1,720,989 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
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Measurement of Neutral Pions and Direct Photons in Cu + Cu Collisions at 62.4 GeV Center of Mass Energy
Full text linkDirect-photons measured with the PHENIX detector at RHIC, in Au+Au collisions, have been found to scale with the number of binary (nucleon-nucleon) collisions at large transverse momenta. In contrast, earlier measurements from RHIC, using charged and neutral hadron spectra, showed a clear suppression with respect to pp collisions. That suppression was interpreted to be due to the energy loss of scattered partons in the produced dense medium in heavy-ion collisions. Thus, it is concluded that such an energy loss is not evident for direct-photons. In order to understand the turn-on of these effects, similar measurements have been subsequently made for Cu+Cu collisions at various collision energies. This work will present a new measurement of direct photons in Cu+Cu collisions at = 62.4 GeV. The smaller system size may provide new insight into the system size dependence of photon production. These data will be compared to pp collision data, as well as neutral pion spectra from the same collision data, to check for modification of particle production due to effects of the system created in the heavy ion collisions
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Measurement of the Transverse Single Spin Asymmetry and the Invariant Cross Section of Inclusive Eta Mesons Produced from Transversely Polarized Proton-Proton Collisions at Center of Mass Energy of 200 GeV.
Full text linkThe measurement of transverse single spin asymmetries provides insight into the structure of the nucleon. Originally expected to be small, results from PHENIX and other experiments show significant asymmetries in the forward momentum direction of the polarized proton over a wide range of center-of-mass energies. Several mechanisms have been proposed that attempt to explain these asymmetries, which include initial and final state effects based on transverse momentum dependent distributions and perturbative Quantum Chromodynamic (pQCD) calculations at higher twist. Studying the species, and the kinematic dependencies of these transverse single spin asymmetries will help to disentangle the origin of the observed asymmetries. Using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC), the transverse single spin asymmetry (A_N) of inclusive eta mesons produced from transversely polarized proton-proton collisions at center of mass energy of 200~GeV at forward rapidity is measured. In addition, the predictive power of pQCD to explain this asymmetry is tested via the measurement of the eta meson Cross Section
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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Transverse Single-Spin Asymmetry for Diffractive Electromagnetic Jets at Forward Rapidity using p↑+ p Collisions at √s= 200 and 510 GeV at STAR
Full text linkTransverse single-spin asymmetry, denoted as AN, is the azimuthal asymmetry for the final-state productions with respect to the polarized beam direction and the momentum direction. In polarized proton-proton collision, the AN is considered a powerful observable in proton spin structure studies. Initially, the AN is predicted to be small. However,more experiments show the unexpectedly large AN in proton-proton collisions, which raises great interest in understanding the origin of the large AN. Recent studies indicates that the large AN might originate from diffractive events, which motivates this study to explore the AN for the diffractive events in polarized proton-proton collisions and to investigate their contributions to the large AN observed in the inclusive events.The Relativistic Heavy Ion Collider (RHIC) is the only collider capable of providing polarized proton beams. The Solenoidal Tracker at RHIC (STAR) experiment takes advantage of RHIC and provides ideal opportunities to study the AN for the diffractive events. Two transversely polarized proton-proton collision datasets taken in 2015 and 2017, with the center-of-mass energies of 200 GeV and 510 GeV, respectively, are used for this study.In this dissertation, the AN for the electromagnetic jets (EM-jets) in single diffractive events, rapidity gap events, and semi-exclusive events is studied. The AN for single diffractive events and rapidity gap events is explored as a function of Feynman-x (xF) and as a function of photon multiplicity (the number of photons inside the EM-jet) for the two datasets. It shows the AN for the single diffractive events and the rapidity gap events are consistent with the AN for the inclusive events within uncertainty. The fraction of the cross-section in the single diffractive events to the inclusive events is studied. These provide essential information on the contributions for the AN in the single diffractive events to the large AN observed in the inclusive events. The AN for the semi-exclusive events is also studied for the 200 GeV dataset. These interesting results provide evidence to understand the origin of the large AN
Probing the Spin Structure of the Proton Using Polarized Proton-Proton Collisions and the Production of W Bosons
Full text linkThis thesis discusses the process of extracting the longitudinal asymmetry, , describing production in forward kinematic regimes. This asymmetry is used to constrain our understanding of the polarized parton distribution functions characterizing and sea quarks in the proton. This asymmetry will be used to constrain the overall contribution of the sea-quarks to the total proton spin. The asymmetry is evaluated over the pseudorapidity range of the PHENIX Muon Arms, , for longitudinally polarized proton-proton collisions at 510 GeV . In particular, I will discuss the statistical methods used to characterize real muonic decays and the various background processes is presented, including a discussion of likelihood event selection and the Extended Unbinned Maximum Likelihood fit. These statistical methods serve estimate the yields of muonic decays, which are used to calculate the longitudinal asymmetry
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