eXtended hybridizable discontinuous Galerkin for incompressible flow problems with unfitted meshes and interfaces

The eXtended hybridizable discontinuous Galerkin (X-HDG) method is developed for the solution of Stokes problems with void or material interfaces. X-HDG is a novel method that combines the hybridizable discontinuous Galerkin (HDG) method with an eXtended finite element strategy, resulting in a high-order, unfitted, superconvergent method, with an explicit definition of the interface geometry by means of a level-set function. For elements not cut by the interface, the standard HDG formulation is applied, whereas a modified weak form for the local problem is proposed for cut elements. Heaviside enrichment is considered on cut faces and in cut elements in the case of bimaterial problems. Two-dimensional numerical examples demonstrate that the applicability, accuracy, and superconvergence properties of HDG are inherited in X-HDG, with the freedom of computational meshes that do not fit the interfacesPeer ReviewedPostprint (author's final draft

Elliptic harbor wave model with perfectly matched layer and exterior bathymetry effects

Standard strategies for dealing with the Sommerfeld condition in elliptic mild-slope models require strong assumptions on the wave field in the region exterior to the computational domain. More precisely, constant bathymetry along (and beyond) the open boundary, and parabolic approximations–based boundary conditions are usually imposed. Generally, these restrictions require large computational domains, implying higher costs for the numerical solver. An alternative method for coastal/harbor applications is proposed here. This approach is based on a perfectly matched layer (PML) that incorporates the effects of the exterior bathymetry. The model only requires constant exterior depth in the alongshore direction, a common approach used for idealizing the exterior bathymetry in elliptic models. In opposition to standard open boundary conditions for mild-slope models, the features of the proposed PML approach include (1) completely noncollinear coastlines, (2) better representation of the real unbounded domain using two different lateral sections to define the exterior bathymetry, and (3) the generation of reliable solutions for any incoming wave direction in a small computational domain. Numerical results of synthetic tests demonstrate that solutions are not significantly perturbed when open boundaries are placed close to the area of interest. In more complex problems, this provides important performance improvements in computational time, as shown for a real application of harbor agitation.Peer ReviewedPostprint (author's final draft

Eficacia de las intervenciones con niños y adolescentes con Trastorno por Déficit de Atención con Hiperactividad (TDAH)

This study presents the results of a diachronic literature review of publications about approaches to ADHD treatment, in order to determine the number and efficacy of treatment approaches during the last 25 years. Results derived from this literature review of three temporal periods (1986-1992; 1994-2000; 2001-2011), show that studies were mainly focused on pharmacological treatment. Possible explanations of this trend are argued, emphasising the need to promote multimodal and contextual intervention

Efficacy of Attention Deficit Hyperactivity Disorder treatments in children and adolescents

En este estudio presentamos un análisis diacrónico sobre la investigación en el tratamiento del TDAH infantil y adolescente, para determinar el número y la eficacia de las modalidades de intervención empleadas durante los últimos 25 años. Los resultados derivados de revisiones bibliográficas de tres períodos temporales distintos (1986-1992; 1994-2000; 2001-2011), muestran que la mayoría de ellos se ha centrado en analizar la eficacia del tratamiento farmacológico. Se concluye con explicaciones de esta tendencia, enfatizando la importancia de implementar intervenciones multimodales y contextualizadas.This study presents the results of a diachronic literature review of publications about approaches to ADHD treatment, in order to determine the number and efficacy of treatment approaches during the last 25 years. Results derived from this literature review of three temporal periods (1986-1992; 1994-2000; 2001-2011), show that studies were mainly focused on pharmacological treatment. Possible explanations of this trend are argued, emphasising the need to promote multimodal and contextual intervention

Los géneros periodísticos en la didáctica del periodismo en España. Un recorrido histórico

This article shows the influence that journalistic genres had on the first organisation of communication studies in Spain as well as the role they remain to play in the teaching of journalism. A review is done starting from the origins of the didactics of genres, continuing with the role of genres in the beginning of regulated studies of journalism, and finalising with an analysis of their place in present education programmes which reveals that practical and theoretical knowledge of the genres are still a main objective in the training of future journalists in Spain.Este artículo tiene como objetivo mostrar la influencia que tuvieron los géneros periodísticos en las primeras estructuraciones de los estudios de comunicación en España y el lugar que hoy siguen ocupando en la enseñanza universitaria del periodismo. Para ello se hace un recorrido que parte de los orígenes de la didáctica de los géneros, continúa con el papel de los géneros en el establecimiento de la enseñanza reglada del periodismo y finaliza con un análisis de su situación en los planes de estudio actuales que revela que el conocimiento teórico y práctico de los géneros sigue siendo un objetivo primordial en la formación de futuros periodistas en España

Bibliografía seleccionada sobre educación superior para el desarrollo humano y social

Esta bibliografía contiene una selección de la literatura disponible sobre el rol de la Educación Superior, de sus instituciones, y su aporte al desarrollo humano y social en el contexto de la globalización.Peer Reviewe

La glocalización de la comunicación

Actualmente se está haciendo cada vez más patente la existencia de una doble y simultánea tendencia de la comunicación en este nuevo siglo. Se trata del fenómeno de la globalización y de la atención a lo local, dos caras dentro del mismo mundo informativo. Lo local busca su espacio en la proximidad, mientras que la tecnología y la economía nos conducen a un escenario que cada vez tiene menos barreras. Ese proceso generalizado, con las paradojas y contradicciones que conlleva, viene siendo aquello a lo que algunos estudiosos de la comunicación hacen referencia a través del neologismo inglés glocalization.The existence of a double and simultaneous tendency in communication of this century is gettting increasingly obvious. This tendency consists of the phenomenon of globalization and the attention to the local environment, two sides of the world of information. The local environment is based on proximity, whereas technology and economy lead us to a global scene with less and less barriers. This general process, with all its contradictions, is what some scholars in communication now define as glocalization

The quantum ground state of self-organized atomic crystals in optical resonators

Cold atoms, driven by a laser and simultaneously coupled to the quantum field of an optical resonator, can self-organize in periodic structures. These structures are supported by the optical lattice, which emerges from the laser light they scatter into the cavity mode, and form when the laser intensity exceeds a threshold value. We study theoretically the quantum ground state of these structures above the pump threshold of self-organization, by mapping the atomic dynamics of the self-organized crystal to a Bose-Hubbard model. We find that the quantum ground state of the self-organized structure can be the one of a Mott-insulator or a superfluid, depending on the pump strength of the driving laser. For very large pump strengths, where the intracavity intensity is maximum and one would expect a Mott-insulator state, we find intervals of parameters where the system is superfluid. These states could be realized in existing experimental setups.Comment: 11 pages, 4 figure