1,721,046 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
A spectroscopic study of the open cluster NGC 6475 (M 7)
Full text linkAims. Clusters of stars are key objects for studying the dynamical
and chemical evolution of the Galaxy and its neighbors, and are
the most important laboratories to test the theory of stellar evolution. In particular, chemical
composition is obtained from different kinds of stars (hot main-sequence
stars, cool main-sequence stars, horizontal-branch stars, RGB stars) using different
methodologies. Our first aim is to apply these methodologies to the stars
of the open cluster NGC 6475 and, by obtaining a census of the most
important elements, we will be able to test their consistency.
Our second aim is to study the evolution of the surface chemical
abundances as a function of the evolutionary phase of a star.
We finally want to establish more robust fundamental parameters for this cluster.
Methods. We selected high S/N high resolution spectra of 7 stars of the open cluster NGC 6475 from
the ESO database covering the Teff range 4500–10 000 K and of luminosity
class V (dwarf) and III (giants).
We determined the chemical abundances of several elements. For hot stars
( K), we applied the Balmer line fitting method
to obtain atmospheric parameters, while for cool stars ( K),
the abundance equilibrium of FeI/II lines. For the two groups
of stars, the use of different line-lists was mandatory. LTE approximation
together with NLTE correction for some elements (C, N, O, Na, Mg)
were applied. The abundances of many elements were obtained
by measuring of the equivalent width of spectral lines. For those ones
having only blended lines (O, He), real spectra
were compared to synthetic ones. Hyperfine structure was taken into
account for V and Ba.
Results. First of all, we showed that the two methodologies we used give abundances
that agree within the errors. This implies that no appreciable relative
systematic effects are present for the derived chemical content of cool and hot stars.
On the other hand, giants stars show clear chemical peculiarities with
respect to the dwarfs affecting light elements (up to Si) and maybe Ba.
This can be explained as an evolutionary effect.
Then, once we had a new estimation of the metallicity for the cluster
([Fe/H] , [ α/Fe] ),
we fitted suitable isochrones to the CMD of the cluster to obtain
the basic parameters (E() , (), Age )
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
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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