This article is devoted to the study of the characteristics of fine dust particles in the gym. The monitoring of the dust content of the sports premises with fine particles was carried out, and the dispersed composition of the settled dust was also studied. The regularity of the dust distribution in the room depending on the measurement height is analyzed. The analysis of the state of the system of external respiratory organs is carried out.

Keywords: monitoring, gym, dispersion analysis, fine particles, respiratory organs, PM2. 5, PM10, dust factor

This article is devoted to the study of the dust factor in the residential premises of a student dormitory during repair work, including the assessment of the regularities of the distribution of solid suspended particles by equivalent diameters (PM0.5, PM1, PM2.5, PM5 and PM10) and the determination of their concentrations.

Keywords: dust pollution, PM2. 5, PM10, solid suspended particles, fine dust fractions, student dormitory

The article provides a brief overview of the creation of the Diagrid system, describes the concept of forming this structure, its key elements and their role in creating geometrically immutable integral structures. The main directions of application in construction and the peculiarities of work on vertical and horizontal force effects are given. It also provides an overview of the materials of construction used and the main design constraints. This article will be useful for design engineers and architects engaged in the design and calculation of high-rise buildings, as well as buildings with a complex architectural form made of reinforced concrete and metal structures.

Keywords: diagrid, mesh supporting structures, reinforced concrete structures, metal structures, stability, free architectural form

The article deals with the difference model of coordination of general and private interests in the distribution of resources in marketing networks. The dynamics of a managed system describes the interaction of members of the target audience (base agents), leading to a change in their opinions (spending on the purchase of goods and services of firms competing in a certain market). The gain of each firm includes two components: the total opinion of the base agents, taking into account marketing costs (the common interest for all agents of influence) and the return on investment in some private activity. The Coordinating Center determines the marketing budgets of the firms and maximizes the total opinion of the base agents, taking into account the resources allocated to the firms. The total discounted income of the Center and the agents of influence are found. The results are analyzed and the optimal allocation of resources is concluded.

Keywords: models of coordination of public and private interests, simulation, modeling, marketing, resource allocation, budget, private activity

This study shows how it is possible to reduce the cost of transporting bales of biomass from the place of their production – the field, to the place of storage and processing on farms. The developed model of increasing the number of small warehouses allows farmers to transport round bales to storage locations in the most efficient way. The calculation was carried out in a field with an area of 16 hectares, the optimal distance for transporting bales is 0.8 km.

Keywords: straw, bale, biomass bale crop parts, bale logistics, bale transport from the field, delivery efficiency, transportation costs, bale storage locations, front loader, self-loading trailer

This article discusses the general waste management system in Russia, which includes five main areas (landfills, waste sorting complexes, waste incineration complexes, waste processing complexes, waste composting plants). Two types of sorting of municipal solid waste are considered: manual and automatic. Also, a scheme was proposed for the movement of the main products of solid municipal waste from the consumer to the finished final product.

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

The method of compaction of subsident soils by deep explosions is widely used in civil construction of buildings and structures. It is characterized by high efficiency of soil compaction and low financial costs for the production of works. This emphasizes the undoubted advantage of the method in comparison with other analogues. In this paper, some features of constructing a mathematical model of compaction of subsident soils by deep explosions are described. The conditions for the existence and uniqueness of the solution of boundary value problems in the framework of the investigated model are given.

Keywords: subsidence soil, loess, deep explosion, concentrated charge, elongated charge, soil compaction, mathematical model, diffusion equation, boundary value problem, solvability of the model

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

This article briefly discusses recurrent neural networks and bidirectional recurrent neural networks. A conditional random field is also described. In particular, we consider the vector representation in the form of the ELMo model, the bidirectional language model and its fine-tuning. A diagram of the architecture of a bidirectional recurrent neural network with CRF is also given.

Keywords: named entity recognition, neural network, word vector representation, language model, conditional random field, neural network architecture, recurrent neural network, natural language processing, bidirectional recurrent neural network

A model for assessing the consumer attractiveness of commercial real estate objects is described on the example of assessing the quality of sports and entertainment centers in the city of Perm. In the course of the study, a sociological survey was conducted to identify the factors that influence the choice of consumers of a sports and entertainment center to visit. The results of the survey became the information base for the model of assessing the quality and consumer attractiveness of the studied objects. Two approaches to the definition of quality were compared – the mechanism of complex assessment and the qualimetric model.

Keywords: commercial real estate management, sports and entertainment centers, integrated assessment mechanisms, management efficiency, quality of commercial real estate, consumer attractiveness, probability of choice, decision trees, convolution matrices

The article discusses the speed and direction of the wind as one of the key factors affecting the spread of carbon monoxide in the linear city of Volgograd. It also investigates the intensity and rolling stock of the traffic flow, which have a negative impact on the pollution of the surface atmospheric layers of the air. Research has been carried out on Raboche-Krestyanskaya street in order to measure the concentration of carbon monoxide on the curb of the roadway.

Keywords: road transport, wind direction, wind speed, meteorological conditions, sources of pollution, highways, residential buildings, meteorological stations

The article presents the results of research of dryung asbestos ores in a suspended layer. Equations are obtained that reflect the effect of the initial moisture content of the ore on the Nusselt criterion. The obtained dependencies can be used for calculating tube-dryers for asbestos ores in a suspended layer.

Keywords: drying, tube-dryer, asbestos ore, suspended layer, moisture content, speed of the material, mass transfer coefficient, Reynolds criterion, Nusselt criterion, criterion equations

When designing vibration machines and calculating their dynamic models, great difficulties are encountered. The presence of contacts of the working body with the medium significantly complicates the determination of the dynamic and kinematic parameters of the oscillatory system. This is due to the fact that different layers of the vibrated medium have different vibration amplitudes, therefore it is necessary to introduce the concept of "mass attachment", which is, as it were, rigidly attached to the working body and vibrates with its amplitude. It is difficult to determine the coefficients of elastic and dissipative resistance of the elements of the oscillatory system. The authors propose an experimental-theoretical method for determining all parameters of an oscillatory two-mass system with two degrees of freedom, which can be easily extended to more complex linear dynamical systems.

Keywords: vibration machines, vibrating system, road-building machines, free vibrations, phase-frequency response

The article discusses an optical vector analyzer with high resolution and high accuracy based on optical double-sideband modulation and stimulated Brillouin scattering. A model of an optical vector analyzer is presented.

Keywords: optical vector analyzer, double-sideband modulation, stimulated Brillouin scattering, fiber Bragg grating with phase shift, simulation, Optisystem

Traditional analytical methods for determining critical forces lead to difficult solutions of transcendental equations, therefore they are not universal and are ineffective for rods with complex design schemes. The proposed numerical-graphical method for determining critical forces, can be easily adapted to complex non-classical problems.

Keywords: Euler problem, rod, critical force, stability, differential equations, boundary conditions, finite difference method, eigenvalues