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13 papers · 2 filters
Sleep-Wake Differences in Scaling Behavior of the Human Heartbeat: Analysis of Terrestrial and Long-Term Space Flight Data
Plamen Ch. Ivanov, Armin Bunde, Luís A. N. Amaral +5
We compare scaling properties of the cardiac dynamics during sleep and wake periods for healthy individuals, cosmonauts during orbital flight, and subjects with severe heart diseas…
Dependence of Conductance on Percolation Backbone Mass
Gerald Paul, Sergey V. Buldyrev, Nikolay V. Dokholyan +4
On two-dimensional percolation clusters at the percolation threshold, we study , the average conductance of the backbone, defined by two points separated by Euclidean d…
Glass Transition in a 2D Lattice Model
E. Eisenberg, A. Baram
The dynamics of compaction of hard cross-shaped pentamers on the 2D square lattice is investigated. The addition of new particles is controlled by diffusive relaxation. It is shown…
Scaling of the distribution of shortest paths in percolation
Nikolay V. Dokholyan, Youngki Lee, Sergey V. Buldyrev +3
We present a scaling hypothesis for the distribution function of the shortest paths connecting any two points on a percolating cluster which accounts for {\it (i)} the effect of th…
Multifractality in Human Heartbeat Dynamics
Plamen Ch. Ivanov, Luís A. Nunes Amaral, Ary L. Goldberger +4
Recent evidence suggests that physiological signals under healthy conditions may have a fractal temporal structure. We investigate the possibility that time series generated by cer…
Anomalous Size Dependence of Relaxational Processes
Armin Bunde, Shlomo Havlin, Joseph Klafter +2
We consider relaxation processes that exhibit a stretched exponential behavior. We find that in those systems, where the relaxation arises from two competing exponential processes,…