Two capacitive methods of measuring the linear density of one-dimensional fibrous products are considered. The sensitivity of the measurement results to variations in the geometric and physical parameters of the measuring device for the differential and resonance measurement methods is estimated. A weak, almost linear dependence of the measurement error on parameter variations in a wide variation range is established. The good suitability of both methods for measuring the linear density of one-dimensional products by the capacitive method and the high correlation between the measured value and the measurement results are substantiated.

Keywords: fibrous materials, one-dimensional products, linear density, capacitive measurement method, capacitive method, differential circuit, resonant measurement circuit, parameter variations

The paper considers the plane motion of a heavy material point in a quasi-static medium under the influence of gravity, aerodynamic forces and thrust forces. This problem can be considered as a continuation of Zhukovsky's problem of modeling the longitudinal flight of an aircraft, assuming that the angle of attack is constant, taking into account the effect of thrust. The equations of motion in different coordinate systems are obtained. Stationary flight modes have been found. The stability of the most basic modes is investigated. A numerical solution of the equations of motion is found and the behavior of trajectories in various flight modes is investigated.

Keywords: thrust force, material point, Zhukovsky's problem

For the development of automated systems for designing ultraviolet irradiators intended to compensate for the deficiency of natural ultraviolet, it is critically important to know the spatial distribution of the erythemal radiation power. However, there are no suitable sensors for direct measurement of this value on the Russian market. In this regard, an alternative method for determining the erythemal radiation power is considered, which does not require the use of specialized erythemal-sensitive receivers. The method is based on obtaining the spatial distribution of the erythemal radiation power by taking into account the curve of the relative spectral erythemal efficiency of radiation and preliminary measurements on a gonioradiometric setup of the distribution of energy illuminance in the UVA (320 - 400 nm), UVB (280 - 320 nm) regions and the relative spectral distribution of the irradiator or radiation source for one arbitrarily selected direction in the wavelength range of 280 - 400 nm.

Keywords: ultraviolet radiation; erythemal radiation; irradiation units; measurement method, radiation strength; spatial distribution of erythemal radiation strength, method

The paper considers the issue of using a computer vision system to control the quality of products in the control algorithm of a mechatronic sorting station. Shoe products are chosen as an example. The developed system is based on machine learning methods for image recognition by segmentation. As a result, a neural network model was created, and a program was written for identifying and selecting objects using a camera for subsequent sorting of defective products. The program contains three modules: initialization for declaring all variables, models, classes, video stream from the camera; the main module, containing an internal loop for each segmented object; a subroutine for completing the work. The introduction of computer vision into the control algorithm increases the efficiency and flexibility of the quality control system, and improves the accuracy of measuring the parameters of objects for their subsequent sorting.

Keywords: mechatronic station, sorting, computer vision, image segmentation, neural network training, control algorithm

This paper presents the results of an investigation into the adhesion properties of release coatings based on polyisobutylene applied to metallic substrates. A software tool was developed in Microsoft Visual Studio using the C++ programming language to compute the composition and effective technological parameters for forming coatings that ensure optimal adhesion to protected surfaces. As a case study, the method of calculating the relationships between composition, temperature, and formation time is demonstrated for coatings achieving the highest adhesion, corresponding to a score of “zero” on the standardized six-point cross-cut adhesion test. It is shown that the application of the developed software enables parameter evaluation within 1–2 seconds. The computational results are experimentally validated. The morphology of the coatings was examined using optical microscopy. It was observed that no delamination occurs at the intersection points of cuts or within the grid pattern.

Keywords: coating, adhesion, microstructure, cross-cut test, polyisobutylene, optimization

During the research, a new prestressing system was developed for carbon fiber reinforced polymer plates to reinforce damaged steel beams. A parametric analysis was performed using finite element modeling. The results showed that satisfactory amplification efficiency can be achieved using the new pre-voltage system. The prestressed carbon fiber significantly increased the performance when bending beams at the elastic and elastic-plastic stages due to the use of high-strength carbon fiber plates. In addition, as the pre-voltage level increased, the amplification efficiency increased. A simple increase in the area or modulus of elasticity of the carbon fiber plate slightly improved the hardening efficiency, while the simultaneous application of prestressing clearly increases the hardening efficiency.

