Graduate School in Nonlinear Science

Sponsored by The Danish Research Agency

MIDIT                              OFD                          CATS
Modelling, Nonlinear Dynamics      Optics and Fluid Dynamics    Chaos and Turbulence Studies
and Irreversible Thermodynamics    Risø National Laboratory     Niels Bohr Institute and 
Technical University of Denmark    Building 128                 Department of Chemistry
Building 321                       P.O. Box 49                  University of Copenhagen 
DK-2800 Lyngby                     DK-4000 Roskilde             DK-2100 Copenhagen Ø
Denmark                            Denmark                      Denmark


by Dr. Meir Lewkowicz
Dept. of Physics
College of Judea and Samaria
Ariel 44837

MIDIT-seminar 484

Thursday, February 15, 2001, 14.00 h
at IMM, Building 305, Room 018, DTU

Abstract: In the analysis of complex systems (as the autonomic nervous system that governs the heart rate) one often presents the data in the form of recurrence or phase space plots. We demonstrate a new way to analyze such systems by the multipole expansion of the gravitational potential of the two-dimensional phase-space plot, where the density of points determines the mass density. We apply our approach to the heart beat interval series and find the the new measure is more effective than the traditional measures applied in research and clinics.