Listar Ciencias básicas por título
Mostrando ítems 2040-2059 de 3121
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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 standard form of the Bloch equation
(1979-03)The requirement is often made in non-equilibrium statistical mechanics that a transport equation should be derived as that which governs the subdynamics relative to a (small) part of a (large) conservative dynamical ... -
On the status of the genus Hybochilus, with a new combination in Leochilus (Orchidaceae: Oncidiinae)
(2021)The name Rodriguezia inconspicua, proposed as a replacement name for Trichocentrum candidum, is a homotypic synonym of the latter, as well as the new combinations based on the same name. The genus Hybochilus, typified by ... -
On the supremum of a family of set functions
(2023)The concept of supremum of a family of set functions was introduced by M. Veraar and I. Yaroslavtsev (2016) for families of measures defined on a measurable space. We expand this concept to include families of set functions ... -
On the types of Maxillaria grandiflora and Heterotaxis valenzuelana (Orchidaceae: Maxillariinae)
(2011-12)The type specimen of Maxillaria grandiflora (Kunth) Lindl. was collected by Alexander von Humboldt and Aimé Bonpland during their scientific expedition to Tropical America. Its type locality, which has been the subject of ... -
On the ultraviolet behaviour of quantum fields over noncommutative manifolds
(1999-03)By exploiting the relation between Fredholm modules and the Segal-Shale-Stinespring version of canonical quantization, and taking as starting point the first-quantized fields described by Connes' axioms for noncommutative ... -
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 ... -
On twin peak quasi-periodic oscillations resulting from the interaction between discoseismic modes and turbulence in accretion discs around black holes
(2020)Given the peculiar and (in spite of many efforts) unexplained quasi-periodic oscillation (QPO) twin peak phenomena in accretion disc psd observations, the present exploratory analytical article tries to inquire deeper ... -
Oncidium Sw. [with a new species, Oncidium coquianum]
(2022-02)Costa Rican species of Oncidium are presented and discussed. A new species, Oncidium coquianum Pupulin & Dalström, is described and illustrated. -
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 ... -
One-Pot Conversion of Aldehydes and Ketones into 1-Substituted and 1,4-Disubstituted 1,3-Enynes
(2018)Sequential treatment of 2,3-dichloropropene with magnesium and n-BuLi generates the operational equivalent of 1,3-dilithiopropyne, which upon treatment with aldehydes or ketones, produces the corresponding alkoxy lithium ... -
Online Education Program in Operational Meteorology and a Case Study about a Product for Decision Making
(2020)An online program developed at the University of Costa Rica provides the professionals working in meteorology a new way to pursue graduate level degrees. The focus of this graduate program is Operational Meteorology and ... -
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 ... -
Ontogeny repeats phylogeny in Steatoda and Latrodectus spiders
(2010)Web designs of young spiders are often less derived than those of older conspecific individuals. This study tested whether this ‘‘ontogeny repeats phylogeny’’ pattern occurs in two species of Latrodectus and two species ... -
OpenDose: Open access resources for nuclear medicine dosimetry
(2020)Radiopharmaceutical dosimetry depends on the localization in space and time of radioactive sources and requires the estimation of the amount of energy emitted by the sources deposited within targets. In particular, when ... -
Operando tracking of oxidation-state changes by coupling electrochemistry with time-resolved X-ray absorption spectroscopy demonstrated for water oxidation by a cobalt-based catalysts film
(2021)Transition metal oxides are promising electrocatalysts for water oxidation, i.e., the oxygen evolution reaction (OER), which is critical in electrochemical production of non-fossil fuels. The involvement of oxidation state ... -
Optical component
(2010-02-15)El invento trata de un componente óptico, que comprende un primer reflector esférico y un segundo reflector esférico, el cual está colocado para reflejar un rayo de luz varias veces entre el primer reflector y el segundo ...