Binary sequences with a period of 4q (where q is an odd prime) and an optimal autocorrelation magnitude are considered. Sequences are defined using prime modulus biquadratic residue classes and direct product of residue class rings. It is shown that they have a high symmetric 2-adic complexity. The 2-adic complexity of a sequence is defined as the smallest number of carry-feedback shift register cells that is capable to generate a sequence. Symmetric 2-adic complexity is preferred over 2-adic complexity when evaluating the unpredictability of binary sequences. The research method is based on the application of generalized Gaussian sums over rings of residue classes. Binary sequences with high linear and 2-adic complexity and good autocorrelation properties are of interest for cryptographic applications, in particular, for stream encryption.

The issues of mathematical description of differential, multiplicative, and combined methods of digital processing of multispectral images are discussed. The method of conducting an experiment on the qualitative and quantitative comparative evaluation of images is described. The results of qualitative and quantitative evaluation of images obtained with various processing options are presented. The correspondence of the values of the color coefficients is evaluated when using various methods of digital processing of multispectral images. It is concluded that the mathematical description of signal processes in a television multispectral system with overlapping areas of the registration zones of radiant fluxes corresponds to the results of experimental research.

The existing system for maintaining the functional readiness of radio electronic equipment (REE), which was formed on the basis of practical experience in the targeted use of radio equipment and modern amendments to it, nevertheless, does not fully comply with modern requirements for practical use and the level of complexity of existing and developed equipment. This discrepancy lies in the fact that, on the one hand, significant damage is inflicted on readiness due to prolonged downtime of the REE on the regulations, and, on the other hand, the gain in reliability is insignificant due to the required measures. Due to the fact that complete information about the reliability of electronic equipment elements is never known, as well as the fact that the real reliability in the process of targeted use of electronic equipment changes under the influence of external factors, it is advisable to use a flexible adaptive system for processing technical information and functionality (PTIF), which will allow "adjust" the volume and frequency of preventive maintenance taking into account the current information on the reliability of the REE. It seems that an adaptive approach to the management organization is the most acceptable for the overwhelming number of REE samples. It can be seen as a generalization of the state-based control approach. In accordance with this, the article proposes an algorithm for increasing automated systems for assessing functional readiness by including the tasks of predicting the functional state of REE and calculating the optimal timing and volume of control actions.

The article deals with the selection of object images in television systems for applied purposes, namely, one of the methods of object selection based on compensation of non-uniformity background. An approach to adapting the method to the conditions of convergence of an object with a video surveillance point is described. Additional processing of the input signal is considered, which provides an exchange of resolution for the signal-to-noise ratio as the object size increases. Variants of structural schemes of the selection device are given. The results obtained by computer simulation of the adapted method are discussed. Examples of test images and graphs of quantitative dependencies are provided. Comparative diagrams of the average, maximum and root-mean-square deviation of the coordinates of the selected object from the reference values for all frames of the test video sequence for the adapted and original method are shown.

The formulation and solution of the problem of automatic recognition of target images by estimates of their impulse response (IR) is considered. These IR are obtained as a result of digital adaptive processing of the received random process (RP) in a multifrequency radar with simultaneous emission of signals with different carrier frequencies in conditions of parametric a priori uncertainty of statistical characteristics (SC). The received signal is the response of a finite impulse response (FIR) or infinite impulse response (IIR) filter against a background noise. It is assumed that the number of poles and zeros of the system function is a priori unknown and in the process of automatic recognition should be estimated from the samples of the input RP. In accordance with this condition, the weighting coefficients and the number of poles and zeros of the system filter function and its FIR or IIR components are estimated.

The analysis of noise stability of a demodulator with quadrature amplitude modulation (KAM-16) in channels with multipath when changing the configuration of the boundaries of the signal constellation is carried out. The proposed method of analysis is based on the use of the vector algebra apparatus, which allows taking into account the fine structure of the multipath field, including the values of information symbols, delays of reflected signals, as well as their amplitudes and phases. The noise stability of reception was determined on the basis of integral distribution functions of signal distances to decision boundaries obtained by computer modeling. It is shown that the transformation of signal boundaries is effective only for small delays of reflected signals. Increasing the delay of reflected signals within the duration of sending significantly reduces noise stability. It is established that in a channel with multipath, the rotation of the decision boundaries can increase the noise immunity of the demodulator by 10 dB compared to the system without rotation.

