This article is devoted to the study of indoor air quality in a higher education institution: assessment of the distribution patterns of suspended solids by equivalent diameters (RM0.5, RM1, RM2.5, RM5 and RM10).

Keywords: indoor air, indoor air quality, air pollution, dust, solid suspended particles, PM2.5, PM10

The article proposes a special device to transport earth when building an underground part by the «top-down» and «top and down» technique. The developed device is fully electrically powered. The proposed technology enables to completely exclude nonproductive movements of excavating and transportation devices to relocate the earth from the working site to the dumping site onto trucks above ground. The device is adapted to work as part of the production line when realizing the “top-down” and «top and down» technology. To exclude load lifting mechanisms for lifting and dumping of the earth onto the trucks above ground, it is proposed to use two lifting rails with hoisting equipment fixed on a metal frame.

Keywords: “top and down” technology, earth works, excavation works, subsurface part of a building, earth movement, tier of a subsurface part of a building

The article provides an analysis of the occupational morbidity of welders, the nomenclature and levels of hazardous and harmful production factors at the workplaces of welders, and also formulates measures for the prevention of occupational diseases and industrial injuries of welders.

Keywords: occupational diseases, dangerous and harmful production factors, occupational risk, special assessment of working conditions

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

The article discusses the need for a cost examination in the implementation of investment activities of renovated objects. The article is devoted to the actual problem of renovation of real estate objects. The key stages of technical expertise and methods for assessing the technical condition are investigated to determine the cost indicators of the renovated object. The article is devoted to a comprehensive study of the factor space, which is formed by technical and geo-economic factors and has a significant impact on the cost indicators of an investment renovation project. The article deals with the problem of determining the investment attractiveness and economic efficiency of renovation. The scientific novelty of the work lies in a comprehensive study of the factor space and cost indicators of the renovated object to determine its investment attractiveness.

Keywords: renovation, cost expertise, cost indicators, investment attractiveness, geo-economic and technical factors

The article discusses the features of the proposed methodology for developing practical tasks for automated control of knowledge and skills in training IT specialists. The methodology is presented using the example of tasks for controlling knowledge and initial skills in the field of software testing and describing the functional requirements for software. The application of the methodology contributes to the development of e-learning tools and distance learning technologies in training IT specialists (in particular, university students in relevant areas). The research is supported by a stipend of the President of the Russian Federation to young scientists and post-graduate students (No. SP-100.2018.5), which was assigned by the grants Council of the President of the Russian Federation.

Keywords: IT specialist, professional knowledge and skills, knowledge and skills control, automated training systems, software testing

The analysis is made of the use of expanded clay gravel in cement-sand mortar in order to reduce ice at the boundary between the pile and the mortar. The application of expanded clay concrete in block-modular buildings is considered. Lightweight design and reduced heatloss are proven.

Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

The article presents an analysis of the impact of fine dust particles on the health of builders, released during the production of construction processes and suggests measures to reduce it. A serious threat to the health of workers on the construction site and people living in the vicinity of it is represented by fine dust particles in a suspended state, both in themselves and in the total concentration of harmful air pollution near construction production. Analysis of the monitoring of suspended matter concentrations has shown that the ratio between the time of exposure to suspended dust particles in different concentrations directly affects the health of people. Air pollution in the work area negatively affects performance, causes diseases in workers, and can cause injuries due to reduced visibility. The organization of conditions corresponding to labor protection and safety, healthy environmental conditions on the construction site will ensure an increase in labor productivity by up to 12% and improve the quality of processes performed.

Keywords: environmental safety, environmental monitoring, air protection, ecology in construction, dust suppression, dust deposition, dust collection systems, labor protection in construction

"The article is devoted to solving the problem in the field of development of methods and means of automation of evaluation of training efficiency on computer simulators, which are used for the training of operators of production processes. Approaches to assessing the effectiveness of training are given in many scientific studies on the creation and application of computer simulators. However, the problem of automation of the process of this assessment on the basis of the simulators themselves is not sufficiently considered. The evaluation methodology (based on mathematical statistics methods) and the prototype subsystem of the computer simulator complex were proposed to solve the indicated problem. They reduce the effort of the expert responsible for performance evaluation. Output results can be used for training operators in educational organizations. The reported study was funded by RFBR according to the research project № 18-38-00835. "

