272 research outputs found
A retrospective and prospective view of intercultural mediation in catalonia
En los últimos años la traducción lingüística y la mediación intercultural se han convertido en un ejercicio cada vez más presente y utilizado en servicios e instituciones educativas de Cataluña; tal como se acostumbra a decir popularmente, la práctica va por delante de la teoría y en este caso es muy cierto. A pesar de este bagaje, dicha práctica se manifiesta llena de interrogantes y, sin embargo, no se está produciendo paralelamente una reflexión y clarificación de su funcionamiento. Por ello, nos pareció que nos hallábamos en un momento adecuado para examinarla, ya que se están tomando diversas iniciativas de formación y actuación de mediadores, en este último caso casi siempre en relación con situaciones o marginación de determinados grupos etnoculturales.In recent years, linguistic translation and intercultural mediation have become
more common and widely used in Catalonian services and educational institutions.
In such cases, practice has proved to go before theory, but practice is full of
questions marks that are not leading to a parallel theoretical reflection. That is
why we believe this to be the right moment to examine such practices, given
that various initiatives are underway to train and use mediators in relation with
situations of exclusion of specific ethno-cultural groups
Constraining the Envelope Structure of L1527 IRS: Infrared Scattered Light Modeling
We model Spitzer Space Telescope observations of the Taurus Class 0 protostar
L1527 IRS (IRAS 04368+2557) to provide constraints on its protostellar envelope
structure. The nearly edge-on inclination of L1527 IRS, coupled with the highly
spatially-resolved near to mid-infrared images of this object and the detailed
IRS spectrum, enable us to constrain the outflow cavity geometry quite well,
reducing uncertainties in the other derived parameters. The mid-infrared
scattered light image shows a bright central source within a dark lane; the
aspect ratio of this dark lane is such that it appears highly unlikely to be a
disk shadow. In modeling this dark lane, we conclude that L1527 IRS is probably
not described by a standard TSC envelope with simple bipolar cavities. We find
it necessary to model the dark lane and central source as a modified inner
envelope structure. This structure may be due either to a complex wind-envelope
interaction or induced by the central binary. To fit the overall SED, we
require the central source to have a large near to mid-infrared excess,
suggesting substantial disk accretion. Our model reproduces the overall
morphology and surface brightness distribution of L1527 IRS fairly well, given
the limitations of using axisymmetric models to fit the non-axisymmetric real
object, and the derived envelope infall rates are in reasonable agreement with
some other investigations. IRAC observations of L1527 IRS taken 12 months apart
show variability in total flux and variability in the opposing bipolar
cavities, suggesting asymmetric variations in accretion. We also provide model
images at high resolution for comparison to future observations with current
ground-based instrumentation and future space-based telescopes.Comment: 50 pages, 14 figures 2 tables, accepted by the Astrophysical Journal.
The manuscript with full resolution figures can be downloaded from
http://astro.lsa.umich.edu/~jjtobin/L1527.pd
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