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Search Results: 1 - 10 of 244773 matches for " Alberto López Rodríguez "
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Application of UV-Spectroscopy in Benzene analysis
Alberto Rodríguez,Beatriz E. López
Revista de la Sociedad Química de México , 1997,
Abstract:
Proposals for Flashflood Management in Western Argentina. Case Study: The Metropolitan Area of Greater Mendoza  [PDF]
Alberto I. J. Vich, Mariela López Rodríguez, Carolina Lauro, Emilce Vaccarino
Current Urban Studies (CUS) , 2014, DOI: 10.4236/cus.2014.21004
Abstract:

The watersheds located in west of Greater Mendoza (Argentina) are typical examples of areas directly or indirectly affected by flashfloods. Greater Mendoza is encroaching upon areas with a pronounced relief (eastern slope of the Precordillera, the piedmont and other minor units) with strong human pressures on a fragile environment. Nowadays, the western part of Greater Mendoza is covered with paved surfaces and buildings, jeopardizing the city located downstream. In order to mitigate the negative effects of the use and occupation of the piedmont, a set of structural and non-structural measures and an urban planning model, with new urban development and architecture proposals, have been devised. These measures involve flood control, erosion control, afforestation, habitat management, control of extraction practices (aggregates, wildlife, vegetation, etc.) and education. The new urban planning model is based on the preservation of the natural character of the land and on appropriate management of surplus water (runoff detection at the source area, drainage system retention, increasing drainage capacity while minimizing impacts on downstream environments, and creation of areas to buffer runoff). Many of these measures were developed and successfully demonstrated locally.

Empresa bajo incertidumbre en el precio: modelo con dos destinos y un mercado de futuros
Rodríguez Puerta, Inmaculada,álvarez López, Alberto A.
Rect@ , 2008,
Abstract: En este trabajo se desarrolla un modelo para una empresa competitiva que produce una cantidad determinada de un bien, la cual debe repartir entre dos fines distintos, para los que se tienen diferentes precios. La empresa debe decidir la cantidad que destinará a cada fin antes de conocer el precio para uno de ellos; para este fin, existe además un mercado de futuros, por lo que también debe decidir la cantidad que venderá en ese mercado. Tras presentar el modelo, se interpretan económicamente las diferentes soluciones del problema, y se estudian algunas de sus propiedades.
Empresa bajo incertidumbre en el precio: Modelo con dos productos
Rodríguez Puerta, Inmaculada,álvarez López, Alberto
Rect@ , 2007,
Abstract: En este trabajo, se desarrolla un modelo para una empresa competitiva que produce una cantidad determinada de un bien, la cual debe repartir entre dos fines distintos, para los que se tienen diferentes precios. La empresa debe decidir la cantidad que destinará a cada fin antes de conocer el precio para uno de ellos. Tras presentar el modelo, se determina una condición para que la empresa decida destinar al fin incierto una cantidad positiva. A continuación, se analiza el efecto que produce un aumento del riesgo del precio incierto en las decisiones de la empresa.
La situación actual y de futuro de un vino joven: la denominación de origen Rías Baixas
Paula Vázquez Rodríguez,Alberto Gayo López
Revista Galega de Economía , 2001,
Abstract: Espa a es uno de los países de Europa occidental que cuenta con una mayor tradición vitivinícola. La gran variedad de suelos y de climas ha incentivado una extensa gama de vinos, cada uno de ellos marcado por una personalidad diferente. Todas esas circunstancias determinaron en su día la necesidad de reglamentar estos vinos con denominaciones de origen para protegerlos, regular la producción y garantizar la calidad. El mayor patrimonio de la denominación de origen Rías Baixas radica en ser capaces de proporcionar vinos de una enorme calidad, lo que les permite competir con los mejores y más prestigiosos vinos blancos del mundo. El esfuerzo colectivo y la búsqueda de calidad hizo posible que en 1988 se aprobase el reglamento de la denominación de origen Rías Baixas.
Generalizing the Convex Hull of a Sample: The R Package alphahull
Beatriz Pateiro-López,Alberto Rodríguez-Casal
Journal of Statistical Software , 2010,
Abstract: This paper presents the R package alphahull which implements the α-convex hull and the α-shape of a finite set of points in the plane. These geometric structures provide an informative overview of the shape and properties of the point set. Unlike the convex hull, the α-convex hull and the α-shape are able to reconstruct non-convex sets. This flexibility make them specially useful in set estimation. Since the implementation is based on the intimate relation of theses constructs with Delaunay triangulations, the R package alphahull also includes functions to compute Voronoi and Delaunay tesselations. The usefulness of the package is illustrated with two small simulation studies on boundary length estimation.
