The article is devoted to research of thermofluctuation processes of insulating materials of power cable lines (SCR) of electric power systems. It was established that an artificial neural network (ANN) can be used to compile a forecast of the temperature regime of a current-carrying core with an accuracy of 2.5% of the actual value of the core temperature. The comparison of the predicted values ​​with the actual ones allows us to talk about the adequacy of the selected network model and its applicability in practice for reliable operation of the cable system of power supply to consumers. The development of an intelligent system for predicting the temperature of the core SCR contributes to the planning of the operating modes of the power grid in order to increase the reliability and energy efficiency of their interaction with the integrated power system.

Keywords: Neural networks, thermofluctuation processes, insulation materials, neural network architecture

The article describes the specifics of OOP concepts implementation in the open source projects that contain address book model in comparison to OASIS UBL Party Reference model. The open source software analysis is performed using the formal criteria for evaluating the matching between open source project models and reference model based on quantitative characteristics, conceptual graph transformation and cluster analysis. First, the scope coverage, elaboration factor and structural connectedness were calculated based on model parameters. Second, the domain models were represented as conceptual graphs and they were compared based on semantic equivalence. And third, the model was clustered into four subdomains, and quantitative characteistics were evaluated separately for each cluster. Based on the experimental results of model analysis the authors propose methods to reduce the conceptual mismatch between reference model and project models.

Keywords: OOP, semantic analysis, reference model, OASIS UBL, conceptual graph, cluster analysis

This article discusses the problem of network authentication of a client when a functional web-system consists of various services, each of which is represented by a separate site. Particular attention is paid to Single Sign On technology - a single entry point as a way to achieve centralized authentication. A comparison of tools that provide a single input is given, and a conclusion is made about the best of them. Based on the research, the author proposes the Gluu single entry point server as a server that satisfies all the requirements of the functional service system presented in the example, and also able to work within the framework of popular authentication protocols.

Keywords: functional service system, authentication, authentication protocol, single entry point, single entry point server, comparative analysis

The article deals with the issue of modeling by the finite element method of the penetration of the communication tunnel under the operating multi-lane highway demand microtonneling, horizontal directed drilling and construction under the protection of the screen from pipes

Keywords: Tunnel, collector, finite element method, microtonneling, horizontal directional drilling, motorway, case, reinforced concrete, metal pipes, settling mule

The article discusses the results of the calculation of reinforcement in monolithic reinforced concrete floors. The subject of the study is the reinforcement of the slab section located next to the column. The study was carried out by setting up a computational experiment. Modeling was performed in software systems: Revit, Sapphire and Lira-CAD. Finite element models were calculated in Lira-CAD software. A total of 7 series of samples were calculated. The samples are a fragment of a monolithic reinforced concrete floor of a civil building. Investigated factors: triangulation parameters; the presence or absence of absolutely rigid bodies in the node. The authors performed a comparative analysis of the results of a computational experiment. It was found that for the most correct and economical selection of reinforcement in models without the use of AFL, it is desirable to take the triangulation step in the slab equal to the side of the column section or more than this value by no more than 15%, since an increase in the size of the finite elements leads to an underestimation of the reference moment and the resulting area calculation longitudinal working reinforcement. With this approach, the value of the maximum moment, and, therefore, the area obtained by the calculation of the reinforcement will be 6% higher, which makes it more preferable, although it increases the complexity of creating a finite element circuit.

Keywords: BIM technology, reinforced concrete, girder-free overlap, reinforcement, triangulation, finite element, reinforcement selection, computational experiment, Rewit, Sapphire, Lira-CAD

The article presents an analysis of objects with concrete-filled steel tube columns. Also the article describes methods for solving the concomitant disadvantages and describes ways to increase the effectiveness of this solution. Prospects for studies of increasing the adhesive component of the mutual work of the concrete core and steel shell are presented. The analysis allows you to give recommendations on the following issues: improving the technological level of concrete-filled steel tube columns, the convenience of joining the column with the frame.

Keywords: concrete-filled steel tube columns, combined steel and reinforced concrete structures, tubular section, fixed formwork, steel cage, concrete core, adhesion of materials, side compression effect, frame building, construction in the low-temperature conditio

The reconstruction of the basement of a two-story brick building is considered. The reconstruction of the basement was preceded by a technical inspection of structures and elements, which revealed damage. The condition of the basement structures was assessed, the causes of damage were identified, and a project was developed to eliminate them. The main tasks of the reconstruction included: eliminating the facts of flooding by waterproofing the walls and floor of the basement, developing a recipe for dry mix for shotcrete, eliminating the identified damage and reconstructing the basement walls.

