1,720,973 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
U-Th/He and fission track dating in north-eastern Corsica (France): extensional versus erosional exhumation.
No full textDuring the Late Oligocene-to-Miocene, the Alpine Units of north-eastern Corsica experienced a rapid exhumation related to the extensional collapse coeval with the anticlockwise rotation of Corsica and the formation of the Provençal-Ligurian basin (Jolivet et al., 1998). During the same period of time, shallow-water basins formed in eastern Corsica where alluvial sediments interfingered with marine deposits and recorded the time of exposure to erosion of the Alpine Units and the growth of relief (Orszag-Sperber and Pilot, 1976).
New apatite (U-Th)/He and fission-track ages from Corsica record cooling rates as high as 30-40°C/Myr during Early-Middle Miocene when this region is affected by a relatively high geothermal gradient, and possibly by topographic thermal perturbations. Cooling rates are commonly less than 7.5°C/Myr from Middle Miocene to Present when the growth of relief is detected by fluvial adjustments as indicated by the variations in the source areas of alluvial deposits of Late Miocene age.
To analyze the roles of extensional exhumation versus topographic thermal perturbations and erosion, a simple one-dimensional model based on age-elevation-distance profiles has been applied to two case studies: namely the St. Florent basin, and the Tenda massif.
The Early-to-Middle Miocene St. Florent basin is bordered by ductile-to-brittle extensional shear zones dissecting the Alpine units. The thermochronometric data from the Alpine units along a transect across the base and the shoulder of the basin are analyzed through an age-elevation-distance profile. The model derived from this profile shows that under low-temperature conditions the fault bordering the St. Florent basin produced a vertical throw of 3-4 km, and therefore supports the major role of extensional exhumation versus that of topographic thermal perturbations and erosion.
The Tenda massif is the most prominent relief of north-eastern Corsica with elevations up to 1535 m: to the east it is bordered by a low-angle extensional ductile shear zone, and to the west by a high-angle extensional fault. Rounded pebbles from the Tenda massif are included in the sediments of the St. Florent basin indicating that this massif has been exposed to erosion since Middle Miocene, at least. Apatite fission track and U-Th/He data from this massif show an inverse relation with relief, and this relation can be interpreted as either deriving from a thermal topographic perturbations followed by a decrease of relief due to erosion, or to extensional faulting. These two end-member hypothesis are investigated through an age-elevation-distance profile, and this suggests that the present relief of the Tenda massif could be the remnant of a much more elevated paleorelief, and also that extensional faulting under low-temperature conditions might have played a significant role in the surface uplift of this massif
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
Relief evolution in northern Corsica (western Mediterranean): Constraints on uplift and erosion on long-term and short-term timescales.
No full textThe long-term erosional evolution of relief is revealed by low-temperature thermochronometric data, whereas geomorphic features give constraints on the short-term evolution. We discuss the topographic evolution of northeastern Corsica by fission track and (U-Th)/He dating of apatite, the provenance of Neogene alluvial sediments, an analysis of uplifted strath terraces, and the shape of river profiles. Cooling ages indicate high cooling rates of up to 40_C/Myr during the early-middle Miocene, when this region was affected by extensional tectonics. Cooling rates are less than 7.5_C/Myr from the middle Miocene to the present, when topographic perturbations are detected by variations in the source areas of middle-to-late Miocene alluvial sediments and by the presence of large-scale irregularities along modern river longitudinal profiles. We suggest that the contrast of slow long-term erosion rates and the high local relief in the present Corsican landscape require that the landscape be in a transient state in response to a recent tectonic event
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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