Keywords: computer simulator, mathematical statistics methods, efficiency of training process, automation of training process

The problem of increasing the efficiency of compiling test plans when testing complex software systems is considered. Automation tools for the development of test plans allow us to describe this document in a rather generalized way, without taking into account many of the attributes required for the success of the further stages of testing the software systems. The use of the developed automated system (AS), described in the article, allows to reduce the complexity of creating test plans due to the presence of a clear sequence of steps in the preparation of the document, providing the specialist with background information and advising effects. In the future, this AS can be used both directly in the development of test plans in the course of real software projects, and in training novice specialists in the skills of filling out these documents.

Keywords: software testing, test plan, automated system

The process of cavitation is one of the reasons for the premature wear of pumping equipment components. Elements of a pumping wheel are subject to the greatest wear. In addition, cavitation causes undesirable effects such as vibration and noise. In order to reduce cavitational damage and increase the service life of pumping equipment, the authors of this article propose to install a special-shaped flow divider at the pump inlet that breaks the flow entering the pump into separate jets of a certain shape and structure.

Keywords: fluid, centrifugal pump, regulation, cavitation, flow, bubble, flow divider

The article discusses the causes of the emergence of digital noise in video sequence images. It is proposed to evaluate the effectiveness of noise suppression methods by measuring the peak signal-to-noise ratio. A method is proposed for preliminary improvement of the quality of images in a video sequence for further processing in order to search and recognize objects on a complex background. The originality of the method consists in using the analysis of the contribution coefficient of single images in a video sequence. The results of experiments with images from the USC-SIPI database are presented. The results obtained are not inferior to their counterparts, and surpass them in some indicators.

Keywords: video sequence processing, video enhancement, object recognition on a complex background

It is shown that the problem of simultaneous processing of dynamic information arrays of different degrees of structure and fuzziness is currently relevant. One of the prototypes of mathematical models containing such information structures is the problem of practical distribution of resources in the conditions of possible, difficult to formalize effects. In this problem there are two factor for the rational allocation of resources: network bandwidth to operating conditions and the preference of the routes of transmission resources on the network in terms of the alleged destructive effects. The high degree of uncertainty inherent in the process reduces the feasibility of resource-intensive distribution algorithms. At the same time, it is necessary to obtain a variety of alternative solutions with diversity in terms of resistance to possible impacts. Since, if all routes pass through one transit node, all of them will be equally exposed to the threats of impact inherent in this node, and when it fails, there will be no alternative routes, which will require re-search of routes for the transfer of resources. Fast heuristics, based, for example, on greedy approaches, can not provide the proper diversity, therefore, even with clear formulations of optimization problems, fall into local Optima. For this reason, it is advisable to Supplement the initial solution formation procedure with borrowed solutions from the previously considered problems. In order to improve the solutions obtained at the stage of formation of the starting population, and to ensure the diversity of the descendants of these solutions, describing the routes of resource transfer, an evolutionary algorithm for finding the set of the shortest time routes of resource transfer. The peculiarity of the process of solving the problem proposed algorithm is to maintain the diversity of the population of solutions to possible threats.

Keywords: intelligent algorithm, distribution, fuzzy space, adaptation, transport networks

The article discusses the process of sulfuric acid alkylation used to produce high-octane gasoline, as well as the design of jet reactors, their advantages and disadvantages. Based on the existing drawbacks of jet reactors, the development of a new high-efficiency jet reactor design has been proposed.

Keywords: reactor, sulfuric acid alkylation, isosurface, isocontours, gasoline, fractions, jet type, industry, oil refining

The article is devoted to solving the actual problem of improving the efficiency of software testing based on the development of an automated control system for this process. The structure of the created system is proposed, which allows specialists to form the advising effects for the best implementation of each of the software testing stages. Optimization models are presented that ensure the correct selection of the values of various attributes of test plans, test cases, defect reports and other documents created during the testing process. The structure of the neural network and the concept of its application for the most accurate selection of attribute values are described. The research is supported by a stipend of the President of the Russian Federation to young scientists and post-graduate students (No. SP-100.2018.5), which was assigned by the grants Council of the President of the Russian Federation.

Keywords: software testing, optimization methods, automated control system, neural networks, test coverage