1,720,983 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
Preliminary estimation of water content in anhydrous mantle xenolith minerals from Predazzo (Dolomites) using nuclear microprobe
No full textNuclear microprobe: a tool for estimation of water content in anhydrous mantle xenolith minerals from the Predazzo area (Dolomites, NE Italy)
No full text32nd IGC Florence 2004: 1151
Hydrogen concentration in mantle xenoliths from the Veneto VolCanic Province (NE Italy).
No full textHydrogen contents were quantified in olivine (ol) and
clinopyroxene (cpx) grains using the nuclear microprobe. The
analysed minerals form spinel peridotite xenoliths with
protogranular to porphyroclastic texture, hosted in alkaline
basalts from two localities of the Eastern Veneto Volcanic
Province (NE Italy). Mineral compositions indicated good reequilibration at T-P upper mantle conditions (T = 850-950°C
and P = 1.7±0.04 GPa). A combination of ERDA (Elastic
recoil Detection Analysis) and RBS (Rutherford Back
Scattering) methods were used for H measurements
(Laboratoire Pierre Süe, France). The following analytical
conditions were applied: 4He+ energy = 3.0 MeV, beam spot
size = 4x4 μm2, 4x16 μm2 for ERDA, scanned on large sample
areas, scattering angle = 170°, recoil angle = 30° (see also
Bureau and co-workers, this issue). 22 samples were prepared
following a specific protocol in order to decrease the effect of
H absorbed at the surface of the polished samples. The same
grains were analysed with electron microprobe, in order to
check possible chemical heterogeneities in the areas
investigated by ERDA. Chemically homogeneous ERDA
maps were selected using Daudin et al. (2003): results
reported below are referred to H depleted zones: Sample Wt ppm H H2O ppm wt oxyde Tot rel uncert
Ol-vpol2 24 213 15
Ol-vsol4 17 145 15
Cpx-vppx2 50 444 14
Cpx-vspx3 45 398 13
All cpx grains show H contents in the ranges reported from the literature for mantle analogue phases, obtained by commonly used IR spectroscopy, whereas ol grains have H concentrations close to or higher than maximum values reported for mantle ol (Ingrin & Skogby, 2000). Cpx samples systematically show H contents higher than those found for olivine: this is confirmed by recent IR data (Demouchy et al., 2006) and probably due to the fact that H diffusion at mantle temperatures is faster in olivine than in pyroxene
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
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