1,720,959 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
[Polygraphic studies in ischemic heart disease. Correlation with the findings of left cineventriculography]
No full text[Correlation between results of bicycle stress test and coronaric arteriography. Study of 153 patients (author's transl)]
No full textIn 153 patients the results of bicycle stress test were compared with data obtained from coronaric arteriography. There were corresponding results from both tests in most cases. There are other discrepancies which cannot be explained by defining the stress test as "unspecific" or "not very sensitive". In fact, each time, time differences can be referred, besides method limits, to particular physio-pathological stages of the coronaric disease (collateral circulation, Prinzmetal angina) or they can be considered completely independent of the coronaric disease (myocardial disease without coronaric disease, enzymatic defects; haemoglobinic alterations, etc.). The two tests have different indications, but they can also complementary information
[Regional kinetics of the left ventricle with regard to the development of anastomotic circulation in coronary disease patients]
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[Thoracic pain and dyssynergia of the left ventricle in rheumatic valvulopathies. Correlation with coronary arteriography in 131 patients]
No full text[Morpho-functional changes of left ventricle produced by sublingual nitroglycerin (author's transl)]
No full textTwo successive left ventriculargraphs [in basal conditions and after Nitroglycerin (TNG)] were performed with the same technical procedures in 20 patients before coronary arteriography. End-diastolic and end-systolic volumes and ejection fraction were studied following Greene's modified method. Diastolic and systolic ventricular projected images were divided into four zones and their variations were evaluated after TNG. Two patients did not show any significant abnormality (pseudoangor); two others suffered from cardiomyopathy (myocardosis) with mitral regurgitation and no coronary artery disease; two had restrictive cardiomyopathy. Fourteen had a coronary artery disease: seven of them had signs of end-systolic mitral regurgitation. End-diastolic and end-systolic volumes decreased and ejection fraction increased after TNG in all of these cases except in the two suffering from cardiomyopathy (ESV increased and EF decreased). Mitral regurgitation disappeared in all of them. In patients with coronary artery disease and mitral regurgitation the volume variations were slighter, and the increase of EF was larger than in the other cases. Finally, a decrease in asynergic and hypokinetc zones was observed, whereas no variations were seen in diskinetic zones. TNG can improve left ventricular kinetics by decreasing the pre-load, the after-load and myocardial oxygen consumption. Demonstration of this improvement could be of prognostic value
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