IAA : Información y actualidad astronómica (44)

Sumario : La importancia de los cometas.-- Gamow, Alpher y el ylem.-- DECONSTRUCCIÓN Y otros ENSAYOS. El universo molecular.-- EL “MOBY DICK” DE... Alberto Molino (IAG).-- CIENCIA EN HISTORIAS...Tras la estela de Plateau.-- ACTUALIDAD.-- SALA LIMPIA.-- CIENCIA: PILARES E INCERTIDUMBRES. Explosiones de rayos gamma.N

Enhancement of synchronized vortex lattice motion in hybrid magnetic/amorphous superconducting nanostructures

Superconducting a-Mo_(3)Si and Nb films have been grown on arrays of Ni nanodots. We have studied the vortex lattice dynamics close to critical temperatures. Different vortex lattice configurations are obtained with the same array unit cell. These different vortex lattices occur at matching conditions between the vortex lattice and the array unit cell. The interplay between the random intrinsic pinning of the superconducting films and the periodic pinning of the array govern the vortex lattice configurations. Different vortex lattice configurations and enhancement of synchronized vortex lattice motion are obtained by increasing the periodic pinning strength and decreasing the random pinning strength

The OTELO survey. A case study of [O III]4959,5007 emitters at <z> = 0.83

The OTELO survey is a very deep, blind exploration of a selected region of the Extended Groth Strip and is designed for finding emission-line sources (ELSs). The survey design, observations, data reduction, astrometry, and photometry, as well as the correlation with ancillary data used to obtain a final catalogue, including photo-z estimates and a preliminary selection of ELS, were described in a previous contribution. Here, we aim to determine the main properties and luminosity function (LF) of the [O III] ELS sample of OTELO as a scientific demonstration of its capabilities, advantages, and complementarity with respect to other surveys. The selection and analysis procedures of ELS candidates obtained using tunable filter (TF) pseudo-spectra are described. We performed simulations in the parameter space of the survey to obtain emission-line detection probabilities. Relevant characteristics of [O III] emitters and the LF([O III]), including the main selection biases and uncertainties, are presented. A total of 184 sources were confirmed as [O III] emitters at a mean redshift z=0.83. The minimum detectable line flux and equivalent width (EW) in this ELS sample are $\sim$5 $\times$ 10$^{-19}$ erg s$^{-1}$ cm$^{2}$ and $\sim$6 \AA, respectively. We are able to constrain the faint-end slope ($\alpha = -1.03\pm0.08$) of the observed LF([O III]) at z=0.83. This LF reaches values that are approximately ten times lower than those from other surveys. The vast majority (84\%) of the morphologically classified [O III] ELSs are disc-like sources, and 87\% of this sample is comprised of galaxies with stellar masses of M$_\star$ $<$ 10$^{10}$ M$_{\odot}$.Comment: v1: 16 pages, 6 figures. Accepted in Astronomy \& Astrophysics. v2: Author added in metadat

Silica-gelatin hybrid sol-gel coatings: A proteomic study with biocompatibility implications

Osseointegration, including the foreign body reaction to biomaterials, is an immune‐modulated, multifactorial, and complex healing process in which various cells and mediators are involved. The buildup of the osseointegration process is immunological and inflammation‐driven, often triggered by the adsorption of proteins on the surfaces of the biomaterials and complement activation. New strategies for improving osseointegration use coatings as vehicles for osteogenic biomolecules delivery from implants. Natural polymers, such as gelatin, can mimic Collagen I and enhance the biocompatibility of a material. In this experimental study, two different base sol–gel formulations and their combination with gelatin were applied as coatings on sandblasted, acid‐etched titanium substrates, and their biological potential as osteogenic biomaterials was tested. We examined the proteins adsorbed onto each surface and their in vitro and in vivo effects. In vitro results showed an improvement in cell proliferation and mineralization in gelatin‐containing samples. In vivo testing showed the presence of a looser connective tissue layer in those coatings with substantially more complement activation proteins adsorbed, especially those containing gelatin. Vitronectin and FETUA, proteins associated with mineralization process, were significantly more adsorbed in gelatin coatings

Chatbots in social networks for the timely support of university students with attention-deficit/hyperactivity disorder symptoms

Se estima que la prevalencia del trastorno por déficit de atención con hiperactividad (TDAH) en estudiantes universitarios es del 2 al 4.5% pero varía de una universidad a otra. Sin embargo, muchos estudiantes evitan acudir a tratamiento por ansiedad, temor al estigma, porque sienten que los problemas de los otros son mayores que los propios o bien desconocen la sintomatología del TDAH. En esta contribución se presenta el diseño e implementación de un chatbot para la aplicación del cuestionario Adult Self Report Scale-Versión 1.1 (EATDAH-A) así como los resultados de la aplicación del mismo y la opinión de los usuarios en cuanto a su utilidad y experiencia como usuario.It is estimated that the prevalence of Attention Deficit Hyperactivity Disorder (ADHD) in university students is from 2 to 4.53% but varies from one university to another. However, many students avoid therapies due to grief, nervousness, fear, or because they feel that the problems of others are greater than their own or they are unaware of the symptoms of ADHD. This contribution presents the design and implementation of a chatbot for the application of the Adult Self Report Scale-Version 1.1 (ASRS v1.1) questionnaire as well as the results of its application and the opinion of users regarding its usefulness and user experience.Facultad de Informátic

