5,223 research outputs found
A delta Scuti distance to the Large Magellanic Cloud
We present results from a well studied delta Scuti star discovered in the
LMC. The absolute magnitude of the variable was determined from the PL relation
for Galactic delta Scuti stars and from the theoretical modeling of the
observed B,V,I light curves. The two methods give distance moduli for the LMC
of 18.46+-0.19 and 18.48+-0.15, respectively, for a consistent value of the
stellar reddening of E(B-V)=0.08+-0.02. We have also analyzed 24 delta Scuti
candidates discovered in the OGLE II survey of the LMC, and 7 variables
identified in the open cluster LW 55 and in the galaxy disk by Kaluzny et al.
(2003, 2006). We find that the LMC delta Scuti stars define a PL relation whose
slope is very similar to that defined by the Galactic delta Scuti variables,
and yield a distance modulus for the LMC of 18.50+-0.22 mag. We compare the
results obtained from the delta Scuti variables with those derived from the LMC
RR Lyrae stars and Cepheids. Within the observational uncertainties, the three
groups of pulsating stars yield very similar distance moduli. These moduli are
all consistent with the "long" astronomical distance scale for the Large
Magellanic Cloud.Comment: Accepted for publication on A
Wetting of gradient fields: pathwise estimates
We consider the wetting transition in the framework of an effective interface
model of gradient type, in dimension 2 and higher. We prove pathwise estimates
showing that the interface is localized in the whole thermodynamically-defined
partial wetting regime considered in earlier works. Moreover, we study how the
interface delocalizes as the wetting transition is approached. Our main tool is
reflection positivity in the form of the chessboard estimate.Comment: Some typos removed after proofreading. Version to be published in
PTR
Shape Consistent 2D Keypoint Estimation under Domain Shift
Recent unsupervised domain adaptation methods based on deep architectures
have shown remarkable performance not only in traditional classification tasks
but also in more complex problems involving structured predictions (e.g.
semantic segmentation, depth estimation). Following this trend, in this paper
we present a novel deep adaptation framework for estimating keypoints under
domain shift}, i.e. when the training (source) and the test (target) images
significantly differ in terms of visual appearance. Our method seamlessly
combines three different components: feature alignment, adversarial training
and self-supervision. Specifically, our deep architecture leverages from
domain-specific distribution alignment layers to perform target adaptation at
the feature level. Furthermore, a novel loss is proposed which combines an
adversarial term for ensuring aligned predictions in the output space and a
geometric consistency term which guarantees coherent predictions between a
target sample and its perturbed version. Our extensive experimental evaluation
conducted on three publicly available benchmarks shows that our approach
outperforms state-of-the-art domain adaptation methods in the 2D keypoint
prediction task
Brca germline mutations in prostate cancer: The future is tailored
: Prostate cancer (PCa) is the second most common neoplasm in men and the fifth leading cause of death worldwide [...]
Second Overtone Pulsators Among Delta Scuti Stars
We investigate the modal stability of stellar models at masses and luminosity
levels corresponding to post main sequence luminous delta scuti pulsators. The
envelope models have been computed at fixed mass value, luminosity level and
chemical composition (Y=0.28, Z=0.02). According to a nonlinear approach to
radial oscillations the present investigation predicts the occurrence of stable
second overtone pulsators for the first time. The shape of both light and
velocity curves are presented and discussed, providing a useful tool for the
identification of second overtone pulsators among the known groups of radially
pulsating stars. The period ratios of mixed mode pulsators obtained by
perturbing the first and the second overtone radial eigenfunctions are in
agreement with observative values. Finally, the physical structure and the
dynamical properties of second overtone pulsators are discussed in detail. The
role played by the nodal lines in the destabilization of second overtone
pulsators is also pointed out.Comment: 20 pages, 11 Postscript figures, uses aaspp4.sty and tighten.st
Juventudes y espacio público : las demandas de la Juventud Campesina de ASAGRAPA y Estudiantil de la FENAES en el Paraguay
Durante el año 2007, seis paÃses sudamericanos se unieron para llevar a cabo una inusual y desafiante investigación regional Juventud e Integración Sudamericana: caracterización de situaciones tipo y organizaciones juveniles. En Paraguay, la investigación fue coordinada por BASE Investigaciones Sociales, que formó parte de una red de investigación con otras siete instituciones de la región, bajo la supervisión general de Instituto Brasileño de Análisis Sociales y Económicos, IBASE y el Instituto de Estudios y AsesorÃa en PolÃticas Sociales, POLIS, ambos de Brasil, con el apoyo de la agencia del parlamento canadiense, International Development Research Center (IDRC). El conjunto de estas investigaciones sobre juventudes sudamericanas tiene varias improntas, que lo presentan como un emprendimiento innovador en este campo en las ciencias sociales de la región
High frequency polarization switching of a thin ferroelectric film
We consider both experimentally and analytically the transient oscillatory
process that arises when a rapid change in voltage is applied to a
ferroelectric thin film deposited on an substrate.
High frequency () polarization oscillations are observed
in the ferroelectric sample. These can be understood using a simple
field-polarization model. In particular we obtain analytic expressions for the
oscillation frequency and the decay time of the polarization fluctuation in
terms of the material parameters. These estimations agree well with the
experimental results
Visual perception and dissociation during Mirror Gazing Test in patients with anorexia nervosa : a preliminary study
Purpose: It has been widely shown that dissociative features might play a fundamental role in producing body image distortions in patients affected by eating disorders. Here, we hypothesize that the Mirror Gazing Test (MGT), a task consisting in mirror exposure in a condition of sensory deprivation, would elicit dissociative symptoms in a group of patients with anorexia nervosa (AN). Methods: Fourteen patients with AN and fourteen healthy controls (HC) underwent a 10 min MGT and completed the Strange Face Questionnaire and a short version of the Clinician-Administered Dissociative States Scale, along with a psychological assessment for eating disorders psychopathology, anxiety and depression. Results: AN patients reported a higher number of strange-face apparitions and dissociative sensations than HC during the MGT. Dissociative identity (compartmentalization of two or more identities) and depersonalization (detachment of bodily-self) were much higher in patients with AN than in HC. These findings were correlated with body dissatisfaction and disruption in interoceptive awareness. Conclusion: Dissociation and body image dysfunction are strongly connected in the pathophysiology of anorexia nervosa. Future research should investigate the same aspects in other psychiatric conditions characterized by body image distortions, such as Body Dysmorphic Disorder. Level of evidence: I, Experimental studies
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