241 research outputs found
La lingua italiana per l’inclusione e per il lavoro: teorie e pratiche didattiche in contesto migratorio
Il volume è l’esito di un progetto FAMI (Fondo Asilo Migrazione e Integrazione) svoltosi negli anni
2019-2022 grazie al lavoro di rete costante tra vari enti, associazioni e Università nell’intento comune di facilitare l’inclusione delle e dei migranti nel contesto sociale e lavorativo della Regione Marche.
Il volume si snoda intorno a due assi di interesse principali, cui corrispondono due specifiche sezioni con approfondimenti teorico-metodologici su tematiche di grande attualità , sia nell’ambito della ricerca accademica sia in quello delle pratiche di inclusione attuate nei contesti di accoglienza: l’italiano L2 per migranti analfabeti bassamente scolarizzati (I parte) e l’italiano L2 come lingua per il lavoro (II parte), affrontati nella duplice prospettiva della formazione linguistica in contesto migratorio e della formazione dei docenti. Il volume è completato da una terza parte con alcuni scenari didattici di italiano L2 per l’inserimento socioprofessionale delle e dei migranti nei settori della ristorazione e della cura alla persona, realizzati nel corso del progetto.
Il volume si rivolge in primis ad attuali e potenziali insegnanti di italiano L2 a migranti vulnerabili, che potranno trovarvi utili spunti operativi oltre che approfondimenti teorico-metodologici aggiornati sui temi succitati
Extremely Red Objects in Two Quasar Fields at z ~ 1.5
We present an investigation of the properties and environments of bright
extremely red objects (EROs) found in the fields of the quasars TXS 0145+386
and 4C 15.55, both at z ~ 1.4. There is marginal evidence from Chandra ACIS
imaging for hot cluster gas with a luminosity of a few 10^44 ergs/s in the
field of 4C 15.55. The TXS 0145+386 field has an upper limit at a similar
value, but it also clearly shows an overdensity of faint galaxies. None of the
EROs are detected as X-ray sources. For two of the EROs that have
spectral-energy distributions and rest-frame near-UV spectra that show that
they are strongly dominated by old stellar populations, we determine
radial-surface-brightness profiles from adaptive-optics images. Both of these
galaxies are best fit by profiles close to exponentials, plus a compact nucleus
comprising ~30% of the total light in one case and 8% in the other. Neither is
well fit by an r^1/4-law profile. This apparent evidence for the formation of
massive ~2 X 10^11 disks of old stars in the early universe indicates that at
least some galaxies formed essentially monolithically, with high star-formation
rates sustained over a few 10^8 years, and without the aid of major mergers.Comment: 25 pages, 13 figures, accepted to Ap
UGC 3995: A Close Pair of Spiral Galaxies
UGC 3995 is a close pair of spiral galaxies whose eastern component hosts a
Seyfert 2 nucleus. We present a detailed analysis of this system using long
slit spectroscopy and narrow (\ha + \nii) as well as broad band (B, R) imaging
and an archive WFPC2 image. The component galaxies reveal surprisingly small
signs of interaction considering their spatial proximity and almost identical
recession velocities, as the bright filament is probably an optical illusion
due to the superposition of the bar of the Seyfert galaxy and of the spiral
arms of the companion. The broad band morphology, a B--R color map, and a
continuum-subtracted \ha + \nii image demonstrate that the western component
UGC 3995B is in front of the Seyfert-hosting component UGC 3995A, partly
obscuring its western side. The small radial velocity difference leaves the
relative motion of the two galaxies largely unconstrained. The observed lack of
major tidal deformations, along with some morphological peculiarities, suggests
that the galaxies are proximate in space but may have recently approached each
other on the plane of the sky. The geometry of the system and the radial
velocity curve at P. A. = 106 suggest that the encounter may be retrograde or,
alternatively, prograde before perigalacticon. The partial overlap of the two
galaxies allows us to estimate the optical thickness of the disk of component
B. We derive an extinction = 0.18 visual magnitudes in the infra-arms parts of
the foreground galaxy disk, and >= 1-1.5 visual magnitudes in correspondence of
the spiral arms.Comment: Accepted for publication in the Astronomical Journal (June 1999
issue
Shrinking of Cluster Ellipticals: a Tidal Stripping explanation and Implications for the Intra-Cluster Light
We look for evidence of tidal stripping in elliptical galaxies through the
analysis of homogeneous CCD data corresponding to a sample of 228 elliptical
galaxies belonging to 24 clusters of galaxies at . We
investigate departures from the standard magnitude-isophotal size relation, as
a function of environmental (cluster-centric distance, local galaxy density)
and structural (cluster velocity dispersion, Bautz-Morgan type) properties. We
find that, for any particular galaxy luminosity, the ellipticals in the inner
and denser regions of the clusters are about 5% smaller than those in the outer
regions, which is in good agreement with the finding of Strom & Strom (1978)
based on photographic photometry. The null hypothesis (ie., galaxy sizes are
independent of the cluster-centric distance or density) is rejected at a
significance level of better than 99.7%. Numericals models of Aguilar & White
(1986) predict that tidal stripping can lead to changes in the whole structure
of ellipticals producing shrinkage and brightening of the galaxy, qualitatively
consistent with our measurements and also with the findings of Trujillo et al.
