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  • Principles of design of coastal territories in the structure of a large city: on the example of Volgograd

    The article considers the trends in the development of coastal management in the United States, great Britain and Australia, and analyzes the current situation of the coastal zone of Volgograd. Recommendations are offered based on the experience of foreign countries.

    Keywords: coastal zone, management program, coastline, waterfront area environment, sustainable planning, design approach, architectural environment, waterfront

  • Institutional barriers to the development of the knowledge economy

    The formation and effective development of the knowledge economy in the country is possible only with a stable and Mature institutional environment. Indices of the knowledge economy and institutional regime calculated using the world Bank methodology determine the country's readiness for further development. According to the rating, Russia shows a problematic institutional component. The article examines the main institutional problems and barriers, namely institutional traps that hinder the development of the knowledge economy, explains their mechanisms and consequences for the Russian economy, and suggests ways out of them.

    Keywords: knowledge economy, institutional traps, barriers, innovation, economic development, mechanism

  • Strategic planning in a construction organization

    The essence of strategic planning is revealed. The importance of strategic planning in construction is proved. The stages of strategic planning are briefly described. The strategic planning procedure is described. The stages of implementing the strategic plan are outlined.

    Keywords: strategic planning, organization, construction, resources, financing, development, modeling, expert, implementation, information

  • Modeling the output amplifier of a photodetecting device

    Recognition of radiation from celestial bodies by technical means is an important task in the orientation of spacecraft. For a device that is part of the Earth orientation device, a variant of modeling an electronic signal amplifier received from a pyroelectric sensor is studied. On the recommendation of the developers, the properties of trans-impedance operational amplifiers were studied, and suitable coefficients for the negative feedback circuit were selected. The type of output signal of the model is studied in comparison with the recording of values taken from a real photodetector. The preferred design of the model in the Matlab Simulink environment is shown – a model defined by an electrical circuit using the Simscape Electrical library.

    Keywords: simulation of electric circuits, space orientation, photodetecting device, transimpedance amplifier, optoelectronic devices, space instrumentation

  • Development of a dynamic model of the electric drive of the Earth orientation device scanning mechanism

    The article reveals the results of the work carried out on modeling the dynamic model of the electric drive of the scanning mechanism of the Earth orientation device, which is based on a hybrid stepping motor. The simulation is based on NEMA 17HS3410 motor parameters. A brief description and features of hybrid stepper motors are provided. The simplest model of an electric drive is considered, in which there is a rigidly set moment of force, a moment of inertia of the rotor of an electric motor, and also the moments of dry friction and the moment of liquid friction are taken into account. It is shown how the change in the value of fluid friction affects the general behavior of the mathematical model of a hybrid electric motor. The behavior of a single-pole stepper drive is simulated. The relationship of the value of the moment of force acting on the rotor with the passport characteristics of the investigated electric motor is considered. The possibility of controlling the scanning mechanism based on P- and PI-controllers is estimated.

    Keywords: electrodive, Simulink, moment of force, inetria moment, liquid fricton

  • Integrated usage of a linear regression model and a neural network in the problem of predicting the trend of Bitcoin cryptocurrency quotes

    The paper presents an integrated approach using machine learning methods for choosing a trading strategy on the currency exchange. The presented approach uses the calculation of the linear regression angle coefficient by log return indicators and determination of the BTC/USD currency pair quotes trend in the next period based on the calculated coefficient sign. The feedforward multilayer neural network is used to predict the angle coefficient value in the next ten minute period for the current twenty minute period. The paper proposes a combined approach to the use of machine learning methods for choosing a trading strategy in foreign exchange. The study presents the results of experiments evaluating the practical results of effective and ineffective strategies based on the predicted values ​​of linear regression coefficients.

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

  • On the issue of calculating the steady-state modes of electric power systems

    When determining the locations of compensating devices, it is necessary to make complex calculations that take into account various factors (included in the equations in the form of variables). To get results, calculations are performed repeatedly. Newton's method with coefficients in the form of a Jacobi matrix is widely used. An algorithm for solving the necessary equations by the Gauss method is considered, and the required number of iterations is determined to obtain reliable results.

    Keywords: compensating devices, electric power, network state, nodal conductivity matrix, Gauss method, algorithm, Newton's method, electrical nodes, iterations, convergence, algorithm

  • Development of a methodology for constructing a fault-tolerant authentication system for low-orbit satellites operating in a polynomial system of residue classes

    One of the effective ways to increase the information secrecy of a constellation of low-orbit spacecraft (LVS) is the use of a satellite authentication system (SAS). In order to reduce the time spent on determining the status of the satellite, as well as to increase the fault tolerance of the identification system, in a number of works it is proposed to use the codes of the polynomial system of residue classes (PSCS). This paper presents a methodology for constructing a fault-tolerant authentication system for a spacecraft, which is based on exchange operations implemented in PSKV codes. Using exchange operations, that is, changing the number of informational and redundant bases, it is possible to ensure the possibility of maintaining the operational state of the identification system in the event of a sequence of failures, as a result of which the level of information secrecy of the NSA will not be reduced.

