bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of an integral criterion for evaluating the degree of aging of transformer oils
Authors: Davidenko I , Egorov A 
Published: November 2020

Abstract
The technical condition of the transformer oil affects the condition of the solid insulation, and therefore the residual life of electrical equipment, so it is important to study the aging mechanisms of the oil. The mechanism of transformer oil aging is studied using factor analysis of oil quality indicators, such as moisture content, acid number and dissipation factor tangent. Factors that have the greatest influence on the rate of oil aging have been found. In accordance with the found influence factors the permissible values of oil quality parameters of 110 kV power transformers with division by equipment tightness, oil brands and operating time have been determined. Oil aging models, taking into account the mutual influence of oil quality parameters, have been developed for transformers with different oil brands, type of oil protection and service life. An integral index, characterizing different aging processes of the oil, has been proposed. The criterion for evaluating the integral index of oil aging rates is calculated.
Electromagnetic separation of impurities in a conductive medium
Authors: Ozernykh Vladimir S. , Losev Gennady L. , Kolesnichenko Ilya V. 
Published: November 2020

Abstract
A numerical study of the flow of an electrically conductive fluid is carried out in a cell under the action of a constant magnetic field. Distribution of electromotive force is investigated as well as the topology of electric current in the cell. The evolutions of velocity field are studied for different parameters. Two large scale unstable eddies are generated in the cell. The characteristic of the flow oscillations are determined using the wavelet analysis. It was found that an increase of current does not lead to the appearance of additional oscillation modes. Asymmetric pressure distribution may appear in the cell. Particle movement are possible due to the asymmetric pressure field.
Energy-efficient installations of multi-zone multi-frequency induction heating of steel billets for large deformation
Authors: Lusgin V I , Lopatin I E , Shalina E P , Petrov A Y , Fatkhullin S M , Alekseev I G 
Published: November 2020

Abstract
This article discusses the basic construction principles of the device for multi-zone induction heating. The mathematical model of a cascade inverter is described. Various modes of heating cylindrical billets are considered depending on the ratio of powers in the heating zones and current frequencies in the inductors. The indicators of heating uniformity over the cross section and energy efficiency are studied. Based on the data obtained, a conclusion is drawn about the optimal choice of the number of heating zones, frequencies of inductors and heating modes.
Free metal surface resonance under alternating magnetic field low-frequency oscillations
Authors: Sizganov N , Khatsayuk M 
Published: November 2020

Abstract
The article describes the definition of relationship between parameters of induction crucible furnace and meniscus shape using a mathematical model. The data obtained has been analyzed and the mathematical model qualitatively assessed using the open non-profit software Elmer and OpenFOAM. The models derived have been checked out to study the occurrence of free-surface oscillation resonance when subjected to pulsed action of an alternating electromagnetic field. Transients in an induction furnace crucible have been analyzed. A mathematical model with the electromagnetic field pulsed action has been created and free surface resonance occurrence and stability examined.
Identification of working reactance of industrial arc furnace equivalent scheme based on known specific electric power consumption for melting of charge
Authors: Kruchinin A M , Ya Pogrebisskiy M , Ryazanova E S , Yu Chursin A 
Published: November 2020

Abstract
Method of Identification of working reactance of industrial arc furnace equivalent scheme based on known specific electric power consumption for melting of charge taking into account complex (radiation and convection) nature of arc heat exchange in melting space is presented. The solution of the multi-factor problem of determining the share of arc radiation power and convective heating of charge by arcs in the furnace useful power was proposed at MPEI on the basis of analytical methods of the developed electric arc heat exchange model (EAHEM). Method of calculation of specific electric power consumption for melting of solid charge for specified type of arc furnace design is considered.
Induction heat treatment of large rolls with two independent power sources
Authors: Perevalov Yu , Demidovich V 
Published: November 2020

Abstract
The two-inductor heat treatment system for rolls of rolling mills is highly flexible and can improve the quality of heat treatment while solving energy-efficiency and productivity problems. A digital model of induction heat treatment of rolls with the computation of electromagnetic, temperature and stress fields is developed taking into account the characteristics of power supplies and control systems for heat treatment modes. Particular attention is paid to the reliability of frequency converters in the presence of magnetic coupling between inductors. Recommendations on frequency selection and inverter settings are given. A universal method of digital design and control of thermal conditions in induction heat treatment systems is considered.
Inductive level sensor: experiment and calculation
Authors: Eltishchev V , Mandrykin S , Kolesnichenko I 
Published: November 2020