Keywords: reinforcement, steel beam, prestressing, new system, carbon fiber plate

The article focuses on methods for reducing high inductance in power supply circuits using one of the IC substrate topologies with a high-speed interface as an example. The interface in question operates at a speed of 28.25 Gbit/s and imposes strict requirements on the parameters of the power supply inductance. The presented solutions are aimed at ensuring low values ​​of power supply inductance in conditions of high layout density and power integrity requirements for modern data transfer interfaces.

Keywords: power supply inductor, power system, low noise power supply, power supply impedance, analog power supply, serial interface, high speed interface, organic substrate, IC packaging

The paper proposes a method for calculating the area of a flat area from a photograph based on the use of mathematical analysis methods. To calculate the area, a curved integral of the second kind is used along a closed contour bounding the area under consideration. Defining the boundary in the form of a Bezier spline reduces the calculation of a curved integral to the calculation of several definite integrals from the Bernstein basis polynomials. An explicit form is obtained for integrals of Bernstein basis polynomials. For a third-order Bezier spline, a formula is derived for calculating the area of the area in terms of the coordinates of the reference points of the Bezier curves.

Keywords: cubic spline, Bernstein basis polynomials. Bezier curve, Bezier spline, Green's formula, beta function, gamma function

This article examines the use of a dual-circuit closed-loop system for pulsation combustion of solid fuel in agricultural services. The results of research on gas self-oscillations during wood waste combustion in a Helmholtz resonator-type installation are presented. It has been established that with certain geometric characteristics of the installation, a significant sound pressure level (up to 165 dB) can be achieved in the combustion chamber while maintaining a low noise level (up to 65 dB), which contributes to increased combustion efficiency and meets environmental requirements. Potential applications of this technology are proposed, including agricultural waste utilization, drying of agricultural products, and heating of greenhouse complexes and livestock facilities.

Keywords: Pulsation combustion, Helmholtz resonator, solid fuel, agricultural waste, energy efficiency, biomass utilization, agro-industrial complex.

The paper presents a review of the causes of phase shift formation in differential communication lines. A zigzag tracing method with an angle of 12° is proposed to compensate for the inhomogeneity of the glass fabric. A method for calculating the formation of skew in the length of conductors at turns with and without rounding is presented.

Keywords: differential pair, differential communication lines, signal phase shift, static skew, dynamic skew, delay, back drilling, non-uniformity effect, fiberglass weave, layout

The results of a study of induction wireless charging methods for batteries of unmanned aerial vehicles (UAVs) are presented. An experimental simulation of energy transfer using inductive coupling has been carried out. The main factors influencing the efficiency of the system are determined: the distance between the coils, the accuracy of their alignment, and heat losses. It is shown that energy losses with increasing distance reach 45%, and when the coils are shifted by 3 cm, the transmission efficiency decreases by more than 45%. Recommendations have been developed to improve efficiency, including optimizing coil materials, increasing the frequency of energy transmission, automating coil alignment, and introducing active cooling. The results obtained form the basis for further improvement of UAV wireless charging systems.

Keywords: wireless energy transmission, induction methods, resonant induction, unmanned aerial vehicles, optimization of charging systems

This article presents a conceptual model of the reconstructive solution of an industrial enterprise in the structure of a large industrial unit in the engineering industry. Based on the multifactorial analysis of the enterprise, a model was proposed that ensures the compliance of the reconstructed production environment with the updated requirements for industrial facilities located in the structure of dense urban buildings.

