836 research outputs found
Sobre el carácter histórico del "Cantar de mio Cid"
En este número no se incluyeron resúmenes ni palabras clave.
"Mesturar" y la semántica hispano-árabe
En este número no se incluyeron resúmenes ni palabras clave
Dos observaciones sintáctico-estilísticas a las "Coplas" de Manrique
En este número no se incluyeron resúmenes ni palabras clave
Adición a "Soy quien soy"
En este número no se incluyeron resúmenes ni palabras clave.
Sobre la cántica "Eya velar"
En este número no se incluyeron resúmenes ni palabras clave
SONY Li Ion 18650HC Cell PTC, CID, Operation in a Very Large-Scale Parallel String Configuration
No abstract availabl
Evolution of Blister-Type HII Regions in a Magnetized Medium
We use the three-dimensional Athena ionizing radiation-magnetohydrodynamics
(IRMHD) code to simulate blister-type HII regions driven by stars on the edge
of magnetized gas clouds. We compare these to simulations of spherical HII
regions where the star is embedded deep within a cloud, and to non-magnetized
simulations of both types, in order to compare their ability to drive
turbulence and influence star formation. We find that magnetized blister HII
regions can be very efficient at injecting energy into clouds. This is partly a
magnetic effect: the magnetic energy added to a cloud by an HII region is
comparable to or larger than the kinetic energy, and magnetic fields can also
help collimate the ejected gas, increasing its energy yield. As a result of
these effects, a blister HII region expanding into a cloud with a magnetic
field perpendicular to its edge injects twice as much energy by 5 Myr as a
non-magnetized blister HII region driven by a star of the same luminosity.
Blister HII regions are also more efficient at injecting kinetic energy than
spherical HII regions, due to the recoil provided by escaping gas, but not by
as much as predicted by some analytic approximations.Comment: 15 pages, 17 figures, 1 tabl
The Milky Way's dark matter halo appears to be lopsided
The atomic hydrogen gas (HI) disk in the outer region (beyond ~10 kpc from
the centre) of Milky Way can provide valuable information about the structure
of the dark matter halo. The recent 3-D thickness map of the outer HI disk from
the all sky 21-cm line LAB survey, gives us a unique opportunity to investigate
the structure of the dark matter halo of Milky Way in great detail. A striking
feature of this new survey is the North-South asymmetry in the thickness map of
the atomic hydrogen gas. Assuming vertical hydrostatic equilibrium under the
total potential of the Galaxy, we derive the model thickness map of the HI gas.
We show that simple axisymmetric halo models, such as softened isothermal halo
(producing a flat rotation curve with V_c ~ 220 km/s) or any halo with density
falling faster than the isothermal one, are not able to explain the observed
radial variation of the gas thickness. We also show that such axisymmetric
halos along with different HI velocity dispersion in the two halves, cannot
explain the observed asymmetry in the thickness map. Amongst the
non-axisymmetric models, it is shown that a purely lopsided (m=1, first
harmonic) dark matter halo with reasonable HI velocity dispersion fails to
explain the North-South asymmetry satisfactorily. However, we show that by
superposing a second harmonic (m=2) out of phase onto a purely lopsided halo
e.g. our best fit and more acceptable model A (with parameters
\epsilon_{h}^{1}=0.2, \epsilon_{h}^{2}=0.18 and \sigma_{HI}=8.5 km/s) can
provide an excellent fit to the observation and reproduce the North-South
asymmetry naturally. The emerging picture of the asymmetric dark matter halo is
supported by the \Lambda CDM halos formed in the cosmological N-body
simulation.Comment: 37 pages, 8 figures, accepted for publication in Ap
GRFS and CRFS in alternative donor hematopoietic cell transplantation for pediatric patients with acute leukemia.
We report graft-versus-host disease (GVHD)-free relapse-free survival (GRFS) (a composite end point of survival without grade III-IV acute GVHD [aGVHD], systemic therapy-requiring chronic GVHD [cGVHD], or relapse) and cGVHD-free relapse-free survival (CRFS) among pediatric patients with acute leukemia (n = 1613) who underwent transplantation with 1 antigen-mismatched (7/8) bone marrow (BM; n = 172) or umbilical cord blood (UCB; n = 1441). Multivariate analysis was performed using Cox proportional hazards models. To account for multiple testing, P \u3c .01 for the donor/graft variable was considered statistically significant. Clinical characteristics were similar between UCB and 7/8 BM recipients, because most had acute lymphoblastic leukemia (62%), 64% received total body irradiation-based conditioning, and 60% received anti-thymocyte globulin or alemtuzumab. Methotrexate-based GVHD prophylaxis was more common with 7/8 BM (79%) than with UCB (15%), in which mycophenolate mofetil was commonly used. The univariate estimates of GRFS and CRFS were 22% (95% confidence interval [CI], 16-29) and 27% (95% CI, 20-34), respectively, with 7/8 BM and 33% (95% CI, 31-36) and 38% (95% CI, 35-40), respectively, with UCB (P \u3c .001). In multivariate analysis, 7/8 BM vs UCB had similar GRFS (hazard ratio [HR], 1.12; 95% CI, 0.87-1.45; P = .39), CRFS (HR, 1.06; 95% CI, 0.82-1.38; P = .66), overall survival (HR, 1.07; 95% CI, 0.80-1.44; P = .66), and relapse (HR, 1.44; 95% CI, 1.03-2.02; P = .03). However, the 7/8 BM group had a significantly higher risk for grade III-IV aGVHD (HR, 1.70; 95% CI, 1.16-2.48; P = .006) compared with the UCB group. UCB and 7/8 BM groups had similar outcomes, as measured by GRFS and CRFS. However, given the higher risk for grade III-IV aGVHD, UCB might be preferred for patients lacking matched donors. © 2019 American Society of Hematology. All rights reserved
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