El uso de Twitter en las salas de redacción: redes sociales y newsmaking en la región sureste de Coahuila, México

The use of social network sites has increased in the newsmaking routines of media workers and journalists. Based on an online survey and a series of interviews, this paper shows some general trends about Internet usage and the way that some editors are handling Twitter as information source, in Southeastern Coahuila, México. Main results indicates that Internet is the most used media, and following Twitter allows them to keep track of potential breaking news, all sources verification procedures considered.El uso de las herramientas para la administración de redes sociales se está generalizando en algunas de las rutinas laborales de los trabajadores en los medios de comunicación, particularmente en los de carácter noticioso. Con base en una encuesta en línea y un conjunto de entrevistas, se presenta un panorama general del uso de Internet y de las redes sociales en una muestra no probabilística de reporteros, editores y dueños de medios de la región sureste de Coahuila; así como el tratamiento que un subgrupo de ellos le da a Twitter como fuente de información. Los principales resultados muestran que Internet es el medio al que dedican un mayor tiempo de consumo, y que Twitter es empleado como una herramienta que permite a los trabajadores de los medios, seguir asuntos de potencial interés periodístico, una vez que pasan por los procedimientos habituales de verificación de fuentes

The Ca II infrared triplet's performance as an activity indicator compared to Ca II H and K

Aims. A large number of Calcium Infrared Triplet (IRT) spectra are expected from the GAIA- and CARMENES missions. Conversion of these spectra into known activity indicators will allow analysis of their temporal evolution to a better degree. We set out to find such a conversion formula and to determine its robustness. Methods. We have compared 2274 Ca II IRT spectra of active main-sequence F to K stars taken by the TIGRE telescope with those of inactive stars of the same spectral type. After normalizing and applying rotational broadening, we subtracted the comparison spectra to find the chromospheric excess flux caused by activity. We obtained the total excess flux, and compared it to established activity indices derived from the Ca II H & K lines, the spectra of which were obtained simultaneously to the infrared spectra. Results. The excess flux in the Ca II IRT is found to correlate well with $R_\mathrm{HK}'$ and $R_\mathrm{HK}^{+}$, as well as $S_\mathrm{MWO}$, if the $B-V$-dependency is taken into account. We find an empirical conversion formula to calculate the corresponding value of one activity indicator from the measurement of another, by comparing groups of datapoints of stars with similar B-V.Comment: 16 pages, 15 figures. Accepted for publication in Astronomy & Astrophysic

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

Exploring the assessment of territorial potential for social innovation: an indicator system applied to a region in Ecuador

One of the key elements in territorial dynamics processes is Social Innovation since we can improve our regional sustainable systems from the relationship and participation among territorial agents. However, this concept is still poorly explored and does not currently have a commonly-agreed definition and a complete assessment system, based on which strategies for improvement might be designed to guarantee regional sustainability. As a result, it has limited capacity for contributing to development. In accordance with the above, the main aim of this article is to explore the concept of Social Innovation and to asses it, designing a system of indicators capable of measuring territorial potential for social innovation, applicable to any region and adapting to its specificities and necessities. This work also aims to use a case study application, using a Ecuadorian region, to design an indicator assessment tool for social innovation, which integrates the main Social Innovation dimensions. This article makes contribution to the international debate on Social Innovation since it offers real input, potentially encouraging social change and the improvement of society’s wellbeing.27 página

Exploring the assessment of territorial potential for social innovation: an indicator system applied to a region in Ecuador

One of the key elements in territorial dynamics processes is Social Innovation since we can improve our regional sustainable systems from the relationship and participation among territorial agents. However, this concept is still poorly explored and does not currently have a commonly-agreed definition and a complete assessment system, based on which strategies for improvement might be designed to guarantee regional sustainability. As a result, it has limited capacity for contributing to development. In accordance with the above, the main aim of this article is to explore the concept of Social Innovation and to asses it, designing a system of indicators capable of measuring territorial potential for social innovation, applicable to any region and adapting to its specificities and necessities. This work also aims to use a case study application, using a Ecuadorian region, to design an indicator assessment tool for social innovation, which integrates the main Social Innovation dimensions. This article makes contribution to the international debate on Social Innovation since it offers real input, potentially encouraging social change and the improvement of society’s wellbeing

