3D Well-composed Polyhedral Complexes

A binary three-dimensional (3D) image $I$ is well-composed if the boundary surface of its continuous analog is a 2D manifold. Since 3D images are not often well-composed, there are several voxel-based methods ("repairing" algorithms) for turning them into well-composed ones but these methods either do not guarantee the topological equivalence between the original image and its corresponding well-composed one or involve sub-sampling the whole image. In this paper, we present a method to locally "repair" the cubical complex $Q(I)$ (embedded in $\mathbb{R}^3$) associated to $I$ to obtain a polyhedral complex $P(I)$ homotopy equivalent to $Q(I)$ such that the boundary of every connected component of $P(I)$ is a 2D manifold. The reparation is performed via a new codification system for $P(I)$ under the form of a 3D grayscale image that allows an efficient access to cells and their faces

Aplicación de técnicas de Machine Learning para la predicción de resultados deportivos

En este trabajo final de grado (TFG) se pretende investigar las distintas técnicas de aprendizaje automático de la rama de la inteligencia artificial conocida como Machine Learning con el fin de crear un prototipo de aplicación que ponga en práctica las soluciones identificadas para poder determinar si es posible predecir resultados deportivos y con qué índice de acierto.This final project (TFG) will investigate the different techniques of the field of artificial intelligence known as Machine Learning with the whole purpose of creating an application which puts into practice the identified solutions and determines if it is possible to predict sport results and the accuracy of the hit rate.Grado en Ingeniería Informátic

Programa social y calidad de vida en los usuarios de la Provincia Chupaca 2020 – 2021

La presente investigación planteo el objetivo de determinar de qué manera influye el Programa Pensión 65 en la calidad de vida de los usuarios de la provincia de Chupaca 2020 – 2021. Para ello se aplicó el diseño de la investigación fue no experimental por que no se manipulara variables. Siendo un estudio descriptivo, con corte transversal se realizó en un tiempo determinado (2020-2021). Como hipótesis formulamos: El Programa Pensión 65 influye en la calidad de vida de los de los usuarios en la provincia de Chupaca. La población que estudiamos estuvo compuesta por 1638 usuarios de la Provincia de Chupaca – Junín 2020 – 2021, y una muestra de 287 usuarios por criterio de exclusión e inclusión. Utilizamos la encuesta como técnica luego dos instrumentos, dos cuestionarios: primero dicotómica para Programa P65, segundo con escala de varias contestaciones politómica para calidad de vida. En nuestros resultados llegamos a la conclusión, que la variable Pensión 65 influye en el bienestar de vida a través de la seguridad económica en los usuarios pertenecientes a la provincia de Chupaca – Junín 2020 - 2021 se presenta que el grado de significatividad, p <0.05 y coeficiente Rho de Spearman = 0,660 con una varianza del Programa P65 y bienestar de vida con una influencia en 0,01%

Sistematización de experiencias exitosas de desarrollo Rural en el Departamento de Jinotega, 2013

Se realizó la investigación titulada “Sistematización de Experiencias Exitosas en Desarrollo Rural en el Departamento de Jinotega, 2013” con el fin de analizar las principales experiencias exitosas que han contribuido al desarrollo rural en este departamento. Específicamente, identificar las principales características que definen a las organizaciones exitosas previamente seleccionadas, así como determinar las principales innovaciones sociales y productivas generadas por las organizaciones, posteriormente analizar el impacto generado en el desarrollo humano en las comunidades de influencia y finalmente proponer una ruta del conocimiento del departamento de Jinotega con el propósito de intercambiar experiencia entre las diferentes comunidades. La población y muestra del estudio fueron todas las organizaciones gubernamentales y no gubernamentales las que a continuación se mencionan: Asociación de Educación y Comunicación (La Cuculmeca), AVODEC, INTERVIDA, UNAG, Cooperativa de Mujeres de Cerámica Negra. Mientras Las organizaciones Gubernamentales seleccionadas fueron: UNAN León CUR Jinotega, MEFCCA y MAG. Los resultados encontrados a través de la aplicación de instrumentos tales como entrevista dirigida a representantes de organizaciones y a líderes de las experiencias fueron: las principales características que definen a las organizaciones exitosas del departamento son: político-institucional, características sociales, ambientales y económicas; las principales innovaciones generadas por las organizaciones e instituciones y en las experiencias fueron del tipo productivo, tecnológico, comercial e institucional. En las comunidades de influencia, el impacto al desarrollo humano fueron principalmente: cambios en la calidad de vida en cuanto a incremento de ingresos, seguridad nutricional y alimentaria, educación, participación, productividad y comercializació

