1,720,965 research outputs found
A randomized controlled trial of mesentericocaval shunt with autologous jugular vein
No full textAfter a large uncontrolled experience, in April 1976, a randomized clinical trial between side-to-side portacaval anastomosis and a mesentericocaval shunt with internal jugular vein interposition was initiated. Up to April 1979, 23 patients were operated upon with a mesentericocaval shunt and 26 with a portacaval anastomosis. With a mean follow-up time of 23 months, no statistically significant differences in terms of operative mortality, hepatic encephalopathy and long term survival were found between the two operations. Therefore, a mesentericocaval shunt does not appear to offer effective advantages compared with the portacaval anastomosis, and it should be peformed in particular instances in which, for anatomic reasons, a portocaval anastomosis cannot be performed
[Role of portasystemic shunt in the remission of the hypersplenic syndrome in portal hypertension].
No full textAntonio M. Anza and his thesis on the layout of the Mexican railway
Full text link[EN] Antonio M. Anza is one of the most outstanding civil engineers in Mexico at the end of the 19th century. He designed and built important buildungs and installed the first Mexican civil engineering laboratory. His architectural and engineering studies were exemplary for his time. He wrote his thesis for his engineering degree on the layout of the Mexican Railway, a project in which he collaborated from 1873 onwards. In his thesis he gives us an explicit and extensive idea of the knowledge he acquired during his training. As a civil engineer on site, he gives us a contemporary view of the topographical considerations, structural designs, scientific bases and some of the actors involved. Comparing the content of the thesis with current knowledge about the Mexican Railway produces new and surprising results for the history of construction in Mexico.[ES] Antonio M. Anza es uno de los ingenieros civiles más destacados en México del fin del siglo XIX. Diseñó y construyó obras importantes e instaló el primer laboratorio mexicano de ingeniería civil. Sus estudios de arquitectura e ingeniería son ejemplares para su época. Escribe su tesis para obtener el título de ingeniero sobre el trazo del Ferrocarril Mexicano, un proyecto donde colabora a partir de 1873. En su tesis nos da una idea explícita y amplia de sus conocimientos adquiridos durante su formación. Como ingeniero civil presencial nos ofrece a la vez una visión contemporánea de las consideraciones topográficas, de los diseños estructurales, de las bases científicas y de algunos de los actores. Comparando el contenido de la tesis con los conocimientos actuales sobre el Ferrocarril Mexicano se producen resultados nuevos y sorprendentes para la historia de la construcción en México.Bühler Gminder, D. (2023). Antonio M. Anza y su tesis sobre el trazo del ferrocarril mexicano. Revista de Historia de la Construcción. 3:1-10. https://doi.org/10.4995/rdhc.2023.19191OJS110
Informe de los trabajos realizados en la Biblioteca "Antonio M. Anza" del Palacio de Minería
No full textEn el siguiente documento se plasman las actividades realizadas en la práctica de campo correspondiente al Seminario Taller Optativo de Material Bibliográfico, durante las cuales se sometieron a procesos de intervención libros de varias colecciones pertenecientes a la Biblioteca Antonio M. Anza. Los trabajos se llevaron a cabo en el taller de conservación y restauración del archivo histórico del Palacio de Minería del 26 de septiembre al 11 de octubre del año 2013,
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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
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
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