Localization and scattering of acoustic waves in a one-dimensional random system: A proposed experiment

1985 ◽  
Vol 32 (1) ◽  
pp. 495-498 ◽  
Author(s):  
C. A. Condat ◽  
T. R. Kirkpatrick
Keyword(s):  
Acoustic Waves ◽  
Random System ◽  
One Dimensional ◽  
System A ◽  
Scattering Of Acoustic Waves

LIGHT PROPAGATION IN ORDERED AND RANDOM ONE-DIMENSIONAL SYSTEMS BY CAVITY FORMATION

2006 ◽  
Vol 20 (11n13) ◽  
pp. 1661-1670
Author(s):  
S. MAROUF ◽  
N. ZEKRI
Keyword(s):  
Periodic Structure ◽  
Light Propagation ◽  
Random Medium ◽  
Resonant Cavity ◽  
Light Transport ◽  
Random System ◽  
One Dimensional ◽  
System A ◽  
Light Localization ◽  
The Impact

We study how the light transport behavior evolves when a one-dimensional (1-D) system changes continuously from a perfectly ordered structure to a highly disordered structure. The introduction of randomness to a periodic structure enhances light localization in frequency regions in which it is delocalized in a periodic structure. To better understand the phenomenon and further investigate how the cavity is formed, we conduct a systematic study of the impact of the material and geometric properties of a random medium on the performance of random lasers; in a completely random system, a resonant cavity is formed by two stacks of multiple layers which serve as two highly reflective broadband mirrors. We calculate the size and the quality factor of 1-D random cavities.

Prediction of Combustion Dynamics in a Staged Premixed Combustor

2002 ◽  
Author(s):  
Jeffery A. Lovett ◽  
Kevin T. Uznanski
Keyword(s):  
Acoustic Waves ◽  
Fuel Injection ◽  
Acoustic Path ◽  
Fuel Injector ◽  
Combustion Instabilities ◽  
Dimensional Model ◽  
Flow Paths ◽  
Combustion Dynamics ◽  
One Dimensional ◽  
System A

Combustion instabilities are a major challenge in the development of low-emissions premixed gas turbine combustors. The development and demonstration of predictive capabilities for instabilities has progressed considerably. One of the major fundamental mechanisms demonstrated in several instances is the convection of fuel concentration fluctuations from the fuel injector to the reaction zone. A one-dimensional model has been developed which captures this mechanism coupled to solutions for standing acoustic waves. Since many real combustion systems include multiple flow paths for mixing and/or staged fuel injection, the model has been extended to include a parallel acoustic path and two fuel injection locations. Splitting of fuel between two injection positions is a common method to influence combustion dynamics toward a more operable system. A relatively simple model which only partially couples acoustics and heat release was applied to an axially staged combustor and the predictions are compared with the experimental behavior. The results from this model successfully predict the overall dynamics behavior as a function of the fuel split between the two injection locations.

scholarly journals Resonant excitation of acoustic waves in one-dimensional exciton-polariton systems

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
A. V. Yulin ◽  
V. K. Kozin ◽  
A. V. Nalitov ◽  
I. A. Shelykh
Keyword(s):  
Acoustic Waves ◽  
Resonant Excitation ◽  
One Dimensional
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