Numerical methods for calculating shells provide a wide range of solutions when varying various parameters. The object of this study is a mathematical model of thin isotropic elastic shells of revolution of constant thickness. The problem is solved from the position of moment theory.To determine the stress-strain-state of the shell, the solving system is obtained by transforming the basic systems of equations of rotational shells by moment theory and the variables separation. All SSS and load components are decomposed into Fourier series along the circumferentail coordinate. A programme in the Python programming language was written to verify the numerical solution by a computer mathematics system (CMS-Maple 17). Matplotlib library was used for plotting graphs. Examples of numerical calculation of ring spherical shells for the action of ring loads are given. The variants of action of one and two ring loads on shells with different conditions of support along the contours and different half shell angles are presented. The difference between the calculation results of the two methods for bending moment functions and displacement functions is tabulated. The highest value of the difference is 0.0015%. Plots of the variation of meridional bending moment under the action of two ring loads are presented. The variants of rigid pinching along the contours and hinged support are considered. Exsmples are given for shells with the ratio of radius of curvature to shell thickness equal o R/h = 25, 50, 150, 200. Considered of the half shell angles equal to 90, 100, 130 degrees.

Keywords: rotation shell, spherical, isotropic, elastic, computer mathematics system, Python programming language

Automatic classification of electrocardiogram signals will allow providing timely medical care to patients when providing first aid. Neural network models of electrocardiogram signal classification, including the stage of preliminary signal processing, allow increasing the accuracy of classifying electrocardiograms into a particular category of arrhythmia. The paper presents a computational method for preliminary processing of electrocardiogram signals, including noise reduction using discrete wavelet transform and extraction of morphological features using frequency analysis methods. The results of modeling the classification of 12-channel electrocardiogram signals using the stage of their preliminary processing showed an increase in classification accuracy by 23.2% compared to classification without preliminary signal processing.

Keywords: electrocardiogram signal classification, long-term short-term memory neural network, metadata, signal preprocessing wavelet transform, spectral analysis, PhysioNet Computing in Cardiology Challenge 2021

The article shows the importance of the role of clinical engineering departments in ensuring high-quality comprehensive control of the state of medical equipment at all stages of its life cycle. The main resource of such departments is the resource of working time of clinical engineers. In order to rationalize the use of this resource, we analyzed data on the time budget for the maintenance of 2459 units of medical equipment in medical institutions of Volgograd. The results of the analysis allowed us to identify 3 subgroups of medical equipment in the general data array that have statistically significant differences in the time characteristics of their maintenance and require a different approach to managing the time of clinical engineers servicing them. At the final stage of this study, ABC-XYZ analysis was used. Its results allowed us to formulate recommendations for rationalizing the use of working time of clinical engineers to work with the subgroups of medical equipment identified in this study in practical conditions.

Keywords: clinical engineering, clinical engineer, time budget, maintenance of medical equipment

This article presents the results of simulation of the stress-strain state of the base under dies with a stepped shape of the bottom of the support. Numerical modeling was performed using Plaxis 2D. The results of modeling stamps with different angles of descent of steps with an equal surface area of ​ contact with the soil showed the dependence of stresses and displacements on this parameter.

Keywords: effective foundation, shallow foundation, columnar foundation, die with convex support surface, stepped sole, soil mechanics, settlement of foundations

The article considers modeling of nonlinear electrical conductivity of a biological cell using the equivalent circuit method. The paper proposes a nonlinear model of the electrical conductivity of a biological cell based on the use of nonlinear active and passive elements. The main mechanisms that determine the nonlinear nature of the electrical characteristics of a cell, including the phenomena of cell membrane polarization, are considered. To verify the model, a comparison of calculated and experimental data on the electrical parameters of biological cells is carried out. It is shown that the use of a nonlinear equivalent circuit allows more accurately reproducing the real behavior of cells in a wide range of applied voltages. The presented modeling technique can be applied to study the electrical properties of various types of biological cells, as well as to develop new electronic devices interacting with living systems. The article considers a complex nonlinear dependence of the electrical conductivity of a biological cell on voltage, which is caused by the interaction of two ion channels with different characteristics and resonance effects created by a series circuit. The method of equivalent circuits made it possible to create a single model that combines components responsible for ionic conductivity, capacitive properties of the membrane and resonance phenomena associated with the presence of electropores.