(2002), that more centrally concentrated ellipticals populate denser regions.
Our observational results can be interpreted as evidence for stripping of stars
from ellipticals in the central/denser regions of clusters, contributing to the
intra-cluster light observed in these structures.Comment: AJ Accepted, 15 pages, 9 figure
X-ray Spectral Properties of Low-Mass X-ray Binaries in Nearby Galaxies
We investigated the X-ray spectral properties of a collection of low-mass
X-ray binaries (LMXBs) within a sample of 15 nearby early-type galaxies
observed with Chandra. We find that the spectrum of the sum of the sources in a
given galaxy is remarkably similar from galaxy to galaxy when only sources with
X-ray luminosities less than 10^39 ergs/s (0.3-10 keV) are considered. Fitting
these lower luminosity sources in all galaxies simultaneously yielded a
best-fit power law exponent of Gamma = 1.56 +/- 0.02 (or kT_brem = 7.3 +/- 0.3
keV). This is the tightest constraint to date on the spectral properties of
LMXBs in external galaxies. There is no apparent difference in the spectral
properties of LMXBs that reside inside and outside globular clusters. We
demonstrate how the uniformity of the spectral properties of LMXBs can lead to
more accurate determinations of the temperature and metallicity of the hot gas
in galaxies. Although few in number in any given galaxy, sources with
luminosities of 1-2 x 10^39 ergs/s are present in 10 of the galaxies. The
spectra of these luminous sources are softer than the spectra of the rest of
the sources, and are consistent with the spectra of Galactic black hole X-ray
binary candidates when they are in their very high state. The spectra of these
sources are very different than those of ultraluminous X-ray sources (ULXs)
found within spiral galaxies, suggesting that the two populations of X-ray
luminous objects have different formation mechanisms. The number of sources
with apparent luminosities above 2 x 10^39 ergs/s is equal to the number of
expected background AGN and thus appear to not be associated with the galaxy,
indicating that very luminous sources are absent or very rare in early-type
galaxies. (Abridged)Comment: 11 pages in emulateapj5 style with 4 embedded Postscript figures; to
be accepted by Ap
The role of the multifaceted long non-coding RNAs: A nuclear-cytosolic interplay to regulate hyaluronan metabolism
In the extracellular matrix (ECM), the glycosaminoglycan (GAG) hyaluronan (HA) has different physiological roles favouring hydration, elasticity and cell survival. Three different isoforms of HA synthases (HAS1, 2, and 3) are responsible for the production of HA. In several pathologies the upregulation of HAS enzymes leads to an abnormal HA accumulation causing cell dedifferentiation, proliferation and migration thus favouring cancer progression, fibrosis and vascular wall thickening. An intriguing new player in HAS2 gene expression regulation and HA production is the long non-coding RNA (lncRNA) hyaluronan synthase 2 antisense 1 (HAS2-AS1). A significant part of mammalian genomes corresponds to genes that transcribe lncRNAs; they can regulate gene expression through several mechanisms, being involved not only in maintaining the normal homeostasis of cells and tissues, but also in the onset and progression of different diseases, as demonstrated by the increasing number of studies published through the last decades. HAS2-AS1 is no exception: it can be localized both in the nucleus and in the cytosol, regulating cancer cells as well as vascular smooth muscle cells behaviour
A Disk Galaxy of Old Stars at z ~ 2.5
We describe observations of a galaxy in the field of the radio
galaxy 4C 23.56, photometrically selected to have a spectral-energy
distribution consistent with an old stellar population at the redshift of the
radio galaxy. Exploration of redshift--stellar-population-reddening constraints
from the photometry indicates that the galaxy is indeed at a redshift close to
that of 4C23.56, that the age of the most recent significant star formation is
roughly >~2 Gyr, and that reddening is fairly modest, with more reddening
required for the younger end of stellar age range. From analysis of a deep
