1,721,055 research outputs found
Podcast Un monde vivant, histoires de biodiversité
No full textA l'occasion de l'année de la biodiversité en 2010, le CNRS a réalisé une série de 19 films de 3 minutes en moyenne pour découvrir en images 4 grandes notions de la biodiversité : la définition, la valeur, l’extinction et la conservation. Les voix de Virginie Marris, Devictor Vincent, Gildas Merceron ou de Jean-Michel Salles mettent en perspective ces différents points de vue sur la biodiversité ou encore questionnent le rapport de l'homme à la "nature". A voir et à revoir..
Archives dentaires et habitudes alimentaires dans l'Ancien : apports des approches expérimentales
No full textContrat doctoral ayant pour sujet l'enregistrement du régime alimentaire chez des porcs nourris en contexte expérimental, avec des applications aux faunes africaines du Plio-Pléistocène. Laboratoire d’accueil : Palevoprim, CNRS-INEE & Université de Poitiers. Co-direction : Gildas Merceron et Antoine Souron. Date limite de candidature : 30 avril 2019. Plus d'information sur Projet Diet-Scratches et Palevoprim lab. Description du sujet de thèse Le sujet de thèse a pour objectifs d'étudier..
Podcast Un monde vivant, histoires de biodiversité
No full textA l'occasion de l'année de la biodiversité en 2010, le CNRS a réalisé une série de 19 films de 3 minutes en moyenne pour découvrir en images 4 grandes notions de la biodiversité : la définition, la valeur, l’extinction et la conservation. Les voix de Virginie Marris, Devictor Vincent, Gildas Merceron ou de Jean-Michel Salles mettent en perspective ces différents points de vue sur la biodiversité ou encore questionnent le rapport de l'homme à la "nature". A voir et à revoir..
Evolution: an international research seminar in eastern Africa
No full textSÉMINAIRE / SEMINAR Evolution: an international research seminar in eastern Africa. Paleobiodiversity, paleobiology, prehistory, paleoenvironments (2015-2016) 1ère séance / 1st session: The extinction of great apes in Eurasia: environmental context revealed by ungulate teeth, par/by Gildas MERCERON Jeudi 12 novembre 2015 (16-17h30) / Thursday November 12th 2015 (4:00 PM-5:30 PM). Lieu / Venue: Auditorium of the National Museum of Ethiopia Organisation: CFEE & Authority for Research and Cons..
Feeding ecology of Eucladoceros ctenoides as a proxy to track regional environmental variations in Europe during the early Pleistocene
Full text linkThe early Pleistocene is represented by a succession of glacial-interglacial cycles character-ized by a general tendency towards global cooling, with increasing aridity and seasonality.The large deer Eucladoceros is found in abundance in Europe during this period of faunaldispersions. The dietary plasticity of Eucladoceros and how it can mirror early Pleistoceneclimatic variations will be explored here using Dental Microwear Texture Analysis. Thewide range of dental microwear textures for Eucladoceros reflects a low selectivity and highplasticity in its diet. It is an appropriate proxy to track vegetal resource availability. Oscil-lations were identified between a browsing and a grazing signal. This study proposes thata browsing signal is associated with a fossil assemblage deposited during an interglacialevent characterized by warmer temperatures and deciduous vegetation. A grazing signalmore likely indicates a glacial event with cooler temperatures and a developed herbaceous,bushy layer.Le Pléistocène inférieur correspond à une succession de cycles glaciaires-interglaciairescaractérisée par une tendance générale au refroidissement global, avec une aridité et unesaisonnalité croissantes. Le cervidé de grande taille Eucladoceros est abondant en Europedurant cette période de dispersions fauniques. Grâce à l'analyse de texture de la micro-usuredentaire, nous explorons la plasticité alimentaire d'Eucladoceros et la manière dont celle-ci reflète les variations climatiques du Pléistocène inférieur. La large gamme de texturesde micro-usure dentaire d'Eucladoceros reflète sa faible sélectivité et sa forte plasticité ali-mentaire. De fait, il constitue un outil approprié pour aborder la disponibilité en ressources végétales dans le milieu. Nous identifions des oscillations entre un signal brouteur et unsignal paisseur. Nous proposons qu'un signal brouteur soit associé à un assemblage fossiledéposé lors d'un évènement interglaciaire caractérisé par des températures plus chaudeset une végétation décidue, tandis qu'un signal paisseur correspondrait plutôt à un évène-ment glaciaire, avec des températures plus froides et la présence d?une strate herbacée etarbustive développée.This project was supported by the “Agence nationale dela recherche” (ANR TRIDENT: grant number: ANR-13-JSV7-0008-01; PI.: Gildas Merceron)
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
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