For the possibility of installing overhead cranes, steel columns of an industrial building are made in steps, with the allocation of crane and crane parts. The basis of the upper and lower parts of the column are steel I-beams with a mismatch of the central axes. As part of the work, variant modeling (using CAD) of a steel column that is part of the U-shaped frames of industrial buildings, consisting of crane and crane parts, was carried out. Various solutions for the difference of the central axes of the crane and crane parts of the column in the model are proposed. The results of static calculation of column elements are obtained. A comparison of the results obtained is made, an analysis of the optimal method of modeling column elements for structural schemes is performed. Based on the calculations performed and the analysis of the results obtained, conclusions are drawn.

Keywords: industrial building, I-beam, finite element method, stress-strain state, node, rod, circuit

The service life of shut-off valves operated at sites of hazardous production facilities with ultra-high parameters of the working environment is largely limited by the wear resistance of contact surfaces. In this regard, to increase the durability of contact surfaces, technological methods are used to modify the surface and special functional coatings are used. The development and selection of new functional coatings are inextricably linked with their comparative study based on the determination of the most significant characteristics through testing. The purpose of this work is an analytical review of the most common test methods for evaluating the characteristics of multicomponent nanocomposite coatings applied to the contact surfaces of valves to increase their wear resistance. Based on the results of the analytical review, recommendations are given for testing multicomponent nanocomposite coatings.

Keywords: pipeline fittings, functional coatings, test methods, service life, wear, friction, hardness, corrosion, tribology

The paper considers the types and classification of industrial PID controllers according to various types and groups. A group of linear controllers has been identified, which includes PID controllers, which are most widely used in various technical devices. Some well-known software systems that provide calculations for PID controllers are given. The transition from the mathematical notation of the trapezoidal expansion of the transfer function of the PID controller, used in the PID Tune option of the Matlab environment, to the equivalent transfer function, represented by the symbolic coefficients of the numerator and denominator polynomials, is shown. A theorem is proved that shows a one-to-one correspondence between the parameters P, I, D of the controller and the coefficients of the resulting transfer function. Flowcharts of algorithms for calculating transfer function coefficients (TF) from known values of controller parameters and calculating transfer function coefficients from known values of controller parameters are given. An illustrative example is considered.

Keywords: PID controller, transfer function, block diagram of the algorithm, Matlab environment

This paper considers the modern classification methods of breast cancer histopathology. The main purpose of the study is to conduct an extended test of the trained model on data that fundamentally differs from the training dataset. We chose a large Russian dataset with different types of classification as the training dataset. The dataset contains images with different resolutions and magnifications. As testing data, the same dataset was used, but the resolution, color balance, brightness, and contrast of the images were changed. The classes in the dataset were unbalanced, so we applied augmentation methods (flipping and rotation). The models ResNet 152, DenseNet 121, Inception_resnet_v2 were selected for training. The transfer learning approach was used for training. The preprocessing of images consisted of normalizing the values of all image channels in the range from 0 to 1. The models had good results with standard testing methods. The resolution change slightly reduced metrics. The change in color balance, brightness, and contrast significantly reduced all metrics. The test results show that elementary normalization is not enough for high-quality training of models resistant to changes in input data.

Keywords: neural network, model, machine learning, breast cancer, cancer classification, artificial intelligence, transfer learning, histopathology

The flow that occurs during the movement of an elevator cabin in the shaft of a high-rise building from the -4th to the 58th floor is considered. The moving elevator cabin works like a piston and pushes air in front of it out of the shaft and draws air into the shaft behind it. This effect is especially significant in high-rise buildings, which are characterized by a high speed of elevator cabins movement. The STAR-CCM+ software was used as a research method. To simulate the non-stationary problem of the elevator cabin movement, the technology of sliding meshes was used. It was found that when the elevator cabin moved at a speed of 7 m/s, the maximum pressure drops formed on the surfaces of the elevator shaft amounted to 130 Pa. It was found that the maximum flow rate of air entering the elevator shaft and from the elevator shaft into the hall due to the piston effect is about 250 m3/h. This value is comparable to the flow rates formed due to natural movement of air in the elevator shaft caused by stack effect in winter and cannot be automatically excluded from consideration.

Keywords: high-rise building, numerical simulation, piston effect, stack effect, elevator shaft

Concrete and reinforced concrete recycling is a system of mechanical processing of waste concrete and reinforced concrete with the aim of obtaining raw materials for secondary use, i.e. resource renewal and returning construction waste to the economic cycle. In order to reduce costs for new construction, preserve natural resources, and land areas that could be used for new landfills, it is necessary to use recycled concrete and reinforced concrete as secondary crushed stone and sand-gravel mixture. At present, the economic necessity has arisen for the development of modern domestic equipment for processing concrete waste. Foreign manufacturers of crushing equipment from unfriendly countries are leaving Russia, which gives an impetus to the active development of this industry in our country, as well as to the emergence of new relationships with companies from countries that previously did not have access to our market.

Keywords: Keywords: recycling, reinforced concrete, secondary crushed stone, construction waste, crushing equipment.

Building materials are classical composites with heterogeneous and multiphase structure. Components are introduced into their composition - industrial waste. Based on the author's developments, the modification of fine-grained concrete with mineral additives based on industrial waste from the Lower Volga region as hardening activators and fillers of concrete compositions leads to an increase in compressive strength. Fine-grained concrete modified by industrial waste components (construction composition) will be widely used due to its architectural and construction properties, increased physical and mechanical characteristics, versatility and an affordable raw material base in the Lower Volga region, which is economically and environmentally justified. It is concluded that fine-grained concrete modified by industrial waste components (construction composition) is promising at all stages of construction of buildings and structures.

