2,698 research outputs found
Produção de mudas de espécies lenhosas.
Planejamento das instalações para produção de mudas; Técnicas de produção de mudas.bitstream/CNPF-2009-09/43217/1/doc130.pd
Meridional rank of whitehead doubles
We prove that the meridional rank and the bridge number of the Whitehead
double of a prime algebraically tame knot coincide. Algebraically tame knots
are a broad generalization of torus knots and iterated cable knots.Comment: 29 pages, 28 figure
Introdução de Grevillea robusta in vitro.
EVINCI. Resumo 006
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Deriving global flood hazard maps of fluvial floods through a physical model cascade
Global flood hazard maps can be used in the assessment
of flood risk in a number of different applications,
including (re)insurance and large scale flood preparedness.
Such global hazard maps can be generated using large scale
physically based models of rainfall-runoff and river routing,
when used in conjunction with a number of post-processing
methods. In this study, the European Centre for Medium
Range Weather Forecasts (ECMWF) land surface model is
coupled to ERA-Interim reanalysis meteorological forcing
data, and resultant runoff is passed to a river routing algorithm
which simulates floodplains and flood flow across the
global land area. The global hazard map is based on a 30 yr
(1979–2010) simulation period. A Gumbel distribution is fitted
to the annual maxima flows to derive a number of flood
return periods. The return periods are calculated initially for
a 25×25 km grid, which is then reprojected onto a 1×1 km
grid to derive maps of higher resolution and estimate flooded
fractional area for the individual 25×25 km cells. Several
global and regional maps of flood return periods ranging
from 2 to 500 yr are presented. The results compare reasonably
to a benchmark data set of global flood hazard. The developed
methodology can be applied to other datasets on a
global or regional scale
Miniaturização da análise de açúcares livres em tecido foliar pelo método de fenol-ácido sulfúrico.
Resumo
Fine structure of the age-chromospheric activity relation in solar-type stars I: The Ca II infrared triplet: Absolute flux calibration
Strong spectral lines are useful indicators of stellar chromospheric
activity. They are physically linked to the convection efficiency, differential
rotation, and angular momentum evolution and are a potential indicator of age.
However, for ages > 2 Gyr, the age-activity relationship remains poorly
constrained thus hampering its full application. The Ca II infrared triplet
(IRT lines) has been poorly studied compared to classical chromospheric
indicators. We report in this paper absolute chromospheric fluxes in the three
Ca II IRT lines, based on a new calibration tied to up-to-date model
atmospheres. We obtain the Ca II IRT absolute fluxes for 113 FGK stars from
high signal-to-noise ratio and high-resolution spectra covering an extensive
domain of chromospheric activity levels. We perform an absolute continuum flux
calibration for the Ca II IRT lines anchored in atmospheric models calculated
as an explicit function of effective temperatures, metallicity, and gravities
avoiding the degeneracy present in photometric continuum calibrations based
solely on color indices. The internal uncertainties achieved for continuum
absolute flux calculations are 2\% of the solar chromospheric flux, one order
of magnitude lower than photometric calibrations. We gauge the impact of
observational errors on the final chromospheric fluxes due to the absolute
continuum flux calibration and find that uncertainties are
properly mitigated by the photospheric correction leaving [Fe/H] as the
dominating factor in the chromospheric flux uncertainty. Across the FGK
spectral types, the Ca II IRT lines are sensitive to chromospheric activity.
The reduced internal uncertainties reported here enable us to build a new
chromospheric absolute flux scale and explore the age-activity relation from
the active regime down to very low activity levels and a wide range of , mass, [Fe/H], and age.Comment: 12 pages, 12 figures, 6 tables, Accepted for publication on A&A.
Abstract edited to comply with arXiv standards regarding the number of
character
Desinfestação de erva-mate in vitro.
EVINCI. Resumo 016
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