Diseño de una e–actividad para Seguridad Informática

En este artículo se presenta un estudio de caso, diseñado para ser utilizado en la materia Seguridad Informática o similar. Este tipo de actividad, también denominada método de caso, es un tipo de e–actividad que se caracteriza por utilizar una situación real sobre la que los alumnos trabajan y discuten para llegar a conclusiones. En este estudio concreto utilizaremos una noticia real sobre ataques de seguridad en Internet, para que los alumnos debatan sobre temas como la responsabilidad de una configuración segura, el papel de los proveedores de acceso o las consecuencias legales para los hackers. También se pedirá a los alumnos que elaboren una guía de configuración segura.Peer Reviewe

A robust model for rapidly varying flows over movable bottom with suspended and bedload transport: modelling and numerical approach

We propose a coupled model for suspended and bedload sediment transport in the shallow water framework. The model is deduced under hydrostatic pressure assumptions and will not assume any Bossinesq hypothesis. The numerical resolution is carried out in a segregated way. First the underlying system of conservation laws is solved by using a first order path-conservative Riemann solver. Then, the source terms corresponding with the erosion and depositions rates are approximated in a semi-implicit way. The final scheme preserves the positivity of the density. Several numerical experiments were carried out in order to validate the model and the numerical scheme. The results obtained are in good agreement with the experimental data

Béne wha lhall, béne lo ya'a: identidad y etnicidad en la Sierra Norte Zapoteca de Oaxaca

The aim of this doctoral thesis is to contribute to a better understanding of the issue of ethnic identity of the Zapotecs in the Sierra Norte of the Mexican State of Oaxaca, and to contribute to an indigenous criticism aiming at decolonizing cultural memories and social realities in México and the Americas. In discussing the reality of a specific indigenous people today, we are confronted with important questions, not only: ¿Who are the Zapotecs in the Sierra Norte of the Mexican State of Oaxaca, what are their characteristics?, but also How do they represent themselves and construct their cultural identity in their own terms? How do the processes of identity formation take place within a context of imposed and stigmatized ‘alterity’? How are forms of ethnic representation created and recreated in a situation of coloniality and social inequality? How is ethnic identity constructed in a framework of modernity and globalization: which role do cultural memory and worldview play in this?LEI Universiteit LeidenAdelaar W.F.H., Cammarota A., Geurds A., Hofman C.L., Schüren U., Wiesebron M.L.Mesoamerican and Andean Archaeolog

Deterministically Driven Avalanche Models of Solar Flares

We develop and discuss the properties of a new class of lattice-based avalanche models of solar flares. These models are readily amenable to a relatively unambiguous physical interpretation in terms of slow twisting of a coronal loop. They share similarities with other avalanche models, such as the classical stick--slip self-organized critical model of earthquakes, in that they are driven globally by a fully deterministic energy loading process. The model design leads to a systematic deficit of small scale avalanches. In some portions of model space, mid-size and large avalanching behavior is scale-free, being characterized by event size distributions that have the form of power-laws with index values, which, in some parameter regimes, compare favorably to those inferred from solar EUV and X-ray flare data. For models using conservative or near-conservative redistribution rules, a population of large, quasiperiodic avalanches can also appear. Although without direct counterparts in the observational global statistics of flare energy release, this latter behavior may be relevant to recurrent flaring in individual coronal loops. This class of models could provide a basis for the prediction of large solar flares.Comment: 24 pages, 11 figures, 2 tables, accepted for publication in Solar Physic

IFCP Riemann solver: Application to tsunami modelling using GPUs

In this work, we present a simplified two-layer model of Savage-Hutter type to simulate tsunamis generated by landslides (see (Fern´andez et al. 2008)). A layer composed of fluidized granular material is assumed to flow within an upper layer composed of an inviscid fluid (e.g. water). The sediment layer ismodelled by a Savage-Hutter type model where buoyancy effects have been considered. The system is discretized using IFCP finite volume scheme. The first order IFCP scheme was introduced in (Fern´andez et al. 2011) and it is constructed by using a suitable decomposition of a Roe matrix by means of a parabolic viscosity matrix, that captures information of the intermediate fields (Intermediate Field Capturing Parabola). Its extension to high order and two-dimensional domains is straightforward. To conclude, some numerical examples are presente

The symmetry of the superconducting order parameter in PuCoGa5_5

The symmetry of the superconducting order parameter in single-crystalline PuCoGa$_5$ ($T_{\rm c} = 18.5$ K) is investigated via zero- and transverse- field muon spin relaxation ($\mu$SR) measurements, probing the possible existence of orbital and/or spin moments (time reversal-symmetry violation TRV) associated with the superconducting phase and the in-plane magnetic-field penetration depth $\lambda(T)$ in the mixed state, respectively. We find no evidence for TRV, and show that the superfluid density, or alternatively, $\Delta\lambda(T) = \lambda(T) - \lambda(0)$, are $\propto T$ for $T/T_{\rm c} \leq 0.5$. Taken together these measurements are consistent with an even-parity (pseudo-spin singlet), d-wave pairing state.Comment: 4 pages, 5 figure

Evaluation of motivational stages and processes of change for weight management in obesity and after bariatric surgery

Poster abstrac