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Статті в журналах з теми "Electrical complex"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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1

Быкова, Валентина Прохоровна, and Valentina Prokhorovna Bykova. "Application of training and methodological complex Electrical Engineering." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2019, no. 4 (November 15, 2019): 130–40. http://dx.doi.org/10.24143/2073-1574-2019-4-130-140.

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The paper presents the laboratory practicum on electrical engineering and physics worked out on the basis of the teaching guide on electrical engineering including 5 test benches. It includes 24 laboratory works with elements of independent research. The detailed and illustrated test benches of the training complex are the following: Electrical Engineering and Electronics, Electric Machines and Electric Drive, Electric Machine Assembly, Electric Energy, its Transmission and Quality, Principles of Electrical Safety. Some stands are connected to a software and hardware complex designed for measuring the studied values, reflection and processing of analog signals. The compactness and versatility of the training complex Electrical Engineering are noted; one can do 6–9 laboratory works on electrical engineering and physics at one stand. Mathematical calculations of the readings are recommended to perform in Mathcad computer algebra system. A manual based on the laboratory works, which contains general safety rules, guidelines for per-forming tasks and requirements for their processing, is now under consideration. The advantages of the elaborated laboratory workshop have been listed; the educational, developmental, pedagogical tasks for solving at the lesson have been analyzed; a laboratory work “Three-phase circuit connection in star scheme” is given as an example. The diagram of a star connection is presented; a vector diagram of linear and phase voltages relations in a star connection is built. The oscillo-grams of currents under symmetrical load are illustrated. It has been noted that the individual tasks have an exploratory nature, they develop cognitive, independent and creative skills of students. The proposed methodological guidelines are recommended for specialists and bachelors in such areas as “Ship and Power Plants”, “Shipbuilding”, “Heat and Power Engineering and Heat Engineering”, etc., and can be used by teachers of general engineering disciplines

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2

Singh, Jagtar, and Pulak M. Pandey. "Process optimization for rapid manufacturing of complex geometry electrical discharge machining electrode." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 1 (September 12, 2019): 66–81. http://dx.doi.org/10.1177/0954406219874845.

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Rapid manufacturing techniques permit tools and dies to be fabricated in short duration of time with complex geometry. The major contribution of the present research was to fabricate copper complex geometry electric discharge machining electrode by using amalgamation of three-dimensional printing along with pressureless loose sintering. Response surface methodology was employed to study the sintering parameters’ (sintering temperature, heating rate and soaking time) effect on electric discharge machining electrode important characteristics such as density, shrinkage and electrical conductivity. Analysis of variance was used to investigate the significant contribution of the parameters on the responses. Density and electrical conductivity of fabricated electric discharge machining electrode were revealed to increase with respect to rise in soaking time and sintering temperature. The interaction between the heating rate and sintering temperature for density and electrical conductivity responses signified the less effect of heating rate at high temperatures. Further, multi-objective optimization was used to maximize density and electrical conductivity and to minimize volumetric shrinkage. Different shapes of electric discharge machining electrodes were fabricated at optimized parameters. In addition, the fabricated electrodes were tested on electric discharge machining of D2 steel for 5 mm depth. The dimensional analysis was carried out between the computer aided design (CAD) model, fabricated electric discharge machining electrode and the obtained cavity by electric discharge machining process. The results depicted high efficacy of the process to fabricate complex geometry electric discharge machining electrodes.

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3

Zhang, Yagang, Zengping Wang, and Jinfang Zhang. "Fault Identification Based on Nlpca in Complex Electrical Engineering." Journal of Electrical Engineering 63, no. 4 (July 1, 2012): 255–60. http://dx.doi.org/10.2478/v10187-012-0036-4.

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Fault Identification Based on Nlpca in Complex Electrical Engineering The fault is inevitable in any complex systems engineering. Electric power system is essentially a typically nonlinear system. It is also one of the most complex artificial systems in this world. In our researches, based on the real-time measurements of phasor measurement unit, under the influence of white Gaussian noise (suppose the standard deviation is 0.01, and the mean error is 0), we used mainly nonlinear principal component analysis theory (NLPCA) to resolve fault identification problem in complex electrical engineering. The simulation results show that the fault in complex electrical engineering is usually corresponding to the variable with the maximum absolute value coefficient in the first principal component. These researches will have significant theoretical value and engineering practical significance.

