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Mobility of Frenkel Excitons

Vladimir M. Agranovich

in Excitations in Organic Solids

Published in print:
2008
Published Online:
January 2009
ISBN:
9780199234417
eISBN:
9780191715426
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199234417.003.0014
Subject:
Physics, Atomic, Laser, and Optical Physics

This chapter discusses the different regimes of mobility of Frenkel excitons. The diffusion equation and diffusion-related quantities (diffusion coefficient/length, diffusion constant, exciton mean ... More


Cooperative local dynamics – the glass-transition zone

C. M. Roland

in Viscoelastic Behavior of Rubbery Materials

Published in print:
2011
Published Online:
September 2011
ISBN:
9780199571574
eISBN:
9780191728976
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199571574.003.0002
Subject:
Physics, Condensed Matter Physics / Materials

When the density of segments becomes sufficiently high, the motions of polymer chains are governed primarily by intermolecular cooperativity. With continued cooling or pressurization, the timescale ... More


Thermal noise

Melvin Lax, Wei Cai, and Min Xu

in Random Processes in Physics and Finance

Published in print:
2006
Published Online:
January 2010
ISBN:
9780198567769
eISBN:
9780191718359
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198567769.003.0005
Subject:
Physics, Theoretical, Computational, and Statistical Physics

This chapter provides an introduction to thermal noise, which can be regarded as ubiquitous. The chapter includes a review of the experimental evidence, the thermodynamic derivation for Johnson ... More


Models of asset fluctuations

Peter Richmond, Jürgen Mimkes, and Stefan Hutzler

in Econophysics and Physical Economics

Published in print:
2013
Published Online:
December 2013
ISBN:
9780199674701
eISBN:
9780191780066
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199674701.003.0010
Subject:
Physics, Theoretical, Computational, and Statistical Physics

This chapter aims to construct analytical models of asset fluctuations using the framework of Fokker-Planck equations, together with the generalised diffusion constants, and shows that simple trial ... More


Generalized diffusion processes and the Fokker‐Planck equation

Peter Richmond, Jürgen Mimkes, and Stefan Hutzler

in Econophysics and Physical Economics

Published in print:
2013
Published Online:
December 2013
ISBN:
9780199674701
eISBN:
9780191780066
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199674701.003.0007
Subject:
Physics, Theoretical, Computational, and Statistical Physics

This chapter discusses the Chapman-Kolmogorov equation, but limits the scope to Markov processes. It is shown here how it can be reduced to the Fokker-Planck partial differential equation, using the ... More


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