Keywords: basement, flooding, water resistance, strength of concrete under compression, cement, silica fume, organo-mineral complex additive

This article discusses the new technological solutions for the installation of green roof structures. The developed technologies are aimed at solving the problems of improving the environmental safety of construction production, improving the comfort level of the urban environment, and improving the urban appearance. Green roof structures are considered as a way to reduce the concentration of dust pollution and its spread, including from construction production by implementing this technology in the design and construction of residential neighborhoods, where there is a phased commissioning of facilities and residents of already populated homes experience the effects of pollution from objects being built in the neighborhood. The article describes in detail the characteristics of two developed green roof structures that can be used in the design and construction of new facilities, as well as in the reconstruction of existing buildings, describes the device technology, and calculates the cost of installation. These technological solutions allow you to save labor costs during construction work, by reducing the increase in the incidence of workers and, accordingly, reducing the cost of construction work.

Keywords: environmental safety, green roof, phytoecology, atmospheric air protection, ecology in construction, dust suppression, dust settling, construction in confined conditions, roof, landscaping system

The current problems of calculating the distribution of water flow along the branches, in multi-arm river sections are considered, the problems of current calculation methods are identified, a new calculation method is proposed, the proposed method is analyzed for efficiency, a calculation optimization method is proposed, a regularization parameter is proposed, an analysis of the changed formulas is carried out, analysis of the changed formulas is carried out, analysis is carried out calculation errors.

Keywords: waterways, water expenditures, modeling

This article analyzes the existing sources of power supply of oil and gas industry facilities, as well as the study of the possible use of alternative energy sources in industrial enterprises; The advantages and disadvantages of using this type of power supply for remote infrastructure are considered.

Keywords: energy, power supply, power plant, industrial facility, wind, solar radiation, power, power plant, wind energy, source

The paper is based on a review of the scientific publications released from May through October 2019, the greater part of which, namely 14 papers, is included in the Web of Science scientometric database. The authors of the papers analyzed explore the construction industry problems over the past 5 years. The foreign studies listed in the reference section were based on the analysis of reviews falling in the above-mentioned timeline. The purpose of this paper is to identify the problems hindering the implementation of BIM technologies in the construction sector, not only in the foreign countries, but also in Russia.

Keywords: building information modeling, construction organizations, critical problems, external factors, absence of organizational support

The configuration of the transport network is important for the efficient operation of the transport system. It significantly affects the cost of transportation and their reliability. The construction of each individual element of the network is the implementation of a very specific solution, but the overall development of the network largely manifests internal patterns. One approach to studying such patterns is to model the natural development of the transport network. This paper proposes a formalization of various approaches to modeling the natural development of networks and identifies strict relationships between the approaches under consideration.

Keywords: transport network modeling, dynamical model, stationary model, the configuration of the transport network, transport network topology

The article presents the usage of the semantic network for storing and retrieving information from unstructured sources. The authors describe the semantic network model based on labeled oriented graph, consider basic semantic network elements (concepts, relations and attributes) and basic relation types between elements (hyponymic and meronimic as well as class-instance relations), and define main single and group operations on the network. Besides the method of storing the concept instances and related wordforms and glosses for automated information retrieval from semi-structured sources is provided. The designed semantic network is decomposed into atomic concepts providing absence of stored information redundancy without necessity to apply the normalization procedure. The developed model was applied in several practical tasks, for example in real estate information parsing, the address information system input validation, and information extraction from spreadsheet data. The model was improved and extended based on experimental results.

Keywords: semantic network, graph model, concept, relation, attribute, instance, semi-structured data

The article considers the limitations that currently exist in the supply of military Universities with applied proprietary software products necessary for the implementation of relevant educational programs and the organization of scientific work, identifies the most popular software solutions for this category, proposes the closest analogues among free software and criteria for their selection.

Keywords: mathematical systems, proprietary software, free software, information and educational environment, program selection criteria

The article presents the results of an on-site test spatial metal farm of an aircraft hangar with a span of 72 m. A comparative analysis of the data obtained by the simulation of the farm from the predicted loads (taking into account the actual geometry) and the on-site tests is performed. During the assessment of the technical condition and testing, significant errors were identified in the design and manufacture of gate frames structures,which could lead to loss of bearing capacity or unsuitability for normal operation. Based on the test results, measures were developed and implemented to strengthen the elements of the farm, repeated full-scale tests were conducted. Based on the foregoing, the span structure is recognized as suitable for safe operation.

Keywords: test, metal truss, bolted connections, compliance, bearing capacity, deformability, gate frame, reliability, static calculation