This article investigates methods to combine multiple data-driven models for forecasting time series. This is done in order to increase the accuracy of forecasts according to the historical error signal, such that it minimises downstream costs of forecast errors.

Keywords: time series, combination of models, accuracy assessment, forecasting, forecast accuracy

Currently, in the design and manufacture of steel products operating in conditions of heavy impact-abrasive wear, not only material is given, but also the structure of the product itself. One such detail is the friction wedge of a freight wagon trolley. In the presented work, a new design of the friction wedge of the vibration damping unit is presented; technical calculations are carried out on the strength of the presented design. The safety factors of spring suspension are calculated. All calculations were performed according to the standards for the calculation and design of new and modernized railroad cars of the Ministry of Railways 1520 mm gauge. The performed calculations indicate the high performance of the developed design, the obtained values ​​fully satisfy the requirements for such products. The result of the work on creating a new design of the friction wedge of the vibration damping unit is to obtain a patent for utility model No. 194823, a drawing has also been developed (KI-000.00.00.001) and terms of reference for experimental design work (KI-000.00.00.001 TK).

Keywords: friction wedge, vibration damping unit, freight car truck, strength, reliability, durability, calculation of spring suspension, static deflection of spring suspension, coefficient of structural margin of deflection, coefficient of relative friction

The article considers one of the main systems that ensure the safety of workers and passers – by in a dangerous zone-the protective-catching grid. The types of grid systems, basic principles of their operation, and technical characteristics are described. The requirements for the installation and operation of such systems are considered.

Keywords: grids, construction, security, organization, security screens

The compositions of class B15-20 peplotuf concrete on tuff ash and crushed stone with the use of a plasticizer for use as a structural and thermal insulation layer in two-layer wall panels are proposed. The calculated heat transfer resistance of a two-layer structure is determined, and the dependence of the density and strength of the mixture on the cement consumption per 1m3 is established.

Keywords: tuff rubble, tuff ash, expanded clay concrete, peplotufobetonnaya mix, multi-layer wall panel, structural and thermal insulation concrete

The article presents the results of an experiment to measure the bandwidth of a WI-FI network with a different number of networks on a single channel. The formula for calculating throughput is given.

Keywords: WI-FI network, bandwidth, network speed

In modern technology, long inter-bearing rotors are widely used. These are augers with stiffer suspension - the propellers of rotor-screw machines. Screw augers - the working bodies of snowplows. The static and momentary imbalance of the support rotor in this case leads to a serious imbalance in the operation of all mechanisms. There is a need for vibration and noise reduction when operating machines equipped with long screw rotors. The basic rule in the design and calculation of long screw rotors is to ensure their balanced operation. The tasks of the presented surveys are the derivation of the equations of dynamics of long inter-bearing rotors in order to reduce vibration loads on their supports.

Keywords: dynamics, long screw rotor, auger, vibration, balancing, balance, dynamics equations

A brief analysis of dependencies for calculating the punching of reinforced concrete slabs used in domestic and foreign design standards is presented. The results of an experimental study on experimental samples of the strength of a monolithic floor slab with a central punching by column of square and rectangular cross-sections are presented. Comparative analysis of experimental and calculated values of destructive loads showed a significant excess of the calculated values for the sample with a rectangular column. The observed excess of the calculated values of destructive loads over the experimental values is due to the presence of features of the stress-strain state in the zone of punching for rectangular columns. The excess of the calculated value of the destructive load over the experimental value noted during tests indicates a decrease in the structural safety of such interface nodes in the monolithic girderless frame of buildings.

Keywords: reinforced concrete, monolithic girderless frame, punching, loading platform, prototype, destructive load, prismatic strength, deformation, strain gauge

The description of the conveyor device intended for transportation of easily damaged goods is presented. A special feature of the device used is a conveyor belt containing ferromagnetic rods. Moving the conveyor belt and fixing the element on the conveyor belt is determined by the location of the coils on the frame and the speed of switching the voltage supplied to these coils.

