39 research outputs found
Los Poyos del Molinillo (Frigiliana): new site of the Bronze Age in the East AxarquĂa (MĂĄlaga, AndalucĂa)
En este trabajo damos a conocer un nuevo yacimiento descubierto recientemente en el municipio de Frigiliana. La delimitaciĂłn del ĂĄrea denominada Los Poyos del Molinillo permitiĂł definir la existencia de un poblado y una covacha con restos de una inhumaciĂłn. El estudio de los materiales arqueolĂłgicos, que incluye cerĂĄmica, piezas metĂĄlicas o elementos de molturaciĂłn, o la dataciĂłn AMS obtenida, permiten adscribir el yacimiento a la Edad del Bronce y ampliar el conocimiento de esta etapa en la AxarquĂa oriental (MĂĄlaga, AndalucĂa).In this work we present a new site recently discovered in the Frigiliana municipality (MĂĄlaga). The spatial delimitation of the so called Los Poyos del Molinillo area let us define a Bronze age settlement and an inhumation burial cave. The archaeological record includes ceramic, metallic items or grinding elements, all of them belonging to the Bronze Age, as well as an AMS Radiocarbon data. This site extends the knowledge about this period in the Eastern AxarquĂa (MĂĄlaga, AndalucĂa)
Riesgo de subsidencia kĂĄrstica en ĂĄreas urbanas: el caso de Zaragoza
Parte del monogrĂĄfico "Riesgos geolĂłgicos externos".[EN] This paper deals with the problems generated by karst in gypsum around Zaragoza, the development of alluvial sinkholes and the concomitant risks. Sinkhole geometry depends on the mechanical behaviour of the cover overlying the evaporitic bedrock: non-cohesive soils favour the development of basin and funnel shaped dolines, whereas cohesive covers lead to the development of well-shaped collapses. Surface survey in areas prone to develop dolines is based on aerial photographs, in situ features (such as topographic depressions, stepped ground, anomalous man-made fills, wet-ground vegetation), and location of building pathologies in urban areas. In some cases, the structure and geometry of dolines can be studied in section (road cuts, for instance), where the features of natural fills allow to characterize the evolutionary patterns and sedimentation- subsidence interactions. Through dating of such fills the rate of subsidence can be estimated, and linked to possible episodes of climate variations. Doline evolution through time, either by comparison of aerial photographs taken in different years or by instrumental survey, yields the scenario of a dynamic process with subsidence rates up to 12 cm/year, where cycles of steady subsidence periods and sudden collapse are identified. In the Zaragoza area, the consequences of karst subsidence are outstanding. They dramatically increased from the 70âs, when large portions of the territory, formerly of agricultural use, turned into urban, industrial and service uses. Prevention and hazard management of karstic risks on urban and peri-urban areas must include: 1) early detection of the problem, in surface as well as underground (by means of geophysical surveys), and 2) adaptation of land use to the degree of affection by karst and the potential susceptibility. Geology, geotechnics and engineering have specific roles on risk management strategies by diminishing either the exposition to karst hazard or the vulnerability of man made structures.[ES] Este trabajo analiza, desde mĂșltiples puntos de vista, la problemĂĄtica del karst en yesos en el entorno de Zaragoza, el desarrollo de dolinas aluviales y los riesgos que Ă©stas conllevan. La morfologĂa de las dolinas depende del comportamiento mecĂĄnico de la cobertera situada sobre el sustrato yesĂfero: en coberteras sin cohesiĂłn aparecen morfologĂas en embudo y en cubeta, producidas por subsidencia continuada, mientras en coberteras con cohesiĂłn se producen dolinas en ventana provocadas por colapso brusco. El reconocimiento superficial de las dolinas se basa en la observaciĂłn de fotografĂas aĂ©reas, en el anĂĄlisis visual del terreno (depresiones topogrĂĄficas, escalones, ĂĄreas de vegetaciĂłn o rellenos antrĂłpicos anĂłmalos) y en la observaciĂłn y anĂĄlisis de daños en ĂĄreas urbanizadas. TambiĂ©n pueden estudiarse la geometrĂa y la estructura interna de las dolinas en secciones del terreno donde Ă©stas hayan quedado expuestas. AsĂ, las caracterĂsticas de sus rellenos naturales permiten conocer las pautas y tasas de evoluciĂłn y las interacciones entre la subsidencia kĂĄrstica y los procesos sedimentarios. El estudio de la evoluciĂłn temporal de las dolinas, a partir de la comparaciĂłn de fotografĂas aĂ©reas de distintos años o del seguimiento instrumental de las mismas, ha permitido reconocer que se trata de un proceso dinĂĄmico que llega a alcanzar velocidades de hundimiento de 12 cm/año. En dicha evoluciĂłn es frecuente la ocurrencia cĂclica de periodos de subsidencia lenta y eventos de hundimiento brusco. La afecciĂłn causada por la subsidencia kĂĄrstica en Zaragoza es muy significativa. Ăsta se incrementĂł a partir de los años 70 del siglo pasado, cuando buena parte del suelo agrĂcola que circundaba la ciudad fue destinado a uso urbano, industrial y grandes infraestructuras. La prevenciĂłn y manejo del riesgo kĂĄrstico en ĂĄreas urbanas y peri-urbanas debe contemplar: (1) la detecciĂłn precoz de los fenĂłmenos tanto en superficie como en profundidad (a partir de estudios geofĂsicos), y (2) la adaptaciĂłn del uso del suelo a su grado de afecciĂłn por fenĂłmenos kĂĄrsticos y a su susceptibilidad potencial a los mismos. La geologĂa, la geotecnia y la ingenierĂa desempeñan, cada una, un papel especĂfico en la estrategia para reducir el riesgo, bien sea evitando la exposiciĂłn al peligro o disminuyendo la vulnerabilidad de las construcciones.Peer reviewe