Keywords: mathematical modeling, equivalent circuit method, software, biological cell, computational research, electrical conductivity

The work is aimed at developing and testing an algorithm for choosing the location of a new cargo storage warehouse, taking into account stochastic flows of cargo supplies to the warehouse and to consumers from the warehouse. When choosing a warehouse location, the costs that accompany the activities of a logistics company related to the organization of warehousing in the selected location, with the maintenance of the warehouse, storage of cargo, delivery of cargo from suppliers to the warehouse and from the warehouse to consumers are taken into account. The paper proposes an algorithm for solving the problem of choosing the location of a cargo storage warehouse, taking into account the forecast of the dynamics of cargo deliveries to the warehouse and to consumers from the warehouse. A mathematical toolkit is described that allows estimating the dynamics of costs for the organization and operation of a warehouse in conditions of non-stationary flows of incoming and outgoing cargo from a warehouse based on the application of the statistical modeling method. The approbation was carried out. The proposed toolkit has a novelty in terms of accounting for non-stationary flows of incoming and outgoing cargo to the warehouse and real transport routes when choosing the location of the warehouse.

Keywords: warehouse location, dynamics of warehouse costs, statistical modeling, mathematical model, logistics

The laboratory base in higher educational institutions should be equipped with modern stands with equipment that corresponds to the technological level of the real equipment of industrial enterprises. Practical training of highly qualified engineering personnel in the field of industrial automation is one of the key factors in the technological development of the material production sectors of our economy. The formation of students' skills required by the real sectors of the economy is possible only during practical and laboratory classes using laboratory stands based on modern domestic equipment. The article discusses the issues of designing and constructing a mobile multifunctional laboratory stand for the industrial automation based on the programmable logic controller of the national production SPK110, provides a functional diagram and wiring diagram of the laboratory stand, provides a complete list of electrical components used to create the stand. The performed economic assessment of the manufacture of the laboratory stand gives grounds to conclude that it is economically feasible to produce such stands by the staff of the departments of industrial automation. The article also shows the experience of introducing this laboratory stand into the educational process of bachelor's degree preparation in the direction of 15.03.04 “Automation of technological processes and productions". The laboratory stand based on the SPK110 is a multifunctional, mobile stand designed to implement multi-level tasks of industrial automation, which can also be used as a visual aid when conducting career guidance and exhibition events in extracurricular premises. The project to create the laboratory stand can be scaled up in other higher educational institutions of our country without spending time on the preparatory and research parts.

Keywords: programmable logic controller, laboratory stand, industrial automation, automation of technological processes and productions

This article discusses the automation of metrological ensure at manufacturing enterprises and in metrological laboratories with a special focus on innovative technologies, including the introduction of enterprise resource planning systems (ERP systems) and the use of calibrator standards. The functioning of automated measuring systems that implement pre-established algorithms for control and testing measuring instruments is considered. An analysis of existing solutions on both the domestic and foreign markets was carried out. In particular, the focus is on a meter designed for testing integrated circuits. The possibility of integrating these measuring systems with software at various levels is discussed, as well as the prospects for their use in mass calibration of measuring instruments. The use of automated measuring systems can significantly speed up the calibration process, eliminating the need for manual voltage regulation and thereby minimizing the influence of the human factor on the accuracy of measurements. The adaptive capabilities of the software are discussed, which allows the system to be used for various types of measuring instruments, such as ammeters and ohmmeters. The findings confirm that automation of calibration processes not only significantly speeds up this operations, but also ensures strict adherence to all procedures, which helps improve the quality and reliability of the resulting measurements.

