This paper presents a simulation of square bar extrusion using the finite element method in QForm software. The sequence of simulation stages is described and verified using an example of extruding AD31 alloy. The geometry of the extrusion tool (die) was improved to reduce material damage and eliminate profile distortion. It was found that rounding the corners and adding a calibrating section to the die provides improved performance. The analysis of metal heating from plastic deformation is also provided. The study highlights the importance of computer modeling for optimizing tools and increasing the efficiency of the metal forming process. Specifically, the initial and final die geometries were compared to assess the impact on product properties. Recommendations are provided for using simulation in the practice of developing metal forming process technologies. The benefits of using QForm software over alternative solutions are highlighted, including access to a comprehensive material database and robust technical support. The improved die design resulted in reduced plastic deformation and improved product quality. Finite element analysis significantly accelerates the development and testing of tools, providing the ability to develop optimal designs that account for various factors.

Keywords: extrusion, die design, finite element method, computer modeling, optimization, metal forming, aluminum alloy, process simulation

A study of heat transfer in porous heat exchangers with a sediment of dust particles was carried out. The influence of heat exchanger length and the presence of sediment on the Nusselt number was studied. It was revealed that increasing the length of the heat exchanger from 5 to 30 mm leads to an increase in the Nusselt number by 39.72-81.35% depending on the Reynolds number. The formation of sediment on the surface of the heat exchanger leads to a decrease in the Nusselt number by 2.8-6.6%.

Keywords: heat transfer, hydrodynamics, calculation, Nusselt number, Reynolds number, mathematical modeling, sediment formation, microelectronics, cooling systems, radiator

The article discusses the basic model of the formation of an emulsion layer on a rotating cylinder. Special attention is paid to the study of the influence of various parameters on the internal characteristics of the emulsion formation process. A mathematical description of the displacement layer is given and functional dependencies between the parameters characterizing the emulsion formation process are derived. Based on experimental data, the qualitative influence of "internal" and "external" factors on the formation of the emulsion layer has been studied. The result of the study were graphs, analyzing which the following conclusions can be drawn. An increase in the viscosity of the emulsion leads to a decrease in such parameters as the boundary of the fracture region of a more viscous liquid layer adjacent to the surface of the rotating cylinder, the viscosity of the emulsion in the transition layer, but there is an increase in the consumption of the emulsion. It is also established that the growth of the complex of "external" parameters leads to a decrease in all internal parameters during the formation of the emulsion. The research conducted in the article will help to take into account the obtained dependencies when calculating the operating and design parameters of devices.

Keywords: emulsion layer, viscosity, density, emulsion, rotating cylinder, liquid, emulsion composition

The paper is devoted to the application of a machine learning model with reinforcement for automating the planning of the deployment of logging sites in forestry. A method for optimizing the selection of cutting areas based on the algorithm of optimization of the Proximal Policy Optimization is proposed. An information system adapted for processing forest management data in a matrix form and working with geographic information systems has been developed. The experiments conducted demonstrate the ability to find rational options for the placement of cutting areas using the proposed method. The results obtained are promising for the use of intelligent systems in the forestry industry.

Keywords: reinforcement learning, deep learning, cutting areas location, forestry, artificial intelligence, planning optimization, clear-cutting

The article proposes an image recognition algorithm for an automated fiberglass defect inspection system using machine learning methods. Various types of neural network architectures are considered, such as models with a firing rate of neurons, a Hopfield network, a restricted Boltzmann machine, and convolutional neural networks. A convolutional neural network of the ResNet model was chosen for developing the algorithm. To develop the algorithm, a convolutional neural network of the ResNet model was selected. As a result of testing the program, the neural network worked correctly with a high learning percentage.

Keywords: fiberglass, defects, machine learning, convolutional neural networks, ResNet architecture, testing, accuracy

The desliming process plays a key role in mineral processing technology, ensuring efficient particle separation based on their magnetic properties. The article examines the issues arising from the use of traditional magnetic deslimers under elevated slurry temperatures. One of the main drawbacks of existing methods is the decrease in magnetite density as temperature rises, which impairs separation quality and leads to losses of the valuable product. The article explores the physical aspects of this problem and proposes methods for its mitigation, including control of the magnetic field strength to optimize flocculation. It also considers the possibility of upgrading deslimers by replacing permanent magnets with electromagnets, enabling more precise process control. Magnetic field modeling with ANSYS Maxwell software confirms the effectiveness of the proposed solutions. The work’s primary focus is the development of a hybrid intelligent control system for the desliming process. The proposed system consists of three control loops: water supply, electromagnet excitation current, and desliming discharge. Each loop is managed by proportional–integral–derivative regulators, which are automatically adjusted based on data regarding changing slurry parameters and external conditions. Applying these methods can significantly improve the quality of the iron ore concentrate, increase the iron content in the product, reduce losses in tailings, and ensure stable equipment operation under varying environmental conditions.

