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Biomedical subjects

A Bershadskii

Publications and source records attributed to A Bershadskii.

8 recordsLinked to original sources
PubMed2003

Multiscaling of galactic cosmic ray flux.

Multiscaling analysis of the differential flux dissipation rate of galactic cosmic rays (carbon nuclei) is performed in the energy ranges 56.3-73.4 MeV/nucleon and 183.1-198.7 MeV/nucleon, using the data collected by the ACE/CRIS spacecraft instrument for the year 2000. The analysis reveals strong (turbulencelike) intermittency of the flux dissipation rate for short-term intervals: 1-30 h. It is also found that the type of intermittency can be different in different energy ranges.

Anisotropy↗
PubMed2002

Anomalous three-dimensional symmetries of solar-wind plasma.

An example of a combination of Kolmogorov three-dimensional properties with Alfvén two-dimensional properties in solar-wind plasma is given using recent data obtained with the Advanced Composition Explorer satellite at the L1 libration point. Both spectral and moments scaling analyses are used to demonstrate the possibility of such a combination. Two-decade scaling and the large number of the scaling exponents under consideration indicate the robustness of this observation.

Journal Article↗
PubMed2002

Mean wind and its reversal in thermal convection.

Properties of the mean wind in thermal convection, especially the abrupt reversal of its direction at high Rayleigh numbers, are studied. Measurements made in a closed cylindrical container of aspect ratio 1 are analyzed, and both the long-term and short-term behaviors of the direction reversals are discussed. A first look at the data suggests a Brownian-type process in action, but a closer look suggests the existence of hierarchical features with time scales extending roughly over a decade and a half. A physical model consistent with experimental observations is presented, and the origin of the cutoff scales is discussed. It appears that the generation of the wind as well as the reversal of its direction can be understood in terms of the imbalance between buoyancy effects and friction.

Journal Article↗
PubMed2001

Probabilistic properties of wavelets in kinetic surface roughening.

Using the data of a recent numerical simulation [M. Ahr and M. Biehl, Phys. Rev. E 62, 1773 (2000)] of homoepitaxial growth it is shown that the observed probability distribution of a wavelet based measure of the growing surface roughness is consistent with a stretched log-normal distribution and the corresponding branching dimension depends on the level of particle desorption.

Journal Article↗
PubMed2001

Local properties of extended self-similarity in three-dimensional turbulence.

Using a generalization of extended self-similarity we have studied local scaling properties of incompressible homogeneous isotropic three-dimensional turbulence in a direct numerical simulation. We have found that these properties are consistent with log-normal-like behavior of the velocity increments with moderate amplitudes for space scales r beginning from Kolmogorov length eta up to the largest scales, and in the whole range of the Reynolds numbers: 50 < or = R(lambda) < or = 459. The locally determined intermittency exponent mu(r) varies with r; it has a maximum at scale r=14 eta, independent of R(lambda).

Journal Article↗
PubMed1999

Some properties of multifractality at solid-on-solid growth processes.

It is shown that multifractality of large deposition probabilities observed in a simple model of crystal growth (the Das Sarma model with neglected surface diffusion, desorption, and hop) corresponds to another type of statistical distribution: multifractal Bernoulli distribution. Lognormal distribution is also discussed in this context.

Journal Article↗