Recovering the properties of high redshift galaxies with different JWST broad-band filters

Imaging with the James Webb Space Telescope (JWST) will allow for observing the bulk of distant galaxies at the epoch of reionisation. The recovery of their properties, such as age, color excess E(B-V), specific star formation rate (sSFR) and stellar mass, will mostly rely on spectral energy distribution fitting, based on the data provided by JWST's two imager cameras, namely the Near Infrared Camera (NIRCam) and the Mid Infrared Imager (MIRI). In this work we analyze the effect of choosing different combinations of NIRCam and MIRI broad-band filters, from 0.6 {\mu}m to 7.7 {\mu}m, on the recovery of these galaxy properties. We performed our tests on a sample of 1542 simulated galaxies, with known input properties, at z=7-10. We found that, with only 8 NIRCam broad-bands, we can recover the galaxy age within 0.1 Gyr and the color excess within 0.06 mag for 70% of the galaxies. Besides, the stellar masses and sSFR are recovered within 0.2 and 0.3 dex, respectively, at z=7-9. Instead, at z=10, no NIRCam band traces purely the {\lambda}> 4000 {\AA} regime and the percentage of outliers in stellar mass (sSFR) increases by > 20% (> 90%), in comparison to z=9. The MIRI F560W and F770W bands are crucial to improve the stellar mass and the sSFR estimation at z=10. When nebular emission lines are present, deriving correct galaxy properties is challenging, at any redshift and with any band combination. In particular, the stellar mass is systematically overestimated in up to 0.3 dex on average with NIRCam data alone and including MIRI observations improves only marginally the estimation.Comment: 21 pages, 11 figures, 4 tables. Accepted for publication at the ApJ

In Silico Modelling to Assess the Electrical and Thermal Disturbance Provoked by a Metal Intracoronary Stent during Epicardial Pulsed Electric Field Ablation

[EN] Background: Pulsed Electric Field (PEF) ablation has been recently proposed to ablate cardiac ganglionic plexi (GP) aimed to treat atrial fibrillation. The effect of metal intracoronary stents in the vicinity of the ablation electrode has not been yet assessed. Methods: A 2D numerical model was developed accounting for the different tissues involved in PEF ablation with an irrigated ablation device. A coronary artery (with and without a metal intracoronary stent) was considered near the ablation source (0.25 and 1 mm separation). The 1000 V/cm threshold was used to estimate the PEF-zone¿. Results: The presence of the coronary artery (with or without stent) distorts the E-field distribution, creating hot spots (higher E-field values) in the front and rear of the artery, and cold spots (lower E-field values) on the sides of the artery. The value of the E-field inside the coronary artery is very low (~200 V/cm), and almost zero with a metal stent. Despite this distortion, thePEF-zone contour is almost identical with and without artery/stent, remaining almost completely confined within the fat layer in any case. The mentioned hot spots of E-field translate into a moderate temperature increase (<48 _C) in the area between the artery and electrode. These thermal side effects are similar for pulse intervals of 10 and 100 _s. Conclusions: The presence of a metal intracoronary stent near the ablation device during PEF ablation simply `amplifies¿ the E-field distortion already caused by the presence of the vessel. This distortion may involve moderate heating (<48 _C) in the tissue between the artery and ablation electrode without associate Background: Pulsed Electric Field (PEF) ablation has been recently proposed to ablate cardiac ganglionic plexi (GP) aimed to treat atrial fibrillation. The effect of metal intracoronary stents in the vicinity of the ablation electrode has not been yet assessed. Methods: A 2D numerical model was developed accounting for the different tissues involved in PEF ablation with an irrigated ablation device. A coronary artery (with and without a metal intracoronary stent) was considered near the ablation source (0.25 and 1 mm separation). The 1000 V/cm threshold was used to estimate the `PEF-zone¿. Results: The presence of the coronary artery (with or without stent) distorts the E-field distribution, creating hot spots (higher E-field values) in the front and rear of the artery, and cold spots (lower E-field values) on the sides of the artery. The value of the E-field inside the coronary artery is very low (~200 V/cm), and almost zero with a metal stent. Despite this distortion, the PEF-zone contour is almost identical with and without artery/stent, remaining almost completely confined within the fat layer in any case. The mentioned hot spots of E-field translate into a moderate temperature increase (<48 _C) in the area between the artery and electrode. These thermal side effects are similar for pulse intervals of 10 and 100 _s. Conclusions: The presence of a metal intracoronary stent near the ablation device during PEF ablation simply `amplifies¿ the E-field distortion already caused by the presence of the vessel. This distortion may involve moderate heating (<48 _C) in the tissue between the artery and ablation electrode without associated thermal damage. d thermal damage.This research was funded by Government of Ireland, Disruptive Technology Innovation Fund (DTIF), grant number DT20180123, and Spanish MCIN/AEI/10.13039/501100011033, grant RTI2018-094357-B-C21.González-Suárez, A.; Pérez, JJ.; O Brien, B.; Elahi, A. (2022). In Silico Modelling to Assess the Electrical and Thermal Disturbance Provoked by a Metal Intracoronary Stent during Epicardial Pulsed Electric Field Ablation. Journal of Cardiovascular Development and Disease. 9(12):1-11. https://doi.org/10.3390/jcdd912045811191

