1,720,968 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
Cours et Exercices
Get PDFCe polycopié s'adresse aux étudiants Licence en Génie Mécanique (Énergétique et
thermique) ou en fin de cursus dans les écoles d’ingénieurs. Il est rédigé de manière simplifiée
afin que l’étudiant puisse assimiler le contenu du cours. Des exercices sont donnés pour que
l’étudiant s’y entraine à la fin de chaque chapitre, les solutions des exercices sont regroupées
à la fin de ce polycopié. Ce polycopié est divisé en quatre chapitres suivi de quatre parties qui contiennent la
solution d’exercices. Le contenu du premier chapitre concerne généralité sur la combustion,
où les phénomènes interviennent conjointement : L’aspect chimique, l’aspect transfert de
chaleur et l’aspect mécanique. Nous avons présenté quelques notions fondamentales comme
la réaction globale de combustion, la combustion stœchiométrique, la combustion oxydante,
et la combustion réductrice.
Le deuxième chapitre présente la thermodynamique des cycles moteurs. On y rappelle
une brève histoire sur les moteurs à combustion interne. Généralités et classification des
moteurs à combustion interne, principe de fonctionnement. En fin un détaille sur les cycles
thermodynamique suivi par vingt-trois exercices d’application.
Dynamique des moteurs alternatifs générés par le système bielle-manivelle qui permet
la transformation d'un mouvement circulaire continu en mouvement rectiligne alternatif et
réciproquement mouvement rectiligne alternatif en mouvement circulaire continu, en
constituent le troisième chapitre. Des exercices sont proposés à la fin de ce chapitre.
Le quatrième chapitre présente les performances et caractéristiques des moteurs
alternatifs (pression moyenne, couple moteur, la puissance, le rendement, etc.………..). En
rappelant d’apport la notion de la suralimentation, la puissance de compression, l’utilisation
de l’énergie des gazes d’échappement et en fin la consommation spécifique. Plusieurs
exercices d’applications son proposée à la fin de ce chapitre.
On complète cette polycopié par quatre parties contiennent des solutions bien détaille
des exerces proposé, ils sont séparé par chapitre
Stability of swirling flows with heat transfer in a cylindrical enclosure with co/counter-rotating end disks under an axial magnetic field
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