305,549 research outputs found
A Vector meson dominance approach to scale invariance
No full textA model of scale invariance for both deep inelastic scattering and e+e- annihilation incorporating an infinite number of vector mesons is proposed. Structure functions are calculated explicitly in good agreement with experiments. Precocious scaling arises naturally in the model
An extended vector dominance model: its implications on meson decays and e+e- annihilation into hadrons.
No full textLes conséquences de l'existence des nouveaux vecteurs mésons sont discutées. On étudie les désintégrations ω,φ → 3 π, ω, φ → π0γ, π0, η, η' → γγ, η, η'→ π+ π- γ en tenant compte des contributions des ρ'(mρ'≈ 1,5GeV, Γρ'≈0,350 GeV) et de ses partenaires de SU(3). Cela permet d'estimer le couplage du photon ρ' et des constantes de couplage des différents multiplets SU(3). Les sections efficaces de la production des hadrons dans les collisions e+ e- sont étudiées et l'on prédit leur grandeur et leur comportement à des énergies totales dans le centre de masse de 1,4 à 2,4 GeV.The consequences of the existence of new vector mesons are discussed. The decays ω,φ → 3 π, ω, φ → π0γ, π0, η, η' → γγ, π, π'→ π+ π- γ are studied taking into account the contributions of the ρ'(mρ'≈ 1,5GeV, Γρ'≈0,350 GeV) and its SU(3) partners. This allows an estimate of the ρ'-photon coupling and the coupling constants among the different SU(3) multiplets involved in the model. The cross sections for production of hadrons in e+ e+ collisions are then studied, and their magnitude and behaviour are predicted at total energies of the colliding beams, 2 E ranging from 1.4 to 2.4 GeV
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
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
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
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