Abstract: armor plates made of armored steel or combined armor plates made of hard ceramic material and an aramid or polyethylene substrate are used to provide Br4 and Br5 levels of protection according to GOST 34286-2017 “Armored clothing. Classification and general technical requirements.” The most promising armor plates are those that include a ceramic layer and an aramid substrate. Steel armor plates are currently the most common in the Russian army, however, their heavy weight is a significant drawback. This paper describes the selection of composite structures and the manufacture of their prototypes for ballistic purposes. The paper also presents the results of the ballistic tests.

Keywords: ceramic composite armor panel, Br4 level of protection, Br5 level of protection, armor protection, ballistic protection, aramid fabric

The physicochemical properties of cobalt catalysts on a NaX zeolite support have been studied. The parameters of the specific surface area, reduction of deposited cobalt, and structural properties of the active component of catalytic systems have been determined. To establish these properties, the methods of BET, TPR, TPD-H2, IR spectroscopy were used. It is shown that the preparation procedure has a significant effect on the physicochemical characteristics of the samples.

Keywords: catalysts, cobalt, zeolite, dispersion, specific surface area of the active component

In recent years, municipal solid waste management in developed countries has been based on the principle of recycling and reusing secondary products. The overseas level of sorting and disposal of waste is higher and more detailed, it refers to a higher economic level, cultural level of quality of life, government investment, appropriate policies and the construction of related auxiliary facilities. This article discusses some of the systems and methods for sorting municipal solid waste in order to justify the need to develop a system for object recognition when sorting waste.

Keywords: municipal solid waste, waste sorting problems, waste preparation for sorting, technologies for automatic waste sorting

More than 42 thousand bridges on highways are operated in Russia. Most of the bridge park was built in the past years. Bridges are getting old, accumulating destruction and defects and gradually cease to meet the requirements for safety, durability and load capacity imposed on them. It is necessary to spend a lot of effort and money on maintaining a stable working condition of all operated bridges. The use of modern surveillance tools will save financial and time resources. Such means of monitoring and collecting information can be unmanned aerial vehicles: various types and designs of quadrocopters and drones. A quadrocopter inspection of one of the city's overpasses showed high efficiency and quality of the information received. Based on the data obtained, it is possible to judge the technical condition of the object. Of course, the particularly dangerous defects identified during the inspection should subsequently be examined by a specialist to make a final decision. The article presents the photographic materials obtained by the modern method of data collection, the advantages of using quadrocopters in the survey of bridges and the technical characteristics of the equipment.

Keywords: operation of structures, inspection, bridge structures, quadrocopters, drones, defects, destruction,bridge bed

The aim of the study is to study the features of planning construction production when performing facade work. The theoretical analysis of information and the method of expert assessments were used as research methods. As a result of the study, conclusions were drawn about the factors affecting planning and technical and economic indicators. The analysis of issues related to the planning of construction production and the analysis of the conditions for organizing facade works is carried out. The main issues in this case are the issues of analysis of the initial data, the issues of the choice of means of paving and the selection of the numerical-qualification composition of workers.

Keywords: facade work, construction scaffolds, organizational and technological solutions, technical and economic indicators of work performance, a group of influencing factors, work parameters

Construction work creates a lot of dust and has a significant impact on the air quality in the surrounding area. This article presents the results of studies conducted by foreign and Russian authors to assess the risk of exposure to fine dust from a construction site. The urgency of protecting a person from fine dust and the problems associated with its effect on the human body are shown. The issues of concentration of dust, which are the most dangerous for human health, are considered. Measures are proposed to reduce the impact of RM on humans.

Keywords: Fine dust, PM10, PM2.5, environmental protection, human health, construction, mortality, risk, cardiovascular system, harmful factor, labor, protection

This article provides information that there are different categories of users with different groups of behavioral features. All this data is separated from each other. In the course of this work, it was found that if all data on user models are combined into one method, then the analysis by which information about a virtual person is obtained can lead to improved adaptability of web resources using new technologies.

