Reconstructing the parameters of geofields taking measurement noise into account. Part I. Techniques for smoothing,filtration, and regularization

Various methods of interpolation (approximation, smoothing, and filtering types) which take measurement noise into account (piecewise polynomial approximation, smoothing splines, kriging, filters, etc.) are analyzed. It is found that regularization methods are used in all of them. The advantages and disadvantages of these methods are pointed out and prospects for the use of program packages by nonspecialists in mathematics and information technology are examined. Recommendations regarding the proper choice of estimation techniques, quality criteria, and parameters for monitoring them are made in the case where geofields are to be approximated and modelled.     

Reconstructing the parameters of geofields taking measurement noise into account. Part II. Techniques for identification,regularization, and soft computing

Various methods for reconstructing the parameters of geofields taking measurement noise into account are analyzed. Program packages for nonspecialists in the theory of programming are discussed. Recommendations are given regarding the correct choice of method and control parameters for approximating and modelling geofields. The advantages and disadvantages of these methods in different stages of the recovery of the parameters of geofields are examined. It is proposed that fuzzy neural networks be utilized in the early stage when the data are uncertain and limited.     

Effect of the structure and charge state on the strength properties of nanocomposites based on PP + <Emphasis Type="Italic">D</Emphasis><Subscript>k2</Subscript> films

In this work, we study the effect of the structure and charge state on the strength properties of nanocomposites prepared on the basis of polypropylene (PP) and D _k2 nanoclays. It is shown that the addition of the D _k2 nanoclay into the PP polymer increases the concentration of the centers of localization of electric charges; that is, interfacial layers are formed at the polymer-nanoclay interface; they can play the role of a trap for charges; this results in an increase in the density and stability of the electret charges. A change in the interfacial interactions and the thickness of the boundary layer can have an effect on the strength properties of the nanocomposite.     

Effect of annealing on the structure of Bi2Te3-Bi2Se3 films

The crystallization dynamics of Bi₂Te₃-Bi₂Se₃ polycrystalline films annealed at 200–230°C has been investigated. The formation of ordered blocks 70—150 nm in size, depending on the annealing time and temperature, is observed.