• Asymptotic expansion of the invariant measure for ballistic random walk in the low disorder regime 

  Campos Fernández, José David; Ramírez Chuaqui, Alejandro Francisco (2015)

  We consider a random walk in random environment in the low disorder regime on Zd. That is, the probability that the random walk jumps from a site x to a nearest neighboring site x+e is given by p(e)+ǫξ(x,e), where p(e) is ...

• Does Estuary Restoration Design Alter the Fine Scale Movements of Gray Smoothhounds (Mustelus californicus) in Southern California? 

  Freedman, Ryan; Espinoza Mendiola, Mario; Voss, Kelley M.; Farrugia, Thomas; Whitcraft, Christine R.; Lowe, Christopher G. (2017)

  Restored estuaries in southern California are limited in size and shape by fragmentation from human development, which can in turn restrict habitat use. Thus, it is important to assess how habitat design affects how fish ...

• Discovery of nicoyamycin A, an inhibitor of uropathogenic Escherichia coli growth in low iron environments 

  Mike, Laura A.; Tripathi, Ashootosh; Blankenship, Connor M.; Saluk, Alyssa; Schultz, Pamela J.; Tamayo Castillo, Giselle; Sherman, David H.; Mobley, Harry L. T. (2017)

  High-throughput screening and activity-guided purification identified nicoyamycin A, a natural product comprised of an uncommon 3-methyl-1,4-dioxane ring incorporated into a desferrioxamine-like backbone via a spiroaminal ...

• Genetic diversity and reproductive biology of the dioecious and epiphytic bromeliad Aechmea mariae-reginae (Bromeliaceae) in Costa Rica: implications for its conservation 

  Cascante Marín, Alfredo; Trejos Hernández, Christian; Madrigal Brenes, Ruth; Fuchs Castillo, Eric J. (2019)

  Ecological traits and pollination mode associated with dioecious sexual expression in plants are likely to influence their reproductive success and levels of genetic diversity. Dioecy is an uncommon condition in Bromeliaceae. ...

• Stem and crown allometry in four congeneric species of dioecious tropical trees 

  Fernández Otárola, Mauricio; Sazima, Marlies; Solferini, Vera Nisaka (2016)

  Morphological adaptations favor differential use of the space in tropical trees, but the variability in stem and crown allometry can be constrained by phylogenetic and mechanical factors. In addition, dioecious species ...

• Ecological Networks between Tent-Roosting Bats (Phyllostomidae: Stenodermatinae) and the Plants Used in a Neotropical Rainforest 

  Rodríguez Herrera, Bernal; Rodríguez Girón, Melissa E.; Fernández Otárola, Mauricio (2018)

  Roost ecology in bats is a complex interaction of behavioral, morphological and physiological adaptations, thus, there are many factors involved in roost selection by bat species. Approximately 22 species of bats are able ...

• Nest initiation by multiple females in an aerial-nesting orchid bee, Euglossa cybelia (Apidae: Euglossini) 

  Solano Brenes, Diego; Fernández Otárola, Mauricio; Hanson Snortun, Paul (2018)

  Among orchid bees that have been observed, nest initiation by multiple females is rare, and has never been reported from an aerial-nesting species. Here, we document nest initiation by multiple females in the aerial-nesting ...

• Diversity and composition of tropical forest plant communities in the Golfo Dulce region 

  Hofhansl, Florian; Chacón Madrigal, Eduardo; Morera Beita, Albert; Silla Cortés, Fernando; Huber, Werner; Weissenhofer, Anton; Wanek, Wolfgang (2019)

  The Golfo Dulce region located in southwestern Costa Rica represents one of the remnant global biodiversity hotspots containing the largest Pacific lowland tropical forest in Central America. Recent biogeographical analyses ...

• Esquemas en grupos y torsores 

  Esquivel Araya, Jorge Arturo (2019)

  El principal objetivo es analizar la extensión de un G-torsor dado sobre la fibra genérica de X, donde X=AnRes el espacio afín n-dimensional sobre un anillo de valuación discreta R. Para ello primero se estudiará ...

• Relation between Luminescence and Electronic Surface Characteristics in p-type Porous Silicon 

  Weisz, S. Z.; Ramírez Porras, Arturo; Gómez, Manuel; Many, A.; Goldstein, Yehuda; Savir, Esther (1997)

  Measurements of photoluminescence, electronic surface states and effective surface area, at various stages of the anodization process, are presented. The results show a behavior different from that observed on n-type porous Si.

