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Now showing items 48-67 of 13018
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A first estimation of tsunami hazard of the Pacific coast of Costa Rica from local and distant seismogenic sources
(Springer, 2021-06-04)Costa Rica has been affected by several local and distant tsunamis in the past, but the historical information is scarce and incomplete. Its Pacific coast stretches for over a thousand kilometers, and tsunami hazard has ... -
A joint Myxoma in a dog
(Harcourt Publishers Ltd, 2001)Myxomas of the joints are extremely rare in domestic animals, only four cases, all in dogs, having been reported previously. This paper describes a myxoma originating from the synovium of the right radiocarpal joint of ... -
A Justice to Come: The Politics of Reading
(Universidad Nacional (Costa Rica).Escuela Ecuménica de Ciencias de la Religión, 2018) -
A la deriva
(La República, 2019-07-02)Es el nombre de mi ultimo libro que resume las columnas y escritos de este último quinquenio. Se trata de un repaso de la realidad social, económica y política del país, en medio de una creciente incapacidad para tomar ... -
A la deriva: Reflexiones sobre la realidad nacional e internacional
(Centro Internacional de Política Económica para el Desarrollo Sostenible, 2017)"A la deriva” es una forma de exponer la realidad costarricense de nuestro tiempo. Si bien es cierta la expresión a la deriva da cuenta de una clásica expresión marítima, asociada con una nave que ha perdido el control o ... -
A lightweight environment for 2D visual applications
(EasyChair, 2019)People and organizations constantly use a wide variety of devices and formats to produce large volumes of data. This involves a series of challenges related to processing and transforming data into valuable knowledge to ... -
A long-term record of polythionates in the acid crater-lake of Poás volcano: Changes in the subaqueous input of fumarolic gases
(IAVCEI. General Assembly. Pucón-Chile, 2004-01) -
A management plan for the sport fishery of Parachromis dovii (Pisces: Cichlidae) in Hule lake, Costa Rica
(Universidad de Costa Rica, 2000-06)A first attempt to regulate the fishing activity while preserving the species and its habitats is presented for Hule lake. We intensively sampled the "guapote" between March 1996 and April 1997 using monofilament gill nets ... -
A methane sink in the Central American high elevation páramo: Topographic, soil moisture and vegetation effects
(Elsevier B.V., 2020-03-15)Methane (CH4) is a strong greenhouse gas with a global warming potential 23 times larger than that of carbon dioxide. Characterizing ecosystems as either sources or sinks for methane and their magnitudes informs on biosphere ... -
A method to obtain rapid zoosporogenesis of Pythium insidiosum
(Kluwer Academic Publishers, 1988-10)Nine strains of Pythium insidiosum the etiologic agent of pythiosis, were inoculated on 2% water agar plus grass blades and then incubated one day at 25°C, 35°C and 37°C. Sporangium and secondary biflagellate-type zoosporas ... -
A methodological proposal to improve the descriptive paragraph writing skills of eleventh grade students from Colegio Ambientalista Isaías Retana Arias in Pérez Zéledón
(Universidad Nacional, Costa Rica, 2010)Esta investigación se realizó en el Colegio Ambientalista Isaias Retana Arias en Pérez Zeledón. Esta es una institución pública y se construyó en el año 2000. El proyecto trata sobre la mejora de las habilidades de escritura ... -
A Microscopic Model for a One Parameter Class of Fractional Laplacians with Dirichlet Boundary Conditions
(Springer Science and Business Media Deutschland GmbH, 2021)We prove the hydrodynamic limit for the symmetric exclusion process with long jumps given by a mean zero probability transition rate with infinite variance and in contact with infinitely many reservoirs with density α ... -
A mixed virtual element method for a pseudostress-based formulation of linear elasticity
(Elsevier B.V., 2019)In this paper we introduce and analyze a mixed virtual element method (mixed-VEM) for a pseudostress-displacement formulation of the linear elasticity problem with non homogeneous Dirichlet boundary conditions. We follow ... -
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 ...