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Now showing items 3690-3709 of 13252
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Drone-Based Hyperspectral and Thermal Imagery for Quantifying Upland Rice Productivity and Water Use Efficiency after Biochar Application
(MDPI AG, 2021-05-11)Miniature hyperspectral and thermal cameras onboard lightweight unmanned aerial vehicles (UAV) bring new opportunities for monitoring land surface variables at unprecedented fine spatial resolution with acceptable accuracy. ... -
Drones Swoop in to Measure Gas Belched from Volcanoes
(EOS. Science News by AGU, 2018-07-25)Los gases volcánicos son importantes herramientas de pronóstico de erupciones que se utilizan a menudo en el monitoreo de volcanes. Sin embargo, la recolección de muestras de gas requiere que los científicos ingresen a ... -
Drug Solubility Enhancement through the Preparation of Multicomponent Organic Materials: Eutectics of Lovastatin with Carboxylic Acids
(MDPI AG, 2019-03)Lovastatin (LOV) is a drug used to treat hypercholesterolemia. Recent studies have identified its antioxidant effects and potential use in the treatment of some types of cancer. However, the low bioavailability related ... -
DRUG USE AND ASSOCIATED FACTORS AMONG RURAL ADOLESCENTS IN COSTA RICA
(Universidad Nacional, Costa Rica., 2002)The objectives of this study, carried out in 1995, were to assess both licit and illicit substance use among rural male and female Costa Rican adolescents, and associated health, psy chological, and psychosocial problems. ... -
Dry-matter yields and crude protein and rumen degradable protein concentrations of three Arachis pintoi ecotypes at different stages of regrowth in the humid tropics
(Blackwell Publishing Ltd., 2005-08-15)Well-established stands of three ecotypes of Arachis pintoi (CIAT 17434, 18744 and 18748) were harvested from replicated plots (three blocks, each containing three plots for each ecotype) during the two dominant seasons ... -
El DUA en el proceso de enseñanza y aprendizaje en el contexto universitario en las ciencias de la salud
(Universidad Nacional, Costa Rica, 2022-08)En la educación superior existen grandes desafíos relacionados a la atención de la diversidad e inclusión en las aulas. Y las ciencias de la salud, no se escapan de esta realidad. Por lo que se plantea el modelo del Diseño ... -
Dueños responsables: concientizando, informando y viendo crecer
(Biocenosis publicación de la Universidad Estatal a Distancia, 2017-03-30)El ser humano y las especies domésticas guardan hoy en día una relación muy cercana, la cual puede favorecer la transmisión de agentes zoonóticos y causar enfermedad. Con el objetivo de crear conciencia sobre los propietarios ... -
Dung beetle and terrestrial mammal diversity in forests, indigenous agroforestry systems and plantain monocultures in Talamanca, Costa Rica
(Universidad Nacional, Costa Rica., 2006)In order to explore the importance of indigenous agroforestry systems for biodiversity conservation, we compared the abundance, species richness and diversity of dung beetles and terrestrial mammals across a gradient of ... -
Duration-amplitude distribution of volcanic tremor
(American Geophysical Union, 2003)The duration-amplitude distribution of volcanic tremor was examined in eight volcanoes and one geothermal area. An exponential model, implying a scale-bound source process, is found to be a better fit to the data than a ... -
Dust exposure in workers from grain storage facilities in Costa Rica
(Escuela de Ingeniería en Seguridad Laboral e Higiene Ambiental (EISLHA), Instituto Tecnológico de Costa Rica (ITCR), 2017)About 12 million workers are involved in the production of basic grains in Central America. However, few studies in the region have examined the occupational factors associated with inhalable dust exposure. About the ... -
Dynamic economic growth: a new method of approach
(Universidad Nacional, Costa Rica, 2020-12-03)This paper looks at Harrod’s fundamental assumptions and equations in ‘An essay in dynamic theory’ as the foundation for suggesting a better understanding of his postulates on economic growth. ... -
Dynamics of infections with gastrointestinal parasites and Dictyocaulus viviparus in dairy and beef cattle from Costa Rica
(Elsevier B.V, 2007-09-30)A longitudinal survey was carried out to determine and describe the prevalence and intensity of gastrointestinal parasite infections and Dictyocaulus viviparus in a dairy and a beef cattle farm of two different ecological ... -
E-commerce and coffee in Costa Rica: Case studies of costa rican roaster companies
(Proceedings - 2015 41st Latin American Computing Conference [CLEI], 2015-12-17)This paper presents the results of an exploratory multiple case study about the use of e-commerce for selling roasted coffee from Costa Rica. Four Costa Rican roasting companies are considered. This study is aimed at ... -
E-marketing in Costa Rican export companies: Results from a field survey
(IEEE EXPLORE, 2012-06-25)We present the results of a field survey aimed at analyzing ICT adoption and use, particularly related to e-marketing, in Costa Rican export companies. The e-commerce readiness/intensity/impact model, developed by the ... -
Early experiences of noise-sensitivity performance analysis of a distributed deep learning framework
(Institute of Electrical and Electronics Engineers (IEEE), 2022-10-18)Deep Learning (DL) applications are used to solve complex problems efficiently. These applications require complex neural network models composed of millions of parameters and huge amounts of data for proper training. This ... -
Early Toxic Effects in a Central American Native Fish (Parachromis dovii) Exposed to Chlorpyrifos and Difenoconazole
(Society of Environmental Toxicology and Chemistry, 2021-03-18)In Costa Rica, agriculture is one of the most important economic activities. Chlorpyrifos and difenoconazole have been identified as agrochemicals widely used in banana and pineapple crops in the Caribbean area of the ... -
Early-life exposure to Perfluoroalkyl substances and childhood metabolic function
(Environmental Health Perspectives, 2017-03-01)Background: Perfluoroalkyl substances (PFASs) are synthetic chemicals that may persist in the environment and in humans. There is a possible association between early-life PFAS exposure and metabolic dysfunction in later ... -
Earthquake and tsunami forecasts: Relation of slow slip events to subsequent earthquake rupture
(National Academy of Sciences, 2014-11-17)The 5 September 2012 Mw 7.6 earthquake on the Costa Rica subduction plate boundary followed a 62-y interseismic period. Highprecision GPS recorded numerous slow slip events (SSEs) in the decade leading up to the earthquake, ... -
Earthquake magnitude calculation without saturation from the scaling of peak ground displacement
(Geophysical Research Letters, 2015-06-02)GPS instruments are noninertial and directly measure displacements with respect to a global reference frame, while inertial sensors are affected by systematic offsets—primarily tilting—that adversely impact integration to ...