1,720,967 research outputs found
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
Seismic velocities, anisotropy and elastic properties of crystalline rocks and implications for interpretation of seismic data
Get PDFRÉSUMÉ: La connaissance des propriétés sismiques et élastiques des roches cristallines polyphasées à haute pression et haute température est nécessaire pour interpréter les données sismiques (profils sismiques réflexion et réfraction, fonctions télésismiques, tomographie) en termes de lithologie, de minéralogie et d'état physique ainsi que pour établir des modèles lithologiques et structuraux de la lithosphère. La présente étude vise à mieux comprendre comment les propriétés sismiques et élastiques (vitesses sismiques en compression et en cisaillement (Vp et Vs), anisotropie,paramètres élastiques) en fonction de la pression de confinement varient avec la composition minéralogique et chimique, la microstructure, l'orientation préférentielle des réseaux cristallins (‘lattice preferred orientation': LPO), et la géométrie et l'état des microfissures. Cette thèse, se compose de six chapitres. Le Chapitre 1 aborde les propriétés sismiques des roches, en se concentrant sur les concepts d'élasticité et des règles mélange, et en donnant un aperçu sur des statistiques relatives aux données sismiques pour divers types lithologiques et pour des minéraux cardinaux, et ce, en relation avec les séismes dans la croûte continentale et la partie supérieure du manteau. Le Chapitre 2 traite des propriétés sismiques et élastiques mesurées à des pressions hydrostatiques allant jusqu'à 800 MPa pour 12 échantillons représentatifs du complexe du Longmen Shan, siège du grand séisme de Wenchuan en 2008. La plupart des échantillons montrent peu d'anisotropie Vp ou Vs à des pressions supérieures à la pression de fermeture des microfissures (Pc = 200-300 MPa). La variation de l'anisotropie en fonction de la pression fournit des indications importantes sur l'orientation préférentielle des microfissures dans le régime nonlinéaire poroélastique en dessous de Pc. Les profils rhéologiques et géothermiques indiquent que la profondeur au foyer (~19 km) correspond à la base de la schizosphere, niveau en dessous duquel le complexe du Longmen Shan passe d'un comportement fragile à un comportement ductile. ABSTRACT: The knowledge of seismic and elastic properties of polyphase crystalline rocks under high pressure and temperature conditions is fundamental in interpreting in-situ seismic data (e.g., reflections, refractions, received functions, and tomography). These data may be understood in terms of lithology, mineralogy, and physical state and as such they allow establishing lithospheric structure and composition models of continents. The present study aims to better understand how the seismic and elastic properties [e.g., compressional- and shear-wave velocities (Vp and Vs), anisotropy, and elastic parameters] under confining pressure are affected by modal and chemical compositions, microstructures, lattice preferred orientations (LPO) of rocks and by the geometry and state of microcracks. This thesis consists of six chapters. Chapter 1 addresses the framework of rock seismic property studies, focusing on the concepts of elasticity and mixture rules, and providing an overview on results of statistical analysis on previous laboratory-measured seismic data of different lithologies and rock-forming minerals, and on the seismic anisotropy of the continental crust and upper mantle. Chapter 2 deals with seismic and elastic properties measured at hydrostatic pressures up to 800 MPa for 12 representative samples from the Longmen Shan complex in which the great 2008 Wenchuan earthquake took place. These allowed understanding how coseismic ruptures nucleated and propagated. Most of the samples show little Vp or Vs anisotropy at pressures above the closure-pressure of microcrack (Pc=200-300 MPa), the variation of anisotropy with pressure thus provides important hints for the preferred orientation of microcracks in the nonlinear poroelastic regime below Pc. Geothermal and rheological profiles indicate that the focal depth (~19 km) corresponds to the base of the schizosphere, below which the Longmen Shan complex switches from brittle to ductile behaviour
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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