1,720,972 research outputs found
Estudio comparativo de RM perfusión en pacientes diagnosticados de hidrocefalia normotensiva con pacientes controles
Full text linkDiversos estudis han demostrat que existeix una disminució en la irrigació de la substància blanca periventricular en pacients diagnosticats d'hidrocefàlia normotensiva quan es comparen amb subjectes normals. Amb l'objectiu de demostrar aquestes troballes, pacients afectes d'aquesta patología es van sotmetre a una RM cerebral morfológica, un estudi de dinàmica de fluxe de LCR i un estudi de perfusió. Amb aquestes exploracions es va demostrar un augment en l'índex d'Evans i una disminución dels valors de VSC (Volum Sanguini Cerebral) de la substància blanca periventricular als pacients casos enfront dels controls.Diversos estudios han demostrado que existe una disminución en la irrigación de la sustancia blanca periventricular en pacientes diagnosticados de hidrocefalia normotensiva cuando se comparan con sujetos normales. Con el objetivo de demostrar estos hallazgos, pacientes afectos de dicha patología se sometieron a una RM cerebral morfológica, un estudio de dinámica de flujo del LCR y un estudio de perfusión. Con estas exploraciones se demostró un aumento en el índice de Evans y una disminución de los valores de VSC (Volumen Sanguíneo Cerebral) de la sustancia blanca periventricular en los pacientes casos frente a los controles
Estudio comparativo de los valores de difusión por RM de las radiaciones ópticas en pacientes diagnosticados de síndrome clínico aislado con pacientes controles
Full text linkDiversos estudis han demostrat que, en pacients amb esclerosi múltiple, existeixen alteracions als paràmetres de difusió mesurats amb Resonància Magnètica als tractes de substància blanca que es mostren aparentment normals en les seqüències convencionals. Amb l'objectiu de demostrar si aquestes alteracions apareixen precoçment en la fase de síndrome clínic aïllada, es van analitzar una sèrie d'estudis de Resonància Magnètica cerebral amb seqüències potenciades en difusió i tractografia de les radiacions òptiques, de pacients amb el diagnòstic de síndrome clínic aïllada i pacients controls, mesurant en tots ells els valors dels paràmetres principals de difusió: coeficient de difusió aparent y fracció d'anisotropia. Amb aquestes exploracions no es van demostrar alteracions als paràmetres de difusió en fases tan precoces de la malaltia als pacients casos davant els controls.Diversos estudios han demostrado que, en pacientes con esclerosis múltiple, existen alteraciones en los parámetros de difusión medidos por Resonancia Magnética en los tractos de sustancia blanca que se muestran aparentemente normales en las secuencias convencionales. Con el objetivo de comprobar si estas alteraciones aparecen precozmente en la fase de síndrome clínico aislado, se analizaron una serie de estudios de Resonancia Magnética cerebral con secuencias potenciadas en difusión y tractografía de las radiaciones ópticas, de pacientes con el diagnóstico de síndrome clínico aislado y pacientes controles, midiendo en las mismas los valores de los parámetros principales de difusión: coeficiente de difusión aparente y fracción de anisotropía. Con estas exploraciones no se demostraron alteraciones en los parámetros de difusión en fases tan precoces de la enfermedad en los pacientes casos frente a los controles
Art and Challenges Involved in the Treatment of Ischaemic Damage
No full textThis edited volume Art and Challenges Involved in the Treatment of Ischemic Damage is a collection of reviewed and relevant research chapters, offering a comprehensive overview of recent developments in this specific field. The book comprises single chapters authored by various researchers and edited by an expert active in the research area. All chapters are complete in themselves but united under a common research study topic. This publication aims at providing a thorough overview of the latest research efforts by international authors and experts in the field of study and at opening new possible research paths for further novel developments
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
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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