1,720,980 research outputs found
Rachel Gelet
No full textGelet Rachel. Rachel Gelet. In: Diplômées, n°231, 2009. Les femmes officiers dans les armées françaises. pp. 262-263
Rachel Gelet
No full textGelet Rachel. Rachel Gelet. In: Diplômées, n°234, 2010. Echos des recherches en cours. pp. 137-138
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
Thermo-hydro-mechanical study of deformable porous media with double porosity in local thermal non-equilibrium
Get PDFA fully coupled constitutive model is presented for a rigorous analysis of deformation, hydraulic and heat flows in saturated dual porosity media subject to thermo-hydro-mechanical loadings including those able to cause local thermal non-equilibrium. The solid phase is assumed to contain two distinct cavities: the porous blocks and the fissure network. The governing equations are derived based on the equations of conservation of mass, momentum and energy. Solution to the governing equations is obtained numerically using the finite element approach. The capabilities of the model address two energy applications: the stability of a borehole in a thermally enhanced oil recovery context and the heat extraction of enhanced geothermal systems. Substantial differences, particularly in the effective stress response, highlight the major influence of the dual porosity model and the importance of the local thermal non-equilibrium assumption to predict the behaviour of fractured media
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
Modélisation numérique poro-élastique de l'érosion interne : développement d'une approche énergétique
No full textLa majeure partie des instabilités observées sur les ouvrages hydrauliques en terre est due aux mécanismes d’érosion interne. Parmi ces mécanismes, la suffusion est un processus volumique qui combine le détachement, le transport et l’éventuelle filtration d’une partie des grains transportés. Dans la littérature, la cinétique de ce processus a été peu étudiée, contrairement à son initiation. Ce travail de thèse a pour objectif d’étudier le développement de la suffusion pour lequel une nouvelle loi de comportement est proposée à partir de l’approche énergétique. Cette loi utilise deux paramètres qui caractérisent la fin du processus de suffusion et un paramètre qui gouverne la vitesse de son développement. Cette loi est validée grâce à des essais expérimentaux existants et est comparée à deux autres lois issues de la littérature. Les principaux avantages de la loi basée sur l’énergie sont de limiter la masse érodée cumulée à une valeur maximale et d’utiliser des paramètres mesurables expérimentalement. Pour modéliser ce phénomène, un modèle thermoporo- élastique est développé dans le cadre de la théorie des mixtures. Le sol saturé et érodable est représenté par un mélange à deux phases et quatre espèces. La solution aux équations de champs est obtenue numériquement par la méthode des éléments finis. Les capacités du modèle sont présentées à l’échelle de l’échantillon et à l’échelle d’un modèle physique de digue. La simulation numérique de ce modèle physique montre des résultats prometteurs, en particulier pour l’ordre de grandeur de la masse érodée cumulée ainsi que la distribution spatiale des particules fines. Cette étude ouvre d’intéressantes perspectives de recherche sur la simulation d’ouvrages à partir de paramètres mesurés en laboratoire.Internal erosion processes are responsible for the majority of instabilities within hydraulic earth structures. Among these processes, suffusion is the volumetric process gathering detachment, transport and possibly filtration of some transported particles. In literature, the suffusion kinetics has been little tackled, unlike its initiation. This study deals with suffusion kinetics for which a new relationship inspired from the energy approach is proposed. This relationship uses two parameters that characterize the end of the suffusion process and one parameter that governs its development. This relationship is validated against existing experimental results and is compared with two other relationships inspired from the literature. The main advantages of the energy-based law are to limit the cumulative eroded mass with a cap value and to use experimentally measurable parameters. To model this phenomenon, a thermo-poro-elastic model is developed within the mixture theory framework. The saturated erodible soil is represented by a two-phase four-species mixture. Solution to the governing equations is obtained numerically using the finite element approach. Finally, the capabilities of the model are presented at both the sample scale and the scale of a physical model of dike. The numerical simulation of the dike model shows promising results, particularly for the magnitude of the cumulative eroded mass and the spatial distribution of fine particles. This study opens the way to further research opportunities concerning the simulation of earth structures based on laboratory measured parameters
- …
