Seminars

Seminars appear in decreasing order in relation to date. To find an activity of your interest just go down on the list. Normally seminars are given in english. If not, they will be marked as Spanish Only.

 

Well-posedness and long time behavior for the Schrödinger-Korteweg-de Vries interactions on the half-Line

Event Date: Nov 19, 2018 in CAPDE, Seminars

Abstract:   In this talk we discuss about the initial-boundary value problem for the Schrödinger-Korteweg-de Vries system on the left and right half-line for a wide class of initial-boundary data, including the energy regularity H1(R±) × H1(R±) for initial data. Assuming homogeneous boundary conditions it is shown for positive coupling interactions that local solutions can be extended globally in time for initial data in the energy space; furthermore, for negative coupling interactions it was proved, for a certain class of regular initial...

Resonances in deformed tubes: twisting and bending & Gross-Pitaevskii equation and integrable systems

Event Date: Nov 12, 2018 in CAPDE, Seminars

16:00 hrs.   Expositor Pablo Miranda, (USach) Título Resonances in deformed tubes: twisting and bending Abstract: In this talk we will consider  an infinite straight tube and  we will deform it  by a periodic twisting and a local bending. On the deformed tube we will define the Laplacian and will study the existence of scattering resonances created by the deformations. We will show the existence of exactly one resonance or one eigenvalue near the bottom of the essential spectrum, depending on the strength of the twisting and the bending. We...

An approach to optimality in convex optimization via some new Moreau- Rockafellar type formulas for the subdifferential of the supremum function.

Event Date: Nov 07, 2018 in Optimization and Equilibrium, Seminars

Abstract: We present different characterizations of the subdifferential of the supremum function of finitely and infinitely indexed families of convex functions under weak continuity assumptions. The resulting formulas are given in terms of the exact subdifferential of the data functions at the reference point, and not at nearby points. Based on these characterizations we give new Fritz-John and KKT-type optimality conditions for semi-infinite convex optimization, dropping out the typical continuity/closedness assumptions which are usual in...

Confort y la calidad climática en el Espacio Público. Estudio de caso: ciudad de Chillán, Chile

Event Date: Nov 05, 2018 in Ciclo de Seminarios quincenales de la Alianza Copernicus-Chile, Seminars

Seminarios de la Alianza Copernicus-Chile Titulo                 Confort y la calidad climática en el Espacio Público. Estudio de caso: ciudad de Chillán, Chile Expositor    Pamela Smith U. de Chile Sala:  Sala Multimedia, Centro de Modelamiento Matemático, Beauchef 851, Edificio Norte, Piso 6. Fecha:  Lunes 05 de Noviembre de 2018 Hora:  16:00 horas   Participación en Linea:  http://vcespresso.redclara.net/@352109705c115cdd511fb968f9f4ff86# Use Explorer, Firefox o Safari, debe tener instalado Flash Player...

Almost everywhere convergence of ergodic averages

Event Date: Oct 29, 2018 in Dynamical Systems, Seminars

ABSTRACT:   In this talk I would like to discuss some of my results concerning almost everywhere convergence of non-conventional ergodic averages of L1 functions. These topics include: divergence of ergodic averages along the squares; convergence along some sequences of zero Banach density; convergence for arithmetic weights: the prime divisor functions ω and Ω.  

Particles-based simulations and GPU computing for soft matter science and computer graphics applications

Event Date: Oct 25, 2018 in CMM Modeling, Seminars

Summary:   Particle-based simulation codes used in soft matter science aim at represent the interactions that occur in colloidal suspensions at nanoscale level. These suspensions are a mixture of solid particles of diameter between 100 and 1000 nanometers and a solvent (usually water), all interacting with each other. The main goal when implementing these codes on the GPU is to accelerate the “particle neighbour searching” phase, which is the bottleneck in most lagrangian-based simulations. I will present recent results...

“Second-order characterizations of C1-smooth robustly quasiconvex functions”

Event Date: Oct 24, 2018 in Optimization and Equilibrium, Seminars

Abstract:   “Our aim in this talk is to investigate the possibility of using the Fréchet and Mordukhovich second-order subdifferentials to characterize the robust quasiconvexity of  C1-smooth functions. We set up a necessary condition for the robust quasiconvexity of C1,1-smooth functions and univariate C1-smooth ones. We also show that the established necessary condition is indeed a sufficient one for the robust quasiconvexity of C1-smooth functions.”

El Cubo de Datos de Colombia

Event Date: Oct 22, 2018 in Ciclo de Seminarios quincenales de la Alianza Copernicus-Chile, Seminars

  Seminarios de la Alianza Copernicus-Chile Titulo                    El Cubo de Datos de Colombia   Expositor    Pilar Lozano, IDEAM Sala:  Sala Multimedia, Centro de Modelamiento Matemático, Beauchef 851, Edificio Norte, Piso 6. Fecha:  Lunes 22 de Octubre de 2018 Hora:  16:00 horas   Participación en Linea:  http://vcespresso.redclara.net/@352109705c115cdd511fb968f9f4ff86# Use Explorer, Firefox o Safari, debe tener instalado Flash Player...

Exponentes de Lyapunov y rigidez para difeomorfismos hiperbólicos y parcialmente hiperbólicos

Event Date: Oct 22, 2018 in Dynamical Systems, Seminars

ABSTRACT Voy a presentar unos resultados de rigidez en termino de exponentes de Lyapunov para difeomorfismos hiperbólicos y parcialmente hiperbólicos. Si un difeomorfismo hiperbólico (o parcialmente hiperbólico) es cerca a un automorfismo lineal (o un skew product sobre un automorfismo lineal), preserva el volumen, y tiene los mismos exponentes de Lyapunov (estables e inestable), entonces es suavemente conjugado al automorfismo lineal (o a un skew product sobre el automorfismo lineal). En el caso de difeomorfismos hiperbólicos el resultado...