Browsing Articulos, Pre-prints (Facultad de Ciencias) by Title
Now showing items 65-84 of 488
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Comment on Ricci Collineations of static spherically symmetric spacetimes
(SABER ULA, 2006-01-26)Comment on Ricci Collineations of static spherically symmetric spacetimes (Núñez, Luis; Contreras, Gerardo; Percoco, Umberto; Bertolotti, Ricardo; Carot, J.) Abstract We present a counter example to a theorem given ... -
Community impacts of Prosopis juliflora Iivasion: biogeographic and congeneric comparisons
(Plos ONE 7(9):e44966. 1-13, Venezuela, 2012-09-12)We coordinated biogeographical comparisons of the impacts of an exotic invasive tree in its native and non-native ranges with a congeneric comparison in the non-native range. Prosopis juliflora is taxonomically complicated ... -
Comparative ecophysiology and anatomy of a terrestrial and epiphytic anthurium bredemeyeri cchott in a tropical Andean cloud forest
(Journal of Experimental Botany 43:723-727, Venezuela, 1992-05) -
Comparative phylogeography of Trypanosoma rangeli and Rhodnius (Hemiptera: Reduviidae) supports a long coexistence of parasite lineages and their sympatric vectors
(Molecular Ecology (2007) 16, 2007)To make reliable interpretations about evolutionary relationships between Trypanosoma rangeli lineages and their insect vectors (triatomine bugs of the genus Rhodnius ) and, thus, about the determinant factors of lineage ... -
Comportamiento ecofisiológico de Brachiaria decumbens en monocultivo en asociación con Leucaena leucocephala
(Pastos y Forrajes 31(3): 217-227, Cuba, 2008-09)Con el objeto de estudiar las relaciones ecofisiológicas que determinan el crecimiento de B. decumbens en monocultivo (MO) y asociada a L. leucocephala (AS), se realizaron evaluaciones de radiación fotosintéticamente activa ... -
La composición de las sabanas en Barinas en relación con las unidades edáficas
(Acta Científica Venezolana 27: 68-78., Venezuela, 1976) -
Conformal symmetries in null Einstein-Maxwell fields
(SABER ULA, 2008-07-02)Conformal symmetries in null Einstein-Maxwell fields (Carot, Jaume; Hall, J. S.) Abstract It is shown that if a null Einstein-Maxwell spacetime admifs a proper conformal vector field it must either be a (generalized ... -
Conformal symmetries in warped manifolds.
(SABER ULA, 2008-07-02)Conformal symmetries in warped manifolds (P. S., Apostolopoulos; Carot, Jaume.) Abstract The existence of a Conformal Vector Field (CVF) is studied in the important class of warped manifolds of arbitrary dimension ... -
Conformal symmetry inheritance in null fluid spacetimes
(SABER ULA, 2008-07-02)Conformal symmetry inheritance in null fluid spacetimes (Carot, Jaume; Keane, A. J.; Coley, A. A.; Hall, J. S.; Tupper, Brian O. J.) Abstract We define inheriting conformal Killing vectors for null fluid spacetimes ... -
Conformally reducible 2 + 2 spacetimes
(SABER ULA, 2008-07-02)Conformally reducible 2 + 2 spacetimes (Carot, Jaume; Tupper, Brian O. J.) Abstract Spacetimes which are conformal to 2 + 2 reducible spacetimes are considered. We classify them according to their conformal algebra, ... -
Cosmos y cosmología
(SABER ULA, 2003-07-14)La traducción de este artículo fue publicada en el libro: Astrobiology: Origins from Big bang to Civilisation, Editado por Julián Chela-Flores, Guillermo A. Lemarchand y John Oró, Klwer Academis Press, 2000. -
Coupling soil water and shoot dynamics in three grass species: A spatial stochastic model on water competition in Neotropical savanna
(Ecological Modelling 220: 2734 - 2743, Países Bajos, 2009-10-24)Savannas are ecosystems known for their high environmental and economic value. They cover at least 20% of the global land surface and, in some cases, can act as a boundary between tropical rainforest and deserts.Water is ... -
Covariant duality symmetric actions
(SABER ULA, 2005-01-06)Covariant duality symmetric actions (Khoudeir, Adel; Pantoja, Nelson) Abstract A manifestly Lorentz and diffeomorphism invariant form for the abelian gauge field action with local duality symmetry of Schwarz and ... -
¿Cómo responde la especie leñosa Vaccinum Meridionale a la temperatura en su límite altitudinal de distribución en Los Andes tropicales?
(SABER-ULA, Venezuela, 2011-06)La ocurrencia del límite arbóreo es un fenómeno global que implica un cambio en la dominancia de formas de vida. La importancia de la temperatura como determinante de este límite ecológico ha sido reconocida, pero hasta ... -
Cracking of self-gravitating compact objects with local and non local equations of state.
(SABER ULA, 2006-12-28)Cracking of self-gravitating compact objects with local and non local equations of state. (Abreu, Henso; Hernández, Hector y Núñez, Luis) Abstract We discuss the effect that small fluctuations of density and local ... -
Crecimiento y desarrollo en plantas juveniles de apamate (Tabebuia rosea (Bertol.) A. DC.) sometidas a inundación
(2010)Se describen las principales respuestas morfológicas y fisiológicas en plantas juveniles de apamate (Tabebuia rosea (Bertol.) A. DC.) sometidas a estrés hídrico por inundación, bajo condiciones de invernadero. Se utilizó ...