Keywords: magnetic desliming, flocculator, automated control system, PID controller, iron ore processing, optimal control

The article considers the possibility of integrating traditional folk crafts into modern design solutions using 3D modeling technology. Digital tools are being considered that make it possible to combine historical colors and modern forms. The possibility of using glass-like elements in the decoration of clothing and the role of cylindrical elements in modern design are described. The results of the created ornamental solutions in the Gzhel palette on 3D models of clothing are presented.

Keywords: digital tools, 3D models, visualization, glass beads, gzhel, design solutions, ornament, cultural heritage

The article discusses the process of formation of cavitation bubbles. One of the effective designs of regulating equipment is an axial type valve, for which a mathematical description of the process of formation of cavitation bubbles has been developed. This description allows you to evaluate the bubble structure depending on the main operating and design dimensions of the valve.

Keywords: valve, cavitation bubbles, probability, functions

The article considers the issues of risk management in the implementation of investment construction projects in the oil and gas industry. The author's classification of risks, methods for assessing project risks are presented and directions for reducing risks in the implementation of construction projects in the oil and gas industry are proposed. The author attempts to determine the importance of the risk of uncertainty in the implementation of oil and gas projects in the context of instability of economic and political factors.

Keywords: risk assessment, risk of uncertainty, project management, oil and gas industry, investment construction project

A transient non-linear coupled heat transfer problem with heat conductivity properties being dependent on moisture content has been studied for heterogeneous domain represented by a building exterior structure. Moisture content is considered as a variable parameter linked to material permeability and vapour transfer characteristics as well as amount of moist being condensed and evaporated. The solution to such problem has been obtained by using semi-analytical approach where the governing equations have been discretized by using finite element technique at the spatial domain, and analytically at temporal domain. Picard iteration method has been used for equation linearization. Based on a connection detail of three-layered exterior wall with floor slab, a sample problem has been solved. The results are compared with the results of similar but linear problem.

Keywords: non-linear transient problem, semi-analytical method, heat transfer, evaporation, condensation

The paper presents an analysis of existing issues in the subject area, upon which research findings are formed to enhance the quality of the tourist experience through the implementation of a software-mathematical complex aimed at generating personalized recommendations. The task of managing tourist resources is addressed by considering the decision support process through the introduction of multi-criteria optimization and fuzzy logic. Such mechanisms significantly improve the accuracy of forming personalized recommendations that meet individual user requests. As an individual algorithm, a method is proposed for introducing ontological hierarchical types of connections that capture generic and object-oriented relationships of tourism categories, characterizing the influence on tourist objects. In addition, to accommodate flexible, poorly formalized user requests, fuzzy logic mechanisms are introduced by implementing fuzzy evaluation scales. The paper presents a description of the implementation of the recommendation algorithm, which possesses scientific novelty and practical significance. A class diagram details the structure of the ontological hierarchical model presented in the work. Based on the provided research results, the effectiveness of the algorithm is tested through test calculations.

Keywords: tourism, tourism optimization, recommendation systems, fuzzy logic, multi-criteria optimization, mobile development

The development of a system for automatic generation of starter site templates to simplify the creation of web applications is being considered. Using code generation allows you to automate the process of writing repetitive code, reducing development time and increasing the efficiency of developers. The system provides a user-friendly interface for selecting and configuring templates, eliminating the need to work with console commands. This allows you to speed up the prototyping and deployment of web applications, which is especially important when creating projects with many repetitive components.

Keywords: website, content management, code generation, content management system, website template, web applications, framework, server side, client side, optimization

Spatially distributed automated information systems have become an integral part of modern organizations. They are used in various spheres, including medicine, energy, finance, communications and governance. The number of information security incidents is increasing every year. The purpose of this study is to increase the efficiency of measures taken to plan and implement responses to information security incidents. Analysis and synthesis of available publicly materials were applied as research methods. The results of analysis of modern spatially distributed automated information systems and specifics of information security incidents response are presented in the article. The examples of spatially distributed automated information systems that used in different countries around the world are presented. The models of work organization of support teams (response team), including centralized, follow-the-sun and hybrid are presented. The factors that should be taken into account when planning and implementing measures of information security incidents response are proposed: used model for organization the work of response team; number of used independent communication channels; recovery time objective; recovery point objective; limitations of the response area in automatic mode.

Keywords: response measure, response team, cyber attack, computer network, communication channel

The design and construction of underwater pipeline crossings is a complex multifactorial task. Unfortunately, the existing recommendations on the design of these facilities, aimed at ensuring the reliability of structures, are not confirmed in operational practice. For example, with the trench method of building a single-pipe double-stranded structure, the distance recommended in the regulatory and technical documentation between the main and backup pipelines is often insufficient with intense deformation of the channel, which leads to a loss of bearing capacity of both strands of the underwater passage. Modern trenchless pipeline laying methods can minimize the risks of emergency situations. However, a number of factors, such as the pumping of corrosive products, the construction of oil and gas pipelines in difficult natural conditions (permafrost, increased seismic activity) require additional measures to ensure the reliability of underwater crossings. Our proposed option is to replace the single–pipe structure in trenchless pipeline laying with a two-pipe one. The objective of the study was to influence the fillers of the inter-tube space on the structural reliability of the pipeline and the feasibility of using the pipe-in-pipe construction method.