Keywords: Measuring systems, verification, calibration, measuring instruments, , automation, voltmeter, verification procedure

The article discusses the author's methodology for designing and developing a test data generation tool called "QA Data Source", which can later be used in software testing. The paper describes the basic requirements, application functionality, data model, and usage examples. When describing the application, methods of system analysis and modeling of information processes were used. As a result of the application of the proposed model for the implementation of information processes, it is possible to significantly reduce the time and resources for generating test data and subsequent product testing.

Keywords: quality assurance, software testing, test data, information technology, data generation, databases, application development

The article discusses the issues of modernization of the automated system for filling petroleum products (ASN). The complexity of maintenance of the automated control system due to the lack of up-to-date documentation and updated software, as well as periodic failures and high cost of spare parts became the main reasons for the implementation of modernization. Automatic control systems based on the law of proportional-integral-differential regulation have been developed: using a shut-off control valve with a positional actuator or a frequency converter to control the ACN. Mathematical models of the automatic control system have been developed in the MATLAB program using the Simulink library. An experimental model of a pumping station was assembled in laboratory conditions, and simulation modeling of the operation of an automated control system for a discharge and filling station was carried out. According to the results of experimental studies on the direct characteristics of assessing the quality of the transient process, the graph of a circuit with a frequency converter demonstrates the best results.

Keywords: automated pumping station, petroleum products, mathematical models, PID controller

Occupational safety is one of the important aspects of the organization of work in production. Domestic machines and units used in the food industry do not yet allow to exclude the impact of harmful and dangerous production factors, to make the work of employees safe. In this context, it is important to study active and passive methods of noise and vibration suppression, their effectiveness in ensuring normalized working conditions of workers on the example of a specific production. Existing research, as a rule, focuses on one criterion when choosing protection methods. However, an integrated approach is advisable in solving this problem. The purpose of this study was to choose a rational method of protecting personnel from the effects of noise and vibration based on the economic justification of effective technical solutions. The obtained research results make it possible to take into account the criteria for evaluating the validity and acceptability of choosing a particular protection method, including from the standpoint of technical and economic calculation, when designing a security system. The above study showed the expediency of import substitution in the food and beverage industry, as well as the correlation between the introduced protection systems and an increase in the level of safety. The given algorithm of the feasibility study has the properties of scale and generality. It can be successfully implemented when choosing methods of protection from the effects of other harmful production factors found in various industries.

Keywords: acoustic factor, protection methods, active and passive methods, economic justification, sound pressure levels, experimental data

The relevance of the study is justified by the growth of breaches in the field of information security, especially personal data on the global network. The study puts forward 2 hypotheses. The 1st - about the inverse relationship between the density of hacked accounts per 1000 people and the GCI and NCSI cybersecurity indices. At stage 1, this hypothesis was refuted. The 2nd hypothesis - about the existence of factors interacting with cybersecurity factors and affecting the leakage of personal data, was confirmed Then, data outliers were identified and excluded, the final sample was 149 countries. The identified factor was the GDP per capita indicator. After eliminating the influence of this factor, the correlation analysis confirmed the presence of an inverse relationship between the personal data leakage indicator in the form of the density indicator and the GCI and NCSI cybersecurity indices. The correlation coefficients were -0.43 and -0.48, respectively. The study suggested that there were problems with the completeness of the factors taken into account in the KB indicators and the reliability of the data received from governments, which requires further research.

