The influence of the ratio of fly ash and blast furnace slag in a geopolymer binder on the properties of concrete hardening during heat and humidity treatment was studied. The article obtained data on the influence of the binder composition on the workability of the concrete mixture, the strength and shrinkage of concrete. The dependences of the influence of hardening temperature and the proportion of slag in the binder on the strength of geopolymer concrete were established. The results obtained made it possible to recommend the studied binder and concrete based on it for pilot industrial production of prefabricated reinforced concrete.

Keywords: geopolymer binder, fly ash, blast furnace slag, concrete, strength, workability, water absorption, shrinkage

This article reveals a number of examples of the features of the construction of the base of a gravity offshore platform used for the extraction of hydrocarbons. The design of the reinforced concrete base of the platform in the form of a "monopod" consisting of 8 lower cylindrical tanks and a vertical reinforced concrete support with a length of 95 m is considered. Reinforcement of the entire structure was carried out by pre-tensioning reinforcement ropes on the hardened concrete in height by mechanical means. During the construction of the gravity foundation, new compositions of heavy high-strength modified concretes with the use of microsilicon and nanocarbon additives were used. During the construction process, adjustable formwork was used along the entire height of the structure.

Keywords: gravity platform base, monopod, pre-tension on concrete, high-strength modified concrete, towing, positioning

The article is devoted to the issues of optimizing the process of technical inspection of buildings and structures damaged as a result of emergency situations, using the most modern information systems and technologies. The difficulty in carrying out work on the inspection of buildings damaged as a result of natural and man-made emergencies necessitates the search for effective organizational and technological solutions in order to reduce the time required to carry out work on the inspection of buildings and structures without losing the quality and accuracy of the studies, as well as to create safe working conditions for specialists during work.

Keywords: technical inspection, emergency situation, digital building model, ground penetrating radar sensing, information technology, geographic information technology

The world's reserves of renewable energy sources are steadily declining, but the comfort of life in modern society should remain at the same level. The modern solution of the problems of thermal protection of facade systems of buildings is associated with the analysis of the specific heat capacity of the materials included in their composition. The use of new energy-efficient materials is becoming especially relevant. Such materials include vacuum thermal insulation panels, which significantly reduce heat loss in comparison with traditional thermal insulation.

Keywords: energy efficiency of buildings, thermal protection of facade systems, thermal insulation, vacuum thermal insulation panels, construction production

The article formulates a functional-spatial “portrait” of a home in gardening for Novosibirsk and Rostov-on-Don, and establishes a trend in the construction of houses with an expanded set of functional zones. Scientifically based structural models of housing have been developed based on the dominant function (profile) of the house; work, rest and health improvement, cultural and family leisure, and options for combining them in the structure of one house and plot. Volume-spatial solutions for the distribution of the dominant function of housing in the structure of the house and on the site in the conditions of the existing development, regional characteristics, type of residence (recreational and permanent) for Rostov-on-Don and Novosibirsk are proposed.

Keywords: housing, dacha architecture, gardening infrastructure, structural models of housing, volumetric-spatial solutions, functional models of housing, recreational living, garden house, Siberian dacha, southern dacha

In this article, a computer simulation of the movement of passengers on escalators was carried out, taking into account different (four) scenarios for organizing the movement of passengers, the intensity of passenger flow, and also analyzes the influence of social distance on the speed of ascent. The dependences of the change in the time spent by passengers on covering the path from the center of the platform to the moment of ascending the corresponding escalator were constructed. The results of the study make it possible to identify differences in the efficiency and comfort of passenger movement depending on the chosen layout and load. These findings can be useful for optimizing the operation of public transport and metro systems, providing safer and more comfortable travel for passengers in various conditions.

Keywords: analysis of human flows, ensuring safety in the metro, organizing human flows, computer modeling, optimization of passenger flow

Diseases of the cardiovascular system are the main cause of death in the world. The main way to diagnose diseases of the cardiovascular system is to take an electrocardiogram of the patient. Automatic processing of electrocardiogram signals will allow doctors to quickly identify heart problems in a patient. This article presents a method for calculating the detail vector for neural network processing of a twelve-channel electrocardiogram signal. Adding a detail vector to the electrocardiogram signals improves the classification accuracy to 87.50%. The proposed method can be used to automatically classify two or more channel electrocardiogram signals.