Keywords: industrial buildings, reconstruction of industrial buildings, architecture of industrial buildings, aesthetics of industrial buildings, conceptual models of industrial buildings

The architecture of a multi-agent system defines the basic principles of its formation and operation, including the format of the organizational structure representing a graph in which agents act as vertices, and the links between them are designated by edges. A common drawback of existing approaches to representing the architectures of multi-agent systems is the support of no more than two types of organizational structures, among which the optimal one for the given environmental parameters may be absent. This paper proposes a method for representing the architecture of a multi-agent system, implemented by borrowing the mechanisms of living nature, namely the principles of organizing animal communities. The proposed approach allows modeling organizational structures of the following types: "coalition", "team", "hierarchical structure", "federation", "congregation". To determine the optimal architecture of a multi-agent system, optimal for specific environmental conditions, it is possible to use a "genetic algorithm".

Keywords: multi-agent system, architecture, agent, organizational structure, optimization

The methods and approaches to reduce the wear of bearings and blades of electric generators are analyzed to increase the service life of the equipment, improve its reliability and efficiency. An analysis of the factors affecting wear is given, including mechanical, temperature and operational loads. Calculations are performed confirming the effectiveness of using modern materials, improved lubrication systems and optimized process modes. It is shown that the comprehensive implementation of the proposed solutions can significantly reduce the wear rate, reduce maintenance and repair costs, and ensure stable generator performance. The recommendations presented can serve as a basis for upgrading existing equipment and designing new power plants.

Keywords: building structures, metal structures, energy facilities, stress-strain state, technical expertise

This paper explores the development and application of a neuro-inspired automated system for greenhouse microclimate control. The relevance of the topic stems from the need to improve the resilience of agricultural production in the context of population growth and climate change. The proposed system architecture includes a hierarchical sensor network based on STM32 microcontrollers, an analysis module implemented on a Raspberry Pi 5 with neural network-based data processing, and a distributed actuator layer. The paper describes telemetry processing methods, device addressing and polling algorithms, as well as neural network models (YOLO and EfficientNetB3) used for plant disease diagnostics. An experimental evaluation of the classification model demonstrated high accuracy and confirmed the system’s capability for real-time operation.

Keywords: greenhouse automation, microclimate, neural network analysis, STM32, Raspberry Pi, deep learning, YOLO, EfficientNet, IoT, plant disease classification

The design of medical facilities requires careful coordination between different disciplines, especially when developing the section ""Technological Solutions"" (TS), which describes functional processes, equipment layout and compliance with sanitary standards. A common problem in this process is the lack of ready-made 3D families for specialized medical equipment in BIM systems such as Autodesk Revit. The purpose of this study is to develop an algorithm for creating equipment families based on a single image, which will eliminate time and resource constraints during manual modeling. To achieve this goal, the study examined modern design methods for TS and MEP sections, analyzed existing tools for creating families, and tested five neural network-based web applications capable of generating 3D models from 2D images. The proposed algorithm includes creating a 3D model based on images using artificial intelligence web tools, preprocessing the model in Autodesk 3ds Max, and importing the final geometry into a Revit family template. The algorithm was tested on a real example, an anaesthetic gas supply system, demonstrating the feasibility and effectiveness of the approach. Hyper 3D Rodin has been rated as the most effective tool for generation. The study concludes that integrating artificial intelligence into BIM workflows can significantly streamline the development of unique equipment families, reducing manual labor and improving project coordination.

Keywords: Revit family of equipment, medical equipment, neural network generation, 3D geometry of equipment, BIM, technological solutions

The paper proposes the development of a proprietary solution to increase the accuracy and completeness of vulnerability detection in the client part of Android applications. During the work, the main current threats to Android applications were identified. The dynamic analysis method was chosen as the main method of application research, which allows for testing the security of an application during its operation, thereby simulating the actions of an attacker. A vulnerability scanner for the client part of Android applications was developed, which was based on both dynamic and static analysis. The results of a full test of the developed software are presented, during which various security problems were detected. The developed software can be implemented in the organization's secure software development lifecycle processes to enhance the integrity, confidentiality, and accessibility of user data.

Keywords: android app security, dynamic analysis, static analysis, vulnerability detection, security scanner