Incoherent shock waves in long-range optical turbulence

2016 ◽  
Vol 333 ◽  
pp. 310-322 ◽  
Author(s):  
G. Xu ◽  
J. Garnier ◽  
D. Faccio ◽  
S. Trillo ◽  
A. Picozzi
Keyword(s):  
Shock Waves ◽  
Long Range ◽  
Optical Turbulence

scholarly journals Deep learning for anisoplanatic optical turbulence mitigation in long-range imaging

2021 ◽  
Vol 60 (03) ◽  
Author(s):  
Matthew A. Hoffmire ◽  
Russell C. Hardie ◽  
Michael A. Rucci ◽  
Richard Van Hook ◽  
Barry K. Karch
Keyword(s):  
Deep Learning ◽  
Long Range ◽  
Optical Turbulence ◽  
Range Imaging

scholarly journals Study of Two-Sided Similarity Methods Using a Radiation “Switch on” Imploding Shock in a Magnetic Field

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
J. R. A. J. NiCastro
Keyword(s):  
Magnetic Field ◽  
Shock Waves ◽  
Long Range ◽  
Small Angle ◽  
Similarity Solution ◽  
Large Angle ◽  
Direct Access ◽  
Scaling Relations ◽  
High Symmetry ◽  
Angle Measurements

This paper explores aspects of two-sided similarity modeling using cylindrical geometry for radiating shock waves embedded in a medium with a magnetic field. Two-sided similarity solution techniques may be used to link states influenced by long range near instantaneous fields that continually modify the pre- and postshock zones. Emergent radiation scaling relations are immediately available from consistent homologies. For both small angle and large angle measurements, an approximate analytic technique in the vicinity of luminous fronts together with the high symmetry implications delineated in Lemma provides direct access to the homology parameters. The parameters obtained using this process can augment the constraint relations and contribute to establishing relevant similarity homologies.

Thermodynamics and one dimensional shock waves in materials with memory

1966 ◽  
Vol 292 (1431) ◽  
pp. 562-574 ◽  
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Long Range ◽  
Materials With Memory ◽  
One Dimensional ◽  
Small Intensity ◽  
Linear Viscoelastic ◽  
Hugoniot Curves ◽  
With Memory ◽  
Arbitrary Intensity

We consider one dimensional shock waves in materials which do not conduct heat. We show that most of the classical theory of Hugoniot curves can be broadly generalized to substances having long range, non-linear, viscoelastic memory. For example, the presence of memory does not destroy the conclusion that the jump in entropy across a shock wave of small intensity is of order three or higher in the jump in the strain. The theorems of Bethe and Weyl on shocks of arbitrary intensity also can be generalized to materials with memory.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

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