Numerical solution for diffusion in periodic potentials: A comparison with the theory of activated processes

1985 ◽  
Vol 32 (3) ◽  
pp. 1827-1829 ◽  
Author(s):  
Fabio Marchesoni
Keyword(s):  
Numerical Solution ◽  
Periodic Potentials ◽  
Activated Processes

scholarly journals CONTROLLING ACTIVATED PROCESSES

2001 ◽  
Vol 01 (01) ◽  
pp. C1-C6
Author(s):  
M. I. DYKMAN ◽  
BRAGE GOLDING
Keyword(s):  
Crystal Growth ◽  
Metastable State ◽  
High Frequency ◽  
Applied Field ◽  
Control Mechanisms ◽  
Separation Techniques ◽  
Selective Control ◽  
Periodic Potentials ◽  
Activated Processes

The rates of activated processes, such as escape from a metastable state and nucleation, are exponentially sensitive to an externally applied field. We describe how this applies to modulation by high-frequency fields and illustrate it with experimental observations. The results may lead to selective control of diffusion in periodic potentials, novel control mechanisms for crystal growth, and new separation techniques.

Backscattering Analysis of Cylinder Shaped Scatterer in Vegetation Medium: Comparison Between Theories

2020 ◽  
Vol 2 (1) ◽  
pp. 15-18
Author(s):  
Syabeela Syahali ◽  
Ewe Hong Tat ◽  
Gobi Vetharatnam ◽  
Li-Jun Jiang ◽  
Hamsalekha A Kumaresan
Keyword(s):  
Numerical Solution ◽  
Cross Section ◽  
Traditional Method ◽  
Microwave Remote Sensing ◽  
Solution Model ◽  
Complex Nature ◽  
Good Match ◽  
Equivalent Source ◽  
Backscattering Cross Section ◽  
Method Model

This paper analyses the backscattering cross section of a cylinder both using traditional method model and a new numerical solution model, namely Relaxed Hierarchical Equivalent Source Algorithm (RHESA). The purpose of this study is to investigate the prospect of incorporating numerical solution model into volume scattering calculation, to be applied into microwave remote sensing in vegetation area. Results show a good match, suggesting that RHESA may be suitable to be used to model the more complex nature of vegetation medium.

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