Professor Jüri Engelbrecht is widely known as an outstanding scholar in various branches of mechanics and mathematical physics. Through many years, he has been one of the main contributors to the intensive development of science and academic education in his homeland Estonia and far beyond it, on the European scale. His public service is commensurate with his scientific merits. Jüri's sphere of interests is vast, and it always belonged to the cutting edge of mechanics and thermodynamics. This is the reason why we decided to submit our work to Jüri's jubilee collection of papers; we dedicate it to our dear colleague and friend with the hope that it may get along with his long-time professional aspirations.