Characterization of a medium size Xe/TMA TPC instrumented with microbulk Micromegas, using low-energy gamma-rays
NEXT-MM is a general-purpose high pressure (10 bar, ~ 25 l active volume) Xenon-based TPC, read out in charge mode with an 0.8 cm Ă 0.8 cm-segmented 700 cm2 plane (1152 ch) of the latest microbulk-Micromegas technology. It has been recently commissioned at University of Zaragoza as part of the R&D of the NEXT 0ÎœÎČÎČ experiment, although the experiment's first stage is currently being built based on a SiPM/PMT-readout concept relying on electroluminescence. Around 2 million events were collected during the last months, stemming from the low energy Îł-rays emitted by a 241Am source when interacting with the Xenon gas (EÎł = 26, 30, 59.5 keV). The localized nature of such events around atmospheric pressure, the long drift times, as well as the possibility to determine their production time from the associated α particle in coincidence, allow the extraction of primordial properties of the TPC filling gas, namely the drift velocity, diffusion and attachment coefficients. In this work we focus on the little explored combination of Xe and trimethylamine (TMA) for which, in particular, such properties are largely unknown. This gas mixture offers potential advantages over pure Xenon when aimed at Rare Event Searches, mainly due to its Penning characteristics, wave-length shifting properties and reduced diffusion, and it is being actively investigated by our collaboration. The chamber is currently operated at 2.7 bar, as an intermediate step towards the envisaged 10 bar. We report here its performance as well as a first implementation of the calibration procedures that have allowed the extension of the previously reported energy resolution to the whole readout plane (10.6% FWHM@30 keV)
A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)
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The Mesolithic-Neolithic transition in southern Iberia
New data and a review of historiographic information from Neolithic sites of the Malaga and Algarve coasts (southern Iberian Peninsula) and from the Maghreb (North Africa) reveal the existence of a Neolithic settlement at least from 7.5 cal ka BP. The agricultural and pastoralist food producing economy of that population rapidly replaced the coastal economies of the Mesolithic populations. The timing of this population and economic turnover coincided with major changes in the continental and marine ecosystems, including upwelling intensity, sea-level changes and increased aridity in the Sahara and along the Iberian coast. These changes likely impacted the subsistence strategies of the Mesolithic populations along the Iberian seascapes and resulted in abandonments manifested as sedimentary hiatuses in some areas during the Mesolithic-Neolithic transition. The rapid expansion and area of dispersal of the early Neolithic traits suggest the use of marine technology. Different evidences for a Maghrebian origin for the first colonists have been summarized. The recognition of an early North-African Neolithic influence in Southern Iberia and the Maghreb is vital for understanding the appearance and development of the Neolithic in Western Europe. Our review suggests links between climate change, resource allocation, and population turnover. (C) 2011 University of Washington. Published by Elsevier Inc. All rights reserved.Fundacao para a Ciencia e a Tecnologia (Portugal); European Science Foundation [PTDC/HAH/64548/2006]; European Union; Fundacao para a Ciencia e Tecnologia; Ministerio de Ciencia e Innovacion, Spain [HAR 2008-1920, CGL2009-07603, CTM2009-07715, CSD2006-00041, HAR2008-06477-C03-03/HIST]; European Research Council [2008-AdG 230561]; MARM [200800050084447]; Project RNM [05212]; Junta de Andalucia, Spain [0179]; FCT [SFRH/BPD/26525/2006]; CSIC "JAE-Doc"info:eu-repo/semantics/publishedVersio
Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic
This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic
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Dietary αâLinolenic Acid, Marine Ïâ3 Fatty Acids, and Mortality in a Population With High Fish Consumption: Findings From the PREvenciĂłn con DIeta MEDiterrĂĄnea (PREDIMED) Study
