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Qualitative properties of the free-boundary of the Reynolds equation in lubrication.

S. J. Alvarez — 1989

Publicacions Matemàtiques

The hydrodynamic lubrication of a cylindrical bearing is governed by the Reynolds equation that must be satisfied by the pressure of lubricating oil. When cavitation occurrs we are carried to an elliptic free-boundary problem where the free-boundary separates the lubricated region from the cavited region. Some qualitative properties are obtained about the shape of the free-boundary as well as the localization of the cavited region.

C * -algebras of operators in non-archimedean Hilbert spaces

J. Antonio Alvarez — 1992

Commentationes Mathematicae Universitatis Carolinae

We show several examples of n.av̇alued fields with involution. Then, by means of a field of this kind, we introduce “n.aḢilbert spaces” in which the norm comes from a certain hermitian sesquilinear form. We study these spaces and the algebra of bounded operators which are defined on them and have an adjoint. Essential differences with respect to the usual case are observed.

Analysis of a time optimal control problem related to the management of a bioreactor

Lino J. Alvarez-VázquezFrancisco J. FernándezAurea Martínez — 2011

ESAIM: Control, Optimisation and Calculus of Variations

We consider a time optimal control problem arisen from the optimal management of a bioreactor devoted to the treatment of eutrophicated water. We formulate this realistic problem as a state-control constrained time optimal control problem. After analyzing the state system (a complex system of coupled partial differential equations with non-smooth coefficients for advection-diffusion-reaction with Michaelis-Menten kinetics, modelling the eutrophication processes) we demonstrate the existence of,...

Analysis of a time optimal control problem related to the management of a bioreactor

Lino J. Alvarez-VázquezFrancisco J. FernándezAurea Martínez — 2011

ESAIM: Control, Optimisation and Calculus of Variations

We consider a time optimal control problem arisen from the optimal management of a bioreactor devoted to the treatment of eutrophicated water. We formulate this realistic problem as a state-control constrained time optimal control problem. After analyzing the state system (a complex system of coupled partial differential equations with non-smooth coefficients for advection-diffusion-reaction with Michaelis-Menten kinetics, modelling the eutrophication processes) we demonstrate the existence of,...

Foliations by planes and Lie group actions

J. A. Álvarez LópezJ. L. ArrautC. Biasi — 2003

Annales Polonici Mathematici

Let N be a closed orientable n-manifold, n ≥ 3, and K a compact non-empty subset. We prove that the existence of a transversally orientable codimension one foliation on N∖K with leaves homeomorphic to n - 1 , in the relative topology, implies that K must be connected. If in addition one imposes some restrictions on the homology of K, then N must be a homotopy sphere. Next we consider C² actions of a Lie group diffeomorphic to n - 1 on N and obtain our main result: if K, the set of singular points of the...

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