1,721,228 research outputs found
LAFARA: a new underground laboratory in the French Pyrenees for ultra low-level gamma-ray spectrometry
No full textISI Document Delivery No.: 090UN Times Cited: 0 Cited Reference Count: 42 Cited References: Arnold D, 2002, APPL RADIAT ISOTOPES, V56, P405, DOI 10.1016/S0969-8043(01)00222-6 Arpesella C, 1996, APPL RADIAT ISOTOPES, V47, P991, DOI 10.1016/S0969-8043(96)00097-8 Avignone FT, 2005, NEW J PHYS, V7, DOI 10.1088/1367-2630/7/1/006 Berelson WM, 1997, DEEP-SEA RES PT II, V44, P2251, DOI 10.1016/S0967-0645(97)00030-1 Blain S, 2007, NATURE, V446, P1070, DOI 10.1038/nature05700 Bourquin M, 2011, MAR CHEM, V126, P132, DOI 10.1016/j.marchem.2011.05.001 Bourquin M, 2008, MAR CHEM, V109, P226, DOI 10.1016/j.marchem.2008.01.002 Busto J, 2002, NUCL INSTRUM METH A, V492, P35, DOI 10.1016/S0168-9002(02)01280-9 DEHAIRS F, 1980, EARTH PLANET SC LETT, V49, P528, DOI 10.1016/0012-821X(80)90094-1 Dezileau L, 2003, MAR CHEM, V81, P105, DOI 10.1016/S0304-4203(02)00070-1 Evrard O, 2012, J ENVIRON RADIOACTIV, V114, P54, DOI 10.1016/j.jenvrad.2012.01.024 FRANCOIS R, 1993, PALEOCEANOGRAPHY, V8, P611, DOI 10.1029/93PA00784 HEUSSER G, 1995, ANNU REV NUCL PART S, V45, P543, DOI 10.1146/annurev.nucl.45.1.543 Hult M, 2004, APPL RADIAT ISOTOPES, V61, P173, DOI 10.1016/j.apradiso.2004.03.040 Hult M, 2000, APPL RADIAT ISOTOPES, V53, P225, DOI 10.1016/S0969-8043(00)00138-X Kohler M, 2009, APPL RADIAT ISOTOPES, V67, P736, DOI 10.1016/j.apradiso.2009.01.027 KUMAR N, 1993, NATURE, V362, P45, DOI 10.1038/362045a0 Laubenstein M, 2004, APPL RADIAT ISOTOPES, V61, P167, DOI 10.1016/j.apradiso.2004.03.039 Legeleux F, 1996, DEEP-SEA RES PT I, V43, P1857, DOI 10.1016/S0967-0637(96)00086-6 Loaiza P, 2011, NUCL INSTRUM METH A, V634, P64, DOI 10.1016/j.nima.2011.01.017 Maneschg W, 2008, NUCL INSTRUM METH A, V593, P448, DOI 10.1016/j.nima.2008.05.036 MANGINI A, 1977, EARTH PLANET SC LETT, V37, P251, DOI 10.1016/0012-821X(77)90170-4 Margineanu R, 2008, APPL RADIAT ISOTOPES, V66, P1501, DOI 10.1016/j.apradiso.2008.04.002 McManus JF, 2004, NATURE, V428, P834, DOI 10.1038/nature02494 MOORE WS, 1991, EARTH PLANET SC LETT, V107, P55, DOI 10.1016/0012-821X(91)90043-H Negre C., 2011, NATURE, V468, P84 Neumaier S, 2000, APPL RADIAT ISOTOPES, V53, P173, DOI 10.1016/S0969-8043(00)00129-9 Niese S, 1998, J RADIOANAL NUCL CH, V233, P167, DOI 10.1007/BF02389666 Paytan A, 1996, GEOCHIM COSMOCHIM AC, V60, P4313, DOI 10.1016/S0016-7037(96)00267-0 Povinec PP, 2004, APPL RADIAT ISOTOPES, V61, P85, DOI 10.1016/j.apradiso.2004.03.019 REYSS JL, 1995, NUCL INSTRUM METH A, V357, P391, DOI 10.1016/0168-9002(95)00021-6 VANDERLOEFF MMR, 1993, DEEP-SEA RES PT I, V40, P339 Schwaiger M, 2002, APPL RADIAT ISOTOPES, V56, P375, DOI 10.1016/S0969-8043(01)00217-2 Stephens MP, 1997, PALEOCEANOGRAPHY, V12, P797, DOI 10.1029/97PA02271 van Beek P, 2007, GEOCHIM COSMOCHIM AC, V71, P71, DOI 10.1016/j.gca.2006.07.041 van Beek P, 2010, J ENVIRON RADIOACTIV, V101, P521, DOI 10.1016/j.jenvrad.2009.12.002 van Beek P, 2004, DEEP-SEA RES PT I, V51, P235, DOI 10.1016/j.dsr.2003.10.007 van Beek P, 2009, GEOCHIM COSMOCHIM AC, V73, P4720, DOI 10.1016/j.gca.2009.05.063 van Beek P, 2002, GEOLOGY, V30, P731, DOI 10.1130/0091-7613(2002)0302.0.CO;2 van Beek P, 2008, DEEP-SEA RES PT II, V55, P622, DOI 10.1016/j.dsr2.2007.12.025 van Beek P, 2001, EARTH PLANET SC LETT, V187, P147, DOI 10.1016/S0012-821X(01)00288-6 Yu EF, 1996, NATURE, V379, P689, DOI 10.1038/379689a0 van Beek, P. Souhaut, M. Lansard, B. Bourquin, M. Reyss, J-L. von Ballmoos, P. Jean, P. FEDER funds (Fonds Europeen de Developpement Regional); University Paul Sabatier (Toulouse); ANR SOLWARA We