1,721,274 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
Multi-scale dissolution events in Western-Tethyan peritidal carbonates close to the Triassic/Jurassic boundary
No full textThe stratigraphical and sedimentological study of uppermost Triassic-lowermost Jurassic sections of peritidal carbonates, in north-western Sicily, allows to differentiate multi-scale dissolution events that affected the carbonate platform interior during the uppermost Rhaetian. The Triassic cycles show extensive phenomena of stratabound dissolution that can be differentiated in three main types: vug, moldic and “spongy-like”. The dissolution horizons are particularly concentrated in the subtidal members of cycles. The creation of different type of porosity seems to be mainly controlled by the textural characters of the host-rock. In particular the cm-scale bioturbation in muddy sediments, probably operated by crustacean decapods, results as the most important factor in determining the spongy-like pattern. Regarding the dissolution fluids responsible of the stratabound dissolution, the morphological comparison of the spongy-cavities with recent similar examples from modern carbonate platforms, coupled to geochemical data, supports the influence of a mixing water lens. In our case we think that a mixing water lens could have been established during the periodical exposure of the platform (documented by thick paleosols at the top of each cycles) thanks to a freshwater recharge from an adjacent exposed area. Later dissolution events, at a larger scale, are superimposed on the stratabound dissolution cavities. Giant caves up to 100 m in diameter, filled up by collapsed breccias, scattered over a distance of about 1 km, along a narrow stratigraphic interval. Among the breccia elements, the presence of clasts arising from the spongy-like horizons allow to postdate the creation of the cavern dissolution with respect to the stratabound dissolution. Up-section from the cave alignment, a karstified surface covered by a particularly thick red paleosoil, laterally correlated with a structure that is interpreted as a paleo-sinkhole, is considered as the subaerial surface connected to the cave system. The biostratigraphic data support a late Rhaetian age of this surface as the T/J boundary, based on the LO of Trasina hantkeni, falls about 100 m above the karstified surface. The amount of the exposed stratigraphic thickness during the formation of the cave system is estimated at about 130 m, a value that is difficult to explain only in terms of eustatic variation. So we consider, a possible influence of a tectonic control induced by the ongoing rifting relating to the opening of the adjacent Alpine Tethys
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
Spongy-like porosity in peritidal carbonates: An interaction of cyclic sea-level oscillations, fresh water supply and sediment texture
No full textThis paper focuses upon the analysis of a complex paleokarstic system recorded within uppermost Triassic
peritidal cycles in northwestern Sicily. Besides documenting spectacular karstification at the Triassic/Jurassic
boundary, it provides an example of stratabound ‘spongy’ or ‘swiss-cheese’ dissolution. On the base of field observations,
microfacies analysis, transmitted-light and cathodoluminescence petrography and stable-isotope
analyses we put forward an original model for the formation of this peculiar stratabound dissolution. It implies
a complex interaction of several controlling factors at the interface between the marine and meteoric diagenetic
realms during the relative cyclic oscillations of sea-level.
The presence of a fresh water supply from an adjacent emerged area is the key for the periodic formation of a
mixing water lens during the relative sea level lowstand that brought about the subaerial exposure of the platform.
The resulting dissolution pattern in the subtidal unit of a specific cycle is strongly controlled by the textural
features of the sediments. In the case of bioturbated wackestones the ‘spongy’ or ‘swiss-cheese’ pattern develops,
while inmollusk-rich beds biomoldic porosity occurs. Inwell-sorted subtidalmembers, such as algal grainstones,
the dissolution originates as randomly distributed vuggy porosity. During periodic flooding of the platform, a new
subtidal unit is formed and the dissolution stops as fully marine phreatic conditions are re-established
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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