1,721,307 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
Search for the lepton-flavour violating decays and \boldmath
No full textA search for the lepton-flavour violating decays and is presented, using data collected by the LHCb experiment at the LHC in collisions, corresponding to an integrated luminosity of . No significant excess is observed and upper limits are set, constituting the world's most stringent limits to date. The reported limit on the decay is the first being set. In addition, exclusion limits are presented for scalar and left-handed lepton-flavour violating New Physics scenarios
Search for the lepton-flavour violating decays and at LHCb
No full textThe Standard Model of particle physics represents the most comprehensive and successful theory to date that describes the behaviour of elementary particles and their interactions at the smallest scales. However, experimental observations of phenomena that are not included the Standard Model indicate its incompleteness and motivate searches for physics beyond its predictions. The conservation of lepton flavour in interactions involving charged leptons is one feature of the Standard Model, but arises accidentally rather than through a fundamental basis of the theory. Lepton-flavour violating decays are thus sensitive probes for new heavy particles, and several new physics models have been proposed that would allow such transitions. This thesis presents a search for the lepton-flavour violating decays and in proton-proton collision data collected by the LHCb experiment at the Large Hadron Collider at centre-of-mass energies of (2011), (2012), and (2015-2018), corresponding to a total integrated luminosity of . It constitutes the first search for these decay modes at LHCb and studies the largest collected meson dataset in the world. The data are selected using kinematic properties of the final-state particles and particle identification criteria, with a particular focus on the strong suppression of background processes. Selection efficiencies are evaluated on samples of simulated signal decays, which are calibrated using data-driven methods. The signal branching fractions are determined relative to the high-yield resonant decays and . Signal candidates are assessed on data using an unbinned maximum-likelihood method. To avoid experimenters' bias, all selections and methods were finalised without examining the data in the mass regions around the potential signal distributions. No significant excesses are observed and upper limits on the branching fractions are determined for a uniform phase-space signal decay model, resulting in\begin{align*}{\cal B}(B^0 \to K^{*0}\mu^+ e^-) &< \phantom{1}5.7\times 10^{-9}~(6.9\times 10^{-9}),\\{\cal B}(B^0 \to K^{*0}\mu^- e^+) &< \phantom{1}6.8\times 10^{-9}~(7.9\times 10^{-9}),\\{\cal B}(B^0 \to K^{*0}\mu^\pm e^\mp) &< 10.1\times 10^{-9}~(11.7\times 10^{-9}),\\{\cal B}(B_s^0 \to \phi\mu^\pm e^\mp) &< 16.0\times 10^{-9}~(19.8\times 10^{-9})\end{align*}at () confidence level. The results constitute the world's most stringent limits to date. The limit on the decay is the first being set. In addition, exclusion limits are reported for a left-handed and a scalar new physics scenario. Furthermore, the thesis presents the author's contributions to the commissioning of the new scintillating fibre (SciFi) tracking detector for the LHCb Upgrade I experiment
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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