1,721,005 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Cyclic magma recharge pulses detected by high-precision strainmeter data: the case of 2017 inter-eruptive activity at Etna volcano
No full textUnprecedented ultra-small strain changes (~10 −8 –10 −9 ), preceding and accompanying the 2017
explosive-effusive activity, were revealed by a high precision borehole strainmeter at Etna. No pre- or
co-eruptive deformation was detected by the GPS measurements, which often fail to detect ground
deformation engendered by short-term small volcanic events due to their limited accuracy (millimetres
to few centimetres). Through the analysis and detection of ultra-small strain changes (few tens of
nanostrain), revealed by filtering the raw data, a significant time correspondence with the eruptive
activity is observed. For the first time, cyclic fast exponential strain changes, preceding the onset of
eruptive events, with a timescale of about 2–7 days, were detected. These variations are attributable to
the expansion of the shallow magma reservoir, which is replenished with new magma from depth during
the inter-eruptive periods. Interpreting the strain changes in terms of pressurization/depressurization
of the chamber due to the cyclic influx and withdrawal of magma, allows placing some constraints on
the magma recharge volume rate. A Finite Element model has been developed to simulate the temporal
evolution of the strain changes generated by the re-pressurization of a spheroidal magma source using
a dynamical approach. An average total mass budget of about 1–2 × 10 9 kg, which is in the range of the
erupted mass, is estimated to be accumulated within a shallow vertically elongated magma chamber
during the inter-eruptive periods. Such evidence demonstrates that the near-real time analysis of
strainmeter records is remarkable for its ability to record small transients and highlight recharging
phases preceding eruptive activity, which would go undetected with other current methodologies.
Under these conditions, the ability to simulate inter-eruptive periods offers an opportunity to estimate
the magma recharge rate with important implications for volcano hazard assessment.Publishedid 75534V. Processi pre-eruttiviJCR Journa
Viscoelastic modeling of deformation and gravity changes induced by pressurized magmatic sources
No full textGravity and height changes, which reflectmagma accumulation in subsurface chambers, are evaluated using analytical
and numericalmodels in order to investigate their relationships and temporal evolutions. The analysis focuses
mainly on the exploration of the time-dependent response of gravity and height changes to the
pressurization of ellipsoidalmagmatic chambers in viscoelasticmedia. Firstly, the validation of the numerical Finite
Element results is performed by comparison with analytical solutions,which are devised for a simple spherical
source embedded in a homogeneous viscoelastic half-space medium. Then, the effect of several model
parameters on time-dependent height and gravity changes is investigated thanks to the flexibility of the numerical
method in handling complex configurations. Both homogeneous and viscoelastic shell models reveal significantly
different amplitudes in the ratio between gravity and height changes depending on geometry factors and
mediumrheology. The results showthat these factors also influence the relaxation characteristic times of the investigated
geophysical changes. Overall, these temporal patterns are compatible with time-dependent height
and gravity changes observed on Etna volcano during the 1994–1997 inflation period. By modeling the viscoelastic
response of a pressurized prolate magmatic source, a general agreement between computed and observed
geophysical variations is achieved.Published264-2774V. Processi pre-eruttiviJCR Journa
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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