1,721,027 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
Short-term dichloroacetate treatment improves indices of cerebral metabolism in patients with mitochondrial disorders
No full textWe performed a short-term, double-blind, placebo-controlled, crossover trial of sodium dichloroacetate (DCA) therapy in 11 patients affected by various primary mitochondrial disorders. Independent measures of oxidative metabolism (venous blood metabolites, exercise testing, phosphorus magnetic resonance [MR] spectroscopy of muscle, and proton MR spectroscopy of brain) were used in order to monitor metabolic responses to the drug. One week of DCA treatment produced significant decreases (p < 0.05) in blood lactate, pyruvate, and alanine at rest and after bicycle exercise. Proton MR spectra collected from a supraventricular volume of interest in brain of seven of 11 patients also showed significant changes. Brain lactate/creatine ratio decreased by 42% during DCA treatment (p < 0.05). Brain choline/creatine ratio (which is low in patients with myelinopathies) increased by 18% (p < 0.01) after therapy. N-Acetylaspartate/creatine ratio (an index of neuronal damage or loss) increased by 8% after treatment (p < 0.05). Proton MR spectra collected in two of 11 patients from a volume of interest including the basal ganglia showed similar results (decrease of 36.6% in lactate/creatine; increases of 16% in choline/creatine and 4.5% in N-acetylaspartate/creatine). Phosphorus MR spectroscopy of muscle and self-assessed clinical disability were unchanged. Our study indicates that short-term DCA treatment not only lowers blood lactate but also improves indices of both brain oxidative metabolism and neuronal and glial density or function
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
Synthesis and structures of bismuth(III) complexes involving thio- and seleno-ether ligands
No full textBismuth trihalides (BiX3, X = Cl, Br or I) reacted with a range of thio- and seleno-ether ligands L-L in anhydrous MeCN solution to yield compounds with either a 1 : 1, 1 : 2 or 2 : 1 Bi : L-L ratio. Structural studies on [BiBr3{MeE(CH2)(3)EMe}] (E = S or Se) and [BiCl3{MeSe(CH2)(3)SeMe}] revealed that all of these species adopt an infinite two-dimensional sheet array derived from planar Bi2X6 units linked by bridging dithio- or diseleno-ether ligands which occupy mutually trans co-ordination sites, giving a distorted octahedral geometry at Bi-III. The structure of [BiBr3{MeS(CH2)(2)SMe}(2)] reveals a discrete molecular compound which adopts a 7-co-ordinate distorted pentagonal bipyramidal geometry involving two chelating MeS(CH2)(2)SMe ligands. This arrangement is also found for the iodide analogue. Reaction of BiBr3 with the Ph-substituted ligand PhS(CH2)(2)SPh generated a very different structural arrangement in which chains of almost mutually orthogonal Bi2Br2 'rectangles' are crosslinked by bridging dithioether ligands to yield infinite sheets of formula [Bi2Br6{PhS(CH2)(2)SPh}]. With the tripodal ligands L-3 (MeC(CH2SMe)(3) or MeC(CH2SeMe)(3)) compounds of stoichiometry [BiX3(L-3)] were obtained. The crystal structure of [BiCl3{MeC(CH2SeMe)(3)}] shows Bi2Cl6 subunits linked by bridging selenoether ligands to give a two-dimensional sheet. Each selenoether tripod functions as a bidentate chelate to Bi and bridges to an adjacent Bi via the third Se-donor, giving a distorted octahedral geometry at Bi-III. Although a rather poor quality structure, [Bi2I6{MeC(CH2SeMe)(3)}(2)] is not isostructural with its chloro analogue, but shows discrete dimers formed via Bi2I6 subunits, with each Bi also co-ordinated to a bidentate Se tripod and two terminal I ligands. The third Se-donor on each ligand remains non-co-ordinating. The influence of the Bi-based lone pair on the structures adopted by these complexes is discussed
Synthesis and structures of one-dimensional co-ordination polymers derived from bismuth(III) selenoether macrocyclic complexes
No full textTreatment of BiX3 (X=Cl or Br) with [8]aneSe(2) (1,5-diselenacyclooctane), [16]aneSe(4) (1,5,9,13-tetraselenacyclohexadecane), [24]aneSe(6) (1,5,9,13,17,21-hexaselenacyclotetracosane) yielded species of formula [BiX3(L)] in moderate to high yield as intensely coloured powdered solids. The crystal structures of [BiCl3([8]aneSe(2))] and [BiBr3([16]aneSe(4))] each reveal infinite one-dimensional ladder structures derived from almost planar Bi2X6 dimer units linked by mu-bridging cyclic selenoethers. Each Bi is co-ordinated to a Se2X4 donor set, with the Se donor atoms occupying mutually trans co-ordination sites. The selenoether ligands adopt exocyclic arrangements and, in [BiBr3([16]aneSe(4))], it is two trans Se atoms which co-ordinate to Bi-III, leaving the other two Se atoms non-co-ordinating. The structures of these species are contrasted with related complexes involving acyclic selenoether ligands and with the few structurally characterised bismuth(III) halide complexes with macrocyclic thioether ligands
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