1,726,123 research outputs found
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
Role of the interfacial state: a comparison of Co/Al2O3/NiFe and La0.7Ca0.3MnO3/Al2O3/La0.7Ca0.3MnO3 tunnel junctions
No full textTwo junctions of Co/Al2O3/NiFe (J(1)) and La0.7Ca0.3MnO3/Al2O3/La0.7Ca0.3MnO3 (J(2)) were prepared to compare their tunneling magnetoresistance (TMR) in consideration of interfacial state effects. The structural and transport properties of the layered samples were characterized by X-ray and magnetic measurements, showing indeed an interfacial state dependence. The influences such as from a CoO sublayer in J(1) and from interfacial coherence in J(2) were discussed. The largest TMR observed amounts to 16% (290 K) for J(1) and 65% (40 K) for J(2). (C) 2002 Elsevier Science B.V. All rights reserved
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
Exploring lattice effects on transport properties in La0.7Sr0.3MnO3/Al2O3 superlattices
No full textSuperlattice modulation and interfacial dilatation in manganite/alumina multilayers were used to explore lattice effects on transport behaviour. Epitaxial growth and high quality of stacking as well as structural coherency were confirmed by x-ray measurements. As the measure of lattice distortion, the average lattice spacing, structural coherency length, Curie temperature, magnetization, coercive field H-c as well as resistance are found to be functions of the interface fraction. Accordingly, we divided each manganite layer into two parts, i.e., weakly distorted 'innermost' atomic layers and strongly dilated interfacial atomic layers, as is well clarified by observation of two component magnetization loops and huge variation in resistance measured with current in and perpendicular to plane (i.e. CIP and CPP). The low-resistive innermost part with a 'bulk'-like soft magnetic behaviour functions as a conductance channel for the CIP case, whereas the high-resistive interfacial part rules the CPP data, leading to a low-magnetotunnelling effect at 4.2 K and an enhanced colossal magnetoresistance at the relevant transition temperature
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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