Abstract
A non-contact induction technique for registering the free sufrace position of liquid metal is studied numerically and experimentally. A localized inductive level sensor (ILS) generates an alternating magnetic field and measures the resulting magnetic field. If an electrically conductive medium appears in the sensitive area of the sensor, this field changes. In the experiment, signals from the ILS were measured for a rotating cylinder with a beveled upper boundary, for different frequencies of alternating current, supplying the sensor generating coil. A set of calibration curves was obtained, that can be used to determine the cylinder rotation angle from the signal. In the numerical simulations, the three-dimensional fields of magnetic induction were obtained. The influence of the alternating current frequency, as well as the cylinder rotation angle on the ILS measurement, was studied. Numerical simulations show that increasing current frequency results in higher ILS sensitivity. The numerical and experimental results are in agreement. The developed technique is applicable for measuring the oscillation frequency of the liquid metal free surface.
In-melt electromagnetic forces at MHD-stirring with the non-sine supply
Authors: Vinter E.R. , Timofeev V.N. , Fomin A.V. 
Published: November 2020

Abstract
The crucial task in production of multi-component alloys is a development and study of MHD-stirring conditions which make it possible to achieve new process effects such as microinhomogeneous homogenization or MHD-resonance. One of the advanced ways to provide such stirring conditions is the supply of the non-sine periodic current of the given waveform to inductor coils. The paper presents the results of numerical simulation of a magnetohydrodynamic stirrer with non-sinusoidal power supply. The analysis of the behavior of electromagnetic forces at various power supply parameters is carried out. A comparative analysis of the obtained results with the characteristics of the MHD stirrer with a sinusoidal power supply system is carried out.
Intelligent complex security management system FEC for the Industry 5.0
Authors: Korneev N V 
Published: November 2020

Abstract
Taking into account the digital transformation, the prospects for the development of intelligent complex security management system FEC are revealed. For the first time a definition of intelligent complex security management system FEC is given, also, its generalized structure is developed, considering the development of the Russian human-machine concept, as a complex information-energy system, on the basis of intellectualization of theoretical principles of human physiology and psychology. Its main elements are defined: a core, subsystems and components and mathematical dependencies implementing management functions are given. The core, subsystems and components are represented by the protected system at the level of security threat management in the form of a block-functional system scheme with elements of artificial intelligence that differ in the detail level. The mutual influence mechanism of separate subsystems and components is defined through simple, hybrid and complex threats. Besides, system threats of FEC were classified and their definitions were given. As an example, we consider the complex threat related to security of critical information FEC infrastructure. What is more, the basic intelligent management principles of complex FEC security are formulated, based on the block-functional system scheme with artificial intelligence elements and operator state security Identification in real time. We obtained general equations of the output state variables vector, which is equivalent to the security model of the operator, vectors of output state variables in case of hybrid, complex, and system FEC threats.
Mathematical modeling of electromechanical characteristics of linear electromagnetic and induction-dynamic motors
Authors: Yu Sidorov O. , Sarapulov F.N. , Tomashevsky D.N. 
Published: November 2020

Abstract
The calculations of the electromechanical characteristics of the pulse action linear motor (PALM) with cylindrical symmetry are performed. The case of the motor power from the capacitor bank of a given capacitance is considered. The model of “field-circuit” was used for electromechanical characteristics modeling. The electromagnetic field was calculated by finite difference method taking into account the displacement of the secondary element (SE). The problem of circuit theory was solved together with the field problem (via flow coupling) in order to determine temporal dynamics of the current and voltage. The current and voltage in the primary circuit of the PALM, the force in the SE of the PALM, the value of the SE displacement was calculated for each time point. It is shown that the electromechanical characteristics depend on the design and material of the SE.
Model of power quality system using electric meter suppressor of fre and electric damage and hazards in the residential sector
Authors: Korneev N V , Prus Y V , Perikov A V , Smolenskaya N M , Smolenskii V V 
Published: November 2020

Abstract
The analysis, detailing, theoretical and technological justifcation of the concept of fre and electric damage. It is proposed to use the electric meter suppressor of fire and electric damage and fire hazards in the residential sector. The cognitive model taking into account possibilities of influence of the electric meter of the suppressor on decrease in damage for the electrical reasons and the functional model of electric power quality system are constructed. The cognitive model is considered as one of the components describing the external impact in the neurograph as a model to support control over the comprehensive objects safety for reducing fire risks in the residential sector associated with electrical causes of fires.
Numerical simulation and investigation of induction system for hardening of internal combustion engine camshaft
Authors: Kozulina T , Fomin I , Galunin S , Kudryash M 
Published: November 2020

