1,721,152 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
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
Study Of Volcanic Risk Through 40Ar/39Ar Elevated Precision Datings Of Neapolitan And Phlegraean Volcanic Deposits
No full textThe Neapolitan area extends, virtually unbroken, from
the Bay of Naples to the Bay of Pozzuoli hosting some
of the most densely populated districts in Europe. The
geological nature of this volcanic territory, and the presence
of three active volcanic zones (Vesuvius, Campi
Flegrei, and Ischia), poses a high risk for all the inhabitants
(1.5 millions) and the tourists. The autochthonous
volcanism in the Neapolitan urban area has been investigated
to fully evaluate the volcanic risk in this urban
environment. That has been made through 40Ar/39Ar elevated
precision dating on samples obtained from eight
volcanic deposits cropping out in the Neapolitan area.
By using this dating technique, it is possible to obtain
radiometric ages with a 2σ less than 1000 years. Instead,
through stratigraphic hypothesis has been only stated
that the volcanism in the Neapolitan urban area started
before the Campanian Ignimbrite eruption (39 ka) and
possibly ended about few thousand years ago with minor
eruptions building small tuff cones. Therefore, there
have been measured, with the high sensitivity MAP216
mass spectrometer, argon isotopes extracted stepwise
thermally from those samples previously irradiated.
Then, from these measurements, the ages were evaluated
in two ways. One way is to plot all the apparent
ages vs the cumulative 39Ar released (Age Spectrum),
to calculate a Weighted Mean Plateau Age (WMPA) with
a 2σ precision. The other way is to plot the 40Ar/36Ar ratio
vs the 39Ar/36Ar ratio on an Isotope Correlation (Isochron)
Plot, to calculate an Isochron Age (IA) with a 2σ
precision. The oldest 40Ar/39Ar predates local tuff cones
above 78.43 ± 0.57 ka ago, and the youngest below
15.56 ± 0.36 ka. These results testify the existence of a
volcanic field in the Neapolitan area active for a much
wider period of time than previously believed
Elevated precision 40Ar/39Ar datings of neapolitan and phlegraean volcanic deposits using high sensitivity map216 mass spectrometer.
No full textEruptive history of Neapolitan volcanoes: constraints from 40Ar–39Ar dating
No full textThe city of Naples can be considered part of the Campi Flegrei volcanic field, and deposits within the urban area record many autochthonous pre- to post-caldera eruptions. Age measurements
were carried out using 40Ar–39Ar dating techniques on samples from small monogenetic vents and more widely distributed tephra layers. The 40Ar–39Ar ages on feldspar phenocrysts yielded ages of c. 16 ka and 22 ka for events older than the Neapolitan Yellow Tuff caldera-forming eruption (15 ka), and ages of c. 40 ka, 53 ka and 78 ka for events older than the Campanian Ignimbrite caldera-forming eruption (39 ka). The oldest age obtained is 18 ka older than previous dates for pyroclastic deposits cropping out along the northern rim of Campi Flegrei. The results of this study allow us to divide the Campi Flegrei volcanic history into four main, geochronologically distinct eruptive cycles. A new period, the Paleoflegrei, occurred before 74–78 ka and has been proposed to better discriminate the ancient volcanism in the volcanic field. The eruptive history of Campi Flegrei extends possibly further back than this, but the products of previous eruptions are difficult to date owing to the lack of fresh juvenile clasts. These new geochronological data, together with recently published ages related to young volcanic edifices located in the city of Naples (Nisida volcano, 3.9 ka) testify to persistent activity over a period of at least 80 ka, with an average eruption recurrence interval of ∼ 555 years within and adjacent to this densely populated city
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