3,927 research outputs found
Immigració a Catalunya als anys noranta, quelcom de nou?
This brief article pretends to answer the following question:
Which are the implications of foreign immigration in Catalonia? In order to
do so, it deals with a supposed specificity of an immigration model,
different to other autonomous regions in Spain, and even in the framework
of Southern Europe. In an introductory style, various proposals for
integration policies are examined.Este breve artÃculo pretende responder a la pregunta sobre
qué implica la inmigración extranjera en Cataluña, considerando si existe
un modelo de inmigración diferente al de otras comunidades autonómas
españolas e incluso viendo su especificidad en un modelo del Sur de
Europa. A modo introductorio analiza las propuestas elaboradas respecto
a una polÃtica de integración social
Noise characterization of an atomic magnetometer at sub-millihertz frequencies
Noise measurements have been carried out in the LISA bandwidth (0.1 mHz to
100 mHz) to characterize an all-optical atomic magnetometer based on nonlinear
magneto-optical rotation. This was done in order to assess if the technology
can be used for space missions with demanding low-frequency requirements like
the LISA concept. Magnetometry for low-frequency applications is usually
limited by noise and thermal drifts, which become the dominant
contributions at sub-millihertz frequencies. Magnetic field measurements with
atomic magnetometers are not immune to low-frequency fluctuations and
significant excess noise may arise due to external elements, such as
temperature fluctuations or intrinsic noise in the electronics. In addition,
low-frequency drifts in the applied magnetic field have been identified in
order to distinguish their noise contribution from that of the sensor. We have
found the technology suitable for LISA in terms of sensitivity, although
further work must be done to characterize the low-frequency noise in a
miniaturized setup suitable for space missions.Comment: 11 pages, 12 figure
Lagged and instantaneous dynamical influences related to brain structural connectivity
Contemporary neuroimaging methods can shed light on the basis of human neural
and cognitive specializations, with important implications for neuroscience and
medicine. Different MRI acquisitions provide different brain networks at the
macroscale; whilst diffusion-weighted MRI (dMRI) provides a structural
connectivity (SC) coincident with the bundles of parallel fibers between brain
areas, functional MRI (fMRI) accounts for the variations in the
blood-oxygenation-level-dependent T2* signal, providing functional connectivity
(FC).Understanding the precise relation between FC and SC, that is, between
brain dynamics and structure, is still a challenge for neuroscience. To
investigate this problem, we acquired data at rest and built the corresponding
SC (with matrix elements corresponding to the fiber number between brain areas)
to be compared with FC connectivity matrices obtained by 3 different methods:
directed dependencies by an exploratory version of structural equation modeling
(eSEM), linear correlations (C) and partial correlations (PC). We also
considered the possibility of using lagged correlations in time series; so, we
compared a lagged version of eSEM and Granger causality (GC). Our results were
two-fold: firstly, eSEM performance in correlating with SC was comparable to
those obtained from C and PC, but eSEM (not C nor PC) provides information
about directionality of the functional interactions. Second, interactions on a
time scale much smaller than the sampling time, captured by instantaneous
connectivity methods, are much more related to SC than slow directed influences
captured by the lagged analysis. Indeed the performance in correlating with SC
was much worse for GC and for the lagged version of eSEM. We expect these
results to supply further insights to the interplay between SC and functional
patterns, an important issue in the study of brain physiology and function.Comment: Accepted and published in Frontiers in Psychology in its current
form. 27 pages, 1 table, 5 figures, 2 suppl. figure
Constructing networks of defects with scalar fields
We propose a new way to build networks of defects. The idea takes advantage
of the deformation procedure recently employed to describe defect structures,
which we use to construct networks, spread from small rudimentary networks that
appear in simple models of scalar fields.Comment: 5 pages, 4 figures, version with new title, motivations and
references, to appear in PL
Perspectives on flow biocatalysis: the engine propelling enzymatic reactions