Chatbots in social networks for the timely support of university students with attention-deficit/hyperactivity disorder symptoms

Se estima que la prevalencia del trastorno por déficit de atención con hiperactividad (TDAH) en estudiantes universitarios es del 2 al 4.5% pero varía de una universidad a otra. Sin embargo, muchos estudiantes evitan acudir a tratamiento por ansiedad, temor al estigma, porque sienten que los problemas de los otros son mayores que los propios o bien desconocen la sintomatología del TDAH. En esta contribución se presenta el diseño e implementación de un chatbot para la aplicación del cuestionario Adult Self Report Scale-Versión 1.1 (EATDAH-A) así como los resultados de la aplicación del mismo y la opinión de los usuarios en cuanto a su utilidad y experiencia como usuario.It is estimated that the prevalence of Attention Deficit Hyperactivity Disorder (ADHD) in university students is from 2 to 4.53% but varies from one university to another. However, many students avoid therapies due to grief, nervousness, fear, or because they feel that the problems of others are greater than their own or they are unaware of the symptoms of ADHD. This contribution presents the design and implementation of a chatbot for the application of the Adult Self Report Scale-Version 1.1 (ASRS v1.1) questionnaire as well as the results of its application and the opinion of users regarding its usefulness and user experience.Facultad de Informátic

Chatbots in social networks for the timely support of university students with attention-deficit/hyperactivity disorder symptoms

Se estima que la prevalencia del trastorno por déficit de atención con hiperactividad (TDAH) en estudiantes universitarios es del 2 al 4.5% pero varía de una universidad a otra. Sin embargo, muchos estudiantes evitan acudir a tratamiento por ansiedad, temor al estigma, porque sienten que los problemas de los otros son mayores que los propios o bien desconocen la sintomatología del TDAH. En esta contribución se presenta el diseño e implementación de un chatbot para la aplicación del cuestionario Adult Self Report Scale-Versión 1.1 (EATDAH-A) así como los resultados de la aplicación del mismo y la opinión de los usuarios en cuanto a su utilidad y experiencia como usuario.It is estimated that the prevalence of Attention Deficit Hyperactivity Disorder (ADHD) in university students is from 2 to 4.53% but varies from one university to another. However, many students avoid therapies due to grief, nervousness, fear, or because they feel that the problems of others are greater than their own or they are unaware of the symptoms of ADHD. This contribution presents the design and implementation of a chatbot for the application of the Adult Self Report Scale-Version 1.1 (ASRS v1.1) questionnaire as well as the results of its application and the opinion of users regarding its usefulness and user experience.Facultad de Informátic

Galaxy classification: deep learning on the OTELO and COSMOS databases

Context. The accurate classification of hundreds of thousands of galaxies observed in modern deep surveys is imperative if we want to understand the universe and its evolution. Aims. Here, we report the use of machine learning techniques to classify early- and late-type galaxies in the OTELO and COSMOS databases using optical and infrared photometry and available shape parameters: either the Sersic index or the concentration index. Methods. We used three classification methods for the OTELO database: 1) u-r color separation , 2) linear discriminant analysis using u-r and a shape parameter classification, and 3) a deep neural network using the r magnitude, several colors, and a shape parameter. We analyzed the performance of each method by sample bootstrapping and tested the performance of our neural network architecture using COSMOS data. Results. The accuracy achieved by the deep neural network is greater than that of the other classification methods, and it can also operate with missing data. Our neural network architecture is able to classify both OTELO and COSMOS datasets regardless of small differences in the photometric bands used in each catalog. Conclusions. In this study we show that the use of deep neural networks is a robust method to mine the cataloged dataComment: 20 pages, 10 tables, 14 figures, Astronomy and Astrophysics (in press

Magnetic pinning of flux lattice in superconducting- nanomagnet hybrids

Strong superconducting pinning effects are observed from magnetic landscapes produced by arrays of circular rings with varying magnetic remanent states. The collective and the background pinning of superconducting Nb films is strongly enhanced by the stray magnetic field produced by an array of circular Ni rings magnetized to form “onion” (bidomain) states. On the other hand, when the same rings are magnetized into vortex (flux-closed) states, or are randomly magnetized, the superconducting pinning is much smaller. The greatest pinning is produced when the superconducting vortex lattice motion is along a direction in which there is a strong magnetic field variation