La llengua catalana i la competència a la TV

La llengua catalana i la competència a la T

Un bien imprescindible.

Artículo de la sección Tribuna: investigación y profesión

El teatro indígena y campesino

El teatro indígena y campesin

Grupo de Teatro "Nuestro," Washington, D.C.

Grupo de Teatro "Nuestro," Washington, D.C

III Festival del Siglo de Oro (Chamizal)

III Festival del Siglo de Oro (Chamizal

El proceso de objetivación del concepto de área en estudiantes sordos desde el uso de artefactos

En el presente trabajo de investigación se muestran los avances del proyecto de investigación que se adelanta en el marco de la Maestría en Educación, línea Educación Matemática, bajo la orientación del grupo de investigación Matemática, Educación y Sociedad (MES) de la Universidad de Antioquia. En este estudio se pretende analizar el proceso de objetivación del concepto de área en estudiantes sordos desde el uso de artefactos. Esta investigación es realizada a la luz del paradigma cualitativo, bajo un enfoque crítico-dialéctico desde una investigación participante, y para el análisis de las producciones de los estudiantes se utiliza el estudio de casos

Study for the identification of psychophysiological markers of healthy aging and mild cognitive impairment

The main aims of this doctoral study were to identify psychophysiological markers of healthy aging and amnestic mild cognitive impairment (aMCI). Event-related brain potentials (ERPs) associated with the automatic detection of unattended infrequent (deviant/novel) auditory stimuli (MMN), the orienting response to these stimuli (P3a) and the reorienting of attention (RON) to visual relevant stimuli were evaluated. Middle-aged and old adults, relative to young, showed a decline in processing of irrelevant stimuli and the posterior reorienting of attention to relevant stimuli. MMN and P3a components may be useful psychophysiological markers for the diagnosis of aMCI and for distinguishing between aMCI subtypes

Black hole induced spins from hyperbolic encounters in dense clusters

The black holes that have been detected via gravitational waves (GW) can have either astrophysical or primordial origin. Some GW events show significant spin for one of the components and have been assumed to be astrophysical, since primordial black holes are generated with very low spins. However, it is worth studying if they can increase their spin throughout the evolution of the universe. Possible mechanisms that have already been explored are via multiple black hole mergers and gas accretion. We propose here a new mechanism that can occur in dense clusters of black holes: the spin up of primordial black holes when they are involved in close hyperbolic encounters. We explore this effect numerically with the Einstein Toolkit for different initial conditions, including variable mass ratios. For equal masses, there is a maximum spin that can be induced on the black holes, ꭕ=a/m≤0.2. We find however that for large mass ratios one can attain spins up to ꭕ≃0.7, where the highest spin is induced on the most massive black hole. For small induced spins we provide simple analytical expressions that depend on the relative velocity and impact parameterWe would like to thank Zachariah Etienne and Patrick E. Nelson for their help regarding BH hyperbolic encounters with the Einstein Toolkit. All the simulations have been run in the Hydra HPC cluster in the IFT. S.J. is supported by a predoctoral contract by the Spanish Ministry of Science, Ref. SEV-2016-0597- 19-2. The authors acknowledge support from the Research Project PGC2018-094773-B-C32 [MINECO, Spain-FEDER, Spain], and the Centro de Excelencia Severo Ochoa Program, Spain SEV-2016-059