1,720,982 research outputs found
Conventional and molecular approaches to isolates of Salmonella hadar from sporadic and epidemic cases
No full textHarnessing Surface Plasmons for Magnetic Resonance Imaging Applications
No full textHighly localized electromagnetic waves appearing in subwavelength structures, such as surface plasmons lying on a metal surface, are fundamental ingredients in nanophotonics since they offer novel routes for advanced subwavelength light control. Negative-magnetic-permeability metamaterials, already proposed for nuclear magnetic resonance imaging (MRI) applications, can also support magnetic-surface-plasmon excitations. Here we propose to exploit this phenomenon to increase MRI efficiency. We show that a negative-magnetic-permeability metamaterial slab, coupled to a standard radio-frequency surface coil, supports highly localized magnetic surface plasmons, allowing us to boost and to spatially manipulate the radio-frequency electromagnetic field. Our predictions indicate that the configuration considered holds great potential to enhance the MRI signal-to-noise ratio with respect to standard setups
Characteristics of Yersinia enterocolitica isolated from children with diarrhea in Italy
No full text
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
Use of novel metamaterials for magnetic resonance imaging
No full textWe propose a novel metamaterial-based device inserted in a magnetic resonance imaging (MRI) setup in order to enhance the MRI efficiency. More precisely, we show that a negative magnetic permeability metamaterial, coupled to a standard radio-frequency surface coil, allows to boost the magnetic resonance imaging signal to noise ratio with respect to the standard setup. We believe that the proposed setup holds great potential in MRI applications
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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