Multifractality in human heartbeat dynamics
Article Abstract:
The healthy heartbeat time series contains significant phase correlations which are cancelled in the surrogate signal by the randomization of the Fourier phases, according to research into the possibility that time series produced by certain physiological control systems could belong to a special class of complex processes which need a large number of exponents to characterize their scaling properties. These correlations are weaker in heart-failure subjects. It appears that multifractality is linked with nonlinear features of the healthy heartbeat dynamics.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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The web of human sexual contacts
Article Abstract:
The sexual behaviour of a random sample of people has been studied to show the mathematical features of a sexual-contact network. A key finding was the scale-free nature of the connectivity of an objectively defined, non-professional social network.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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Sexual contacts and epidemic thresholds
Article Abstract:
Various kinds of sexual partnerships are examined. The solution of the epidemiological question, of whether the pronounced skew partnership distribution is variantly finite is described.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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