1,720,978 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
New perspectives for the treatment of thoracic aortic aneurysm with self-expanding endoprostheses: Preliminary experience
No full textPreliminary experiences of the University of Parma study group on The diagnosis and treatment of chronic constipation
No full textThe authors present a report of their study on a group of patients affected by serious chronic constipation undergoing multidisciplinary evaluation by a radiologist, a neurologist and, if necessary, also a psychiatrist. From June 1989 to October 1990, 40 patients were examined using anal manometry, intestinal transit time, proctogram and electromyography of the pelvic floor. The examinations carried out by the different specialists led to the following results: 10 patients were found to be affected by slowed transit due to right colon constipation; in 16 cases, spastic pelvic floor syndrome (S.P.F.S.) was diagnosed; 5 subjects showed a rectocele which in 3 was associated with S.P.F.S.; 3 patients presented with an anterior rectal prolapse; in 6 cases the diagnosis was perineal descent syndrome, associated in 3 cases with S.P.F.S.; the remaining 6 subjects manifested a diminished ampullary sensitivity. This experience reveals the complexity of the alterations that, alone or in association, cause chronic idiopathic constipation. The authors' conclusion is that a correct diagnostic approach requires close collaboration between various specialists, who, by careful examination of different aspects of the colo-recto-anal region, arrive at an accurate physiopathological diagnosis leading to the most suitable therap
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
TRATTAMENTO CONSERVATIVO MEDIANTE EMBOLIZZAZIONE PERCUTANEA DEI TRAUMI SPLENICI
No full textSCOPO lo scopo di questo lavoro è quello di valutare i risultati della nostra esperienza sull’ embolizzazione transarteriosa nei pazienti con lesioni della milza.
MATERIALI E METODI
abbiamo raccolto in maniera prospettica da gennaio 2006 a novembre 2011 i dati di 99 pazienti ( 70 maschi e 29 femmine, età media 36 aa) che sono stati ricoverati presso il nostro ospedale.
Di questi, 12 pazienti sono stati sottoposti a laparotomia e splenectomia d’urgenza, 53 sono stati sottoposti a semplice osservazione e 34 sono stati trattati con embolizzazione dell’arteria splenica, mediante l’uso di spirali. Embolizzazione prossimale è stato scelto in 23 casi, embolizzazione distale è stata preferita in 11pazienti.
RISULTATI
Si è ottenuto in tutti i casi successo tecnico immediato e successo clinico in 30 pazienti. . In 30/34 casi (88 %) non sono state osservate complicazioni periprocedurali, mentre i restanti pazienti sono stati sottoposti a splenectomia per sanguinamento ricorrente.
CONCLUSIONI
L’alto tasso di successo e di conservazione della funzionalità dell’organo (88 % ) giustifica l’ impiego dell’embolizzazione dell’arteria splenica in pazienti emodinamicamente stabili o stabilizzati dopo trasfusione
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