Now showing items 22-41 of 2471

    • A new giant velvet worm from Costa Rica suggests absence of the genus Peripatus (Onychophora: Peripatidae) in Central Americ 

      Barquero González, José Pablo; Sánchez-Vargas, Steven; Morera, Bernal (Universidad de Costa Rica, 2020-02-03)
      Introduction: Neotropical onychophoran taxonomy and diversity has been poorly investigated. Recent studies have discovered problems in species classification: they have questioned the accepted genera and the actual number ...
    • A New Hybrid of Serpocaulon (Polypodiaceae) from Costa Rica 

      Rojas Alvarado, Alexander; Chaves-Fallas, José Miguel (Bio One Research Evolved, 2013)
      A new hybrid Serpocaulon 3 sessilipinnum A. Rojas & J.M. Chaves is described. The new taxon has characters intermediate between S. fraxinifolium (Jacq.) A.R. Sm. and S. ptilorhizon (Christ) A.R. Sm., which are related ...
    • A new species of Elaphoglossum Schott ex J. Sm. (Dryopteridaceae) from Costa Rica 

      Rojas Alvarado, Alexander; Muñoz-Cambronero, Pablo Elías (Universidad Nacional (Costa Rica), 2017-12)
      Una especie nueva de Elaphoglossum Schott ex J.Sm. Dryopteridaceae) para Costa Rica.Una especie nueva de ElaphoglossumSchott ex J. Smde la sección UndulataChrist es descrita aquí: Elaphoglossum pallidosquamum A. Rojas & ...
    • A new species of Seticeros from Costa Rica (Coleoptera, Cerambycidae, Prioninae) 

      Ramírez Campos, R.; Esteban Duran, J.R.; Santos Silva, A. (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), 2011)
      A new species of Seticeros Perger & Santos-Silva, 2010 (Prioninae: Callipogonini) from San Isidro del General, San José, Costa Rica is described and illustrated. A key to the species of Seticeros is added.
    • A new vanilla species from Costa Rica closely related to V. planifolia (Orchidaceae) 

      Azofeifa Bolaños, José B.; Gigant, L. Rodolphe; Nicolás García, Mayra; Pignal, Marc; Tavares González, Fabiola B.; Hagsater, Eric; Salazar, Gerardo; Reyes Lopez, Delfino; Archila Morales, Fredy Leonel; García-García, José A.; Da Silva, Denis; Allibert, Agathe; Solano Campos, Frank; Rodríguez Jimenes, Guadalupe del Carmen; Paniagua Vásquez, Amelia; Besse, Pascale; Pérez Silva, Araceli; Grisoni, Michel (European Journal of Taxonomy, 2017-02-22)
      We describe a new vanilla species growing in sympatry with Vanilla planifolia Jacks. ex Andrews (Orchidaceae) in the province of Limón, Caribbean coast of Costa Rica. The morphology of the reproductive and vegetative organs ...
    • A novel host-adapted strain of SalmonellaTyphimurium causes renal disease in olive ridley turtles (Lepidochelys olivacea) in the Pacifc 

      Work, Thierry; Dagenais, Julie; Stacy, Brian; Ladner, Jason T; Lorch, Jeffrey M; Balazs, George H; Barquero Calvo, Elías; Berlowski-Zier, Brenda; Breeden, Renee; Corrales Gómez, Natalia; González Barrientos, Rocío; Harris, Heather S.; Hernández Mora, Gabriela; Herrera-Ulloa, Angel; Hesami, Shoreh; Todd Jones, T.; Norton, Terry M.; Rameyer, Robert A.; Taylor, Daniel R.; Waltzek, Thomas B. (Springer Nature, 2019-06)
      Salmonella spp. are frequently shed by wildlife including turtles, but S. enterica subsp. enterica serovar Typhimurium or lesions associated with Salmonella are rare in turtles. Between 1996 and 2016, we necropsied 127 ...
    • A posteriori error analysis of a mixed virtual element method for a nonlinear Brinkman model of porous media flow 

      Munar, Mauricio; Sequeira, Filander (Elsevier Ltd, 2020-06-25)
      In this paper we present an a posteriori error analysis of a mixed-VEM discretization for a nonlinear Brinkman model of porous media flow, which has been proposed by the authors in a previous work. Therein, the system ...
    • A preliminary isotope-based evapotranspiration partitioningapproach for tropical Costa Rica 

      Iraheta, Alberto; Birkel, Christian; Benegas, Laura; Ríos, Ney; Sánchez-Murillo, Ricardo; Beyer, Matthias (John Wiley and Sons Ltd, 2021-07)
      Spatially and seasonally distributed information on transpiration (T) fluxes is limited in the tropics. Here, we applied a coupled isotope mass balance model to separate water fluxes of T and evapotranspiration (ET) from ...
    • A preliminary market research about tambaqui (Colossoma macropomum) in Costa Rica 

      van Anrooy, Raymon; Günther, Jorge; Boza Abarca, Jorge ; Gálvez, Nazira (Universidad Nacional (Costa Rica), 1996)
      En los meses de enero a julio de 1995 se desarrolló una prueba de mercado con el pez de agua dulce “Tambaqui” (Colossoma macropomum) en Costa Rica. Unos 1200 peces de aproximadamente 800g peso promedio se obtuvieron de la ...
    • A priori and a posteriori error analyses of a pseudostress-based mixed formulation for linear elasticity 

