5,081 research outputs found
Análisis Psicofisiológico de Estímulos Sonoros
Electroencephalography signals (EEG) has captured the general interest of the scientific community; nowadays, the most part of the investigations of the topic are focused on the emotional psychophysiological effect that this kind of signals are able to show according different types of stimuli; therefore, this document shows the analysis of different sets of EEG signals, captured by NeuroSky headset, under the stimulation produced by emotional content sounds from the IADS (International Affective Digital Sounds); furthermore, some EEG signals from the "DREAMER" dataset were also analyzed. From this document was mainly concluded that there was a corresponsive result between subjective and objective data as valence and arousal values were corresponsive with EEG frequency bands; furthermore, for DREAMER set, electrodes of the right hemisphere were the ones with more energy.Las señales de electroencefalografía (EEG) han captado el interés de la comunidad científica; actualmente, la mayoría de las investigaciones están enfocadas a cómo estas señales reflejan la respuesta psicofisiológica de las personas, en términos emocionales, respecto a diferentes estímulos; por esta razón, en este documento se presenta el análisis de señales de EEG captadas por el headset de NeuroSky ante estímulos sonoros con contenido emocional provenientes de la IADS (International Affective Digital Sounds); además, se analizaron algunas señales del dataset de EEG “DREAMER”. De este desarrollo se llegó a que hay una correspondencia entre los valores de Valencia y Arousal con las bandas de frecuencia de EEG, observando además que, para el caso del DREAMER, los electrodos correspondientes al hemisferio derecho presentaban la mayoría de la energía en el cerebro
Effects of a thermal inversion experiment on STEM students learning and application of damped harmonic motion
There are diverse teaching methodologies to promote both collaborative and
individual work in undergraduate physics courses. However, few educational
studies seek to understand how students learn and apply new knowledge through
open-ended activities that require mathematical modeling and experimentation
focused on environmental problems. In this work, we propose a novel home
experiment to simulate the dynamics of a particulate under temperature
inversion and model it as damped harmonic motion. Twenty six first year
students enrolled in STEM majors answered six qualitative questions after
designing and developing the experiment. These questions helped analyze the
students epistemological beliefs about their learning process of physics topics
and its applications. Results showed that this type of open-ended experiments
could facilitate the students understanding of physics phenomena. In addition,
this experiment showed that it could help physics professors to promote
students epistemological development by giving their students the opportunity
to search for different sources of knowledge and becoming self-learners instead
of looking at the professor as the epistemological authority. At the end,
students described this activity as a positive experience that helped them
realize alternative ways to apply physics topics in different contexts of their
environment.Comment: 23 pages, 5 figure
Determination of Optimal Grazing Management for Dairy Cows in Galicia (Spain) Using a Decision Support System
GRAZEMORE is a decision support system (DSS) oriented to evaluate dairy grazing management decisions on pasture growth and milk production. The system integrates a herbage growth model (Barrett et al., 2003) and a herbage intake model (Delagarde et al., 2004) and has been validated in several EU countries. The objective of this work was to use this DSS to determine optimal grazing management of dairy cows at three supplementation levels and three grazing management strategies under Galician conditions
External Validation in Northwest Spain of a Decision Support System for Grazing Dairy Cows (Grazemore)
A model to predict intake and milk production of cows on grazed grass (Grazemore) was developed (Mayne et al., 2004) for farmers to increase reliance on the grassland resources of the farm and reduce the tendency towards intensive dairy production in most countries of the Atlantic Arc of Europe (González, 2003). Climatic conditions and fertiliser use is the basis of the herbage growth model, but under practical conditions the estimation of the nutrient supply to cows is much affected by management, number of cows and the area of each paddock grazed. The intake capacity of the animal and the ingestibility of the feeds drive the herbage intake model, considering cow characteristics, pregnancy, body condition and stage of lactation, as well as supplementation (concentrates and forages) at grazing. The decision support system (DSS) fits both models to farm conditions and it is now at the farm validation phase in the six EU countries involved
Módulo online de cinemática como soporte a la enseñanza semipresencial de la Física en Ingeniería
