10,449 research outputs found
Extended Definition of Capacity in Airport Systems
Nowadays the main airports throughout the world are suffering because their capacity are getting close to saturation
due to the air traffic which is still increasing besides the economic crisis and oil prices. In addition, the forecasts
predict an increase in air traffic of at least 3.6% until 2020. This situation makes very important to come up with
solutions to alleviate capacity congestions in the main airports throughout the world. Capacity has been perceived
traditionally as the factor to be addressed in airport systems and it is faced through a technical perspective. In this
paper we propose to change the mind-set and view capacity of airport systems taking other factors than pure
technical ones. The discussion is illustrated with the example of Schiphol Airport
Astrophysical Configurations with Background Cosmology: Probing Dark Energy at Astrophysical Scales
We explore the effects of a positive cosmological constant on astrophysical
and cosmological configurations described by a polytropic equation of state. We
derive the conditions for equilibrium and stability of such configurations and
consider some astrophysical examples where our analysis may be relevant. We
show that in the presence of the cosmological constant the isothermal sphere is
not a viable astrophysical model since the density in this model does not go
asymptotically to zero. The cosmological constant implies that, for polytropic
index smaller than five, the central density has to exceed a certain minimal
value in terms of the vacuum density in order to guarantee the existence of a
finite size object. We examine such configurations together with effects of
in other exotic possibilities, such as neutrino and boson stars, and
we compare our results to N-body simulations. The astrophysical properties and
configurations found in this article are specific features resulting from the
existence of a dark energy component. Hence, if found in nature would be an
independent probe of a cosmological constant, complementary to other
observations.Comment: 23 pages, 11 figures, 2 tables. Reference added. Mon. Not. Roy.
Astro. Soc in prin
Kounis Syndrome Associated With Selective Anaphylaxis to Cefazolin.
info:eu-repo/semantics/publishedVersio
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