Listar Articulos, Pre-prints (Facultad de Ciencias) por título

Mostrando ítems 428-447 de 488

    • Synchronization and collective behavior in globally coupled logarithmic maps 

      Cosenza, Mario; González, J. (SABER ULA, 2005-01-06)
      Synchronization and collective behavior in globally coupled logarithmic maps (Cosenza, Mario; González, J.) Abstract The phenomena of synchronization and nontrivial collective behavior in a system of globally coupled ...

    • Synthesis and characterization of trans-Mo(CO)4(p-C5NH4SO3Na)2 

      Suárez B., Trino; Fontal, Bernardo; Zambrano, Ghery; Reyes, Marisela del C.; Bellandi, Fernando; Contreras, Ricardo Rafael; Díaz, Juan C.; Cancines, Pedro I.; Fonseca V., Yuraima J.; Romero C., Isolda (Akadémiai Kiadó, Budapest and Springer, Dordrecht, 2008-03-12)
      Reaction between Mo(CO)6 and p-C5NH4SO3Na (1:2 (Mo: p-C5NH4SO3Na) stoichiometric ratio) gave the trans-Mo(CO)4(p-C5NH4SO3Na)2 complex, (1), in 80% yield. Complex (1) has been characterized by FTIR, 1H and 13C NMR spectroscopy. ...

    • Synthesis of light alkenes on manganese promoted. 

      González, Sergio; Oliveros Bastidas, Alberto; Mora, Asiloé J.; Rodulfo Baechler, Serbia M. A.; Orozco, José; Fontal, Bernardo; Delgado, Gerzon (SABER ULA, 2007-04-27)
      Synthesis of light alkenes on manganese promoted. (González Cortés, Sergio Luis; Rodulfo Baechler, Serbia M. A.; Oliveros Bastidas, Alberto; Orozco, José; Fontal, Bernardo; Mora, Asiloé J.; Delgado, Gerzon) Abstract The ...

    • Synthesis, characterization and hydroformylation catalytic activity of a water-soluble RhCl(CO)(PySO3Na)2 complex using 1-hexene and real naphtha 

      Fonseca V., Yuraima J.; Fontal, Bernardo; Reyes, Marisela del C.; Suárez B., Trino; Bellandi, Fernando; Díaz, Juan C.; Cancines, Pedro I. (2012-03-16)
      In this work, we describe the synthesis and characterization of a new water soluble [RhCl(CO)(PySO3Na)2], complex (1); where [PySO3Na] is the sodium salt of p-sulfonated pyridine ligand. Complex (1) was obtained in methanol, ...

    • Synthesis, characterization and olefin hydroformylation reactions of mer-[Mo(CO)3(p-C5H4N-CN)3] 

      Suárez B., Trino; Fontal, Bernardo; Parra, María F.; Reyes, Marisela del C.; Bellandi, Fernando; Díaz, Juan C.; Cancines, Pedro I.; Fonseca V., Yuraima J. (Springer Science+Business Media B.V. 2010, 2010-01-12)
      Mer-[Mo(CO)3(p-C5H4N-CN)3] was prepared by UV-irradiation of a THF solution of Mo(CO)6 and paracyanopyridine under heating. The complex was characterized by FT-IR, MS, 1H and 13C NMR and showed catalytic activity for olefin ...

    • Synthesis, characterization, and biphasic ionic liquid media 1-hexene hydrogenation reaction of RuCl2(DMSO)2(NC5H4CO2Na-3)2 

      Suárez B., Trino; Fontal, Bernardo; Vielma, Joel E.; Reyes, Marisela del C.; Bellandi, Fernando; Cancines, Pedro I.; Díaz, Juan C.; Fonseca V., Yuraima J. (Publicado en Science+Business Media B.V., 2011-06)
      RuCl2(DMSO)2(NC5H4CO2Na-3)2 is very soluble in the ionic liquid (IL) 1-n-butyl-3-methylimidazolium tetrafluoroborate, [(BMIM)BF4]. The complex was prepared by reacting RuCl2(DMSO)4 with NC5H4CO2Na-3, sodium nicotinate, in ...

    • Synthesis, thermal analysis and structural characterization of the ternary compound Ag2SnTe3 

      Delgado, Gerzon; Pirela B., María E.; Velásquez Velásquez, Ana; Villarreal, Manuel; Fernández, Braulio J.; Grima Gallardo, Grima Gallardo, Pedro (SaberULA, Venezuela, 2019-05-29)
      The ternary compound Ag2 SnTe3 has been synthesized and investigated by means of X-ray powder diffraction and its structure has been refined by the Rietveld method. The thermal differential analysis indicates a melting ...

    • Taller: De la música tradicional venezolana a la música popular contemporánea 

      Rago, Héctor (SABER ULA, 2008-07-02)
      Taller: De la música tradicional venezolana a la música popular contemporánea. El puente roto (Rago, Héctor) Resumen Se propone la realización de un taller dividido en tres (3) sesiones, durante las cuales se ...

    • Temblor cerca de Boconó (mininotisismo). 

      Laffaille, Jaime R. (SABER ULA, 2007-06-04)

    • Teoría de repulsión del par electrónico del nivel de valencia (TRPENV) 

      Suárez B., Trino (Venezuela, 2011-08-16)

    • Ternary semiconducting compounds with chalcopyrite - type structure 

      Rodulfo de Gil, Eldrys (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 ...