Keywords: electrocardiogram, recurrent neural network, neural network with long-term short memory, detailing vector, PhysioNet Computing in Cardiology Challenge 2021

For the design, construction and monitoring of railway infrastructure facilities, as well as for the maintenance of track facilities, it is necessary to have a spatial database relevant at the time of their production, which should be provided with a continuous survey of infrastructure facilities located in the right-of-way. The article considers the possibilities of introducing geoinformation technologies, including high-precision methods of coordinate-time support, mobile laser scanning, into the production processes of design, construction, operation, repair and diagnostics of railway infrastructure. The existing problems of the widespread introduction of mobile laser scanning technology in relation to the shooting of railway objects are shown.

Keywords: geoinformation technologies, high-precision coordinate system of JSC "Russian Railways", mobile laser scanning, geodetic support

The article proposes a method for determining the optimal location of a self-supporting fiber-optic cable laid along the supports of high-voltage power transmission lines. The methodology is focused on the use of both a manual calculation method and with the use of electronic computing equipment.

Keywords: fiber-optic communication line, electric field, induced voltage potential, electrothermal degradation, optimization of placement of self-supporting fiber-optic cable

Research subject. The influence of the intensity of the light source and the direction of its beam on the process of object recognition by machine vision sensors - visible spectrum cameras and light detection and ranging systems (LiDAR) has been studied. Factors such as the intensity of light, its trajectory and the angle of the beam relative to the horizon are taken into account. Method. The solution to the problem of analyzing the ability of machine vision sensors to recognize the ArUco marker under conditions of various levels of illumination is based on empirical research methods. The main results. During the recognition of objects by a machine vision camera at a high level of illumination, a distortion of the light flux on the camera matrix occurred. Bugs in the operation of LiDAR were also found. Practical significance. Obtaining research results was used to develop a means of assessing a high level of assessment of a high degree of probability of detecting objects of sensory vision.

Keywords: machine vision, LiDAR, influence of light, empirical study

The current trend of complication of the modes of operation of the traction power supply system, an increase in the amount of damage from events leading to downtime of trains, the need to improve operational efficiency, actualizes the task of using monitoring systems. The features of the traction power supply system determine the requirements for the organization of monitoring parameters in real time. One of the main requirements is to ensure the autonomous operation of monitoring devices (systems) for a given period of time. Using the example of monitoring the process of ice formation on a contact network, taking into account the specifics of disturbing environmental influences, the basic principles of building a monitoring system, the structure of technical means, a multi-mode algorithm of functioning, a method for calculating the parameters of a power source are proposed.

Keywords: power supply system, contact network, monitoring, ice detection, automation

The problem of atmospheric air pollution by dust particles, along with the formation of greenhouse gases, covers many countries of the world. To monitor the state of atmospheric air, expensive and cumbersome monitoring stations are traditionally used, for which state organizations are responsible. The use of inexpensive sensor particle sensors that will allow real-time measurements at the border of the sanitary protection zone of industrial enterprises and on the territory of the residential zone opens up new prospects in the field of atmospheric air research. Currently, about 10 thousand inexpensive sensors operate on the territory of 75 countries of the world, which causes the involvement of citizens in the collection of data on the state of atmospheric air. The presented technology for monitoring the concentration of fine particulate matter can replace the traditional measurement method, but the question remains of the value of the data obtained in terms of their accuracy. This article discusses the factor influencing the deviation of the readings of the inexpensive Nova SDS011 solid particle sensor. To do this, the sensor was tested in real environmental conditions, experimental dependences of the concentration of dust particles of no more than 2.5 micrometers depending on humidity were obtained.

Keywords: atmospheric air, PM2.5, Nova SDS011 sensor, dust particle concentration, monitoring stations, relative humidity

This article proposes a method for correcting the intermediate trajectory obtained by one of the planning methods, taking into account the limitations on the linear velocity and acceleration of the apparatus, as well as on the angle of its pitch. This technique is combined with the smoothing procedure, which includes the stage of minimizing the length of a piecewise polyline trajectory and rounding the corners at the vertices with the construction of a smooth time parametric representation of it using the modified Dubins method.