KMOS LENsing Survey (KLENS) : morpho-kinematic analysis of star-forming galaxies at z∼2z \sim 2

We present results from the KMOS lensing survey-KLENS which is exploiting gravitational lensing to study the kinematics of 24 star forming galaxies at $1.4<z<3.5$ with a median mass of $\rm log(M_\star/M_\odot)=9.6$ and median star formation rate (SFR) of $\rm 7.5\,M_\odot\,yr^{-1}$. 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, $\sigma_0$, as a function of the redshift, $z$, and stellar mass, $\rm M_\star$, assuming galaxies in quasi-equilibrium (Toomre Q parameter equal to 1). From the $z-\sigma_0$ relation, we find that the redshift evolution of the velocity dispersion is mostly expected for massive galaxies ($\rm log(M_\star/M_\odot)>10$). We derive a $\rm M_\star-\sigma_0$ 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 $0<z<3.5$ appear to follow this relation, except at higher redshift ($z>2$), where we observe higher velocity dispersions for low masses ($\rm log(M_\star/M_\odot)\sim 9.6$) and lower velocity dispersions for high masses ($\rm log(M_\star/M_\odot)\sim 10.9$) than expected. This discrepancy could, for instance, suggest that galaxies at high-$z$ 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

Modificación hidrotérmica del almidón de yuca para su empleo como estabilizador de helados

En el trabajo se desarrolla un procedimiento de modificación física de almidón nativo de yuca a través de un tratamiento hidrotérmico en la zona previa a la gelatinización, de la cual no existen reportes de experimentación. El objetivo es determinar la influencia de las principales variables del proceso sobre el comportamiento reológico, con el propósito de ser empleado como estabilizador en la Industria heladera. Se alcanzaron buenos resultados reológicos con una concentración de 6% p/p de almidón nativo a 56 0C. El material obtenido se usó en formulaciones de helados, sustituyendo parte de los productos convencionales con efectos muy positivos en cuanto a la evaluación sensorial y el índice de aireación. Los resultados alcanzados permiten establecer perspectivas para el empleo de almidones modificados de yuca cuyo tratamiento hidrotérmico en la zona previa a la gelatinización ofrece efectos positivos, como estabilizante de suspensiones acuosas, similares a los que se alcanzan con almidones pregelatinizados, además con la ventaja de obtener el producto modificado con mayor facilidad