O projecto de investigaçâo de Garganta Canaleja: aproximaçâo à análise do Epipaleolítico e o Neolítico no vale interior do Tejo

Aportaciones recientes al conocimiento del Neolítico y Calcolítico en Extremadura y Alentejo.-- Actas de las Jornadas de Arqueología del Museo de Cáceres (2007).[ES]: Se presentan resultados preliminares sobre el proyecto de investigación que se realiza en la Garganta Canaleja (Romangordo, Cáceres). Durante el desarrollo de los trabajos de excavación se documentaron sepulcros colectivos con una amplia trayectoria cronológica durante el IV y III milenio cal BC. Bajo ellos subyacen ocupaciones más antiguas del Epipaleolítico y el Neolítico Antiguo que se convierten en las primeras referencias de estos periodos en los riberos del río Tajo. Se presentan nuevas dataciones absolutas y algunas aportaciones paleoambientales.[PT]: Apresentam-se resultados preliminares do projecto de investigaçâo que está a ser realizado na Garganta Canaleja (Romangordo, Cáceres). Durante o desenvolvimento dos trabalhos de escavaçâo foram documentados sepulcros coletivos com urna ampla trajectória cronológica que en volve o IVº e o IIIº milénio cal BC. Abaixo deles bá algumas ocupayçôes mais antigas do Epipaleolítico e o Neolítico Antigo, que se cooverteram nas primeiras manifestaçôes destes períodos nos ribeiros do Tejo. Apresentam-se novas dataçôes absolutas e algumas aportaôes ao estudo do paleoambiente.Peer reviewe

Combustion of Soya Oil and Diesel Oil Mixtures for Use in Thermal Energy Production

Producción CientíficaIn August 2005, Spain approved the Plan for Renewable Energy Sources for the period 2005-2010 (P.E.R.), including co-combustion installations. Co-combustion in the P.E.R. aims to increase power output by 12,185.3 GWh in five years and shows great interest in studies of the combustion of mixtures of fossil and bio-combustible fuels. This paper presents studies of the co-combustion of soya oil and diesel for thermal heating. The paper begins with a characterization of soya oil as well as mixtures of this oil, with diesel, as fuels. The combustion of the soya oil mixtures and diesel is made in an installation, where the pressure of injection as well as the air volume of the burner can be changed. The obtained results inside to be the environmental average legislation and a greater efficiency of combustion is found. The conclusions show that the use of mixtures of soya oil and Diesel for producing thermal energy in conventional equipment is feasible

El yacimiento de Sierra de la Pepa (La Cumbre, Cáceres). Apuntes sobre el proceso transicional del neolítico final al calcolítico en Extremadura

Trabajo presentado al IV Congreso del Neolítico Peninsular, celebrado en Alicante (España) del 27 al 30 de noviembre de 2006.[ES]: En el yacimiento de la Sierra de la Pepa (La Cumbre, Cáceres) hemos documentado un episodio de ocupación conectado a la fase transicional del Neolítico Final-Calcolítico. En este artículo se pretende analizar la importancia de determinados ítems artefactuales como base de la identifi cación cultural, en un intento de explicar la forma en que se produce dicha transición en una región como la extremeña, donde, hasta la fecha, aún se depende de los materiales del registro arqueológico. Se incidirá en la problemática suscitada en torno a la estimación cronológica de las ocupaciones del IV y III milenio cal BC y en otros aspectos tales como las evidencias de orden paleoambiental, que de manera decisiva contribuirán a recrear el modelo de explotación del paisaje. Al hilo de esas hipótesis se proponen nuevas refl exiones sobre el registro conocido, en una dimensión regional de yacimientos adscritos a este segmento cultural.[EN]: At Sierra de la Pepa we have documented a settlement dated on the transition from Late Neolithic to Chalcolithic. Our aim is to analyze the importance of some artefacts as on the cultural interpretation of this period, trying to explain how this transition is produced in Spanish Extremadura, where the interpretation still depends on artefacts from archaeological record. We emphasize on the debate about the chronological aspect from IVth and IIIrd millennia occupations, and some other features such us paleoenvironmental evidence which would help to recreate the pattern of landscape use. New reflections on archaeological record in a regional framework are proposed from settlements dated in this cultural framework.Peer Reviewe

Performance of Sustainable Mortars Made with Filler from Different Construction By-Products

