Return to search

Stochastic resonance in nanoscale systems

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.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/1685
Date06 1900
CreatorsSaha, Aditya
ContributorsTuszynski, Jack A., Morsink, Sharon (Physics), Marchand, Richard (Physics), Hillen, Thomas (Math. and Stat. Sciences), Kouritzin, Michael (Math. and Stat. Science), Mogilner, Alex (External reader, University of California, Davis)
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeThesis
Format2468452 bytes, application/pdf
RelationA. A. Saha and J. A. Tuszynski, Adv. Media and Comm. Research 6, 122-156, (2010), A. A. Saha and J. A. Tuszynski, Jl. Comput. and Theor. Nanoscience, 8, 1-9 (2011), A. A. Saha and J. A. Tuszynski, Jl. Biol. Phys. (to appear), A. A. Saha, T. J. A. Craddock and J. A. Tuszynski, Biosystems (submitted)

Page generated in 0.0018 seconds