1,721,295 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
Computer aided design for sustainable industrial processes: specific tools and applications
No full textRole of Anion in Determining the Stereoselectivity of Mg-Ph-BOX-Catalyzed Diels-Alder Reactions: A Computational Study
No full textIn the realm of enantioselective Diels-Alder reactions, a role of primary importance is held by Mg-BOX catalysis. The main features of both catalysts and ligand in directing the stereoselective outcome have been extensively studied in several papers mainly through 1H NMR and X-ray diffraction (XRD) techniques. However, over the years, no computational studies have been reported to support the models proposed to rationalize the observed stereoselectivity for the reaction between 3-acryloyl-1,3-oxazolidin-2-one and cyclopentadiene catalyzed by the BOX ligand (R,R)-(+)-2,2′-isopropylidenebis(4-phenyl-2-oxazoline) and Mg(II) salts. To approach the problem, we performed a density functional theory (DFT) computational study, aiming to locate the preferred transitions states deriving from these proposed models, but we only found a correspondence in selectivities for the reaction catalyzed by Mg(OTf)2, where the model suggests an octahedral complex with the two triflate anions coordinating magnesium. For the other cases [i.e., Mg(ClO4)2, Mg(ClO4)2·2H2O, and MgI2·I2], the commonly accepted tetrahedral or octahedral models suggest no involvement of the perchlorate or iodide anions, but the corresponding calculations did not reproduce the experimental selectivities. Only when we considered also in these cases coordination complexes involving their presence, the observed selectivities were reproduced, thus opening new insights to better understand the role and the action of the counterion to determine the stereochemical outcome of these reactions
Isolation of a new caryophyllane ester from Lactarius subumbonatus: conformational analysis and absolute configuration
No full textCAPE OPEN Modules for the process sustainability prediction framework-description and applications
No full textVariations 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 CAPE OPEN Unit Operation for the Evaluation of Environmental Impact of a Chemical Process
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