1,720,961 research outputs found
L'artrografia del ginocchio nello studio degli spandimenti posteriori. Tecnica e primi risultati
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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
Role and accuracy of rapid on-site evaluation of CT-guided fine needle aspiration cytology of lung nodules
No full textOBJECTIVE: To prospectively investigate the role of trans-thoracic fine needle aspiration cytology (FNA) and the value of rapid on-site evaluation (ROSE) in the clinical management of patients with pulmonary nodules/masses. Computed tomography (CT)-guided FNA is commonly employed for the diagnosis of lung lesions although its position in the diagnostic work-up is still a matter of debate.
METHODS: We reviewed 311 patients (211 males and 100 females, mean age 69.5 years) admitted to the University of Padova from 2004 to 2008, correlating the results of cytology with the available histological findings obtained from biopsies, surgery or autopsy.
RESULTS: Smears were adequate in 305 cases (98%) and inadequate in six (2%); a diagnosis of malignancy was achieved in 263 cases (86.2%); 39 cases (12.8%) were classified as non-malignant; and three cases (1%) were classified as suspect for malignancy. When correlated with histology, FNA with ROSE discriminated malignant versus non-malignant lesions (Cohen's kappa 0.78), with three false negatives (sensitivity 96.3%, specificity 100%). Moreover, a satisfactory overall agreement of 71.4% was achieved in differentiating the cancer histological types. Pneumothorax occurred in 13 cases, haemoptysis in four, and chest pain in three. A single aspiration was sufficient in 79.6% of patients; two aspirations were needed in 17.4% and three in 3%. The low complication rate was related to the limited number of aspirations needed due to ROSE.
CONCLUSIONS: FNA with ROSE is a safe and useful tool in the diagnostic work-up of lung cancer patients, with no contraindications to its use as the first diagnostic procedure for all patients with peripheral lung lesions. FNA with ROSE should be reconsidered in the guidelines for diagnosing and managing lung cancer
Dispelling 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
Traumatic musculoskeletal changes in forearm and hand after emergency vascular anastomosis or ligation.
No full textWhether the best option for the emergency treatment of major forearm artery lesions is anastomosis or ligation is still debated in the literature. The choice may be influenced by the resulting long-term musculoskeletal changes relating to vessel patency and the surgical procedure used. Fifty-three patients who had undergone emergency surgery involving arterial microanastomoses for lesions affecting one or more major forearm arteries (with a preserved distal circulation) were reassessed in terms of anastomosis patency at the end of a long-term follow-up, using arterial plethysmography, eco-color Doppler, and magnetic resonance angiography. In a subset of 40 patients, changes in bone mineral density (BMD) and lean mass of the affected limb were compared with the contralateral healthy limb and correlated with vessel patency and severity of trauma, using peripheral quantitative computed tomography and dual X-ray absorptiometry. Functional performance was also tested with a dynamometer by means of the hand-grip test. At long-term reassessment, 75% of the microanastomosed vessels were patent. BMD showed significant impairments at and around the site of the lesion (Delta: -6%, P < 0.001) and distally thereto (Delta: -3%, P < 0.05), which correlated with vessel occlusion and trauma severity. The fracture risk consequently also increased. There was evidence of a significant loss of lean mass ( P < 0.01) and muscle strength in the affected limb, especially in cases of occlusion of a major vessel. Given the satisfactory outcome of the anastomotic procedures as opposed to the greater loss of bone mass, muscular mass, and strength in patients who had undergone arterial ligation, we suggest that anastomosis is always preferable to ligation, even in emergencies. Anastomosis enables overall limb function to be better preserved (both in the vicinity of the lesion and distally)
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