Keywords: cyber breach, cybersecurity, GCI, NCSI, data leak, account hacking, personal data, sensitive information, data analysis, correlation

The use of small drones to detect urban targets such as vehicles at low altitude in cities has gradually become a mainstream means. In view of the existing problems of low detection accuracy of single-mode detection network caused by visible light detection, inability to work at night and blurred edge of infrared detection targets in actual scenes, In this paper, a multi-modal UAV detection algorithm based on image fusion and deep learning network is proposed. Firstly, based on DUT-VTUAV visible-infrared registration data set and TIF image fusion algorithm, multi-mode fusion data set is constructed. Secondly, by comparing the detection accuracy, speed and number of parameters of the existing YOLO series network, the lightweight network YOLO v5n which is most suitable for the mobile deployment of UAVS is selected. Finally, a multi-modal fusion detection algorithm is formed by combining image fusion algorithm and target detection model. Comparative experiments on vehicle data sets show that compared with single-mode detection, the detection accuracy of the proposed algorithm is effectively improved, with mAP up to 99.6%, and a set of visible-infrared image fusion detection can be completed within 0.3s, which has high real-time performance.

Keywords: target detection, YOLO, multimodal fusion, data fusion, TIF algorithm

In the conditions of dense urban development, the lack of parking spaces becomes a serious problem that requires a comprehensive approach to solve. It is the construction of new multi-level car parks that makes it possible to increase the number of parking spaces in a limited space. The foundation plays a critical role in the construction of multi-level car parks, as it must ensure the stability and safety of the entire structure. There are many aspects to consider when designing and constructing the foundation that help ensure the reliability and durability of the multi-level car park, which is especially important to prevent potential problems and accidents in the future. The article discusses in detail the technology of laying a pile-based foundation for the construction of a multi-storey car park located in Moscow.

Keywords: multi-level car park, rostver foundation, geodetic control, reinforced concrete beams, excavation pit

A programming method based on the ESC pattern is presented. The relevance of the work is due to the fact that the object-oriented approach is one of the most popular and sought-after ways to develop an information product due to a huge regularly updated selection of various methods, templates and ways of its implementation. The most significant of them is Entity System Component (ESC). This method of implementing OOP allows you to make the software product flexible and extensible. The ESC pattern is based on the reactive programming method and divides the entire code architecture into three components: entity, system, component. The tool package that implements the ESC pattern is the ESC DOTS package, designed for the Unity3D environment. The built-in Jobs System package provides the ability to work with multi-threaded programming in Unity. This package distributes threads created at runtime into groups of a certain type, which have a strictly limited execution time. Thus, the task of enumerating an array of several hundred elements goes into a Temp type thread, which runs for one frame in Unity, and the enumeration of a million polygons of the Unity landscape is placed in a Persistent type thread, which has an unlimited time limit.

Keywords: object-oriented programming, Unity framework, ESC pattern, multi-threaded programming, reactive programming, extensible architecture, package manager

In the article the urgency of development of requirements to rescue stations, carrying out safety of people on water οbjects of the Russian Federation (hereinafter referred to as RF) on οsnοve analysis of earlier scientific works is disclosed. The results of the development of the requirements are presented, which include: ο analyzing normative and legal documents, introducing a termοlοgicheskοy system for ο οnsuring the safety of people on water, classifying rescue stations, criteria for ο determining the number of rescue stations and rescue posts, as well as the requirements for workers, οmployees, οsupply, territory, buildings, and supplies. Conclusions are formulated that the existing legal framework, structure, The material and technical οsnο-technical οsnο systems of οsupport for people on water are not in accordance with the current requirements and οdetermined conditions for making radical decisions in οrganizational, technical, and legal οrganizational areas. As one of the measures for solving the problematic οprusοsο suggested ο the development and adoption of the standard “Ο rescue stations ο providing οnο rescue of people in οοbjects”, the realization of kοtοrοrοgο pοluidο will substantially increase the level of οnοsupport in οnοbjects.

Keywords: safety, rescue station, rescue station, rescue post, rescue service, rescue service, inοdnο-rescue fοrmirο, on-duty rescue unit in aquatοrium, rescue zone, patrolling aquatοrium, pοiskοvο-rescue service, rescuer in aquatοrium