Noticias en español
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.
Sobre el fenómeno de transición de fase en percolación.
Resumen: Consideremos una subdivisión del plano en hexágonos como una colmena, y coloreemos cada célula en negro con probabilidad p de manera independiente. La cantidad de células negras crece linealmente con p. Sin embargo, al estudiar en especial propiedades de conexiones a gran escala, se observan fenómenos de umbral, centrados alredededor el parámetro p_c=1/2. Se trata pues de una transición de fase. Este fenómeno es descrito por el teorema de Harris-Kesten demostrado en parte en 1960, y completado en 1980. Desde entonces, en mecánica...
A general asymptotic function with applications
Abstract: Due to its definition through the epigraph, the usual asymptotic function of convex analysis is a very effective tool for studying minimization, especially of a convex function. However, it is not as convenient, if one wants to study maximization of a function “f”; this is done usually through the hypograph or, equivalently, through “−f”. We introduce a new concept of asymptotic function which allows us to simultaneously study convex and concave functions as well as quasi-convex and quasi-concave functions....
Questions on finite metric spaces that arise in the euclidean plane.
Abstract: In this talk we will discuss some recent results about the following conjecture of Xiaomin Chen and Vasek Chvátal: In each finite metric space with n points there are at least n different lines or there is a line containing all the points.
Segundo Curso Introductorio Usuarios NLHPC
Los contenidos que revisaremos serán los siguientes: Infraestructura NLHPC Presentación de infraestructura NLHPC. Accediendo al cluster y enviando tareas Accediendo al cluster: Nodos Login NLHPC. Uso básico de Slurm. Uso del comando srun y sus parámetros. Uso del comando sbatch. Script básico. Encolar. Monitorear. Cancelar. Subutilización de recursos. Otras tareas básicas. Software disponible: Listando software disponible. Usando el software disponible. ¿No está el software que necesito? Solicitud de instalación a soporte. Instalando mi...
Variables relevantes en la propagación y letalidad del COVID-19: Un estudio global.
Resumen: La enfermedad por coronavirus 2019 (COVID-19) es causada por un virus recientemente descubierto en China, declarado pandemia el 11 de marzo de 2020. A la fecha, ha causado más de 400,000 fallecidos y se ha propagado rápidamente por todo el mundo, alcanzando la cifra de 7 millones de infectados. Es por esto, que nace la necesidad urgente de conocer su comportamiento en distintas regiones del mundo y estudiar sus propiedades para hacerle frente con efectividad. Este estudio busca entender mejor la enfermedad usando métodos de...
On the inhomogeneous nonlinear Schrödinger equation. & Una Versión No autónoma del Problema de Estabilidad Global.
Título: On the inhomogeneous nonlinear Schrödinger equation. Abstract: In this talk we discuss some results for the inhomogeneous nonlinear Schrödinger equation, such as global well-posedness, scattering, concentration and blow-up of the critical norm. These results were obtained in collaboration with Luccas Campos (UFMG-Brazil), Mykael Cardoso (UFPI-Brazil) and Carlos Guzmán (UFF-Brazil). Título: Una Versión No autónoma del Problema de Estabilidad Global. Abstract: En esta charla introduciremos la versión no autónoma del problema de esta-...
Uso de imágenes satelitales para optimizar el uso del agua en la agricultura.
Participación en Línea: http://vcespresso.redclara.net/@352109705c115cdd511fb968f9f4ff86# Use Explorer, Firefox o Safari. Debe tener instalado Flash Player en su navegador.
Stabilizers in group Cantor actions and measures.
ABSTRACT: Given a countable group G acting on a Cantor set X by transformations preserving a probability measure, the action is essentially free if the set of points with trivial stabilizers has full measure. On the other hand, there are many examples of group actions, where every point has a non-trivial stabilizer. In this talk, we generalize the notion of an essentially free action to such actions, using the notion of holonomy. For equicontinuous actions of countable groups on Cantor sets, we answer the following question: under what...
Random time transformation analysis of Covid19 2020.
Abstract: The SIR epidemiological equations model new affected and removed cases as roughly proportional to the current number of infected cases. An alternative that has been considered in the literature will be adopted, in which the number of new affected cases is proportional to the α power of the number of infected cases. After arguing that α =1 models exponential growth while α <1 models polynomial growth, a simple method for parameter estimation in differential equations subject to noise, the random-time transformation RTT of Bassan,...
S. Latif et al. Leveraging Data Science To Combat COVID-19:A Comprehensive Review.
Abstract: Abstract—COVID-19, an infectious disease caused by the SARS-CoV-2 virus, was declared a pandemic by the World Health Organisation (WHO) in March 2020. At the time of writing, more than 2.8 million people have tested positive. Infections have been growing exponentially and tremendous efforts are being made to fight the disease. In this paper, we attempt to systematise ongoing data science activities in this area. As well as reviewing the rapidly growing body of recent research, we survey public datasets and repositories that can be...
