Listar Articulos, Pre-prints (Facultad de Ciencias) por título
Mostrando ítems 388-407 de 488
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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 ... -
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 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) -
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 ... -
Síntesis y caracterización de los compuestos ternarios Cu2GeSe3 y Cu2GeTe3
(SABER ULA, 2008-03-27)Síntesis y caracterización de los compuestos ternarios Cu2GeSe3 y Cu2GeTe3 Villarreal, Manuel ; Fernández, B.J.; Pirela, María; Velásquez-Velásquez, Ana; Mora, Asiloé J.; Delgado, Gerzon Resumen En este trabajo se ... -
Síntesis y caracterización del material ternario Ag2SnSe3 dopado con galio.
(SABER ULA, 2008-03-27)Síntesis y caracterización del material ternario Ag2SnSe3 dopado con galio. Pirela B., María E.; Velásquez Velásquez, Ana; Villarreal, Manuel; Fernández, Braulio J.; Vivas, L. and Sánchez Pérez, Gerardo Resumen En este ... -
SO(10) theory of R-parity and neutrino mass
(SABER ULA, 2005-01-06)SO(10) theory of R-parity and neutrino mass (Melfo, Alejandra; Aulakh, Charanjit S.; Bajc, Borut; Rasin, Andrija; Senjanovic, Goran) Abstract We study the Higgs sector of a SO(10) grand unified theory which predicts ...