Characterization of wake properties in freely bubbling fluidized beds using Particle Image Velocimetry

The performance of fluidized beds in many physical or chemical operations is predominantly determined by the hydrodynamics and mass transfer characteristics. However, a proper description of a fluidized bed using phenomenological models requires correlations based on many different assumptions for the bubble and emulsion phases, where most of these assumptions have not been validated thoroughly at different operating conditions. One of the most typical assumptions is the fact that the wake of a bubble rises with exactly the same velocity as the bubble and occupies a specific and constant fraction in the bed, commonly around 15% of the bubble volume (1). The wake fraction has been studied using optical techniques and the geometry of the single bubbles injected has been analysed at different experimental conditions (2). However, these results are mainly based on geometric observations, and are not based on specific properties of fluidized beds. In this study, two new methods for the characterization of wake properties in fluidized beds are developed and studied based on the dynamics of the solids phase. Particle Image Velocimetry (PIV) allows to determine the solids phase velocity profiles in detail, which is used for the investigation of the wake properties. PIV combined with Digital Image Analysis (DIA) can provide the average solids mass fluxes throughout the fluidized bed, along with the bubble properties. When relating all positive solids fluxes to the solids carried along by the bubbles in their wakes, the average wake fraction can be obtained directly, as presented in the Figure 1. This method provides information on average results and therefore accounts for all bubbles observed during the experimental evaluation. Please click Additional Files below to see the full abstract

Measurement of solids circulation rates with optical techniques in circulating beds and comparison to pressure drop methods

The number of applications employing circulating fluidized beds has increased considerably over the last years following the important development of chemical looping technologies for power generation (combustion) or fuel conversion (reforming) with inherent CO2 capture. The performance of these reactors is strongly determined by the amount of solids transferred from one reactor to the other, commonly referred to as the Solids Circulation Rate (SCR). The solids inventory, particle characteristics and gas velocities strongly influence the SCR. The determination of the SCR has been carried out using invasive and non-invasive measurement techniques. The direct measurement through solids collection in the loop seal is the most applied technique, but this technique requires opening of the loop seals and thus may be expensive, whereas other methods suffer from large inaccuracies. There is yet no optimal technique available that combines good accuracy with reasonable costs, as recently also discussed by Alghamdi et al. (1). In this work, a pseudo 2D internally circulating fluidized bed (Figure 1) has been built to explore the potential of optical techniques like Particle Image Velocimetry (PIV) combined with Digital Image Analysis (DIA) for non-invasive, whole-field measurements. Moreover, the setup allows for the measurement of the pressure drop (fluctuations) along the riser and the collection of particles circulating from one reactor to the other, so that the three different measurement techniques can be compared. Please click Additional Files below to see the full abstract

Estimation of Energy Consumption in Street Lighting using Mobile Devices

The growing energy consumption is not sustainable in the long run. Taking into account that street lighting is one of the highest energy consumers in cities, this paper aims to develop a methodology to estimate the energy consumption of these installations with as few input variables as possible. In addition, the paper presents a mobile application developed to help lighting managers not only on the energy consumption evaluation, but suggesting the possible improvements on current systems which can save energy in case that they are implemented