1,400 research outputs found
Was the GLE on May 17, 2012 linked with the M5.1-class flare the first in the 24th solar cycle?
On May 17, 2012 an M5.1-class flare exploded from the sun. An O-type coronal
mass ejection (CME) was also associated with this flare. There was an instant
increase in proton flux with peak at MeV, leading to S2 solar
radiation storm level. In about 20 minutes after the X-ray emission, the solar
particles reached the Earth.It was the source of the first (since December
2006) ground level enhancement (GLE) of the current solar cycle 24. The GLE was
detected by neutron monitors (NM) and other ground based detectors. Here we
present an observation by the Tupi muon telescopes (Niteroi, Brazil, , , 3 m above sea level) of the enhancement of muons at ground
level associated with this M5.1-class solar flare. The Tupi telescopes
registered a muon excess over background in the 5-min binning time
profile. The Tupi signal is studied in correlation with data obtained by
space-borne detectors (GOES, ACE), ground based neutron monitors (Oulu) and air
shower detectors (the IceTop surface component of the IceCube neutrino
observatory). We also report the observation of the muon signal possibly
associated with the CME/sheath striking the Earth magnetosphere on May 20,
2012. We show that the observed temporal correlation of the muon excess
observed by the Tupi muon telescopes with solar transient events suggests a
real physical connection between them. Our observation indicates that
combination of two factors, the low energy threshold of the Tupi muon
telescopes and the location of the Tupi experiment in the South Atlantic
Anomaly region, can be favorable in the study and detection of the solar
transient events. Our experiment provides new data complementary to other
techniques (space and ground based) in the study of solar physics.Comment: 9 pages, 10 figure
Insulin-mediated increases in arterial baroreflex control of muscle sympathetic nerve activity following meal intake in humans [abstract]
Animal studies indicate that insulin enhances arterial baroreflex (ABR) control of sympathetic nerve activity (SNA); however, the extent to which these findings can be extrapolated to humans is unknown. To begin to address this, we utilized a mixed meal as a physiological method to evoke sustained increases in plasma insulin
Spatial distribution of two symmetric four-wave mixing signals induced by Gaussian beams
We present a theoretical analysis of the spatial shape of two symmetric
signals of degenerate four-wave mixing induced by Gaussian beams in a thin
sample of two-level atoms. Our calculations take into account the full spatial
and spectral dependencies of the relevant nonlinear susceptibilities that
govern the two processes. This reveals two interesting effects. The first one
is that the total power of incident beams affects the transverse profile of the
four-wave mixing signals at the medium exit and their free propagation. The
second one is the influence of the spectral characteristics of the medium on
the longitudinal profile of both generated signals upon free propagation. We
argue that the first effect can be seen as the saturation of the medium in
regions of higher intensity, while the second can be understood as the result
of a nonlinear contribution to the refractive index inside the atomic medium.
These effects can be symmetric between the two signals, with asymmetries
induced by different detunings from resonance of the incident fields
Expression, purification and analysis of the anti-HIV Cyanovirin-N produced in transgenic soybeans seeds.
Edição do Congress of the Brazilian Biotechnology Society, Florianópolis, 2013
Zoneamento agroclimático para cana-de-açúcar no continente africano.
O zoneamento agrícola da cana de açúcar tem como objetivo fornecer subsídios técnicos para formulação de políticas públicas à expansão e produção sustentável. Neste trabalho foi realizado o zoneamento de aptidão climática e pedológica para a cana-de-açúcar no continente africano, onde os principais indicadores considerados na elaboração foram a temperatura, a deficiência hídrica, a declividade e o tipo de solo. Foi possível identificar as áreas mais adequadas ao cultivo da cana-de-açúcar e as regiões onde há restrições para seu desenvolvimento. O presente trabalho teve como objetivo avaliar a aptidão climática e pedológica da cana de açúcar no continente africano.Trabalho apresentado na V Mostra de Trabalhos de Estagiários e Bolsistas, Campinas, out. 2009
A lei da inovação tecnológica na Embrapa Clima Temperado.
bitstream/item/33570/1/documento-155.pd
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