Parabolic boundary-value problems with equivalued surface on the domain with a thin layer.
Parabolic partial differential equations with memory
Partly dissipative systems in uniformly local spaces
We study the existence of attractors for partly dissipative systems in ℝⁿ. For these systems we prove the existence of global attractors with attraction properties and compactness in a slightly weaker topology than the topology of the phase space. We obtain abstract results extending the usual theory to encompass such two-topologies attractors. These results are applied to the FitzHugh-Nagumo equations in ℝⁿ and to Field-Noyes equations in ℝ. Some embeddings between uniformly local spaces are also...
PDE models for chemotactic movements: Parabolic, hyperbolic and kinetic
Modeling the movement of cells (bacteria, amoeba) is a long standing subject and partial differential equations have been used several times. The most classical and successful system was proposed by Patlak and Keller & Segel and is formed of parabolic or elliptic equations coupled through a drift term. This model exhibits a very deep mathematical structure because smooth solutions exist for small initial norm (in the appropriate space) and blow-up for large norms. This reflects experiments on...
Periodic solutions of a three-species periodic reaction-diffusion system
We study a periodic reaction-diffusion system of a competitive model with Dirichlet boundary conditions. By the method of upper and lower solutions and an argument similar to that of Ahmad and Lazer, we establish the existence of periodic solutions and also investigate the stability and global attractivity of positive periodic solutions under certain conditions.
Phase transition with supercooling
L'articolo riassume il quadro dei risultati noti circa il cosiddetto problema di Stefan con sopraraffreddamento. Con ciò si intende in senso lato l'estensione del modello di Stefan a quei casi in cui la temperatura della fase liquida (solida) non è confinata al di sopra (sotto) di quella di cambiamento di fase, supposta costante. La nostra discussione è prevalentemente rivolta allo sviluppo di singolarità (non limitatezza della velocità dell'interfaccia, ecc.), al modo di prevederle, di prevenirle...
Poincaré theorem and nonlinear PDE's
A family of formal solutions of some type of nonlinear partial differential equations is found. Terms of such solutions are Laplace transforms of some Laplace distributions. The series of these distributions are locally finite.
Pointwise bounds for solutions of the equation - ...v + pv = 0.
Polynomial boundedness of eigensolutions and the spectrum of Schrödinger operators.
Positive solutions for a class of quasilinear singular equations.
Positive unbounded solutions of second order quasilinear ordinary differential equations and their application to elliptic problems
In this paper we consider positive unbounded solutions of second order quasilinear ordinary differential equations. Our objective is to determine the asymptotic forms of unbounded solutions. An application to exterior Dirichlet problems is also given.
Prion proliferation with unbounded polymerization rates.
Problème de Cauchy et diffusion à données petites pour les modèles discrets de la cinétique des gaz
Problème de Cauchy semi-linéaire en 3 dimensions d'espace. Un résultat de finitude
Problème de Dirichlet pour un opérateur elliptique dans un domaine à point cuspide
Propagation de la régularité locale de solutions d'équations hyperboliques non linéaires
Pour tout réel positif , on étudie la propagation de la régularité locale pour des solutions d’équations aux dérivées partielles hyperboliques non linéaires, admettant a priori la régularité minimale permettant de définir les expressions non linéaires figurant dans l’équation. En particulier, on démontre le théorème de propagation dans le cas des solutions essentiellement bornées (resp. lipschitziennes) de systèmes du premier ordre semi-linéaires (resp. quasi-linéaires).
Propagation de l'analyticité des solutions de systèmes hyperboliques non-linéaires.
Propagation estimates for Dirac operators and application to scattering theory
In this paper, we prove propagation estimates for a massive Dirac equation in flat spacetime. This allows us to construct the asymptotic velocity operator and to analyse its spectrum. Eventually, using this new information, we are able to obtain complete scattering results; that is to say we prove the existence and the asymptotic completeness of the Dollard modified wave operators.
Propagation, reflection and refraction of singularities for a hyperbolic transmission problem in two adjacent angular regions
Properties of centered random walks on locally compact groups and Lie groups.