    • Técnicas de diseño, desarrollo y montaje de circuitos impresos 

      Salas Puente, Robert; Pérez Araujo, José Fernando; Ramírez, Jimer (Venezuela, 2008-11-10)
      El artículo nombra y brinda las funciones principales de las Herramientas Computacionales (CAD), utilizado por los autores, para el diseño de circuitos impresos, desarrollo del esquemático, simulación y fabricación del ...

    • The 3-dimensional einstein-klein-gordon system in characteristic numerical relativity. 

      Barreto Acevedo, Willians; Da Silva, A.; Gómez, R.; Lehner, R.; Rosales, L.; Winicour, J. (SABER ULA, 2005-09-18)
      The 3-dimensional einstein-klein-gordon system in characteristic numerical relativity. (Barreto Acevedo, Willians; Da Silva, A.; Gómez, R.; Lehner, R.; Rosales, L.; Winicour, J..) Abstract We incorporate a massless ...

    • The abelian topological mass mechanism from dimensional reduction 

      Khoudeir, Adel (SABER ULA, 2005-01-06)
      The abelian topological mass mechanism from dimensional reduction (Khoudeir, Adel) Abstract We show that the abelian topological mass mechanism in four dimensions, described by the Cremmer-Sherk action, can be ...

    • The evolution of discontinuities in radiating spheres in the diffusion approximation 

      Barreto Acevedo, Willians; Núñez, Luis; Herrera, L. (SABER ULA, 2005-12-08)
      The evolution of discontinuities in radiating spheres in the diffusion approximation (Barreto Acevedo, Willians; Herrera, L.; Núñez, Luis) Abstract The evolution of discontinuities in a general relativistic sphere ...

    • The gravitational and electrostatic fields far from an isolated Einstein-maxwell source. 

      Ocaríz E., José H.; Rago, Héctor (SABER ULA, 2006-08-03)

    • The large aperture gamma ray observatory as an observational alternative at high altitude 

      Núñez, Luis; Aglietta, M.; Allard, D.; Allekotte, I.; Alvarez, C.; Araujo, C.; Arturo, E.; Asorey, H.; Barrera, M.; Barros, H.; Bertou, X.; Camacho, E.; Carramiñana, A.; Carrasco, E.; Castillo, M.; Chirinos, J. M.; Conde, R.; Contreras, C.; Dasso, S.; De Castro, A.; Gómez Berisso, M.; García, I.; González, J.; Grajales, J.; Guada B., Carlos E.; Guevara Day, W. R.; López, J. A.; Laffaille, J.; Martínez, O.; Martin, R.; Melfo, A.; Mendoza, E.; Meza, E.; Miranda Loza, P.; Moreno Barbosa, E.; Murrugarra, C.; Otiniano Ormachea, L. J.; Perez, G.; Perez, Y.; Ponce, E.; Prada, J.; Quispe, J.; Rivera, H.; Rosales R., Misael D.; Rovero, A. C.; Saavedra, O.; Salazar, H.; Sanabria Gómez, J. D.; Santos Rodríguez, E.; Tello, J. C.; Ticona Peralda, R.; Torres, I.; Varela, E.; Velarde, A.; Vernetto, S.; Villasenor, L.; Villegas, J. C.; Wahl, D.; Zamalloa, M. A. (2011-02-04)
      A pesar de que las observaciones por satélite han permitido desvelar algunos misterios sobre el origen y localización de rayos cósmicos a bajas energías, hay preguntas aún no resueltas en los rangos mas altos de energías ...

    • The large aperture GRB observatory 

      Allard, D.; Alvarez, C.; Asorey, H.; Barros, Humberto J. V.; Bertou, Xavier; Castillo, M.; Chirinos, J. M.; De Castro, A.; Flores, S.; González, J.; Gomez Berisso, M.; Grajales, J.; Guada B., Carlos E.; W.R. Guevara, Day; Ishitsuka, J.; López, J. A.; Martínez, O.; Melfo, A.; Meza, E.; Miranda Loza, P.; Moreno Barbosa, E.; Murrugarra, C.; Núñez, Luis; Otiniano Ormachea, L.J.; Pérez, G.; Pérez, Y.; Ponce, E.; Quispe, J.; Quintero, Carlos; Rivera, H.; Rosales R., Misael D.; Rovero, A.C.; Saavedra, O.; Salazare, H.; Tello, J. C.; Ticona Peraldam, R.; Varela, E.; Velarde, A.; Villasenor, L.; Wahl, D.; Zamalloa, M.A. (http://arxiv.org/, Polonia, 2009-06-04)
      The Large Aperture GRB Observatory (LAGO) is aiming at the detection of the high energy (around 100GeV) component of Gamma Ray Bursts, using the single particle technique in arrays of Water Cherenkov Detectors (WCD) in ...

    • The science gateway LAGO virtual 

      Barrios Hernández, Carlos Jaime; Núñez, Luis; Quiñonez, Fernando A.; Torres, Luis A. (Venezuela, 2012-06)

    • The use of organic substrates with contrasting C/N ratio in the regulation of nitrogen use efficiency and lossesin a potato agroecosystem 

      Machado Díaz, Daniel; Sarmiento, Lina; Gonzalez-Prieto, S (Nutrient Cycl Agroecosystems 88(3): 411–427, Venezuela, 2010-12-01)
      The effect of the application of organic amendments of contrasting C/N ratio, combined with mineral N fertilizer, on the N budget of a potato crop was evaluated. The hypothesis was that the combination of substrates of ...