Andrushenko V., Libov D. «On the high frequency vibrations of the piezoceramic disk» КОНСОНАНС-2011. Акустический симпозиум (27–29 сентября 2011 г.), с. 7-11 (2011)

The resonant frequencies of Pb(ZrTi)O₃ disk were studied. In the framework of elastic isotopic body the experimental frequencies were characterized. The theoretical solution of finite disk vibrations constructed of the displacements in the series of trigonometric and Bessel functions of the thickness and the radial directions respectively. Theoretical frequencies were found with necessary accuracy. In the low frequency range the edge resonance was predicted with high accuracy. The specific types of vibrations in high frequency range were described theoretically and confirmed experimentally. General good agreement in resonant frequencies between the theoretical and the experimental results was found.

Umaley K.D., Pethe G.B., Aswar A.S. «Volumetric, Viscometric, Acoustical, and Optical studies of Glutamic acid in aqueous Zinc and Copper chloride solutions» Химическая физика, 32, № 1, с. 44-55 (2013)

Ultrasonic velocity, density, viscosity and refractive index measurements of L-glutamic acid in aqueous zinc chloride and copper chloride solutions have been carried out at 303.15 K. From these experimental data isentropic compressibility, acoustic impendence, relative association, free path length, apparent molar volume, apparent molar isentropic compressibility and molar refraction of L-glutamic acid in aqueous solutions of electrolytes are evaluated. These values have been used to explain molecular association, solute-solvent interaction through hydrogen bonding and solvation. Viscosity data have been analyzed in the light of Jones–Dole equation and the constants A and B have been estimated and interpreted in terms of ion-ion, ion-solvent and molecular interactions occurring in solutions. DOI: 10.7868/S0207401X13010123