1,721,304 research outputs found
Chronology of Organochlorine Pesticides (OCPs) releases and interactions with sediment characterisitcs in the Eure River, France
No full textWe reconstruct the chronology of organochlorine pesticides (OCPs) releases and study the role of sediment characteristics (e.g organic matter) in the interpretation of this chronology. For that, sediment cores MAR16-02 and MAR15-01 were collected downstream of the Eure River watershed, the main tributary of the Seine estuary (France).
The analysis of particulate OCPs in the MAR16-02 sediment core was performed using microwave-assisted extraction, with toluene:acetone mixture for extraction. Following the microwave-assisted extraction, a gas chromatograph (7890B, Agilent, US) coupled to a mass spectrometer (MS; 7000C) was used to measure the concentrations. Organic matter parameters from MAR15-01 sediment core was measured by Rock-Eval 6
L'objet emblématique Lacs de Montagne : L'étude des sédiments lacustres au laboratoire EDYTEM.
No full textArnaud Fabien, Giguet-Covex Charline, Wilhelm Bruno, Jenny Jean-Philippe, Sabatier Pierre, Poulenard Jerôme, Desmet Marc, Enters Dirk, Revillon Sidonie, Millet Laurent, Debret Maxime, Pignol Cécile, Malet Emmanuel, Fanget Bernard. L'objet emblématique Lacs de Montagne. L'étude des sédiments lacustres au laboratoire EDYTEM. In: Collection EDYTEM. Cahiers de géographie, numéro 16, 2014. Environnements, dynamiques et territoires de la montagne : Dix ans de recherches au laboratoire EDYTEM. pp. 107-118
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
Holocene climate variability from continental, marine and glacial records
No full textThe aim of this thesis is to characterize Holocene climate variability (10 000-0 years) by the analysis of marine, continental and glacial records. North and South Atlantic and southern ocean records allowed to identify two millenial frequencies. The first are present during the first part of the Holocene (10 000-5 000 years) and are comparable to frequencies observed in solar activity, whereas the second ones, during the late Holocene (5 000-10 000 years), suggest an internal oceanic forcing. This Holocene pattern depicts an oceanic circulation influenced by the melt water coming from the last continental ice sheet in North America until 5 000 years. After 5 000 years, the second part of the Holocene is marked by the gradual appearance of internal forcing, accompanied by a stabilisation of the signal linked to a less disturbed salinity content. In Antarctica, original dust data were produced for the last 2 000 years from the Vostok and Dôme C ice cores. For Holocene period, the analysis of various data (stable isotope, Deuterium excess, Dust) from different places in East Antarctica does not yield persistent and significant feature for all of this proxies. In Greenland, the only significant frequencies in the Deuterium content are the results of a huge melt water discharge events around 8 200 years. The climatic signal extracted from polar ice caps for the Holocene period is hidden by specific processes such as local effects, proxy sensitivity,...L'objectif de la thèse est de caractériser la variabilité climatique de la période Holocène (10 000-0 ans) en analysant des séries climatiques d'enregistrements marins, continentaux, glaciaires. Les enregistrements d'Atlantique Nord et Sud ainsi que l'océan Austral ont permis d'identifier deux types de fréquences millénaires : les premières s'expriment pendant le début de l'Holocène (10 000-5 000 BP) et sont similaires aux fréquences solaires, les secondes, pendant la fin de l'Holocène, suggèrent un forçage interne océanique. Ce schéma Holocène avec une circulation océanique qui s'établit à un régime stable à partir de 5 000 ans coïncide avec l'établissement du niveau marin à son niveau proche de l'actuel, en lien avec la disparition de la calotte Laurentides et les drainages d'eau douce en Atlantique Nord. À partir de 5 000 ans, les flux d'eau douce ne perturbent plus le gradient de salinité permettant l'établissement de la circulation thermohaline à son régime stable. En Antarctique, de nouvelles séries de données poussières couvrant les 2000 dernières années à Dôme C et Vostok ont été produites. Sur la période Holocène en analysant l'ensemble des données disponibles (isotopes stables, excès en Deutérium, poussières) pour différents sites sur le plateau Antarctique, il n'apparaît aucune structure persistante significative pour aucun des proxies. Au Groenland, les seules fréquences significatives dans le deutérium sont l'empreinte spectrale de l'événement 8 200 ans. Le signal climatique déduit des calottes polaires pour la période Holocène est masqué par des processus tels que les effets locaux, la sensibilité des proxy,..
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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