1,721,148 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
Interacting galaxies in the IllustrisTNG simulations -- IV: Enhanced Supermassive Black Hole Accretion Rates in Post-Merger Galaxies
Full text linkWe present an analysis of the instantaneous supermassive black hole (SMBH)
accretion rates in a collection of 1563 post-merger galaxies drawn from the
IllustrisTNG simulation. Our sample consists of galaxies that have experienced
a merger in the last simulation snapshot (within ~160 Myrs of coalescence) in
the redshift range 01:10 and post-merger
stellar masses > . We find that, on average, the accretion
rates of the post-mergers are ~1.7 times higher than in a control sample and
that post-mergers are 3-4 times more likely to experience a luminous active
galactic nuclei (AGN) phase than isolated galaxies. SMBH accretion rate
enhancements persist for ~2 Gyrs after coalescence, significantly exceeding the
~500 Myr lifetime of star formation rate enhancements. We find that the
presence of simultaneous enhancements in both the star formation and SMBH
accretion rates depends on both the mass ratio of the merger and on the gas
mass of the post-merger galaxy. Despite these accretion rate enhancements, only
~35% of post-mergers experience a luminous AGN ( erg/s) within
500 Myrs after coalescence, and fewer than 10\% achieve a luminosity in excess
of erg/s. Moreover, only ~10\% of the highest luminosity
( erg/s) AGN in the IllustrisTNG galaxy sample are recent
mergers. Our results are therefore consistent with a picture in which mergers
can (but don't always) trigger AGN activity, but where the majority of galaxies
hosting high luminosity AGN are not recent mergers.Comment: This article has been accepted for publication in Monthly Notices of
the Royal Astronomical Societ
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
Biodegradation and proton exchange using natural rubber in microbial fuel cells
No full textOne of the constraints holding back microbial fuel cell (MFC) progress is the cost of reactor components. Utilising waste materials could make the technology more desirable opening up the potential for novel niche applications. A costly but vital constituent of the MFC is the IEM (ion exchange membrane), a material prone to failure over time. The current study investigated the use of natural rubber as an alternative to IEM in MFCs. Initially, the material proved impermeable to protons, but gradually a working voltage was generated that improved with time. After 6 months the latex MFC outperformed anion exchange membrane (AEM) but was inferior both in terms of power (109%) and current (16%) to cation exchange membrane (CEM). After 11 months, latex outperformed both commercially available IEMs where power (12%) and current (54%) were higher than CEM. A combination of continuous latex MFC improvement with CEM decline, possibly due to biofouling, was responsible for this superiority. SEM images revealed pores in the used latex suggesting that biodegradation was enabling proton exchange. The research demonstrates for the first time that the biodegradation of a ubiquitous waste material operating as IEM can benefit MFC performance while also improving the reactors lifetime compared to commercially available membranes
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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