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Ara es mostren els items 31-50 de 53

    • Optimal seggregation of a two-component sample based on maximim population entropy: an application to astronomy 

      Alcobé López, Santiago; Catala-Poch, M.A.; Cubarsí Morera, Rafael (Birkhäuser Verlag, 2000)
      Text en actes de congrés
      Accés obert
      Determination of stellar population parameters from statistics of global samples is extremely sensitive to the noise introduced by few non-typical stars. In order to obtain a nearly-pure two-population mixture a subsample ...

    • Orbital eccentricities as indicators of stellar populations. II. Vertical velocity distribution from the Gaia DR2 catalogue 

      Cubarsí Morera, Rafael; Stojanovic, Milan; Ninkovic, Slobodan (EDP Sciences, 2021-08)
      Article
      Accés obert
      Context. In previous work, we showed how the planar and vertical eccentricities of disc stars, e and e' , could be used as indicators of the stars’ kinematic populations. For a local stellar sample drawn from the Gaia DR2 ...

    • Orbital eccentricities as indicators of stellar populations: a kinematical analysis of the local disc from GAIA DR2 catalogue 

      Cubarsí Morera, Rafael; Stojanovic, Milan; Ninkovic, Slobodan (EDP Sciences, 2021-02-09)
      Article
      Accés obert
      Aims. Based on a local sample from Gaia DR2 catalogue composed of 74 339 stars, we are able to derive more accurate kinematic statistics defining the local stellar populations and classify the stars in terms of their planar ...

    • Partition entropy and chi-squared error: the improved MEMPHIS algorithm - Part I 

      Cubarsí Morera, Rafael; Alcobé López, Santiago (2009-07)
      Report de recerca
      Accés obert
      The entropy of the population partition is studied as a function of the sampling parameter, so that within a particular interval of its graph, the plateau region, it is possible to get a stable estimation of the mixture ...

    • Principi de conservació del desenvolupament sostenible i el software lliure 

      Cubarsí Morera, Rafael; Escudero Royo, Miguel (Centre per a la Sostenibilitat, 2009-07-09)
      Text en actes de congrés
      Accés obert
      Així com l'energia total d'un sistema mecànic és la suma de l'energia cinètica i la potencial, podem dir que el desenvolupament en sostenibilitat és la suma 'ús de recursos' més ‘potencialitat d’ús’, en la justa mesura. ...

    • Problemes d'espais vectorials 

      Cubarsí Morera, Rafael (2015-10)
      Report de recerca
      Accés obert
      Problemes test d'espais vectorials

    • Problemes de matrius 

      Cubarsí Morera, Rafael (2015-11)
      Report de recerca
      Accés obert
      Problemes test de matrius

    • Programas del algoritmo de clasificacion de poblaciones normales trivariantes a partir de la entropia de mezcla 

      Cubarsí Morera, Rafael; Alcobé López, Santiago (2001-01)
      Report de recerca
      Accés obert
      The complete FORTRAN codified programs of the segregation algorithm described in Alcobé (2001) are described. The classification algorithm is applied to study the trivariate velocity distribution of stars from the star ...

    • Proteine Bolognese 

      Cubarsí Morera, Rafael; Vázquez, Esther; Villaverde, Antonio (2011-06)
      Article
      Accés obert
      Se modeliza la penetraci on de una versi on modi cada de la prote na verde uorescente llamada GFP en el citoplasma y el n ucleo de una c elula de mam fero. El modelo matem atico proporciona una primera aproximaci on ...

    • Proteine Bolognese 

      Cubarsí Morera, Rafael; Vázquez, Esther; Villaverde, Antonio (2010-06)
      Comunicació de congrés
      Accés obert
      Se modeliza la penetración de una versión modificada de la proteína verde fluorescente llamada GFP en el citoplasma y el núcleo de una célula de mamífero. El modelo matemático proporciona una primera aproximación al ...

    • Qüestions d'àlgebra lineal amb solucions 

      Cubarsí Morera, Rafael (2015-12)
      Report de recerca
      Accés obert
      Qüestions tipus test de l'assignatura d'Àlgebra Lineal de l'ETSETB (2015) amb solucions

    • Small-scale structure of the disc velocity distribution. A maximum entropy statistical approach - Part II 

      Cubarsí Morera, Rafael (2009-12)
      Report de recerca
      Accés obert
      Among metallicity, colour, and other star properties, the eccentricity of the star’s orbit behaves as a very good sampling parameter to find a more detailed structure for the disc velocity distribution, allowing distinctions ...

    • Structure of the velocity distribution of the Galactic disc: a maximum entropy statistical approach - Part I 

      Cubarsí Morera, Rafael (2009-09)
      Report de recerca
      Accés obert
      The maximum entropy approach is proposed to describe the local structures of the veloc- ity distribution, which are collected through its sample moments. The method is used with several samples from the HIPPARCOS and ...

    • Study of the self organizing map of one local stellar sample 

      Hernández Pajares, Manuel; Cubarsí Morera, Rafael; Monte Moreno, Enrique (F. MURTAGH AND A. HECK, 1992)
      Text en actes de congrés
      Accés obert

    • Switching cell penetrating and CXCR4-binding activities of nanoscale-organized arginine-rich peptides 

      Teixeira De Pinho Favaro, Marianna; Serna, Naroa; Sanchez Garcia, Laura; Cubarsí Morera, Rafael; Roldan, Monica; Sanchez Chardi, Alejandro; Unzueta, Ugutz; Mangues, Ramón; Ferrer Miralles, Neus; Rodrigues Azzoni, Adriano; Vazquez Gómez, Esther; Villaverde, Antonio (2018-08-01)
      Article
      Accés obert
      Arginine-rich protein motifs have been described as potent cell-penetrating peptides (CPPs) but also as rather specific ligands of the cell surface chemokine receptor CXCR4, involved in the infection by the human ...

    • Teorema astronómico de resistencia y unicidad 

      Cubarsí Morera, Rafael; Hernández Pajares, Manuel (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1993)
      Article
      Accés obert

    • The complete form of moment equations of stellar dynamics 

      Cubarsí Morera, Rafael (2007-03-30)
      Report de recerca
      Accés obert
      The exact mathematical expression for an arbitrary nth-order stellar hydrodynamic equation is explicitly obtained depending on the central moments of the velocity distribution. In such a form the equations are physically ...

    • The epicycle model 

      Cubarsí Morera, Rafael (2013-06)
      Article
      Accés obert
      Las soluciones de las ecuaciones del movimiento para una part cula de masa puntual bajo un campo de fuerzas conservativo estan generalmente ligadas a un conjunto b asico de integrales del movimiento, que dependen del ...

    • The self organizing map of neighbour stars and its kinematical interpretation 

      Hernández Pajares, Manuel; Cubarsí Morera, Rafael; Monte Moreno, Enrique (1993-02)
      Article
      Accés obert
      The Self-Organizing Map (SOM) is a neural network algorithm that has the special property ofcreating spatially organized tepresetüatioes of various features of input signals. The resulting maps resemble realneural structures ...

    • The shape of a galaxy is not much influenced by the potential as it might seem 

      Cubarsí Morera, Rafael (2013)
      Comunicació de congrés
      Accés obert
      The dynamics of a galaxy as a stellar system in statistical equilibrium is usually obtained from the superposition principle, based on the linearity of the Boltzmann collisionless equation (BCE) in regard to the phase space ...