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Now showing items 3693-3712 of 13228

    • E-commerce and coffee in Costa Rica: Case studies of costa rican roaster companies 

      Mata, Francisco J.; Quesada, Ariella (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 

      Mata, Francisco; Quesada, Ariella (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 

      Rojas, Elvis; Knobloch, Michael; Daoud, Nour; Meneses, Esteban; Mohr, Bernd (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 

      Jiménez, Katherine; Solano, Karla; Scholz, Carola; Redondo López, Sergei; Mena, Freylan (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 

      Fleisch, Abby F.; Rifas-Shiman, Sheryl L.; Mora, Ana Maria; Calafat, Antonia M.; Ye, Xiaoyun; Gibson, Heike; Gillman, Matthew W.; Oken, Emily; Sagiv, Sharon (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 

      Dixon, Timothy H.; Jiang, Yan; Malservisi, Rocco; McCaffrey, Robert; Voss, Nicholas; Protti, Marino; Gonzalez, Victor (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 

      Melgar, Diego; Crowell, Brendan; Geng, Jianghui; Allen, Richard; Bock, Yehuda; Riquelme, Sebastian; Hill, Emma; Protti, Marino; Ganas, Athanassios (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 ...

    • Eclesiología latinoamericana 

      Fuentes Matute, César Augusto; Mora Castillo, Magalli; Soto Soto, José Francisco (Universidad Nacional (Costa Rica). Escuela Ecuménica y Ciencias de la Religión, 2016)
      Realiza una relectura de la historia plural de Costa Rica desde las experiencias eclesiales locales. Trata de generar un proceso de trabajo grupal e individual que ayude repensar las prácticas sociales, pastorales y ...

    • La eco-alfabetización en el manejo de los residuos sólidos : un paso a la conciencia ambiental 

      Arce Salas, Ana Mayela; Díaz Chavez, Shirley; Villalobos Zúñiga, Ana Lucía (Universidad Nacional (Costa Rica), 2018-11-22)
      Esta investigación tuvo como propósito medir y analizar el conocimiento y la actitud ambiental en un grupo representativo de la comunidad educativa del Liceo Ing. Manuel Benavides Rodríguez, ubicado en el cantón central ...

    • Ecofeminismo 

      Bohorquez Sánchez, Marlene (Universidad Nacional, Costa Rica, 1997)
      El feminismo y la ecología, en cierto modo, no son dos movimientos diferentes. La violencia contra la mujer y contra la naturaleza se refuerzan mutuamente. El Ecofeminismo une estas realidades, pretende la libración de la ...

    • Ecological control of Triatoma dimidiata (Latreille, 1811): five years after a Costa Rican pilot project 

      Zeledón, Rodrigo; Rojas, Julio C; Urbina, Andrea; Cordero, Marlen; Gamboa, Sue H; Lorosa, Elias S; Alfaro, Sergio (Instituto Oswaldo Cruz, 2008)
      An ecological pilot project for the control of Triatoma dimidiata allowed a new evaluation four and five years after environmental modifications in the peridomestic areas of 20 households. It was verified that the two ...

    • Ecological corridors in Costa Rica: An evaluation applying landscape structure, fragmentation-connectivity process, and climate adaptation 

      Morera Beita, Carlos; Sandoval Murillo, Luis Fernando; Alfaro Alvarado, Luis Diego (Society for Conservation Biology, 2021-05-20)
      In recent years, ecological corridors have been proposed on a global scale as a response to the accelerated process of natural ecosystem fragmentation, mainly as a result of human impact. In accordance with this trend, ...

    • Ecological Integrity Impairment and Habitat Fragmentation for Neotropical Macroinvertebrate Communities in an Agricultural Stream 

      Echeverría-Sáenz, Silvia; Ugalde-Salazar, Rocío; Guevara-Mora, Meyer; Quesada-Alvarado, Francisco; Ruepert, Clemens (Multidisciplinary Digital Publishing Institute (MDPI) (Suiza), 2022)
      The Volcán River watershed in the south Pacific of Costa Rica comprises forests, small urban settlements, cattle fields, and intensive agriculture (mostly pineapple and sugarcane). The ecological integrity and quality ...

    • Ecological patterns of blood-feeding by kissing-bugs (Hemiptera: Reduviidae: Triatominae) 

      Rabinovich, Jorge; Kitron, Uriel; Obed, Yamila; Yoshioka, Miho; Gottdenke, Nicole; Chaves, Luis Fernando (Instituto Oswaldo Cruz, 2011-06)
      Host use by vectors is important in understanding the transmission of zoonotic diseases, which can affect hu mans, wildlife and domestic animals. Here, a synthesis of host exploitation patterns by kissing-bugs, vectors of ...

    • Ecología de Larvas de peces: I. Ecología alimenticia 

      Rodríguez, J. A.; Carrillo, E. (UNICIENCIA, 1984-07-01)
      RESUMEN Estudio de huevos y estados larvales de peces marinos ya que existen como una simbiosis sobre los primeros estadios de vida del pez. Su importancia recae en la aplicación a través de los estudios sobre taxonomía, ...

    • Ecología de las especies ícticas más importantes en la margen costarricense del Río San Juan 

      Ross Salazar, Erick (Universidad Nacional (Costa Rica), 2005)
      El Río San Juan, en el Atlántico Norte de Costa Rica, posee diversas especies de importancia comercial, como lo son el tepemechín (Agonostomus monticola), la machaca (Brycon guatemalensis), el bobo (Joturus pichardi), el ...

    • La ecología olvidada : una reflexión. 

      Rueda Q., José A.; Guardia R., Sonia (Universidad Nacional, Costa Rica, 1992)

    • Ecología trófica de tiburones toro juveniles (carcharhinus leucas) en dos sistemas estuarinos de Costa Rica 

      De la Llata Quiroga, Edna (Universidad Nacional, Costa Rica, 2021-05)
      El tiburón toro (Carcharhinus leucas) es un depredador tope capaz de moverse entre ambientes de agua dulce y agua salada en zonas tropicales y subtropicales del mundo. Esta especie utiliza los sistemas estuarinos como áreas ...

    • Ecología urbana de abejas y educación ambiental : un estudio de caso en Escazú, Costa Rica 

      Acuña Cordero, Mariana (Universidad Nacional, Costa Rica, 2019)
      Las abejas nativas poseen una gran importancia ecosistémica, debido a los servicios de polinización que permiten la perpetuidad de los bosques y cultivos. Además, mediante la apicultura y meliponicultura, favorecen la ...

    • Ecología y persona adulta mayor 

      León Fernández, Maribel; San Lee Campos, Francisco; Monge Barrantes, Ana Luz; Cascante Fonseca, Mayela (Universidad Nacional, Costa Rica, 2006)
      El programa de "El Adulto mayor" del Centro de Estudios Generales de la UNA, ha logrado insertarse en nuestra comunidad Universitaria y nacional Ha brindado apoyo e iniciativas en la realización de tareas urgentes para ...