1,721,016 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
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
Radio activity reloaded: Young Stellar Objects as seen by VLA, VLBA, and ALMA
No full textIn recent years, high-energy processes in young stellar objects have largely been studied using X-ray observations. While it has been known for some time that radio observations provide complementary information on coronal activity, high-energy irradiation of both protoplanetary disks and planets, mass accretion, and jet formation, it is only now, with unprecedented observational capabilities, that we can systematically obtain this information. To highlight these capabilities, I will present results of radio surveys targeting the Orion Nebula Cluster (ONC), using the upgraded VLA and VLBA as well as ALMA, partly with simultaneous Chandra observations. Our deep VLA and Chandra observations have enlarged the sample of known radio sources in the ONC by a factor of more than 7, enabling detailed comparisons of X-ray and radio YSO populations while providing the first systematic set of simultaneous YSO radio and X-ray lightcurves. With these data, we can look into the detailed correlation of X-ray and radio flares from YSOs, including radio spectral index information. Improved VLBA capabilities now allow us to follow up hundreds of sources in an astrometric monitoring program that is producing both a definitive census of nonthermal emission and precision astrometry of embedded YSOs that remain out of reach for Gaia, thus complementing the Gaia mission by producing a proper motion survey of embedded YSOs and a rare cross-check of absolute astrometric measurements. Last but not least, we have now used ALMA to extend our scope of high-energy phenomena from gyrosynchrotron radiation in the centimeter wavelength regime to synchrotron radiation by obtaining a first systematic set of millimeter-wavelength lightcurves of Orion YSOs. Overall, these results highlight a new perspective on high-energy processes in YSOs while serving as a stepping stone for future surveys with the SKA and ngVLA.</p
An ionized outflow in Orion-KL source I?
Full text linkWe present images at 6 and 14 GHz of Source I in Orion-KL. At higher
frequencies, from 43 to 340 GHz, images of this source are dominated by thermal
emission from dust in a 100 AU diameter circumstellar disk, but at 6 and 14 GHz
the emission is elongated along the minor axis of the disk, aligned with the
SiO bipolar outflow from the central object. Gaussian fits to the 6, 14, 43,
and 99 GHz images find a component along the disk minor axis whose flux and
length vary with frequency consistent with free-free emission from an ionized
outflow. The data favor a broad outflow from a disk wind, rather than a narrow
ionized jet. Source I was undetected in higher resolution 5 GHz e-MERLIN
observations obtained in 2021. The 5-6 GHz structure of SrcI may be resolved
out by the high sidelobe structure of the e-MERLIN synthesized beam, or be time
variable.Comment: Accepted in Ap
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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