Parcourir Unidades de Investigación de la Facultad de Ciencias par titre
Voici les éléments 984-1003 de 1111
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Savanna Biodiversity and Ecosystem Properties
(Biodiversity and savanna ecosystem processes: a global perspective, Alemania, 1996) -
Scalar field cosmologies: a dynamical systems study
(SABER ULA, 2008-07-02)Scalar field cosmologies: a dynamical systems study (Carot, Jaume; Collinge, Magdalena M.) Abstract Inhomogeneous G2 solutions whose material content can be modelled by a scalar field are considered with a view towards ... -
Scalar field spacetimes
(SABER ULA, 2008-07-02)Scalar field spacetimes (Carot, Jaume; Collinge, Magdalena M.) Abstract Scalar field spacetimes are considered with a view towards their applications in cosmology. Some results existing in the literature are reviewed ... -
¿Se regenera bosque tropical seco en la Península de Guanahacabibes (Cuba)? Análisis del proceso de reconversión a través de la caracterización de las etapas sucesionales con un enfoque ecológico del paisaje.
(Venezuela, 2011-10)El bosque tropical seco (BTS) constituye el ecosistema que más ha experimentado el proceso de conversión; entre 1950 y 1990 su extensión disminuyó un 14%, actualmente ocupa el 42% de la cobertura boscosa mundial. En la ... -
Seasonal gas exchange and water relations in juveniles of two evergreen neotropical savanna tree species with contrasting regeneration strategies
(Trees 25(3): 473-483, Venezuela, 2011)Colonization dynamics of woody species into grasslands in Neotropical savannas are determined by two main factors: plant-available moisture and fire. Considering seasonality of precipitation and high fire frequency in these ... -
Seasonal variations in leaf gas exchange of platain cv. Hartón (Musa AAB) under different soil water conditions in a himid tropical region
(2005)The seasonal effect of soil water availability on leaf gas exchange of plantain plants cv. Hartón growing on two different texture soils (loamy and clayey) were evaluated. Soil water deficits corresponded to 48, 24 and 4 ... -
See-saw and supersymmetry or exact R-parity
(SABER ULA, 2005-01-06)See-saw and supersymmetry or exact R-parity (Melfo, Alejandra; Aulakh, Charanjit S.; Rasin, Andrija; Senjanovic, Goran) Abstract We show how the renormalizable see-saw mechanism in the context of supersymmetry and ... -
Seed dispersal in Palicourea rigida H.B.K, a common treelet species from neotropical savannas
(2001)The dispersal system of Palicourea rigida (Rubiaceae), a common woody species of neotropical savannas, was studied in a seasonal Venezuelan savanna. Production and consumption of fruits, dispersal agents, feeding ... -
Seed dispersal in Palicourea rigida, a common treelet species from neotropical savannas
(SABER ULA, 2005-01-26)Seed dispersal in Palicourea rigida, a common treelet species from neotropical savannas (Wütherich, Dirk † ; Azócar, Aura; García, Nuñez, Carlos and Silva, Juan F. ) Abstract The dispersal system of Palicourea ... -
Seed production and soil seed bank in three evergreen woody species from a neotropical savanna
(SABER ULA, 2001)Seed production and soil seed bank in three evergreen woody species from a neotropical savanna (Azócar, Aura; García, Nuñez, Carlos and Silva, Juan F. ) Abstract Results of a 3-y study on the populations of three ... -
Self-dual spin-3 and 4 theories
(SABER ULA, 2005-01-06)Self-dual spin-3 and 4 theories (Khoudeir, Adel; Aragone, Carlos) Abstract We present self-dual spin-3 and 4 actions using relevant dreibein fields. Since these actions start with a Chern-Simons like kinetic term ... -
Self-gravitating domain walls and the thin-wall limit
(SABER ULA, 2005-05-25)Self-gravitating domain walls and the thin-wall limit Guerrero, Rommel, Melfo, Alejandra; Pantoja, Nelson Abstract We analyse the distributional thin wall limit of self gravitating scalar ... -
Self-similar static solutions admitting a 2-space of constant curvature
(SABER ULA, 2008-07-02)Self-similar static solutions admitting a 2-space of constant curvature (Carot, Jaume; Sintes, A. M.) Abstract A recent result by Haggag and Hajj-Boutros is reviewed within the framework of self-similar spacetimes, ... -
Selvas y bosques de montaña
(Venezuela, 2003) -
Selvas y bosques nublados de Venezuela
(Medina, E., Huber, O., Nassar, J., Navarro, P. Recorriendo el paisaje vegetal en Venezuela. Ediciones IVIC, Instituto Venezolano de Investigaciones Científicas. Caracas, Venezuela. pp. 125-155, Venezuela, 2013) -
Semilla, actores e incertidumbres en la producción papera de Los Andes de Mérida. Realidades y escenarios bajo el contexto político vigente.
(SABER ULA, 2005-11-14)El presente trabajo presenta una visión de síntesis sobre los actores sociales involucrados en la problemática de la producción-importación de la semilla de papa. Se argumenta que estos actores institucionales y sociales ... -
Sensitivity of soil restoration indicators during paramo succession in the high tropical Andes: chronosequence and permanent plot approaches
(Restoration Ecology 17(5): 619-628, Venezuela, 2009-09)The aim of this study was to analyze indicators of soil restoration during secondary succession in a heterogeneous valley in the high tropical Andes. A combination of chronosequence and permanent plot methods was used to ... -
Shrubs as foundation species in a high tropical alpine ecosystem: a multi-scale analysis of plant spatial interactions
(Plant Ecology and Diversity, 2014-09)Background: Studies on plant–plant interactions in alpine ecosystems show a strong bias for temperate vs. tropical latitudes and pay limited attention to the implications of biophysical heterogeneity beyond the local plant ...