1,720,957 research outputs found
"Ossiculoplasty with a personal prosthesis"
No full textBiological and synthetic biocompatible materials have been used to perform ossiculoplasty operations.
Biocompatible materials have to respect three physical parameters: weight, density and rigidity.
The Authors suggest a new model of TORP made up by assembling a fragment of homologous rib cartilage with a steel Teflon piston. These materials show low antigenicity, being readily available and modellable during the costruction.
The prosthesis so assembled has the following dimensions: 4 mm in the major diameter, 0,6 mm in the minor diameter, 6,5 mm in the maximum length.
The total weight is 20 mg and is compatible with the biodinamic mechanisms of the inner ear, even if both weight and length can be reduced according to the anatomo-surgical context by cutting the TORP.
The prosthesis has been applied since October 1991 with good functional results at the planned follow-up
"Sindrome di Goldenar. Caso clinico"
No full textLa sindrome di Goldenhar è una displasia oculoauricolovertebrale, dovuta a mancato o erroneo sviluppo del primo e secondo arco branchiale, che va distinta dalla Sindrome di Treacher-Collins e dalla microsomia emifacciale. E' caratterizzata da anomalie orbitarie, fusione delle vertebre cervicali, ipoplasia mascellare e malformazioni a carico dell'orecchio esterno e medio.
Gli Autori riportano il caso di un bambino, maschio di 8 anni, che giungeva alla loro osservazione per una ipoacusia di tipo trasmissivo dell'orecchio sinistro. Il paziente è stato sottoposto in anestesia generale a timpanotomia esplorativa seguita da stapedotomia.
L'opportunità di eseguire un trattamento chirurgico delle malformazioni dell'orecchio medio nei pazienti affetti da sindrome di Goldenhar si rende necessaria per ripristinare la capacità uditiva binaurale e consentire un migliore apprendimento del linguaggio in età scolare
"Fistola perilinfatica della finestra rotonda di natura post-traumatica"
No full textLa fistola perilinfatica è una anomala comunicazione tra il labirinto membranoso e la cassa timpanica attraverso una soluzione di continuo della finestra rotonda, di quella ovale o di entrambe.
In questo lavoro viene riportato il caso di P.A. (sesso F., anni 20) con perforazione traumatica della membrana timpanicadi destra associata ad ipoacusia improvvisa destra, acufeni e vertigini.
L'indagine audiologica e quella vestibolare associate alla timpanotomia esplorativa evidenziavano la presenza di una fistola perilinfatica della finestra rotonda. La chiusura della fistola è stata realizzata con Tissucol e frammenti di Gelfoam apposti sulla finestra rotonda.
A tre mesi dall'intervento l'esame audiometrico tonale ha mostrato il recupero quasi totale del deficit uditivo e si è assistito alla scomparsa dei sintomi vestibolari e degli acufeni
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
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
- …