Keywords: robotics complex, unmanned aerial vehicle, stability and controllability of the vehicle, motion planning, local adjustment of the planned trajectory, reduction of energy costs

The issues of high-quality and reliable water purification for medical needs are considered. The cleaning process is inextricably linked with the automated control of engineering systems. Water for medical purposes places high demands on the degree of filtration. In this regard, the task is formulated to ensure continuous automated monitoring and control of the cleaning process. The paper shows an algorithm for controlling the process of preliminary water purification. Based on the algorithm, a program was written in the ST language, which describes the logic of the visualization with the function of displaying and controlling the process. A fragment of the functional diagram of preliminary filtering is given. A visualization of the filter washing process is presented.

Keywords: maximum level, minimum level, backup filter, storage tank, pre-cleaning, technological equipment, visualization algorithm, functional diagram, alarm, filter washing

Digital twins of railway stations are necessary for planning work and taking the most effective management actions. An important factor is the compliance of the planned time costs with the actual ones. One of the tasks that are difficult to formalize at railway stations is the process of holding the rolling stock. This is due to the fact that the holding time depends on the human factor and the holding rolling stock. To create an automated station controlled by a digital twin, it is necessary to develop an automated holding system. One of the tasks in developing such a system is the problem of device location. This problem can be formulated as follows: it is necessary to place the minimum allowable number of holding devices in the controlled area in such a way that reliable holding is provided for any configuration of the rolling stock. As a tool for solving this problem, the most effective will be the use of methods of genetic algorithms. In this article, the authors consider the relevance of this study and the relevance of automating the holding of rolling stock.

Keywords: digital railway station, automation, brake shoes, UTS-380, DUZS, traffic safety.

In the work, a method was implemented that allowed estimating the parameters of a control object based on the objective function, the least squares method, and the solution to the system of nonlinear equations was the Levenberg-Marquardt method. The numerical and laboratory experiments carried out allow us to speak about the effectiveness of the proposed method.

Keywords: identification, optimization, least squares method, Levenberg-Marquardt method, differential equation

This paper discusses the Vue, Svelte, Solid and Lit frameworks used to create the View part of client web applications. Their design, the proposed approach to developing client applications, the problems they solve and create, their strengths and weaknesses, as well as their features and limitations in application are studied.

Keywords: Vue, Svelte, Solid, Lit, Web Components, view frameworks, client web applications, front end, rendering

The article deals with the problem of inaccurate allocation of the boundaries of ore pieces after an explosion in a quarry in the photo. In this article, the possibility of using neural networks for segmentation of photographs was investigated, and training, testing and comparison of the pre-trained bases of neural networks were carried out. The family of pre-irradiated bases EfficientNet and SEResNet was tested on the FPN neural network. Neural networks were tested on the same number of learning epochs, and competitively on three, five, seven and ten learning epochs. Training for more than ten epochs was impractical, since almost all networks were undergoing retraining. According to the results of the test and comparison, the result was obtained that the FPN neural network on the pre-trained EfficientNetB2 bases after 7 epochs of training has a segmentation quality of 98.93% in three segmentation classes and 55.1% in the "ore pieces" class.

Keywords: segmentation, neural network, pre-trained foundation, EfficientNet, SEResNet

The problem of ensuring trouble-free operation of field pipelines is becoming more and more urgent from year to year. The development of deposits in areas with difficult natural and climatic conditions (the Far North, Western Siberia) requires a new approach to improving the reliability of pipeline systems. Along with the search for new technologies in construction and operation, the use of modern composite materials in the production of pipes is a primary task. Analysis of the causes of failures of field pipelines in the permafrost zone allowed us to identify the main ones: corrosion, water hammer, loss of stability as a result of frost heaving of soils. Comparative calculations of steel and fiberglass pipelines allow us to recommend the latter as an alternative to metal pipelines, because they have better corrosion and abrasive resistance, low roughness and thermal conductivity, high ductility and manufacturability.

Keywords: field pipeline, fiberglass, analysis, reliability, permafrost, corrosion, water hammer, loss of stable position, frost heaving