1,722,587 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
“A density functional study of the interaction between zinc ion in metalloproteinases and substituted hydroxamic acids”
No full text“The effect of the nature of the metal center on the properties of metallacumulene complexes: a Density Functional study”
No full textSelective functionalization of the Si(100) surface by a bi-functional alkynilamine molecule: a density functional study of the switching adsorption linkage
No full textThe reaction of the bifunctional organic molecule 1-dimethylamino-2-propyne (DMAP) on the Si(100) surface has been investigated by density functional calculations on a one-dimer cluster model. We found that, once in the physisorbed dative bonded well (-22.1 kcal mol(-1)), DMAP can proceed to react via a number of pathways. We first considered the cycloaddition of the C equivalent to C triple bond, leading to Si-C di-sigma bonded product (-58.6 kcal mol(-1)), computing an energy barrier of 33.1 kcal mol(-1). We considered also possible dissociative pathways of dative bonded DMAP, i.e., methylene C-H, methyl C-H or N-CH3 bond cleavage
“Quantum chemistry study on the coordination of substituted hydroxamic acids with zinc ion in matrix metalloproteinases”
No full textA Density Functional Study on the Interaction of a Polycyclic Aromatic Molecule and the Silicon (001) Surface
No full textStatic and dynamical density functional theory calculations have been carried out to investigate the coordination and haptotropic rearrangement of the Cr(CO)(3) fragment on the (6,0) carbon nanotube sidewalls. Geometry optimizations have been performed on the Cr(CO)(3)-(C72H12) complex, pointing out the preferred coordination sites of the metal fragment on the nanotube sidewalls. We find a hole site configuration of the Cr(CO)(3) to be the global energy minimum of the Cr(CO)(3)-(C72H12) system, with a binding energy of 143 kJ mol(-1). The shifting of the Cr(CO)(3) complex between two coordination sites on adjacent hexagonal rings of (6,0) carbon nanotubes has been investigated by means of Car-Parrinello simulations, from which the transition state structure for the haptrotropic rearrangement has been localized and found to be 68 kJ mol(-1) above the global minimum structure
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