      Gatica, Gabriel N.; Gatica, Luis F.; Sequeira, Filánder A. (Computers and Mathematics with Applications vol.71 no.2 585-614 2016, 2016-01-02)
      In this paper we present the a priori and a posteriori error analyses of a non-standard mixed finite element method for the linear elasticity problem with non-homogeneous Dirichlet boundary conditions. More precisely, the ...
    • A Priori and a Posteriori Error Analyses of an Augmented HDG Method for a Class of Quasi-Newtonian Stokes Flows 

      Gatica, Gabriel; Sequeira, Filander (Springer, 2016-12)
      In a recent work we developed a new hybridizable discontinuous Galerkin (HDG) method for a class of nonlinear Stokes models arising in quasi-Newtonian fluids. The approach there uses the incompressibility condition to ...
    • A priori and a posteriori error analyses of an HDG method for the Brinkman problem 

      Gatica, Luis; Sequeira, Filánder (Elsevier, 2018-01-15)
      In this paper we introduce and analyze a hybridizable discontinuous Galerkin (HDG) method for the linear Brinkman model of porous media flow in two and three dimensions and with non-homogeneous Dirichlet boundary conditions. ...
    • A proposal for implementing PBL in programming courses 

      Mora, Sonia; Coto, Mayela; Alfaro Salazar, Georges (XL Latin American Computing Conference, CLEI 2014, 2014)
      In the search of teaching strategies more consistent with the current needs of the industry and with the new university pedagogical model, an action research project was carried in the programming courses of the study ...
    • A proposed solution to the species problem in velvet worm conservation (Onychophora) 

      Sosa-Bartuano, Ángel; Monge Nájera, Julián; Morera, Bernal (Universidad Estatal a Distancia, 2018)
      Onychophorans or velvet worm are the only phylum without extant marine species and the only invertebrates with a true placenta, but most species are rare and thus more likely to become extinct. A key obstacle for ...
    • A RTk - P-k approximation for linear elasticity yielding a broken H(div) convergent postprocessed stress 

      Gatica, Gabriel N.; Gatica, Luis F.; Sequeira, Filander (Universidad Nacional, Costa Rica, 2015)
      We present a non-standard mixed finite element method for the linear elasticity problem in R-n with non-homogeneous Dirichlet boundary conditions. More precisely, our approach is based on a simplified interpretation of the ...
    • A Selective Ion HPLC-APCI-MS Method for the Quantification of Pentacyclic Triterpenes in an Anxiolytic Botanical Dietary Supplement for the Animal Health Market 

      Liu, Rui; Carballo Arce, Ana Francis; Singh, Ranpreet; Saleem, Ammar ; Rocha, Marco; Mullally, Martha; Otarola-Rojas, Marco; Poveda Alvarrez, Luis; Sanchez-Vindas, Pablo; Garcia, Mario; Baker, John; Merali, Zul; Guerrero-Analco, José A.; Durst, Tony; Harris, Cory; Arnason, John (Natural Product Incorporation, 2019)
      A new anti-anxiety dietary supplement was developed for the animal health market, by combining 2 triterpene containing botanicals, Souroubea sympetala (Marcgraviaceae) with Platanus occidentalis (Platanaceae) A validated ...
    • A simple method for short-term storage and transportation of spermatophores of Pacific white shrimp (Litopenaeus vannamei) 

      Morales Ureno, Karina; Paniagua Chávez, Carmen; Martínez- Ortega, Alfonso; Castillo - Juárez, Héctor; Alfaro-Montoya, Jorge (Hidrobiológica vol.26 no.1 9-14 2016, 2016)
      The development of a shipping method for spermatophores of the white shrimp Litopenaeus vannamei would open new opportunities for sharing and improving genetic resources of shrimp worldwide. Seventy spermatophores were ...
    • A study of the social perception of technology in public spaces in Alajuela Central Cantón, Costa Rica 

      Víquez Víquez, Andrés; Hernández Ruiz, Irene; Pérez Gutiérrez, Fabián (Institute of Electrical and Electronics Engineers Inc., 2019-08-20)
      The present work makes an analysis of the results of a study of the social perception of technology applied in the public spaces of the central canton of Alajuela, Costa Rica. This study is of a non-probabilistic type, ...
    • Abandono temprano en estudiantes universitarios: un estudio de cohorte sobre sus posibles causas 

      Rodriguez Pineda, Magaly; Zamora Araya, José Andrey (Universidad Nacional, Costa Rica, 2021-01-31)
      El objetivo principal de esta investigación es conocer las razones por las cuales un estudiante de primer ingreso se puede convertir en un desertor temprano; se estudia el caso particular de la Universidad ...
    • Abelian covers of alternating groups 

      Barrantes, Daniel; Hill, Nick; Ramírez, Jeremías (Archiv der Mathematik 107 135-150, 2016-07-07)
      Let G = A n , a finite alternating group. We study the commuting graph of G and establish, for all possible values of n barring 13, 14, 17, and 19 whether or not the independence number is equal to the clique-covering number.