1,721,618 research outputs found
Critical behavior of the dilute antiferromagnet in a magnetic field
Get PDF© 2011 American Physical Society. We thank N.G. Fytas for his comments on our manuscript. Our simulations were performed on the Red Española de Supercomputación and at BIFI (Terminus and Piregrid). We acknowledge partial financial support from MICINN, Spain (Contract No. FIS2009-12648-C03) and from UCM-Banco de Santander (GR32/10-A/910383). D.Y. was supported by the FPU program (Spain).We study the critical behavior of the diluted antiferromagnet in a field with the tethered Monte Carlo formalism. We compute the critical exponents (including the elusive hyperscaling violations exponent θ). Our results provide a comprehensive description of the phase transition and clarify the inconsistencies between previous experimental and theoretical work. To do so, our method addresses the usual problems of numerical work (large tunneling barriers and self-averaging violations).Ministerio de Ciencia e Innovación (MICINN)UCM-Banco de SantanderFPU program (Spain)Depto. de Física TeóricaFac. de Ciencias FísicasTRUEpu
Three-dimensional Heisenberg spin glass under a weak random anisotropy
Get PDF© 2011 American Physical Society. We thank A. Tarancón, G. Parisi, and P. Young for discussions. Simulations were performed at BIFI (Terminus, 6.6 × 10^(5) hours of CPU time) and Red Española de Supercomputación (Caesaraugusta, 2.79 × 10^(5) hours), whose staff we thank for the assistance provided. We were partly supported by MICINN (Spain) through research contract No. FIS2009-12648-C03 and (S.P.G.) through the FECYT Foundation.We perform a finite-size scaling study of the three-dimensional Heisenberg spin glass in the presence of weak random anisotropic interactions, up to lattice sizes L = 32. Anisotropies have a major impact on the phase transition. The chiral-glass susceptibility does not diverge due to a large anomalous dimension. It follows that the anisotropic spin glass belongs to a Universality Class different from the isotropic model, which questions the applicability of the chirality scenario.Ministerio de Ciencia e Innovación (MICINN)FECYT FoundationDepto. de Física TeóricaFac. de Ciencias FísicasTRUEpu
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
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
Correspondence between long-range and short-range spin glasses
Get PDF© 2012 American Physical Society. We thank G. Parisi and M. Moore for discussions. A.P.Y. acknowledges support from the NSF through Grant No. DMR- 0906366 and a generous allocation of computer time from the Hierarchical Systems Research Foundation. The shortrange simulations, and part of the long-range simulations, were carried out on ARAGRID and BIFI computers. R.A.B., L.A.F., and V.M.M. acknowledge partial financial support from MICINN, Spain, Contract No. FIS2009 12648-C03. R.A.B. was also supported by the FPI Program (Diputación de Aragón, Spain). V.M.M. acknowledges the hospitality of the Physics Department of UCSC (visit funded by the Del Amo Foundation), where part of this work was performed.We compare the critical behavior of the short-range Ising spin glass with a spin glass with long-range interactions which fall off as a power σ of the distance. We show that there is a value of σ of the long-range model for which the critical behavior is very similar to that of the short range model in four dimensions. We also study a value of σ for which we find the critical behavior to be compatible with that of the three-dimensional model, although we have much less precision than in the four-dimensional case.Ministerio de Ciencia e Innovación (MICINN)NSFFPI Program (Diputación de Aragón, Spain)Depto. de Física TeóricaFac. de Ciencias FísicasTRUEpu
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