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- ItemKiwifruit susceptibility to Botrytis cinerea and Botrytis prunorum during fruit development in Chile(Amer Phytopathol Soc, 2017) Riquelme Toledo, Danae; Valdés Gómez, Héctor; Zoffoli, Juan Pablo
- ItemRegolith-hosted rare earth genesis under humid climates in the Coastal Cordillera of the Central Andes(2023) Bustos, Nicolas; Marquardt R., Carlos; Roquer, Tomas; Vergara, PaulinaRegolith-hosted rare earth element deposits (RH-REE) have been recently found in Chile, nonetheless their ore formation controls, which include temperate to arid climate, intrusive rocks with weatherable REE minerals, and gentle slopes or pediplains, among others, differ from the most common deposits in Asia. This work addresses mineralization and exploration methods for RH-REE deposits across the Chilean Coastal Range. The studied prospect is associated with late Carboniferous I-type tonalitic intrusions. Mineralogical analysis (TIMA-X) indicates that allanite and monazite are the main REE-bearing minerals in the host rock. The regolith in the study area is up to 60 m deep and contains an exchangeable-REE concentration up to 2000 ppm, as determined by portable X-ray fluorescence (pXRF) and ICP-MS. We were able to recognize that REE-adsorption takes place both in preserved and partially eroded regoliths. Progressive weathering of these regoliths causes the pedolith/saprolith limit to be dynamic and accumulate REE due to the breakdown of allanite and monazite. Our data shows that the search for pediplains on suitable lithologies, mapping of regolith profiles, and their analysis via pXRF by quantifying yttrium, appears to be a suitable strategy for early exploration of RH-REE deposits in the Chilean Coastal Range.
- ItemRealistic in silico abdominal QSM phantom(2022) Silva, Javier I.Compared to Quantitative Susceptibility Mapping (QSM) in the brain, abdominal QSM faces additional issues due to the presence of gas and fatty tissue. Recent works in abdominal QSM are more focused on its feasibility as a biomarker for disease diagnosis than improving or assessing the robustness and quality of the reconstructions. In this work, we present an abdominal QSM phantom with realistic tissue textures. Our flexible simulation pipeline allows emulating different stages of diseases and MRI signal contributions. Our reconstruction experiments show the potential of our phantom to compare QSM algorithms in different scenarios.
- ItemA Quantitative Assessment of Carbon Dioxide Emissions Associated with Temporary Heating in Residential Housing(Springer Science and Business Media Deutschland GmbH, 2024) Castillo, V.,V.; Días Ferreira Barkokebas, Regina Celi; Barkokebas, Beda; Al-Hussein M.Temporary heating is a resource commonly used by construction practitioners in cold-climate regions to keep a constant temperature of the construction area in order to support construction work under cold weather conditions. Since the use of temporary heating depends on the project duration and outdoor temperature, it is challenging to accurately estimate its cost and carbon dioxide (CO2) emissions. Additionally, the typical practice in North American construction is to use concrete to build the basement of single-detached houses. This drives up the CO2 emissions associated with construction, as concrete has high levels of embodied CO2 emissions. In this regard, this research aims to quantify the environmental impact and cost of temporary heating and concrete usage for basements in single-family detached houses in cold-climate regions. A discrete-event simulation model is developed to obtain the project duration and the daily average propane consumption for basement projects. This information is then used to quantify the cost and CO2 emissions associated with temporary heating and concrete usage. The results demonstrate that the cost of temporary heating increases the total cost of a concrete basement project between 8.84% and 19.31%, and represents between 15.66% and 29.48% of the total CO2 emissions produced by temporary heating and concrete usage. In contrast, concrete represents 25.24% to 30.80% of the total cost of a concrete basement project and produces between 70.52% and 84.34% more CO2 emissions than temporary heating. A case study including data collected from seven actual concrete basement projects for single-family detached houses is used to build the simulation model used for this study.
- ItemInelastic dynamic analysis of a prestressed reinforced concrete frame(Taylor & Francis Group, 2016) Vásquez González, Jorge Andrés; Llera Martín, Juan Carlos de la; Rendel, MichaelCustomary Seismic design assumes a reduced design spectrum with a certain ductility level of the structure. Although proven successful, the design method provides little information about the inelastic behavior of a structure, which is expected to be large in severe earthquakes. This study deals with the inelastic dynamic response analysis of a large prestressed building to be constructed in Chile. Because of regularity of the structure, a 2D reinforced concrete frame was modeled using fiber elements regularized with a modified stress-strain constitutive relationship using the software Opensees. Therefore, damage may occur anywhere along the element characterized by variable reinforcing steel and internal forces. Results of the inelastic analysis show that inelastic deformations localize in a few places around the nodes, but the building is able to withstand a maximum credible earthquake demand without collapse.