https://hdl.handle.net/20.500.12008/23 2026-08-22T01:41:29Z https://hdl.handle.net/20.500.12008/55361 Título: Propiedades físico-mecánicas de adoquines de hormigón producidos en Uruguay Autor: Vila, Patricia; Pereyra, María Noel Resumen: Los pavimentos de adoquines de hormigón son una alternativa eficiente debido a su resistencia, durabilidad, fácil mantenimiento y su versatilidad estética. En Uruguay, la norma de adoquines (UNIT 787) está desactualizada y a nivel internacional no existe consenso en los requisitos aplicables. El objetivo de este trabajo es analizar las propiedades físico-mecánicas de adoquines de la producción nacional, con el fin de generar una base de datos que refleje la producción y contribuya a la actualización de la normativa vigente. Para ello se evaluaron las principales propiedades de interés (absorción de agua, densidad, resistencia a compresión, módulo de rotura, tracción indirecta por compresión y desgaste) y se analizó tanto la variabilidad de los resultados obtenidos como su correlación con la resistencia a la compresión, que constituye el requisito actual de la norma. Los resultados mostraron una adecuada correlación entre la resistencia a compresión y el resto, a excepción de la resistencia al desgaste.; Concrete block pavements are an efficient alternative due to their strength, durability, easy maintenance, and aesthetic versatility. In Uruguay, the concrete block standard UNIT 787 is outdated, and there is no consensus on applicable requirements at the international level. The objective of this paper is to analyze the physical and mechanical properties of paving blocks produced in the country to generate a database that reflects local production and contributes to updating the current regulations. The main properties of interest were evaluated, including water absorption, density, compressive strength, modulus of rupture, splitting tensile strength, and abrasion resistance. The variability of the results and their correlation with compressive strength, which is the current requirement established by the standard, were also analyzed. The results showed a good correlation between compressive strength and other properties, except for abrasion resistance. 2025-01-01T00:00:00Z https://hdl.handle.net/20.500.12008/47504 Título: Quasi-linear fractional-order operators in Lipschitz domains. Autor: Borthagaray, Juan Pablo; Li, Wenbo; Nochetto, Ricardo H. Resumen: We prove Besov boundary regularity for solutions of the homogeneous Dirichlet problem for fractional-order quasi-linear operators with variable coefficients on Lipschitz domains Ω of Rd. Our estimates are consistent with the boundary behavior of solutions on smooth domains and apply to fractional p-Laplacians and operators with finite horizon. The proof exploits the underlying variational structure and uses a new and flexible local translation operator. We further apply these regularity estimates to derive novel error estimates for finite element approximations of fractional p-Laplacians and present several simulations that reveal the boundary behavior of solutions. 2024-01-01T00:00:00Z https://hdl.handle.net/20.500.12008/47503 Título: Monotone two-scale methods for a class of integrodifferential operators and applications. Autor: Borthagaray, Juan Pablo; Nochetto, Ricardo H.; Salgado, Abner J.; Torres, Céline Resumen: We develop a monotone, two-scale discretization for a class of integrodifferential operators of order 2s, s ∈ (0,1). We apply it to develop numerical schemes, and derive pointwise convergence rates, for linear and obstacle problems governed by such operators. As applications of the monotonicity, we provide error estimates for free boundaries and a convergent numerical scheme for a concave fully nonlinear, nonlocal, problem. 2024-01-01T00:00:00Z https://hdl.handle.net/20.500.12008/47079 Título: Smartphone light sensors as an innovative tool for solar irradiance measurements. Autor: Di Laccio, José Luis; Monetta, Andrés; Alonso-Suárez, Rodrigo; Monteiro, Martín; Marti, Arturo C. Resumen: In recent years, the teaching of experimental science and engineering has been revolutionized by the integration of smartphone sensors, which are widely used by a large portion of the population. Concurrently, interest in solar energy has surged. This raises the important question of how smartphone sensors can be harnessed to incorporate solar energy studies into undergraduate education. We provide comprehensive guidelines for using smartphone sensors in various conditions, along with detailed instructions on how to calibrate them with widely accessible clear-sky satellite data. This smartphone-based method is also compared with professional reference measurements to ensure consistency. This experiment can be easily conducted with most smartphones, basic materials, and a clear, open location over a few hours (methods). The findings demonstrate that smartphones, combined with simple resources, can accurately measure solar irradiance and support experiments on solar radiation physics, atmospheric interactions, and variations in solar energy across locations, cloud cover, and time scales. This approach provides a practical and accessible tool for studying solar energy, offering an innovative and engaging method for measuring solar resources. 2024-01-01T00:00:00Z