The dispersion law for elastic surface acoustic waves and the dependence of the surface acoustic mode width on the concentration of adsorbed atoms have been found. The calculations are carried out in the long-wave approximation for the interaction between the adatoms with regard for image forces and the non-local elastic interaction between the adsorbed and matrix atoms. K e y w o r d s: deformation potential, adatoms, non-local elastic interaction, image forces, surface acoustic mode width.

The theory of nucleation of nanoscale structures of the adsorbed atoms (adatoms), which occurs as a result of the self-consistent interaction of adatoms with the surface acoustic wave and electronic subsystem is developed.Temperature regimes of formation of nanoclusters on n-GaAs surface under the action of laser irradiation are investigated. The offered model permits to choose optimal technological parameters (temperature, doping degree, intensity of laser irradiation) for the formation of the surface periodic defect-deformation structures under the action of laser irradiation.

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Non-linear theory of diffusion of impurities in porous materials upon ultrasonic treatment is described. It is shown that at a defined value of deformation amplitude, an average concentration of vacancies and temperature as a result of the effect of ultrasound possibly leads to the formation of nanoclusters of vacancies and to their periodic educations in porous materials. It is shown that at a temperature smaller than some critical value, a significant growth of a diffusion coefficient is observed in porous materials.

Abstract-Time-frequency and time dependence of the output signal morphology of nonlinear oscillator neuron based on Van der Pol model using analytical and numerical methods were investigated. Threshold effect neuron, when it is exposed to external non-stationary signals that vary in shape, frequency and amplitude was considered.Index Terms-Nonlinear oscillator neuron, frequency modulation, morphology of the information signal, resonance effect, encoding and decoding of information.