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4

Romanov, Vladimir, and Valery Goldstein. "Improving the Reliability of Electrical Engineering Complex of Submersible Electric Equipment of Oil Production Based on the Analysis of its Emergency." Electrotechnical Systems and Complexes, no. 3(40) (September 25, 2018): 20–26. http://dx.doi.org/10.18503/2311-8318-2018-3(40)-20-26.

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5

Iwai, Manabu, Shinichi Ninomiya, Tokiteru Ueda, and Kiyoshi Suzuki. "Electrical Discharge Truing of a Vitrified Bonded Superabrasive Wheel with Electrical Conductivity." Advanced Materials Research 591-593 (November 2012): 319–24. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.319.

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With its high grit retention and easiness to true and dress, the vitrified bond is widely used as a bond material for cBN and diamond grinding wheels. By giving electrical conductivity to the vitrified bond, application of electrical discharge trueing/dressing and detection of a workpiece position by electrical contact sensing will become possible. And moreover, application of the vitrified bonded wheels to various types of electro-assisted grinding processes (electrochemical or electro discharge assisted methods) is expected. In this study, vitrified bonded diamond segments with electrical conductivity were manufactured experimentally by mixing the fine copper powders in the vitrified bond matrix. As a result of investigation into the electro discharge trueing performance in the die sinking and wire electro discharge machining, it was found that a vitrified bonded wheel could be formed by electro discharge machining only because the bond was electrically conductive. In addition, the electro discharge complex grinding utilizing electric discharge machining was applied to the PCD cutting tool materials using the electrically conductive vitrified bonded wheel, and confirmed that the grinding could be continued for a long time maintaining a stable grinding force.

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6

Iwai, Manabu, Shinichi Ninomiya, Gaku Sugino, and Kiyoshi Suzuki. "Complex Grinding Assisted with Electrical Discharge Machining for Electrically Conductive PCD." Advanced Materials Research 126-128 (August 2010): 591–96. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.591.

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A new PCD material named EC-PCD (Electrically conductive polycrystalline composite diamond), which consists of electrically conductive diamond grits, has recently been developed. This paper deals with an investigation of a complex grinding assisted with electrical discharge machining (EDM) to realize high efficiency, low and stable grinding force and low wheel wear for the new EC-PCD. The effect of complex grinding assisted with EDM is compared experimentally with the standard PCD (S-PCD). The result shows that, in the complex grinding, lower and more stable grinding force is realized thanks to the material removal action in EDM and that lower wheel wear and better surface finish are attained, just when the EC-PCD is selected as a workpiece.

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7

Savenko, A. Е., and P. S. Savenko. "Research into powerful electric drives in the autonomous electrical power complex." Vestnik IGEU, no. 4 (2017): 44–49. http://dx.doi.org/10.17588/2072-2672.2017.4.044-049.

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8

Kamoun, S., and M. Gargouri. "Electrical conductivity and complex electric modulus of NaCuFe2(VO4)3 material." Ionics 21, no. 3 (August 19, 2014): 765–74. http://dx.doi.org/10.1007/s11581-014-1228-7.

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9

Parida, Kalpana, Sujit Kumar Dehury, and R. N. P. Choudhary. "Structural, electrical and magneto-electric characteristics of complex multiferroic perovskite Bi0.5Pb0.5Fe0.5Ce0.5O3." Journal of Materials Science: Materials in Electronics 27, no. 11 (June 28, 2016): 11211–19. http://dx.doi.org/10.1007/s10854-016-5241-7.

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10

Misra, S., C. Torres-Verdín, A. Revil, J. Rasmus, and D. Homan. "Interfacial polarization of disseminated conductive minerals in absence of redox-active species — Part 1: Mechanistic model and validation." GEOPHYSICS 81, no. 2 (March 1, 2016): E139—E157. http://dx.doi.org/10.1190/geo2015-0346.1.