are grateful to EDF (Electricite De France) for allowing us to run our germanium detectors in the tunnel of Ferrieres (Ariege, French Pyrenees). The well-type germanium detector and its equipment were jointly founded by OMP (Observatoire Midi-Pyrenees), the University Paul Sabatier, LEGOS (Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales), IRD (Institut de Recherche et de Developpement). The semi-planar germanium detector (ORTEC/AMETEK (R)) and its equipment were jointly funded by FEDER funds (Fonds Europeen de Developpement Regional), the University Paul Sabatier (Toulouse) and ANR SOLWARA. We thank Pascal Gisquet (GET, OMP) who helped us to reduce the background of the semi-planar germanium detector. We thank Eric Viollier and Bruno Bomb led who provided the sediment sample separated from the core collected at station A3 on the Kerguelen Plateau on board RV Marion Dufresne (KEOPS project; PI: Stephane Blain; chief scientist : Bernard Queguiner). We thank Lionel Scouarnec and Christophe Guillerm (INSU) for their help at sea during the deployment of the in situ pumps. We thank Catherine Organo who collected the sediment core KTB03 in the equatorial Pacific on board RV l'Atalante (FLUPAC project; chief scientist Robert Le Borgne). 0 ELSEVIER SCI LTD OXFORD J ENVIRON RADIOACTIVWe describe a new underground laboratory, namely LAFARA (for "LAboratoire de mesure des FAibles RAdioactivites"), that was recently created in the French Pyrenees. This laboratory is primarily designed to analyze environmental samples that display low radioactivity levels using gamma-ray spectrometry. Two high-purity germanium detectors were placed under 85 m of rock (ca. 215 m water equivalent) in the tunnel of Ferrieres (Ariege, France). The background is thus reduced by a factor of 20 in comparison to above-ground laboratories. Both detectors are fully equipped so that the samples can be analyzed in an automatic mode without requiring permanent presence of a technician in the laboratory. Auto-samplers (twenty positions) and systems to fill liquid nitrogen automatically provide one month of autonomy to the spectrometers. The LAFARA facility allows us to develop new applications in the field of environmental sciences based on the use of natural radionuclides present at low levels in the environment. As an illustration, we present two of these applications: i) dating of marine sediments using the decay of Ra-226 in sedimentary barite (BaSO4), ii) determination of Ac-227 (Pa-231) activities in marine sediment cores. (C) 2012 Elsevier Ltd. All rights reserved
Measuring the radium quartet (Ra-228, Ra-226, Ra-224, Ra-223) in seawater samples using gamma spectrometry
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Souhaut, M. Reyss, J. -L. 13 ELSEVIER SCI LTD OXFORD J ENVIRON RADIOACTIV SIRadium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While Ra-228 and Ra-228 are usually measured using gamma spectrometry, short-lived Ra isotopes (Ra-224 and Ra-223) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be Ra-228 Ra-224 223 analyzed using gamma spectrometry. We report Ra-226 Ra activities measured using low-background gamma spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The Ra-223 and Ra-224 activities determined in these samples using gamma spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the Ra-224 activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low Ra-223 activities. Gamma spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes. (C) 2009 Elsevier Ltd. All rights reserved
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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