Sergio Rojas
Full Professor
Universidad Simón Bolívar
Departamento de Física
Apartado Postal 89000, Caracas 1080-A, Venezuela
Teléfono: +58-212-9063603 | e-mail: srojas@usb.ve


 
Versión en español

Education



 
Research Interests

 
Publications

  1. W. Barreto and S. Rojas, An equation of state for radiating dissipative spheres in general relativity, Astrophysics and Space Science 193, 201 (1992)
  2. S. Rojas and J. Koplik, Non-linear flow in porous media, Physical Review E 58, 4776 (1998)
  3. J. M. Guevara-Jordán and S. Rojas, A method of fundamental solution for modeling porous media advective fluid flow, Applied Numerical Mathematics 47, 449 (2003)

  4. S. Rojas, J. Castillo, J. Guevara, and S. Castillo, A comparative numerical study of two mimetic finite differences methods for solving the steady diffusion equation with rough coefficients on non-uniform grids, in: Simulación Numérica y Modelaje Computacional, edited by J. Rojo, M. J. Torres, and M. Cerrolaza (2004), p. TM1
  5. M. Freites-Villegas, J. M. Guevara-Jordán, O. R. Rojas, J. E. Castillo, and S. Rojas, A mimetic finite difference scheme for solving the steady state diffusion equation with singular functions, in: Simulación Numérica y Modelaje Computacional, edited by J. Rojo, M. J. Torres, and M. Cerrolaza (2004), p. TM25
  6. S. Rojas and J. M. Guevara-Jordán, Modeling porous media flow using the method of fundamental solutions, in: Proceedings of the 6th Caribbean Conference on Fluid Dynamics (2004)
  7. J. M. Guevara-Jordán, S. Rojas, M. Freites-Villegas y J. E. Castillo, A new second order finite difference conservative scheme, Divulgaciones Matemáticas 13, 107 (2005)
  8. J. M. Guevara-Jordán and S. Rojas, On second order mimetic discretization scheme for boundary layers problems, in Simulación y Modelado en Ingeniería y Ciencias, edited by B. Gámez, D. Ojeda, G. Larrazábal, and M. Cerrolaza (2006), p. TM-33
  9. S. Rojas and J. M. Guevara-Jordán, Solving diffusion problems on non-uniform grids via a second order mimetic discretization scheme, in Simulación y Modelado en Ingeniería y Ciencias, edited by B. Gámez, D. Ojeda, G. Larrazábal, and M. Cerrolaza (2006), p. TM-17
  10. S. Rojas, Trinomial (finite bethe) trees and the numerical pricing of american-style options, in Simulación y Modelado en Ingeniería y Ciencias, edited by B. Gámez, D. Ojeda, G. Larrazábal, and M. Cerrolaza (2006), p. VA-27
  11. E. Escalante, C. Echeverría, P. Guillén, S. Rojas, and P. J. Colmenares, Estudio del rendimiento de la técnica DPD utilizando estrategias en arquitecturas paralelas, Revista Mexicana de Física S 52, 45 (2006)
  12. R. Rangel and Sergio Rojas, Efectos de la mojabilidad o adherencia en el desplazamiento inestable entre dos fluidos miscibles en un medio poroso vía simulación Monte Carlo DLA, Ciencia 15, 77 (2007)
  13. R. Rangel and S. Rojas, Montecarlo DLA type simulation of non-wetting (drainage) stable displacement in porous media, Ciencia 15, 242 (2007)
  14. J. M. Guevara-Jordán, S. Rojas, M. Freites-Villegas, and J. E. Castillo, Convergence of a mimetic finite difference method for static diffusion equation, Advances in Difference Equations, Art. No. 12303 (2007)
  15. S. Rojas and J. M. Guevara-Jordán, Solving boundary-layer like problems by a new second order conservative discretization scheme, accepted in Ciencia
  16. E. Valdeblánquez, S. Rojas, and P. Martín, On teaching Neumann Green´s function, Ciencia 16, 215 (2008)
  17. S. Rojas, On the need to enhance physical insight via mathematical reasoning, Revista Mexicana de Física E 54, 75 (2008)
  18. S. Rojas and J. M. Guevara-Jordán, A new second order mimetic finite difference scheme to tackle boundary layers-like problems, in New Trends in Fluid Mechanics Research, edited by F. G. Zhuang and J. C. Li (Springer and Tsinghua University Press, 2007), p. 730
  19. S. Rojas, C. Candanoza Santos, and J. M. Guevara Jordán, Procesamiento de señales vía análisis de componentes independientes, in "Desarrollo y Avances en Métodos Numéricos para Ingeniería y Ciencias Aplicadas, edited by L. Martino, V. Carrera, G. Larrazábal and M. Cerrolaza (2008), p. PS-21
  20. S. Rojas and J. M. Guevara Jordán, On Second Order Mimetic and Conservative Finite Difference Discretization Schemes, Revista Mexicana de Física 54, 141 (2008)
  21. R. Rangel and S. Rojas, Montecarlo DLA-type simulations of wetting effects in fluid displacement in porous media, Computational Geosciences 13, 215 (2009)
  22. S. Rojas, An approach to enhance the teaching of undergraduate engineering introductory physics courses, Proceedings of The Seventh Latin American and Caribbean Conference for Engineering and Technology (LACCEI 2009), p. WE1-1 (2009)
  23. S. Rojas, Repeated problem solving revisited, American Journal of Physics 77, 487 (2009)
  24. R. Rangel and S. Rojas, Stochastic modeling of fluid displacement in porous media and its impact in oil recovery engineering, Memorias de la ULA, number 2 (2009)
  25. S. Rojas, Comment on 'From Moon-fall to motions under inverse square laws', European Journal of Physics 31, L97 (2010)
  26. Y. Gandica, M. del Castillo-Mussot, G. J. Vázquez, and S. Rojas, Continuous opinion model in small world directed networks, accepted in Physica A
  27. S. Rojas, Comment on `The centre of mass of a triangular plate' by V Slüsarenko et al Eur. J. Phys. 29 (2008) 1177-82, European Journal of Physics 31, L39 (2010)
  28. S. Rojas, On the teaching and learning of physics problem solving, Revista Mexicana de Física E 56, 22 (2010)


 
Other Publications
  1. S. Rojas and J. Moody, Cross-sectional analysis of the returns of ishares MSCI index funds using independent component analysis, CSE610 Internal Report, Oregon Graduate Institute of Science and Technology (2001)


 
Students Advised
  1. Claudia Candanoza Santos, Undergraduate Thesis (Universidad Central de Venezuela, Caracas, 2008)


 
  Condensed Matter & Complex Systems
  Group at USB