1,720,964 research outputs found
“The shadow of light: non-Lorentzian behavior of photon systems"
No full textWe discuss the theoretical foundations and the results of a double slit diffraction-like experiment in the infrared range, aimed at finding departures from the classical predictions. We found indeed an anomalous behavior of such a photon system. Possible interpretations can be given in terms of either the existence of de Broglie-Bohm hollow waves associated to photons, and/or a breakdown of local Lorentz invariance (LLI). The findings of the present experiment do agree with the threshold behavior in energy and space, recently derived (on an experimental basis) for the LLI breaking effect. This leads us to put forward the intriguing hypothesis that the hollow wave is a deformation of the space-time (Minkowskian) geometry. Our experimental findings have been tested in crossed photon-beam experiments, whose preliminary results evidence an anomalous behavior in the photon-photon cross section and confirm the threshold behavior in energy and space of the effect we observed. (C) 2004 Elsevier B.V. All rights reserved
Neutrons from piezonuclear reactions
No full textWe report the results obtained by cavitating water solutions
of iron salts (Fe(Cl)3 and Fe(NO3)3) with different concentrations
at different ultrasound powers. In all cases we detected a
neutron radiation well higher than the background level. The neutron
production is perfectly reproducible and can at some extent be controlled.
These evidences for neutron emission generated by cavitation
support some preliminary clues for the possibility of piezonuclear reactions
(namely nuclear reactions induced by pressure and shock waves)
obtained in the last ten years. We have been able for the first time to
state some basic features of such a neutron emission induced by cavitation,
namely: 1) a marked threshold behavior in power, energy and
time; 2) its apparent occurring without a concomitant production of
radiation
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
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