316 research outputs found
Concepciones del profesorado durante un proceso formativo en torno al trabajo por proyectos: estudio de un caso en Educación Primaria
El trabajo por proyectos constituye una alternativa curricular con potencialidad para mejorar los procesos
de enseñanza-aprendizaje en los centros educativos. En el presente artículo se detalla el proceso de formación llevado
a cabo por el profesorado de un centro de Educación Infantil y Primaria antes y durante la implementación de un
proyecto de trabajo por proyectos. La investigación, a partir de la metodología de estudio de casos, ha utilizado métodos
mixtos tanto cualitativos (a través de entrevistas, observación directa y análisis de documentos), como cuantitativos,
mediante la administración de un cuestionario. Los resultados del estudio muestran que tanto el proceso formativo
desarrollado como el diseño y desarrollo de un proyecto de trabajo en el centro, ha representado una oportunidad de
aprendizaje para alumnado y profesorado. Sin embargo, la apuesta por el trabajo por proyectos evidencia las
dificultades que experimenta el centro para su materialización práctica, especialmente en cuanto a las limitaciones
temporales para el diseño y evaluación del proyecto. Las conclusiones muestran las ventajas de fomentar procesos
formativos en los centros en torno al trabajo por proyectos, además de permitir extraer una serie de recomendaciones
a modo de propuestas para la mejora y sostenibilidad de las experiencias.Project work has the potential to improve teaching and learning processes in schools. This article details the
training process carried out by the teachers of an Early Childhood and Primary Education center before and during
the implementation of a project work initiative. The research utilized a case study methodology using mixed methods,
both qualitative (through interviews, direct observation and document analysis), and quantitative, through the
administration of a questionnaire. The results of the study show that the training process, as well as the design and
development of the project, have represented a learning opportunity for students and teachers. However, the
commitment to project work shows an apparent difficulty in implementation, especially in terms of time limitations
for its design and evaluation. In summary, the study has shown the advantages of promoting training processes within
the schools in regards to project work. In addition, proposals for the improvement and sustainability of the experiences
are recommended
InGaAs Capacitor-Less DRAM Cells TCAD Demonstration
2D numerical TCAD simulations are used to infer the behavior of III-V capacitor-less dynamic
RAM (DRAM) cells. In particular, indium gallium arsenide on insulator technology is selected to verify
the viability of III-V meta-stable-dip RAM cells. The cell performance dependence on several parameters
(such as the back-gate voltage, semiconductor thickness, indium/gallium mole fraction or interface traps)
and simulation models (like ballisticity or spatial quantum confinement) is analyzed and commented.
Functional cells are presented and compared with analogous silicon 1T-DRAM memories to highlight the
advantages and drawbacks.This work was supported by H2020 REMINDER European under Grant 687931, and in part by the
Spanish National Projects under Grant TEC2014-59730 and Grant PCIN-2015-146
The CaT strength in Seyfert nuclei revisited: analyzing young stars and non-stellar light contributions to the spectra
In a former paper (Garcia-Rissmann et al. 2005; hereafter Paper I), we have
presented spectra of 64 active, 9 normal and 5 Starburst galaxies in the region
around the near-IR Calcium triplet absorption lines and the [SIII]9069 line. In
the present paper we analyze the CaT strength (WCaT), and kinematical products
derived in that study, namely stellar and ionized gas velocity dispersions. Our
main results may be summarized as follows: (1) Seyfert 2s show no sign of
dilution in WCaT with respect to the values spanned by normal galaxies, even
when optical absorption lines such as the CaII K band at 3933 A are much weaker
than in old, bulge-like stellar populations. (2) The location of Seyfert 2s in
the WCaT-WCaK plane is consistent with evolutionary synthesis models. The
implication is that the source responsible for the dilution of optical lines in
these AGN is a young stellar population, rather than an AGN featureless
continuum, confirming the conclusion of the pioneer study of Terlevich, Diaz &
Terlevich. (3) In Seyfert 1s, both W[SIII] and WCaT tend to be diluted due to
the presence of a non-stellar component, in agreement with the unification
paradigm. (4) A comparison of stellar and gas velocity dispersions confirms the
existence of a correlation between the typical velocities of stars and clouds
of the Narrow Line Region. The strength and scatter around this correlation are
similar to those previously obtained from the [OIII]5007 line width.Comment: 14 pages, 15 figures. Paper accepted for publication in MNRA
Uso de inoculante y fertilización nitrogenada en la producción de forraje de avena, ballico y trigo
The objectives were evaluating the combined effects of different rates of both inoculum (Rhodococcus fascians) and nitrogen on forage production of grasses and to perform a cost - benefit economic analysis. The species analyzed were Avena sativa L, Lolium multiflorum Lam, and Triticum durum L through the following treatments: inoculation, nitrogen fertilization (0, 30, 60 kg N ha-1) and a combination of inoculation and fertilization.Los objetivos fueron evaluar el efecto combinado de diferentes dosis de inoculante (Rhodococcus fascians) y fertilización nitrogenada en la producción de forraje de gramíneas así como la relación costo/beneficio. Las gramíneas fueron: Avena sativa L, Lolium multiflorum Lam yTriticum durum L con los siguientes tratamientos: inoculación,fertilización nitrogenada (0, 30, 60 kg N ha-1), y la combinación de inoculante y fertilización
The afterglow and kilonova of the short GRB 160821B
GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized
by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at
z=0.1613, at a projected physical offset of 16 kpc from the galaxy's center. We
present X-ray, optical/nIR and radio observations of its counterpart and model
them with two distinct components of emission: a standard afterglow, arising
from the interaction of the relativistic jet with the surrounding medium, and a
kilonova, powered by the radioactive decay of the sub-relativistic ejecta.
