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Permanent link (DOI): https://doi.org/10.7939/R3V646

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Stochastic resonance in nanoscale systems Open Access

Descriptions

Other title
Subject/Keyword
Stochastic resonance
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Saha, Aditya
Supervisor and department
Tuszynski, Jack A.
Examining committee member and department
Mogilner, Alex (External reader, University of California, Davis)
Hillen, Thomas (Math. and Stat. Sciences)
Marchand, Richard (Physics)
Morsink, Sharon (Physics)
Kouritzin, Michael (Math. and Stat. Science)
Department
Department of Physics
Specialization

Date accepted
2011-01-06T22:04:38Z
Graduation date
2011-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
This thesis considers the possibility of stochastic resonance (SR) in the following nanoscale systems: (i) hard-threshold devices; (ii) averaging structures of carbon nanotubes (CNTs); (iii) myoglobin atoms; and finally (iv) tubulin dimers. The description of SR is carried out using Kramers' rate theory in the adiabatic two-state approximation for continuous systems and using Shannon's information theoretic formalism for systems with static nonlinearities. The effective potentials are modelled by asymmetric or symmetric bistable wells in a single reaction co-ordinate. Quantum considerations have not been invoked. Hence, all results are implicitly valid in the high-temperature regime of relevance to industrial applications. It is established that information transmitted by arrays of identical CNTs is maximized by non-zero noise intensities and that the response of myoglobin and tubulin dimers to ambient molecular forces (as described by the signal-to-noise ratio or SNR) is enhanced by increasing temperature. Sample calculations are shown for solvent fluctuations, ligand interactions and dipole oscillations. These results can be used to explain: (i) the effects of temperature observed in fabrication processes for CNTs; (ii) the dynamical transition observed in myoglobin and (iii) the 8.085 MHz resonance observed in microtubules.
Language
English
DOI
doi:10.7939/R3V646
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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