24,549 research outputs found
Predicting recessions and recoveries in real time: The euro area-wide leading indicator (ALI)
This study develops a new monthly euro Area‐wide Leading Indicator (ALI) for the euro area business cycle. It derives the composite ALI by applying a deviation cycle methodology with a one‐sided band pass filter and choosing nine leading series. Our main findings are that i) the applied monthly reference business cycle indicator (BCI) derived from industrial production excluding construction is close to identical to the real GDP cycle, ii) the ALI reliably leads the BCI by 6 months and iii) the longer leading components of the ALI are good predictors of the ALI and therefore the BCI up to almost a year ahead and satisfactory predictors by up to 2 years ahead. A real‐time analysis for predicting the euro business cycle during the 2008/2009 recession and following recovery confirms these findings. JEL Classification: E32business cycle, Deviation cycle, euro area, Leading Indicator, Real‐time analysis
The reward value of infant facial cuteness tracks within-subject changes in women’s salivary testosterone
“Baby schema” refers to infant characteristics, such as facial cues, that
positively influence cuteness perceptions and trigger caregiving and protective
behaviors in adults. Current models of hormonal regulation of parenting
behaviors address how hormones may modulate protective behaviors and
nurturance, but not how hormones may modulate responses to infant
cuteness. To explore this issue, we investigated possible relationships
between the reward value of infant facial cuteness and within-woman changes
in testosterone, estradiol, and progesterone levels. Multilevel modeling of
these data showed that infant cuteness was more rewarding when women’s
salivary testosterone levels were high. Moreover, this within-woman effect of
testosterone was independent of the possible effects of estradiol and
progesterone and was not simply a consequence of changes in women’s
cuteness perceptions. These results suggest that testosterone may modulate
differential responses to infant facial cuteness, potentially revealing a new
route through which testosterone shapes selective allocation of parental
resources
Spectroscopic signature of Alfv\'en waves damping in a polar coronal hole up to 0.4 solar radii
Between February 24-25, 2009, the EIS spectrometer onboard the Hinode
spacecraft performed special "sit & stare" observations above the South polar
coronal hole continuously over more than 22 hours. Spectra were acquired with
the 1" slit placed off-limb covering altitudes up to 0.48 R
( Mm) above the Sun surface, in order to study with EIS the
non-thermal spectral line broadenings. Spectral lines such as Fe {\sc xii}
186.88, Fe {\sc xii} 193.51, Fe {\sc xii} 195.12 and
Fe {\sc xiii} 202.04 are observed with good statistics up to high
altitudes and they have been analyzed in this study. Results show that the FWHM
of Fe {\sc xii} 195.12 line increases up to R,
then decreases higher up. EIS stray light has been estimated and removed.
Derived electron density and non-thermal velocity profiles have been used to
estimate the total energy flux transported by Alfv\'en waves off-limb in polar
coronal hole up to R. The computed Alfv\'en wave energy
flux density progressively decays with altitude from erg cm s at 0.03 R down to erg cm s at 0.4 R, with an average energy
decay rate erg cm
s. Hence, this result suggests energy deposition by Alfv\'en waves in a
polar coronal hole, thus providing a significant source for coronal heating.Comment: Physical units of the Alfv\'en wave Energy Decay Rate revised with respect to the published version. Scientific results
and conclusions unchange
Comparative Measurements of Inverse Spin Hall and Magnetoresistance in YIG|Pt and YIG|Ta
We report on a comparative study of spin Hall related effects and
magnetoresistance in YIG|Pt and YIG|Ta bilayers. These combined measurements
allow to estimate the characteristic transport parameters of both Pt and Ta
layers juxtaposed to YIG: the spin mixing conductance
at the YIGnormal metal interface, the spin Hall angle , and the
spin diffusion length in the normal metal. The inverse spin Hall
voltages generated in Pt and Ta by the pure spin current pumped from YIG
excited at resonance confirm the opposite signs of spin Hall angles in these
two materials. Moreover, from the dependence of the inverse spin Hall voltage
on the Ta thickness, we extract the spin diffusion length in Ta, found to be
nm. Both the YIG|Pt and YIG|Ta systems
display a similar variation of resistance upon magnetic field orientation,
which can be explained in the recently developed framework of spin Hall
magnetoresistance.Comment: 8 pages, 5 figures, 1 tabl
Chern-Simons theory and the quantum Racah formula
We generalize several results on Chern-Simons models on Sigma x S1 in the
so-called "torus gauge" which were obtained in arXiv:math-ph/0507040 to the
case of general (simply-connected simple compact) structure groups and general
link colorings. In particular, we give a non-perturbative evaluation of the
Wilson loop observables corresponding to a special class of simple but
non-trivial links and show that their values are given by Turaev's shadow
invariant. As a byproduct we obtain a heuristic path integral derivation of the
quantum Racah formula
O projeto ético-político do serviço social: elementos históricos
TCC (graduação) - Universidade Federal de Santa Catarina, Centro Sócio Econômico, Curso de Serviço Social
Neutrino Oscillation Experiments at Nuclear Reactors
In this paper I give an overview of the status of neutrino oscillation
experiments performed using nuclear reactors as sources of neutrinos. I review
the present generation of experiments (Chooz and Palo Verde) with baselines of
about 1 km as well as the next generation that will search for oscillations
with a baseline of about 100 km. While the present detectors provide essential
input towards the understanding of the atmospheric neutrino anomaly, in the
future, the KamLAND reactor experiment represents our best opportunity to study
very small mass neutrino mixing in laboratory conditions. In addition KamLAND
with its very large fiducial mass and low energy threshold, will also be
sensitive to a broad range of different physics.Comment: 10 pages, 5 figures To appear in the proceedings of WIN99, Cape Town,
South Africa, Jan9
Detection of the microwave spin pumping using the inverse spin Hall effect
We report electrical detection of the dynamical part of the spin pumping
current emitted during ferromagnetic resonance (FMR) using the inverse Spin
Hall Effect (ISHE). The experiment is performed on a YIGPt bilayer. The
choice of YIG, a magnetic insulator, ensures that no charge current flows
between the two layers and only pure spin current produced by the magnetization
dynamics are transferred into the adjacent strong spin-orbit Pt layer via spin
pumping. To avoid measuring the parasitic eddy currents induced at the
frequency of the microwave source, a resonance at half the frequency is induced
using parametric excitation in the parallel geometry. Triggering this nonlinear
effect allows to directly detect on a spectrum analyzer the microwave component
of the ISHE voltage. Signals as large as 30 V are measured for precession
angles of a couple of degrees. This direct detection provides a novel efficient
means to study magnetization dynamics on a very wide frequency range with great
sensitivity
Electroweak corrections to three-jet production in electron-positron annihilation
We compute the electroweak corrections to
three-jet production and related event-shape observables at electron-positron
colliders. We properly account for the experimental photon isolation criteria
and for the corrections to the total hadronic cross section. Corrections to the
three-jet rate and to normalised event-shape distributions turn out to be at
the few-per-cent level.Comment: 5 pages, 4 figures. v2: changed normalisation in Fig. 2, minor text
revisions, version to appear in Phys.Lett.
Electroweak corrections to production at hadron colliders
In this paper we present the results from a calculation of the full
electroweak one-loop corrections for vector-boson pair production at
hadron colliders. The cases of proton--antiproton as well as proton--proton
collisions, at the Tevatron and the LHC, respectively, are considered. Results
are presented for the distribution of the invariant mass and for the
transverse momentum of the final-state photon. The higher-order electroweak
effects are numerically significant, in particular for probing possible
anomalous gauge-boson couplings
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