Abstract
This paper describes the numerical simulation and investigation of the electrothermal processes in the induction system for hardening of cams and journals of camshaft. Hardening of the camshaft elements is carried out by one simple inductor of round shape due to shift of the camshaft axis inside it. During the process of the hardening of the cams, the camshaft is stationary, during the process of the hardening of the journals it rotates. The results of the investigations are presented in the form of the temperature distribution in the cam and the journal. The optimum parameters of the induction system are also given, at which the best temperature distribution in the elements of the camshaft is achieved.
Numerical calculation of large-sized objects induction heating
Authors: Smolyanov I. , Tarasov F. , Shvydkiy E. 
Published: November 2020

Abstract
The paper describes a numerical procedure for modeling induction heating of large objects. A coupled calculation of the electromagnetic and thermal fields is performed by the finite element method in a three-dimensional formulation. The setting of the computational mesh is described. The results of numerical calculations are demonstrated.
Research of a dual-frequency power supply system for induction crucible furnaces for melting ferrous and non-ferrous metals
Authors: Kamaev D.A. , Koptyakov A.S. , Lusgin V.I. , Frizen V.E. , Krivtsova E.V. 
Published: November 2020

Abstract
The article describes the power supply system of induction furnace based on a semiconductor converter, in which it is possible to work simultaneously in the exciting mode of low-frequency currents and frequencies three times higher when switching the compensation circuit of the furnace inductor at different stages of metal melting. Calculations of electromagnetic processes have shown the advisability of operating the power supply system in the mode of tripling the current frequency at the stage of heating and melting of the metal, but in the mode of low frequency - at the stage of technological processing of the melt. The ratio between the parameters of the furnace power supply in various operating modes are established.
Research of options for maintaining the operability of the traction switched reluctance motors in emergencies
Authors: Petrushin A , Smachney V , Petrushin D 
Published: November 2020

Abstract
The switched reluctance machines (SRM) in most cases of their application do not have a galvanic connection between the phase windings. It is widely known when one phase fails, SRM as a short circuit in the coil of one of the phases, the others continue to work. This gives you the ability to retain partial performance of the engine. This is especially important for transport systems: an electric car can drive to a depot on its own, and an electric car can drive to a service station. And for some transport systems, such as manned underwater vehicles, maintaining partial performance in emergency situations is a priority requirement-the life support of the crew depends on it.
For using a widely applied semi-bridge power supply scheme, the SRM with two transistors for each of the phases of the electric motor, it is not possible to maintain partial performance of the SRM if the only power source fails. To ensure the performance of the type, in the case of a short circuit in the source, a new power supply scheme for the SRM is proposed, containing one transistor for each of the phases of the engine (patent No. 2704494). Each phase is electrified charged from a separate source. For transport systems that have batteries in their composition, the total battery is divided into components by the number of phases. At the same time, the entire electrical circuit of the SRM phase, including the source, is backed up.
A simulation of the proposed new power supply circuit was performed in order to confirm its performance and evaluate its functionality. The analysis of the existing Converter circuits used for SRM is carried out, which allows to evaluate the advantages and disadvantages of the proposed circuit solution.
Technology and automation of low-temperature distributed induction heating in the oil and gas industry
Authors: Nikitin Yu. A. 
Published: November 2020

Abstract
Energy efficient electrotechnologies are one of the most promising areas of development of any industry. To improve the energy efficiency of the processes of keeping up the temperatures and heating technological facilities in the oil and gas industry by reducing electricity consumption, the development and introduction of modern technologies and equipment is needed of electroheating. To such means of electroheating includes low-temperature induction heating, which provides a guaranteed increase in quantitative and qualitative production indicators, which can significantly reduce the cost of production, which is important to save energy resources especially with increased tariffs. Various aspects of the development of such induction heating systems are discussed, with a particular focus on ensuring the safety and automation of installations used in the oil and gas industry. The issues of using distributed induction heating in the oil industry are considered using the example of the induction method for oil and gas producing wells with the aim of facilitating the production of highly viscous oil, eliminating tar-tar deposits and preventing the formation of hydrate-paraffin plugs. The results of modelling the heating of the inductor - tubing system at various positions of the load-bearing and non-load-carrying cable-inductor are presented. During the simulation, data were obtained on the temperature of the oil product were obtained under various oil production conditions.
The influence of electric current application configuration on the electro-vortex flow structure of conductive medium in cylindrical cell
Authors: Mandrykin S , Kolesnichenko I 
Published: November 2020

