70 research outputs found
La prescripción del ejercicio físico para personas mayores: valores normativos de la condición física
La evaluación de la condición física debe ser considerado como un aspecto a tener en cuenta a la hora de determinar la capacidad funcional de los ancianos. Debido a la no existía de unos valores referenciales, a partir de los cuales determinar el estado físico de los ancianos, y a las posibilidades que esta información nos daría, a la hora de prescribir ejercicio, fue lo que nos condujo a la llevar a cabo este estudio. El estudio etnográfico se llevó a cabo en la Comunidad Autónoma Gallega y en el se testaron a 159 hombres y 692 mujeres, todos mayores de 65 años e inscriptos en programas de actividad física. La muestra realizó voluntariamente las ocho pruebas de que consta la Batería E.C.F.A, mediante la cual se evaluó: 1)Composición corporal, 2)Fuerza máxima de prensión manual, 3)Equilibrio monopodal, 4)Fuerza resistencia abdominal, 5)Flexibilidad anterior del tronco, 6)Fuerza máxima de piernas, 7)Coordinación Oculo-manual (Agilidad manual) y 8)Resistencia Cardio-respiratoria (Caminar 2 Km)
An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408
We report observations of 6cm, 3.6cm, 1.3cm, and 7mm radio continuum,
conducted with the Very Large Array towards IRAS18566+0408, one of the few
sources known to harbor H2CO 6cm maser emission. Our observations reveal that
the emission is dominated by an ionized jet at cm wavelengths. Spitzer/IRAC
images from GLIMPSE support this interpretation, given the presence of 4.5um
excess emission at approximately the same orientation as the cm continuum. The
7mm emission is dominated by thermal dust from a flattened structure almost
perpendicular to the ionized jet, thus, the 7mm emission appears to trace a
torus associated with a young massive stellar object. The H2CO 6cm maser is
coincident with the center of the torus-like structure. Our observations rule
out radiative pumping via radio continuum as the excitation mechanism for the
H2CO 6cm maser in IRAS18566+0408.Comment: 20 pages, 4 figures, ApJ (in press
Mid-Infrared Photometry and Spectra of Three High Mass Protostellar Candidates at IRAS 18151-1208 and IRAS 20343+4129
We present arcsecond-scale mid-ir photometry (in the 10.5 micron N band and
at 24.8 microns), and low resolution spectra in the N band (R~100) of a
candidate high mass protostellar object (HMPO) in IRAS 18151-1208 and of two
HMPO candidates in IRAS 20343+4129, IRS 1 and IRS 3. In addition we present
high resolution mid-ir spectra (R~80000) of the two HMPO candidates in IRAS
20343+4129. These data are fitted with simple models to estimate the masses of
gas and dust associated with the mid-ir emitting clumps, the column densities
of overlying absorbing dust and gas, the luminosities of the HMPO candidates,
and the likely spectral type of the HMPO candidate for which [Ne II] 12.8
micron emission was detected (IRAS 20343+4129 IRS 3). We suggest that IRAS
18151-1208 is a pre-ultracompact HII region HMPO, IRAS 20343+4129 IRS 1 is an
embedded young stellar object with the luminosity of a B3 star, and IRAS
20343+4129 IRS 3 is a B2 ZAMS star that has formed an ultracompact HII region
and disrupted its natal envelope.Comment: 40 pages, 8 figures, 3 tables. Accepted for publication in
Astrophysical Journal (Part 1
Near-Infrared Photometry and Radio Continuum Study of the Massive Star Forming Regions IRAS 21413+5442 and IRAS 21407+5441
IRAS 21413+5442 and IRAS 21407+5441 are two massive star forming regions of
high luminosity, likely associated with each other. Near-infrared photometry on
these two IRAS sources was performed at UKIRT using the UFTI under excellent
seeing conditions yielding an angular resolution of 0.5 arcsec. Our
results reveal details of stellar content to a completeness limit (90%) of J =
18.5, H = 18.0, and K = 17.5 mag in the two regions. In IRAS 21413+5442, we
identify a late O type star, having large (H-K) color, to be near the centre of
the CO jets observed by earlier authors. The UKIRT images reveal in IRAS
21407+5441, a faint but clear compact HII region around a central high -
intermediate mass star cluster. We have detected a number of sources with large
(H-K) color which are not detected in J band. We also present the GMRT radio
continuum map at 1.28 GHz covering the entire region surrounding the two star
forming clouds. The radio continuum fluxes are used to estimate the properties
of HII regions which seem to support our near-IR photometric results. Based on
