1,721,027 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
Ricostruzione del legamento crociato anteriore con tecnica a doppio fascio: valutazione comparativa su cadavere dei tunnel femorali eseguiti con tecnica in-out o out-in.
No full textIntroduzione. Recentemente sono state sviluppate diverse tecniche per la ricostruzione di entrambi i fasci (anteromediale, AM; posterolaterale, PL) del legamento crociato anteriore (LCA) con l’obiettivo di ripristinare una fisiologica cinematica articolare. Diverse sono le variabili che possono inficiare l’integrazione biologica degli innesti e ed il comportamento meccanico dei due fasci. La differenza tra il diametro dei tunnel all’emergenza articolare ed il diametro degli innesti è una tra queste.
Obiettivo dello studio è analizzare, mediante tomografia computerizzata (TC), i diametri dei tunnel femorali eseguiti con due diverse tecniche.
Materiali e Metodi. Lo studio ha incluso 8 ginocchia di 8 diversi cadaveri divisi in 2 gruppi.
Gruppo A: i tunnel femorali sono stati eseguiti mediante tecnica in-out. Il tunnel PL è stato eseguito attraverso il portale AM, mentre il tunnel AM attraverso il tunnel PL transtibiale.
Gruppo B: entrambi i tunnel, AM e PL, sono stati eseguiti mediante tecnica out-in utilizzando una guida sviluppata dal “senior author” (LP). Tutti i tunnel sono stati realizzati con una fresa da 7 mm. Entrambi i gruppi sono stati quindi sottoposti a valutazione TC con ricostruzioni sui piani coronale ed assiale. I diametri di entrambi i tunnel sono stati misurati sui due piani.
I dati sono stati analizzati con il Mann-Whitney t-test per campioni indipendenti. Il livello di significatività è stato posto a p<0.05.
Risultati. Il tunnel AM nel gruppo A era di 7.07 mm (range, 7 – 7.1) sul piano assiale e di 7.02 (range, 7 – 7.1) sul piano coronale. Il tunnel AM nel gruppo B era di 7.1 mm (range, 7 – 7.2) sul piano assiale e di 7.15 (range, 7 – 7.3) sul piano coronale. (p>0.05).
Il tunnel PL nel gruppo A era di 8.32 mm (range, 8.2 – 8.4) in assiale e di 8.45 (range, 8.4 – 8.5) in coronale. Il tunnel PL nel gruppo B era di 7.15 mm (range, 7 – 7.3) in assiale e di 7.02 (range, 7 – 7.1) in coronale. (p<0.05).
Discussione. Sino ad oggi non è stato dimostrato quale sia la migliore tecnica di ricostruzione a doppio fascio del LCA in termini di stabilità articolare e di evoluzione clinica. Tra le diverse variabili che possono condizionare il successo del trattamento ed un’eventuale revisione dell’innesto vi è l’allargamento dei tunnel femorali. Diversi autori hanno riportato, dopo ricostruzione a singolo fascio con diametri del tunnel femorale maggiore rispetto a quello dell’innesto, una maggiore difficoltà negli interventi di revisione del neolegamento.
L’esecuzione del tunnel femorale PL mediante tecnica out-in garantisce una migliore corrispondenza con il diametro dell’innesto all’emergenza articolare. Ciò riduce teoricamente la possibile instabilità del neofascio dovuta ad un diametro maggiore di partenza del tunnel osseo. Studi di biomeccanica in vitro e studi clinici prospettici randomizzati tra la tecnica in-out ed out-in potranno confermare tale ipotesi
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
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
Survey on motor activity in nuerseries in Trentino
No full textGoal of this project is to investigate the practice of motor activity of children 18 months -3 y old in organized contexts. To this aim we analysed the daily activities of 156 children in six nurseries of the Val di Sole e Val di Non in Trentino Alto Adige, Italy. Educators gave great importance to motor activities that they considered relevant for: socialization, motor development, hand eye coordination, balance, manuality, sensory development. Activities were categorized into 23 items: manipulation-based games, painting and musical activities and symbolic games are the most common forms of “motor activities” performed in Italian nurseries. Most of the activities were in the form of semistructural play. Fifty % of the nurseries has space specifically dedicated to motor activity. Despite what declared in the questionnaire, no motor objectives were established by the educators and conditions to practice the abilities perceived as important were not specifically programmed. The data underscore the difference between what is perceived as relevant and what is performed by educators and suggest that the major limitation for adequate motor activity levels in nurseries is lack of specific education by teachers
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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