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Dmytruk I. First and second sounds in a degenerate Bose gas [Електронний ресурс] / I. Dmytruk, A. Svidzynskiy, P. Shygorin // Физика низких температур. - 2017. - Т. 43, № 6. - С. 860-866. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2017_43_6_8 In this work the propagation of sound waves in a degenerate quantum gas is considered. We modify the Wang Chang and Uhlenbeck method for description of the sounds in a Maxwell gas for the case of a degenerate quantum gas. Using this approach, we constructed a dispersion relation for sound waves in a condensed Bose gas at finite temperatures, and calculate the velocities of first and second sounds in the first approximation. The possibility of the theoretical investigation for sound damping is discussed.
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Shygorin P. P. Calculation of Josephson current in a two-barrier tunnel junction [Електронний ресурс] / P. P. Shygorin, A. V. Svidzynskyi, I. O. Materian // Ukrainian journal of physics. - 2017. - Vol. 62, № 6. - С. 518-525. - Режим доступу: http://nbuv.gov.ua/UJRN/Ukjourph_2017_62_6_10
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