1,720,962 research outputs found
Proceso para obtención de alúmina activada conglomerada
No full textLa presente invención se desarrolla en el área de la industria química y petroquímica como medio para quelante de sustancias contaminantes en efluentes de proceso químicos. Se desarrolló un proceso para la obtención de alúmina activada aglomerada a través de su fase precursora denominada pseudobohemita, utilizando soltado de aluminio de bajo costo como materia prima
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Desarrollo de materiales adsorbentes para la remoción de componentes tóxicos en fuentes de agua
Get PDFEn este trabajo se muestra la preparación de un material adsorbente del tipo de las espinelas (MgAl2O4) para la remoción de arsénico en fuentes de agua naturales. Este material fue preparado por la combinación de los procesos de gelación y precipitación a partir de una solución mixta de sulfatos de aluminio y magnesio. El material obtenido se caracterizó por diferentes técnicas: Fisisorción de nitrógeno (resutando el área superficial específica mayor de 100 m²/g y un volumen de poro (Vp) entre 0,9 y 1,1 cm³/g. La difracción de rayos X (DRX) mostró que la estructura del material obtenido es típica de las espinelas. Por último, se puso a prueba la capacidad de adsorción de la espinela en contacto con el As disminuyendo la concentración de éste en las muestras dadas por debajo de la norma establecida.In this paper the preparation of an adsorbent material type spinels (MgAl2O4) for the removal of arsenic in natural water sources is shown. This material was prepared by combining the processes of gelation and precipitation from a mixed solution of aluminum sulphate and magnesium. The material obtained was characterized by different techniques: Nitrogen physisorption ( , resulting in higher specific surface area of 100 m² / g and a pore volume (Vp) between 0.9 and 1.1 cm³ / g. The X-ray diffraction (XRD) showed that the structure of the material obtained is typical of spinels. Finally, we tested the adsorption capacity of the spinel in contact with decreasing As concentration in the samples given it below the norm
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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