1,721,018 research outputs found
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
X-ray analysis of the accreting supermassive black hole in the radio galaxy PKS 2251+11
Full text linkWe investigate the dichotomy between jetted and non-jetted Active Galactic
Nuclei (AGNs), focusing on the fundamental differences of these two classes in
the accretion physics onto the central supermassive black hole (SMBH). Our aim
is to study and constrain the structure, kinematics and physical state of the
nuclear environment in the Broad Line Radio Galaxy (BLRG) PKS 2251+11. The high
X-ray luminosity and the relative proximity make such AGN an ideal candidate
for a detailed analysis of the accretion regions in radio galaxies. We
performed a spectral and timing analysis of a 64 ks observation of PKS
2251+11 in the X-ray band with XMM-Newton. We modeled the spectrum considering
an absorbed power law superimposed to a reflection component. We performed a
time-resolved spectral analysis to search for variability of the X-ray flux and
of the individual spectral components. We found that the power law has a photon
index , absorbed by an ionized partial covering medium with
a column density cm, a ionization
parameter erg s cm and a covering factor
. Considering a density of the absorber typical of the Broad Line
Region (BLR), its distance from the central SMBH is of the order of
pc. An Fe K emission line is found at 6.4 keV, whose intensity shows
variability on time scales of hours. We derived that the reflecting material is
located at a distance , where is the Schwarzschild
radius. Concerning the X-ray properties, we found that PKS 2251+11 does not
differ significantly from the non-jetted AGNs, confirming the validity of the
unified model in describing the inner regions around the central SMBH, but the
lack of information regarding the state of the very innermost disk and SMBH
spin still leave unconstrained the origin of the jet
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
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
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