Application of a Bayesian Method to Absorption Spectral-Line Finding in Simulated ASKAP Data

The large spectral bandwidth and wide field of view of the Australian SKA Pathfinder radio telescope will open up a completely new parameter space for large extragalactic HI surveys. Here we focus on identifying and parametrising HI absorption lines which occur in the line of sight towards strong radio continuum sources. We have developed a method for simultaneously finding and fitting HI absorption lines in radio data by using multi-nested sampling, a Bayesian Monte Carlo algorithm. The method is tested on a simulated ASKAP data cube, and is shown to be reliable at detecting absorption lines in low signal-to-noise data without the need to smooth or alter the data. Estimation of the local Bayesian evidence statistic provides a quantitative criterion for assigning significance to a detection and selecting between competing analytical line-profile models.Comment: 8 pages, 5 figures and 1 table; accepted for publication in PAS

La génesis del mal en el sistema educativo colombiano

Editoria

Las instituciones de educación superior en Colombia

Editoria

El valor de la etnografía en la investigación educativa

Editoria

La versatilidad del uso y aplicación de la tecnología

La versatilidad del uso y aplicación de la tecnologíaLa versatilidad del uso y aplicación de la tecnologí

El Sistema de formación y la investigación en Colombia

El Sistema de formación y la investigación en ColombiaEl Sistema de formación y la investigación en Colombi

Evolution in the Disks and Bulges of Group Galaxies since z=0.4

We present quantitative morphology measurements of a sample of optically selected group galaxies at 0.3 < z < 0.55 using the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and the GIM2D surface brightness--fitting software package. The group sample is derived from the Canadian Network for Observational Cosmology Field Redshift survey (CNOC2) and follow-up Magellan spectroscopy. We compare these measurements to a similarly selected group sample from the Millennium Galaxy Catalogue (MGC) at 0.05 < z < 0.12. We find that, at both epochs, the group and field fractional bulge luminosity (B/T) distributions differ significantly, with the dominant difference being a deficit of disk--dominated (B/T < 0.2) galaxies in the group samples. At fixed luminosity, z=0.4 groups have ~ 5.5 +/- 2 % fewer disk--dominated galaxies than the field, while by z=0.1 this difference has increased to ~ 19 +/- 6 %. Despite the morphological evolution we see no evidence that the group environment is actively perturbing or otherwise affecting the entire existing disk population. At both redshifts, the disks of group galaxies have similar scaling relations and show similar median asymmetries as the disks of field galaxies. We do find evidence that the fraction of highly asymmetric, bulge--dominated galaxies is 6 +/- 3 % higher in groups than in the field, suggesting there may be enhanced merging in group environments. We replicate our group samples at z=0.4 and z=0 using the semi-analytic galaxy catalogues of Bower et al (2006). This model accurately reproduces the B/T distributions of the group and field at z=0.1. However, the model does not reproduce our finding that the deficit of disks in groups has increased significantly since z=0.4.Comment: Accepted for publication in MNRAS. 20 pages, 17 figure

Induced Anisotropies in NiCo Obliquely Deposited Films and Their effect on Magnetic Domains

English Article: Oblique and in-plane anisotropies in obliquely evaporated NiCo thin films were investigated in order to understand their origin. All the compositions studied clearly show the effect of columnar grain morphology coupled with some intrinsic factors such as magnetostriction and crystallinity. Energy calculations are undertaken to explain the effect of

Características de los ambientes de aprendizaje enriquecidos con TIC para la comprensión lectora en el ciclo de la Educación Básica

Low outcomes of middle students in Language in national and international tests, its negative impact on mobility and permanence in higher education and on regional socioeconomic development, demand by schools the urgent implementation of strategies to strengthen reading comprehension with ICT support. The objective of the article is to inquire about the characteristics of the learning environments that integrate ICT to promote reading comprehension and the role that teachers should play in its implementation. Databases, books and digital documents were searched using the criteria words: reading comprehension, ICT integra-tion, and learning environments, and the terms: critical reading, digital technologies, learning environments, in English and in Spanish, between the years 2014 and 2021, from which 72 were analyzed for fulfilling the purpose of the review and 31 did partially. In the conclusion it is related the identification of ICT resources that integrate into the pedagogical processes to promote reading comprehension, the characteristics of the en-vironment that can be incorporated in the design of learning environments and the roles that the teacher must assume for the implementation in Middle School.Los bajos resultados de los estudiantes de educación básica en Lenguaje en las pruebas nacionales e internacionales, sus consecuencias negativas en la movilidad y permanencia en la educación superior y en el desarrollo socioeconómico regional, demandan que desde las escuelas se implementen estrategias para fortalecer la comprensión lectora con apoyo de las TIC. El objetivo del artículo es indagar sobre las características de los ambientes de aprendizaje que integran las TIC para favorecer la comprensión lectora y el papel que deben jugar los docentes en su implementación. Se consultaron bases de datos, libros y documentos digitales con los criterios: comprensión lectora, integración de la TIC, y ambientes de aprendizaje, y los términos: lectura crítica, tecnologías digitales, entornos de aprendizaje, en inglés y en español, entre 2014 y 2021, de los cuales se analizaron 72 que cumplieron con el propósito de la revisión y 31 parcialmente. Se concluye con la identificación de los recursos TIC que se integran a los procesos pedagógicos para favorecer la comprensión lectora, las características del entorno que se pueden incorporar en el diseño de los ambientes de aprendizaje y los roles que debe asumir el docente para su implementación en el ciclo de la educación media