario, players have to agree on a global emission cap (GEC) that is enforced by a uniform taxation scheme. They still behave strategically when choosing emission levels but are now subject to the coupled constraint imposed by the cap. The second scenario consists of the implementation of an international cap and trade (ICT) system. In this case, players decide on their emission quotas and emission trading is allowed. A three heterogenous player quadratic game serves as a basis for the analysis. When the cap is binding, among all the coupled constraints Nash equilibria, we select a particular normalized equilibrium by solving a variational inequality. Comparing the normalized equilibrium with the Nash equilibria of the BAU and the ICT, we first show that if the cap is appropriately chosen, then the GEC system improves all players’ payoffs, relative to the BAU. The GEC system may thus be unanimously approved whereas the ICT is not, because moving from the BAU to the ICT is costly for one player. Second, for some values of the cap, all players get a higher payoff under the GEC than under the ICT. Therefore, the GEC outperforms the ICT both in terms of feasibility and efficiency
Boundary control design for conservation laws in the presence of measurement disturbances
No full textBoundary feedback control design for systems of linear hyperbolic conservation laws in the presence of boundary measurements affected by disturbances is studied. The design of the controller is performed to achieve input-to-state stability (ISS) with respect to measurement disturbances with a minimal gain. The closed-loop system is analyzed as an abstract dynamical system with inputs. Sufficient conditions in the form of dissipation functional inequalities are given to establish an ISS bound for the closed-loop system. The control design problem is turned into an optimization problem over matrix inequality constraints. Semidefinite programming techniques are adopted to devise systematic control design algorithms reducing the effect of measurement disturbances. The effectiveness of the approach is extensively shown in several numerical examples
Oeuvres poissardes
No full textEn el pie de imp.: An XI-1803No pé de imp.: An XI- 1803SignaturizadoLa h. de grab. xil. precede a la portA f. de grav. xil. precede á por
Robust Boundary Output-Feedback Control of a Reaction-Diffusion Equation with In-Domain Disturbances
No full textOutput feedback control design for a class of reaction-diffusion equations with Dirichlet anti-collocated sensing and actuation subject to in-domain disturbances is addressed. Within this setting, we design a finite-dimensional dynamic output feedback controller ensuring closed-loop exponential stability and input-output stability with an explicit estimate of the input-output gain. The approach is based on the spectral decomposition of the open-loop infinite-dimensional system and on the use of a suitable Lyapunov functional candidate. Sufficient conditions in the form of matrix inequalities are given to ensure closed-loop stability. These conditions are shown to be always feasible and are employed to devise an optimal controller design algorithm based on the solutions to some linear matrix inequalities
On L ∞stabilization of diagonal semilinear hyperbolic systems by saturated boundary control
No full textThis paper considers a diagonal semilinear system of hyperbolic partial differential equations with positive and constant velocities. The boundary condition is composed of an unstable linear term and a saturated feedback control. Weak solutions with initial data in L2([0, 1]) are considered and well-posedness of the system is proven using nonlinear semigroup techniques. Local L∞ exponential stability is tackled by a Lyapunov analysis and convergence of semigroups. Moreover, an explicit estimation of the region of attraction is given
Parameter Identification of a Linear Wave Equation from Experimental Boundary Data
No full textParameter identification of a drill string is studied. The system is modeled as a hyperbolic system with dynamical boundary conditions. The considered model is a wave equation with spatial dependent elasticity and viscous damping terms. The identification problem is recast as an optimization problem over an infinite-dimensional space. The developed approach ensures that the estimates of the parameters lie in a given set. A gradient descent-based algorithm is proposed to generate parameter estimates based on experimental data. A thorough comparative study with more classical algorithms is presented
Velocity Stabilization of a Wave Equation with a Nonlinear Dynamic Boundary Condition
No full textThis paper deals with a one-dimensional wave equation with a nonlinear dynamic boundary condition and a Neumann-type boundary control acting on the other extremity. We consider a class of nonlinear stabilizing feedbacks that only depend on the velocity at the controlled extremity. The uncontrolled boundary is subject to a nonlinear first-order term, which may represent nonlinear boundary anti-damping. Initial data is taken in the optimal energy space associated with the problem. Exponential decay of the mechanical energy is investigated in different cases. Stability and attractivity of suitable invariant sets are established
Physiologie générale : cours élémentaire et pratique / par M. Foster,... J. N. Langley,... ; traduit sur la 5e édition anglaise... par F. Prieur,...
No full textCollection : Bibliothèque biologique internationale ; 14Collection : Bibliothèque biologique internationale ; 14Contient une table des matièresAvec mode text
F. BovoN, M. van Esbroeck, R. Goulet, E. Junod, J.-D. Kaestli, F. Morard, G. Poupon, J.-M. Prieur et Y. Tissot, « Les Actes apocryphes des apôtres ». Christianisme et monde païen
No full textJoly Robert. F. BovoN, M. van Esbroeck, R. Goulet, E. Junod, J.-D. Kaestli, F. Morard, G. Poupon, J.-M. Prieur et Y. Tissot, « Les Actes apocryphes des apôtres ». Christianisme et monde païen. In: L'antiquité classique, Tome 52, 1983. pp. 403-404
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