Listar Ciencias básicas por título
Mostrando ítems 1494-1513 de 3100
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High and low affinity sites of ferrihydrite for metal ion adsorption: Data and modeling of the alkaline-earth ions Be, Mg, Ca, Sr, Ba, and Ra
(2020-10-01)The alkaline-earth metal ion series comprises Be, Mg, Ca, Sr, Ba, and Ra. Calcium (Ca) and magnesium (Mg) are the most abundant alkaline-earth metal ions in nature and their interaction with the mineral surfaces of metal ... -
High Performance Graphene–Oxide–Metal Diode through Bias‐Induced Barrier Height Modulation
(2016)Graphene–oxide–metal diodes are presented whose performance is preserved even for thin oxide layers, as required for high frequency applications. The diodes, which rely upon bias-induced modulation of graphene's work ... -
Highly diverse fungal communities in carbon-rich aquifers of two contrasting lakes in Northeast Germany
(2019-10)Fungi are an important component of microbial communities and are well known for their ability to decompose refractory, highly polymeric organic matter. In soils and aquatic systems, fungi play an important role in carbon ... -
La Historia de la Física en Costa Rica: Ing. Henry Mcghie Boyd
(Ciencia y Tecnología, v. 18, n. 1-2, p. 9-19, 1994, 1994)En el desarrollo de la física y matemática en la Universidad de Costa Rica (UCR), la figura del Ing. Henry McGhie Boyd destaca por sus méritos y trayectoria. Henry McGhie, nació en San José, el 27 de mayo de 1908. En el ... -
Historia del desarrollo de las Ciencias Atmosféricas en la Universidad de Costa Rica: hasta 1995
(Ciencia y Tecnología 18 No.1,2(1994) 31-46, 1994)Se describe el desarrollo histórico de las Ciencias Atmosféricas en la Universidad de Costa Rica, desde que se empezó a impartir la carrera de Meteorología en 1968 hasta 1995. Los antecedentes de la creación de dicha carrera ... -
Historia natural y repertorio acústico del Sancuinclas (Pezopetes capitalis), ave endémica de Costa Rica y el oeste de Panamá
(2014)El Sancuinclas es una especie endémica y un habi- tante común del sotobosque de bosques montanos y páramo en las tierras altas de Costa Rica y el oeste de Panamá. A pesar de ser una especie común, existía poca información ... -
Historical daily precipitation patterns for Central America generated using constructed analogues from satellite and ground- based observations
(2011-03)The constructed analogues (CA) method was applied to downscale daily precipitation patterns from a 0.5° x 0.5° to a 0.25° x 0.25° spatial resolution for the period of 1958 to 1997 for the Central American region. The ... -
Un híbrido espontáneo entre Aristolochia gorgona y A. grandiflora (Aristolochiaceae)
(2005)A spontaneous hybrid between Aristolochia gorgona and A. grandiflora appeared at Lankester Botanical Garden, Costa Rica, where plants of both species were cultivated in close proximity. This indicates that geographic ... -
Híbridos silvestres de patos (Anseriformes: Anatidae) registrados en Costa Rica
(2016-09)Informamos la existencia de tres híbridos silvestres de patos en Costa Rica, basados en observaciones esporádicas en el país. Adicionalmente, proveemos una explicación de cuáles, serían las especies que dieron origen a ... -
Homoplasious colony morphology and mito-nuclear phylogenetic discordance among Eastern Pacific octocorals
(2016)Octocorals are a diverse and ecologically important group of cnidarians. However, the phylogenetic relationships of many octocoral groups are not well understood and are based mostly on mitochondrial sequence data. In ... -
Homopropargyl alcohol 1,1-diphenylbut-3-yn-1-ol
(2018)The asymmetric unit of the title compound, C16H14O, contains one molecule with a central carbon atom having a distorted tetrahedral geometry made of a propargylic fragment, a hydroxy group and two aromatic rings. ... -
Homopropargyl alcohol 5,5-diphenylpent-2-yne-1,5-diol
(2018)In the title compound, C17H16O2, the central carbon atom has a distorted tetrahedral geometry [spread of angles = 105.71 (8)–112.75 (9)°] for its bonds to a homopropargylic but-2-yn-1-ol moiety, a hydroxy group and two ... -
Hopf algebras in noncommutative geometry
(2003)We give an introductory survey to the use of Hopf algebras in several problems of noncommutative geometry. The main example, the Hopf algebra of rooted trees, is a graded, connected Hopf algebra arising from a universal ... -
Horichia dressleri. A new genus recorded for Costa Rica and a truly rare orchid?
(2017)Orchid collectors, as well as scientists, know that some species are rarer than others. “Know” should perhaps be used in this context with some caution as, in general, rarity is something closer to a perception than ... -
Horichia Jenny
(2022)Rarity, in orchids, is often closer to a perception than to a specific category of frequency, assessed on the basis of documented data. Rare species are frequently only a way to say that they are rarely seen in living ... -
Hot carrier extraction from multilayer graphene
(2016)Hot carriers in semiconductor or metal nanostructures are relevant, for instance, to enhance the activity of oxide-supported metal catalysts or to achieve efficient photodetection using ultrathin semiconductor layers. ... -
House Wrens Troglodytes aedon reduce repertoire size and change song element frequencies in response to anthropogenic noise
(2020-06-09)Anthropogenic noise (≤ 3 kHz) can affect key features of birds’ acoustic communication via two different processes: (1) song-learning, because songbirds need to hear themselves and other birds to crystallize their song, ... -
How many species of Pleurothallidinae are there?
(2019)Subtribe Pleurothallidinae is possibly the most species-rich of all orchid groups. Nevertheless, they are a young group of plants in terms of scientific learning. The last three decades have been the most active with respect ...