1,235 research outputs found
Interactivity: A review of the concept and a framework for analysis
The terms `interactivity' and `interactive media' became significant buzz-words during the late 1980s and early 1990s when the multi-media euphoria fascinated politicians, economists, and researchers alike. However, right from the beginning of the scientific debate, the inconsistent usage of the term `interactivity' massively complicated the comparability of numerous empirical studies. This is where this article joins the discussion. First, the article sheds light on the terminological origins of `interactivity' and distinguishes the term from cognate expressions. Further, it restructures and extends existing findings on the basis of a new analysis framework which considers three levels of interactive communication (action level, level of subjective situation evaluation, and level of meaning exchange). Finally, it delivers a systematic overview of specific criteria of interactive communication
The Pion-Cloud Contribution to the Electromagnetic Nucleon Form Factors
We study the electromagnetic structure of the nucleon within a hybrid
constituent-quark model that comprises, in addition to the valence
component, also a + non-valence component. To this aim we employ a
Poincar\'e-invariant multichannel formulation based on the point-form of
relativistic quantum mechanics. With a simple 3-quark wave function for the
bare nucleon, i.e. the -component, we obtain reasonable results for the
nucleon form factors and predict the meson-cloud contribution to be significant
only below \,GeV amounting to about 10\% for
, in accordance with the findings of other authors.Comment: Contribution presented by W. Schweiger at the 21st International
Conference on Few-Body Problems in Physics, Chicago IL, May 18-22, 2015; 4
pages, 2 figure
Hard exclusive photoproduction of charmed mesons
{We investigate the photoproduction process within the handbag approach, which we assume
to be the dominant mechanism at energies well above the production threshold
and in the forward scattering hemisphere.Comment: proceedings of Photon 2013, May 20-24 2013, Paris, Franc
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