Bronze Age ceramics in southwest Spain: An exploratory archaeometric study of technology and function     

Angel Polvorinos del Río  Leonardo García Sanjun  Víctor Hurtado Prez  M. Jesús Hernndez Arnedo 《Geoarchaeology》2005,20(3):263-284

Pottery from the Bronze Age of southwest Spain has traditionally been approached from a “typological” stand seeking the establishment of chronological sequences. This article examines ceramics from two different Bronze Age sites, a settlement (El Trastejón) and a necropolis (La Traviesa), from an archaeometric viewpoint. The methodology involved includes mineralogical characterization by XRD and optical microscopy, chemical analysis by XRF, and morphometric analysis through digital processing of thin sections. The analytical results are contextualized within the general framework of our current archaeological knowledge of both sites and their general background, and then a preliminary interpretation is proposed in terms of the prehistoric technology of pottery manufacture and functionality. © 2005 Wiley Periodicals, Inc.  相似文献   

Changes in the storage and sink of carbon dioxide in subsurface atmospheres controlled by climate-driven processes: the case of the Ojo Guareña karst system     

Angel Fernandez-Cortes  Soledad Cuezva  Elena Garcia-Anton  Miriam Alvarez-Gallego  Concepcion Pla  David Benavente  Juan Carlos Cañaveras  Jose Maria Calaforra  David Paterson Mattey  Sergio Sanchez-Moral 《Environmental Earth Sciences》2015,74(12):7715-7730

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Short-range forecast of heavy precipitation and strong wind using the convection-allowing WRF models     

N. F. Vel’tishchev  V. D. Zhupanov  Yu. B. Pavlyukov 《Russian Meteorology and Hydrology》2011,36(1):1-10

The results are stated of estimation of short-range forecasting of heavy precipitation (P ≥ 10 mm/12 hours) and strong wind at the height of 10 m (V ≥ 10 m/s) using three nonhydrostatic models from the WRF family: ARW, ARW Glob, and NMM. The forecasts on the basis of all three models were carried out using two grids. The horizontal resolution of external grids varied from 9 to 16.5 km and that of the nested grids, from 3 to 5.5 km. For the ARW and NMM models, the values at side boundaries of external nested grids were taken from the forecasts on the basis of the global GFS NCEP model and for the ARW Glob model, from the global forecasts based on this model. The convection parameterization was turned off at nested grids for all models. The forecasts of heavy precipitation and strong wind at nested grids over the European territory of Russia were estimated from the radar and station measurements in summer 2008. It is obtained that all three models reproduce well enough the mesoscale convective systems and associated areas of heavy precipitation and strong wind but they have common shortcomings: they overestimate the amount and area of heavy precipitation and underestimate the strong wind speed. To a lesser degree, these shortcomings are typical of the ARW model. The possible reasons for systematic errors in the forecasts are discussed.  相似文献   

Implementation of the European Marine Strategy Framework Directive: a methodological approach for the assessment of environmental status, from the Basque Country (Bay of Biscay)     

Borja A  Galparsoro I  Irigoien X  Iriondo A  Menchaca I  Muxika I  Pascual M  Quincoces I  Revilla M  Germán Rodríguez J  Santurtún M  Solaun O  Uriarte A  Valencia V  Zorita I 《Marine pollution bulletin》2011,62(5):889-904

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Validation of Arenicola marina in field toxicity bioassays using benthic cages: biomarkers as tools for assessing sediment quality     

Ramos-Gómez J  Martins M  Raimundo J  Vale C  Martín-Díaz ML  DelValls TA 《Marine pollution bulletin》2011,62(7):1538-1549

Sediment toxicity assessments using caged organisms present advantages over using laboratory and native community studies. The use of caged Arenicola marina in sediment toxicity assessments was evaluated. Lugworms were exposed in situ to sediments from coastal and port areas in Spain for seven days, and the activities of the biotransformation enzymes ethoxyresorufin O-deethylase, dibenzylfluorescein dealkylase and glutathione S-transferase, the activities of the antioxidant enzymes glutathione reductase and glutathione peroxidase and lipid peroxidation were then analyzed as biomarkers. Biomarker results and sediment physicochemical data were integrated. Cádiz Bay (SW Spain) sediments presented metal contamination that was not linked to a biochemical response. In LPGC Port (SW Spain), Pb contamination exhibited a moderate toxic potential, while PAHs, and presumably pharmaceuticals, provoked biochemical responses that efficiently prevented lipid peroxidation. In Santander Bay (N Spain), exposure to PAHs and, presumably, pharmaceuticals induced biomarker responses, but lipid peroxidation occurred nevertheless. These results indicated that caged A. marina were effective for the assessment of sediment quality and that the selected biomarkers were sufficiently sensitive to identify chemical exposure and toxicity.  相似文献   