Keywords: usability, virtual reality, types of virtual personalities, segmentation, socialization, user, Internet

This article proposes the development of a method for transmitting secure messages using a combination of best practices for organizing data exchange and cryptographic instant messaging protocols using end-to-end encryption. It considers ways of organizing an application using a peer-to-peer network and client-server architecture. It analyzes popular instant messaging protocols using end-to-end encryption. The software components of the application based on the developed method are described.

Keywords: messenger, end-to-end encryption, cryptographic protocol, instant messaging, peer-to-peer network, client-server

The paper is devoted to cellular automaton modeling based on the class of cellular automata with the Margolus neighborhood. A simulation of the kinetics of gas emission in the final volume of coal, including: convection, diffusion, sorption, is performed. To organize this kind of evolutionary process, the cell-automaton modeling method was supplemented with the Monte Carlo method.

Keywords: cellular automaton, Margolus neighborhood, Monte Carlo method, diffusion, convection, sorption, porous medium, coal

This article proposes the development of a method for fixing changes in the galvanic skin response and human pulse, depending on the viewing of a video fragment, which presumably causes a certain emotional reaction of a person. The creation of a prototype device on the Arduino Leonardo platform and compatible with this platform sensors for fixing galvanic skin response and a human pulse sensor is described, with the help of which data is collected for further use in determining the emotional state of a person.

Keywords: galvanic skin reaction, pulse, emotional state, arduino, emotion

This article discusses the need for modernization of existing thermal power plants (TPPs) in Moscow. The profitable aspects of technical re-equipment are considered, as well as the factors affecting the composition and implementation of investment projects for the development of existing thermal power plants in the capital are studied.

Keywords: thermal power plant, modernization, technical re-equipment, hazardous production facility, technical condition assessment, major repairs, investment project, service life, construction and installation works, technological equipment

The article describes the developed design of a sample of joining solid wood elements on SHERPA plates, which made it possible to simulate the operation of nodal junctions of the main and secondary wooden beams for frame buildings and structures. A procedure for testing specimens by loading in steps with periodic unloading has been compiled and tested on three test specimens. The tests of the approved sample of the joint were carried out, its maximum bearing capacity was established, as well as the load corresponding to the upper boundary of the elastic work area (VGOUR) of the joint. The graphs of dependencies were built: "Load - total deformation Dp", "Load - permanent deformation Dо", "Load - elastic deformation Dу", "Elastic deformation Dу - residual deformation per cycle dо". The deformations of the joint were determined within the limits of the bearing capacity of the sample, the calculated bearing capacity of the joint and the coefficient of transition from glued wood to solid wood.

Keywords: solid wood, SHERPA metal strips, test of a specimen of a joint of wooden elements, load-bearing capacity of the joint, deformability of the joint, upper limit of the elastic work area of the joint, total deformation, permanent deformation

Creep is a slow plastic (irreversible) deformation of a product under the action of stress created in the material. This article discusses the creep of polymer products. The creep of a material is characterized by the experimental dependence of the deformation resulting from a fixed load on time.

Keywords: material deformation, elastic deformation, highly elastic deformation, polymers, viscous deformation, plastic deformation

The presented article describes the modeling of a communication system (hereinafter SS) organized by a plurality of communication nodes of a public communication network (hereinafter SS SSN) and its elements. The task of modeling is to obtain interrelated initial data on the set of features for each investigated SS of the SSNS at each moment of the model time, taking into account the implemented activation processes and the logic of SS functioning. The process of functioning with the SS as a source of features is studied using a complex analytical and simulation model, since deterministic and random factors are taken into account for its development. The manifestation of signs is a complex process, since the SS is constantly in dynamics. However, the increasing intensity of the increase in the use of communication means and the load in communication channels leads to an increase in the number of manifested set of signs. The reasons for the manifestation of many signs are such factors as: dynamics of movement of the USS of the SSOP; modes of operation of SSOP elements, etc. All of these factors are used in the model as activating the manifestation of many features.

Keywords: communication system, public communication network, communication node, sign of a system element, information direction, activating factor

At present, the number of means for collecting information about the characteristics of elements of a public communication system is increasing. Databases.

Keywords: database, monitoring systems, information, resolution, processing of information arrays, similarity rate, process automation, public communication system, communication system elements