1,720,960 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
Chemometric study of annual changes and location differences of chemical and physical properties in the Ross Sea surface waters (Antarctica)
No full textDistributions of carbonate properties along the water column in the Mediterranean Sea: Spatial and temporal variations.
No full textSurface and water columnmeasurements of the total alkalinity and the pHwere recorded in the Mediterranean Sea
and in the Southern Tyrrhenian Sea fromMay–June 2007 and fromNovember 2006 and February 2008, respectively.
The measurements were conducted within the framework of the Italian VECTOR Research Project activities.
The total alkalinity was measured using a potentiometric titration with an open cell system. The pH was also
determined using a potentiometric method, with a combination of glass/reference electrode with an NTC
temperature sensor. The total alkalinity varied linearly with the salinity in the Mediterranean Sea and the
measure rangedbetween 2431 and 2638 μmol kg−1,withthe lowest values in the upper layer of thewesternmost
data stations (2431–2439 μmol kg−1). This pattern resulted from the influence of less salty water with lowalkalinity
intruding fromthe nearby Atlanticwaters.With respect to the seasonal variation, the data collected in
the Southern Tyrrhenian Sea did not have any statistically significant differences for the alkalinity parameter in
the water column layers. The measured pH exhibited high and variable values in the surface layer and an
increasing gradient from the western to the eastern Mediterranean data collection stations, particularly at
intermediate depths around 300–500 m. The minimum pH and the maximum of the total alkalinity were
commonly found at mid-depth in correspondence of the core of Levantine Intermediate Water.
The pCO2 valueswere calculated fromthe directmeasurements of the alkalinity and the pH. During the summer
of 2007, the pCO2 in the surface water of the Mediterranean was, on average, above the equilibrium with the
atmospheric pCO2, thus implying that the CO2was escaping the sea. Seasonalmeasurements at theVTMstation in
the Southern Tyrrhenian Sea indicated that the pCO2 surface values ranged from323 to 430 ppm,with the lowest
values in February 2007 and 2008, when the VTM station represented a sink for the atmospheric CO2. The Tracer
combining Oxygen, inorganic Carbon and total Alkalinity (TrOCA) was used to estimate the distribution of the
anthropogenic CO2. The results show that the entire water column has already been invaded by the
anthropogenic CO2 throughout the Mediterranean Sea. Generally, the concentrations of the anthropogenic CO2
in the intermediate and deep layers were higher than those measured in the Atlantic waters
Annual and spatial variations of chemical and physical properties in the Ross Sea surface waters (Antarctica)
No full textVariations 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
- …
