منابع مشابه
Signalling with a cryptic trait: the regularity of barred plumage in common waxbills
Sexual signals often compromise camouflage because of their conspicuousness. Pigmentation patterns, on the contrary, aid in camouflage. It was hypothesized that a particular type of pattern-barred plumage in birds, whereby pigmented bars extend across feathers-could simultaneously signal individual quality, because disruptions of these patterns should be perceptually salient at close range and ...
متن کاملModel-based pattern speed estimates for 38 barred galaxies
We have modelled 38 barred galaxies by using near-IR and optical data from the Ohio State University Bright Spiral Galaxy Survey. We constructed the gravitational potentials of the galaxies from H-band photometry, assuming constant mass-to-light ratio. The halo component we chose corresponds to the so called universal rotation curve. In each case, we used the response of gaseous and stellar par...
متن کاملMultiple pattern speeds in barred galaxies I. Two-dimensional models
We have studied the coexistence of several modes with different pattern speeds in barred galaxies, by a simulation survey exploring a wide range of initial conditions. The high resolution two-dimensional experiments cover the dynamical evolution for about one Hubble time. A remarkable feature of these simulations is that in many cases the spiral structure is clearly visible in the stellar compo...
متن کاملBarred Galaxies
Theoretical studies suggest that large-scale stellar bars can be highly effective in delivering gas to the central few hundred parsecs of a spiral galaxy, which may then initiate rapid star formation. Further instabilities may lead to additional inflow to physical scales relevant for active galactic nuclei. We test these predictions in light of recent observations. Compared to unbarred spirals,...
متن کاملThe Hamburg Metaphor Database
This article presents the Hamburg Metaphor Database project, an online database of French and German metaphors which came into being in 2002. In this database, metaphors appearing in different domain-specific corpora collected from mass media are available. The metaphors are annotated with lexical and conceptual information according to standard resources of the field: the EuroWordNet database ...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1959
ISSN: 0032-5791
DOI: 10.3382/ps.0380224