1,721,261 research outputs found
Bose_Einstein correlations in charged-current muon-neutrino interactions in the NOMAD experiment at CERN
No full textA more sensitive search for νμ→ντ oscillations in NOMAD
No full textWith additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for vμ → vτ oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to identify vτ charged current interactions followed by decay of the τ- to one of several decay modes. Our "blind" analyses of deep-inelastic scattering data taken in 1996 and 1997, combined with consistent reanalyses of previously reported 1995 data, yield no oscillation signal. For the two-family oscillation scenario, we present the contour outlining a 90% C.L. confidence region in the sin22θμτ-Δm2plane. At large Δm2, the confidence region includes sin22θμτ <1.2 × 10-3 (a limit 3.5 times more stringent than in our previous publication), while at sin22θμτ = 1, the confidence region includes Δm2 < 1.2 eV2/c4. © 1999 Published by Elsevier Science B.V. All rights reserved
A more sensitive search for neutrino(muon) to neutrino(tau) oscillations in NOMAD
No full textWith additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for nu(mu) to nu(tau)
oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to
identify charged current interactions followed by decay of the tau to one of several decay modes. Our ‘‘blind’’ analyses
of deep-inelastic scattering data taken in 1996 and 1997, combined with consistent reanalyses of previously reported 1995
data, yield no oscillation signal. For the two-family oscillation scenario, we present the contour outlining a 90% C.L.
confidence region in the oscillation parameters 3.5 times more stringent than in our previous publication
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
Prediction of neutrino fluxes in the NOMAD experiment
No full textThe method developed for the calculation of the flux and composition of the West Area Neutrino Beam used by
NOMAD in its search for neutrino oscillations is described. The calculation is based on particle production rates
computed using a recent version of FLUKA and modified to take into account the cross-sections measured by the SPY
and NA20 experiments. These particles are propagated through the beam line taking into account the material and
magnetic fields they traverse. The neutrinos produced through their decays are tracked to the NOMAD detector. The
fluxes of the four neutrino flavours at NOMAD are predicted with an uncertainty of about 8% for nm and ne; 10% for
%nm; and 12% for %ne: The energy-dependent uncertainty achieved on the ne=nm prediction needed for a nm-ne oscillation
search ranges from 4% to 7%, whereas the overall normalization uncertainty on this ratio is 4.2%
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
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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