Browsing Departamento de Física by Title
Now showing items 15-34 of 159
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Biocomposites of Low-Density Polyethylene PlusWood Flour or Flax Straw: Biodegradation Kinetics across Three Environments
(MDPI journals, 2021-06-29)The purpose of this study was to assess the potential for biocomposite films to biodegrade in diverse climatic environments. Biocomposite films based on polyethylene and 30 wt.% of two lignocellulosic fillers (wood flour ... -
Características hidrográficas del sistema lagunar los micos-quemada en el Caribe hondureño
(Universidad Nacional (Costa Rica), 2009-12)Auspiciado por el Proyecto PREPAC (Plan Regional de Pesca y Acuicultura Continental) se realizó un levantamiento hidrográfico en 27 estaciones en el sistema lagunar Los Micos-Quemada en el litoral Caribe de Honduras. Los ... -
Características termohalinas de las aguas costeras del Caribe sur de Costa Rica
(Universidad Nacional (Costa Rica), 2015-12)En agosto y noviembre del año 2012, se realizaron dos campañas hidrográficas en la zona costera del Ca ribe sur de Costa Rica, entre el Puerto de Limón y la Laguna de Gandoca. Se utilizó un CTD (perfilador de conductividad, ... -
Caribbean and Adjacent Regions Tsunami Sources and Models (CATSAM) Map Viewer
(2018)Since 2011, UNESCO - Intergovernmental Oceanographic Commission (IOC) Experts Meetings and CaribeWave exercises have resulted in a variety of tsunami models of credible scenarios that would impact the Caribbean and adjacent ... -
Cálculo espectral de la irradiación solar directa, difusa y global en Heredia, Costa Rica
(Universidad Nacional (Costa Rica), 2008)Un modelo espectral en condiciones de cielos claros, el cual describe el flujo de irradiación solar, es verificado experimentalmente en Heredia, Costa Rica. Se presenta una descripción del modelo comparando sus resultados ... -
Cálculo y mapeo de la radiación solar directa y difusa en Costa Rica
(Universidad Nacional (Costa Rica), 2008)El conocimiento de la radiación solar directa y difusa es de importancia fundamental en la valoración del potencial energético de Costa Rica, por lo que este trabajo está enfocado en el cálculo y en el trazado de mapas de ... -
Characteristic atmospheric states during mid‑summer droughts over Central America and Mexico
(Springer, 2020-05-10)Annual precipitation over Central America and large areas of Mexico is typically characterised by its bimodal distribution, with a precipitation minimum in July to August that occurs between two separate maxima from May ... -
Characterization of the VARIAN®PaxScan 2020+ flat panel detector for quantitative X-ray imaging
(X-Ray Spectrometry vol.45 no.3 169-175 2016, 2016-02-19)In this work, the response of the VARIAN® PaxScan 2020+ flat panel detector was characterized in terms of spatial resolution and uniformity across the detection area along with detection efficiency for photon beams from ... -
Characterizing tsunami signals from the Hunga Tonga-Hunga-Ha’apai eruption and its effects on the Caribbean
(American Geophysical Union, 2022-12-13)The Hunga Tonga Hunga Ha'apai eruption of January 15 2022, was a rare geological event, resulting in atmospheric pressure waves being recorded around the world. The event caused significant environmental consequences, ... -
Cladocera (Crustacea, Branchiopoda) of a temporary shallow pond from northern Colombia
(Universidad Nacional Mayor de San Marcos, 2019)Eighteen species of cladocerans are recorded from a temporary pond in northern Colombia; 12 of these records are new for La Guajira Department: Diaphanosoma brevireme Sars, 1901, D. dentatum Herbst, 1968, Sarsilotona ... -
Coastal currents in the Eastern Gulf of Tehuantepec from coastal altimetry
(Advances in Space Research, 2018-06-02)we study the seasonal and interannual variability of the coastal currents along the eastern shelf of the Gulf of Tehuantepec. We use sea level from coastal altimetry distributed by the Centre de Topographie des Oceans et ... -
Comparative Study Of Conventional And Sbci Cardboard Solar Ovens
(Elsevier, 1992)Two folding and light solar ovens designed and constructed by Solar Box Cookers International (SBCI), Sacramento, U.S.A., have been studied experimentally. Furthermore, their performance is com pared with standard two ... -
Connecting bioloy, optics and nanomechanical properties in micro-wasps
(Springer Nature, 2020-01-29)Coloration in insects provides a fruitful opportunity for interdisciplinary research involving both physics and biology, and for a better understanding of the design principles of biological structures. In this research ... -
Considerations for functional food design based on starch-protein interactions: a systematic review
(Taylor and Francis Ltd., 2021-03-26)This systematic review aims to discuss the considerations in the design of starch-based foods from protein interactions, according to their functional, technological, and nutritional effects. Thereof, a systematic search ... -
Control de calidad de imagen y dosimetría, para mamografía digital, utilizando el fantoma Normi Mam Digital
(Universidad Nacional, Costa Rica, 2018-07-26)In Costa Rica there is not an explicit recommendation given by the Regulatory Authorities for the utilization of a specific Phantom; that is why experts have to explore what is offered in the market. One of the most ... -
Correlación entre algunos parámetros climáticos y la hora del día en Heredia, Costa Rica
(Universidad Nacional (Costa Rica), 1997)Se midieron las radiaciones solar global, infrarroja y ultravioleta, la presión atmosférica, la temperatura del aire, la humedad relativa y la velocidad del viento en Heredia, Costa Rica (latitud 10° 02’ N, longitud 84° ... -
Correlación entre la radiación solar global y el número de días con precipitación pluvial
(Universidad Nacional [Costa Rica], 1989-01-01)Este trabajo mide el grado de asociación entre datos experimentales de radiación solar global y número de días con precipitación en diez localidades de Costa Rica; con el objetivo de establecer relaciones para la estimación ... -
La creación de zonas de desarrollo próximo (ZDP) como estrategia de enseñanza-aprendizaje constructivista en la resolución de problemas lógico-matemáticos, en una clase de física del ciclo de educación diversificada de una institución pública costarricense.
(Universidad Nacional (Costa Rica), 2006) -
Dairy wastewater treatment by anaerobic fixed bed reactors from laboratory to pilot-scale plant: A case study in Costa Rica operating at ambient temperature
(Springer, 2013)The effect of hydraulic retention time in a range from 1.0-5.5 days was evaluated in a laboratory scale anaerobic fixed bed reactor packed with a hybrid material composed of tire rubber and zeolite. Under these conditions, ... -
Decadal Characterization of Indo-Pacific Ocean Subsurface Temperature Modes in SODA Reanalysis
(American Meteorological Society, 2015-04-29)Studies of decadal-to-multidecadal ocean subsurface temperature variability are fundamental to improving the understanding of low-frequency climate signals. The present study uses the Simple Ocean Data Assimilation (SODA) ...