Listar Articulos, Pre-prints (Facultad de Ciencias) por título
Mostrando ítems 408-427 de 488
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Soluciones conformemente planas con ecuación de estado no local.
(SABER ULA, 2005-07-04)Soluciones conformemente planas con ecuación de estado no local. (Núñez, Luis; Muñoz S., A.G. .) Abstract A non-local equation of state describes the components of the energy-momentum tensor not only as a function of ... -
Some developments on axial symmetry
(SABER ULA, 2008-07-02)Some developments on axial symmetry (Carot, Jaume) Abstract The definition of axial symmetry in general relativity is reviewed, and some results concerning the geometry in a neighbourhood of the axis are derived. ... -
Sound speeds, cracking and stability of self-gravitating anisotropic compact objects.
(SABER ULA, 2007-06-25)Sound speeds, cracking and stability of self-gravitating anisotropic compact objects. Abstract Using the the concept of cracking we explore the influence of density fluctuations and local anisotropy have on the stability ... -
Spatial heterogeneity, land use and conservation in the cerrado region of Brazil
(2006)Aim This paper presents a spatial classification of the environmental and ecological diversity of the cerrado region of Brazil, as well as an appraisal of the levels of conversion to agriculture and of the extent of land ... -
Spatial relations and population structure of a dominant tree along a treeline ecotone in the Tropical Andes: interactions at gradient and plant-neighbourhood scales
(Plant Ecology and Diversity 6(3-4): 343-353, Venezuela, 2013)Background: Studies in temperate mountains suggest that plant-plant interactions modulate tree establishment above the forest line. In tropical mountains worldwide this issue remains largely unexplored. Aims: To analyse ... -
Spin waves at the ferromagnetic-antiferromagnetic interface
(SABER ULA, 2005-06-06)Spin waves at the ferromagnetic-antiferromagnetic interface Pestana, E., Mata, G. J., Pantoja, N. Abstract We investigate the magnon modes in the neighbourhood of the interface between a ... -
Static anisotropic solutions to Einstein equations with a nonlocal equation of state
(SABER ULA, 2005-04-18)Static anisotropic solutions to Einstein equations with a nonlocal equation of state (Núñez, Luis; Hernández, Hector) Abstract We present a general method to obtain static anisotropic spherically symmetric solutions, ... -
Structural refinement of the ternary chalcogenide compound Cu2GeTe3 by X-ray powder diffraction
(SABER ULA, 2007-03-28)Structural refinement of the ternary chalcogenide compoundCu2GeTe3 by X-ray powder diffraction Delgado, Gerzon E.; Mora, Asiloé J.; Pirela, María, Velásquez-Velásquez, Ana, Villarreal, Manuel; Fernández, Braulio ... -
Structure-Activity Relationship (SAR) studies of benzoxazinones, their degradation products, and analogues.
(SABER ULA, 2007-04-09)Structure-activity relationship (SAR) studies of benzoxazinones, their degradation products, and analogues. Phytotoxicity on problematic weeds Avena fatua L. and Lolium rigidum Gaud. (Macías, Francisco A.; Marín, David; ... -
Structure-Activity Relationship Studies of Benzoxazinones and Related Compounds. Phytotoxicity on Echinochloa crus-galli (L.) P. Beauv.
(SABER ULA, 2005-07-27)Structure-Activity Relationship Studies of Benzoxazinones and Related Compounds. Phytotoxicity on Echinochloa crus-galli (L.) P. Beauv (Macías, Francisco A.; Chinchilla, Nuria; Varela, Rosa M.; Oliveros, Alberto; Marín, ... -
Structure-Activity Relationships (SAR) studies of Benzoxazinones, their degradation products and analogues. Phytotoxicity on Standard Target Species (STS).
(SABER ULA, 2008-07-15)Structure-Activity Relationships (SAR) studies of Benzoxazinones, their degradation products and analogues. Phytotoxicity on Standard Target Species (STS) (Macías, Francisco A.; Marín, David; Oliveros, Alberto; Castellano, ... -
Supernovae: Where and why do they break off?
(SABER ULA, 2005-12-08)Supernovae: Where and why do they break off? (Herrera, L.; Núñez, Luis) Abstract The precise mechanism whereby gravitational collapse leads to a type II supernova event is one of the most controversial points in the ... -
Supersymmetry and large-scale left-right symmetry
(SABER ULA, 2005-01-06)Supersymmetry and large-scale left-right symmetry (Melfo, Alejandra; Aulakh, Charanjit S.; Rasin, Andrija; Senjanovic, Goran) Abstract We show that the low energy limit of the minimal supersymmetric Left-Right models ... -
Supervivencia de formas de cultivo de Trypanosoma cruzi en alimentos experimentalmente contaminados
(Boletín de malariología y salud ambiental. Vol. XLVIII, Nº 1, enero-julio, 2008, 2008-07)Se registra la supervivencia de formas de cultivo de Trypanosoma cruzi en alimentos experimentalmente contaminados. En 8 de 11 (73%) muestras de frutas y hortalizas utilizadas en los experimentos los parásitos permanecieron ... -
Supervivencia e infectividad de formas metacíclicas de Trypanosoma cruzi en alimentos experimentalmente contaminados
(2011-12-13)Se registra el tiempo de supervivencia de formas metacíclicas de Trypanosoma cruzi, obtenidas del tracto digestivo de Rhodnius prolixus, sobre alimentos contaminados experimentalmente. Observaciones entre 1h y 18h ... -
Supervivencia e infectividad de formas metacíclicas de Trypanosoma cruzi en alimentos experimentalmente contaminados
(Boletín de malariología y salud ambiental. Vol. XLIX, Nº 1, enero-julio, 2009, 2009-07)Se registra el tiempo de supervivencia de formas metacíclicas de Trypanosoma cruzi, obtenidas del tracto digestivo de Rhodnius prolixus, sobre alimentos contaminados experimentalmente. Observaciones entre 1h y 18h ... -
Swelling studies and adsorption of safranin T by acrylamide/maleic acid/methylene-bis-acrylamide based hydrogels
(2014-07-16)Swelling studies of an acrylamide/maleic acid/methylene-bis-acrylamide-based hydrogel prepared by free radical polymerization (weight ratio of 90/10/3) are presented. Water penetration mechanism was studied by using two ... -
Symmetries of distributional domain wall geometries
(SABER ULA, 2005-05-25)Symmetries of distributional domain wall geometries Pantoja, Nelson; Sanoja, Alberto Abstract Generalizing the Lie derivative of smooth tensor fields to distribution-valued tensors, we ... -
Symmetry nonrestoration at high temperature and the monopole problem
(SABER ULA, 2005-01-06)Symmetry nonrestoration at high temperature and the monopole problem (Melfo, Alejandra; Dvali, Gia; Senjanovic, Goran) Abstract We investigate the high temperature behavior of SU(5) in its minimal version. We show ...