This paper proposes a mathematical model of the laminar flow of a truly viscous lubricant in the clearance of a radial plain bearing with a nonstandard support profile. The influence of a fluoroplastic-containing polymer coating and a groove on the shaft surface is considered, taking into account nonlinear effects, which improves the accuracy of the description of hydrodynamic processes. Thin-film approximations and continuity equations are used to determine the hydrodynamic pressure, load capacity, and friction coefficient. A comparison with existing calculation models demonstrated improved performance prediction. The results demonstrate the feasibility of ensuring stable shaft floatation, confirming the applicability of the developed model for engineering calculations of bearings with a polymer coating and a groove.

Keywords: radial plain bearing, mathematical modeling, true viscous lubricant, polymer composite coating, hydrodynamic regime, tribotechnical characteristics

This article presents a practical approach to the design of precast concrete frame buildings based on a developed methodology for accounting for the flexibility of joints between floor and roof elements, using a plate-and-rod model of a floor fragment. For two types of braced frames (with symmetrical and asymmetrical stiffener arrangements), an analysis of quantitative indicators of deformability and relative forces is presented, with reduction factors applied to the integral rigidity of the precast floor in its plane, obtained using the proposed methodology. This analysis compares this approach to the classical approach to designing precast frames, taking into account the rigidity of monolithic floors. The results of the calculation of frames using the proposed method show that with a decrease in the rigidity of the floors (reducing to equivalent rigidity, taking into account the flexibility of the seams in the joints of the floors), the vertical forces in the columns from horizontal loads decrease, and the moments in the stiffening diaphragms increase, that is, in the frame structures, both reserves and deficiencies in the bearing capacity can be identified, which is especially important during the inspection and subsequent reconstruction of buildings with the structural system under consideration.

Keywords: multi-story frame structural system, precast floor, flexibility, horizontal load, joint, rod model, equivalent stiffness coefficient

The article focuses on the development of a web portal for monitoring and forecasting atmospheric air quality in the Khabarovsk Territory. The study analyzes existing solutions in the field of environmental monitoring, identifying their key shortcomings, such as the lack of real-time data, limited functionality, and outdated interfaces. The authors propose a modern solution based on the Python/Django and PostgreSQL technology stack, which enables the collection, processing, and visualization of air quality sensor data. Special attention is given to the implementation of harmful gas concentration forecasting using a recurrent neural network, as well as the creation of an intuitive user interface with an interactive map based on OpenStreetMap. The article provides a detailed description of the system architecture, including the backend, database, and frontend implementation, along with the methods used to ensure performance and security. The result of this work is a functional web portal that provides up-to-date information on atmospheric air conditions, forecast data, and user-friendly visualization tools. The developed solution demonstrates high efficiency and can be scaled for use in other regions.

Keywords: environmental monitoring, air quality, web portal, forecasting, Django, Python, PostgreSQL, neural networks, OpenStreetMap

The article presents the compositions and technology of preparation of fine-grained concrete using modifying additives and superplasticizers. It is proposed to use waste from thermal power plants in the form of carbon black as a modifying additive. Depending on the amount of soot, parameters of the mobility of the mixture and indicators of compressive and flexural strength were determined. The optimal consumption of soot waste in the amount of 1.0% of the binder weight was established, at which the maximum parameters of the mobility of the mixture and the strength of fine-grained concrete were obtained. The complex effect of soot waste and super-plasticizer on the change in the physical and mechanical properties of concrete is considered. The combined use of soot and a plasticizing additive in a 1:1 ratio contributed to an increase in the mobility and tensile strength of the hardened fine-grained concrete during compression and flexural stress. The method of electromagnetic activation in a linear induction rotator was used to prepare dry mixtures.

Keywords: fine-grained concretes, soot waste, superplasticizer, electromechanical reinforcement, mobility, strength

The article describes the experience in the field of practice-oriented and career-oriented activities aimed at modernizing modern engineering education, taking into account an interdisciplinary approach. An example of training an engineer of a new formation based on school engineering classes is given. Attention is paid to project activities that can involve students in both creative and production projects. The issues of "career guidance filtering" necessary for selecting the necessary professional qualities of students through a cycle of mini introductory and training cases are highlighted. The emphasis is placed on the contact and information access of parents and schoolchildren to the university's research sector.

Keywords: management of engineering education, project activities, engineering classes, priority 2030, career guidance activities

This paper is devoted to the construction of a visual-inertial odometry system for an unmanned vehicle using both binocular cameras and inertial sensors as an information source, which would be able to simultaneously determine the vehicle's own position and the relative position of other road users. To ensure accurate and continuous localization, it is proposed to use an inertial navigation system and two types of image keypoints. Deep learning models are used to accurately and reliably track keypoints. To achieve efficient and reliable matching of objects between two frames, a multi-level data association mechanism is proposed that takes into account possible errors of various system components. The experimental results demonstrate the feasibility and application potential of the proposed system.

Keywords: multi-object visual-inertial odometry, localization, data association, tracking of 3D dynamic objects

This article presents the results of a study on the composition of decorative concrete that exhibits luminescence at night and architectural expressiveness in daylight, while maintaining enhanced physical and mechanical properties. The feasibility of producing decorative concrete using container and construction glass waste in combination with photoluminescent additives is demonstrated.

Keywords: concrete, decorative concrete, luminescent concrete, cullet, photoluminescent additives, plasticizing additive

This article evaluates various methods for determining the technical condition of structures, buildings and structures. To date, probabilistic (statistical) methods are considered to be one of the possible options for determining the degree of destruction of building structures. The advantage of these methods is the ability to comprehensively take into account the parameters present in a variety of material nature. This is due to the possibility of describing them in dimensionless quantities. The purpose of the method under consideration is to formulate a certain number of technical conditions (events) through which it is planned to determine the degree of destruction and find a set of technical conditions of building structures. Diagnostic matrices are created by combining diagnostic features and their conditional probabilities, acquired by analyzing a large amount of accumulated statistical data.

