Acoustic penetration at subcritical grazing angles: Measurements and comparison with simulations based on perturbation theory

2000 ◽  
Vol 108 (5) ◽  
pp. 2510-2510
Author(s):  
Darrell R. Jackson ◽  
Kevin L. Williams ◽  
Dajun Tang ◽  
Eric I. Thorsos
Keyword(s):  
Perturbation Theory ◽  
Acoustic Penetration ◽  
Grazing Angles

A Perturbation Theory for the Population of Atomic Energy Levels in Non-Lte Plasmas

1988 ◽  
Vol 102 ◽  
pp. 343-347
Author(s):  
M. Klapisch
Keyword(s):  
Perturbation Theory ◽  
Small Parameter ◽  
Classification Scheme ◽  
Sum Rules ◽  
Energy Levels ◽  
Natural Classification ◽  
Quantum Numbers ◽  
Formal Expansion ◽  
Atomic Energy Levels ◽  
As Effects

AbstractA formal expansion of the CRM in powers of a small parameter is presented. The terms of the expansion are products of matrices. Inverses are interpreted as effects of cascades.It will be shown that this allows for the separation of the different contributions to the populations, thus providing a natural classification scheme for processes involving atoms in plasmas. Sum rules can be formulated, allowing the population of the levels, in some simple cases, to be related in a transparent way to the quantum numbers.

Energy, Information, and Superluminal Speed in Quantum Electrodynamics

2020 ◽  
pp. 27-33
Author(s):  
Boris A. Veklenko
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Quantum Electrodynamics ◽  
Excited Atom ◽  
Standard Quantum ◽  
Energy Information

Without using the perturbation theory, the article demonstrates a possibility of superluminal information-carrying signals in standard quantum electrodynamics using the example of scattering of quantum electromagnetic field by an excited atom.

Intensity of Choppy Sea Radar Backscattering for Small Grazing Angles

2004 ◽  
Vol 61 (2) ◽  
pp. 104-115
Author(s):  
V. G. Gutnik ◽  
G. P. Kulemin ◽  
L. I. Sharapov ◽  
E. A. Goroshko
Keyword(s):  
Radar Backscattering ◽  
Grazing Angles
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