2,516 research outputs found
The solar siblings in the Gaia era
We perform realistic simulations of the Sun's birth cluster in order to
predict the current distribution of solar siblings in the Galaxy. We study the
possibility of finding the solar siblings in the Gaia catalogue by using only
positional and kinematic information. We find that the number of solar siblings
predicted to be observed by Gaia will be around 100 in the most optimistic
case, and that a phase space only search in the Gaia catalogue will be
extremely difficult. It is therefore mandatory to combine the chemical tagging
technique with phase space selection criteria in order to have any hope of
finding the solar siblings.Comment: To be published in the proceedings of the GREAT-ITN conference "The
Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases", 1-5
December 2014, University of Barcelona, Spain, EAS Publications Series, eds
Nicholas Walton, Francesca Figueras, and Caroline Soubira
The evolution of the Sun's birth cluster and the search for the solar siblings with Gaia
We use self-consistent numerical simulations of the evolution and disruption
of the Sun's birth cluster in the Milky Way potential to investigate the
present-day phase space distribution of the Sun's siblings. The simulations
include the gravitational N-body forces within the cluster and the effects of
stellar evolution on the cluster population. In addition the gravitational
forces due to the Milky Way potential are accounted for in a self-consistent
manner. Our aim is to understand how the astrometric and radial velocity data
from the Gaia mission can be used to pre-select solar sibling candidates. We
vary the initial conditions of the Sun's birth cluster, as well as the
parameters of the Galactic potential. We show that the disruption time-scales
of the cluster are insensitive to the details of the non-axisymmetric
components of the Milky Way model and we make predictions, averaged over the
different simulated possibilities, about the number of solar siblings that
should appear in surveys such as Gaia or GALAH. We find a large variety of
present-day phase space distributions of solar siblings, which depend on the
cluster initial conditions and the Milky Way model parameters. We show that
nevertheless robust predictions can be made about the location of the solar
siblings in the space of parallaxes (), proper motions () and
radial velocities (). By calculating the ratio of the number of
simulated solar siblings to that of the number of stars in a model Galactic
disk, we find that this ratio is above 0.5 in the region given by: mas, masyr, and kms. Selecting stars from this region should increase the probability
of success in identifying solar siblings through follow up observations
[Abridged].Comment: 13 pages, 7 figures. Accepted for publication in MNRA
Successes and challenges in public transport policies : comparative analysis of the innovations in the provision of the public passenger transport service in the cities of Curitiba, Brazil; Santiago de Chile, Chile; and Rosario, Argentina
En esta artÃculo realizamos un análisis comparativo de los sistemas de servicio de transporte
público de pasajeros en las ciudades de Curitiba, Brasil; Santiago de Chile, Chile y Rosario,
Argentina para poder comparar las similitudes, diferencias y dificultades que presentan estos
sistemas en la etapa de implementación de las polÃticas públicas; como asà también presentar
una sistematización de las polÃticas, instrumentos y acciones que permitieron gestionar con
éxito las reestructuraciones de los sistemas de transporte y sus aportes para el desarrollo de
una PolÃtica pública de transporte en el Gran Mendoza.In this article we conduct a comparative analysis of the Public Passenger Transport service
systems in the cities of Curitiba, Brazil; Santiago de Chile, Chile; and Rosario, Argentina in order
to compare and contrast similarities, differences and difficulties presented by these systems
during the implementation stages of public policies. We bring in a systematization of policies,
instruments and actions that allowed to manage the restructuring of the transport systems
successfully, as well as their contributions to the development of a Public Transport Policy in
Gran Mendoza.Fil: Marre, Mirta Elena.
Universidad Nacional de Cuyo. Facultad de Ciencias PolÃticas y SocialesFil: Barbosa, Cristina.
Universidad Nacional de Cuyo. Facultad de Ciencias PolÃticas y SocialesFil: MartÃnez, LÃa.
