Browsing Facultad de Ciencias Exactas y Naturales by Title
Now showing items 2425-2444 of 2649
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Snake diversity (squamata: Serpentes) in Quebrada González sector of Braulio Carrillo National Park, Costa Rica
(Malcolm L. McCallum, 2019-04-30)Within Braulio Carrillo National Park (BCNP) of Costa Rica, there is a lack of quantitative data regarding the snake community despite its informally reported abundance and relevance to human health. The objective of this ... -
Sobre el transporte de partículas en cuerpos oceánicos semicerrados (ING)
(Universidad Nacional (Costa Rica), 1984-07-01)El flujo residual ha mostrado tener una función relevante en el transporte de partículas en suspensión, larvas y algunos contaminantes, principalmente. Este se establece como consecuencia de la interacción entre la onda ... -
Social effects in growth experiments. Growth of jaguar guapote (Cichlasoma managuense) in isolation and in small groups
(Universidad Nacional (Costa Rica), 1997)Se evaluaron el crecimiento y la conversión alimenticia de juveniles de guapote tigre (Cichlasoma managuense) mantenidos a densidades constantes de 1, 2, 5, 10 y 20 individuos por pecera. La densidad mostró una correlación ... -
Social Media and Enderly people: Research Trends
(Springer, 2017-05)Population aging is now a global reality a global reality, and interaction with social media as well. The older adult population is increasing significantly and their mental and physical health will be a worldwide priority. ... -
Software de apoyo a la administración de granjas de servidores
(Universidad Nacional (Costa Rica), 2004)Conforme pasa el tiempo las empresas dependen cada vez más de la tecnología para ejecutar sus operaciones, tanto las que son propias del negocio como las que son de apoyo a sus actividades; es por eso que se han visto en ... -
Software educativo para álgebra elemental operaciones con polinomios
(Universidad Nacional, 1998)El proyecto pretende brindar un aporte a la educación por parte de la informática, presentando un software educativo el cual pueda servir como paradigma para seguir. Este software se diseña apoyado en las nuevas tecnologías ... -
Solución alternativa para la transformación directa de la información geográfica: el caso de Costa Rica ante el cambio del Sistema oficial de Coordenadas (Lambert a CRTM05)
(Universidad Nacional (Costa Rica), 2014)En Costa Rica se utilizó durante muchos años oficialmente una cartografía basada en el sistema de proyección Lambert, datum Ocotepeque. En el año 2007 se establece el sistema CR05 como siste-ma de referencia oficial, lo ... -
¿Son los huevos —retenidos y alimentados por la madre— la forma ancestral de reproducción en los onicóforos?
(Universidad de Costa Rica (Costa Rica), 2019)Los onicóforos son el único filo sin representantes marinos actuales y uno de los pocos invertebrados con placenta. Acá proponemos que el antecesor común, el cual salió por primera vez a tierra firme en tiempos de Pangea, ... -
Spatial and Temporal Variation of Stable Isotopes in Precipitation across Costa Rica: An Analysis of Historic GNIP Records
(2013-11-27)The location of Costa Rica on the Central American Isthmus creates unique microclimate systems that receive moisture inputs directly from the Caribbean Sea and the Pacific Ocean. In Costa Rica, stable isotope monitoring ... -
Spatial variation of physicochemical parameters in a constructed wetland for wastewater treatment: An example of the use of the R programming language
(Universidad Estatal a Distancia (Costa Rica), 2021-06)Introduction: The implementation of wastewater treatment systems such as constructed wetlands has a growing interest in the last decade due to its low cost and high effectiveness in treating industrial and residential ... -
Specialized Knowledge of Prospective Mathematics Teachers on the Concept of Mathematical Proof
(Universidad Nacional (Costa Rica), 2024-01)[Objetivo] En este artículo, se presentan los resultados de una investigación cualitativa de carácter descriptivo que tiene como objetivo caracterizar el conocimiento especializado de los profesores ... -
Specialized Knowledge of Prospective Mathematics Teachers on the Concept of Mathematical Proof
(Universidad Nacional (Costa Rica), 2024)[Objetivo] En este artículo, se presentan los resultados de una investigación cualitativa de carácter descriptivo que tiene como objetivo caracterizar el conocimiento especializado de los profesores de matemáticas en ... -
Species diversity and distribution of genus Pampus (Pelagiaria: Stromateidae) based on global mitochondrial data
(Universidad Nacional (Costa Rica), 2022-12-13)Due to the highly similar external morphology of the Pampus species, misidentifications frequently occur and hinder the understanding of the taxonomy and species distributions of the genus. In this study, we generated 271 ... -
Spontaneous spawning in captivity of the first generation hatchery-produced weakfish, Cynoscion squamipinnis (Perciformes: Sciaenidae)
(Universidad Nacional (Costa Rica), 2017-01)The aim of this study was to evaluate the spontaneous spawning of the first generation of weakfish (Cynoscion squamipinnis) reared in captivity in order to conduct restocking programs and mariculture projects. Juveniles ... -
Spontaneous spawning, ontogeny and growth in captivity of Cynoscion squamipinnis
(Universidad de Costa Rica, 2016-09-03)The croakers or drums are commercial species, which have been overfished in the Nicoya Gulf, Costa Rica. This study aimed to describe, for the first time, the reproduction and the ontogeny of weakfish, Cynoscion squamipinnis ... -
Spotted rose snapper (Lutjanus guttatus) aquaculture research and development as socio-economic alternative for Costa Rican fishing communities
(2010-06-01)The spotted rose snapper (Lutjanus guttatus) is one of the main target coastal species, but landings are decreasing in quantity and size. Reports include a mean capture size of 50 cm with gill nets and 38 cm with bottom ... -
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 ...