56,410 research outputs found
E3D, The Euro3D Visualization Tool I: Description of the program and its capabilities
We present the first version of E3D, the Euro3D visualization tool for data
from integral field spectroscopy. We describe its major characteristics, based
on the proposed requirements, the current state of the project, and some
planned future upgrades. We show examples of its use and capabilities.Comment: 4 pages, 6 figures, accepted for publishing in AN (ref.proc. of
Euro3D Science workshop, IoA Cambridge, May 2003
Neutrino-nucleus interactions in the T2K experiment
We present a study of neutrino-nucleus interactions at the T2K experiment
based on the GiBUU transport model. The aim of T2K is to measure
appearance and , but it will also be able to do a precise
measurement of disappearance. The former requires a good
understanding of production while the latter is closely connected with
a good understanding of quasielastic scattering. For both processes we
investigate the influence of nuclear effects and particular final-state
interactions on the expected event rates taking into account the T2K detector
setup.Comment: v3: matches version to be published in Phys. Rev.
Conflicts in Development: Tourism and the Cattle Industry in Brazil
This paper challenges the conventional view that where there is a political elite, economic development will proceed along lines that sacrifice future generations for the benefit of the current ruling class. We find that shortfalls in the balance of payments will cause those in authority to promote activities that encourage tourism as a solution to balance of payments deficit. The vehicle for generating tourism is the provision of public goods. More traditional paths toward development particularly cattle ranching are displaced by tourist attractions. While motivated by myopic self-interest, the pursuit of public goods reduces the amount of debt transferred to future generations and thereby serves to redistribute wealth inter-temporally. Brazil over the period 1965 until 1998 is used as a test case.tourism, cattle, ecotourism, public goods
A Model for Dark Matter Halos
A halo model is presented which possesses a constant phase space density (Q)
core followed by a radial CDM-like power law decrease in Q. The motivation for
the core is the allowance for a possible primordial phase space density limit
such as the Tremaine-Gunn upper bound. The space density profile derived from
this model has a constant density core and falls off rapidly beyond. The new
model is shown to improve the fits to the observations of LSB galaxy rotation
curves, naturally provides a model which has been shown to result in a
lengthened dynamical friction time scale for the Fornax dwarf spheroidal galaxy
and predicts a flattening of the density profile within the Einstein radius of
galaxy clusters. A constant gas entropy floor is predicted whose adiabatic
constant provides a lower limit in accord with observed galaxy cluster values.
While `observable-sized' cores are not seen in standard cold dark matter (CDM)
simulations, phase space considerations suggest that they could appear in warm
dark matter (WDM) cosmological simulations and in certain hierarchically
consistent SuperWIMP scenarios.Comment: 14 pages, 3 figures, accepted for publication in Ap
Light-related variation in sapling architecture of three shade-tolerant tree species of the Mexican rain forest
The crown architecture of three shade-tolerant tree species (two subcanopy and one mid-canopy) was analyzed in relation to the light regime of the forest understorey. The aim was to examine to which extent shade-tolerant species variate in their crown architecture. Tree saplings (265) between 50 and 300 cm height, and distributed from understorey to variously-sized canopy gaps, were measured for 13 architectural traits in the lowland rain forest of Los Tuxtlas, Mexico. The analysis showed that the three species changed their architecture as light increased but in a different way. No species conformed to the typical wide-crown type expected for shade-tolerant species, and in contrast they presented some traits of light demanding species. The two sub-canopy species tended to adopt a crown form between a narrow- and wide-crown type, and the mid-canopy species showed more traits of a narrow-crown type. The horizontal crown area appeared as the more related trait to the light and sapling height. It is concluded that despite being shade-tolerant, the Studied species make use of better-lit environments in the forest understorey. The crown architecture of shade-tolerant species is not Lis rigid Lis originally conceived
- âŠ