Browsing Artículos científicos by Title
Now showing items 25-44 of 109
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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) ... -
Deforestation processes in the livestock territory of La Vía Láctea, Matagalpa, Nicaragua
(Taylor and Francis Ltd., 2019-05-04)Land-use change is considered one of the main causes of environmental degradation. Thus, its analysis will allow stakeholders to make reasonable decisions for land management. The objective of the present study was ... -
La depresión tectónica de Nicaragua en Costa Rica: estructura interna, estilo estructural, edad, extensión y actividad de la cuenca de San Carlos
(Universidad de Costa Rica, 2021-05-05)Nicaragua’s tectonic depression extends from El Salvador to the plains in northern Costa Rica and is limited by strike-slip faults with a normal component. Based on a set of unpublished seismic lines, ... -
Desarrollo de materiales poliméricos para dosimetría de rayos-x con sensibilidad óptica mejorada
(Centro de Investigaciones en Laseres y Aplicaciones, 2020-10)En este trabajo se estudia el uso de un nuevo agente, capaz de formar complejos coloreados con iones metálicos, para su uso en dosimetría de Rayos-X (RX), con el objetivo de evaluar su efecto sobre la sensibilidad a la ... -
Descifrando el clima espacial: ciclos solares y ondas magnéticas de Rossby
(Revista Uniciencia, Universidad Nacional, 2019-07)El objetivo de esta investigación es explorar si existe una relación entre las ondas magnéticas de Rossby rápidas o lentas y ciertas observaciones de la actividad solar de largo y muy largo plazo (meses, años, décadas…). ... -
Description of chlorophyll <i>a</i> spatial distribution, temperature and salinity on the continental shelf and slope of the Central American Caribbean
(Universidad Nacional (Costa Rica), 2017-01)Con la coordinación regional de la Organización del Sector Pesquero y Acuícola del Istmo Centroamericano (OS-PESCA), se llevó a cabo del 3 de enero al 3 de febrero del año 2011 una campaña ... -
Design, construction and experimental study of electric cum solar oven-II
(1989)As in many developing countries,35-401 of the population of Costa Rica still use firewood for domestic cooking.Considering the fact that Costa Rica is blessed with good sunshine,good hydroelectric potential,and there ... -
Design, construction and study of a hybrid solar food processor in the climate of Costa Rica
(Elsevier, 2007)During the last 25 years, the author has designed, constructed, studied and promoted solar oven, hybrid solar/electric oven, solar oven cum drier, solar cooker cum water heater and solar still. In different parts of the ... -
Determinación de la Altura dinámica a partir de perfiles de temperatura
(Universidad Nacional (Costa Rica), 1986-01-01)La altura dinámica se calcula solo a partir de los datos de temperatura mediante el uso de una relación TS media para proporcionar valores de salinidad. El método se ha aplicado a datos de cruceros: EASTROPIC (1967) y ... -
Dose-response of Fricke- and PAGAT-dosimetry gels in kilovoltage and megavoltage photon beams: Impact of LET on sensitivity
(Associazione Italiana di Fisica Medica, 2021-04-07)Purpose: Dosimetry of ionizing radiation quantifies the energy deposited by an incident beam to the medium. This study presents the relative response of two types of gel dosimeters describing their differences by estimating ... -
Economic Analysis Of Domestic Solar Still In The Climate Of Costa Rica
(Universidad Nacional (Costa Rica), 1990)-In many communities of the developing countries, including Costa Rica and especially in coastal areas, there exists a shortage of potable water. Taking into account the fact that transportation/distribution of potable ... -
Effect of inorganic salts and matrix crosslinking on the dose response of polymer gel dosimeters based on acrylamide
(Elsevier Ltd, 2018-07-17)The use of additives in polymer gel dosimeters to enhance their sensitivity or to improve their performance is of great importance for their application in radiomedicine. Inorganic salts have been used as additives with ... -
Effectiveness of N-waves for predicting morphological changes due to tsunamis
(Elsevier, 2018)The research on morphological changes caused by tsunamis has increased considerably in the last few years, yet the processes behind this phenomenon are still not fully understood. This paper analyzes and compares numerical ... -
Efficiency measurement and Monte Carlo simulations of a CeBr3 scintillator
(Applied Radiation and Isotopes Vol.120. 71-75 2016, 2016-11)CeBr3 crystals meet many of the demands of high performance scintillators, due to their excellent timing properties, good effective Z and high photon yield. It is important to characterize their efficiency and to verify ... -
Electrochemical Characterization of Mancozeb Degradation for Wastewater Treatment Using a Sensor Based on Poly (3,4-ethylenedioxythiophene) (PEDOT) Modified with Carbon Nanotubes and Gold Nanoparticles
(MDPI AG, 2019)Mancozeb is a worldwide fungicide used on a large scale in agriculture. The active component and its main metabolite, ethylene thiourea, has been related to health issues. Robust, fast, and reliable methodologies to quantify ... -
Electrochemical Hydrogen Oxidation on Pt(100): a Combined Direct Molecular Dynamics/Density Functional Theory Study
(Electrocatalysis, 2015-08-09)We have studied the hydrogen oxidation reaction on various catalytic sites at the water/Pt(100) interface with first-principles direct molecular dynamics and minimum energy pathway calculations. The calculations indicate ... -
Estimación de la radiación solar global incidente en superficies inclinadas
(Universidad Nacional, Costa Rica, 1992-01-01)Se estimaron valores diarios medios mensuales de la radiación solar global incidente sobre un colector solar inclinado, orientado hacia el sur, con datos observados o estimados de la radiación solar global, directa o ... -
Estructura del fitoplancton en las épocas seca y lluviosa en el golfo de Papagayo, Costa Rica
(Universidad Nacional (Costa Rica), 2018-07)Con el propósito de estudiar la estructura de la comunidad fitoplanctónica en el golfo de Papagayo, se realizaron 2 muestreos en febrero y junio del 2017, y se analizó adicionalmente información hidrográfica. Su composición ... -
Estructura hidrográfica de la bahía de Bluefields, Nicaragua
(Universidad Nacional (Costa Rica), 2009)En marzo y octubre del 2000, entre las actividades del Proyecto DIPAL II (Proyecto para el Desarrollo Integral de la Pesca Artesanal en la Región Autónoma del Atlántico Sur, Nicaragua), se realizaron dos campañas hidrográficas ...
