Browsing Ciencias básicas by Title
Now showing items 1078-1097 of 1562
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Observaciones meteorológicas en la región Caribe de Costa Rica (1833-1949)
(2017)El presente artículo sintetiza los principales procesos histórico-científicos que permitieron el desarrollo de las primeras observaciones meteorológicas elaboradas en la región caribeña de Costa Rica. Se parte de las ... -
Observations on the breeding behaviour of Snowy Cotinga
(2016)Tres nidos de la Cotinga Nivosa Carpodectes nitidus muestran un diseño muy simple, que consiste en una plataforma construida de ramitas y zarcillos, similar al descrito previamente para esta especie y para otras cotingas. ... -
Observations on the ultrastructure and hydrophobicity of the wings of thirteen Neotropical families of diptera (insecta) with comments on their flight
(2015-11)Insects' wings are complex surfaces that have become a new field to study towards the design of flying devices and hydrophobic surfaces. Several orders and families of insects have been analyzed for their hydrophobic ... -
Observed (1970-1999) climate variability in Central America using a high-resolution meteorological dataset with potential for climate change studies
(2015-10)Average temperature (Tavg) data from stations and station-based gridded datasets at 50 km resolution were used to provide a high-resolution (5 km grid) dataset for Central America from 1970 to 1999. The procedure used ... -
Observed (1970–1999) climate variability in Central America using a high-resolution meteorological dataset with implication to climate change studies
(2016)High spatial resolution of precipitation (P) and average air temperature (Tavg) datasets are ideal for determining the spatial patterns associated with large-scale atmospheric and oceanic indexes, and climate change and ... -
Observed Changes (1970-1999) in Extreme Hydroclimatic Events in Central America
(2018-04-20)Previous studies have shown that most of Central America has been experiencing warming trends during the last 30-50 years, while precipitation annual totals have not changed much. Warming alone can exacerbate the effects ... -
Obstáculos y oportunidades para el “progreso”. Las representaciones de la naturaleza costarricense como “recurso natural” y los condicionantes de su apropiación y aprovechamiento: el caso de los exploradores extranjeros (1850-1905)
(Buenos Aires: Editorial FEPAI, 2007, 2007)Los estudios históricos de la naturaleza y su relación con las sociedades son esfuerzos que permiten explicar la situación del presente en relación con el manejo de los recursos naturales. En este estudio se analiza una ... -
Obtención de conjuntos aproximados mediante algoritmos genéticos
(Tesis para optar al grado de Magister Scientiae en Computación. ITCR, Cartago, 1999., 1999)En términos generales, la teoría de conjuntos aproximados, propuesta por Pawlak, consiste en explorar las particiones asociadas a las relaciones de equivalencia generadas por cada subconjunto de los atributos observados, ... -
Occurrence of the tripodfish Bathypterois ventralis (Aulopiformes: Ipnopidae) in the Pacific coast of Costa Rica
(2015-05)Between 1990 and 1992, 2 adult specimens of the ventrad spiderfish, Bathypterois ventralis Garman 1899, were collected at depths between 637 and 880 m off the Pacific coast of Costa Rica. These specimens constitute the ... -
Oceanic and terrestrial sources of continental precipitation
(American Geophysical Union 50:1-41, 2012-11-08)The most important sources of atmospheric moisture at the global scale are herein identified, both oceanic and terrestrial, and a characterization is made of how continental regions are influenced by water from different ... -
Ocurrencia de ciclones tropicales en el Mar Caribe y sus impactos sobre Centroamérica
(2010-01)Se definieron en este trabajo los años de alto o bajo impacto en Costa Rica por el paso de Ciclones Tropicales en el Caribe para 1948-2007. Costa Rica posee una base rica en información sobre desastres naturales que afectaron ... -
On the approximation of a virtual coarse space for domain decomposition methods in two dimensions
(2018)A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ... -
On the Colmez conjecture for non-abelian CM fields
(2018-02-08)The Colmez conjecture relates the Faltings height of an abelian variety with complex multiplication by the ring of integers of a CM field E to logarithmic derivatives of Artin L-functions at s=0. In this paper, we prove ... -
On the one dimensional spectral Heat content for stable processes
(2016-09)This paper provides the second term in the small time asymptotic expansion of the spectral heat content of a rotationally invariant α-stable process, 0 < α ≤ 2, for the bounded interval (a, b). The small time behavior ... -
On the rainfall distribution with altitude over Costa Rica.
(Revista Geofísica 44, 57-72, 1996, 1996-01)Se estudia la distribución de la precipitación vertical en Costa Rica, a lo largo de un perfil topográfico que cruza el pais del Pacífico hasta la costa del mar Caribe. El perfil en montaña, cuyo pico más alto llega a los ... -
On the Ramanujan–Lodge harmonic number expansion
(2015-01-15)The aim of this paper is to extend and refine the Ramanujan–Lodge harmonic number expansion into negative powers of a triangular number. We construct a faster asymptotic series and some new sharp inequalities for the ... -
On the variability of the Caribbean lowlevel jet during winter: revisited
(Memorias de la European Geosciences Union General Assembly 2014, 2014-04)The Caribbean low-level jet (CLLJ) is a strong wind current over the Caribbean Sea. Annually it has two peak periods, where February and July being the winter and summer components, respectively. The CLLJ is an important ... -
One year weekly dynamics of limnological conditions and phytoplankton in Lake Bonilla, Costa Rica
(2016)The detailed response of tropical lake phytoplankton to weather variations has been little studied, but it seems that composition varies in response to rain and wind variability over the course of the year. In order to ... -
Ontogenetic changes in web architecture and growth rate of Tengella radiata(Araneae, Tengellidae)
(2008)In some spiders features of the webs of early instars may represent features of the ancestor's web. Some second instar spiderlings (first instar outside of the egg sac) of Tengella radiata (Kulczynski 1909) construct a ... -
Ontogeny of an interactive call-and-response system in Spix's disc-winged bats
(2020)We investigated the ontogenetic changes of two call types, the inquiry call and the response call, which comprise an interactive communication system in Spix's disc-winged bats, Thyroptera tricolor. We documented structural ...