1,720,963 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
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
Structural and Magnetic Properties of MnxB100-x Alloys
No full textMnxB100-x alloys (x = 30-60) were fabricated by arc melting technique. Structural analysis showed that alloy with Mn55B45 atomic composition has a single-phase orthorhombic FeB-type MnB structure. As-synthesized alloy has a saturation magnetization of 130 emu/g at 300 K, which is the largest value previously reported. Saturation magnetization increases rapidly from 3.5 to 130 emu/g as x increases from 30 to 55. Further increase of the x causes the reduction of the saturation magnetization to 50 emu/g. Magnetic properties of the MnB alloy have been also evaluated by first-principles density functional theory calculations. Electronic structure calculations were performed using full potential linearized augmented plane wave method and a spin polarized generalized gradient approximation. A 1.914 mu(B) magnetization per MnB unit was calculated, which corresponds to 158 emu/g at 0 K. Curie temperature (T-C) of the Mn55B45 was measured as 566 K which is in good agreement with the values reported for MnB alloy
Effective magnetic anisotropy enhancement of FePt nanocrystals through shape control
No full textMagnetic properties of spherical, cubic, star and rod shaped FePt nanostructures have been investigated. Field dependence of magnetization measurements showed that approach to saturation magnetization behavior of the samples is shape dependent. When compared to spherical nanoparticles, eightfold magnetic field has to be applied to saturate nanorods. The effective magnetic anisotropies were determined by using temperature dependence of magnetization experiments and Stoner-Wohlfarth theory. The key result of the work is that engineering on the shape of the nanostructures leads to significant increase of their effective magnetic anisotropy. Cubic nanoparticles were found to have the lowest and nanorods the highest effective magnetic anisotropy constant of 1.3 x 10(5) Jm(-3) and 2.7 x 10(5) Jm(-3), respectively. The physical origin of this difference was ascribed to the high shape anisotropy of the rod shaped nanostructures combined with the low magnetocrysralline anisotropy of fcc FePt. By evaluating rod-shaped nanocrystals as prolate spheroids, their shape anisotropy was calculated as 1.0 x 10(5) Jm(-3), which is in very good agreement with the experimental result. (C) 2013 Elsevier B.V. All rights reserved
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
Influence of Crystal Size on the Magnetic Properties of Manganese Monoboride Nanoparticles
No full textThis paper reports the preparation of manganese monoboride (Mn50B50) nanocrystals by high-energy dry milling of as-cast bulk ingots. The ingot was fabricated by using an arc-melting technique. The as-made sample exhibits an orthorhombic structure with a saturation magnetization of 130 emu/g and a magnetic transition at 566 K. The effects of milling conditions on the structural and magnetic properties of Mn50B50 were investigated in detail. Fully stoichiometric Mn50B50 nanocrystals were produced with an average crystal size ranging from 23 to 11 nm after 2-7 h of dry milling. The as-milled MnB nanocrystals were found to exhibit soft magnetic behavior at room temperature with near-zero coercivity; saturation magnetization decreased to 85 emu/g with increased milling time because of a disordered spin configuration on the surface. High-saturation magnetization and chemical stability, and a low-cost manufacturing process make nanocrystal Mn50B50 a promising candidate for technological applications such as magnetic hyperthermia, magnetic data storage, and magnetic imaging
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
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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