Search academic texts

Information × Registration Number 0224U000848, 0122U001482 , R & D reports Title Quasiparticle interaction with the nanostructure surfaces with various roughness’s value. popup.stage_title Head Niemchenko Konstantyn E., Доктор фізико-математичних наук Registration Date 14-01-2024 Organization V.N. Karazin Kharkiv National University popup.description2  An analytical solution to the problem of heat flux caused by the ballistic motion of sound quanta diffusely reflected from the side walls of a two-dimensional dielectric material is presented. An explicit analytical expression for the temperature profile in the linear dependence approximation is obtained; explicit equations for the particle flux and transfer coefficients of a sample with an arbitrary width-to-length ratio are derived. The analytical expressions are in very good agreement with the numerical solutions of the integral equations describing these quantities, which were obtained at the first stage of the work. The obtained analytical relations can be used for further studies in the case of mixed specular and diffuse reflection of waves of different nature from interfaces. The second part of the paper presents a theoretical consideration of the phenomenon, a region with an increased energy density of wave particles that occurs when two beams intersect in helium. This problem allows us to consider the nonlinear interaction of waves inmedia with anomalous dispersion. In this paper, we analyze the results of observations and theoretically consider the formation of a "hot line". The results of the calculations are also compared with experimental data on the dependence of the hot line parameters on the power of the initial beams and the angle between their directions of motion. Product Description popup.authors Ermakov Oleg E Vihtinska Tetyna G. Niemchenko Yehor K. Nemchenko Kostyatyn E. Protektor Denys O. Rogova Svitlana Yurievna popup.nrat_date 2024-01-14 Close