Recovering the shape of a point cloud in the plane
Beatriz Pateiro-López,Alberto Rodríguez Casal
Statistics , 2011,
Abstract: In this work we deal with the problem of support estimation under shape restrictions. The shape restriction we deal with is an extension of the notion of convexity named alpha-convexity. Instead of assuming, as in the convex case, the existence of a separating hyperplane for each exterior point we assume the existence of a separating open ball with radius alpha. Given an alpha-convex set S, the alpha-convex hull of independent random points in S is the natural estimator of the set. If alpha is unknown the r_n-convex hull of the sample can be considered. We analyze the asymptotic properties of the r_n-convex hull estimator in the bidimensional case and obtain the convergence rate for the expected distance in measure between the set and the estimator. The geometrical complexity of the estimator and its dependence on r_n is also obtained via the analysis of the expected number of vertices of the r_n-convex hull.
Estudio comparativo entre un proceso fisicoquímico y uno biológico para tratar agua residual de rastro
López López,Alberto; Barrera Fraire,Jorge; Vallejo Rodríguez,Ramiro; Barahona Argueta,Carlos;
Interciencia , 2008,
Abstract: a comparative study between physicochemical and biological processes to treat slaughterhouse wastewater was carried out at the laboratory level. the physicochemical treatment consisted of a coagulation-flocculation process, using alum as coagulant and an anionic polymer as flocculant. the best observed chemical oxygen demand (cod) removal efficiency was 94% with 250mg·l-1 of alum and 5mg·l-1 of anionic polymer and ph=4. on the other hand, the biological process consisted of sequentially coupled anaerobic/aerobic (an/ar) treatments using an anaerobic filter (af) and a sequencing batch reactor (sbr), respectively. the af operated with organic loadings (ol) ranging from 3.7 to 16.5kg·m-3·d-1. the efficiencies of cod removal ranged 50-81% and were inversely proportional to the ol value. the organic matter (om) degradation by aerobic treatment in the sbr followed pseudo-first-order kinetics with respect to om concentration. the removal of cod by the coupled af+sbr was 97% at a hydraulic retention time of 20h in the af and 9h of aeration in the sbr.
Electromigration separation of 95 Zr ionic species from nitric acid solutions
Beatriz E. López,Alberto Rodríguez,José L. Iturbe,Enrique Martínez
Revista de la Sociedad Química de México , 1997,
Abstract:
Evaluación Químico-Nutricional de Lupinus exaltatus Zucc, del Nevado de Colima, México, como fuente potencial de forraje
Ruiz López,Mario Alberto; Rodríguez Macías,Ramón; Navarro Pérez,Sonia;
Interciencia , 2006,
Abstract: with the purpose of studying the forage potential of lupinus exaltatus, neutral detergent fiber (ndf), acid detergent fiber (adf), non-protein nitrogen (npn), alkaloids and in situ digestibility of seed, foliage, mature pod and whole plant were evaluated in samples from el nevado de colima, mexico. seed protein content was 38.41 ±0.48% with digestibility of 70 ±3.0% and levels of npn of 1.0 ±0.02%, but high alkaloid content (2.1 ±0.05%). likewise, foliage showed a protein content of 23.5 ±0.9% and fiber content of 26.5 ±1.2%, ndf of 55.3 ±1.7 and adf of 34.8 ±0.8%, as well as the highest organic matter digestibility (60.0 ±2.3%) and the lowest levels of npn (0.6 ±0.01%) and alkaloids (1.0 ±0.018%). the whole plant had similar values as foliage. pods were the lowest in protein content (8.5 ±0.3%) and protein digestibility (26.0 ±1.2%), but the highest in fiber content (52.4 ±0.3%), ndf (84.1 ±3.0%) and adf (76.5 ±2.8%), and showed low percentages of npn (0.2 ±0.004%) and alkaloids (0.78 ±0.02%). lupinus exaltatus is a good protein source, particularly seeds and foliage, and therefore could be a potential alternative in ruminant diets after alkaloids are reduced or eliminated by physical methods.
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