1,721,131 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
The reprocessing features in the X-ray spectrum of the NELG MCG -5-23-16
Full text linkWe present results from the spectral analysis of the Seyfert 1.9
galaxy MCG –5-23-16, based on ASCA, BeppoSAX, Chandra and XMM-Newton observations.
The spectrum of this object shows a complex iron Kα emission line, which is best modeled by a superposition of a narrow and a broad (possibly relativistic)
iron line, together with a Compton reflection component. Comparing results from all (six)
available observations, we do not find any significant variation in the flux of
both line components. The moderate flux continuum variability (about 25% difference
between the brightest and faintest states), however, does not permit us to infer much about the location of the line-emitting material. The amount of Compton
reflection is lower than expected from the total iron line EW, implying either an iron
overabundance or that one of the two line components (most likely the narrow one) originates
in Compton-thin matter
XMM-Newton observation of Mrk 110
No full textContext.We report on the first XMM-Newton observation of the bright
narrow-line Seyfert 1 galaxy Mrk 110.
Aims.Our analysis is aimed to study the properties of the X-ray spectrum of Mrk 110
and compare them with those inferred from optical spectroscopy.
Methods.We make use of detailed timing and spectral analysis as well as high resolution
X-ray spectroscopy with the XMM-Newton gratings.
Results.We find a narrow Fe K fluorescent line,
a broad component (16 500 km s-1) of the O VII triplet,
either due to infall motions or gravitational redshift effects in the vicinity
of the central black hole, a Comptonized accretion disk layer, and a strong starburst component.
Conclusions.We found that Mrk 110 has a complex X-ray spectrum, exhibiting
relatively strong broadening of the O VII emission line, probably associated with X-ray emission
from the Broad Line Region (BLR), which might be correlated with the optical gravitationally redshifted,
asymmetric line profiles.
Spectral fits including a Gaussian line or a discline give
the same statistical significance. If the broad redshifted soft X-ray components are due to gravitational
redshift effects, the distance of the line-emitting regions ranges between about 0.2 and 1 light day with
respect to the central black hole.
In addition, the EPIC pn spectrum shows a double power-law and a strong starburst component. One power-law
component exhibits a photon index slope of , while the second is much steeper with
a power law slope of . The second power-law is most probably due to thermal
Comptonization of a hot electron layer above the accretion disk.
Mrk 110 is another example of extragalactic
sources showing Comptonization effects in the accretion disc and its properties are very similar to
the narrow-line Seyfert 1 Galaxy Ton S 180
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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