The direct numerical simulation (DNS) is an effective and useful tool in the two-phase fluid flow studying. The projection method on the staggered grid was applied in this paper to solve the incompressible Navier-Stokes equations in irregular domains at the pore-scale level (irregular boundary is presented by its level-set function). The permeability of porous medium which was constructed by the random positioning of penetrable spheres of equal radii were numerically calculated and validated by comparing with theoretical estimations of permeability based on the numerical solution of the lattice-Boltzmann equation in irregular domains in previous works. All numerical calculations were performed using PARIS simulator.

In this literature review, the work of electrochemical sensors based on rhenium was considered. The research work of the rhenium-based sensors was compared with each other and a table was compiled.The ways of synthesis of rhenium-based working electrodes for the manufacture of electrochemical and biological sensors are determined. It was found that the methods of thermal, microwave-thermal oxidation, ultrasound, magnetron sputtering, and bi-exponential decomposition were widely used for the synthesis of rhenium-based sensors. The main parameters of the rhenium-based sensors were compared with respect to the selected analyte: detection limit, linear range, response time, sensitivity, etc. As a result of the reviewed scientific papers, it was assumed that the reason for choosing rhenium as an important element in rhenium-based sensors was high sensitivity, high melting point (above 3000 ^oC), fast response and low losses. It was found that rhenium-based sensors were used to detect aromatic organic compounds, histamine, DNA, oxygen, ions, carcinoembryonic antigen, solar yolk, heat flux, and tumor biomarker. This paper provides a summary of the current aspects of research work on rhenium-based electrochemical sensors.

This article analyzes the methods and models suitable for studying the icing of the aerodynamic surface (wing). Systems to counteract the unifying effect are considered. Methods and models for calculating ice formations on aerodynamic surfaces are studied. Further study of the effect of icing will be conducted in the light of the characteristics of flow around bodies of viscous compressible medium in terms of load and liquid phase in case of changes in the geometric parameters of the bodies and reflect this change in the external stream.

Scientific work is devoted to the development and improvement of new high-speed structures with artificial roughness, connecting the upper and lower beams of hydraulic structures. The main purpose of these hydraulic structures is not to allow water to flow downstream, flowing at high speeds in mountainous areas of our southern regions and to create a safe hydraulic regime in open canals. In this case, the excess kinetic energy of the falling water from the top of the water is necessary to soak for a relatively short distance and time with the help of specially developed fast currents with artificial flow. In our research, the main attention is paid to the economy, durability and reliability, simplicity of construction, rationality and simplicity in the implementation of the form, etc. We assume that the design of the fast current with a positive solution obtained in the utility model, with account of the circumstances, corresponds to the requirements to it.

Nowadays, the usage of mobile phones reached extremely large worldwide proportions and increasing dramatically, there is a stronger need to decrypt the important information that is hidden among them. Even all needed information is gained, the processes of companies remain static and can’t be changed dynamically to adapt to actual business needs, reducing the advantages that can be achieved. Every second, millions of raw information are generating by mobile users, which are handled by Telecom operators in data servers. By using the Complex Event Processing (CEP) approach in real-time, we can obtain the information that matters to our business and use it to monetize the vast amount of data that is being collected through mobile phone usage. In this paper, we present an internally developed framework that combines the strengths of CEP and business process implementations, which allows us to react to the needs of today’s fast-changing environment and requirements. We demonstrate 3 simple use case scenarios to show the effectiveness of the CEP approach in our situation. The importance of implementing the CEP approach on subscribers’ data should not be overlooked as means of trying to capitalize on new services but have to be considered as a challenge to allow subscribers get more customized offers and services.

The article is devoted to the development of a system of biometric identification of a person by face, fingerprints and voice. Two-dimensional and three-dimensional characteristics of a person's face, taking into account area and volume, were used as informative signs of biometric identification of a person by face. A complex identification algorithm has been developed to account for such phenomena as portrait shift, different photo scales, and the tilt of the identified face. The FPM10A scanner and the Arduino microcontroller are used for biometric identification of a person by fingerprints.

Identification signs are based on the analysis of the structure of papillary patterns on the finger: type and type of papillary pattern; direction and steepness of streams of papillary lines; the structure of the central pattern of the pattern; delta structure; the number of papillary lines between the center and the delta and many other signs. Another type of feature is local. They are also called minutiae (features or special points) — unique features inherent only in a particular print, determining the points of change in the structure of papillary lines (end, split, break, etc.), the orientation of papillary lines and coordinates at these points. Each print can contain up to 70 or more minutations.

For biometric identification of a person by voice, MFC and PLP algorithms for digital processing and analysis of audio recordings are used. Various algorithms are used for acoustic speech analysis: hidden Markov models, a model of a mixture of Gaussian distributions. The result of determining the tone of speech and the content of speech for the purposes of voice identification is obtained.

The Visual FoxPro DBMS has developed a «multiparametric automated system for biometric identification of an individual».

