1,720,976 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
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
Biophysical and morphological studies of erythrocyte membrane from patients with Duchenne muscular dystrophy and in carriers
No full textTranscranial Doppler Sonography As A Diagnostic-tool In Vascular Dementia
No full textTranscranial Doppler monitoring of the flow velocity at the level of the middle
cerebral artery was performed in 40 demented patients, 20 with multi-infarct
dementia (MID) and 20 with senile dementia of the Alzheimer type (SDAT), and in
25 age-matched controls. The following conditions were evaluated: (1) rest; (2)
60 s hyperventilation; (3) longest possible apnea, and (4) 5 min closed-circuit
air rebreathing. We also measured: PaCO2 levels at rest and under stimulus
conditions; mean flow velocity and pulsatility index (PI) at rest, and percentage
velocity variations. The PIs were higher and the velocity decrease during
hyperventilation was lower in all demented patients than in the healthy group; no
side-related asymmetry in rest values or in vasomotor responses to CO2 changes
was regularly detected in any group. On the contrary, rest flow velocities and
vasomotor responses to hypercapnia induced by both apnea and rebreathing tests
proved to be lower in MID patients than in SDAT and healthy groups. These
alterations were neither exclusive to MID patients nor homogeneous, therefore
some caution should be taken when evaluating single cases
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