Broadband modeling of the afterglow data reveals a weak reverse shock
propagating backward into the jet, and a likely jet-break at 3.5 d. This is
consistent with a structured jet seen slightly off-axis while expanding into a
low-density medium. Analysis of the kilonova properties suggests a rapid
evolution toward red colors, similar to AT2017gfo, and a low nIR luminosity,
possibly due to the presence of a long-lived neutron star. The global
properties of the environment, the inferred low mass (M_ej < 0.006 Msun) and
velocities (v > 0.05 c) of lanthanide-rich ejecta are consistent with a binary
neutron star merger progenitor.Comment: 14 pages, 6 figures, MNRAS, in press. Moderate revision, added Figure
5 and X-ray data to Table
Calidad de vida y sus factores determinantes en universitarios españoles de Ciencias de la Salud
La calidad de vida en la población universitaria
adquiere una especial importancia ya que permite
obtener información sobre las condiciones de vida
de los universitarios y, sobre todo, de cómo éstos las perciben.
Objetivo: Evaluar la calidad de vida de los universitarios
que cursan estudios en ciencias de la salud y su
relación con diferentes factores tales como: hábitos de
vida, parámetros antropométricos y la influencia de las
distintas variables sobre su percepción.
Material y Método: Estudio transversal de una muestra
de 1.753 estudiantes de ciencias de la salud de nueve
universidades españolas con diseño muestral aleatorio y
estatrificado según curso y facultad al que se le aplicó
un cuestionaro ad hoc que recogía todas las variables a
estudio.
Resultados: La calidad de vida percibida por los participantes
fue Me = 75. Los factores explorados de la calidad
de vida se co-relacionaron significativamente con la
percepción global de calidad de vida de los estudiantes
(p<0,001). Se establecieron 3 dimensiones y el impacto de
cada una de ellas sobre la percepción de calidad de vida
global fue p<0,001. Los varones percibieron mejor calidad
de vida que las mujeres y también los estudiantes con
menor Índice de Masa Corporal (IMC).
Conclusión: Los universitarios son una población clave
para realizar actividades de promoción y prevención
de la salud por lo que resulta necesario crear mejores infraestucturas
y recursos educativos para mejorar la CV y
fomentar hábitos y estilos de vida saludable con especial
atención en la alimentación y la realización de una adecuada
actividad física.Abstract
Introduction: The quality of life of university students
acquires special importance because it provides information
about their life conditions and especially how they
perceive it.
Objetive: Evaluate the quality of life of students who
are enrolled in health science studies and its relation with
the following diverse factors: life and dietetic habits, anthropometric
parameters and the influence of distinct
variables on their perception.
Methods: Transversal study of a sample of 1753 health
science degree students of nine Spanish universities with
a randomized design and stratified by course and faculty
for which we applied an ad hoc questionnaire that considered
all study variables.
Results: The quality of life (QoL) perceived by the
participants had a Median of 75. The factors that were
explored about the quality of life correlated significantly
with their global perception of it (p<0.001). Three dimensions
were established and the impact of each one of them
on their global perception of QoL was p<0.001. Men perceived
better QoL then women and the students with lower
Body Mass Index (BMI).
Conclusions: University students are a key population
for realizing health promotion and prevention activities
therefore it is necessary to develop and provide better
infrastructures and educative resources in order to enhance
their QoL and to promote healthier habits and life
styles with special attention on dietetics habits and the
performance of an adequate physical activity
Herschel FIR counterparts of selected Ly-alpha emitters at z~2.2. Fast evolution since z~3 or missed obscured AGNs?
