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O caso das savanas tropicais da América do Sul: quando a sustentabilidade econômica e ecológica não é suficiente
(2006)O caso das savanas tropicais da América do Sul ilustra as complexas interrelações entre as características ecológicas dos ecossistemas terrestres naturais e os seus usos. As savanas tropicais estão determinadas por um ... -
Ofiseula-ruleteo
(SABER ULA, 2008-06-30) -
On duality in the born-infeld theory
(SABER ULA, 2005-01-06)On duality in the born-infeld theory (Khoudeir, Adel; Parra, Yoan) Abstract The SL(2,R) duality symmetric action for the Born-Infeld theory in terms of two potentials, coupled with non-trivial backgroud fields in ... -
On supersymmetry at high temperature
(SABER ULA, 2005-01-06)On supersymmetry at high temperature (Melfo, Alejandra; Bajc, Borut; Senjanovic, Goran) Abstract While it is possible to find examples of field theories with a spontaneously broken symmetry at high temperature, in ... -
On the collineations of distribution-valued Ricci tensor fields of domain wall spacetimes.
(SABER ULA, 2007-03-27)On the collineations of distribution-valued Ricci tensor fields of domain wall spacetimes. (Pantoja, Nelson y Sanoja, Alberto) Abstract Generalizing the Lie derivative to distribution-valued tensors, we examine the ... -
On the definition of cylindrical symmetry
(SABER ULA, 2008-07-02)On the definition of cylindrical symmetry (Carot, Jaume; Senovilla, José M. M.; Vera, Raül) Abstract The standard definition of cylindrical symmetry in general relativity is reviewed. Taking the view that axial ... -
On the eccentricity behaviour of radiating slowly rotating bodies in general relativity
(SABER ULA, 2006-01-26)On the eccentricity behaviour of radiating slowly rotating bodies (Núñez, Luis; Hernández, Hector; Herrera, Luis; Percoco, Umberto) Abstract We study different models of radiating slowly rotating bodies up to the ... -
On the general structure of Ricci collineations for type B warped spacetimes.
(SABER ULA, 2005-08-18)On the general structure of Ricci collineations for type B warped spacetimes (Flores, J. L.; Parra, Yoan; Percoco, Umberto.) Abstract A complete study of the structure of Ricci collineations for type B warped spacetimes ... -
On the geometry of warped spacetimes
(SABER ULA, 2008-07-02)On the geometry of warped spacetimes (Carot, Jaume; da Costa, J.) Abstract An invariant characterization of warped spacetimes is given and a classification scheme for them is proposed. Some results on the curvature ... -
On the spontaneous break down of massive gravities in 2+1 dimensions
(SABER ULA, 2005-01-06)On the spontaneous break down of massive gravities in 2+1 dimensions (Khoudeir, Adel; Aragone, Carlos; Pío José, Arias) Abstract We show that locally Lorentz invariant, third order, topological massive gravity can ... -
Operating water cherenkov detectors in high altitude sites for the large aperture GRB observatory
(http://arxiv.org/, Polonia, 2009-06-04)Water Cherenkov Detectors (WCD) are efficient detectors for detecting GRBs in the 10 GeV - 1 TeV energy range using the single particle technique, given their sensitivity to low energy secondary photons produced by high ... -
Optimization of Benzoxazinones as natural herbicide models by Lipophilicity enhancement.
(SABER ULA, 2007-04-09)Optimization of Benzoxazinones as natural herbicide models by Lipophilicity Enhancement. (Macías, Francisco A.; Marín, David; Oliveros Bastidas, Alberto y Molinillo G., José Abstract Benzoxazinones are plant allelochemicals ... -
Optimum phase-behavior formulation of surfactant/oil/water systems for the determination of chromium in heavy crude oil and in bitumen-in-water emulsion
(SABER ULA, 2006-02-01)Optimum phase-behavior formulation of surfactant/oil/water systems for the determination of chromium in heavy crude oil and in bitumen-in-water emulsion. (Burguera, José L.; Ávila G., Rita M.; Pascu de Burguera, Marcela; ... -
Padrões fitogeográficos e sus relação com sistemas de terra no bioma cerrado
(Matiko, S., Pedrosa de Almeida, S. y J.F. Ribeiro (Eds). Cerrado: Ecología e flora.Vol 1. EMBRAPA, BrasiL, pp. 213-228., Brasil, 2008) -
Los paisajes sismicos.
(SABER ULA, 2007-06-04) -
Papas negras, papas de páramo.
(SABER ULA, 2005)En este trabajo se presenta el problema de la desaparición de las semillas indígenas o nativas, en el sistema papero de Los Andes de Mérida. Estas semillas, cuyas variedades son conocidas bajo el nombre popular de "papas ... -
El papel de la dispersión de semillas en la regeneración de la vegetación de páramo en un paisaje fragmentado
(Venezuela, 2013-07)La conservación y restauración del ecosistema páramo en Venezuela es una prioridad por su alta diversidad, su gran número de endemismos y por la pequeña superficie que ocupa. En este trabajo se pretende abordar la investigación ... -
Parecen lejanos los tsunamis de Asia...
(SABER ULA, 2007-06-04) -
El Parque Nacional Sierra Nevada. ¿Medio siglo de consolidación? Una visión multidimensional de sus valores y perspectivas
(2012-06-19)A fin de visualizar el contexto en que se desenvuelven los parques nacionales como figura conceptual, amparada por soportes de diferente índole, sobre la que se ejercen una serie de presiones y se generan amenazas que ...