125,710 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Diffraction and sigma(gamma*rho)
No full textSchildknecht D, Tentyukov M, Kuroda M, Surrow B. Diffraction and sigma(gamma*rho). ACTA PHYSICA POLONICA B. 2002;33(11):3431-3438.The empirical scaling law, wherein the total photo-absorption cross section depends on the single variable eta = (Q(2) + m(0)(2))/A(2)(W-2), provides em pirical evidence for saturation in the sense of sigma(gamma*p)(W-2, Q(2))/sigma(gammap)(W-2) --> 1 for W-2 --> infinity at fixed Q(2). The total photo-absorption cross section is related to elastic diffraction in terms of a sum rule. The excess of diffractive production over the elastic component is due to inelastic diffraction that contains the production of hadronic states of higher spins. Motivated by the diffractive mass spectrum, the Generalized Vector Dominance/Color Dipole Picture (GVD/CDP) is extended to successfully describe the DIS data in the full region of x 0, where the diffractive two-gluon exchange mechanism dominates
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Low-x scaling in gamma*p total cross sections
No full textSchildknecht D, Surrow B, Tentyukov M. Low-x scaling in gamma*p total cross sections. PHYSICS LETTERS B. 2001;499(1-2):116-124.We show that the experimental data for the total virtual-photon proton cross section, sigma gamma *p(W-2,Q(2)) for x(bj) less than or similar to 0.1 lie on a universal curve, when plotted against eta = (Q(2) + m(0)(2))/Lambda (2)(W-2), where Lambda (2)(W-2) = C-l(W-2 + W-0(2))(C2) is determined by the parameters C-1, C-2 and W-0(2) . The observed scaling law follows from the generalized-vector-dominance/colour-dipole picture (GVD/CDP) of low-x deep inelastic scattering. (C) 2001 Elsevier Science B.V. All rights reserved
Scaling in gamma*p total cross-sections, saturation and the gluon density
No full textSchildknecht D, Surrow B, Tentyukov M. Scaling in gamma*p total cross-sections, saturation and the gluon density. MODERN PHYSICS LETTERS A. 2001;16(28):1829-1839.Including the new HERA data, the gamma *p total cross-section is analyzed in the generalized vector dominance/color-dipole picture (GVD/CDP) that contains scaling in eta = (Q(2) + m(0)(2))/Lambda (2)(W-2), where Lambda (2)(W-2) is an increasing function of W-2. At any Q(2), for W-2 --> infinity, the cross-sections for virtual and real photons become identical, sigma (gamma *p)(W-2, Q(2))/(sigma gammap)(W-2) --> 1. The gluon density deduced from the color-dipole cross-section fulfills the leading order DGLAP relationship. Evolution a la DGLAP breaks down for n less than or similar to 0.1
Vector-meson electroproduction from generalized vector dominance
No full textSchildknecht D, Schuler GA, Surrow B. Vector-meson electroproduction from generalized vector dominance. PHYSICS LETTERS B. 1999;449(3-4):328-338.Including destructively interfering off-diagonal transitions of diffraction-dissociation type, we arl ive at a formulation of GVD for exclusive vector-meson production in terms of a continuous spectral representation of dipole form. The transverse cross-section, sigma(T.gamma*p) (-->) (Vp), behaves asymptotically as 1/Q(4), while R-v equivalent to sigma(L.gamma*p --> Vp)/sigma(T.gamma*p --> Vp) becomes asymptotically constant. Contributions violating s-channel helicity conservation stay at the level established in low-energy photoproduction and diffractive hadron-hadron interactions. The data on rho(0)-meson production from the Fermilab E665 Collaboration and on phi- and rho(0)-meson production from HERA are found to be in agreement with these predictions. (C) 1999 Elsevier Science B.V. All rights reserved
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Dr. Edwin Wright Collection: Author Unknown
No full textNotes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
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