Articulos, Pre-prints (Facultad de Ciencias): Envíos recientes
Voici les éléments 261-280 de 488
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Red bioclimática del estado Mérida: repositorio institucional de datos ambientales
(SABER ULA, 2008-08-29)Red bioclimática del estado Mérida: repositorio institucional de datos ambientales. (Contreras Zambrano, Hilda Yelitza; Méndez, Zulay V.; Torréns Heeren, Rodrigo J. y Núñez, Luis) Resumen Presentamos la experiencia ... -
Efecto de las variaciones de la presión térmica sobre el estado del gas interestelar
(SABER ULA, 2008-07-25)Efecto de las variaciones de la presión térmica sobre el estado del gas interestelar. (Mehrer Terradillos, Mariana y Parravano, Antonio) Resumen Se estudió el cambio del estado termoquímico del gas interestelar cuando ... -
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, ... -
Veinte años de utopía
(SABER ULA, 2008-07-15) -
Investigación científica de Venezuela
(SABER ULA, 2008-07-15) -
La ciencia como conocimiento público. El caso Venezolano
(SABER ULA, 2008-07-15) -
¿Y ahora qué?
(SABER ULA, 2008-07-15) -
X-ray structure of 6-deoxymikanokryptin, a new guaianolide from vernonia scorpiodes pers: 3-Oxo -1α, 7α, 8β,(H) -guaia-4(5), 11(13)-dien-8, 12-olide
(SABER ULA, 2008-07-14)X-ray structure of 6-deoxymikanokryptin, a new guaianolide from vernonia scorpiodes pers: 3-Oxo -1α, 7α, 8β,(H) -guaia-4(5), 11(13)-dien-8, 12-olide. (Gómez Caraballo, Dora María; Rivera, Valentina; Rodulfo de Gil, Eldrys; ... -
Ternary semiconducting compounds with chalcopyrite - type structure
(SABER ULA, 2008-07-14)Ternary semiconducting compounds with chalcopyrite - type structure. I fundamental equation and its physically acceptable solutions. (Rodulfo de Gil, Eldrys) Abstract The equation (1/4) (c/a)2 = σ2 + 2ασ - 2, which ... -
La investigación en la ULA: ¿mito o realidad en gestación?
(SABER ULA, 2008-07-14) -
X - ray structure of desacetoxysolaphyllidine, a steroid alkaloid from solanum hypomalacophyllum bitter: (22R, 23S, 25R) -22, 26- epimino -3β, 23 -dihydroxy- 5α -cholestan- 4 -one- ammonium acetate (1/1), C27 H45 NO3.NH4+.C2H3O2-
(SABER ULA, 2008-07-14)X - ray structure of desacetoxysolaphyllidine, a steroid alkaloid from solanum hypomalacophyllum bitter: (22R, 23S, 25R)-22,26-epimino-3β,23-dihydroxy-5α-cholestan-4-one-ammonium acetate (1/1), C27 H45 NO3.NH4+.C2H3O2- (Gómez ... -
X - ray crystal structure of trans-dichloro (hexaphenyl -1, 4,7, 10- tetraphosphadecane) ruthhenium (II)
(SABER ULA, 2008-07-14)X - ray crystal structure of trans-dichloro (hexaphenyl -1, 4,7, 10 -tetraphosphadecane) ruthhenium (II). (Rivera, Valentina; Rodulfo de Gil, Eldrys y Fontal, Bernardo) Abstract The synthesis and X- ray crystal structure ... -
X - ray structure of 1, 4-bis (diphenylphosphino) butane
(SABER ULA, 2008-07-14)X - ray structure of 1, 4-bis (diphenylphosphino) butane. (Rivera, Valentina; Gómez Caraballo, Dora María; Rodulfo de Gil, Eldrys y Suárez B., Trino) Abstract C28H28P2, Mr = 426.48, monoclinic, P21/c, a = 6.134 (2), ... -
Phenyl substituted cycloprpanes. I. Trans - 2 - (p- Tolyl) cyclopropanoic acid
(SABER ULA, 2008-07-12)Phenyl substituted cycloprpanes. I. Trans - 2 - (p- Tolyl) cyclopropanoic acid. (Belkis M., Ramírez V.; Rivera, Valentina; Rodulfo de Gil, Eldrys; Alonso Amelot, Miguel y Peckerar, Sarail) Resumen C11H12O2’ Mr = ... -
Phenyl-substituted cycloprpanes. II. Ethyl trans -2-phenylcycloprpane-1- carboxylate
(SABER ULA, 2008-07-12)Phenyl-substituted cycloprpanes. II. Ethyl trans –2–Phenylcycloprpane-1- carboxylate. (Mora, Asiloé J.; Rivera, Valentina; Rodulfo de Gil, Eldrys y Alonso Amelot, Miguel) Resumen C12H14O2, Mr = 190.24, orthorhombic, ... -
Lie Groups of Conformal Motions acting on Null Orbits
(SABER ULA, 2008-07-02)Lie Groups of Conformal Motions acting on Null Orbits (Carot, Jaume; Coley, A. A.; Sintes, A. M.) Abstract Space-times admitting a 3-dimensional Lie group of conformal motions acting on null orbits containing a ... -
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 ... -
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 ... -
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 ...