1,721,174 research outputs found
Fingerprinting of monovarietal olive oils from Argentina and Uruguay via stable isotope, fatty acid profile, and chemometric analyses
Get PDFFil: Spangenberg, Jorge Enrique. University of Lausanne. Institute of Earth Surface Dynamics (IDYST); SuizaFil: Lantos, Irene Johanna. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad de Buenos Aires. Instituto de las Culturas; ArgentinaTracing methods of non-European EVOOs commercialized worldwide are becoming crucial for effective authenticity controls. Limited analytical studies of these oils are available on a global scale, similar to those of European EVOOs. We report for the first time the fatty acid concentrations, bulk-oil 2H/1H, 13C/12C, and 18O/16O ratios and fatty acid 13C/12C ratios of 43 authentic monovarietal EVOOs from different geographical regions in Argentina and Uruguay. The samples were obtained from a wide range of latitudes and altitudes along an E–W profile, from lowlands near the Atlantic Ocean to the pre-Andean highlands near the Pacific Ocean. Principal component scores were used to cluster EVOOs into three groups— central-western Argentina, central Argentina, and Uruguay—based on nine stable isotope ratios and the oleic-linoleic acid concentration ratio. The bulk 2H/1H and 18O/16O values and 13C/12C of palmitoleic and linoleic acids provide good tools for differentiating these oils via linear discriminant analysis.Spangenberg, J. E. y Lantos, I. J. (2024) Fingerprinting of monovarietal olive oils from Argentina and Uruguay via stable isotope, fatty acid profile, and chemometric analyses. Food Chemistry, 449, 139194
SF (Self-sealing of faults and paleo-fluid flow): Synthesis report
Get PDFCalcite, calcite-celestite and celestite veins were identifed from the bottom of the Opalinus Clay up to the Malm limestone. Most of the sampling effort for veins was focused on the NE trending Main Fault, a thrust structure related to the Jura folding and thrusting, where sub-millimeter thick calcite (±celestite) veins are common. The few accessible (no shotcrete on the gallery wall) NW trending and sub-horizontal celestite-calcite veins located below and above the Main fault were also sampled. Isotopic analyses (Sr, S, O, C) were performed on whole rock carbonate, diagenetic sulfides, evaporitic sulfates (Triassic) and vein minerals (calcite and celestite) from samples distributed along a profile from the Muschelkalk to the Malm. Isotope data suggest that veins formed during a single geotectonic event that allowed fluids to flow across the Opalinus Clay, with the main fluid source located in the underlying Trias. Petrographic data combined with structural information indicate that vein mineral precipitation was syntectonic and most likely occurred during the Jura folding and thrusting. Sulfate-rich fluids were apparently expelled upward from the Trias aquifers (probably Keuper) through active faults and mixed with local fluids
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
Continuidades y rupturas en las relaciones laborales de Argentina tras la crisis del neoliberalismo
Get PDFDurante la década del 90 se han desarrollado profundas transformaciones en las relaciones laborales que han tendido a la flexibilización de las condiciones de trabajo, cuya base fueron las políticas económicas del neo liberalismo. A partir de 2003, se desarrollan una serie de transformaciones en el mercado de trabajo, en el régimen de acumulación y en el rol del Estado que estarían trayendo cambios en los procesos de flexibilización. En este marco, el objetivo del presente artículo es establecer los cambios y continuidades en las relaciones laborales en torno a los procesos de flexibilización laboral en argentina entre los periodos 1990-2002 y 2003-2011. Para el estudio comparativo, se analizan los procesos desarrollados en el nivel “Macro”; y por medio de los contenidos de los Convenios Colectivos de Trabajo surgidos de la negociación colectiva en el sector automotriz y la distribución de energía eléctrica, aquellos vinculados al nivel “Micro”.Fil: Delfini, Marcelo Fabián. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Medina Freyer Spangenberg, Jorge Enrique. Universidad de Buenos Aires. Facultad de Cs.sociales. Carrera de Relaciones del Trabajo; ArgentinaFil: Drolas, María Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Centro de Estudios E Investigaciones Laborales; Argentin
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