1,721,157 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
Unravelling the mechanism of the organocatalyzed aminolytic kinetic resolution of α-nitroepoxides: A theoretical study
No full textThe aminolytic kinetic resolution of 2-methyl-2-nitro-3-phenyl oxirane with aniline was investigated by quantum chemical computations. It has been assessed that the reaction proceeds via a concerted ring opening/elimination of nitrous acid mechanism. The results are in agreement with the experimental findings when using the Takemoto's catalyst, which is estimated to perform in a highly efficient manner in the kinetic resolution of this class of epoxides in the absence of any background reaction. H-Bonding, π-π and CH/π interactions appear to make a significant contribution to the formation of a ternary complex and a transition state, which preferentially facilitates the reaction of the (2R,3S)-nitroepoxide to the α-amino ketone, leaving (2S,3R)-nitroepoxide unreacted
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
Coherent Effects in Charge Transport in Molecular Wires: Toward a Unifying Picture of Long-Range Hole Transfer in DNA
No full textIn the framework of a multistep mechanism in which environmental motion triggers comparatively faster elementary electron-transfer steps and stabilizes hole-transfer products, microscopic coherence is crucial for rationalizing the observed yield ratios of oxidative damage to DNA. Interference among probability amplitudes of indistinguishable electron-transfer paths is able to drastically change the final outcome of charge transport, even in DNA oligomers constituted by similar building blocks, and allows for reconciling apparently discordant experimental observations. Properly tailored DNA oligomers appear to be a promising workbench for studying tunneling in the presence of dissipation at the macroscopic level
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
Applicazione del rilevamento geomatico alla Domus della regina d'Inghilterra a Pompei (VII, 14, 5): risultati preliminari
Full text linkThis work arises from the collaboration between the Laboratory of Archaeological Research Methodologies and the Laboratory of Geomatics of the University of Genoa, based on a multidisciplinary approach, combining archaeological and engineering skills. Since 2016, the team of archaeologists from the University of Genoa has been working inside the Pompeii Archaeological Park in the shops of insula 14 of Regio VII, an important area within the urban context as it overlooks Via dell'Abbondanza, the most important road, and it is located in a central position, in proximity to the main public areas, such as the Forum. From the beginning of the project to the present day, the archaeology team has analysed the tabernae from a stratigraphic point of view. So, simultaneously with the excavation activity, a stratigraphic analysis of the walls and coatings was carried out, involving both the commercial establishments being excavated and the three large houses of the insula, mainly focusing on the most western one, named Casa della Regina d'Inghilterra. In September 2020, a survey campaign was carried out by geomatics engineers aiming to applying innovative survey methodologies to the architectural complex of the entire insula and, specifically, to the Casa della Regina d'Inghilterra. In particular, the survey data were collected by total station, GNSS, laser scanner, combined with terrestrial and UAV photogrammetry. This paper presents the preliminary results obtained from the geomatic survey campaign, leading to the creation of an accurate photogrammetric model which can be used as a basis for a reconstructive model, whose hypotheses will be confirmed or denied by a future structural 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
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