1,721,005 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
The Nature and Evolution of Far-Infrared Luminous Galaxies
Full text linkThis Thesis presents a study of the nature and evolution of far-infrared (FIR) luminous
galaxies using sources selected at 70 μm from the Spitzer Wide-area InfraRed
Extragalactic (SWIRE) Survey. The SWIRE survey was the largest of the legacy surveys
conducted by the Spitzer Space Telescope covering 49 deg² in six fields. The nature of
the FIR sources was explored by obtaining spectroscopic follow-up observations of 70 μm
sources selected from the SWIRE Lockman Hole (LH) and XMM-LSS fields. The observations
were carried out at the William Herschel Telescope (WHT) using the multi-object
spectrograph AF2/WYFFOS. The data were first reduced and calibrated using standard
IRAF routines and redshifts measured by identifying emission and absorption lines. The
data reduction and redshift measurement steps are described in detail. The spectra were
then used to determine the optical and IR properties of 70 μm sources by performing
emission line diagnostic and modelling the multiwavelength spectral energy distribution
(SED) for these objects. The evolution of FIR luminous galaxies is investigated by constructing
70 and 160 μm and total IR (TIR) luminosity functions (LFs) for all 70 and 160
μm sources in SWIRE LH and XMM-LSS with a measured spectroscopic redshift. In this
work the evolution of the 70 μm and TIR LFs was investigated to redshift, z = 1.2, and
the evolution of the 160 μm LF was computed to z = 0.5. The final work, was carried
out by including 70 and 160 μm sources with photometric redshifts and studying the evolution
of FIR luminous galaxies to z = 2 and z = 1.5 respectively. The evolution of the
TIR LF was also determined using the 70 μm sample to z = 2. The work presented in
this Thesis utilises, for the first time, a parametric Bayesian method to study the evolution
of IR galaxies
Multi-wavelength investigations of herschel-selected dusty star-forming galaxies
No full textDusty Star-Forming Galaxies (DSFGs) are found to dominate the cosmic star formation rate density at z>1 and are much more populous at z~2 than locally. Interstellar dust, as a by-product of star formation, absorbs about half of the UV and optical emission from stars and star formation and re-emit as infrared radiation. Moreover, DSFGs are likely progenitors of current-day elliptical galaxies which are commonly found in the cores of massive galaxy clusters. They are thus believed to trace massive overdensities, especially those at z>4. However, high redshift DSFGs and the environments they reside in still remain poorly understood, partially due to the lack of observations of high redshift DSFGs and their associated environments. This thesis presents a series of results which aim to better understand the nature of high redshift DSFGs and the environments they reside in. We first present 1.28GHz radio observations of three Herschel-Planck selected candidate DSFG protoclusters. With accurate positions acquired from the radio observations, we find that there are potentially z>1 overdensities aligning with two of the candidate protoclusters. We further present deep infrared observations of 13 Herschel-Planck selected candidate DSFG protoclusters. By constructing multi-wavelength photometry for sources extracted from our observations, we find that 6 of the 13 candidate DSFG protoclusters align with overdensities at 44 DSFGs. We find a mean redshift of =3.874+/-0.233 for our sample. Their SFR-stellar mass relation implies that either our z<3.8 500 sources are starbursts which are more intense than typical star-forming galaxies at similar redshifts, or their redshifts are underestimated. Finally, we discuss potential follow-up studies based on the work begun here, and the outlook of DSFG studies in the future.Open Acces
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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