One way to contribute to sustainability in the construction sector is through the incorporation of construction by-products from their own activities. This work intends to extend the possibilities for enhancement of these by-products through the incorporation of four different ones, as fillers, in mortar production. The influence of these incorporations in mortar production was compared with a reference mortar with siliceous filler in its fresh state; workability, entrained air content and fresh density, and in its hardened state; capillary water absorption, water vapour permeability and shrinkage (up to 91 days); and adhesive, compressive, and flexural strength; the last two were studied over time (up to 180 days). Despite the reduction in compressive strength, both in the short and long term, there was a gain in adhesive strength when the construction by-products were incorporated. Regarding the physical properties and durability studied, no relevant differences were found with respect to the reference mortar. According to the European Specifications, these mortars could be used as regular or coloured rendering and plastering mortars, and masonry mortars, and these findings promote the circular economy in the construction sector

Elasto-plastic hardening models adjustment to ferritic, austenitic and austenoferritic Rebar

The elastoplastic behaviour of steel used for structural member fabrication has received attention to facilitate a mechanical-resistant design. New Zealand and South African standards have adopted various theoreti-cal approaches to describe such behaviour in stainless steels. With respect to the building industry, describing the tensile behaviour of steel rebar used to produce reinforced concrete structures is of interest. Differences compared with the homogenous material described in the above mentioned standards and related literatures are discussed in this paper. Specifically, the presence of ribs and the TEMPCORE® technology used to produce carbon steel rebar may alter the elastoplastic model. Carbon steel rebar is shown to fit a Hollomon model giving hardening exponent values on the order of 0.17. Austenitic stainless steel rebar behaviour is better described using a modified Rasmussen model with a free fitted exponent of 6. Duplex stainless steel shows a poor fit to any previous model.Ajuste de los aceros corrugados ferríticos, austeníticos y austenoferríticos a los modelos de endureci-miento elastoplástico por deformación. Uno de los principales factores tenidos en cuenta en la fabricación de aceros estructurales es su comportamiento durante la fase elastoplástica o de endurecimiento por deformación. Normas neozelandesas y sudafricanas plantean diversas aproximaciones teóricas para describir dicho comportamiento en el caso de los aceros inoxidables. En el campo de la construcción resulta de interés la descripción del comporta-miento tenso-deformacional de los aceros corrugados utilizados en las estructuras de hormigón armado. En este artículo se discuten los modelos planteados en las normas citadas anteriormente así como los existentes en la litera-tura tanto para los aceros corrugados inoxidables como para los aceros al carbono fabricados mediante el proceso denominado TEMPCORE® Los aceros TEMPCORE® analizados arrojan un valor del exponente de endureci-miento por deformación según el modelo de Hollomon de 0.17. Los aceros inoxidables austeníticos se ajustan mejor al modelo de Rasmussen presentando un exponente de valor 6 realizando un ajuste libre de la función correspondiente. Para los aceros inoxidables Dúplex se obtienen muy bajos ajustes para los dos modelos citados

Comparison data between hybrid and galvanic anode installation in the Arousa Island Bridge

The Arousa Island Bridge, with its 1980 m is the only road access to the Arousa Island. Built in 1985, this single-cell box girder divided in 40 spans runs entirely on the sea. The deck is between 2 to 12 m above sea level, so after 25 years in a marine environment, the structure showed reinforcement corrosion, especially in piles and deck bottom. Attending to the corrosion damages, caused simply from a chloride attack, the local government decided to intervene with an ambitious repair project. This decision has been taken only after an exhaustive cost analysis to determine the feasibility of repairing the structure against the construction of a new one. In this project, the reparation was divided in three types of intervention: conventional reparation with patches, galvanic anode installation and hybrid anode installation. The objective of this division is the data collection for further repairs. The research will be explained in detail and the comparative results will be explained in depth, therefore examining the corrosion progresion and service life. Currently, after careful analysis of examining the last 6 years of data, the hybrid anode installation is the system with the better initial results. Though with the evolution of the years, the galvanic anode installation is just as effective

Analytical transient-time solution for temperature in non perfused tissue during radiofrequency ablation

