1,721,087 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
Theoretical prediction of hydrogen bond basicity
No full textAb initio and DFT calculations on around 50 hydrogen bond, or Lewis bases and their complexes with hydrogen fluoride are reported. A range of calculated properties of both free bases and complexes are correlated with β, an experimental scale of hydrogen bond basicity. For the entire range of bases, we find that none of the isolated base properties correlate well with β, although some family-dependent models can be constructed for O and N bases separately. In contrast, several properties of the HF complexes and changes on complexation correlate strongly with β, including the H-bond binding energy, changes in the electron density at bond critical points, and the lengthening and weakening of the H–F bond on H-bond formation. Using these models, new values of β are predicted for molecules and functional groups which have no experimentally measured counterparts, including carbenes, C-ylides, phosphines, and amine and phosphine oxides
Theoretical electron densities in transition metal dihydrides
No full textAnalysis of the DFT calculated electron density distributions of the first-row transition metal (TM) dihydrides are reported. Nickel dihydride was used to assess the effects of basis set and exchange-correlation functional on calculated density properties, leading to the conclusions that diffuse basis functions and gradient-corrected functionals accurately describe the essential features of NiH2. These calculations indicate a remarkably high degree of covalent character in the Ni-H bond, as measured by most density properties, although the Laplacian of the density and the electron localization function (ELF) apparently show 'closed-shell' interaction. Subsequent B3LYP/6-311++G(f,p) studies of the ground states of the 10 first-row TM dihydrides were performed, and similarities and trends across this series examined. The M-H bond becomes less polar and more covalent across the row, as expected on the basis of electronegativity. We go on to show that several simply calculated electron density properties, notably those at the M-H bond critical point, also recover this trend
Theoretical prediction of hydrogen bond donor capacity
No full textAb initio calculations on over fifty hydrogen bond donor molecules, and their complexes with a reference hydrogen bond acceptor, are reported. Properties calculated for the molecules and complexes are assessed for their ability to correlate and predict experimentally derived values of hydrogen bond donor capacity, α. Two such properties stand out as excellent predictors of α: both the electrostatic potential at the donor H nucleus and the hydrogen bond stabilization energy correlate α to close to the estimated experimental error. Several other calculated properties, including atomic charges and multipoles on the donor H, the extent of charge transfer from acceptor to donor, and topological properties of the electron density, are also correlated with α
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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