Keywords: conveyor devices, the device is easy to damage the conveyer belt, the ferromagnetic cores of electromagnetic coils

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 presents a description of the computational model and the results of modeling the stress-strain condition of cable-stayed structures. The calculations are performed in a geometrically nonlinear formulation.

Keywords: stress-strain condition, cable-stayed structure, geometric nonlinearity, flexible cable system, spatial framed system

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

Interdisciplinary is a fundamental category of functioning of all systems of modern science, it is achieved through convergence and becomes a new form of educational environment. The article presents the conceptual foundations of complex modeling of a holistic system of training of a specialist of an engineering university, updating interdisciplinary requirements to educational results. The methodology of the system approach, which allowed to develop a universal algorithm of disciplinary synthesis of all training cycles, was chosen as the national scientific basis of the study. As a result of solving the problem of functional adaptation of the educational model, an information model of interdisciplinary connections is formed on the basis of integrative parameters. As a didactic product of interdisciplinary integration are interdisciplinary cycle complexes, the algorithm of functioning of which is controlled by the methodology of construction and development of the general phylosophical category "scientific picture of the world." It has been shown that the inclusion of methodological bases of this category in the process of organizing the integrity of the engineer 's training provides forms of synthesis of scientific knowledge at all levels of the educational environment - internal, interdisciplinary and transdectoral. In this way the idea of convergence of the content of education as a means of increasing the level of integration is realized, which directly correlates with the fundamental goal of engineering training - formation of a holistic worldview and scientific outlook of the future specialist. An example of methodological organization of the educational process of the engineering university within the framework of the interdisciplinary approach is given.

Keywords: educational model, design algorithm, system modeling strategy, functional model adaptation, control algorithms, interdisciplinary, knowledge convergence levels

Issues related to the features of multi-channel signal processing based on superresolution methods using a system with a quasi-ring arrangement of receivers are considered. The output characteristic is compared using the classical processing method (radiation pattern is formed) and the superresolution method (direction-finding relief is formed). As a basis of the signal processing algorithm, the property of 2π-periodicity of the angular dependence of the directivity characteristics of the receivers and the signal power is used. The issues of increasing the resolution in the angular direction of the received signals were studied during multichannel processing in a receiver system with a ring arrangement. The possibility of a significant improvement in resolution during the transition from the classical method to the method of superresolution is shown.

Keywords: multichannel processing, radiation patterns, Hamiltonian cycle, angular distribution, annular and quasi-ring antenna array, directivity characteristics, synthesis of amplitude-phase distribution

The article considers examples of cities with a linear-elongated configuration. Issues of air pollution are considered, examples of components of pollutants coming from stationary and mobile sources are given. Statistical data on human diseases in the Volgograd region for the period 2008-2017 are presented. Considers the issues of monitoring for the city of Volgograd.

Keywords: linear city, highway, pollution, carbon monoxide, monitoring, monitoring posts, disease statistics, combined action, vehicles, noise, gas pollution, health, exhaust gases, length

In this paper, we consider the aspects of identifying criteria for increased comfort of the territory of residential facilities. The concept of increased comfort is influenced by a variety of heterogeneous factors. However, a clear method for classifying these criteria has not been defined.The purpose of this work is to identify the criteria for increased comfort of a residential complex and study the features of the layout of these objects. This article discusses the qualitative and quantitative indicators that make up the concept of ""increased comfort"". The authors have studied the stages of organization of the territory of a high-comfort residential complex and their components. Parameters and environmental factors that influence decision-making in construction are identified. Functional zones of the territory of the residential complex of increased comfort are defined. In this paper, we propose a scheme that allows us to classify the criteria of increased comfort for a residential complex based on indicators of technical principles of organization and architectural and planning structure.

Keywords: residential complex superbly comfortable, the organization of the territory and architectural-planning structure, functional area