Background: Epidemiological evidence suggests a cardioprotective role of αâlinolenic acid (ALA), a plantâderived Ïâ3 fatty acid. It is unclear whether ALA is beneficial in a background of high marine Ïâ3 fatty acids (longâchain nâ3 polyunsaturated fatty acids) intake. In persons at high cardiovascular risk from Spain, a country in which fish consumption is customarily high, we investigated whether meeting the International Society for the Study of Fatty Acids and Lipids recommendation for dietary ALA (0.7% of total energy) at baseline was related to allâcause and cardiovascular disease mortality. We also examined the effect of meeting the society's recommendation for longâchain nâ3 polyunsaturated fatty acids (â„500 mg/day). Methods and Results: We longitudinally evaluated 7202 participants in the PREvenciĂłn con DIeta MEDiterrĂĄnea (PREDIMED) trial. Multivariableâadjusted Cox regression models were fitted to estimate hazard ratios. ALA intake correlated to walnut consumption (r=0.94). During a 5.9ây followâup, 431 deaths occurred (104 cardiovascular disease, 55 coronary heart disease, 32 sudden cardiac death, 25 stroke). The hazard ratios for meeting ALA recommendation (n=1615, 22.4%) were 0.72 (95% CI 0.56â0.92) for allâcause mortality and 0.95 (95% CI 0.58â1.57) for fatal cardiovascular disease. The hazard ratios for meeting the recommendation for longâchain nâ3 polyunsaturated fatty acids (n=5452, 75.7%) were 0.84 (95% CI 0.67â1.05) for allâcause mortality, 0.61 (95% CI 0.39â0.96) for fatal cardiovascular disease, 0.54 (95% CI 0.29â0.99) for fatal coronary heart disease, and 0.49 (95% CI 0.22â1.01) for sudden cardiac death. The highest reduction in allâcause mortality occurred in participants meeting both recommendations (hazard ratio 0.63 [95% CI 0.45â0.87]). Conclusions: In participants without prior cardiovascular disease and high fish consumption, dietary ALA, supplied mainly by walnuts and olive oil, relates inversely to allâcause mortality, whereas protection from cardiac mortality is limited to fishâderived longâchain nâ3 polyunsaturated fatty acids. Clinical Trial Registration URL: http://www.Controlled-trials.com/. Unique identifier: ISRCTN35739639
The Neogene compressional stress field in the NE Iberian Peninsula
The Neogene stress field in the northeastern Iberian Peninsula is reconstructed from the analysis of brittle mesostructures (stylolytes, tension gashes, fault populations and joints). Compression directions obtained show three maxima: N-S to NNE, NW-SE and NE-SW. Stress trajectories can be interpreted according to two hypothesis: 1) An only primary stress field, with deflections due to the movement of large faults; however, some of the deflected trajectories and swapping of stress axes are anomalous and cannot be explained by classical models. 2) Two primary stress fields resulting from succesive convergence in the northern and southern margins of the Iberian plate. The N-S to NNE, «Pyrenean», compression is deflected in the Iberian Chain to NE and E-W directions. The NNW stress field, transmitted from the southern margin of the plate is more homogeneous. Both stress fields, NNE and NNW would alternate, or superimpose during the Neogene: regional deformation in the Iberian Chain agrees with a NNW compression late with respect to the Pyrenean NNE shortenin
A vision-based system for on-board identification and estimation of discarded bio-mass: A tool for contributing to marine resources sustainability
In marine harvesting, fish waste due to the discards of non-targeted species represent a risk for the sustainability of fisheries, a loss of potentially valuable living resources and a threat for the ecological equilibrium. The project FAROS aims to develop and implement an efficient, integral management network for discards, to reduce global impact of this established practice, while putting in value and optimising the use of the by-catch. The development of an on-ship automated system for discards evaluation and species biomass estimation is proposed in this contribution. The Biomass Estimation Optical System (BEOS) integrates machine vision technologies and optical information processing and feature extraction by means of nonlinear modeling based on artificial neural networks. A first functional prototype and a methodology for system implementation and operation are presented here.LIFE+ Program of the European Union (FAROS Project â LIFE08 ENV/E/000119).Peer reviewe
A vision-based system for on-board identification and estimation of discarded bio-mass: A tool for contributing to marine resources sustainability
In marine harvesting, fish waste due to the discards of non-targeted species represent a risk for the sustainability of fisheries, a loss of potentially valuable living resources and a threat for the ecological equilibrium. The project FAROS aims to develop and implement an efficient, integral management network for discards, to reduce global impact of this established practice, while putting in value and optimising the use of the by-catch. The development of an on-ship automated system for discards evaluation and species biomass estimation is proposed in this contribution. The Biomass Estimation Optical System (BEOS) integrates machine vision technologies and optical information processing and feature extraction by means of nonlinear modeling based on artificial neural networks. A first functional prototype and a methodology for system implementation and operation are presented here.LIFE+ Program of the European Union (FAROS Project â LIFE08 ENV/E/000119).Peer reviewe