Keywords: construction and technical expertise, defects, reliability, diagnostic methods, efficiency

This paper is devoted to the construction of a robust visual-inertial odometry system for an unmanned vehicle using binocular cameras and inertial sensors as information sources.The system is based on a modified structure of the VINS-FUSION system. Two types of feature points and matching methods are used to better balance the quantity and quality of tracking points. To filter out incorrect matches of key points, it is proposed to use several different methods. Semantic and geometric information are combined to quickly remove dynamic objects. Keypoints of static objects are used to complement the tracking points. A multi-layer optimization mechanism is proposed to fully utilize all point matchings and improve the accuracy of motion estimation. The experimental results demonstrate the effectiveness of the system.

Keywords: robust visual-inertial odometry, localization, road scene, multi-level optimization mechanism

The purpose of the article: to determine the possibility of using file hash analysis using artificial neural networks to detect exploits in files. Research method: the search for exploits in files is carried out based on the analysis of Windows registry file hashes obtained by two hashing algorithms SHA-256 and SHA-512, using three types of artificial neural networks (direct propagation, recurrent, convolutional). The obtained result: the use of artificial neural networks in file hash analysis allows us to identify exploits or malicious records in files; the performance (accuracy) of artificial neural networks of direct propagation and with recurrent architecture are comparable to each other and are much more productive than convolutional neural networks; the longer the length of the file hash, the more reliably it is to identify an exploit in the file

Keywords: malware, exploit, neural networks, hashing, modeling

This article analyzes the specifics of applying certain circular economy principles in the construction industry. It examines the generation and management of construction waste. The main sources and types of construction waste are identified, including their classification by hazard level. It is determined that, due to its scale and the diversity of materials consumed, the construction industry has the greatest potential for waste utilization.

Keywords: construction industry, сlosed-loop economy, construction waste, waste recycling, waste disposal, circular economy

The article discusses the revitalization of industrial facilities of the elevator type, the current experience of restoration, renovation, reconstruction, and adaptation of such facilities to the modern needs of the urban environment. The article focuses on developing a theoretical model for the revitalization of former industrial facilities using the example of the Nevskaya Mlina flour mill in St. Petersburg. The article analyzes the architectural and spatial features, the potential for urban planning integration, and the functional reorientation of the facility. The principles of functional flexibility, architectural continuity, preservation of place memory, adaptive design, and sustainable urban integration became the basis for developing a theoretical model of revitalization for the Nevskaya Melnits flour mill. The practical result of solving the problem of transforming the flour mill in St. Petersburg is the versatility of its approach and the possibility of applying the proposed method to develop adaptation programs for other similar industrial facilities of the elevator type. 

Keywords: revitalization of industrial areas, renovation of flour mills, adaptation of industrial facilities, reconstruction of silos, elevator with silos towers

The article describes the stages of formation of architectural and construction solutions of the opera house from the concept stage to design solutions. The process is considered on the example of designing an opera house in one of the northern republics of the Russian Federation. The variability and differences of preliminary projects at different stages are considered taking into account acoustic comfort at the stage of development of architectural and design solutions of the object. The mutual influence and dependence of architectural, design and acoustic solutions of the theater and the need for their parallel consideration at the early stages of design are demonstrated.

Keywords: concert halls, opera houses, architectural and construction solutions, acoustics, architecture, acoustic characteristics, auditoriums, architectural and construction structures

A vectorial diffraction model is presented for the focusing of a Gaussian laser beam with a wavelength of 800 nm by a parabolic metallic mirror with a diameter of 15 mm and a focal length of 150 mm. The model is based on a rigorous calculation of the reflected electromagnetic field using s- and p-polarization basis functions, complex Fresnel coefficients, and the Kirchhoff–Rayleigh surface integral. The reflective coating is characterized by a complex refractive index n = 0.145 + 4.5i, corresponding to silver in the near-infrared spectral range. The incident beam has a waist radius of 3 mm at the mirror’s vertex plane. The field distribution in the focal plane is numerically computed on a 300×300 grid over a ±30 μm region. Focus quality is evaluated using three criteria: total intensity, radial intensity distribution, and the full width at half maximum (FWHM) of the focal spot. A focal spot with FWHM ≈ 8.56 μm is obtained, in close agreement with the theoretical diffraction-limited estimate. The results demonstrate that accounting for the vectorial nature of the field and the dissipative properties of the metal enables accurate prediction of polarization distortions and energy losses in practical mirror-based focusing systems.

Keywords: vectorial diffraction model, parabolic metallic mirror, Gaussian laser beam, Fresnel coefficients, complex refractive index

The article considers the issues of studying the wind regime of the territory of residential areas. The results of modeling a city microdistrict and wind flows in it using the multifunctional software package Ansys Discovery Live are presented. The analysis of the wind regime of the territory with different volumes of development from the point of view of the comfort of a person in it is carried out, comfortable and uncomfortable aeration zones are determined. The comparison was made for a residential complex consisting of four groups of houses with their courtyards, with a southern direction of the incoming wind flow. An assessment of the influence of the surrounding development on the wind situation is given. The use of computer modeling of the wind regime of residential development is relevant at present, since information on the nature of the movement of air flows helps to improve the comfort of cities for the population.

Keywords: wind regime, urban development, residential development, urban development, numerical modeling, Ansys Discovery Live, ventilation, wind comfort, aeration regime, aeration