1,720,997 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
Streamlined Routes to Phenacyl Azides and 2,5-Diarylpyrazines Enabled by Deep Eutectic Solvents
No full textA Deep Eutectic Solvent like choline chloride/glycerol (1:2 mol mol–1) proved to be an effective, sustainable reaction medium to easily synthesize both phenacyl azides and symmetrical 2,5-diarylpyrazines of interest in pharmacology and in coordination chemistry. Notable features of our report include: (i) nucleophilic substitution reactions of α-halo carbonyl compounds to the corresponding phenacyl azides compatible with the eutectic mixture, (ii) the reduction of phenacyl azides to α-amino carbonyl compounds, which undergo spontaneous dimerisation/cyclisation/aromatisation in the same eutectic mixture to provide valuable pyrazines. Telescoped, one-pot, two-steps stoichiometric/catalytic processes have also been successfully developed to furnish 2,5-diarylpyrazines in up to 95 % yield
Lithiated oxazolinyloxiranes and oxazolinylaziridines: Key players in organic synthesis
No full textThis paper focuses on α-lithiated oxazolinyloxiranes and oxazolinylaziridines, their generation, reactions, and synthetic applications. The ability of the oxazoline ring in providing stabilization to such α-heterosubstituted carbanions either through electronic effects and coordinative action has been stressed as well as the contribution to the configurational stability or instability of such species. IR spectroscopic data, multinuclear NMR investigations, and ab initio calculations planned to get insights on chemical properties and structural features have been carried out. A number of new reactions including alkylations, addition reactions, hydroxyalkylations, cyclopropanations, lactonizations, and rearrangements have been discovered, giving access to a variety of substances including: aziridinolactones, epoxylactones, aryl alkanones, polysubstituted cyclopropanes, cyclopropanefused lactones, dihydro-oxazoloisoquinolines, diversely functionalized oxazolines, and products that can be derived from them by synthetic elaboration. © 2014 IUPAC & De Gruyter Berlin/Boston 2014
Efficient Regioselective Synthesis of 3,4,5-Trisubstituted 1,2,4-Triazoles on the Basis of a Lithiation-Trapping Sequence
No full textThe presence of an electron-donating methoxy group at the 4′-position of 4-phenyl-3,5-dimethyl-1,2,4-triazole is beneficial to lateral metalation/functionalization of this ring system once sBuLi is employed as the base and THF is used as the solvent at -78°C; this opens up an alternative approach towards the synthesis of several 1,2,4-triazole derivatives. Both carbon- and heteroatom-based halides are competent electrophiles for this transformation, as are aliphatic and aromatic aldehydes and ketones, isocyanates, carboxylic acid derivatives, and α,β-unsaturated carbonyl compounds. The easy elaboration of such a group to phenol derivatives also provides greater flexibility in synthetic design
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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