Keywords: electronic payment system, distributed registry technology, decentralized electronic payment system, digital money, national digital currency

The main maintenance of a diversification of production as activity of subjects of managing is considered. being shown in purchase of the operating enterprises, the organizations of the new enterprises, redistribution of investments in interests of the organization and development of new production on available floor spaces. The most important organizational economic targets of a diversification of management are presented by innovative activity of the industrial enterprise.

Keywords: management, traffic, traffic flows, pedestrian flows, technology, design, interchanges, control method, numerical model, simulation

The life cycle of a capital construction facility is an economically feasible program for the design, construction, operation and abandonment of a building or structure. This article reveals the role of the life cycle project in the redevelopment of industrial facilities, such as above-ground plants and factories within the city and mining facilities. The article provides a methodology for drawing up a life cycle program for redevelopment of industrial (above-ground and underground) objects, a mine field.

Keywords: life cycle, redevelopment program, underground facilities, modeling, information construction, industrial facility, mine workings, mining facility

As part of Sol-Iletsky Mine No. 2, it is planned to erect and set up a health resort center for the treatment of respiratory diseases. This health center will provide medical services in the therapeutic salt chambers on the first horizon (123 meters underground). For this purpose, it is necessary to use the waste horizons of rock salt (chamber workings). For the construction of the health-improving complex for safety reasons in part of underground workings, it is required to arrange a fortification. This article deals with mathematical modeling and selection of the optimal type of support for chamber workings.

Keywords: mathematical modeling, stress-strain state, SSS, rock salt, roof support, chamber workings, finite element method, FEM, redevelopment

A review of the problem of accounting for random factors in the scheduling of construction projects is considered. The problems of taking into account random factors in construction scheduling have been considered in works. However, these studies have not paid full attention to the course of construction for large projects. At the same time, scheduling problems are closely related to optimization of working hours and resource allocation in construction production. Such tasks are usually solved by considering several variants of the technological sequence of works, and the typology and variability of random factors are not fully taken into account. A number of researchers have the view that the determining factor in estimating the actual duration of construction is the reliability of suppliers and delivery of construction products. However, it is not possible to ensure the construction process in reality without interruptions in work. The main reason for this is random factors. It is suggested to take them into account on the basis of modern information technologies including artificial intelligence, stochastic approaches, probability theory and mathematical statistics.

Keywords: Construction organisation, random factors, organisational expectations, calendar modelling, stochastic search, genetic algorithms

The article deals with the problems of communication between the customer and the development team in the process of designing information systems. Based on the identified shortcomings of existing solutions, a conclusion is made about the need to develop a new approach and means of its implementation. The paper sets the task of developing a common model for the interaction of subjects using a single platform. The article describes the concept and modular architecture of the platform for implementing the system notation for designing architectural schemes. The modules of such a platform and its general functionality are considered.

Keywords: information system, life cycle, developer, end user, architectural scheme, basic abstraction, subject area, systems design

Liquid pumping processes which require flow variations over a wide range are often equipped with centrifugal pumps connected in parallel. In such pumping systems, speed control enables the required capacity to be achieved with different numbers of pump units running and the selected speed values. The information required for modeling such systems, such as wastewater treatment and various cooling and water supply tasks, can be scarce, and the lack of real-time monitoring of operating points often sets limitations for precise optimization of energy efficiency. Consequently, easily implementable control strategies that can be adopted with minimal system data are needed, requiring adaptive methods. A significant part of pumping stations operate in conditions when the flow rate and the required pressure vary widely, which can lead to a decrease in the efficiency of their management and, as a consequence, a decrease in energy efficiency. Therefore, it should be noted that the task of choosing the optimal strategy for controlling pumping units during their parallel operation is very relevant.

Keywords: pumping units, energy efficiency, modeling, rotation speed, speed control

The purpose of this article is to consider the concept of "polymer concrete", its classification, features of its use, role in modern construction and the likelihood of replacing traditional building materials. Also studied and structured theoretical material on the topic "concrete based on polymer binders", classification of polymer concrete according to V.V. Paturaev ,practical experience of its application. The possibility of using polymer concrete in modern realities and in the future is considered. General conclusions are made about the expediency of its widespread use from a practical and economic point of view.

Keywords: polymer concretes, polymer, binder, filler, reinforcement, resins, thermosetting, thermoplasticity , thermoplastic substances, thermosetes, polymer concrete (PO)

The tasks of preparing for the modernization of the automatic pressure control system with the transition from the use of a PD controller in favor of a PID controller and the introduction of a controlled electric fan drive in a boiler plant are being solved. A technique for constructing a fan model in the automatic control system for air supply to the boiler is given using the example of a VD-18 blower fan and a BKZ-160 boiler. The block diagram of the operation of the fan and pipeline is given. A mathematical model of the fan is shown, a calculation is made and a computer model is designed in MATLAB Simulink. The simulation results are presented, which prove the correctness of the obtained model. The presented model can serve as a basis for automating the air supply system in other boilers using blowers.

Keywords: automatic pressure control system, automatic control system, dynamic model, computer model, blower fan, boiler plant