Abstract
A numerical study of the liquid metal electro-vortex flows (EVF) in a closed cylindrical cell, the radius of which is equal to its height, is performed. A direct current of 1000 A is applied through the electrodes at the bottom cylinder face, and is collected at the entire surface of the cylinder top end face. Various configurations of electrode location are considered. Namely, from one to five electrodes are placed on the cylinder bottom end face. The three-dimensional fields of the conducting medium flow velocity in the cell are obtained as a result of numerical simulations. The EVF is non-stationary in all considered regimes. In the one-electrode case, the flow is poloidal and is represented by one large-scale vortex. In the multielectrode case, the flow consists of multiple small-scale vortices, the size and quantity of which depend on the configuration of the electric current application. At the same electric current value of 1000 A, the mean flow velocity and characteristic frequency of the process are higher for the localized current application — 6.4 and 2.5 times respectively.
The methodology of MMF calculation in magnetic circuit of induction motor by “ANSYS Maxwell”
Authors: Tikhonova O V , Mineeva D D , Plastun A T 
Published: November 2020

Abstract
In the paper the methodology of MMF calculation in magnetic circuit of induction motor by “ANSYS Maxwell” is considered. The calculation is based on the use of the total current law. The magnetic circuit of the induction motor is divided into several sections: stator tooth, rotor tooth, air gap, stator yoke and rotor yoke. Each section of the circuit is analyzed separately. The calculation result obtained using “ANSYS Maxwell” is compared with the results of the classical methodology.
Prospects for the practical use of the Kaminskii thermovoltaic effect
Authors: Napoleao P A M , Costa S N , Vinogradov A A 
Published: November 2020

Abstract
The Kaminskii thermovoltaic effect, which is one of the new principles of converting thermal energy into electrical energy, is considered in the article. Samples of the rare-earth semiconductor samarium monosulfide (SmS), located in a uniform temperature field without any temperature gradient, generated an electromotive force (emf). The nature of the effect is associated with the concentration gradient of Sm impurity atoms in the sample, a combination of electronic and thermal processes at temperature about 200 °C, and the appearance of a concentration gradient of free electrons, which leads to the generation of emf. The following electrical characteristics of the effect were achieved on bulk samples: a 2.5 V emf in a pulsed mode with a pulse duration of 1.3 s and a 0.05 V emf in a continuous mode. The parameters of thermoelements based on the Kaminskii effect and based on the classical Seebeck thermoelectric effect were compared. The maximum values of the efficiency were 36 % and 10 %, respectively. The effect was observed on other semiconductors, however, its maximum values occur in SmS, which is explained by fundamental reasons related to the position of rare-earth elements in the periodic table. The thermovoltaic effect can be used for direct conversion of associated heat and utilization of waste heat as power sources for various devices.
The Association Between Impulsivity and Relapse in Patients With Alcohol Use Disorder: A Literature Review
Authors: Sliedrecht Wilco , Roozen Hendrik G , Witkiewitz Katie , de Waart Ranne , Dom Geert 
Published: November 2020

AbstractAimImpulsivity has been identified as a key relapse risk factor in patients with alcohol use disorder (AUD); however, the inherent characteristics of this relationship have been largely understudied. The heterogeneity of AUD and variation in impulsivity constructs require careful consideration to inform future work examining the relationship. This study sought to review empirical findings examining facets of impulsivity and AUD relapse.MethodsA systematic search strategy was employed to capture studies on impulsivity measures related to AUD relapse. Impulsivity measures were qualitatively organized in terms of ‘trait impulsivity’—typically measured by self-report questionnaires—and ‘behavioural impulsivity’, i.e. ‘motor impulsivity’, ‘impulsive choice’ and ‘reflection impulsivity, assessed with cognitive–behavioural tasks.ResultsSeventeen peer-reviewed papers were identified. Relapse outcomes varied substantially in relation to impulsivity measures. Twelve papers included aspects of ‘trait impulsivity’, and nine studies included ‘behavioural impulsivity’ measures, from which five studies dealt with the ‘impulsive choice’ subcategory. The Barratt Impulsivity Scale was the self-report questionnaire that was most frequently used.ConclusionsAll three included facets of impulsivity (‘trait-, motor- and impulsive choice impulsivity’) were associated with AUD relapse, but none seemed to be superior to another. This study confirmed that research on the relation between impulsivity and AUD relapse is relatively scarce. Future research and treatment options are proposed.