Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Mechanical Methods for Analyzing Nonlinear Parameters in the Skin
Tonnelier, E. ; Převorovský, Zdeněk ; Dos Santos, S.
The objective is to identify and evaluate the non-linear mechanical parameters of the human skin under loading measured by two different techniques. The first technique is based on ultrasound, and the second consists in analyzing the stress and displacement during the skin stretching. A small skin-loading, computer controlled device, equipped with ultrasonic, stress, and displacement transducers is attached to the human forearm by suction cups. Ultrasonic and mechanical parameters, recorded during programmed loading steps are related to the rheological model of the skin.
Elastodynamic Properties and Signal Propagation in Materials within Time Reversal Acoustics
Farová, Zuzana ; Převorovský, Zdeněk ; Kůs, V. ; Dos Santos, S.
In this paper we present related parts of elastodynamic theory, which are a keynote for the wave propagation through the medium. We describe the basic material characteristics - strain tensor and stress tensor, also we provide the relations of these tensors and describe the derivation of the well-know Lame's parameters. Further, we deal with the theory of Green functions, its properties, and its form for di®erent sources. Finally, we propose and explain the so-called experimental deconvolution, quite newly developed technique, based on time reversal acoustics with the knowledge of Green function and using the Fourier transform.

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