Flow biocatalysis has emerged as an empowering tool to boost the potential of enzymatic reactions towards more automatized, sustainable, and generally efficient synthetic processes. In the last fifteen years, the increasing number of biocatalytic transformations carried out in continuous flow exemplified the benefits that this technology can bring to incorporate biocatalysis into industrial operations. This perspective aims to capture in a nutshell the available methodologies for flow biocatalysis as well as to discuss the current limitations and the future directions in this field
A paradox in the approximation of Dirichlet control problems in curved domains
In this paper, we study the approximation of a Dirichlet control problem governed by an elliptic equation defined on a curved domain Ω. To solve this problem numerically, it is usually necessary to approximate Ω by a (typically polygonal) new domain Ωh. The difference between the solutions of both infinite-dimensional control problems, one formulated in Ω and the second in Ωh, was studied in [E. Casas and J. Sokolowski, SIAM J. Control Optim., 48 (2010), pp. 3746–3780], where an error of order O(h) was proved. In [K. Deckelnick, A. G¨unther, and M. Hinze, SIAM J. Control Optim., 48 (2009), pp. 2798–2819], the numerical approximation of the problem defined in Ω was considered. The authors used a finite element method such that Ωh was the polygon formed by the union of all triangles of the mesh of parameter h. They proved an error of order O(h3/2) for the difference between continuous and discrete optimal controls. Here we show that the estimate obtained in [E. Casas and J. Sokolowski, SIAM J. Control Optim., 48 (2010), pp. 3746–3780] cannot be improved, which leads to the paradox that the numerical solution is a better approximation of the optimal control than the exact one obtained just by changing the domain from Ω to Ωh
Cortisol en saliva como indicador de estrés en porcino
The first aim of the present study was to evaluate the measure ‘salivary cortisol’ as a non invasive Animal Welfare indicator for fattening pigs. The second objective was to assess the effect of a commercial farm routine procedure (weighing) in the HPA axis activation. The effect of the breading line (breeding line A and B), the sex, the date and hour of the sampling, and the different flooring systems used in the housing were taken into account. Two types of partly-slatted housing were used, continuous concrete floor and concrete slat (CC) and continuous solid floor of concreted recovered with epoxy resin and metallic slat (RM). Firstly, salivary control samples were taken in 1 pig per pen on three different days during fattening (morning and afternoon) for a total of 96 samples. Secondly, another salivary cortisol sample was taken after weighing each pig, 0h, 1h and 2h after weighing (stressful situation) near the end of fattening, in 3 pigs per pen, for a total of 144 samples. There were no differences in baseline cortisol levels for pigs on either flooring but, after the weighing, the cortisol level of the animals housed in the RM flooring were significantly lower (p<0,01) than the cortisol level of the animals housed in the CC flooring, and showed a normal decreasing tendency whereas the level of cortisol of animals housed in the CC flooring showed a rising tendencyEl primer objetivo de este estudio fue evaluar la medida ‘cortisol en saliva’ como un indicador no invasivo del nivel de Bienestar Animal en cerdos en cebo. El segundo objetivo fue evaluar el efecto que un procedimiento rutinario, al que los animales se ven sometidos en condiciones comerciales, como es el pesaje, tiene en la activación del eje hipotálamo-pituitaria-adrenal (HPA). Se tuvieron en cuenta los posibles efectos del tipo genético (lÃnea comercial A y B), el sexo, la fecha y la hora de toma de muestras, y el tipo de suelo en el que se alojaron los animales. Se usaron dos tipos de suelo, el primero constaba de zona continua de hormigón y slats de hormigón (CC) y el segundo de zona continua de hormigón recubierta de resina epoxi y slats metálicos (MS). En primer lugar, se tomaron muestras control de saliva, de un cerdo de cada box de las 4 salas, durante la mañana y la tarde, en 3 dÃas no consecutivos, con un total de 96 muestras. En segundo lugar se tomaron muestras de saliva inmediatamente después del pesaje, a la hora y a las 2 horas, con un total de 144 muestras. No se encontraron diferencias significativas en el nivel de cortisol basal; en cambio, después del pesaje, el nivel de cortisol fue significativamente menor en los animales alojados en suelo RM (p<0,01) que en los animales alojados en suelo CC. El nivel de cortisol tras el pesaje en los animales alojados en suelo RM mostró una tendencia normal decreciente con el paso de las horas, mientras que, el nivel de cortisol aumentó con el paso de las horas para los animales alojados en suelo CC
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