adaptive-optics image of the galaxy, we find that an r^1/4-law profile, common
for local spheroidal galaxies, can be excluded quite strongly. On the other
hand, a pure exponential profile fits remarkably well, while the best fit is
given by a Sersic profile with index n=1.49. Reconstruction of the
two-dimensional form of the galaxy from the best-fit model is consistent with a
disk galaxy with neither a significant bulge component nor gross azimuthal
structure. The assembly of roughly 2L* of old stars into such a configuration
this early in the history of the universe is not easily explainable by any of
the currently popular scenarios for galaxy formation. A galaxy with these
properties would seem to require smooth but rapid infall of the large mass of
gas involved, followed by a burst of extremely vigorous and efficient star
formation in the resulting disk.Comment: 8 pages, 6 figures, emulateapj.sty, accepted for publication in The
Astrophysical Journa
Third workshop on full-body and multisensory experience
The workshop on "Full-Body and Multisensory Experience" aims at discussing the rich possibilities that the body offers to experience the external world and the prospects that arise for interaction designers when these often-neglected abilities are taken into account. In particular, the workshop will focus on the rediscovery of the human senses, either alone or in a multimodal combination, and of the perceptual-motor abilities of our body. The one-day workshop is divided in three steps: first phase is for the generation of ideas on multisensory interfaces, in the second phase, participants will have the possibilities to explore and rediscover their sensorimotor abilities through several exercises and games; in the third and last phase, there will be a further creative session in order to evaluate how the full body and multisensory activities have fostered people's creative processes. The aim of the whole experience is twofold: first, inspiring participants in designing novel concepts for multisensory interfaces; second, providing a preliminary study on the effect of these exercises in fostering creativity and supporting the design process of multisensory interfaces
HST Observations of the Host Galaxies of BL Lacertae Objects
Six BL Lac objects from the complete 1 Jy radio-selected sample of 34 objects
were observed in Cycle 5 with the HST WFPC2 camera to an equivalent limiting
flux of mu_I~26 mag/arcsec^2. Here we report results for the second half of
this sample, as well as new results for the first three objects, discussed
previously by Falomo et al. (1997). In addition, we have analyzed in the same
way HST images of three X-ray-selected BL Lacs observed by Jannuzi et al.
(1997). The ensemble of 9 BL Lac objects spans the redshift range from z=0.19
to ~1. Host galaxies are clearly detected in seven cases, while the other two,
at z~0.258 (redshift highly uncertain) and z=0.997, are not resolved. The HST
images constitute a homogeneous data set with unprecedented morphological
information between a few tenths of an arcsecond and several arcseconds from
the nucleus, allowing us in 6 of the 7 detected host galaxies to rule out
definitively a pure disk light profile. The host galaxies are luminous
ellipticals with an average absolute magnitude of M_I~-24.6 mag (with
dispersion 0.7 mag), more than a magnitude brighter than L* and comparable to
brightest cluster galaxies. The morphologies are generally smooth and have
small ellipticities (epsilon<0.2). Given such roundness, there is no obvious
alignment with the more linear radio structures. In the six cases for which we
have HST WFPC2 images in two filters, the derived color profiles show no strong
spatial gradients and are as expected for K-corrected passively evolving
elliptical galaxies. The host galaxies of the radio-selected and X-ray-selected
BL Lacs for this very limited sample are comparable in both morphology and
luminosity.Comment: 23 pages, including 6 postscript figures and 3 tables (embedded).
Latex requires aaspp4.sty and psfig.sty (not included). Accepted for
publication in the Astrophysical Journa
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