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Mostrando ítems 11-20 de 77
Control de calidad en espectrometría gamma de bajo nivel
(2011-02-07)
Low level gamma spectrometry is a very precise techniqueto measure the concentration of nuclides present in different samples in Bq kg-1. The quality control of the procedure and method used be carried out by intercomparison ...
Producción de jarabe de fructosa con enzimas inmobilizadas en un proceso continuo a partir de tiquisque (<i>Xanthosoma sagittifolium</i>)
Producción de jarabe de fructosa con enzimas inmovilizadas en un proceso continuo a partir de tiquisque (<i>Xanthosoma sagittifolium</i>)
(2013-06-28)
High fructose corn syrups (HFCS) are mainly used by the food industry and are produced by enzymatic hydrolysis from cornstarch. The main objective of this project was to produce fructose syrups using tiquisque starch ...
Ciencia, tecnología y educación en Costa Rica en el período 2010-2014
Science, technology and education in Costa Rica between 2010 and 2014
(2017-09)
En este artículo se analizaron las distintas redes vinculadas a la formulación de políticas públicas en la
Comisión de Ciencia y Tecnología del Congreso de Costa Rica, entre el 2010 y 2014, con el propósito de
describir ...
Direct functionalization of Mn12-(methacrylate) clusters on Si(100): surface characterization and electrochemical properties
(2016-09)
The reaction of H–terminated Si(100) with methacrylate–substituted manganese carboxylate clusters [Mn12O12{CH2C(CH3)COO}16(H2O)4], [Mn12–(methacrylate)] via hydrosilylation afforded Mn12–(methacrylate)−Si(100). The chemically ...
Aplicación de la tomografía axial computarizada para la detección de bolsas de humedad en madera seca de gmelina arborea (roxb.)
(2009-01-13)
Due to its excellent growth rate and productivity, Gmelina arborea (Roxb.) is widely used for commercial reforestation in Costa Rica. However during the lumber drying process, the wooden boards show non-uniform values of ...
Una fundamentación instrumental de la Aritmética
(1990)
Desde el punto de vista de la génesis histórica y psicológica del conocimiento humano, poca duda cabe que los números naturales van siendo elaborados como referente social en el proceso de conteo. En este artículo se ...
EEfecto de contaminantes sobre la transferencia de oxígeno en sistemas de aeración analizado mediante un modelo de dos zonas simplificado
(2009-01-13)
A series of unsteady-state reaeration tests were performed in a 1000 l tank at 1-10-3 normal m3/s diffused-air flow rate and 298,65 K water temperature. Three different types of impurities: soybean oil, surfactant, and ...
Levantamiento topográfico de una aldea precolombina (900-1550 a.C.)
(2018)
The authors discuss methodological aspects of the topographic and archaeological analyses being carried out in Barranca, a pre-Columbian settlement in San Ramón, Alajuela. A discussion is also presented on the relevance ...
La cinética de la esterificación de ácidos carboxílocos es de segundo orden con repecto al alcohol
(2009-01-13)
Esterification of carboxylic acids with alcohols is considered as AAC2 type reaction. The specific rate of esterification of acetic acid with methanol, in mixtures of acetonitrile-methanol showed a quadratic dependence on ...
Monitoreo ambiental con detectores termoluminiscentes en Costa Rica
(2009-01-13)
Using thermoluminiscent dosimeters (Harshaw TLD-200) the first set of Costa Rica data on absorbed doses in air from natural radiation is obtained. During the period September 1996 through October 2000 eight different sites ...