1,720,974 research outputs found
[Reconstruction technique after pancreaticoduodenectomy].
No full textThe many techniques proposed for the reconstruction of the digestive path after pancreaticoduodenectomy show the continuous research of the most anatomical and safest way to achieve the best results. Most of the technical variations concern the treatment of the pancreatic stump and are directed to prevent the pancreatic fistula that is the most frequent cause of postoperative mortality and morbidity. None of the pancreatico-digestive reconstruction ways is absolutely better than the others and we think neither the total obstruction of the Wirsung duct is the solution of the problem of the pancreatic fistula. The accuracy and technical precision, the availability to modify the technique in relationship to different anatomy and functional conditions of the pancreatic stump are essential to improve the results. To achieve this goal is decisive the experience and patients volume of the surgeon and of the institutional team
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
[Vascular problems in destructive pancreatic surgery].
No full textObstacles of vascular type may hinder or prevent pancreatic destruction for tumours of the pancreas or periampullary tumours. Out of 72 major pancreatic demolitions (cephalic duodenopancreatectomy or subtotal pancreatectomy from rt to lt) there were vascular difficulties on 26 occasions (36\%), of which 15 were in existence prior to development of the neoplasia (anomalies of rise and course of peripancreatic vessels, stenosis/obliteration of the common hepatic artery in pancreatic head or periampullary tumours) and 11 due to tumoral growth (direct involvement of the mesenteric-portal tract, the hepatic artery and the superior mesenteric artery). The technical solutions used are discussed individually in the light of the physiopathological repercussions consequent on any temporary or permanent interruption of important hepatic and splanchnic vascularisation vessels (hepatic artery and various mesenteric a.), in relation to operating mortality and the prospects of long-term survival. In the most complex cases of direct vascular involvement by the neoplasia, the Author's trend was orientated to a position which, while accepting demolition decisions useful for the widening of the surgical radicality margins, nevertheless avoids extensive demolition solutions imposed by conditions of necessity or considerations of principle that probably do not bring significant advantages as regards long-term prognosis for these tumours
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