Ly-alpha emitters (LAEs) are seen everywhere in the redshift domain from
local to z~7. Far-infrared (FIR) counterparts of LAEs at different epochs could
provide direct clues on dust content, extinction, and spectral energy
distribution (SED) for these galaxies. We search for FIR counterparts of LAEs
that are optically detected in the GOODS-North field at redshift z~2.2 using
data from the Herschel Space Telescope with the Photodetector Array Camera and
Spectrometer (PACS). The LAE candidates were isolated via color-magnitude
diagram using the medium-band photometry from the ALHAMBRA Survey, ancillary
data on GOODS-North, and stellar population models. According to the fitting of
these spectral synthesis models and FIR/optical diagnostics, most of them seem
to be obscured galaxies whose spectra are AGN-dominated. From the analysis of
the optical data, we have observed a fraction of AGN or composite over source
total number of ~0.75 in the LAE population at z~2.2, which is marginally
consistent with the fraction previously observed at z=2.25 and even at low
redshift (0.2<z<0.45), but significantly different from the one observed at
redshift ~3, which could be compatible either with a scenario of rapid change
in the AGN fraction between the epochs involved or with a non detection of
obscured AGN in other z=2-3 LAE samples due to lack of deep FIR observations.
We found three robust FIR (PACS) counterparts at z~2.2 in GOODS-North. This
demonstrates the possibility of finding dust emission in LAEs even at higher
redshifts.Comment: 11 pages (including Appendices), 6 figures. Accepted for publication
in Astronomy & Astrophysics Letters (two references added
Revista de Vertebrados de la Estación Biológica de Doñana
Catálogo descriptivo de los anfibios y reptiles de CubaEvolución estacional de la comunidad de aves en un robledal de Sierra NevadaComposición de la comunidad de aves en pinares del Parque Nacional de Doñana (suroeste de España).Alimentación de la pagaza piconegra (Gelochelidon nilotica) en las marismas del GuadalquivirContaminación xenobiótica del Parque Nacional de Doñana. III. Residuos de insecticidas organoclorados, bifenilos policlorados y metales pesados en ciconiformesAlimentación de la lechuza común Tyto alba en la cuenca del Duero, EspañaEstudio de una población rural de (Mus musculus L.) I. La probabilidad de captura y la estima numéricLa reproducción en Gazella dorcasIncidencia del Nemátodo parásito Skrjabingylus Leuckart, 1842 sobre el Mustela en España.Desplazamientos de ungulados silvestres a través de una zona de ecotono en Doñana.Etograma de la cabra montés (Capra pyrenaica) y comparación con otras especies.Sobre comportamiento agresivo de Triturus marmoratus en época de celoEmbarrancamiento masivo de ejemplares de tortuga lad (Dermochelys coriacea L.) en las costas de Ceuta (España, norte de África)Sobre un ejemplar melánico de Podarcis hispanica (Steindachner, 1870)Nuevos datos sobre la distribución de cuatro especies de reptiles en la provincia de Cádiz.Algunos datos sobre la nidificación de Ciconia nigra L. en sierra Morena (S. España)Observación del halcón de Eleonor (Falco eleonorae) en el centro de EspañaNueva localidad de cría del pájaro moscón (Remiz pendulinus) en la Península IbéricaRegistro de aves en el sur de BoliviaNidificación del paiño de Madeira Oceanodroma castro (Harcourt, 1851) en las Islas Canarias.Observación primaveral de Phalaropus fulicarius L. en el SO de EspañaNuevos datos sobre la presencia del nóctulo gigante Nyctalus lasiopterus (Chiroptera, vespertilionidae) en EspañaNote sur l'alimentation de Martes martes a Menorca (Baleares).Peer reviewe
The Mice at play in the CALIFA survey: A case study of a gas-rich major merger between first passage and coalescence
We present optical integral field spectroscopy (IFS) observations of the
Mice, a major merger between two massive (>10^11Msol) gas-rich spirals NGC4676A
and B, observed between first passage and final coalescence. The spectra
provide stellar and gas kinematics, ionised gas properties and stellar
population diagnostics, over the full optical extent of both galaxies. The Mice
provide a perfect case study highlighting the importance of IFS data for
improving our understanding of local galaxies. The impact of first passage on
the kinematics of the stars and gas has been significant, with strong bars
likely induced in both galaxies. The barred spiral NGC4676B exhibits a strong
twist in both its stellar and ionised gas disk. On the other hand, the impact
of the merger on the stellar populations has been minimal thus far: star
formation induced by the recent close passage has not contributed significantly
to the global star formation rate or stellar mass of the galaxies. Both
galaxies show bicones of high ionisation gas extending along their minor axes.
In NGC4676A the high gas velocity dispersion and Seyfert-like line ratios at
large scaleheight indicate a powerful outflow. Fast shocks extend to ~6.6kpc
above the disk plane. The measured ram pressure and mass outflow rate
(~8-20Msol/yr) are similar to superwinds from local ULIRGs, although NGC4676A
has only a moderate infrared luminosity of 3x10^10Lsol. Energy beyond that
provided by the mechanical energy of the starburst appears to be required to
drive the outflow. We compare the observations to mock kinematic and stellar
population maps from a merger simulation. The models show little enhancement in
star formation during and following first passage, in agreement with the
observations. We highlight areas where IFS data could help further constrain
the models.Comment: 23 pages, 13 figures, accepted to A&A. A version with a complete set
of high resolution figures is available here:
http://www-star.st-and.ac.uk/~vw8/resources/mice_v8_astroph.pd
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