1,720,991 research outputs found
Muon Capture on Light Nuclei
No full textThis work investigates the muon capture reactions (2)H(mu (-), nu (mu) )nn and (3)He(mu (-), nu (mu) )(3)H and the contribution to their total capture rates arising from the axial two-body currents obtained imposing the partially-conserved-axial-current (PCAC) hypothesis. The initial and final A = 2 and 3 nuclear wave functions are obtained from the Argonne v (18) two-nucleon potential, in combination with the Urbana IX three-nucleon potential in the case of A = 3. The weak current consists of vector and axial components derived in chiral effective field theory. The low-energy constant entering the vector (axial) component is determined by reproducting the isovector combination of the trinucleon magnetic moment (Gamow-Teller matrix element of tritium beta-decay). The total capture rates are 393.1(8) s(-1) for A = 2 and 1488(9) s(-1) for A = 3, where the uncertainties arise from the adopted fitting procedure
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Benchmark calculations of infinite neutron matter with realistic two- and three-nucleon potentials
Get PDFWe present the equation of state of infinite neutron matter as obtained from
highly-realistic Hamiltonians that include nucleon-nucleon and three-nucleon
coordinate-space potentials. We benchmark three independent many-body methods:
Brueckner-Bethe-Goldstone (BBG), Fermi hypernetted chain/single-operator chain
(FHNC/SOC), and auxiliary-field diffusion Monte Carlo (AFDMC). We find them to
provide similar equations of state when the Argonne and the Argonne
nucleon-nucleon potentials are used in combination with the
Urbana IX three-body force. Only at densities larger than about 1.5 the nuclear
saturation density () the FHNC/SOC energies are
appreciably lower than the other two approaches. The AFDMC calculations carried
out with all of the Norfolk potentials fitted to reproduce the experimental
trinucleon ground-state energies and doublet scattering length yield
unphysically bound neutron matter, associated with the formation of neutron
droplets. Including tritium -decay in the fitting procedure, as in the
second family of Norfolk potentials, mitigates but does not completely resolve
this problem. An excellent agreement between the BBG and AFDMC results is found
for the subset of Norfolk interactions that do not make neutron-matter
collapse, while the FHNC/SOC equations of state are moderately softer.Comment: 15 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1908.0442
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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