This paper deals with the methods for investigating the nonlinear dynamics of discrete chaotic systems (DCS) applied to piecewise linear systems of the third order. The paper proposes an approach to the analysis of the systems under research and their improvement. Thus, effective and mathematically sound methods for the analysis of nonlinear motions in the models under consideration are proposed. It makes it possible to obtain simple calculated relations for determining the basic dynamic characteristics of systems. Based on these methods, the authors developed algorithms for calculating the dynamic characteristics of discrete systems, i.e. areas of the existence of steady-state motion, areas of stability, capture band, and parameters of transients. By virtue of the developed methods and algorithms, the dynamic modes of several models of discrete phase synchronization systems can be analyzed. They are as follows: Pulsed and digital different orders, dual-ring systems of various types, including combined ones, and systems with cyclic interruption of auto-tuning. The efficiency of various devices for information processing, generation and stabilization could be increased by using the mentioned discrete synchronization systems on the grounds of the results of the analysis. We are now developing original software for analyzing the dynamic characteristics of various classes of discrete phase synchronization systems, based on the developed methods and algorithms.

A new ternary telluride, FeAsTe, was synthesized from elements at 600 °C. It crystallizes in the hexagonal P6/mmc space group with the unit cell parameters a = 3.85091(9) Å and c = 17.1367(4) Å for δ = 0.3 and y = 0.04. Its layered crystal structure contains partially occupied intralayer and interlayer Fe positions, which give rise to significant nonstoichiometry: FeAsTe was found to possess the homogeneity range of 0.25 < δ < 0.45 and y = 0.04. Regions of local vacancy ordering alternate with regions of randomly distributed vacancies, so that the ordering of Fe atoms and vacancies is not complete in the average structure. Clear evidence of the magnetic phase transition is obtained by thermodynamic measurements, Mössbauer spectroscopy, and neutron powder diffraction. Magnetic susceptibility measurements reveal weak ferromagnetism below T = 123 K with a net moment of M∼ 0.1μ/Fe at T = 2 K. This transition is confirmed by differential scanning calorimetry. Additionally, neutron powder diffraction indicates the onset of a complex AFM-like magnetic ordering below 100 K.

Development of effective monitoring systems of power exchange fluctuations and proportional alignment of loading on gas-diesel-generator units requires carrying out detailed researches both their own fluctuations, and exchange fluctuations in case of parallel work of several units. Carrying out such researches on real objects is limited to their considerable cost and can be given only at the final stage. Therefore it is very important for developers to have adequate models of the studied objects.The researches of output voltage frequency fluctuations for real objects executed by authors showed that in general they have casual character, and these fluctuations in all range of loadings represent non-stationary casual process with the changing population mean and dispersion. Authors developed mathematical model of the regulator stabilizing exchange fluctuations of power in the studied system. But there was a question of its hardware realization because it requires solving the problem of identification of the structure of this system and on-line monitoring of changes in its parameters and signals.The authors have proposed a candidate solution for such a problem through the example of identification and synthesis of the system of measuring system performance indicators required to appraise the electric power quality in this system and, as consequence, performance quality.Index Terms-Drilling platforms, electric power quality, gasdiesel-generator units, identification and tracking.

The use of digital solutions in various fields of activity today allows you to adapt to the digital needs of customers. The adoption of information technology by the subjects of the transport complex was not quick at the beginning, but development has accelerated since then and now they allow optimizing their activities. The article discusses the current regulatory documents in the field of digitalization of seaports. An analysis of cargo turnover by Russian seaports was made, and it was noted that one of the important factors affecting the increase in this indicator is the implementation of digital solutions. Examples of information technologies in the world and in Russia used in the activities of seaports are given.

The use of semiconductor converters as a part of sea drilling platforms' electrical power systems is the cause of rising of electromagnetic compatibility and inactive power problems that demands an incorporation of the active filter compensation devices. It is known that in such real systems the capacitor of filter is discharging because of the existence of active power losses and it has negative impact on electric power quality. In the article, authors propose advanced ANFIS controller that allows to reduce the maximum voltage deviation on capacitor bank, and to reach of the established voltage value within several periods of circuit voltage. The suggested controller was modeled in the ANFIS editor of the MATLAB software environment. It is shown that by mean of number of proposed innovations the consumed computing power of the digital system realizing the ANFIS controller decreased in dozens of times in comparison with regular fuzzy logic controller implementation.