The solution to the problems of calculating the reliability indicators of infocommunication systems is based, as a rule, on statistical data. Their collection and processing are carried out by the monitoring system. To obtain the most accurate results of indicators calculation, it is necessary to conduct a large number of measurements. The article aims to make a forecast the parameters based on autoregressive models. The article considers methods of regression analysis and solves a problem indicators estimation based on experimental values for data trend forecasting. As a result, a solution to the problem of identifying the time series of variables by least squares method is proposed.

In proton-proton scattering during pomeron exchange, the corresponding quark tubes of a colored chromoelectric field are directed oppositely to each other and repel. In the nucleus-nucleus interaction, there are several pomeron exchanges; quark tubes begin at valence quarks and end at valence diquarks. Diquarks carry, on average, twice as much momentum as a valence quark. Accordingly, the length of a part of the diquark tube is longer than the end of the quark tube and decays later than the quark tube. The remaining parts of the diquark tubes are directed in one direction and are attracted. Therefore, a regime change will occur in the fast part of the spectrum in nucleus-nucleus scattering. For the NICA accelerator, nonvacuum regions are also important, the tubes of which are directed in the same way as diquark tubes. This leads to an increase in the attraction effect.

The article discusses principles of compatibility of a new innovative technology, including neurotechnology and virtual reality. Information about the basic principles of neurotechnology is provided. Having a common basis, each of the approaches has individual implementation principles, from stimulation with small current discharges to implantation of chips. To date, neurotechnologies have achieved significant development, gaining recognition and application in many areas of the social sphere. Their presence, while remaining invisible, has a significant impact on the world around us. The article also discusses the areas of application of neurotechnologies, the advantages that they provide, as well as the risks that arise in this case, which should be taken into account. The device of the Mind Link neuro-headset is described. The advantages of the joint application of neurotechnologies and virtual reality are justified. It is shown what results can be achieved with the joint use of these innovations, as well as further ways of developing this technology.

The receiver consists of two-spectral eight-channel photo receiver. The photodetector consisted of two parallel four-element arrays of photodiodes. Short-wavelength photodetectors are made on a silicon chip, and long-wavelength photodetectors are based on a germanium chip. Photodiode strips are located at a distance of 100 microns. The receiving areas were 100 x 100 μm². The spectral sensitivity range was 0.48 - 1.03 µm for shortwave channels and 0.68 - 1.71 µm for long-wavelength channels. Operating frequency band is 0-2·10⁵ Hz.

Gaussian two-armed bandit problem is considered. Awards are assumed to have unknown expected values and unknown variances. Gaussian two-armed bandits may prove useful in a batch processing scenario, when there are two methods available. It is demonstrated that expected regret value is a continuous function of reward variance when using UCB1 strategy. Monte-Carlo simulations are used to show the nature of the relation between variance estimation and losses. It is shown that using an incorrect estimate is equivalent to using non-optimal parameters of the strategy, but the regret grows only slightly when the estimation error is fairly large, which allows to estimate the variance during the initial steps of the control.

Etching of GaN/AlGaN heterostructures on a Sentech SI-500 installation with an inductively coupled plasma source is considered. Etching was carried out in a chlorine-containing Cl₂/Ar gas mixture with the addition of various amounts of oxygen. The influence of various technological factors on the etching rate and etching selectivity between GaN and AlGaN layers: the amount of oxygen in the gas mixture, power source, inductively coupled plasma, high-frequency power. Etching modes have been established in which the selectivity of etching of GaN/AlGaN layers reaches 30:1. Based on the developed plasma etching technology, a route for manufacturing transistors based on heterostructures with conductive cap layers has been developed. It is shown that the characteristics are improved when using a conductive cap layer by reducing the contact resistance and channel resistance. The values of the current density of 380 mA/mm and the steepness of 143 mS/mm are obtained.

