19,303 research outputs found
Potencial do resíduo da candeia (Eremanthus erythropappus) para a produção de biocarvão.
Resumo
On the nature of some SGRs and AXPs as rotation-powered neutron stars
We investigate the possibility that some SGRs/AXPs could be canonical
rotation-powered pulsars using realistic NS structure parameters instead of
fiducial values. We show that realistic NS parameters lowers the estimated
value of the magnetic field and radiation efficiency, ,
with respect to estimates based on fiducial NS parameters. We show that nine
SGRs/AXPs can be described as canonical pulsars driven by the NS rotational
energy, for computed in the soft (2--10~keV) X-ray band. We compute the
range of NS masses for which . We discuss the observed
hard X-ray emission in three sources of the group of nine potentially
rotation-powered NSs. This additional hard X-ray component dominates over the
soft one leading to in two of them. We show that 9
SGRs/AXPs can be rotation-powered NSs if we analyze their X-ray luminosity in
the soft 2--10~keV band. Interestingly, four of them show radio emission and
six have been associated with supernova remnants (including Swift J1834.9-0846
the first SGR observed with a surrounding wind nebula). These observations give
additional support to our results of a natural explanation of these sources in
terms of ordinary pulsars. Including the hard X-ray emission observed in three
sources of the group of potential rotation-powered NSs, this number of sources
with becomes seven. It remains open to verification
1) the accuracy of the estimated distances and 2) the possible contribution of
the associated supernova remnants to the hard X-ray emission.Comment: 11 pages, 14 figures, to appear in A&
Produção orgânica de uvas destinadas à elaboração de vinhos finos como diferencial mercado no Submédio do Vale do São Francisco.
bitstream/item/67957/1/Folder-Vinho-organico.pd
Epidemia de Zucchini lethal chlorosis virus (ZLCV) na cultura da melancia no Brasil Central.
As viroses estão entre as doenças que mais afetam as cucurbitáceas em todo o mundo, resultando em queda de produtividade e podendo limitar a produção. No ano de 2013, sintomas de mosaico, deformação foliar, paralisação do crescimento da planta, com reflexos significativos na produção foram observados em lavouras de melancia de municípios do Estado de Goiás.Resum
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