Almost flat K-theory of classifying spaces

We give a rigorous account and prove continuity properties for the correspondence between almost flat bundles on a triangularizable compact connected space and the quasi-representations of its fundamental group. For a discrete countable group $\Gamma$ with finite classifying space $B\Gamma$, we study a correspondence between between almost flat K-theory classes on $B\Gamma$ and group homomorphism $K_0(C^*(\Gamma))\to \mathbb{Z}$ that are implemented by pairs of discrete asymptotic homomorphisms from $C^*(\Gamma)$ to matrix algebras.Comment: 24 pages, 4 figure

Change and development in the Spanish wine industry, 1950-2009

In recent years the European winegrowing regions have been carrying out deep changes in response to increasing international competition, outstanding the case of Spain. This study analyses the main sequences of changes the Spanish wine industry has undergone: the evolution of consumption; the role of exports; the spread of marketing and business organization; the factors that have been involved in the modernization of the wineries. An initial valuation leads us to conclude that it has been an authentic wine revolution in reference to the transformations that have occurred in a period of farming changes and technological modernization for the businessesWine industry revolution, technological modernization, enological change, Spain, twentieth century.

Dynamical spacetimes and gravitational radiation in a Fully Constrained Formulation

This contribution summarizes the recent work carried out to analyze the behavior of the hyperbolic sector of the Fully Constrained Formulation (FCF) derived in Bonazzola et al. 2004. The numerical experiments presented here allows one to be confident in the performances of the upgraded version of CoCoNuT's code by replacing the Conformally Flat Condition (CFC) approximation of the Einstein equations by the FCF.Comment: 4 pages, 7 figures. Accepted for publication in Journal of Physics: Conference Series, Proceedings of the 8th Edoardo Amaldi Conference on Gravitational Wave

The relationship between height and economic development in Spain. A historical perspective

This paper investigates the relationship between height and economic development in Spain in the modern period. The relation is investigated using recently constructed times series with recruitment data of conscripts. We observed changes in average height along the analyzed period. These variations could be explained by different indicators of economic development such as consumption of hygiene products, the deflator of private consumption, income per capìta, schooling rate, infant mortality and trade (degree of openness). We model human stature as a Vector Autoregressive Model (VAR) and we proceed to estimate a Vector Autoregressive Equilibrium Correction Model (VECqM) to quantify the height response to different changes in the different explanatory variables. The analysis shows that there is a long-°©‐run relationship between height, income, and other indicators of economic development in Spain as consumption of hygiene products, and the degree of opennessHeight, health, income, education, economic development, cointegration, Spain.

An excision scheme for black holes in constrained evolution formulations: spherically symmetric case

Excision techniques are used in order to deal with black holes in numerical simulations of Einstein equations and consist in removing a topological sphere containing the physical singularity from the numerical domain, applying instead appropriate boundary conditions at the excised surface. In this work we present recent developments of this technique in the case of constrained formulations of Einstein equations and for spherically symmetric spacetimes. We present a new set of boundary conditions to apply to the elliptic system in the fully-constrained formalism of Bonazzola et al. (2004), at an arbitrary coordinate sphere inside the apparent horizon. Analytical properties of this system of boundary conditions are studied and, under some assumptions, an exponential convergence toward the stationary solution is exhibited for the vacuum spacetime. This is verified in numerical examples, together with the applicability in the case of the accretion of a scalar field onto a Schwarzschild black hole. We also present the successful use of the excision technique in the collapse of a neutron star to a black hole, when excision is switched on during the simulation, after the formation of the apparent horizon. This allows the accretion of matter remaining outside the excision surface and for the stable long-term evolution of the newly formed black hole.Comment: 14 pages, 9 figures. New section added and changes included according to published articl

Maximal slicings in spherical symmetry: local existence and construction

We show that any spherically symmetric spacetime locally admits a maximal spacelike slicing and we give a procedure allowing its construction. The construction procedure that we have designed is based on purely geometrical arguments and, in practice, leads to solve a decoupled system of first order quasi-linear partial differential equations. We have explicitly built up maximal foliations in Minkowski and Friedmann spacetimes. Our approach admits further generalizations and efficient computational implementation. As by product, we suggest some applications of our work in the task of calibrating Numerical Relativity complex codes, usually written in Cartesian coordinates.Comment: 25 pages, 6 figure

La huella hídrica del bambú gigante (Dendrocalamus asper) como indicador de sustentabilidad en la construcción

A medida que el uso de recursos hídricos por parte del ser humano incrementa gracias al aumento de la demanda y el uso industrial, es necesario buscar indicadores que faciliten cuantificar el aprovechamiento del agua y la contaminación involucrada detrás de la producción y fabricación de bienes de consumo. En particular para aquellos bienes que requieren mucha agua para su producción y que por ende estarían afectando negativamente los recursos hídricos disponibles, como es el caso de materiales usados para construcción provenientes de recursos madereros y similares. El objetivo del presente estudio es determinar la cantidad de agua necesaria para producir bambú gigante (Dendrocalamus asper) como materia prima en la construcción, aplicando los conceptos de Hoekstra et al (2012) para el cálculo de la Huella Hídrica como indicador de uso y aprovechamiento del agua. El estudio demuestra que si bien se requiere de una alta cantidad de agua para obtener bambú gigante como materia prima, el cultivo puede ser considerado sustentable y amigable al medioambiente debido a que tiene un menor uso de agua en comparación a otras especies madereras del país usadas con el mismo fin. © 2016. All rights reserved