Sampling Theory and Wave Propagation

On: “Wave propagation and sampling theory” by J. Morlet, G. Arens, E. Fourgean, and D. Giard (GEOPHYSICS, 47, parts I and II, 203–236).

Geophysics ◽

10.1190/1.1441784 ◽

1984 ◽

Vol 49 (9) ◽

pp. 1562-1562

Author(s):

J. D. Laski

Keyword(s):

Wave Propagation ◽

Elastic Waves ◽

Energy Flow ◽

Sampling Theory ◽

Stress Strain ◽

Flow Vector ◽

Strain Relationship ◽

Compressional Velocity

Investigating waves for sedimentary series, Morlet et al. start from basic formulas for elastic waves. I have compared formulas used by Morlet et al. for: (a) compressional velocity of elastic waves, (b) stress‐strain relationship, and (c) energy flow vector (Poynting’s vector), with corresponding formulas in Koehler and Taner (1977). The results follow.

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Electron Microscopy of Shock Loaded Polycrystalline Beryllium

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052547 ◽

1974 ◽

Vol 32 ◽

pp. 506-507 ◽

Cited By ~ 1

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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