Keywords: underwater pipeline passage, pipe-in-pipe construction, trenchless technologies, inter-tube space filler

In this article, the focus shifts to an in-depth study of the effect of bending deformation on the change in the refractive index of the optical fiber core. The developed module will allow analyzing trends in this indicator, which will provide a more detailed understanding of the internal processes occurring in the fiber under the influence of deformation.

Keywords: mathematical modeling, optical fiber, bending deformation, modeling of deformed fiber behavior, software

This paper discusses the Viola-Jones algorithm for face detection and its implementation based on the STM32 microcontroller. The advantages of using embedded systems in implementing personal identification systems are given: low cost due to the reduction of the element base and low power consumption. The architecture of the hardware and software system for face detection based on a multi-core microcontroller is proposed. The following requirements are put forward for the implemented facial recognition system: processing frequency of not less than 1 frame per second, output in color format, display of faces in the form of rectangular frames on the frame, refusal to use external memory modules. Cascades and features used in the classical version of the Viola-Jones algorithm are described. MB-LBP is chosen as a feature due to the efficiency of calculation and storage within low-power embedded systems due to integer single-byte results. The structure of files of trained OpenCV classifiers is described and methods for their compression and conversion for use in 32-bit systems with limited RAM and the absence of a floating-point unit are proposed. A method for optimizing an integral image using overflow calculations is described. A multicriterial optimization problem for selecting optimal parameters of an integral image is formulated and solved using the gradient descent method. The application of SIMD instructions for parallelizing the calculation of an integral image on the STM32 is described. The results of measuring the operating time of the implemented system at different stages are presented, which confirm that the previously stated requirements are met.

Keywords: face detection, microcontroller, embedded systems, Viola-Jones algorithm, MB-LBP features, classifier optimization, integral image optimization, SIMD instructions

The paper considers the choice of the optimal technology for the construction of tongue-and-groove fencing based on the hierarchy analysis method. Decision-making in construction practice requires consideration of many factors, including internal (cost, reliability, speed of work) and external local conditions (risk of interruptions in the supply of materials, the influence of weather conditions, work in cramped conditions). The hierarchy analysis method makes it possible to formalize the decision-making process by structuring the task in the form of a hierarchy and comparing alternatives in pairs. In the course of the study, a comparative analysis of the technologies of hammering, vibration immersion and static indentation of sheet piles was carried out. Priority vectors for each criterion were calculated, and the consistency of the matrices was checked. The final choice of technology is justified based on the integration of internal and external factors. The results obtained allow us to recommend the optimal technology that takes into account the technical and organizational features of the construction process.

Keywords: tongue-and-groove fencing, technology selection, hierarchy analysis method , selection criteria, construction technologies, pairwise comparison, priority vectors

The article presents a study of the hydrophysical properties of modified cement concretes, namely frost resistance and water resistance. The compositions of modified concretes for research are determined. It is established that the use of mineral fertilizer production waste in combination with the superplasticizer "Osnovit Safescreen SPP1" allows to increase the frost resistance, water resistance and strength of concrete composites.

Keywords: heavy concrete, hydrophysical properties, frost resistance, water resistance, strength, porosity, organomineral modifier, waste, plasticizer

In this paper, the problem of extrapolating a video signal with a quasi-rational spectral density, which significantly generalizes the rational density, is explicitly solved. The spectral characteristic of video signal extrapolation is constructed using the original method of A.M. Yaglom, a follower of academician A.N. Kolmogorov, who first posed the problem of extrapolation for random sequences and processes. The essence of the method consists in transferring all studies and calculations of spectral characteristics and densities from the real axis to the complex plane. The paper considers a video signal with a quasi-rational spectral density of a special type, interesting for practical applications, in which, as shown by the author using the Chebotarev and Sturm methods, it has all its roots only in an open upper half-plane.

Keywords: random process, video signal, prediction, filtering, spectral characteristic, prediction time

Experimental studies have been conducted in a hydroacoustic pool on the propagation of an amplitude-modulated signal of a complex shape for communication with underwater objects based on a parametric antenna. The parameters of the hydroacoustic pool are given, the modulation and demodulation modes of hydroacoustic signals are developed. The bit error rate is estimated for each measurement, it is proven that the experiment was carried out under strictly controlled parameters, namely, in the absence of currents, noise and reflections (hydroacoustic pool), the receiver is accurately installed and ideal synchronization of the signal is ensured. There were no unwanted phase and frequency deviations of the transmitted signal, as well as time delays between the transmitter and receiver.

Keywords: hydroacoustic, parametric antenna, communication, amplitude-modulated signal