Universidad Nacional de Cuyo. Facultad de Ciencias PolÃticas y Sociale
Análisis de la afectación por vibraciones de la cantera La Roca en zonas cercanas a poblaciones
Trabajo de InvestigaciónEn este trabajo de investigacion presenta los análisis de la afectación por vibraciones de la cantera La Roca en zonas cercanas a poblaciones, con el objetivo de identificar los parámetros que influyen para el control de las vibraciones. Se realizaron visitas de campo a la cantera en la cual se realizaron las voladuras, obteniendo datos exactos por medio de equipos ideoneosINTRODUCCIÓN 1. GENERALIDADES 2. DESCRIPCION DE LAS PRUEBAS CON VOLADURA 3. TRABAJO DE CAMPO 4. RESULTADOS OBTENIDOS 5. ANALISIS DE RESULTADOS 6. CONCLUSIONES Y RECOMENDACIONES BIBLIOGRAFÌA ANEXOSPregradoIngeniero Civi
Oralidad en el sistema acusatorio y sustentación de la apelación contra la sentencia en la ley 1395 de 2010
En este trabajo se examinan los alcances que para la oralidad y el modelo de ascendencia acusatoria tiene la posibilidad, introducida por la Ley 1395 de 2010, de sustentar por escrito la apelación contra la sentencia, y se sostiene que no desnaturaliza sino complementa el sistema procesal de la Ley 906 de 200
Rodajas de piña preservadas por métodos combinados
Pineapple slices were treated by two combined methods, packaged and stored at room temperature. The first preservation method consisted of blanching pineapple slices at 100° C for two minutes followed by a cooling period of 1.5 minutes at room temperature. The slices were then immersed in a 50% sucrose solution with 1,000 ppm of potassium sorbate and 150 ppm of sodium bisulfite. The osmotic treatment was done at room temperature (28.5 ± 1.5° C) for 24 hours. The treated slices were removed from the osmotic solution, the excess syrup from the slices was removed, and the product was later packaged in sealed plastic bags. The final water activity values ranged between 0.95 and 0.97 for the packaged product. For the second preservation method, the pineapple slices were blanched in saturated steam for 12 minutes and stored at 12° C until processing by combined methods. Sucrose solutions (55 and 60° Brix) with four different concentrations of potassium sorbate (100, 200, 300, or 500 ppm) were used as osmotic solutions. The water activity was 0.91 after the osmotic process and 0.88 after hot air drying. A shelf life of at least 30 days was observed for product prepared with both preservation techniques, and the sensory characteristics noted were similar to those in a commercially canned product (Del Monte canned slices). The inhibitory effect of potassium sorbate on yeast and mold growth was significant for concentrations above 300 ppm.Se trataron rebanadas de pina con dos métodos combinados y se almacenaron a temperatura ambiente para evaluar su vida útil. El primer método de preservación consistió en escaldar la fruta a 100° C por dos minutos y luego enfriarla a temperatura ambiente (28.5 ± 1.5° C) por 1.5 minutos. Tras el enfriamiento se procedió a colocar las rodajas en almÃbar al 50% de sacarosa con 1,000 ppm de sorbato de potasio y 150 ppm de bisulfito de sodio. El tratamiento osmótico se hizo a temperatura ambiente por 24 horas. Las rodajas se sacaron del almÃbar y se empacaron en bolsas plásticas luego de escurrir la mayor parte del almÃbar. La actividad de agua del producto empacado fluctuó entre 0.95 y 0.97. En el segundo método de preservación, las rebanadas de piña se escaldaron en vapor saturado por 12 minutos y se almacenaron en refrigeración (12° C) hasta su tratamiento por métodos combinados. Se usaron soluciones de sacarosa de 66 y 60° Brix con cuatro niveles de sorbato de potasio (100, 200, 300, 500 ppm) para la deshidratación osmótica de las rebanadas. Una vez en equilibrio, se removieron las rebanadas de la solución de sacarosa y se secaron parcialmente con aire caliente por una hora. El valor de actividad de agua fuego del tratamiento osmótico fue de 0.91 y bajó a 0.88 luego del secado parcial con aire caliente. Para ambos métodos de preservación se observó un perÃodo no menor a 30 dÃas durante el cual las caracterÃsticas sensoriales del producto compararon favorablemente con las de productos comerciales de piña enlatada (Del Monte). El efecto inhibidor de sorbato de potasio sobre los hongos y las levaduras fue evidente a concentraciones mayores de 300 ppm
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