Browsing Artículos científicos by Title
Now showing items 58-77 of 114
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Factores que influyen en la forma de la cola de un tsunami
(UNICIENCIA Vol. 23 65-69, 2009)The propagation speed of a tsunami depends on the depth of the ocean in which it propagates. As the tsunami crosses the abyssal plain, it suffers modifications in its form due to change in the depths of the ocean bottom. ... -
Feasibility of dose enhancement assessment: preliminary results by means of Gd-infused polymer gel dosimeter and Monte Carlo study
(Universidad Nacional (Costa Rica), 2018)This work reports the experimental development of an integral Gd-infused dosimeter suitable for Gd dose enhancement assessment along with Monte Carlo simulations applied to determine the dose enhancement by radioactive ... -
First record of Scapholeberis freyi Dumont and Pen- saert, 1983 (Crustacea:Anomopoda: Daphniidae) from Colombia
(Universidad Nacional Mayor de San Marcos, Perú., 2021)From the analysis of plankton samples from a temporary pond of northern Colombia some female specimen of the daphinid cladoceran Scapholeberis freyi Dumont and Pensaert, 1983 was collected. It represents the first report ... -
Graphene flakes obtained by local electro-exfoliation of graphite with a STM tip
(Physical Chemistry Chemical Physics vol.11 no.19 8061-8068 2017, 2017-02-24)Graphite surfaces can be manipulated by several methods to create graphene structures of different shapes and sizes. Scanning tunneling microscopy (STM) can be used to create these structures either through mechanical ... -
Hidrography and river plumes in Golfo Dulce, South Pacific of Costa Rica
(Universidad de Costa Rica, 2015-07)Oceanographic variables at 33 stations distributed in Golfo Dulce, Costa Rica, during the dry and rainy seasons between 2009 and 2010, were analyzed with CTD profiles, where salinity, temperature, sigma-T and currents were ... -
High Specific Capacity of Lithium–Sulfur Batteries with Carbon Black/Chitosan- and Carbon Black/Polyvinylidene Fluoride-Coated Separators
(MDPI, 2022-03-17)In this research, the shuttle effect and the low sulfur activation of lithium–sulfur batteries were mitigated by coating the cathode side of Celgard 2400 separators with mixtures of carbon black/chitosan or carbon ... -
Historical Tsunamis at the Costa Rican Caribbean Coast
(Universidad de Costa Rica, 2021-04-22)Aún cuando los tsunamis son poco frecuentes en el Caribe de Costa Rica, pueden llegar a ser destructivos. En Costa Rica existe la creencia errónea de que no hemos tenido tsunamis. Sin embargo, los autores encontraron ... -
Impact in Costa Rica of the tsunami caused by the Hunga Tonga - Hunga Ha’apai volcano eruption on 15 January 2022
(Springer, 2023-05-12)Hunga Tonga–Hunga Ha’apai had a large eruption (VEI 5–6) on 15 January 2022, which caused a tsunami recorded in all ocean basins. Costa Rica has made many advances in tsunami preparation over the past 9 years since the ... -
Importancia de la batimetría de las planicies abisales en la propagación de tsunamis transoceánicos
(Ciencia y tecnología Vol.25,No.1-2 22-33, 2007)The initial form of a tsunami originated by an homogeneous seismic source consists on a simple wave front. While the tsunami propagates in deep water, this simple form suffers several modifications ... -
Influence of substrate temperature on phase formation in Al-Cr thin films
(Universidad Nacional, Costa Rica, 2000)Thin films (of the order of nm) of Al-Cr alloys were prepared by successive depositions by an electron gun in a vacuum chamber. Three Al and two Cr layers, of thicknesses as to yield the final composition, were de posited ... -
Influence of the Madden–Julian oscillation on Costa Rican mid-summer drought timing
(John Wiley and Sons Ltd, 2019)The Central American mid-summer drought (MSD) is the decline of precipitation during the middle of the wet season (July and August) over Central America and southern Mexico. It affects agriculture and favours the initiation ... -
Infragravity wave energy partitioning in the surf zone in response to wind-sea and swell forcing
(MDPI AG, 2019)An alongshore array of pressure sensors and a cross-shore array of current velocity and pressure sensors were deployed on a barred beach in southwestern Australia to estimate the relative response of edge waves and leaky ... -
Líneas ciclotrónicas en el espectro de rayos y pulsado
(Universidad Nacional [Costa Rica], 1989-01-01)Si el proceso de Bremsstrahlung magnético es el responsable de las líneas observadas en los espectros de dos estallidos de rayos y, GB880205 y GB870303 detectados por el espectrómetro del satélite GINGA, entonces los ... -
M2 Currents And Residual Flow In The Gulf Of California
(Elsevier, 1992)The full nonlinear, vertically-averaged equations of motion are time integrated through a finite difference scheme on a regular grid that reproduces the topography of the Gulf of Califor nia with a mesh size of 14 ... -
Mapas de Radiación ultravioleta en Costa Rica
(Universidad Nacional (Costa Rica), 2009)La radiación ultravioleta (UV) contribuye relativamente con poca energía al espectro solar. Sin embargo, es importante, porque biológicamente es muy activa. El objetivo de este trabajo es valorar los niveles máximos de ... -
Las masas de agua del océano Pacifico Tropical frente a Costa Rica (ING)
(Universidad Nacional (Costa Rica), 1984-07-01)Utilizando datos de la Expedición EASTROPAC, se estudiaron las principales masas de agua presentes en el Océano Pacifico Tropical frente a Costa Rica. Fueron encontradas el agua superficial tropical (AST), el agua superficial ... -
Medición y predicción de la radiación solar global ultravioleta (0.295-0.385 μm) en condiciones de cielos claros y sin nubes
(Universidad Nacional (Costa Rica), 2008)Los valores de la radiación solar global ultravioleta fueron medidos con un radiómetro ultravioleta y también predichos con un modelo espectral atmosférico. Los valores obtenidos con el modelo espectral atmosférico, que ... -
Medición y predicción de la radiación solar global UV-B bajo cielos claros y sin nubes
(Universidad Nacional (Costa Rica), 2010)Se presentan mediciones experimentales de la radiación solar ultravioleta en el rango B del espectro solar (UV-B) y la radiación ultravioleta en el rango total RUV (UV-A+UV-B) en días claros y sin nubes en Heredia, Costa ... -
Medidas topográficas en superficies atómicamente planas en condiciones ambiente mediante un microscopio de efecto túnel, un enfoque didáctico
(Universidad Nacional de Costa Rica, 2019-01-31)Uno de los grandes avances en la nanotecnología fue el desarrollo del microscopio de efecto túnel, herramienta que ha permitido poder manipular átomos, moléculas, estudiar el transporte electrónico en un solo átomo e incluso ... -
Metodología para la Evaluación de Rutas de Evacuación en caso de Tsunami Aplicado a la Costa del Pacífico Norte y Central de Costa Rica
(Revista en Torno a la Prevención no.16 17-26 2016, 2016)Se ha diseñado un método con el objetivo de elaborar una cartografía de rutas de evacuación en caso de tsunami a escala 1:10.000, basado en las directrices establecidas por la Comisión Europea. Las áreas de estudio son las ...