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Анотація:

Electrically conductive mineral inclusions are commonly present in organic-rich mudrock and source-rock formations such as veins, laminations, rods, grains, flakes, and beds. Laboratory and subsurface electromagnetic (EM) measurements performed on geomaterials containing electrically conductive inclusions generally exhibit frequency dispersion due to interfacial polarization phenomena at host-inclusion interfaces. In the absence of redox-active species, surfaces of electrically conductive mineral inclusions are impermeable to the transport of charge carriers, inhibit the exchange of charges and behave as perfectly polarized (PP) interfaces under the influence of an externally applied EM field. Interfacial polarization phenomena involving charge separation, migration, accumulation/depletion, and relaxation around PP interfaces is referred to as PP interfacial polarization; it influences the magnitude and direction of the electric field and charge carrier migration in the geomaterial. We have developed a mechanistic model to quantify the complex-valued electrical conductivity response of geomaterials containing electrically conductive mineral inclusions, such as pyrite and magnetite, uniformly distributed in a fluid-filled, porous matrix made of nonconductive grains possessing surface conductance, such as silica and clay grains. The model first uses a linear approximation of the Poisson-Nernst-Planck equations of dilute solution theory to determine the induced dipole moment of a single isolated conductive inclusion and that of a single isolated nonconductive grain surrounded by an electrolyte. A consistent effective-medium formulation was then implemented to determine the effective complex-valued electrical conductivity of the geomaterial. Model predictions were in good agreement with laboratory measurements of multifrequency complex-valued electrical conductivity, relaxation time, and chargeability of mixtures containing electrically conductive inclusions.

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11

Shevchuk, V. N., and I. V. Kayun. "Electrical Charge Transfer in Complex Oxides." Acta Physica Polonica A 117, no. 1 (January 2010): 150–54. http://dx.doi.org/10.12693/aphyspola.117.150.

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12

Ray, C., G. Ruffini, J. Marco-Pallarés, L. Fuentemilla, and C. Grau. "Complex networks in brain electrical activity." Europhysics Letters (EPL) 79, no. 3 (July 16, 2007): 38004. http://dx.doi.org/10.1209/0295-5075/79/38004.

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13

Kremers, Mark S., John M. Miller, and Mark E. Josephson. "Electrical alternans in wide complex tachycardias." American Journal of Cardiology 56, no. 4 (August 1985): 305–8. http://dx.doi.org/10.1016/0002-9149(85)90854-9.

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14

Serebryakov, N. A. "Application of adaptive ensemble neural network method for short-term load forecasting electrical engineering complex of regional electric grid." Omsk Scientific Bulletin, no. 175 (2021): 39–45. http://dx.doi.org/10.25206/1813-8225-2021-175-39-45.

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Анотація:

The article is devoted to the problem of improving the accuracy of short-term load forecasting of electrical engineering complex of regional electric grid with the use deep machine learning tools. The effectiveness of the application of the adaptive learning algorithm for deep neural networks for short-term load forecasting of this electrical complex has been investigated. The issues of application of convolutional and recurrent neural networks for short-term load forecasting are considered. A comparative analysis of the accuracy of the short-term load forecasting of electrical engineering complex of regional electric grid obtained using the ensemble neural network method and single neural networks are produced

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15

Pahomov, Roman, Oleksandr Zyma, and Evgen Dyachenko. "Oil and gas complex of Ukraine: analysis and prevention of electrical traumatism." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 52 (July 5, 2019): 210–15. http://dx.doi.org/10.26906/znp.2019.52.1700.

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The work is devoted to the analysis of injury cases from the electric current influence on the oil and gas complex objects. Theprinciples, the main provisions of the system analysis and the classification of electric traumatism cases at power enterprisesare presented. Main causes and patterns of the electric trauma occurrence on dependence of the various production features,as well as for various categories of workers are determined in the article. The structural scheme of the relationship betweenthe elements of the system "man – electrical engineering – production environment" is given. A set of preventive measuresand practical recommendations that can be successfully applied to assess occupational risk and reduce the level of injuryfrom electric current in the energy sector of Ukraine is proposed.

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16

Barot, Dharmishtha, and Deepti Tripathi. "Dielectric and Electrical Studies of PMMA and PVP in Polar Solvents." Solid State Phenomena 209 (November 2013): 133–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.209.133.

