1,720,987 research outputs found
Chimica viticolo-enologica
No full textTesto di chimica viticola ed enologica con elementi di genetica e genomic
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
Variations 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
fMRI in Resting State as a Radiological Tool in Pharmaceutic Research: An Experimental Clinical Trial with Alprazolam
No full textPURPOSE: The aim of the study was to highlight the presence of modifications in the Default Mode Network (DMN) detected by means of fMRI in Resting State after
the administration of a neurotropic drug, the Alprazolam, and therefore to suggest fMRI as an alternative and non invasive tool for future pharmacological
experimentations in vivo.
METHOD AND MATERIALS: 11 healthy subjects (5 males; mean age: 32 years) were enrolled in a double-blind randomized study. They received Alprazolam or
placebo and underwent two fMRI scans each. Data were acquired at 1.5 T (Magnetom Symphony, Siemens, Enlargen, Germany). Functional connectivity and
activation maps were obtained by means of independent component analysis using FSL (FMRIB software Library 4.1, Oxford, UK). A F-test (p<0.05) was applied in
order to detect statistical differences between groups and Dual-Regression (p<0.05) permitted to obtain spatial maps defining the between-subject
group-consistency.
RESULTS: The reproducibility of fMRI in Resting State was demonstrated with a consistent detection of DMN in all subjects and all conditions, furthermore a
statistically non-significant difference between baselines was found (p<0,11242). The Dual-Regression analysis showed a diffuse significant higher functional
connectivity in the brain after the administration of Alprazolam, mainly in the precuneus/posterior cingulate cortex within the DMN, and also between the DMN and
other cerebral areas, in particular the basal ganglia. No significant differences in DMN were detected after placebo administration.
CONCLUSION: fMRI in Resting State reproducibility was demonstrated and connectivity modifications in DMN and other cerebral areas occur after Alprazolam
administration.
CLINICAL RELEVANCE/APPLICATION: fMRI should be considered an applicable model in humans during future clinical trials
Disease progression or pseudoprogression after concomitant radiochemotherapy treatment: pitfalls in neurooncology.
No full textDispelling 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
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