1,721,048 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
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
Interaction of C-60 with Ge(111) in the 3 root 3X3 root R30 degrees phase: A (2X2) model
No full textThe adsorption of a close-packed C-60 Single layer on the clean c(2 x 8)-Ge(111) surface leads to the formation of a 3 root 3 x 3 root 3R30 degrees low-energy electron diffraction pattern upon annealing at 450-500 degrees C. We have investigated this phase using synchrotron-radiation photoemission. The Ge 3d core-level spectra show the quenching of the surface features related to the adatoms/rest-atoms complex of the original Ge(lll)-c(2 x 8) reconstruction, suggesting that the observed 3 root 3 x 3 root 3R30 degrees ordering is not due to a Ge(111) reconstruction induced by the C-60 adsorption, as instead previously argued on the basis of scanning tunneling microscopy measurements. Moreover, no filling of the lowest unoccupied molecular orbital derived bands has been observed. The C Is core level and the valence-band photoemission spectra point to the presence of a localized covalent bond between the C-60 molecules and the Ge atoms. This bond induces the splitting of the C-60 highest occupied molecular orbital with a feature appearing at about 2.3 eV
Ferromagnetic and ordered MnSi(111) epitaxial layers
No full textWe report a comprehensive study of ordered MnSi films grown on Si (111) which provides clear proofs that these MnSi films have the same magnetic and electronic properties of bulk MnSi compound, so closing a long-standing question. Furthermore, our measurements show the presence of a room-temperature ferromagnetic transition consistent with the ferromagnetic ground state predicted for Mn atoms with reduced coordination near surfaces and interfaces of silicon by recent calculations of Hortamani et al. [Phys. Rev. B 78, 104402 (2008)]. The possibility of growing layers on semiconductors which are ferromagnetic at room temperature RT is of paramount importance for nonvolatile memories and spintronic devices based on the injection of spin-polarized current from a ferromagnetic metal into a semiconductor. In this perspective MnSi films grown on Si substrates represent an interesting case study
The electronic structure of the 3 root 3 x 3 root 3R30 degrees-C-60/Ge(111) system as measured by angle-resolved photoemission
No full textWe have investigated the close packed 3 root 3 x 3 root 3R30 degrees-C-60 monolayer on the Ge(111) surface using synchrotron radiation photoemission. No filling of the lowest unoccupied molecular orbital (LUMO) derived bands has been observed. The C 1s core level and the valence band photoemission spectra point to the presence of a localized covalent bond between the C-60 molecules and the Ge atoms. This bond induces the splitting of the C-60 highest occupied molecular orbital (HOMO) with a new feature appearing at about 2.3 eV. The Ge 3d core level spectra show the quenching of the surface features related to the adatoms/rest atoms complex, suggesting that the observed 3 root 3 x 3 root 3R30 degrees ordering is not due to a Ge(111) reconstruction induced by the C-60 adsorption. (C) 2000 Elsevier Science B.V. All rights reserved
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