Modelling of HF wave propagation in the vicinity of quasicritical rays in the disturbed ionosphere

1998 ◽  
Vol 41 (1) ◽  
pp. 1-6 ◽  
Author(s):  
L. M. Erukhimov ◽  
A. A. Ponyatov ◽  
V. P. Uryadov ◽  
V. A. Ivanov ◽  
V. V. Shumaev ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Hf Wave ◽  
Disturbed Ionosphere

Prediction of HF wave propagation for “over the horizon” radar application

2014 ◽  
Author(s):  
Yannick Beniguel ◽  
Alain Reineix ◽  
Jorge Avella Castiblanco ◽  
Muriel Darces ◽  
Christopher Djoma ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Hf Wave

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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