• Phototransport Properties of a-SiC:H Alloys 

  Balberg, I.; Nery, Guillermo; Ramírez Porras, Arturo; Resto, O.; Weisz, S. Z.; Lubianiker, Y. (1995)

  We report a study of the mobility-lifetime products of the two charge carriers in a-SiC:H alloys. The measurements were carried out as a function of the carbon concentration and the temperature. An analysis, relying on the ...

• Vacuum treatment to stabilize oxidation at low temperature region in porous silicon 

  Allen, Kevin; Pereira Cubillo, Juan Sebastián; Ramírez Porras, Arturo (2020)

  Oxidation in porous silicon is studied for as-etched samples and samples subjected to high vacuum at room temperature. Attenuated Total Reflectance (ATR) measurements in infrared spectroscopy for temperatures ranging from ...

• Simulated overfishing and natural eutrophication promote the relative success of a non-indigenous ascidian in coral reefs at the Pacific coast of Costa Rica 

  Roth, Florian; Stuhldreier, Ines; Sánchez Noguera, Celeste; Carvalho, Susana; Wild, Christian (2017)

  Colonial ascidians of the genus Didemnum are common fouling organisms and are typically associated with degraded ecosystems and anthropogenic structures installed in the sea. In this study, however, the non-indigenous ...

• Influencia de los principales modos anulares hemisféricos y El Niño-Oscilación del Sur (ENOS) en las fuentes de humedad globales de Mesoamérica 

  Castillo Rodríguez, Rodrigo; Nieto, Raquel; Gimeno, Luis (2019)

  Se estudió la influencia de las oscilaciones atmosféricas interanuales de gran escala en la captación y el transporte de humedad proveniente de las principales fuentes oceánicas con impacto en Mesoamérica utilizando el ...

• Macroinvertebrates as indicators in tropical streams with different land use in southern Costa Rica 

  Duschek, Verena G.; Springer Springer, Monika; Niedrist, Georg H.; Füreder, Leopold (2019)

  Costa Rica is one of the countries with the highest species richness worldwide and forms an important land bridge between North and South America. In the past, Costa Rica suffered from deforestation due to conversion of ...

• Pressure dependence of ferroelectric quantum critical fluctuation 

  Coak, Matthew J.; Haines, Charles Robert Sebastian; Liu, Cheng; Guzmán Verri, Gian Giacomo; Saxena, Siddharth S. (2019-12-13)

  Phase transitions to a long-range-ordered state driven by a softened phonon mode are ubiquitous across condensed matter physics, but the evolution of such a mode as the system is tuned to or from the transition has never ...

• Estimacion de caudales ambientales utilizando macroinvertebrados acuáticos: una propuesta metodológica 

  Quesada Alvarado, Francisco (2020)

  Para evitar las afectaciones que se producen por la disminución del caudal debido a las actividades humanas, se ha implementado el caudal ambiental, el cual cuenta con diversas metodologías para determinarlo. La simulación ...

• Procesos de Levy Cilíndricos: Regularización e Integración 

  Alvarado Solano, Anddy Enrique (2020)

  Para la presentación de los resultados de plantea una estructura de una tesis compuesta de 4 capítulos. Dichos capítulos están descritos acontinuación. En el Capítulo 1 se presentan algunos preliminares necesarios para ...

• Implementación de una plataforma computacional para la solución de PDE's elípticas, mediante FEM y descomposición de dominios BDDC. 

  Mora Cordero, Fabian (2019)

  En este trabajo se desarrolla una plataforma computacional en C++-CUDA, la cual introduce una serie de estructuras de datos que simplifican el manejo de memoria en CUDA. En la plataforma también se introducen elementos de ...

• Análisis de riesgo en los tanques estacionarios de gas licuado de petróleo en la ciudad universitaria Rodrigo Facio 

  Mora Vargas, Guido (2019)

  El presente trabajo final de investigación aplicada (TFIA) ha sido concebido bajo la premisa de colaborar con el Programa de Gestión del Riesgo y Reducción de Desastres de la Universidad de Costa Rica (PGRRD-UCR), el ...

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