In this article, we reviewed the studies of electric osmosis in porous and capillary structures. We have considered methods for modeling electroosmotic flow and the effect of porous structure parameters on it. We also analyzed the effect of a magnetic field and a combination of fields — magnetic and electric — on the electroosmotic flow. We considered an example of the implementation of an electroosmotic pump in a liquid cooling system, which indicates the prospects of its use in such systems, its reliability and manufacturability. However, there is currently no example of practical implementation of an electroosmotic pump in heat pipes. The lack of practical samples makes research in this direction urgent. Our work will allow us to create new types of heat pipes with the ability to operate them in any position in space.

This article presents the results of studies of magnetoelectric composite structures based on GaAs [100]. Magnetoelectric structures of Metglas/GaAs/Metglas with different orientations in the plate plane were studied experimentally (11-1), (1-10), (101), plate dimensions: 20×5×0.625 mm. The obtained results show in which axes in the plane of the GaAs plate [100] the maximum magnetoelectric effect is observed. Graphs of the frequency dependence of the output signal and the dependence of the output signal on the angle of the GaAs plate plane are given [100]. The maximum voltage magnetoelectric coefficient is observed in the plane of the GaAs plate (11-1) and is α_ME = 17.41 V/(cm·Oe) at the frequency f_res = 479.6 kHz. The final part of the article discusses the prospects for the possible practical application of these magnetoelectric structures for energy sources.

The high strain rate deformation of metals and alloys, containing alloying elements is theoretically analyzed. An expression for the contribution of alloying elements to deforming stresses is obtained. Solid solution hardening of alloys increases linearly with increasing plastic deformation rate. The concentration dependence of the mechanical properties under high-strain-rate deformation differs essentially from the analogous dependence under quasi-static deformation. This difference is due to the action of collective dynamic effects. The concentration dependence of hardening under high-strain-rate deformation is determined by the competition between the interaction of the dislocation with alloying elements and dislocations of the ensemble. If interaction with alloying elements dominates, hardening increases in proportion to the square root of the concentration. If the collective interaction of dislocations predominates, the hardening increases linearly with increasing concentration.

This article presents the results of a study of the longitudinal and thickness modes in the field of electromechanical resonance in a magnetoelectric composite structure. Magnetoelectric structures of the composition Metglas/4H-SiC and Metglas/6H-SiC were theoretically explored. When obtaining theoretical results, the material parameters of the constituent phases of the composite structures were used. The calculated characteristics are compared for two different polytypes of silicon carbide 4H-SiC and 6H-SiC. It was found that the value of the resonance magnetoelectric coefficient in the Metglas/6H-SiC structure is higher than in the Metglas/4H-SiC structure for both the longitudinal and the thickness modes. The results obtained can be used in the future in the design of active semiconductor devices based on the ME effect.

A brief presentation of the relationship between a non-Gaussian family of stable laws and the self-similarity of the nonlocal processes described by them. The characteristic property of self-similarity makes it possible to arrange the ballistic, Brownian, and Levy-models of motion in a logically connected chain with characteristic exponents a = 1,2 and 0 < a < 2, which determine the degrees of differential operators describing these movements. The family of models generated by fractional values of a is characterized by a specific property of nonlocality, which is reflected in the physical interpretation in terms of fractality, if we are talking about the spatial derivative, and heredity, in the case of time-differentiation.

The article deals with the issues of the organization of scientific and methodological support for schools that consistently show downward trends in overall student performance in the course of the Unified State Examination. The basic principles of supporting schools with low-achieving students are described: interaction with the school management, hands-on training, implementation of new models in management activities and educational process. The article also reveals the components of scientific and methodological support technology, involving step-by-step development of education improvement programmes based on the management analysis, internship at schools with a positive learning outcome, post-course support after the implementation of the project in the school, etc. Particular attention is paid to the formation of psychological well-being in the team and its impact on the positive changes, including children with disabilities. The support programme is based on the study of the results of the GIA exam in grade 9 and 11 in Yaroslavl region for the past year, as well as the results of the survey "Effectiveness of the educational environment". The authors of the article conclude that school management can solve the problem more successfully if the professional development programmes that teachers undergo take into account individual characteristics of educational organizations, professional deficits in the school management and psychological well-being of students and teachers.