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Active motions of Brownian particles in a generalized energy-depot model

Title
Active motions of Brownian particles in a generalized energy-depot model
Authors
Zhang Y.Kim C.K.Lee K.-J.-B.
Ewha Authors
이공주복
SCOPUS Author ID
이공주복scopus
Issue Date
2008
Journal Title
New Journal of Physics
ISSN
1367-2630JCR Link
Citation
vol. 10
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We present a generalized energy-depot model in which the rate of conversion of the internal energy into motion can be dependent on the position and velocity of a particle. When the conversion rate is a general function of the velocity, the active particle exhibits diverse patterns of motion, including a braking mechanism and a stepping motion. The phase trajectories of the motion are investigated in a systematic way. With a particular form of the conversion rate dependent on the position and velocity, the particle shows a spontaneous oscillation characterizing a negative stiffness. These types of active behaviors are compared with similar phenomena observed in biology, such as the stepping motion of molecular motors and amplification in the hearing mechanism. Hence, our model can provide a generic understanding of the active motion related to the energy conversion and also a new control mechanism for nano-robots. We also investigate the effect of noise, especially on the stepping motion, and observe random walk-like behavior as expected. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
DOI
10.1088/1367-2630/10/10/103018
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자연과학대학 > 물리학전공 > Journal papers
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