    Keywords: satellite authentication system, polynomial system of residue classes, exchange operations, method of building a fault-tolerant identification system

  • Optimization of starting processes using semiconductor thermisto

    The article provides a brief analysis of the starting processes of electrical devices. The mathematical formulation of the problem of synthesis of starting rheostats is formulated and its solution is proposed. The main condition for optimal starting of electric motors using thermistor rheostats is presented. Optimal diagrams of the starting current and set of revolutions are given. and also, the change in heat losses in the anchor chain. Recommendations on the layout of starting rheostats are given.

    Keywords: thermistor rheostat, optimal start-up, thermal start-up characteristic, optimal control problem, DC motor, boundary conditions, speed

  • Using numerical simulation to calculate the motion of an ion beam in a laser mass spectrometer EMAL-2

    The article considers the dynamics of an ion beam in a laser mass – EMAL-2 spectrometer.a numerical model based on the "large - particle" method is Implemented, taking into account the influence of spatial charge fields and the interaction of charged particles with the field of an electrodynamic system. The software package that implements the mathematical model of ion beam motion consists of two parts. The first part is a program written in C++, in which initial conditions are set, the Coulomb interaction between large particles is calculated using the "particle-particle" method, the system of differential equations (1) is integrated using the fourth-order Runge-Kutta method, and the results are recorded and processed. The second part is a script for the FreeFem++ package, which implements the solution of partial differential equations using the finite element method. A series of numerical experiments and their comparison with the data obtained experimentally are carried out.

    Keywords: large particle method, laser mass spectrometer, particle-particle method, electrodynamic system, Runge-Kutta method, laser plasma, magnetic analyzer, ion beam, focusing system, triangulation

  • Using LSM method to identify parameters according to the example of BLDC motor

    This article illustrates specifically how to use least squares method (LSM) and sensitivity function to cope with parametric identification problems. The object of this task is BLDC motor. The example of BLDC can justify the application of LSM and sensitivity function method for estimating nonlinear dynamic objects’ parameters, and the application for motor controlling system in particular. The model in the article is conducted by Matlab. The output is a proof to convey that the method used in solving the problem is accurate, and proves the possibility of its application in scientific and engineering field.

    Keywords: parametric identification, least squares method, sensitivity function, BLDC motor, electric drive

  • Coordination of the power of the heat generator and the burner

    This article presents the results of the analysis of factors influencing the burner device of heat generators, as well as methods for their selection. The results of an experimental study of the dependence of the efficiency of heat generators on the operating power of burners are presented. Recommendations have been developed for choosing a heat generator and a burner.

    Keywords: heat generator, burner device, Gorenje mode, operating power, heat balance

  • Changes in thermodynamic parameters of gas flow in a long step gas pipeline

    The article proposes a thermodynamic approach that allows us to more accurately represent the flow modes of quasi-stationary gas through a long step gas pipeline . It takes into account the peculiarities of the operation of side gas venting devices of small-caliber automatic guns on the principle of automatic operation. We use a combination of the main characteristics that represent the operation of such systems under difficult loading conditions and high temperatures. These are mainly gas consumption, heat transfer losses, gas flow rate, improvement of the approach to the solution of ensuring the appropriate parameters to ensure the reliable operation of the relevant technical systems with the possibility of recommendations after appropriate tests of such products.

    Keywords: step gas pipeline, side gas outlet device, gas flow, thermodynamic parameters, heat loss, filling period, gas consumption, automatic weapons systems

  • Justification of the expediency of using a vibro-vacuum unit when cleaning adjoining territories in Tyumen

    A device for compacting the snow mass using the vibro-vacuum compaction method has been designed. Calculations were made in the SolidWorks 2018 software product. The calculation of the estimated economic efficiency of compaction of the snow mass using vibro-vacuum compaction was carried out.

    Keywords: cleaning of the adjacent territory, vibration-vacuum compaction, installation, calculation of economic efficiency

  • Study of the problem of determining the exact indicator of the physical deterioration of a building

    Physical wear and tear can be determined either by studying with the help of instruments, or relying on regulatory and expert methods. The first helps to obtain reliable indicators of physical wear, but to obtain it requires less materials. Normative and expert methods - the second make it possible to identify the degree of wear with less accuracy, but it requires a small investment of materials and time. Two similar methods include the "Methodology for determining the physical deterioration of civilian buildings", which was created by MINKOMHOZ of the RSFSR, as well as Departmental building codes 53-86 (r) "Rules for assessing the physical deterioration of residential buildings." The problem of lack of information in the absence of the possibility of personal inspection of the evaluated structure, and, in addition, the obsolescence of the methods makes it difficult to use them. In this case, it is logical to use calculation methods.

    Keywords: corrosive wear; reliability; durability; classification