1,721,055 research outputs found
Electromagnetic properties of hadrons in a chiral constituent-quark model
No full textthe electromagnetic form factors of the nucleon are calculated in a constituent quark model where the quark interaction is mediated by Goldstone-boson exchang
Multi-scattering effects in (e,e'p) knockout
No full textfinal-state interactions in one-nucleon knockout by an electromagnetic probe are described in terms of multi-step interactions between the ejected nucleon and the nucleons of the residual nucleu
Semi-relativistic charge-current density operator
No full textthe charge-current operator entering the electromagnetic interaction with an atomic nucleus is derived from a semirelativistic Hamiltonia
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
Semirelativistic approach to current operator and its applications
No full textthe electromagnetic charge-current density operator consistent with a single-particle semi-relativistic Hamiltonian is derived and applied to electron scattering off nucle
Multiscattering effects in (e,e'N)
No full textMultistep direct scattering of the ejectile proton is considered in (e,e'N) reactions in the quasi-free region as an improvement over the usual treatment of final-state interactions by means of an optical potential. Important contributions of two- and three-step processes including charge-exchange reactions are found at high missing energy and momentum
Charge-exchange and multi-scattering effects in (e,e′n) knockout
No full textthe neutron knockout in (e,e'n) reactions is described in terms of a two-step process, i.e. (e,e'p) followed by a charge-exchange (p,n) reactio
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