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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Seismic noise: unfortunate companion of seismic measurements but also a scout from the Earth's depths
 Růžek, Bohuslav ; Zedník, Jan
Seismic records are contamined by noise. In classical approach elastic waves generated by an earthquake or a quary blast are considered as a deterministic signal and seismic noise as a random signal. Commonly noise is removed or at least reduced by filtering. In recent years also an opposite approach appeared. Propagation of noise followed the same principles as for the deterministic signals - it is medium dependent.
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Generation of elastics waves by moveing source
 Ježdík, Roman ; Landa, Michal
Principle of elastic waves generation by moving source realized by transducer array is performed. Numerical model of this generation technique is used for studying reflection and refraction coefficient on planar water-glass interface. Comparison with retical values of coefficients is done. Differences between numerical model and theory are discussed.
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The Elastic Wave Propagation in Prismatic Bodies with the Shape Transition
 Morávka, Š. ; Hora, Petr
The work treats the elastic wave propagation in the basic elements of structures. Results of analytical computations (generalized ray theory), numerical simulations (FEM implemented in MARC/MENTAT) and experimental results (broadband piezoceramic transducers) are compared mutually. Samples with the most commom shape transitions are used.
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Elastic waves in anisotropic plates
 Hora, Petr ; Červená, Olga
Contributiondeals with description of general solution procedure of wave propagation inunbounded media, on the surface of a half-space and in an infinitely wideplate for anisotropic material. The algorithms of solution procedure for allof these cases are presented here.
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