7,089 research outputs found
Independent AND-parallel implementation of narrowing
We present a parallel graph narrowing machine, which is
used to implement a functional logic language on a shared memory multiprocessor. It is an extensión of an abstract machine for a purely functional language. The result is a programmed graph reduction machine which integrates the mechanisms of unification, backtracking, and independent
and-parallelism. In the machine, the subexpressions of an expression can run in parallel. In the case of backtracking, the structure of an expression is used to avoid the reevaluation of subexpressions as far as possible. Deterministic computations are detected. Their results are maintained and need not be reevaluated after backtracking
Modelling the Degree of Emotional Concern: COVID-19 Response in Social Media
The massive impact caused by the COVID-19 pandemic has left no one indifferent, becoming an unprecedented challenge. The use of protections such as sanitary masks has become
increasingly common, restrictions in our daily lives, such as social distancing or confinements,
have had serious consequences on the economy and our welfare state. Although the measures
imposed throughout the world follow the same pattern, they have been applied with different criteria
depending on the country. Over extended periods of time, people tend to change their perception of
an event and its magnitude, or in other words, they stop being so concerned despite the seriousness
of the matter. In this paper, we introduce a new metric to quantify the degree of emotional concern of
people being affected by a topic, and we confirm how populations from different countries follow
this trend of downplaying the effect of the pandemic and reach a state of indifference. To do this,
we propose a method to analyze the social media stream over time extracting the different emotional
states from the Russel Circumplex plane and computing the shifting created by the tragic event—the
pandemic. We complete this metric by incorporating searching behavior to reflect not only push
contents but also pull inquiries. The resulting metric establishes a relationship between the pandemic
and the emotional response by defining the degree of Emotional Concern. Although the method
can be applied to any location with a significant and varied amount of geo-localized social media
streams, the scope of this paper covers the most representative cities in Europe
Algunos resultados recientes en polinomios ortogonales de Sobolev
En este trabajo expondré algunos resultados recientes acerca de polinomios ortogonales con respecto a un producto escalar no estándar que involucra medidas de soporte no acotado
Las bibliotecas universitarias y los Programas de evaluación de la ANECA: una propuesta para la Universidad de AlmerÃa: trabajo para el Curso Selectivo de Promoción Interna A1 de la Universidad de AlmerÃa
Análisis de los Programas de la ANECA relativos a la evaluación de las titulaciones y a la evaluación del profesorado a fin de identificar los requisitos indicados para las bibliotecas universitarias y determinar oportunidades y acciones de mejora para la Biblioteca de la Universidad de AlmerÃa
Synthesis, reactivity and computational studies of ir complexes bearing terphenyl phosphine ligands.
Efectos de un entrenamiento de fuerza de corta duración sobre la capacidad de salto vertical en jugadores de voleibol de elite durante la temporada
The aim of this study was to describe the effects of 6 weeks of combined strength and jump training which incorporated modera
te loads and
high intensity contractions on the vertical jump ability (VJ), loaded jumps and velocity of execution in full squat in a group
of professional male
volleyball players during the competition season. It was hypothesized that the VJ improved by cross combined strength and jump
training both
characterized by high velocity of execution (>1m/s). The participants in this study were twelve players who competed in the fir
st national division of
the Spanish National League during the 2011-2012 season. The neuromuscular performance was estimated by unloaded (CMJ) and load
ed
countermovement jumps (CMJ
loaded
) height (cm); and by velocity of displacement in the concentric phase of full squat (FS) (m/s). There was a
significant increase in CMJ and CMJ
loaded
after 6-week of training (5%, p<0.01; and 5.7%, p<0.05; respectively). These changes were accompanied by
a small and moderate value of Effect Size (0.47, and 0.67; respectively). No significant differences were observed for velocity
of displacement in FS.
The linear correlation analysis showed a single moderate correlation statistically significant between the changes in CMJ-CMJ
loaded
and CMJ-FS (r=0.62
and r=0.59, p<0.05; respectively). Albeit speculative, our results suggest that the use of moderate loads could be enough to im
prove the vertical jump
performance, since in our study a load equivalent to 60% 1RM in the FS was not exceeded and jumping exercises were performed wi
th light loads.El objetivo de este estudio fue describir los efectos de 6 semanas de entrenamiento combinado de fuerza y salto, el cual incorpora cargas
moderadas e intensidades de contracción altas, sobre la capacidad de salto vertical, saltos con cargas y la velocidad de ejecución en el ejercicio de sentadilla
en un grupo de jugadores profesionales de voleibol durante la temporada de competición. Se estableció la hipótesis de que el sa
lto vertical mejoro por el
uso combinado de entrenamiento de fuerza y salto, ambos caracterizados por una alta velocidad de ejecución (>1m/s). El rendimie
nto neuromuscular fue
estimado por la altura (cm) del salto sin cargas (CMJ), salto con cargas (CMJ
loaded
), y por la velocidad (m/s) de desplazamiento en la fase concéntrica en
la sentadilla completa (FS). Tuvo lugar un incremento significativo en CMJ y CMJ
loaded
después de 6 semanas de entrenamientos (5%, p<0.01; y 5.7%,
p<0.05; respectivamente). Estos cambios fueron acompañados por un valor de Tamaño del Efecto pequeño y moderado (0.47, and 0.67
; respectivamente). No se observaron diferencias significativas en la velocidad de desplazamiento en FS. El análisis de correlación lineal
mostró una correlación
moderada estadÃsticamente significativa entre los cambios en CMJ-CMJ
loaded
y CMJ-FS (r=0.62; y r=0.59, p<0.05; respectivamente). Aunque algo
especulativo, nuestros resultados sugieren que el uso de cargas moderadas podrÃa ser suficiente para mejorar el rendimiento del
salto vertical, ya que en
nuestro estudio no se excedió una carga equivalente al 60% de 1RM en FS y los ejercicios de saltos también fueron realizados con cargas ligeras
One- and two-photon scattering from generalized V-type atoms
The one- and two-photon scattering matrix S is obtained analytically for a
one-dimensional waveguide and a point-like scatterer with N excited levels
(generalized V -type atom). We argue that the two-photon scattering matrix
contains sufficient information to distinguish between different level
structures which are equivalent for single-photon scattering, such as a V -atom
with N = 2 excited levels and two two-level systems. In particular, we show
that the scattering with the V -type atom exhibits a destructive interference
effect leading to two-photon Coupled-Resonator-Induced Transparency, where the
nonlinear part of the two-photon scattering matrix vanishes when each incident
photon fulfills a single-photon condition for transparency
Single photons by quenching the vacuum
Heisenberg's uncertainty principle implies that the quantum vacuum is not
empty but fluctuates. These fluctuations can be converted into radiation
through nonadiabatic changes in the Hamiltonian. Here, we discuss how to
control this vacuum radiation, engineering a single-photon emitter out of a
two-level system (2LS) ultrastrongly coupled to a finite-band waveguide in a
vacuum state. More precisely, we show the 2LS nonlinearity shapes the vacuum
radiation into a nonGaussian superposition of even and odd cat states. When the
2LS bare frequency lays within the band gaps, this emission can be well
approximated by individual photons. This picture is confirmed by a
characterization of the ground and bound states, and a study of the dynamics
with matrix product states and polaron Hamiltonian methods.Comment: 9 pages, 10 figure
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