El proceso de objetivación del concepto de área en estudiantes sordos desde el uso de artefactos

En el presente trabajo de investigación se muestran los avances del proyecto de investigación que se adelanta en el marco de la Maestría en Educación, línea Educación Matemática, bajo la orientación del grupo de investigación Matemática, Educación y Sociedad (MES) de la Universidad de Antioquia. En este estudio se pretende analizar el proceso de objetivación del concepto de área en estudiantes sordos desde el uso de artefactos. Esta investigación es realizada a la luz del paradigma cualitativo, bajo un enfoque crítico-dialéctico desde una investigación participante, y para el análisis de las producciones de los estudiantes se utiliza el estudio de casos

Search for eccentric black hole coalescences during the third observing run of LIGO and Virgo

Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total mass M>70 M⊙) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities 0<e≤0.3 at 0.33 Gpc−3 yr−1 at 90\% confidence level

Ultralight vector dark matter search using data from the KAGRA O3GK run

Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation time scale of DM

Conjuntos infinitos de enteros positivos cuyas sumas están libres de potencias

Tesis (Matemático).--Universidad de Cartagena. Facultad de Ciencias Exactas y Naturales. Programa de Matemáticas, 2004El presente estudio tiene por objeto construir un conjunto finito de enteros positivos tales que para cualquier ≥ 1 y cualesquiera n - elementos distintos x,1,,,,,,x1 la suma, no es la potencia perfecta

Evaluación prospectiva de la viabilidad de la instalación de calentadores de agua solar en los hogares como una forma alternativa de uso de GLP en Imbabura, Ecuador

Ecuador is a country with energy needs, which should be efficiently met by means of technical and financial considerations. Existing policy promotes the change of the national energy mix to renewables. In this context, this policy will discourage the consumption of liquefied petroleum gas (LPG) by eliminating gradually its sub - sidy. Therefore, this research carries out a prospective analysis up to 2050 in order to determine the feasibility of installing solar water heaters as alternative to the conventional systems based on LPG and firewood. In the same sense, this paper includes: the determination of the solar energy potential of Peguche (a community lo -cated in Imbabura, Ecuador), trends of the solar system’s costs, and trends of oil prices and oil sub-products for three prospective scenarios. In order to evaluate the feasibility of the project, the payback period based on the savings in the fuel consumption is calculated. To conclude, the paper highlights the environmental advantages in the use of this renewable energy in terms of greenhouse gas emissions (GHG

A Ubiquitous NFC Solution for the Development of Tailored Marketing Strategies Based on Discount Vouchers and Loyalty Cards

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Ocho Estudios de Salud Mental

La ley 1616 de 2013 de Colombia define a la salud mental como “un estado dinámico que se expresa en la vida cotidiana a través del comportamiento y la interacción”, y que permite utilizar los recursos emocionales, cognitivos y mentales de los individuos y de los grupos humanos, para vivir su cotidianidad de la manera más adaptativa posible. Por su parte, la Organización Mundial de la Salud (OMS, 2001) define la salud mental como ese estado de bienestar que permite al individuo ser consciente de sus capacidades y afrontar las tensiones normales, trabajar productivamente y ser capaz de contribuir a su comunidad. La salud mental es mucho más que la ausencia de trastornos mentales, es la capacidad de adaptarse al contexto, de manera que el individuo se sienta bien consigo mismo, a pesar de las circunstancias ambientales, sociales y/o socioeconómicas