Las nuevas tecnologías en materia de información y comunicación nos ofrecen las oportunidades para un mayor aprovechamiento de las herramientas y recursos, que permita mejorar el proceso de enseñanza-aprendizaje. Aprovechando las nuevas oportunidades que ofrecen medios como internet se diseñó y desarrolló un sistema hipermedial (website) denominado: programa SEHCP (Software Educativo Hipermedia Cinemática de la Partícula) como soporte al proceso de enseñanza-aprendizaje del tema Cinemática de la Partícula. El software fue utilizado por una muestra representativa de los tipos de destinatarios para los que fue diseñado y la consiguiente evaluación diagnóstica; la muestra estuvo conformada por alumnos de la asignatura Física Mecánica y alumnos del Curso Introductorio de la Facultad de Ingeniería de la Universidad de Carabobo-Venezuela
KMOS LENsing Survey (KLENS) : morpho-kinematic analysis of star-forming galaxies at
We present results from the KMOS lensing survey-KLENS which is exploiting
gravitational lensing to study the kinematics of 24 star forming galaxies at
with a median mass of and median
star formation rate (SFR) of . We find that 25% of
these low-mass/low-SFR galaxies are rotation dominated, while the majority of
our sample shows no velocity gradient. When combining our data with other
surveys, we find that the fraction of rotation dominated galaxies increases
with the stellar mass, and decreases for galaxies with a positive offset from
the main sequence. We also investigate the evolution of the intrinsic velocity
dispersion, , as a function of the redshift, , and stellar mass,
, assuming galaxies in quasi-equilibrium (Toomre Q parameter equal
to 1). From the relation, we find that the redshift evolution of
the velocity dispersion is mostly expected for massive galaxies (). We derive a relation, using
the Tully-Fisher relation, which highlights that a different evolution of the
velocity dispersion is expected depending on the stellar mass, with lower
velocity dispersions for lower masses, and an increase for higher masses,
stronger at higher redshift. The observed velocity dispersions from this work
and from comparison samples spanning appear to follow this relation,
except at higher redshift (), where we observe higher velocity dispersions
for low masses () and lower velocity
dispersions for high masses () than
expected. This discrepancy could, for instance, suggest that galaxies at
high- do not satisfy the stability criterion, or that the adopted
parametrisation of the specific star formation rate and molecular properties
fail at high redshift.Comment: Accepted for publication in A&A, 21 pages, 10 figure
Stabilized Schemes for the Hydrostatic Stokes Equations
Some new stable finite element (FE) schemes are presented for the hydrostatic Stokes
system or primitive equations of the ocean. It is known that the stability of the mixed formulation ap-
proximation for primitive equations requires the well-known Ladyzhenskaya–Babuˇska–Brezzi condi-
tion related to the Stokes problem and an extra inf-sup condition relating the pressure and the vertical
velocity.
The main goal of this paper is to avoid this extra condition by adding a residual stabilizing term to the
vertical momentum equation. Then, the stability for Stokes-stable FE combinations is extended to
the primitive equations and some error estimates are provided using Taylor–Hood P2 –P1 or miniele-
ment (P1 +bubble)–P1 FE approximations, showing the optimal convergence rate in the P2 –P1 case.
These results are also extended to the anisotropic (nonhydrostatic) problem. On the other hand,
by adding another residual term to the continuity equation, a better approximation of the vertical
derivative of pressure is obtained. In this case, stability and error estimates including this better
approximation are deduced, where optimal convergence rate is deduced in the (P 1 +bubble)–P1 case.
Finally, some numerical experiments are presented supporting previous results
First principles determination of some static and dynamic properties of the liquid 3d transition metals near melting
Producción CientíficaWe report an ab initio molecular dynamics simulation study of several static and dynamic properties of the liquid 3d transition metals. The calculated static structure factors show qualitative agreement with the available experimental data, and its second peak displays an asymmetric shape which suggests a signi1cant local icosahedral short-range order. The dynamical structure reveals propagating density 2uctuations whose dispersión relation has been evaluated; moreover, its long wavelength limit is compatible with their respective experimental sound velocity. Results are reported for the longitudinal and transverse current spectral functions as well as for the respective dispersion relations. We also analyze the possible appearance of transverse-like low-energy excitations in the calculated dynamic structure factors. Several transport coeWcients have been evaluated and
compared with the available experimental data.Junta de Castilla y León (Ref. project VA124G18)Ministerio de Economía, Industria y Competitividad (Project PGC2018-093745-B-I00) and FEDE
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