Browsing Artículos científicos by Subject "QUÍMICA"
Now showing items 1-6 of 6
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Analysis of energy transfer and ternary non-covalent filler/matrix/UV stabilizer interactions in carbon nanofiber and oxidized carbon nanofiber filled poly(methyl methacrylate) composites
(Elsevier, 2011-10-27)Ternary non-covalent interactions between carbon nanofibers (CNFs), oxidized carbon nanofibers (ox- CNFs), poly(methyl methacrylate) (PMMA) chains, and benzotriazole-containing UV stabilizers were analyzed using ... -
Análisis de las Olimpiadas Nacionales de Química en Costa Rica: Alcances y retos para la población joven
(Universidad Nacional (Costa Rica), 2012)La Escuela de Química ha promovido programas y proyectos académicos como las Olimpiadas de Química que estimulen y mejoren el aprendiza-je de esta ciencia. Como competencia se identifican estudiantes de alto desempeño ... -
Bioguided Phytochemical Study of Ipomoea cairica Extracts with Larvicidal Activity against Aedes aegypti
(MDPI, 2022-02-16)Vector-borne diseases, such as those transmitted by Aedes aegypti, are a constant threat to inhabitants of tropical regions of the planet. Synthetic chemicals are commonly used as a strategy to control them; however, ... -
Impacto nacional e internacional en la promoción de las vocaciones científicas del Programa Mejoramiento de la Enseñanza de la Química(PMEQ)
(Universidad Nacional (Costa Rica), 2013)La labor extensionista de la Escuela de Química de la UNA en Costa Rica se ha visto reflejada desde sus inicios, en gran medida, por las actividades realizadas desde el Programa de Mejoramiento de la Enseñanza de la ... -
Kinetics of Isothermal Degradation Studies in Adhesives by Thermogra vimetric Data: Effect of Hydrophilic Nanosilica Fillers on the Thermal Properties of Thermoplastic Polyurethane-Silica Nanocomposites
(Recent Patents on Nanotechnology, 2008)The kinetics of thermal degradation process on thermoplastic polyurethanes (TPUs) adhesives with hydrophilic nanosilicas was studied using isothermal thermogravimetric analysis within the temperature range from 360 °C ... -
Phytonutraceutical evaluation of five varieties of tomato (Solanum lycopersicum) during ripening and processing
(Elsevier, 2022-07-15)Tomato (Solanum lycopersicum) is the largest produced vegetable in the world after potato and sweet potato. It is an important source of carotenoids (mainly lycopene), ascorbic acid, and phenolic compounds. In this work, ...