1,720,957 research outputs found
Quantum dynamical R-matrix from fusion
No full textA quantum dynamical R-matrix (QDRM) with three distinct eigenvalues, which is a trigonometric solution of the Gervais-Neven-Felder equation, is constructed from the fusion of the simplest 4 x 4 trigonometric QDRM of Hecke type for sl(2).Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)1ARTICLE1157-1603
QUANTUM MINKOWSKI SPACE AND GENERATORS OF QUANTUM LORENTZ GROUP
No full textFrom the basic 4 x 4 R matrix associated with the quantum Lorentz group SL(q)(2, C) and its various fusion matrices, the covariant differential calculus on the quantum Minkowski space and the R commutation relation for the covariant generators of quantum Lorentz group are presented.Physics, MultidisciplinarySCI(E)0ARTICLE2173-1802
The narrow Theta(5) pentaquark as the first non-planar hadron with the diamond structure and negative parity
No full textUsing the picture of the flux tube model, we propose that the Theta(5) pentaquark as the first candidate of the three-dimensional non-planar hadron with the extremely stable diamond structure. The up and down quarks lie at the corners of the diamond while the anti-strange quark sits in the center. Various un-excited color flux tubes between the five quarks bind them into a stable and narrow color-singlet. Such a configuration allows the lowest state having the negative parity naturally. The decay of the Theta(5) pentaquark into the nucleon and kaon requires the breakup of the non-planar diamond configuration into two conventional planar hadrons, which involves some kind of structural phase transition as in the condensed matter physics. Hence the width of the Theta(+) pentaquark should be narrow despite that it lies above the kaon nucleon threshold. We suggest that future lattice QCD calculation adopt non-planar interpolating currents to explore the underlying structure of the Theta(5) pentaquark.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000225632600007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, NuclearPhysics, Particles & FieldsPhysics, MathematicalSCI(E)10REVIEW372791-27971
REMARKS ON THE Q-DEFORMATION OF FERMIONIC OSCILLATORS
No full textThe properties of the q-deformed fermionic oscillator operators are examined. The difference between the deformed oscillators and the ordinary ones is closely related to the multivalueness of the deformation parameter eta = ln q.Physics, MultidisciplinarySCI(E)2ARTICLE2241-2441
NEW TYPE COVARIANT DIFFERENTIAL-CALCULUS ON THE QUANTUM PLANES
No full textWe find a series of new solutions to Wess-Zumino's consistency conditions for noncommutative differential calculus on the quantum planes. These solutions correspond to the quantum orthogonal planes and quantum symplectic planes. As a by-product, d2 = 0 is automatically satisfied in this construction.Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)1ARTICLE3323-3301
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
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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