our radio continuum map and the archival MSX 8.2 m image, we show that the
two IRAS sources likely belong to the same parent molecular cloud and
conjecture that a high mass star of large IR colors, present in between the two
sources, might have triggered star formation in this region. However one can
not rule out the alternative possibility that Star A could be a nearby
foreground star.Comment: 12 pages, 7 figures, accepted for publication in MNRA
SEOM clinical guidelines for the treatment of head and neck cancer (2017)
Head and neck cancer (HNC) is defined as malignant tumours located in the upper aerodigestive tract and represents 5% of oncologic cases in adults in Spain. More than 90% of these tumours have squamous histology. In an effort to incorporate evidence obtained since 2013 publication, Spanish Society of Medical Oncology (SEOM) presents an update of HNC diagnosis and treatment guideline. The eighth edition of TNM classification, published in January 2017, introduces important changes for p16-positive oropharyngeal tumours, for lip and oral cavity cancer and for N3 category. In addition, there are new data about induction chemotherapy and the role of immunotherapy in HNC
A clumpy-cloud PDR model of the global far-infrared line emission of the Milky Way
The fractal structure of the interstellar medium suggests that the
interaction of UV radiation with the ISM as described in the context of
photon-dominated regions (PDR) dominates most of the physical and chemical
conditions, and hence the far-infrared and submm emission from the ISM in the
Milky Way. We investigate to what extent the Galactic FIR line emission of the
important species CO, C, C+, and O, as observed by the Cosmic Background
Explorer (COBE) satellite can be modeled in the framework of a clumpy,
UV-penetrated cloud scenario. The far-infrared line emission of the Milky Way
is modeled as the emission from an ensemble of clumps with a power law clump
mass spectrum and mass-size relation with power-law indices consistent with the
observed ISM structure. The individual clump line intensities are calculated
using the KOSMA-tau PDR-model for spherical clumps. The model parameters for
the cylindrically symmetric Galactic distribution of the mass density and
volume filling factor are determined by the observed radial distributions. A
constant FUV intensity, in which the clumps are embedded, is assumed. We show
that this scenario can explain, without any further assumptions and within a
factor of about 2, the absolute FIR-line intensities and their distribution
with Galactic longitude as observed by COBE.Comment: 14 pages, 13 figures, accepted by A&A at the 7th of July, 200
ISOCAM view of the starburst galaxies M82, NGC253, and NGC1808
We present results of mid-infrared 5.0-16.5 micron spectrophotometric imaging
of the starburst galaxies M82, NGC253, and NGC1808 from the ISOCAM instrument
on board the Infrared Space Observatory. The mid-infrared spectra of the three
galaxies are very similar in terms of features present. The > 11 micron
continuum attributed to very small dust grains (VSGs) exhibits a large spread
in intensity relative to the short-wavelength emission. We find that the 15
micron dust continuum flux density correlates well with the fine-structure
[ArII] 6.99 micron line flux and thus provides a good quantitative indicator of
the level of star formation activity. By contrast, the 5-11 micron region
dominated by emission from polycyclic aromatic hydrocarbons (PAHs) has a nearly
invariant shape. Variations in the relative intensities of the PAH features are
nevertheless observed, at the 20%-100% level. We illustrate extinction effects
on the shape of the mid-infrared spectrum of obscured starbursts, emphasizing
the differences depending on the applicable extinction law and the consequences
for the interpretation of PAH ratios and extinction estimates. The relative
spatial distributions of the PAH, VSG, and [ArII] 6.99 micron emission between
the three galaxies exhibit remarkable differences. The < 1 kpc size of the
mid-infrared source is much smaller than the optical extent of our sample
galaxies and 70%-100% of the IRAS 12 micron flux is recovered within the ISOCAM
< 1.5 arcmin squared field of view, indicating that the nuclear starburst
dominates the total mid-infrared emission while diffuse light from quiescent
disk star formation contributes little.Comment: 25 pages, 12 figures, accepted for publication in Astronomy and
Astrophysics; Figs. 3, 4, 5, 6, 7, 9, 10, 12 appear after Sect.
