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- ItemCorrosion Analysis of a Ni-Al Bronze for Fuel Cell Applications(2025) Sancy, Mamié; Arcos, Camila; Guerra, Carolina; Ringuedé, Armelle; Noel, CorentinGlobal energy demand has increased significantly due to world population growth and the industrialization of developing economies. Its production has been based mainly on fossil-fuel energy, increasing the global warming effect upon the rise of greenhouse gases in the atmosphere, such as carbon dioxide (CO2). In this context, the International Energy Agency reported that the global temperature will increase by 2.7 °C by 2100, which can be decreased by using renewable energies, as written by the United Nations Framework Convention on Climate Change. Moreover, according to the last report of the Intergovernmental Panel on Climate Change, it is crucial to substantially reduce CO2 emissions and other greenhouse gases to improve air quality and stabilize global temperatures. However, nowadays, world energy generation from renewable resources, such as wind, solar, hydroelectric, biomass, tidal, and geothermal, only corresponds to 40%. Fuel cell technology is an excellent opportunity for reducing the dependence on fossil fuels and carbon footprint production. FC uses clean energy with a high conversion efficiency and system configuration that facilitates the easy capture of CO2. Different FC exists according to the operation temperature, the electrolyte chemical nature, and the fuel, increasing the conversion efficiency at higher temperatures, such as in Molten Carbonate Fuel Cells and Solid Oxide Fuel Cells, or even more recent Hybrid Fuel Cells, combining both previously mentioned technologies. Although FC has existed for decades, challenges exist to improve its efficiency. Therefore, developing new functional materials for innovative devices or applications is crucial in our changing world. New paradigms are necessary to produce cleaner energy or cheaper and more efficient materials for transport or other domains. This work focuses on the corrosion performance of a nickel-aluminum bronze alloy (NAB) obtained by laser powder bed fusion exposed to molten carbonate at high temperatures under a hydrogen/nitrogen atmosphere. Using electrochemical measurements and surface analyses, NAB samples were monitored before and after 120 hours of exposure between 550 and 650 °C. Scanning electron microscopy and X-ray photoelectron spectroscopy of NAB demonstrated that an oxide film was formed on the NAB surface, rich in Al2O3 and Cu2O. Open circuit potential and impedance analysis of NAB revealed that the oxide film was stable under the exposure condition. In addition, the impedance analyses showed a capacitive behavior associated with a porous behavior, relate to the oxide film, and a Warburg impedance
- ItemUsing the DFMA approach in the early integration of actors for the design of an industrialized timber building – case study(World Conference on Timber Engineering 2025, 2025) Méndez López, Daniela; Lorca Pavez, Fabiana Gloria; Carpio Martínez, ManuelDesign for Manufacture and Assembly (DfMA) is a methodology that optimizes the design process to facilitate manufacturing and assembly, promoting more efficient and cost-effective construction. This study describes the process of early integration of actors in a case study of an industrialized timber building in Chile, framed in the Housing Emergency Plan. Involving architects, engineers, manufacturers, and builders from the early stages, the DfMA methodology was applied to improve communication and coordination between all actors. Five design stages were identified based on the RIBA guide, and BIM and modeling tools were used to integrate information from all participants. The results indicate that, although design time increases, production is more efficient, with fewer errors and rework, and higher construction quality. This study provides a framework for future projects in the construction industry, highlighting the importance of early integration and use of digital tools. Future work should validate time and cost savings, reduction in waste, improvement in quality and processes in manufacturing and construction phases.
- ItemPhases of architectural design in the development of a modular and panelized wooden building with early integration process(2025) CaamañoLorca, José Luis; Lorca Pavez, Fabiana Gloria; Méndez López, DanielaThe article analyzes a wood architecture project as a sustainable solution for the construction of industrialized social housing buildings in Chile. It highlights the importance of early integration of architectural and engineering teams. The project, a 4-story light wood frame building, underscores the need for standardization and precision in manufacturing to avoid transportation and assembly issues. A design divided into four phases is proposed: conceptualization, schematic design, architectural design, and manufacturing adjustments. Each phase involves collaboration among various professionals to optimize design and construction. The case study analysis presents early integration and standardization as essential factors to improve quality, efficiency, and reduce costs in the construction of wooden buildings, proposing them as a viable and sustainable option in the Chilean urban context.
- ItemRising from Covid-19: Hybrid Teaching Experiences of University Teachers(2025) Prakasha, G. S.; Ordenes Guzmán, Maria Carolina; Lapina, MariaEstudio cualitativo que analiza las experiencias de docentes universitarios en la transición hacia la enseñanza híbrida durante la pandemia de COVID-19. Se entrevistaron ocho profesores y se aplicó análisis fenomenológico interpretativo (IPA). Los hallazgos identifican falta de conciencia y experiencia previa, incertidumbre laboral, dificultades de compromiso estudiantil, preocupaciones de seguridad y barreras tecnológicas. Se recomienda más investigación para comprender los matices de la enseñanza híbrida y soluciones a los desafíos detectados.
- ItemThe opportunities of timber frame construction, under building energy efficiency codes and environmentally friendly public policies, in developing countries(World Conference on Timber Engineering (WCTE), 2021) Victorero Castaño, Felipe Andrés; Pavez Gallegos, Danny Leonel; Méndez López, DanielaTimber construction is widespread in developed countries, for its multiple benefits, although developing countries such as Latin Americans tend to use other materials as an alternative. It can be explained by many factors, being one of the most important the lack of an industry that can give cost-competitive buildings, as well as national codes requirements to promote good construction standards and energy efficiency minimum requirements. Chile, one of the leading timber construction countries in Latin America, presents a chance to study how modern timber frame construction can develop under different geographical, climatic, and industry conditions. This work studies the timber frame building's opportunities, under five different cases, by evaluating construction costs and the impact of envelope's thermal insulation for energy efficiency. The result of this study shows that Chilean timber frame houses are more cost-competitive than other materials alternatives; and even though timber frame multistory buildings, are not as competitive when direct construction costs are compared with other materials, they could present fewer operation costs on their life span. Also, this study shows that minimum thermal insulation standards could contribute, at least at first, to making timber buildings more economically attractive against other materials, and especially in colder climates. Moreover, public policies focused on measuring and pricing constructions environmental impacts, such as CO2e emissions, could also promote the use of more sustainable and renewable materials like timber frame constructions in developing countries, and need to be evaluated to reach a more sustainable model in the future.