scholarly journals Correlation-enhanced control of wave focusing in disordered media

2017 ◽  
Vol 13 (5) ◽  
pp. 497-502 ◽  
Author(s):  
Chia Wei Hsu ◽  
Seng Fatt Liew ◽  
Arthur Goetschy ◽  
Hui Cao ◽  
A. Douglas Stone
Keyword(s):  
Disordered Media ◽  
Wave Focusing

Correlation-enhanced control of wave focusing in disordered media (Conference Presentation)

2018 ◽  
Author(s):  
A. Douglas Stone ◽  
Chiawei Hsu ◽  
Seng-Fatt Liew ◽  
Arthur Goetschy ◽  
Hui Cao
Keyword(s):  
Disordered Media ◽  
Wave Focusing

LBE Flows in Disordered Media

2018 ◽  
Author(s):  
Sauro Succi
Keyword(s):  
Porous Media ◽  
Fluid Mechanics ◽  
Condensed Matter ◽  
Disordered Media ◽  
Environmental Sciences ◽  
Science And Engineering ◽  
Particle Trajectories ◽  
Irregular Geometries ◽  
Numerical Tool ◽  
Bounce Back

The study of transport phenomena in disordered media is a subject of wide interdisciplinary concern, with many applications in fluid mechanics, condensed matter, life and environmental sciences as well. Flows through grossly irregular (porous) media is a specific fluid mechanical application of great practical value in applied science and engineering. It is arguably also one of the applications of choice of the LBE methods. The dual field–particle character of LBE shines brightly here: the particle-like nature of LBE (populations move along straight particle trajectories) permits a transparent treatment of grossly irregular geometries in terms of elementary mechanical events, such as mirror and bounce-back reflections. These assets were quickly recognized by researchers in the field, and still make of LBE (and eventually LGCA) an excellent numerical tool for flows in porous media, as it shall be discussed in this Chapter.

scholarly journals Anomalous Anderson localization behavior in gain-loss balanced non-Hermitian systems

Nanophotonics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 443-452
Author(s):  
Tianshu Jiang ◽  
Anan Fang ◽  
Zhao-Qing Zhang ◽  
Che Ting Chan
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Waves ◽  
Anderson Localization ◽  
Random Media ◽  
Normal Incidence ◽  
Disordered Media ◽  
One Dimensional ◽  
Gain Loss ◽  
The Waves ◽  
Localization Behavior

AbstractIt has been shown recently that the backscattering of wave propagation in one-dimensional disordered media can be entirely suppressed for normal incidence by adding sample-specific gain and loss components to the medium. Here, we study the Anderson localization behaviors of electromagnetic waves in such gain-loss balanced random non-Hermitian systems when the waves are obliquely incident on the random media. We also study the case of normal incidence when the sample-specific gain-loss profile is slightly altered so that the Anderson localization occurs. Our results show that the Anderson localization in the non-Hermitian system behaves differently from random Hermitian systems in which the backscattering is suppressed.

scholarly journals Topological Metric Detects Hidden Order in Disordered Media

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
Dominic J. Skinner ◽  
Boya Song ◽  
Hannah Jeckel ◽  
Eric Jelli ◽  
Knut Drescher ◽  
...  
Keyword(s):  
Disordered Media ◽  
Hidden Order

Guided Wave Focusing Mechanics in Pipe

2003 ◽  
Author(s):  
Takahiro Hayashi ◽  
Koichiro Kawashima ◽  
Zongqi Sun ◽  
Joseph L. Rose
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Guided Waves ◽  
Wave Structure ◽  
Guided Wave ◽  
Pipe Inspection ◽  
Specific Point ◽  
Wave Focusing ◽  
Beam Focusing ◽  
Subsequent Time

Guided waves can be used in pipe inspection over long distances. Presented in this paper is a beam focusing technique to improve the S/N ratio of the reflection from a tiny defect. Focusing is accomplished by using non-axisymmetric waveforms and subsequent time delayed superposition at a specific point in a pipe. A semi-analytical finite element method is used to present wave structure in the pipe. Focusing potential is also studied with various modes and frequencies.

Microjetting from wave focusing on oscillating drops

2007 ◽  
Vol 19 (5) ◽  
pp. 052101 ◽  
Author(s):  
S. T. Thoroddsen ◽  
T. G. Etoh ◽  
K. Takehara
Keyword(s):  
Wave Focusing

Laser induced short plane acoustic wave focusing in water

2007 ◽  
Vol 91 (5) ◽  
pp. 051128 ◽  
Author(s):  
Seung H. Ko ◽  
Sang G. Ryu ◽  
Nipun Misra ◽  
Heng Pan ◽  
Costas P. Grigoropoulos ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Wave Focusing ◽  
Plane Acoustic Wave

Numerical study of random lasing in three dimensional amplifying disordered media

2012 ◽  
Vol 285 (6) ◽  
pp. 1314-1322 ◽  
Author(s):  
Abbas Ghasempour Ardakani ◽  
Ali Reza Bahrampour ◽  
Seyed Mohammad Mahdavi ◽  
Mojtaba Golshani Gharyeh Ali
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Disordered Media ◽  
Random Lasing
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