Open your minds: technological development and job opportunities from marine environmental legislation     

Borja A 《Marine pollution bulletin》2011,62(1):1-2

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Overview of eutrophication indicators to assess environmental status within the European Marine Strategy Framework Directive   总被引：1，自引：0，他引：1  

João G. Ferreira  Jesper H. Andersen  Angel Borja  Suzanne B. Bricker  Jordi Camp  Margarida Cardoso da Silva  Esther Garcés  Anna-Stiina Heiskanen  Christoph Humborg  Lydia Ignatiades  Christiane Lancelot  Alain Menesguen  Paul Tett  Nicolas Hoepffner  Ulrich Claussen 《Estuarine, Coastal and Shelf Science》2011

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Erratum: Hydromagnetic stability of a slim disc in a stationary geometry     

Rafael Angel Araya-Góchez 《Monthly notices of the Royal Astronomical Society》2003,339(3):912-912

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Searching for planets by differential astrometry with large telescopes     

Richard Dekany  Roger Angel  Keith Hege  Dave Wittman 《Astrophysics and Space Science》1994,212(1-2):299-319

Traditional astrometric methods are limited in accuracy by the atmosphere in a way that does not show much improvement with increased telescope aperture. However, there is the potential for very high accuracy with large telescopes if advantage can be taken of these factors: First, the differential atmospheric distortion of images of closely adjacent stars is less with larger aperture; second, the diffraction limit is sharper, and third, photon statistics are improved. In this paper we analyze and give experimental tests of techniques that could be applied to the detection of planets with the mass of Jupiter or Uranus, if they are present in nearby binary star systems.The atmospheric perturbation of the relative position of the energy centroids measured in short exposure images of binary stars depends on the effective height of the turbulent distortion. For a 4-meter telescope, the error in centroid determination of a 4-arcsec binary can be as small as 20 milliarcsec (mas) in a single 20-millisecond (msec) exposure. The relative position measured by cross-correlation of short exposure speckle images, as suggested by McAlister (1977b), may give even higher accuracy. In this case, Roddier (Roddieret al., 1980) has shown that the atmospheric error depends on the thickness rather than the height of the layers that make the dominant contribution to the turbulence. Through Monte Carlo analysis we show that on occasions when the turbulence arises largely in a thin layer, a single 20-msec exposure of a 4-arcsec binary taken with a 4-m aperture can yield an astrometric accuracy of order 0.5 mas.We report on experiments made at the Steward Observatory 2.3-m telescope which achieved accuracies corresponding to 1.7 mas in a 2.24-arcsec binary and 16.1 mas in a 6.0-arcsec binary with only 15 and 18 specklegram pairs respectively. We plan to use the 6.5-m converted MMT to obtain much higher performance, between 4.0 mas and 0.40 masper independent specklegram pair, depending upon atmospheric conditions, for binaries of 4-arcsec separation. By cycling rapidly through perhaps 100 binaries, thus calibrating systematic errors through the average change in binary separation, Jupiter-mass planets may be detectable with small but regular access to the telescope.Paper presented at the Conference onPlanetary Systems: Formation, Evolution, and Detection held 7–10 December, 1992 at CalTech, Pasadena, California, U.S.A.  相似文献   

Local people unprotected by protected (depopulated) natural areas: the case of Sierra Norte Guadalajara,Spain     

Angel Paniagua 《GeoJournal》2018,83(5):993-1004

The aim of this study is to place the current geographical debate on nature in the context of protected natural areas severely affected by depopulation processes, in which the daily lives of the inhabitants have been altered by changes in the traditional balance between human and non-human populations. A significantly humanized area within the Sierra Norte de Guadalajara National Park in central Spain is considered as an example. The qualitative methodology followed is based on documentary analysis and interviews with key inhabitants in the area, revealing narratives with a productive or consumer view of the nature. The national park appears as a container of a cultural nature, initially created by the traditional inhabitants, which generates an artificial, excessive nature and accelerates regressive sociodemographic dynamics.  相似文献