Cespe UnB

Editorial Assistants:
W. Abrahão
G. Oliveira
L. Salgueiro

Editorial Technical Support:
D. H. Diaz
M. A. Gomez
J. Barbosa

Editorial management and production:

95/105= 0.91


The problem of short times for brownian motion and diffusion equation

doi: 10.6062/jcis.2013.04.03.0075


J. M. Silva, J. A. S. Lima and M. P. M. A. Baroni


The studies on diffusive particles (immersed in a fluid or gas) which can be described by a parabolic diffusion equation usually leads to an infinite speed of propagation. In general, this apparent propagation speed is the result of neglecting the atomistic structure of matter and considering a frequency of finite collision. A favorable argument on this idea comes from the possibility that parabolic equations transmit signs with infinite speeds. In order to solve this difficulty, it is convenient to treat the problem from a point of view of a wave treatment. In the present paper, we presented a study on the hyperbolic differential equation describing the behavior of the brownian particle. In particular, when the numeric and exact solutions are compared the result privileges a finite speed of propagation.



[1] P. Chatterjee, L. Hernquist and A. Loeb, “Phys. Rev. Lett.” 88, 121103 (2002).

[2] R. N. Mantegna and H. E. Stanley, "An introduction to econophysycs: Correlations and Complexity in Finance" , Cambridge-University Press, (2000).


Combining wavelets and linear spectral mixture model for MODIS satellite sensor time-series analysis
doi: 10.6062/jcis.2008.01.01.0005
Freitas and Shimabukuro(Free PDF)

Riddled basins in complex physical and biological systems
doi: 10.6062/jcis.2009.01.02.0009
Viana et al.(Free PDF)

Use of ordinary Kriging algorithm and wavelet analysis to understanding the turbidity behavior in an Amazon floodplain
doi: 10.6062/jcis.2008.01.01.0006
Alcantara.(Free PDF)

A new multi-particle collision algorithm for optimization in a high performance environment
doi: 10.6062/jcis.2008.01.01.0001
Luz et al.((Free PDF)

Reviewer Guidelines
(Under Construction)
Advertises Media Information