Revista de Ciencia y Tecnología
Browse by
Recent Submissions
-
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 ... -
Estudio de una definición no aritmética de finitud conjuntista
(1987)Intuitivamente, un conjunto es finito si termina quedando vacío al extraerle elementos de uno en uno. El propósito de este trabajo es formalizar esta noción de finitud conjuntista y discutir algunas propiedades que se ... -
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 ... -
Síntesis y evaluación de complejos de cobre (I/II) con ligandos polipiridínicos como mediadores redox en celdas solares sensibilizadas con tintes
(2020)En las celdas solares sensibilizadas con tintes (DSSCs), el mediador redox en el electrolito permite la transferencia de cargas al regenerar las moléculas del tinte durante su operación. Se sintetizaron y caracterizaron ... -
Algunas características de las mareas en la costa Pacífica y Caribe de Centroamérica
(2006)Tidal levels were studied in 48 stations using tidal predictions along the coasts of the Pacific and Caribbean of Central America. Statistics of basic mean values were analyzed to characterize the stations. These ... -
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 ... -
Harnessing titanium dioxide surface toward novel functional materials
(2015)The ever-increasing worldwide energy consumption has led the society to quest for novel and functional materials that can be used in the development of solar fuels to some extent lessen the dependence on fossil fuels. In ... -
Ciencia, tecnología y educación en Costa Rica en el período 2010-2014
(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 ... -
Modelización directa y comparación de los principales dispositivos geoeléctricos
(2009-04-29)With the purpose of comparing the main geolectrics arrays used for the realization of vertical electrical sounding, a direct simulation is presented, considering two geologic models. The investigation depth, precision in ... -
Diseño, construcción y puesta en marcha de un fotobiorreactor tubular para producir la microalga Chlorella sp.
(2015-06-17)The following is an article about the design and construction of a tubular photobioreactor to produce microalgae Chlorella sp. using combustion gases from a fuel-oil boiler. The reactor was build for the treatment of 50 L ... -
Long-term voltage stability assessment using Quasi-Steady State Simulation in Matlab
(2015-06-17)A Quasi Steady State Simulator (QSSS) for long term voltage stability assessment has been developed, tested and verified in Matlab. Theory and modelling assumptions behind QSSS are explained, including many elements present ... -
Emisiones antropogénicas de compuestos tóxicos para el aire en el Gran Área Metropolitana de Costa Rica en el 2007
(2015-06-17)The Emissions Inventory Toxic Air Compounds for the Greater Metropolitan Area in 2007 is framed within the air quality policy in Costa Rica. The main toxic anthropogenic contaminants were toluene, methanol, xylenes, ... -
Microrredes en la red eléctrica del futuro - caso Huatacondo
(2014-07-07)This paper proposes a new paradigm related to electrical power systems, known as Microgrids, with emphasis on those systems that must operate in isolated communities. It redefines the concept of supervisory control and ... -
Purificación y cuantificación de glicerina cruda y adaptación del método ASTM D6584 para la determinación de glicerina en biodiesel
(2014-07-07)In this paper an analytical method is validated for the purification and quantification of the content of glycerol in samples of crude oil from the production of biodiesel fuel. We compared the purity of the glycerol present ... -
Calculations of chemical equilibrium with symbolic computation
(2014-07-07)We show how a processor for symbolic computation can readily enable extensive calculations to describe the equilibria involving gases, the pH of an aqueous solution in the titration of a polyprotic acid, and complex ions ... -
Tecnología y estudios del futuro: a propósito de un libro de Barker y Erickson
(2014-07-07)Futures Studies are important around the world to predict technological and social changes, as demonstrated with a simple Internet search. Paradoxically, these studies are neither promoted nor relevant in Costa Rica, in ... -
Uso de la resonancia magnética nuclear para la determinación de curcuminoides en cúrcuma y curry producidos y vendidos en Costa Rica
(2014-07-07)Turmeric (Curcuma longa) rizhome is used as a spice to give colour to food, but its extracts have also shown many interesting biological activities that make C. longa valuable for cultivation and consumption. The active ... -
Acumulación de cobre en plantas silvestres de zonas agrícolas contaminadas con el metal
(2013-06-28)Copper is an essential nutrient that is known to result in toxic damages to organisms. Copper salts have been utilized as fungicide because of its protective effect against several diseases in plants, but the repeated use ... -
Producción de jarabe de fructosa con enzimas inmobilizadas 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 ... -
La naturaleza del enlace químico 2013 ¡No existe tal cosa llamada orbital!
(2013-06-28)Despite the fact that the chemical bond is a fiction, although convenient and nearly harmless, it plays an enormous role in the thinking, and especially the education, of chemists at all levels. Much further fiction has ...
RSS 1.0