This article presents the results obtained by numerical modeling of the spread of pollutants formed during the combustion of fuel at an electric thermal power plant and their chemical reaction in the atmosphere. On the example of a real thermal power plant (Ekibastuz SDPP-1), the dispersion of NO and the product of NO₂ was modeled during a chemical reaction with oxygen. A notable feature of this thermal power plant is that the difference between the chimneys makes it possible to study the influence of the height of the source on the dispersion of pollution. To describe this process, the Navier - Stokes equations were used, consisting of the equation of continuity and motion. To check the mathematical model and the numerical algorithm, test problems were solved numerically. The aim of this work was to study the level of pollution concentration at different distances from the source. As a result, the mass fractions of concentration and product were determined. According to the data obtained, with increasing distance from the source, the concentration of pollution spreads more widely under the influence of diffusion. The further the distance from the pipe, the lower the concentration of the substance. As a result of a numerical study, the data obtained can be used for further studies of the problems associated with the spread of pollutants into the atmosphere for real atmospheric conditions, and can also allow in the future to predict the optimal distance from residential areas for the construction of thermal power plants, at which the concentration of emissions will remain at a safe level.

It was known that any non-single-element (in particular, any infinite) family of total functions with an oracle A, such that Ø′≤_TA, does not have A-computable principal numbering; later it was proved that any finite family of total functions with a hyperimmune-free oracle A always has an A-computable principal numbering. The unresolved question was whether there exists an infinite family of total functions with a hyperimmune-free oracle A that has an A-computable principal numbering. The paper gives a positive answer to this question: it is proved that there exists an infinite A-computable family F of total functions, where the Turing degree of the set A is hyperimmune-free, such that F has an A-computable principal numbering.

High parallel efficiency for various large-scale tasks requires that the computational load is evenly distributed among all computational processors. This study presents a dynamic load balancing scheme that improves the performance of complex coupled simulations with non-trivial domain expansions. In addition, the high scaling experiment results show that the benefit of load balancing is proportional to the degree of parallelism.

In this work described method of fault detection of induction motors. Induction motors are broadly utilized in numerous mechanical applications. Subsequently, it is exceptionally imperative to monitor and detect any faults during their operation in arrange to alarm the administrators so that potential issues can be avoided before they happen. In common, a fault within the acceptance motor causes it to induce hot amid its operation. This paper presents a developed protection method algorithm that uses unbalanced power components and simulates the overall design based on the Matlab Simulink. Three-phase voltage and current data are observed first, followed by signs of unbalanced power, according to the digital relay safety algorithm. The relay then uses a negative sequence reactive power sign to decide if the fault is internal or external. A negative sign for negative sequence reactive power indicates a fault inside the motor, while a positive sign indicates a fault outside the motor.

We consider relational databases organized over an ordered domain with some additional relations – a typical example is the ordered domain of rational numbers together with the operation of addition. In the focus of our study are the first-order (FO) queries that are invariant under order-preserving permutations – such queries are called order-generic. It was discovered that for some domains order-generic FO queries fail to express more than pure order queries. Here we prove the collapse result theorem over an almost omegacategorical weakly o-minimal domain having convexity rank 1.

This article discusses the management of the automated system of the oil pumping station and the monitoring of malfunctions of their technical indicators. The basic mathematical formulas for the safe transportation and supply of oil are also considered. Controlling the main actions of the system using a logic controller is considered one of the main roles in the oil industry. It was concluded that the formation of an optimal operating mode in the automated control system of the oil pumping station units, as well as the minimization of malfunctions, will reduce economic costs.

Recently, a lot of attention has been paid to smart network applications based on multi -agents. A multi-agent system is a set of units (entities) of software or physical devices that are placed in a certain environment in which they can exchange information with each other and interact in a certain way with the environment. At the same time, the components of a multi-agent system have the following properties: they are Autonomous, run on a decentralized basis, and can only receive information from a limited part of the environment. Micro grid networks are a typical example of a system in which multi-agent systems can be effectively applied. This paper presents the application of a multi-agent system in a micro grid. In addition, concepts, multi-agent system architectures, and a comprehensive overview of various aspects of micro grid management will be considered, which are generally classified into four management strategies: centralized, decentralized, distributed, and hierarchical.

The maturity method is an approach to concrete quality control that predicts the in-situ strength based on internal temperature. It is known that the cement hydration process takes place during the hardening of concrete. This process causes the cement to become waterlogged, due to which energy is released. Temperature and moisture are then the main characteristics to control the strength of concrete. The degree of maturity depends on the changing curing conditions by measuring and recording the internal temperature of the concrete using special sensors and registers embedded in the concrete at the time of placement. This approach is now widely used all over the world. There are, however, other methods of calculation regulated in the standards of other countries. The following article is devoted to the analysis of existing methods of temperature and strength control of concrete. A list of normative documents regulating these requirements is given in the article, the features, advantages and disadvantages are discussed. Also the authors justify the necessity of formation of the unified approach to temperature-strength control of concrete.