[EN] Radiofrequency ablation (RFA) with internally cooled needle-like electrodes is a technique widely used to destroy cancer cells. In a previous study we obtained the analytical solution of the biological heat equation associated with the RFA problem in perfused tissue, i.e. when the governing equation which models the temperature distribution in tissue includes the blood perfusion therm. We also found that under these circumstances the temperature profiles always reach a steady state (limit temperature). However, the analytical solution of the RFA thermal problem without perfusion (e.g. conducted on an organ in which atraumatic vascular clamping is performed to temporally interrupt blood perfusion), cannot be directly obtained by setting the blood perfusion term to zero in the previously obtained solution. In fact, it is necessary to address the mathematical resolution in a totally different way. Our goal was to obtain the analytical expression of the temperature distribution in an RFA process with internally cooled needle-like electrodes when the biological tissue is not perfused. We consider two spatial domains: A finite domain which represents the real situation, and an infinite domain, which only makes sense from a mathematical point of view and which has been traditionally employed in analytical studies. Even though considering infinite time is not realistic, these approaches are surely worth considering in order to understand what happens "far from the electrode" or for "very long periods of time." The results indicate that the temperature value is finite both when the spatial domain is finite (which implies that a steady state is reached), and when time is finite for any spatial domain. From this it can be concluded that a steady state is never reached if the spatial domain is infinite. (C) 2016 Elsevier Inc. All rights reserved.This work received financial support from the Spanish "Plan Estatal de Investigacion, Desarrollo e Innovacion Orientada a los Retos de la Sociedad" under Grant TEC2014-52383-C3-R (TEC2014-52383-C3-1-R).López Molina, JA.; Rivera Ortun, MJ.; Berjano Zanón, E. (2016). Analytical transient-time solution for temperature in non perfused tissue during radiofrequency ablation. Applied Mathematical Modelling. 42:618-635. https://doi.org/10.1016/j.apm.2016.10.044S6186354

Adecuación de espacios fluviales del Bajo Guadalquivir como nuevos lugares públicos de la ciudad - territorio

Los espacios abiertos para el recreo de los habitantes de la ciudad actual no deben restringirse a franjas de parques aislados en el interior de los cascos urbanos y al conjunto de plazas públicas, sino que hemos de aspirar a disfrutar del paisaje de toda una región pensado como espacio público. Para registrar el territorio compatibilizando su ordenación como parte sustancial del sistema de espacios públicos de la Ciudad - Territorio actual. En la intención de dotar de espacios públicos a la ciudad extendida en el territorio, siendo éste el objetivo de esta investigación sobre la planificación de la ciudad contemporánea indagamos sobre los posibles nuevos lugares públicos no aisladamente, sino como sistema que estructura el conjunto y esté a su escala. Es por ello que fijamos nuestra atención sobre los elementos geográficos lineales de gran continuidad espacial, en la convicción de que son los lugares con vocación para convertirse en los elementos primarios que den orden estructural y claridad a la progresiva extensión territorial de la ciudad, al mismo tiempo que se convierten en los nuevos lugares emblemáticos y representativos de la ciudadanía; como nuevos valores sociales de su progresivo desarrollo. El Bajo Guadalquivir constituye un verdadero eje geográfico y en correspondencia se convierte en “eje de vertebración política” de su territorio. Para ilustrar el extraordinario patrimonio del medio natural se analiza una colección espacios fluviales inmersos en la cuenca fluvial del Bajo Guadalquivir, al objeto de valorarlos en su conjunto y en sus singularidades dentro de sus respectivos ámbitos paisajísticos.The recreational open spaces for inhabitants of cities today should not be restricted to isolated strips of parks and public squares within urban areas - we must think of the entire region’s landscape as public space. We should reconcile its natural and productive nature with public use, understanding the whole territorial system as part of a larger City - Territory Public Space. The objective of this research on the contemporary city planning is to provide public spaces to the city that sprawls into the territory, thus we investigate possible new public places, not individually but as part of a whole system that structures the whole, making them more coherent at a large scale. That is why we focus on geographical elements with linear features and spatial continuity, as we believe that they are, not only the best suited places to become elements of structure in the territorial expansion of the city, but also new iconic and symbolic sites of its inhabitants. The Lower Guadalquivir is a true geographical axis, and it consequently becomes “axis for political structuring” of the territory. As an example of its extraordinary environmental heritage we analyze a group of “Fluvial Areas” situated in Lower Guadalquivir, to study them as a whole and separately, unveiling their uniqueness within their respective landscaped areas