The <i>Herschel</i> view of the massive star-forming region NGC 6334
Aims: Fundamental to any theory of high-mass star formation are gravity and turbulence. Their relative importance, which probably changes during cloud evolution, is not known. By investigating the spatial and density structure of the high-mass star-forming complex NGC 6334 we aim to disentangle the contributions of turbulence and gravity.
Methods: We used Herschel PACS and SPIRE imaging observations from the HOBYS key programme at wavelengths of 160, 250, 350, and 500 μm to construct dust temperature and column density maps. Using probability distribution functions (PDFs) of the column density determined for the whole complex and for four distinct sub-regions (distinguished on the basis of differences in the column density, temperature, and radiation field), we characterize the density structure of the complex. We investigate the spatial structure using the Δ-variance, which probes the relative amount of structure on different size scales and traces possible energy injection mechanisms into the molecular cloud.
Results: The Δ-variance analysis suggests that the significant scales of a few parsec that were found are caused by energy injection due to expanding HII regions, which are numerous, and by the lengths of filaments seen everywhere in the complex. The column density PDFs have a lognormal shape at low densities and a clearly defined power law at high densities for all sub-regions whose slope is linked to the exponent α of an equivalent spherical density distribution. In particular with α = 2.37, the central sub-region is largly dominated by gravity, caused by individual collapsing dense cores and global collapse of a larger region. The collapse is faster than free-fall (which would lead only to α = 2) and thus requires a more dynamic scenario (external compression, flows). The column density PDFs suggest that the different sub-regions are at different evolutionary stages, especially the central sub-region, which seems to be in a more evolved stage
Problematic Internet Use in University Students: associated factors and differences of gender
El objetivo del presente trabajo es realizar un análisis descriptivo del uso problemático de Internet en estudiantes universitarios, evaluando la posible asociación con problemas de salud y conductas adictivas, así como diferencias de género en los tipos utilización. Un total de 2780 alumnos participaron en el estudio entre los años 2011 – 2014, siendo un 29% varones (edad 20.8 ± 5.1 años) y un 71% mujeres (edad de 20.3 ± 4.4 años). La prevalencia de uso problemático de Internet evaluada mediante el Internet Addiction Test fue del 6.08%. Ser menor de 21 años y cursar titulaciones diferentes a ciencias de la salud fueron factores asociados a una mayor frecuencia de este problema, no existiendo diferencias en función del sexo o tipo de domicilio. Los resultados muestran una asociación significativa con algunos problemas de salud (migrañas, dolor lumbar, sobrepeso u obesidad, descanso insuficiente), aspectos psicológicos (riesgo de trastornos de la conducta alimentaria, riesgo de trastorno mental, depresión), problemas familiares y discriminación; no encontrándose asociaciones con consumo de sustancias adictivas (alcohol, tabaco o cannabis). Respecto al tiempo de uso de Internet, las horas de conexión semanales fueron significativamente mayores en las mujeres que en los hombres, tanto en el tiempo total como por motivos de ocio. El análisis del perfil de utilización en usuarios problemáticos reveló que los varones se relacionan más con aspectos de ocio como los juegos o las compras online y las mujeres con aspectos de socialización, como el chat o las redes sociales
Processing of Abstract Rule Violations in Audition
The ability to encode rules and to detect rule-violating events outside the focus of attention is vital for adaptive behavior. Our brain recordings reveal that violations of abstract auditory rules are processed even when the sounds are unattended. When subjects performed a task related to the sounds but not to the rule, rule violations impaired task performance and activated a network involving supratemporal, parietal and frontal areas although none of the subjects acquired explicit knowledge of the rule or became aware of rule violations. When subjects tried to behaviorally detect rule violations, the brain's automatic violation detection facilitated intentional detection. This shows the brain's capacity for abstraction – an important cognitive function necessary to model the world. Our study provides the first evidence for the task-independence (i.e. automaticity) of this ability to encode abstract rules and for its immediate consequences for subsequent mental processes
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