Krivoruchko Y. Electromagnetic waves propagation in the layered and porous media. Straight and inverse problems.

The thesis is devoted to the study of interaction processes of electromagnetic radiation with heterogeneous systems, in particular with porous media. With the use of relationship for determination of effective dielectric permeability of disperse systems and the theory of wave's propagation in flat-laminated media, it has been set connection between a reflection coefficient of electromagnetic waves and presence of water in porous media. A significant influence of water content in a porous dielectric on a reflection coefficient of electromagnetic waves has been proved.Comparison of numeral results with experimental data obtained from determination of effective permeability of high moisture soils has been performed for different models of dispersion media. For determination of radio engineering characteristics (reflectivity and transparency coefficients), the impedance method has been used. It has allowed investigation of an angular dependence for selected frequency range of electromagnetic waves. Thus, high moisture soil has been de-signed as a flat-laminated media with various dielectric permeabilities.It has been shown that multi-layered nano-covers with the alternating layers of gold and silver or dielectric and silver possess filter properties and unlike the stratified covers from pure dielectric films had a very narrow resonance domain width and a sharp decline of reflectivity coefficient peak.By generalization of Tikhonov method by introduction of additional scales discrepancy to the functional, inverse problems of radiometry have been solved. A functional minimum has been found by the method of random search with the use of the special binary sequences. The algorithm of solving of inverse problem has also been built in a locally porous media model for determination of percolation constituent.The obtained results have a practical orientation and, in particular, can be used in the systems of precise agriculture, at the radio engineering and at creation of different optical devices like filters and divisors.