Geodesic
Wavefront reversal of sound on the surface of a liquid crystal
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1985), pp. 139-142 
R. B. Alaverdyan; Yu. S. Chilingaryan. Wavefront reversal of sound on the surface of a liquid crystal. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1985), pp. 139-142. http://geodesic.mathdoc.fr/item/UZERU_1985_3_a14/
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this work, for the first time, the effect of wavefront reversal of sound at the interface between a nematic liquid crystal (NLC) and air has been registered and experimentally studied. An increase in the intensity of reversed sound near the thermodynamic phase transition point (NLC–isotropic liquid) was experimentally established as compared to the regions of the highest phase stability.

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