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Now showing items 61-80 of 13266
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A mixed virtual element method for quasi-Newtonian stokes flows
(SIAM, 2018)In this paper we introduce and analyze a virtual element method (VEM) for an augmented mixed variational formulation of a class of nonlinear Stokes models arising in quasi-Newtonian fluids. While the original unknowns are ... -
A mixed virtual element method for the boussinesq problem on polygonal meshes
(Global Science Press, 2021)In this work we introduce and analyze a mixed virtual element method (mixed-VEM) for the two-dimensional stationary Boussinesq problem. The continuous formulation is based on the introduction of a pseudostress tensor ... -
A mixed virtual element method for the Brinkman problem
(Mathematical Models and Methods in Applied Sciences vol.27 no.4 707-743 2017, 2017)In this paper, we introduce and analyze a mixed virtual element method (mixed-VEM) for the two-dimensional Brinkman model of porous media flow with non-homogeneous Dirichlet boundary conditions. More precisely, we employ ... -
A Monte Carlo Study of the Photon Spectrum due to the Different Materials Used in the Construction of Flattening Filters of LINAC
(Hindawi, 2017-07-10)Different types the spectrum of photons were studied; they were emitted from the flattening filter of a LINAC Varian 2100 C/D that operates at 15 MV. The simplified geometry of the LINAC head was calculated using the MCNPX ... -
A new Costa Rican species of Drosophila visiting inflorescences of the hemi-epiphytic climber Monstera lentii (Araceae)
(Universidad Nacional, Costa Rica, 2018-09)Drosophila monsterae sp. nov. is described from 11 males and 13 females collected from the inside of closed inflorescences of Monstera lentii (Araceae) at 1810 m altitude in the Forest Reserve of Cerro de La Carpintera, ... -
A new dagger nematode, Xiphinema tica n. sp. (Nematoda: Longidoridae), from Costa Rica with updating of the polytomous key of Loof and Luc (1990)
(Springer, 2017-05-15)A new dagger nematode, Xiphinema tica n. sp., is described and illustrated from several populations extracted from soil associated with several crops and wild plants in Costa Rica. The new dagger nematode is characterised ... -
A new giant species of placented worm and the mechanism by which onychophorans weave their nets (Onychophora: Peripatidae)
(Universidad de Costa Rica, 2010)Onychophorans, or velvet worms, are poorly known and rare animals. Here we report the discovery of a new species that is also the largest onychophoran found so far, a 22cm long female from the Caribbean coastal forest of ... -
A new giant velvet worm from Costa Rica suggests absence of the genus Peripatus (Onychophora: Peripatidae) in Central Americ
(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
(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 method for the detection of phospholipase A2 variants: Identification of isozymes in the venoms of newborn and adult Bothrops asper (terciopelo) snakes
(Elsevier B.V, 1988)E. Moreno, A. Alape, M. Sánchez and J. M. Gutiérrez. A new method for the detection of phospholipase A2 variants: identification of isozymes in the venoms of newborn and adult Bothrops asper (terciopelo) snakes. Toxicon ... -
A new nesting record for the jabiru in Costa Rica
(Universidad Nacional, Costa Rica, 1988)I document the first nesting record of the jabiru (Jabiru mycteria) in "Los Guatuzos" forest floodplain, Alajuela province, Costa Rica. The active nest was located in March 1995 at 10°49'23.70"N and 84°47'23.2"W. The nest ... -
A new species of Elaphoglossum Schott ex J. Sm. (Dryopteridaceae) from Costa Rica
(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 NEMATODE, SCLERORHABDITIS NEOTROPICALIS SP.N. (RHABDITIDA), ASSOCIATED WITH AZTECA ANTS IN CECROPIA OBTUSIFOLIA
(Nematropica, 2012-06)Sclerorhabditis neotropicalis sp. n. is described and illustrated. It can be distinguished by its body length (515-560 μm in females and 363-455 μm in males), lip region with crown-shaped lips, having acute three acute ... -
A new species of Seticeros from Costa Rica (Coleoptera, Cerambycidae, Prioninae)
(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 Sulfur and Carbon Degassing Inventory for the Southern Central American Volcanic Arc: The Importance of Accurate Time-Series Data Sets and Possible Tectonic Processes Responsible for Temporal Variations in Arc-Scale Volatile Emissions
(AGU Publications, 2017-12-12)This work presents a new database of SO2 and CO2 fluxes from the Southern Central American Volcanic Arc (SCAVA) for the period 2015–2016. We report 300 SO2 flux measurements from 10 volcanoes and gas ratios from 11 volcanoes ... -
A new vanilla species from Costa Rica closely related to V. planifolia (Orchidaceae)
(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 Salmonella Typhimurium causes renal disease in olive ridley turtles (Lepidochelys olivacea) in the Pacific
(Springer Nature, 2019-06-27)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 novel host-adapted strain of SalmonellaTyphimurium causes renal disease in olive ridley turtles (Lepidochelys olivacea) in the Pacifc
(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 ojo de un mal cubero
(La República, 2019-05-28)Las noticias eran ya bastante grises y el panorama de crecimiento, desempleo, pobreza y exclusión social de este 2019 nos mostraban un panorama desalentador. Sin embargo, como buen tecnócrata y fiel a su trayectoria liberal ... -
A participatory assessment of ecosystem services and human wellbeing in Rural Costa Rica using Photo-Voice
(Springer, 2012-03-09)Human well-being is intricately connected to ecosystem services. A keystone contribution to the ecosystem service literature has been the Millennium Ecosystem Assessment, MA, (Ecosystems and human well-being: a framework ...