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We study the problem of the approximate boundary controllability associated to the semilinear heat equationThe work presents an adaptation for boundary control problems of a fixed point technique introduced by E. Zuazua in the context of the equation of the wave, which had also been applied in the study of the approximate controlability when the controls act inside the domain Ω.The demonstration that we present is constructive in the sense that we explicitly obtain a boundary control in function of the solution of the adjoint system associated to our problem.

This work is concerned with the study of exact internal controllability problem for the semilinear heat equation with nonlinearities globally Lipschitz. Using the Minty- Brouider surjective theorem we show that the semilinear heat equation is exactly controllable in L2(Ω). For nonlinearities of the form f(y), this result was obtained by W. Liu and G. Williams [5]. Following the ideas exposed in [5] we show the same controllability result but for more general nonlinearities involving gradient f (y, y).

In this work we consider a linearized system of parabolic equations associated to a semilinear system of heat equations. Following the ideas of O. Imanuvilov, M. Yamamoto and L. de Teresa we prove a estímate of Carleman type for a system of parabolic equations involving gradient terms. This class of systems appears in the treatment of controls insensitizing the norm of the solution of a semilinear heat equation.

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We study the problem of the approximate boundary controllability associated to the semilinear heat equationThe work presents an adaptation for boundary control problems of a fixed point technique introduced by E. Zuazua in the context of the equation of the wave, which had also been applied in the study of the approximate controlability when the controls act inside the domain Ω.The demonstration that we present is constructive in the sense that we explicitly obtain a boundary control in function of the solution of the adjoint system associated to our problem.

El presente trabajo trata acerca del problema de la controlabilidad exacta interna para la ecuación semilineal del calor con no linealidad globalmente Lipschitz. Usando el Teorema sobreyectivo de Minty-Browder demostramos que la ecuación semilineal del calor es exactamente controlable en L2(Ω). Este resultado fue obtenido por W. Liu y G. Williams [5] para no linealidades de la forma f (y). Siguiendo las ideas expuestas en [5] probamos el mismo resultado de controlabilidad pero para no linealidades más generales involucrando términos gradientes f (y,tri_01 y).

En este trabajo consideramos un sistema linealizado de ecuaciones parabólicas acopladas asociadas a un sistema semilineal de ecuaciones del calor. Siguiendo las ideas de O. Imanuvilov, M. Yamamoto y L. de Teresa probamos una estimativa de tipo Carleman para un sistema de ecuaciones parabólicas que envuelventérminos gradientes. Esta clase de sistemas aparecen en el estudio de controles quehacen insensitiva a la norma de la solución de una ecuación semilineal del calor.

This paper deals with stability of solution for a one-dimensional model of Rao–Nakra sandwich beam with Kelvin–Voigt damping and time delay given by 1ℎ1 − 1ℎ1 − (− + + ) − − ( ・ , − ) = 0, 3ℎ3 − 3ℎ3 + (− + + ) − = 0, ℎ + − (− + + ) − = 0. A sandwich beam is an engineering model that consists of three layers: two stiff outer layers, bottom and top faces, and a more compliant inner layer called “core layer”. Rao–Nakra system consists of three layers and the assumption is that there is no slip at the interface between contacts. The top and bottom layers are wave equations for the longitudinal displacements under Euler–Bernoulli beam assumptions. The core layer is one equation that describes the transverse displacement under Timoshenko beam assumptions. By using the semigroup theory, the well-posedness is given by applying the Lumer–Phillips ...

vcabanil@ulima.edu.pe

sing monotone maximal operators Theory and the Minty-Browder theorem, we prove the existence of global solution to the elastic-dynamic system on cubic crystals, which is given a nonlinear control f. Also, using multiplicative techniques, results of R. Dautry. - J. L. Lions, integral inequalities, Russel' Principie, the W. Liu method, and adapting the F. Conrad and B. Rao method in the calculation of the estimates, we show that the energy associated to the system decays to zero when t → +∞.

Usando la Teoría de Operadores maximales monótonos y el Teorema de Minty-Browder, probamos la existencia de solución global de un sistema elásticodinámico relativo a cristales cúbicos, al cual suministramos un control no lineal f. También, usando técnicas multiplicativas, resultados de Dautry R. - Lions J. L., desigualdades integrales, el Principio de D. L. Russel, el método de W. Liu y adaptando el método de F. Conrad y B. Rao en el cálculo de las estimativas, mostramos que la energía asociada al sistema decae a cero cuando t → +∞.