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The dielectric and electric properties of poly (methyl Methacrylate) (PMMA) and Poly (vinyl Pyrrolidione) (PVP) in polar solvent have been studied in the frequency range of 20 Hz to 2 MHz at room temperature. The effect of polar solvent environment on the dielectric and electrical parameters such as the complex dielectric constant (Є*), relaxation times complex electrical modulus (M*) and complex impedance (Z*) has been analysed . Dielectric dispersion curves show that the polymer concentration plays an important role in governing its segmental motion in solvent solution. At low frequencies, the ionic conduction and electrode polarization seems to have dominant influence on the large increase of complex dielectric constant values.

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17

Anikin, V. V., V. Z. Kovalev, R. N. Khamitov, and V. O. Bessonov. "Study of asynchronous electric motors in the electrical complex of oil production." YOUNG RUSSIA: HIGH TECHNOLOGY – INTO INDUSTRY, no. 1 (2019): 024–28. http://dx.doi.org/10.25206/2310-4597-2019-1-24-28.

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18

Kaiser, M. "Electrical conductivity and complex electric modulus of titanium doped nickel–zinc ferrites." Physica B: Condensed Matter 407, no. 4 (February 2012): 606–13. http://dx.doi.org/10.1016/j.physb.2011.11.043.

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19

Vorzhev, Vladimir, Nikolay Rudenko, Pavel Malko, and Vladimir Dergousov. "Increasing the reliability of electrical equipment in the agricultural and industrial complex based on measuring the electrical capacitance of capacitors." E3S Web of Conferences 273 (2021): 07029. http://dx.doi.org/10.1051/e3sconf/202127307029.

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Анотація:

The article presents elaborated technical suggestions for increasing reliability of electrical equipment of agro-industrial complexes. The analysis of the already known ways of measuring electric capacitance is carried out and it demonstrates the necessity of withdrawing a capacitor from a working circuit for sufficient accuracy of determining electric capacitance. The urgency of developing a method for measuring electric capacitance without removing the capacitor from а working circuit to reduce the average recovery time is shown. Theoretical foundation of the possibility to measure electric capacitance without a capacitor being withdrawn from a working circuit in smoothing filter mode is worked out; a structural electric circuit of an electric capacitance measuring device is elaborated and the principle of its operation is described; methods of measurement by means of the given device are elaborated; conditions for creating and maintaining the measurement mode of the device are substantiated. The validity of the received results is checked with the help of the programmed package Mathcad, as well as on electric models of the main blocks of the device. The obtained results can be used to measure electric capacitance of electrolytic capacitors during maintenance and electrical equipment renovation and also can promote its reliability.

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20

Kostin, K. V., K. S. Kryukov, and I. Yu Lepeshinsky. "Diagnostic complex «Bort»." Omsk Scientific Bulletin, no. 177 (2021): 20–23. http://dx.doi.org/10.25206/1813-8225-2021-177-20-23.

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Анотація:

The article deals with the issue of checking the operability of electrical equipment of armored vehicles. This issue is relevant, due to the need to maintain constant combat readiness of armored vehicles. The system is saturated with automated and automatic systems for various purposes, while there is a problem of rapid troubleshooting in the operation of devices and electrical equipment systems. Existing diagnostic systems allow testing through diagnostic connectors or with a break in the supply circuit through adapters. The diagnostic complex discussed in the article will allow you to check the operation of consumers, blocks without disconnecting connectors

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21

Moses, A. J., J. Leicht, and P. Anderson. "Characterising electrical steels under complex magnetising conditions." Journal of Magnetism and Magnetic Materials 254-255 (January 2003): 54–56. http://dx.doi.org/10.1016/s0304-8853(02)00746-1.

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22

Cabane, Bernard. "Symposium on Electrical Interactions in Complex Fluids." Journal de Physique 49, no. 6 (1988): 991. http://dx.doi.org/10.1051/jphys:01988004906099100.

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23

Tra, Vu Thanh, Jan-Chi Yang, Ying-Hui Hsieh, Jiunn-Yuan Lin, Yi-Chun Chen, and Ying-Hao Chu. "Controllable electrical conduction at complex oxide interfaces." physica status solidi (RRL) - Rapid Research Letters 8, no. 6 (May 30, 2014): 478–500. http://dx.doi.org/10.1002/pssr.201409156.

