1,720,993 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Vacuum structure and condensates in quantum chromodynamics
Get PDFKlassiek wordt de grondtoestand van een model bepaald door na te gaan of er een globaal minimum van de potentiaal bestaat. Dit minimum correspondeert met de meest stabiele toestand van het model. Het concept van een klassieke potentiaal kan uitgebreid worden tot de zogenaamde kwantum effectieve potentiaal indien het model gekwantiseerd wordt. Deze effectieve potentiaal omvat de kwantumcorrecties op de klassieke potentiaal. Kwantumcorrecties kunnen bekomen worden via een perturbatieve ontwikkeling in een koppelingsconstante g^2, i.e. via een Taylorreeks in g^2. Uiteraard zijn perturbatieve berekeningen enkel zinvol voor een voldoende kleine g^2. Elke term in de reeks wordt berekend door middel van de evaluatie van Feynmandiagrammen. Een gekend probleem bij perturbatieve berekeningen in kwantumveldentheorie is het optreden van ultraviolet divergenties. Om zinvol om te gaan met deze divergenties moet men renormalizeren, i.e. men voert tegentermen in die de optredende oneindigheden orde per orde elimineren. Men noemt een model renormalizeerbaar indien de tegentermen door een (oneindige) herdefinitie van de al aanwezige velden, bronnen, massa's, koppelingen in het oorspronkelijk model kunnen geabsorbeerd worden. Ons onderzoek heeft zich vooral gericht op zinvolle (i.e. consistent met renormalizatie) methoden om de vacuüm verwachtingswaarden van lokaal samengestelde operatoren (LCO) te berekenen, i.h.b. voor kwantum chromodynamica (QCD), de ijktheorie die de sterke (kleur)interactie beschrijft. Eén van de meest in het oog springende eigenschappen van QCD is de asymptotische vrijheid. Summier wil dit zeggen dat de sterkte van de interactie (g^2) daalt voor stijgende energie. Omgekeerd wordt g^2 groter bij lager wordende energie. Met andere woorden, perturbatietheorie kan enkel bij zeer hoge energieën een accurate beschrijving van QCD geven. Bij lagere energie zullen niet-perturbatieve effecten een rol beginnen spelen. Een voorbeeld van een niet-perturbatief effect is de dynamische generatie van een condensaat , de vacuüm verwachtingswaarde van een bepaalde operator O. Condensaten karakteriseren in zekere zin het vacuüm van de theorie die onderzocht wordt. De beschouwde operatoren zijn lokaal, omdat werken met niet-lokale operatoren verre van triviaal is, en meestal moeten samengestelde operatoren gebruikt worden omdat de elementaire basisvelden zelf niet kunnen condenseren, b.v. omdat dit de Lorentzsymmetrie zou breken. Een methode om een condensaat te berekenen bestaat dan uit het construeren van de effectieve potentiaal voor de operator die onderstelt wordt te condenseren. Deze techniek werd uitvoerig bestudeerd in dit werk
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