1,721,279 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
Antihyperhelium-4: First Evidence at the LHC
No full textTPb-Pb collision data taken by ALICE during 2018 at a centre-of-mass energy per nucleon pair of 5.02 TeV. The selection of (anti)hypernuclei exploits the displaced decay vertex topology of the particles originating from weak decays. Signals of antihyperhydrogen-4 (a bound of an antiproton, two antineutrons, and a ¯Λ) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a ¯Λ) are selected with a machine learning technique, which provides a significant improvement in the discrimination between signal and background compared to standard selection techniques. Antihyperhydrogen-4 is reconstructed through its charged mesonic two-body decay into an (anti)4He and a charged pion, while antihyperhelium-4 is reconstructed via its charged mesonic three-body decay into an (anti)3He, an (anti)proton, and a charged pion. The illustration shows the constituents of antihyperhelium-4
Examining the nucleosynthesis process and the inner nuclei structure with (anti)hypernuclei with ALICE at the LHC
No full textHypernuclei are bound states of nucleons and hyperons. The measurement of the production of hypernuclei with mass number A=3 and 4 in heavy-ion colli- sions is a powerful tool to investigate the mechanism of the nucleosynthesis. In the coalescence model, the production yields are sensitive to the interplay be- tween the spatial extension of the nucleus wavefunction and the baryon-emitting source size, whereas, in the statistical hadronization model, the nuclear struc- ture does not come into play in the production. Hypernuclei span over a wide range of wavefunction radii, from about 2 fm for A=4 hypernuclei to about 10 fm for the hypertriton, making them ideal probes to test such models. In addi- tion, the study of hypernuclei properties provides information on the nucleon- hyperon interactions, complementing the results obtained through femtoscopy correlation measurements. The strength of such interactions is a fundamen- tal input to calculate the equation-of-state of the high-density nuclear matter found inside neutron stars. This contribution presents recent measurements of the production and properties of 3ΛH, 4ΛH, and 4ΛHe based on the data samples collected by ALICE during the LHC Run 2 and Run 3. The measurement of A=4 (anti)hypernuclei using the LHC Run 2 data enabled also for the first evidence of the 4ΛHe. By comparing the yield measurements of these objects to the state-of-the-art production models, the production mechanisms can be investigated and by obtaining the properties such as their binding energy and lifetime, inputs to the equation-of-state can be delivered.
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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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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