Functional macroscopic behavior of weighted random ball model

We consider a generalization of the weighted random ball model. The model is driven by a random Poisson measure with a product heavy tailed intensity measure. Such a model typically represents the transmission of a network of stations with a fading effect. In a previous article, the authors proved the convergence of the finite-dimensional distributions of related generalized random fields under various scalings and in the particular case when the fading function is the indicator function of the unit ball. In this paper, tightness and functional convergence are investigated. Using suitable moment estimates, we prove functional convergences for some parametric classes of configurations under the so-called large ball scaling and intermediate ball scaling. Convergence in the space of distributions is also discussed

The merging cluster of galaxies Abell 3376: an optical view

Abell 3376 is a merging cluster of galaxies at redshift z=0.046, famous mostly for its giant radio arcs, and shows an elongated and highly substructured X-ray emission, but has not been analysed in detail at optical wavelengths. We have obtained wide field images of Abell 3376 in the B band and derive the GLF applying a statistical subtraction of the background in three regions: a circle of 0.29 deg radius (1.5 Mpc) encompassing the whole cluster, and two circles centered on each of the two brightest galaxies (BCG2, northeast, coinciding with the peak of X-ray emission, and BCG1, southwest) of radii 0.15 deg (0.775 Mpc). We also compute the GLF in the zone around BCG1, which is covered by the WINGS survey in the B and V bands, by selecting cluster members in the red sequence in a (B-V) versus V diagram. Finally, we discuss the dynamical characteristics of the cluster implied by a Serna & Gerbal analysis. The GLFs are not well fit by a single Schechter function, but satisfactory fits are obtained by summing a Gaussian and a Schechter function. The GLF computed by selecting galaxies in the red sequence in the region surrounding BCG1 can also be fit by a Gaussian plus a Schechter function. An excess of galaxies in the brightest bins is detected in the BCG1 and BCG2 regions. The dynamical analysis based on the Serna & Gerbal method shows the existence of a main structure of 82 galaxies which can be subdivided into two main substructures of 25 and 6 galaxies. A smaller structure of 6 galaxies is also detected. The B band GLFs of Abell 3376 are clearly perturbed, as already found in other merging clusters. The dynamical properties are consistent with the existence of several substructures, in agreement with a previously published X-ray analysis.Comment: 11 pages, 12 figures, accepted for publication in A&

ÉTALEMENT URBAIN, DYNAMIQUES AGRICOLES ET POLITIQUES PERIURBAINES UNE ANALYSE SPATIALE DU LANGUEDOC-ROUSSILLON ET DU PORTUGAL

N° ISBN - 978-2-7380-1284-5International audienceFor almost 40 years cities' peripheries and the coastal areas of Languedoc-Roussillon in France and of Portugal have been known important urban dynamics that affect natural spaces, and most particularly the agricultural areas. These dynamics are due to periurbanization, i.e. the increase of urban sprawl and of spatial fragmentation, thus contributing to important decline of the agriculture land. These dynamics are nowadays considered in spatial policies and planning at different scales by developing, among others, the role of agriculture as a way to deal with urban sprawl. This paper is developed in three steps: a) the spatial analysis of the urban dynamics, specially the mutations of the agriculture lands of Languedoc-Roussillon and of Portugal; b) the analysis of spatial policies and planning at different scales, and of how they are dealing with urban dynamics; c) the analysis of two different local projects – one in Languedoc-Roussillon (Lunel) and the other one in Portugal (Guimarães) – that are trying to enhance the periurban agriculture as a way to combat urban sprawl, thus promoting a more urban and periurban sustainable development

Utilisation de grilles de calcul pour la génomique comparative

International audienceLarge scale phylogenomics and comparative genomics require complex computational methods (parsimony, maximum likelihood, bayesian methods, MCMC, etc.) associated with massively distributed calculation. In this respect, grid computing plays a crucial role. Here we present how we processed exhaustive similarity searches on several millions of sequences with BLAST, using two different grids (TIDRA and GRISBI)

Comment étudier (analyser) la gouvernance territoriale ? Mise à l'épreuve d'une grille de lecture

International audienceDans cet article nous présentons une grille d'analyse de la gouvernance territoriale que nous avons construite dans le cadre d'un projet de recherche pluridisciplinaire à partir d'une définition commune de la gouvernance territoriale. La gouvernance territoriale est devenue une question centrale dans le développement territorial et un enjeu pour l'élaboration des politiques publiques. Elaborer une grille d'analyse sur la gouvernance territoriale ne va pas de soi ; nous illustrerons son opérationnalisation à partir des travaux de terrain réalisés dans trois situations dans la région de Languedoc Roussillon. Les dispositifs et outils sont contextuels et les modes de gouvernances pluriels selon les objectifs et les dynamiques antérieures. Enfin nous en tirerons des enseignements pour l'étude de la gouvernance tant sur la production des connaissances que sur l'opérationnalité de cette grille. / In this paper we present an analytical framework of territorial governance that we built as part of a multidisciplinary research project based on a common definition of territorial governance. Territorial governance has become a central issue in regional development and a challenge for public policy. Develop an analytical framework on territorial governance does not just happen, and we illustrate its operationalization based on fieldwork conducted in three situations in Languedoc-Roussillon. Devices and tools are contextual and plural forms of governance based on the objectives and dynamics earlier. Finally we will draw lessons for the study of governance both in the production of knowledge about the operational capability of the grid

A Wave to Wire model of the SEAREV Wave Energy Converter

International audienceThis paper describes a numerical wave-to-wire model of the second-generation wave energy converter called SEAREV. Governing equations are given in the time domain for the motion of the masses involved in the device and for the hydraulic power take-off (PTO) used to convert the motion into electricity. The hydrodynamic forces are derived using the standard linear potential theory. The memory term in the radiation force is replaced by additional states using the Prony method in order to change the equation of motion into the ordinary differential equation form. The PTO is composed of hydraulic rams, an accumulator, and a hydraulic generator, which delivers electricity when there is enough energy stored in the accumulator.Using the MATLAB Simulink tool, the equation of motion is solved to simulate the full device (including the power take-off) from the incident wave to the electricity delivered to the grid. Simulation results are presented in the paper and comparisons are made with a simpler PTO: a linear damper. They show that the torque applied to the hydraulic PTO must exceed a threshold to start absorbing energy, unlike the linear damping model. They also show that the power production can be very discontinuous, depending on the level of the incident wave power. This is due to the fact that the generator considered can transform the energy stored in the accumulator faster than the energy transmitted by the rams into the accumulator. It could therefore be interesting to use several generators to adapt the electrical energy production to the level of incident wave power, or a generator that could work efficiently at part load in order to achieve continuous energy production

QAnswer: Towards Question Answering Search over Websites

Question Answering (QA) is increasingly used by search engines to provide results to their end-users, yet very few websites currently use QA technologies for their search functionality. To illustrate the potential of QA technologies for the website search practitioner, we demonstrate web searches that combine QA over knowledge graphs and QA over free text -- each being usually tackled separately. We also discuss the different benefits and drawbacks of both approaches for web site searches. We use the case studies made of websites hosted by the Wikimedia Foundation (namely Wikipedia and Wikidata). Differently from a search engine (e.g. Google, Bing, etc), the data are indexed integrally, i.e. we do not index only a subset, and they are indexed exclusively, i.e. we index only data available on the corresponding website