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24

Frederickson, A. R., L. Levy, and C. L. Enloe. "Radiation-induced electrical discharges in complex structures." IEEE Transactions on Electrical Insulation 27, no. 6 (1992): 1166–78. http://dx.doi.org/10.1109/14.204868.

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25

Padhee, R., and Piyush R. Das. "Electrical properties of complex tungsten bronze ceramics." Phase Transitions 87, no. 9 (June 18, 2014): 865–80. http://dx.doi.org/10.1080/01411594.2014.914512.

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26

Kavian, M., E. C. Slob, and W. A. Mulder. "A new empirical complex electrical resistivity model." GEOPHYSICS 77, no. 3 (May 1, 2012): E185—E191. http://dx.doi.org/10.1190/geo2011-0315.1.

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Анотація:

Macroscopic measurements of electrical resistivity require frequency-dependent effective models that honor the microscopic effects observable in macroscopic measurements. Effective models based on microscopic physics exist alongside with empirical models. We adopted an empirical model approach to modify an existing physical model. This provided a description of electrical resistivity as a function of not only frequency, but also water saturation. We performed two-electrode laboratory measurements of the complex resistivity on a number of fine and medium-grained unconsolidated sand packs saturated with water of three different salinities. For frequencies between 0.1 and 1 MHz, the data were fitted with the new model and compared to fits with Archie’s law. Our model described the relaxation times and DC resistivity values as negative exponential functions with increasing water saturation. All data could be accurately described as a function of frequency and water saturation with nine parameters.

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27

Weller, A., M. Seichter, and A. Kampke. "Induced-polarization modelling using complex electrical conductivities." Geophysical Journal International 127, no. 2 (November 1996): 387–98. http://dx.doi.org/10.1111/j.1365-246x.1996.tb04728.x.

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28

Avouris, N. M., R. N. Allan, and M. Lagoudakos. "Modular graphic representation of complex electrical networks." International Journal of Electrical Power & Energy Systems 15, no. 5 (January 1993): 323–32. http://dx.doi.org/10.1016/0142-0615(93)90054-q.

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29

Smolyarenko, V. D., Yu S. Bruman, and A. V. Stolyarenko. "Modern electrical steelmaking complex — An attractive investment." Metallurgist 42, no. 2 (March 1998): 41–48. http://dx.doi.org/10.1007/bf02765087.

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30

Balalaiev, Vyacheslav, and Olena Fedoseenko. "DEVELOPMENT AND MODELLING OF HIGH SPREAD CONDUCTIVITY EARTH ELECTRODES FOR COMPLEX EARTHING ARRANGEMENTS." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (2) (July 2, 2021): 16–22. http://dx.doi.org/10.20998/2224-0349.2021.01.03.

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Анотація:

The analysis of methods for calculating the electrical characteristics of earth electrodes in case of emergency currents of industrial frequency flowing through the elements of earthing arrangements is carried out. A method for improving complex earthing arrangements of electrical installations by optimization of their design parameters is proposed. The proposed method consists in installing an artificial earth electrode with an increased contact area of its surface with the ground, which makes it possible to increase the conductivity of earthing spreading. The use of these electrodes on the territory of projected or operating electrical installations ensures that the values of the normalized parameters of earthing arrangements are brought to permissible values. The use of the method given in the calculations of earthing arrangements requires the replacement of volumetric earth electrodes with a set of linear vertical electrodes. The design model is substantiated by equivalent electrical characteristics relative to the two-layer model of the electrical structure of the earth. The equivalent model was obtained by a given approximation of the electrical characteristics of a set of straight electrodes in the process of increasing their number to the equivalent characteristics of the reference model. In turn, the determination of the characteristics of the reference model was carried out directly by solving the boundary value problem for the potential satisfying Laplace equation using finite difference method. Theoretical investigations using induced potential method and methods of calculation of branched electric circuits with distributed parameters for calculation of electric field and resistance of the complex non-equipotential earth electrode in the ground with two-layer structure have been carried out. The developed electrodes of increased spread conductivity are mounted as experimental samples and are involved in the formation of the electrical characteristics of the earthing arrangements.

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31

Dzyuba, A. P., and L. A. Soloveva. "Electrical energy demand management in Russia." Strategic decisions and risk management, no. 1 (May 25, 2018): 72–79. http://dx.doi.org/10.17747/2078-8886-2018-1-72-79.

