Browsing Facultad de Ciencias Exactas y Naturales by Title
Now showing items 2460-2479 of 2669
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Stable isotopes reveal groundwater to river connectivity in a mesoscale subtropical watershed
(Taylor and Francis Ltd., 2021)The Corumbataí River basin (São Paulo, Brazil) has a critical situation regarding water availability due to the intensive use to support agriculture and urbanization, requiring scientific information to face water demand. ... -
Stable isotopic characterizacion of nitrate wet deposition in the tropical urban atmosphere of Costa Rica
(Springer, 2021-07-13)Increasing energy consumption and food production worldwide results in anthropogenic emissions of reactive nitrogen into the atmosphere. To date, however, little information is available on tropical urban environments where ... -
Stable isotopic characterization of nitrate wet deposition in the tropical urban atmosphere of Costa Rica
(Research Square, 2021)Increasing energy consumption and food production worldwide results in anthropogenic emissions of reactive nitrogen into the atmosphere. To date, however, little information is available on tropical urban environments where ... -
Strategy of bioremediation in recirculating aquaculture systems using constructed microbial mats
(Journal of Chemical, Biological and Physical Sciences, 2014-11-30)Due to strict international standards, every day there is greater interest in developing environmentally sound treatment systems in aquaculture facilities that can remove contaminants from effluent and allows for the reuse ... -
Structure and Properties of Biodegradable Polymers: Rolling Effect in Poly (butylene succinate) Sheets
(SAGE Publishing (Estados Unidos), 2004)Sheets made from poly (butylene succinate) (PBS) were prepared by extrusion. They have been studied under uniaxial drawing as a function of the draw condition. Changes in molecular orientation and crystallinity were ... -
Student Camps to Promote Scientific Vocations in STEM: The Quimi Camp Case
(Universidad Nacional (Costa Rica), 2023-06-01)[Objetivo] Desde el año 1988 y hasta el año 2018, el estudiantado de secundaria en Costa Rica debía aprobar un examen final para graduarse de la escuela secundaria, y ser elegible para una educación universitaria pública. ... -
LAS SUGERENCIAS METODOLÓGICAS PARA LA ENSEÑANZA DE LA ARITMÉTICA EN EDUCACIÓN PRIMARIA EN COSTA RICA A FINALES DEL SIGLO XIX
(Reunión Latinoamericana de Matemática Educativa, 2018)El estudio que se presenta tiene como objetivo caracterizar la enseñanza de la aritmética en la Educación Primaria en Costa Rica en los albores de la fundación de la Escuela Normal en el siglo XX. Para esto, se analizan ... -
Supply and Demand of Human Resources in Computer Sciences in Costa Rica For Whom the Bell Tolls
(Infonomics Society, 2018)We analyze in this paper the supply and demand of human resources in computer sciences (CS) in Costa Rica. This is done with the aim of validating claims made by the local media about a large deficit of professionals for ... -
Surface-Water Quality of the Gulf of Papagayo, North Pacific, Costa Rica
(Universidad Nacional, Costa Rica, 2021-08-25)In recent years, the northwestern part of the North Pacific areas of Costa Rica has undergone rapid socioeconomic development. This situation, combined with the scarce available information about the water quality of the ... -
Sustainability assessment based on stakeholders’perceptionof tourism activities in Loreto Bay National Park, Mexico
(Centro de Investigación en Alimentación y Desarrollo, A. C, 2022-11-22)Objective: To assess the level of sustainability, based on stakeholders’ tourism perceptions of Loreto Bay National Park (LBNP) in Mexico. Methodology: Indicators were selected and organized in three components: (1) ... -
Synthesis of a metal chelating monomer for radiation polymer dosimetry
(Elsevier Ltd, 2021-03)To enhance the performance of polymeric dosimeters it is necessary to design novel formulations considering the mechanisms that register the absorbed dose (e.g. induced polymerization) and the readout method. The combination ... -
Synthesis of Dihydroindolo[2,3-c]carbazole as Potential Telomerase Inhibitor
(Journal of Heterocyclic Chemistry vol.53 no.3 762-766 2015, 2015-05-27)The dictyodendrins A-E were the first marine natural products that show inhibition of telomerase. A versatile and convergent route was described for the synthesis of derivatives of these pyrrolo[2,3-c]carbazole alkaloids ... -
Taller Creando la ecuación de la circunferencia. CONCITES. XIII FIMAT 2022
(Universidad Nacional (Costa Rica), 2022-09-02)El fortalecimiento de la Geometría Analítica en el currículo de secundaria costarricense ha traído la necesidad de contar con herramientas didácticas y nuevas metodologías, para desarrollar en los estudiantes las ... -
Taller de programación con circuitos
(Universidad Nacional de Ingeniería Managua (Nicaragua), 2021)El taller les permite a las personas participantes conocer el software Tinkercad y la placa Arduino con el fin de hacer que la programación con circuitos sea accesible para todos -
Tamaño poblacional, distribución y uso de habitat de dos especies simpatricas de delfines en el refugio nacional de vida silvestre Gandoca - Manzanillo Costa Rica
(Universidad Nacional (Costa Rica), 2009)Alrededor de 30 especies de cetáceos habitan aguas costarricenses, pero solamente seis especies han sido confirmadas para la costa Caribe de Costa Rica. Las dos especies costeras más comunes son el delfin de Guyana (Sotalia ... -
Tamaños y proporción sexual de Ucides occidentalis (Crustacea: Gecarcinidae) en un manglar de Costa Rica
(Universidad Nacional (Costa Rica), 1995-02-22)Sizes and sex ratios of Ucides occidentalis (ORT-MANN 1897) were studied in the mangrove area of Estero Panama, Guanacaste, Costa Rica, from March to August 1982. The caparace length was 36.7-84.5 mm for males and 36.00-60.8 ... -
Tasa de filtración del ostión de manglar, ( Crassostrea rhizophorae, Guilding 1828), a diferentes salinidades y temperaturas
(Universidad de Costa Rica (Costa Rica), 1985-06-01)Se analizaron los valores de la tasa de filtración con rojo neutro en 60 ostras de mangra, Crassostrea rhizophorae, en dos experimentos; uno con salinidades de 10, 20, 25, 30 y 35%0 a una temperatura constante de 24°C y ... -
TASys, Sistema para el control de la documentación de pruebas de software elaborado para la empresa Netsoft de Costa Rica
(Universidad Nacional (Costa Rica), 2012)Se presenta el documento de proyecto del sistema TASys para el control de la documentación de pruebas de software desarrollado como trabajo de graduación para optar por el grado de Licenciatura en Informática con énfasis ... -
Taxonomía y ultraestructura de algunas especies de dinoflagelados del Golfo de Nicoya, Costa Rica
(Universidad Nacional (Costa Rica), 2001)El estudio taxonómico de los dinoflagelados debe involucrar métodos de microscopia de luz y electrónica debido al gran número de especies; a la gran diversidad de éstas y al tamaño de los organismos. Se trabajaron muestras ... -
Teacher Reflection on a Teaching-Learning Situation Regarding the Concept of Relation in Secondary Education
(Universidad Nacional, Costa Rica, 2022-01-31)This study is part of the research in didactics of mathematicson teacher training. In particular, the study focuses on the knowledge of mathematics teachers, taking as a reference the theoretical ...