5,592 research outputs found
ASCA view on High-Redshift Radio-Quiet Quasars
We briefly discuss the latest ASCA results on the X-ray spectral properties
of high-redshift radio-quiet quasars.Comment: 4 pages, 1 figure, to appear in the Proceedings of the Conference
"X-ray Astronomy '999: Stellar Endpoints, AGNs, and the Diffuse X-ray
Background (September 6-10 - 1999
The Barthel index: italian translation, adaptation and validation
The Barthel Index (BI) is widely used to measure disability also in
Italy, although a validated and culturally adapted Italian version of
BI has not been produced yet. This article describes the translation
and cultural adaptation into Italian of the original 10-item version of
BI, and reports the procedures for testing its validity and reliability.
The cultural adaptation and validation process was based on data
from a cohort of disabled patients from two different Rehabilitation
Centers in Rome, Italy.
Forward and backward translation method was adopted by
qualified linguist and independent native English official translators.
The scale obtained was reviewed by 20 experts in psychometric
sciences. The Italian adapted version of the BI was then produced
and validated. A total number of 180 patients were submitted to the
adapted scale for testing its acceptability and internal consistency.
The total time of compilation was 5 ± 2,6 minutes (range 3-10).
Validation of the scale was performed by 7 trained professional
therapists that submitted both the translated and the adapted
versions to a group of 62 clinically stable patients (T-test=-2.051
p=0.05). The internal consistency by Cronbachâs alpha resulted
equal to 0.96. Test â retest intra â rater reliability was evaluated
on 35 cases; at test-retest was ICC=0.983 (95%IC: 0.967-0.992).
This is the first study that reports translation, adaptation and
validation of the BI in Italian language. It provides a new tool for
professionals to measure functional disability when appraising
Italian speaking disable patients in health and social care settings
along the continuum of care
Simbol-X Background Minimization: Mirror Spacecraft Passive Shielding Trade-Off Study
The present work shows a quantitative trade-off analysis of the Simbol-X
Mirror Spacecraft (MSC) passive shielding, in the phase space of the various
parameters: mass budget, dimension, geometry, and composition. A simplified
physical (and geometrical) model of the sky screen, implemented by means of a
GEANT4 simulation, has been developed to perform a performance-driven mass
optimization and evaluate the residual background level on Simbol-X focal
plane.Comment: 3 pages, 6 figures, to appear in the proceedings of the second
Simbol-X International Symposium "Simbol-X - Focusing on the Hard X-ray
Universe", AIP Conf. Proc. Series, P. Ferrando and J. Rodriguez ed
Towards an optical potential for rare-earths through coupled channels
The coupled-channel theory is a natural way of treating nonelastic channels,
in particular those arising from collective excitations, defined by nuclear
deformations. Proper treatment of such excitations is often essential to the
accurate description of reaction experimental data. Previous works have applied
different models to specific nuclei with the purpose of determining
angular-integrated cross sections. In this work, we present an extensive study
of the effects of collective couplings and nuclear deformations on integrated
cross sections as well as on angular distributions in a consistent manner for
neutron-induced reactions on nuclei in the rare-earth region. This specific
subset of the nuclide chart was chosen precisely because of a clear static
deformation pattern. We analyze the convergence of the coupled-channel
calculations regarding the number of states being explicitly coupled. Inspired
by the work done by Dietrich \emph{et al.}, a model for deforming the spherical
Koning-Delaroche optical potential as function of quadrupole and hexadecupole
deformations is also proposed. We demonstrate that the obtained results of
calculations for total, elastic and inelastic cross sections, as well as
elastic and inelastic angular distributions correspond to a remarkably good
agreement with experimental data for scattering energies above around a few
MeV.Comment: 7 pages, 6 figures. Submitted to the proceedings of the XXXVI
Reuni\~ao de Trabalho de F\'{\i}sica Nuclear no Brasil (XXXVI Brazilian
Workshop on Nuclear Physics), held in Maresias, S\~ao Paulo, Brazil in
September 2013, which should be published on AIP Conference Proceeding
Series. arXiv admin note: substantial text overlap with arXiv:1311.1115,
arXiv:1311.042
Boson Dominance in nuclei
We present a new method of bosonization of fermion systems applicable when
the partition function is dominated by composite bosons. Restricting the
partition function to such states we get an euclidean bosonic action from which
we derive the Hamiltonian. Such a procedure respects all the fermion
symmetries, in particular fermion number conservation, and provides a boson
mapping of all fermion operators.Comment: 12 page
- âŠ