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Анотація:

One of the modern and effective tools for energy efficiency improvement at the level of national economies is management of the demand for electrical energy consumption. The mechanism of management of the demand for electrical energy consumption has a significant potential for energy efficiency improvement for the Russian economy, but due to structural features of the Unified Energy System of Russia, the Electrical Energy Demand Management Program is at the stage of concept development. A model of management of the demand for electrical energy consumption for Unified Energy System of Russia has been developed taking into account structural features of the electric power system. Peculiarities of the economic structure of Russia, which influence the formation of the structure of the country’s electric power complex, have been revealed. They were taken into account when developing requirements for the electrical energy demand management system in the Unified Energy System of Russia. The basic features are the multilevel form and hierarchy of the structure; they have been investigated in the process of developing the demand management model. The classification of electric power industry entities, related to processes of electric energy circulation and the influence on the management of the demand for electrical energy consumption, has been developed with economic interests of each entity within the framework of the demand management model. The electrical energy demand management model, which is based on the hierarchical structure of demand management, has been developed and covers the whole complex of management functions and takes into account features of demand management at each management level. The model allows to significantly improve the efficiency of management of the demand for electrical energy consumption, to ensure the quality of management.

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32

Gilev, Sergey D., and Vladimir S. Prokopiev. "Electrical Resistivity of Aluminum under Shock Compression." Siberian Journal of Physics 16, no. 1 (2021): 101–8. http://dx.doi.org/10.25205/2541-9447-2021-16-1-101-108.

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Анотація:

Electrical resistance measurements of aluminum foil are conducted under shock compression using the electric contact technique. Shock wave pressure p dependences of the electrical resistance R and the resistivity r are obtained for pressure range up to 22 GPa. The found dependence R(p) is a monotonically increasing smooth function of the pressure. The dependence r(p) is more complex: with increasing pressure, the electrical resistivity first decreases and then increases.

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33

Karadaş, Seda, Seçkin Altındal Yerişkin, Muzaffer Balbaşı, and Yashar Azizian-Kalandaragh. "Complex dielectric, complex electric modulus, and electrical conductivity in Al/(Graphene-PVA)/p-Si (metal-polymer-semiconductor) structures." Journal of Physics and Chemistry of Solids 148 (January 2021): 109740. http://dx.doi.org/10.1016/j.jpcs.2020.109740.

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34

DUTTA, A., and T. P. SINHA. "DIELECTRIC RELAXATION IN COMPLEX PEROVSKITE BaFe1/2Sb1/2O3." International Journal of Modern Physics B 21, no. 17 (July 10, 2007): 2965–78. http://dx.doi.org/10.1142/s0217979207037454.

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Анотація:

The complex perovskite oxide barium iron antimonate, BaFe 1/2 Sb 1/2 O 3 (BFS) is synthesized by a solid-state reaction technique for the first time. The X-ray diffraction of the sample at room temperature shows a monoclinic phase. The field dependences of dielectric response and the loss tangent of the sample are measured in a frequency range from 50 Hz to 1 MHz and in a temperature range from 143 to 463 K. An analysis of the loss factor with frequency is performed by the scaling behavior of the dielectric loss spectra. The frequency dependence of the loss peaks are found to obey the Arrhenius law with an activation energy ≃0.81 eV . The scaling behavior of the dielectric loss spectra suggests that the distribution of relaxation times is temperature-independent. The frequency-dependent electrical data are also analyzed in the framework of conductivity and electric modulus formalisms. The scaling behavior of the imaginary electric modulus shows the temperature-independent nature of the distribution of relaxation times. All these formalisms resulted in the qualitative similarities in the relaxation time. The relationship between relaxation parameters and electrical conduction indicates the hopping motion of electrons from Fe(II) to Fe(III) ions in BFS.

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35

Masaev, S. Kh, U. Kh Makaev, and M. V. Debiev. "The basic stages of improving the power grid complex functioning of the Chechen Republic." Power engineering: research, equipment, technology 22, no. 4 (November 15, 2020): 43–53. http://dx.doi.org/10.30724/1998-9903-2020-22-4-43-53.

