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Biomedical subjects

G V Osipov

Publications and source records attributed to G V Osipov.

6 recordsLinked to original sources
PubMed1999

Using weak impulses to suppress traveling waves in excitable media.

Here we propose mechanisms for suppressing non-steady-state motions--propagating pulses, spiral waves, spiral-wave chaos--in excitable media. Our approach is based on two points: (1) excitable media are multistable; and (2) traveling waves in excitable media can be separated into fast and slow motions, which can be considered independently. We show that weak impulses can be used to change the values of the slow variable at the front and back of a traveling wave, which leads to wave front and wave back velocities that are different from each other. This effect can destabilize the traveling wave, resulting in a transition to the rest state.

Journal Article↗
PubMed1999

Coherence resonance in excitable and oscillatory systems: the essential role of slow and fast dynamics.

Stochastic noise of an appropriate amplitude can maximize the coherence of the dynamics of certain types of excitable systems via a phenomenon known as coherence resonance (CR). In this paper we demonstrate, using a simple excitable system, the mechanism underlying the generation of CR. Using analytical expressions for the spectral density of the system's dynamics, we show that CR relies on the coexistence of fast and slow motions. We also show that the same mechanism of CR holds in the oscillatory regime, and we examine how CR depends on both the excitability of the system and the nonuniformity of the motion.

Journal Article↗
PubMedDate not supplied

[Methodological bases for designing multipurpose laboratories].

A well-grounded selection of the necessary minimum of measuring facilities is of paramount importance in projecting multipurpose laboratories. These facilities should ensure the required accuracy of analyses to be carried out, and measurements covering the whole dynamic range of the values variations. It was suggested to organise new multipurpose laboratories in accordance with technical and economical reasoning and with the calculated generalized index which shows a compliance of technical characteristics of the measuring equipment chosen with the methodical demands.

Equipment and Supplies↗