Teología y Derecho canónico.

Material incluido en el volumen especial de la revista del Instituto Martín de Azpilcueta, Universidad de Navarra : Ius Canonicum (1999), en honor de Javier Hervada

A positioning algorithm for SPH ghost particles in smoothly curved geometries

An algorithm to place ghost particles across the domain boundary in the context of Smoothed Particle Hydrodynamics (SPH) is derived from basic principles, and constructed for several simple, three-dimensional, geometries. The performance of the algorithm is compared against the more commonly used ‘‘mirrored with respect to the local tangent plane" approach and shown to converge to it whenever the distance of the particles to the reflecting boundary is much smaller than a local measure of the surface’s curvature. The algorithm is demonstrated, tested and compared against the usual approach via simulations of a compressible flow around a cylinder, and the numerical cost of implementing it is addressed. We conclude that use of ghost particles to enforce boundary conditions is not only viable in the presence of smoothly curved boundaries, but more robust than the usual method for low-resolution scenarios.This research was sponsored in part by the DGICYT (Dirección General de Investigaciones Científicas y Tecnológicas) of Spain under National Project No. ENE2015-68265. Research was also funded in part by the Erasmus Mundus Program: International Doctoral College in Fusion Science and Engineering FUSION-DC, Spain

Major results from the first plasma campaign of the Wendelstein 7-X stellarator

After completing the main construction phase of Wendelstein 7-X (W7-X) and successfully commissioning the device, first plasma operation started at the end of 2015. Integral commissioning of plasma start-up and operation using electron cyclotron resonance heating (ECRH) and an extensive set of plasma diagnostics have been completed, allowing initial physics studies during the first operational campaign. Both in helium and hydrogen, plasma breakdown was easily achieved. Gaining experience with plasma vessel conditioning, discharge lengths could be extended gradually. Eventually, discharges lasted up to 6 s, reaching an injected energy of 4 MJ, which is twice the limit originally agreed for the limiter configuration employed during the first operational campaign. At power levels of 4 MW central electron densities reached 3 x 1019 m-3, central electron temperatures reached values of 7 keV and ion temperatures reached just above 2 keV. Important physics studies during this first operational phase include a first assessment of power balance and energy confinement, ECRH power deposition experiments, 2nd harmonic O-mode ECRH using multi-pass absorption, and current drive experiments using electron cyclotron current drive. As in many plasma discharges the electron temperature exceeds the ion temperature significantly, these plasmas are governed by core electron root confinement showing a strong positive electric field in the plasma centre.This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the EURATOM research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission

Magneto-hydrodynamical nonlinear simulations of magnetically confined plasmas using smooth particle hydrodynamics (SPH)

The successful application of techniques inspired in Smoothed Particle Hydrodynamics (SPH) to magnetohydrodynamical (MHD) nonlinear simulations of magnetically confined plasmas requires the previous solution to a number of challenging issues that are still not fully resolved, namely, the construction of precise, arbitrary initial conditions in complicated geometries, the formulation of adequate boundary conditions for the magnetic field, and the correct treatment of three-dimensional toroidal boundaries of the arbitrary shape. In this paper, we present an SPH implementation of the nonlinear MHD equations that include our proposed solution to these issues and test its performance on a broad selection of nonlinear MHD problems: (1) the propagation of circularly polarized Alfven waves, (2) the occurrence of magnetic reconnection for a Harris current-sheet, and (3) the nonlinear MHD stability properties of various cylindrical pinches.This research was sponsored by DGICYT (Dirección General de Investigación Científica y Técnica) under Project No. ENE2015-68265, MINECO (Ministerio de Economía y Competitividad) under Project No. UNC313-4E-2361, and the Erasmus Mundus Program: International Doctoral College in Fusion Science and Engineering FUSION-DC

Arquitectura popular en el valle del Tiétar

En número dedicado a: Avila: Valle del Tiéta

El patrimonio arquitectónico construido con tierra. Las aportaciones historiográficas y el reconocimiento de sus valores en el contexto de la arquitectura popular española

Artículo de investigación en el que se hace un análisis historiográfico con relación al estudio y la valoración de la arquitectura y construcción con tierra en España

La arquitectura negra en la comarca del Ocejón (Guadalajara)

Las numerosas muestras de la construcción tradicional que se han conservado en distintas localidades de la Sierra de Ayllón (especialmente en la provincia de Guadalajara, pero también en las limítrofes de Madrid y de Segovia) y que reciben el nombre de arquitectura negra por el uso predominante de la pizarra como material de construcción, forman uno de los conjuntos más singulares dentro de la arquitectura popular española. Estas formas, materiales y sistemas tradicionales de construir –que se extienden, con pequeñas diferencias, tanto en la vertiente occidental como en el área oriental del pico Ocejón (que con sus 2048 m es el de mayor altura de la provincia de Guadalajara y la referencia geográfica indiscutible de este grupo de localidades)– constituyen uno de los elementos más importantes y reconocibles del paisaje serrano del Ma- cizo de Ayllón y nos permiten comprender y aproximarnos, a través de sus numerosos valores, al soporte ambiental, social, económico y cultural que las hizo posibles

La protección del patrimonio arqueológico

Trabajo académico sobre los sistemas de protección, gestión y tutela del patrimonio arqueológico en el ámbito de la ciudad y de la construcción histórica

Estrategia y metodología de la intervención en edificios históricos. Una perspectiva desde la arquitectura y la arqueología

Estrategia y metodología de la intervención en edificios históricos. Una perspectiva desde la arquitectura y la arqueologí