This paper presents the numerical part of the research program on concrete-filled steel columns. Nonlinear, three dimensional FE analysis of axial compression, was conducted using the finite element program ABAQUS. The numerical results were validated through comparison with experimental data in terms of ultimate loading and deformation modes. Modeling related problems such as the definition of boundary conditions, imperfections, concrete-steel interaction, material representation and others are investigated using a comprehensive parametric study. The developed FE models will be used for an enhanced interpretation of experiments and for the predictive study of cases not included in the experimental testing.

This paper briefly describes direct power control methods for two- and threelevel AC/DC converters and their modified DPC 3H 2-? and the DPC 5H2-? algorithms. It also presents two new control methods DPC-3Am (direct power control 3 areas with modification) and the DPC-3L-3Am (direct power control 3 levels 3 areas with modification). The research results were used to compare the described methods. The comparison was based on an average value of switching frequency and current distortion coefficient. Experimental investigations into the methods have shown that the use of the modified DPC methods reduces the number of switchings by more than 70% compared with the standard DPC method.

The purpose of the study is to reconstruct the cognitive semantics of the verbal predicates “чудиться”, “почудиться”, taking into account their inner form, and also to suggest a linguo‑cognitive model for explaining polysemy. The object of the study is the different contextual meanings of the verbal predicates “чудиться”, “почудиться” in the contexts of fictional discourse, the subject is cognitive semantics as a repeated structure of cognitive processes reflecting the patterns of understanding and thinking. The article presents a typology of contexts for the functioning of verbal predicates, their different contextual meanings are defined, the semantic dependence of the contextual meaning of the verb word on the semantics of the broader context analyzed, the role of the inner form in the creation of polysemy determined, while a linguo‑cognitive model for explaining polysemy in terms of “gestalt”, “focus”, “background – figure”, “focusing – defocusing” is suggested.