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The article considers the state of the electric power industry functioning of the Chechen Republic. Comparative data on the reception in the network and useful electricity supply of the Chechen Republic in recent years are presented. The total transformer capacity structure of all substations, as well as the power lines total length of Chechenenergo JSC, is considered. The main electric power industry problems of the Chechen power system, which are the lack of own generating capacities, the transformer capacities shortage of substations 110 and 35 kV and the main production assets high level wear of the electric grid economy, are studied. The tasks to reduce the Chechen energy system electric energy losses are considered. The values and causes of the electric energy losses in different district electric networks (RES) of JSC "Chechenenergo" are determined. A comparative analysis of the electrical energy losses in recent years has been performed. Issues related to reactive power in electrical networks are considered. An analysis was carried out to determine the reactive power values in different district electric networks of Chechenenergo JSC. Measures are proposed that contribute to the reactive power normalization and the improvement of technical and economic indicators in electric networks. The networks electrical circuits improvement analysis was carried out to ensure the power supply stability and reliability to consumers in the republic. The production process control system and diagnostics is proposed, which will allow to regulate and coordinate the activities to manage the technical condition, as well as the power system reliability.

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36

Yakovlev, Grigory, Černý Vít, Irina Polyanskikh, Anastasiya Gordina, Igor Pudov, Alexander Gumenyuk, and Olga Smirnova. "The Effect of Complex Modification on the Impedance of Cement Matrices." Materials 14, no. 3 (January 24, 2021): 557. http://dx.doi.org/10.3390/ma14030557.

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The research results presented in this article were obtained by joint scientific research on creatingcement materials with reduced impedance. It is known that functional additives added to impart electrically conductive properties have a negative impact on physical and mechanical characteristics of the material. This study suggests using the multiwall carbon nanotubes in the amount of 7% from binder mass as a functional additive. The results obtained prove that the addition of this amount of the modifier does not lead to a significant decrease of strength characteristics. Calcium nitrate in the amount of 1–7% was added in order to level the strength loss and to ensure the effective stable electrical conductivity. The multifunctionality of using this salt has been proven, which is manifested in the anti-frost and anticorrosive effects as well in enhancement of electrical conductivity. The optimal composition of the additive with 7% of carbon nanotubes and 3% of calcium nitrate ensures a reduced electrical impedance of cement matrix. The electrical conductivity was 2440 Ohm, while the decrease of strength properties was within 10% in comparison tothe control sample. The nature of changes in the microstructure were studied to determine the influence of complex modifications that showed significant changes in the morphology of the hydration products. The optimum electrical characteristics of cementitious materials are provided due to the uniform distribution of carbon nanotubes and the formation of a network of interconnected micropores filled with the solution of calcium nitrate that provides additional and stable electrical conductivity over time.

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37

Budelli, R., and A. A. Caputi. "The electric image in weakly electric fish: perception of objects of complex impedance." Journal of Experimental Biology 203, no. 3 (February 1, 2000): 481–92. http://dx.doi.org/10.1242/jeb.203.3.481.

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Weakly electric fish explore the environment using electrolocation. They produce an electric field that is detected by cutaneous electroreceptors; external objects distort the field, thus generating an electric image. The electric image of objects of complex impedance was investigated using a realistic model, which was able to reproduce previous experimental data. The transcutaneous voltage in the presence of an elementary object is modulated in amplitude and waveform on the skin. Amplitude modulation (measured as the relative change in the local peak-to-peak amplitude) consists of a ‘Mexican hat’ profile whose maximum relative slope depends on the distance of the fish from the object. Waveform modulation depends on both the distance and the electrical characteristics of the object. Changes in waveform are indicated by the amplitude ratio of the larger positive and negative phases of the local electric organ discharge on the skin. Using the peak-to-peak amplitude and the positive-to-negative amplitude ratio of this discharge, a perceptual space can be defined and correlated with the capacitance and resistance of the object. When the object is moved away, the perceptual space is reduced but keeps the same proportions (homothetically): for a given object, the positive-to-negative amplitude ratio is a linear function of the peak-to-peak amplitude. This linear function depends on the electrical characteristics of the object. However, there are ‘families’ of objects with different electrical characteristics that produce changes in the parameters of the local electric organ discharge that are related by the same linear function. We propose that these functions code the perceptual properties of an object related to its impedance.

