1,720,959 research outputs found
Micro-Raman spectroscopy characterization of glass/refractory interfaces: A tool to improve the quality of the industrial glass production
No full textWe report on micro-Raman spectroscopy as a tool to improve the quality of the industrial glass production. Crystalline inclusions, commonly called stones, are very dangereous defects present in industrial glass products. To minimize this technological problem, the detailed knowledge of the formation and transformation processes of these defects is required, and a complete identification of the different phases requires a multianalytical approach. Micro-Raman measurements were performed on a series of laboratory samples with different chemical compositions. Performing linear scanning and mapping of Raman features, we obtained a well-defined characterization of the evolution and nature of stones. In addition, information on the crystallization degree of the reaction layers was obtained by correlating the shape and intensity of the photoluminescence of Cr3+ impurities
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
Combined SEM-EDX and mu-Raman spectroscopy for the characterisation of glass/Al-rich refractory interfaces
No full textCrystalline inclusions, commonly called stones, are very dangerous defects present in industrial glass products. Refractory materials of the furnace, raw materials and ceramic grains introduced with glass cullet, are the main sources of stones. To improve the quality of glass products, the understanding of the mechanisms responsible for the formation and the transformation of these defects is required. At the interface glass melt/stone surface several reactions occur leading to the formation of new glassy and crystalline micro-phases. These phases are usually studied by scanning electron microscopy and X-ray microanalysis on polished cross sections. Nevertheless SEM-EDX chemical analysis alone does not allow the complete identification of the different phases. In this work, the reactions occurring between refractory materials and the molten glass were studied with a micro-chemical and micro-textural approach completed by micro-structural investigation. Compositional and textural features were investigated by SEM-EDX and by μ-Raman spectroscopy. Raman spectra of pure crystalline well identified compounds were compared with those of the unknown phases. This technique allowed to identify the nature of the re-crystallized phases. The combined use of SEM-EDX and μ-Raman techniques revealed to be very promising in the study of the origin and in the characterization of stones in glass. © 2008 Springer-Verlag
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
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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