13,205 research outputs found
Vibrating soap films: An analog for quantum chaos on billiards
We present an experimental setup based on the normal modes of vibrating soap
films which shows quantum features of integrable and chaotic billiards. In
particular, we obtain the so-called scars -narrow linear regions with high
probability along classical periodic orbits- for the classically chaotic
billiards. We show that these scars are also visible at low frequencies.
Finally, we suggest some applications of our experimental setup in other
related two-dimensional wave phenomena.Comment: 5 pages, 7 figures. Better Postscript figures available on reques
Spectral distortions from promising single and multifield inflationary models
Forthcoming missions probing the absolute intensity of the CMB are expected
to be able to measure spectral distortions, which are deviations from its
blackbody distribution. As cosmic inflation can induce spectral distortions,
these experiments offer a possibility to further test the various promising
inflationary proposals, whose predictions need to be carefully determined.
After numerically fitting all inflationary observables to match current
observations, we compute the predicted spectral distortions of various
promising single and multifield inflationary models. The predictions of
single-field inflationary models display deviations between 1% and 20% with
respect to the standard cosmological model in the observable window, where
multi-natural and axion-monodromy inflation stand out in this respect. In the
case of multifield inflation, we observe a richer structure of the power
spectrum, which, in the case of so-called hybrid attractors, yields spectral
distortions about 100 times more intense than the standard signal. These
observations open up questions about the relation among our results and other
cosmological observables that are also to be probed soon.Comment: 30 pages + references, 17 figures, 6 table
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Facilitating Creativity in Collaborative Work with Computational Intelligence Software
The use of computational intelligence for leveraging social creativity is a relatively new approach that allows organizations to find creative solutions to complex problems in which the interaction between stakeholders is crucial. The creative solutions that come from joint thinking-from the combined knowledge and abilities of people with diverse perspectives-contrast with traditional views of creativity that focus primarily on the individual as the main contributor of creativity. In an effort to support social creativity in organizations, in this paper we present computational intelligence software tools for that aim and an architecture for creating software mashups based on the concept of affinity space. The affinity space defines a digital setting to facilitate specific scenarios in collaborative business environments. The solution presented includes a set of free and open source software tools ranging from newly developed brainstorming applications to an expertise recommender for enhancing social creativity in the enterprise. The current paper addresses software design issues and presents reflections on the research work undertaken in the COLLAGE project between 2012 and 2015
Inherently safer design and optimization of intensified separation processes for furfural production
Faecal shedding of campylobacteria among domestic and wild animals from an urban coastal area
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