Spatio-Temporal Instability Threshold Characteristics in Two-Level Atom Devices

1995 ◽  
pp. 97-131
Author(s):  
M. Le Berre ◽  
E. Ressayre ◽  
A. Tallet
Keyword(s):  
Instability Threshold ◽  
Level Atom ◽  
Temporal Instability ◽  
Spatio Temporal

Spatio-temporal instability in negative index materials

Optik ◽  
2019 ◽  
Vol 189 ◽  
pp. 15-22
Author(s):  
M. Shackeerali ◽  
A.K. Shafeeque Ali ◽  
A. Uthayakumar
Keyword(s):  
Negative Index ◽  
Negative Index Materials ◽  
Temporal Instability ◽  
Spatio Temporal

scholarly journals Magnetic holes in plasmas close to the mirror instability

2007 ◽  
Vol 14 (4) ◽  
pp. 373-383 ◽  
Author(s):  
D. Borgogno ◽  
T. Passot ◽  
P. L. Sulem
Keyword(s):  
Numerical Simulations ◽  
Fluid Model ◽  
Instability Threshold ◽  
Landau Damping ◽  
Larmor Radius ◽  
Maxwell System ◽  
Unstable Regime ◽  
Finite Larmor Radius ◽  
Spatio Temporal ◽  
Hall Mhd

Abstract. Non-propagating magnetic hole solutions in anisotropic plasmas near the mirror instability threshold are investigated in numerical simulations of a fluid model that incorporates linear Landau damping and finite Larmor radius corrections calculated in the gyrokinetic approximation. This FLR-Landau fluid model reproduces the subcritical mirror bifurcation recently identified on the Vlasov-Maxwell system, both by theory and numerics. Stable magnetic hole solutions that display a polarization different from that of Hall-MHD solitons are indeed obtained slighlty below threshold, while magnetic patterns and spatio-temporal chaos emerge when the system is maintained in a mirror unstable regime.

Spatio-temporal instability in free ultra-thin films

1998 ◽  
Vol 17 (3) ◽  
pp. 371-384 ◽  
Author(s):  
G.A. Shugai ◽  
P.A. Yakubenko
Keyword(s):  
Thin Films ◽  
Temporal Instability ◽  
Spatio Temporal

System of environment monitoring with spatio-temporal instability of information sources

2015 ◽  
Author(s):  
Yuriy Bobalo ◽  
Vladimir Rippenbeyn ◽  
Oleksander Lukianov ◽  
Rostyslav Smuk ◽  
Yuriy Storonitskiy ◽  
...  
Keyword(s):  
Information Sources ◽  
Environment Monitoring ◽  
Temporal Instability ◽  
Spatio Temporal

Modes in flow focusing and instability of coaxial liquid–gas jets

2009 ◽  
Vol 629 ◽  
pp. 1-23 ◽  
Author(s):  
TING SI ◽  
FANG LI ◽  
XIE-YUAN YIN ◽  
XIE-ZHEN YIN
Keyword(s):  
Velocity Profile ◽  
High Speed ◽  
Flow Instability ◽  
Flow Focusing ◽  
Instability Analysis ◽  
Flow Parameters ◽  
Temporal Instability ◽  
Air Stream ◽  
Spatio Temporal ◽  
Axisymmetric Disturbances

Six flow modes are distinguished in the flow-focusing experiments of a liquid jet forced by a high-speed air stream. The domains of the modes are identified on the parameter space of the liquid flow rateQland the gas pressure drop Δpg. The disturbance wavelength λ and breakup lengthLof the jet are also measured. A theoretical model considering axisymmetric disturbances is proposed, and a basic velocity profile of hyperbolic-tangent function is utilized. The linear temporal and spatio-temporal instability analyses are carried out using the Chebyshev collocation method. The effects of the flow parameters and the velocity profile on the flow instability are discussed. The temporal instability analysis demonstrates that the interfacial shear causes the instability of short waves and retards the instability of long waves. Moreover, the spatio-temporal instability analysis gives the transition boundary between the absolute and convective instability (AI/CI). The most unstable wavelength predicted by the temporal instability analysis and the AI/CI boundary predicted by the spatio-temporal instability analysis are in good agreement with the experimental results.

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