1,721,051 research outputs found
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
Metal-Ceramic Composites: A Study Of Small Metal Particles (Divided Metals)
No full textMetal particles in and composites prepared by the reduction of the xerogels have been investigated by high resolution electron microscopy and x-ray diffraction. The alumina phase is essentially amorphous while the metal particles are crystalline. The average size of the metal particles increases with the metal content in the composites. Pt atoms exhibit a greater tendency to form metal clusters than the Ni atoms. At low metal concentrations (0.25 wt%), the number of atoms in the metal particles is in the range 100–400. Lattice resolution of the metal particles has been observed in HREM images. The cubic phase of is stabilized in composites, the stability increasing with the Ni content
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
High resolution electron microscopy of bismuth oxides with perovskite layers
No full textLayered bismuth oxides of the general formula where A = Bi or Ba, B = Ti, Fe, W and n = number of perovskite layers have been investigated by high resolution electron microscopy. Lattice images obtained for n = 1 to 6 members show stacking of (n-1) perovskite layers sandwiched between dark bands due to the layers. It was possible to resolve the perovskite layer structures in some of the oxides. A highly ordered structure was observed upto the n = 3 member, whereas higher members show superstructures, dislocations and stacking faults arising from the side-stepping of layers as well as ferroelectric domain walls
Influence of Structural Defects on Gas Adsorption Properties of Anthophyllite Asbestos
No full textThe surface area of anthophyllite asbestos variants with different stages of fiber development is found to be not proportional to the fineness of the fibrils. Coarser variants have transitional pores whereas the asbestiform is microporous. HRTEM images show structural intergrowths of in an anthophyllite lattice, whereas the intergrowths are absent in the asbestiform anthophyllite. Conversion of brucite intergrowth into a noncrystalline phase results in the generation of transitional pores
Transformation of the metastable cubic form of ZrO2 to the monoclinic form in xerogels and metal-ZrO2 composites: a kinetic study
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