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38

Strkalj, Nives, Elzbieta Gradauskaite, Johanna Nordlander, and Morgan Trassin. "Design and Manipulation of Ferroic Domains in Complex Oxide Heterostructures." Materials 12, no. 19 (September 24, 2019): 3108. http://dx.doi.org/10.3390/ma12193108.

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The current burst of device concepts based on nanoscale domain-control in magnetically and electrically ordered systems motivates us to review the recent development in the design of domain engineered oxide heterostructures. The improved ability to design and control advanced ferroic domain architectures came hand in hand with major advances in investigation capacity of nanoscale ferroic states. The new avenues offered by prototypical multiferroic materials, in which electric and magnetic orders coexist, are expanding beyond the canonical low-energy-consuming electrical control of a net magnetization. Domain pattern inversion, for instance, holds promises of increased functionalities. In this review, we first describe the recent development in the creation of controlled ferroelectric and multiferroic domain architectures in thin films and multilayers. We then present techniques for probing the domain state with a particular focus on non-invasive tools allowing the determination of buried ferroic states. Finally, we discuss the switching events and their domain analysis, providing critical insight into the evolution of device concepts involving multiferroic thin films and heterostructures.

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39

Allaev, K. R., and T. F. Makhmudov. "Analysis of small oscillations of complex electrical systems." E3S Web of Conferences 216 (2020): 01097. http://dx.doi.org/10.1051/e3sconf/202021601097.

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The article discusses the results of the analysis of the static stability of complex electrical systems. The efficiency of the combined application of the equations of nodal voltages (ENV) and the Lyapunov function in quadratic form for the analysis of small oscillations of the electrical system is shown in the literature, which is called the Allaev method. A joint solution of the equations of nodal voltages and the matrix Lyapunov equation is given, which makes it possible to determine the stability conditions for the electrical system and identify the generator first approaching the stability limit. A study of small oscillations of complex electrical systems, which can be performed in full on the basis of matrix methods, successfully developed in recent decades, is carried out, which is associated with a sharp increase in the speed of computation and the amount of memory of modern computers.

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40

Reljin, Branimir, Slavica Ristić, and Milesa Srećković. "Analysis of Some Physical Phenomena and Processes by Equivalent Electrical Circuits." International Journal of Electrical Engineering & Education 33, no. 4 (October 1996): 353–72. http://dx.doi.org/10.1177/002072099603300407.

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Analysis of some physical phenomena and processes by equivalent electrical circuits Electric circuit analysis is a very powerful tool solving many complex problems. Consequently, most non-electrical problems can be efficiently resolved if they are modelled, first, by appropriate electric circuits. In this paper some physical phenomena (in thermodynamics, optics and dynamics of fluids) are chosen to illustrate the above statement. The modelling procedure exposed can also be extended to other problems in science.

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41

Lysiak, Vladyslav, Mykhailo Oliinyk, and Yurii Shelekh. "Modeling of Hydraulic Load of Electric Drive in Electrical Complex of Pumping Station." Energy Engineering and Control Systems 4, no. 1 (2018): 31–36. http://dx.doi.org/10.23939/jeecs2018.01.031.

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42

Kucheriava, I. M. "COUPLED ELECTRICAL AND MECHANICAL PROCESSES IN POLYETHYLENE INSULATION WITH WATER TREE HAVING BRANCHES OF COMPLEX STRUCTURE." Tekhnichna Elektrodynamika 2016, no. 5 (September 6, 2016): 5–10. http://dx.doi.org/10.15407/techned2016.05.005.

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43

ÖZAYDIN, Cihat, TOMBAK, Mehmet BOĞA, and Tahsin KILIÇOĞLU. "OPTICAL, ELECTRICAL AND PHOTOELECTRICAL PROPERTIES OF QUERCETIN-CO(II) COMPLEX/N-SI ORGANIC-INORGANIC HYBRID DEVICE." Middle East Journal of Science 1, no. 2 (December 29, 2015): 15–27. http://dx.doi.org/10.23884/mejs.2015.1.2.01.

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44

Borozdin, M. K., S. S. Nepochatov, and N. O. Primachenko. "IMPROVEMENT OF DRILLING RIG ELECTRICAL EQUIPMENT." Системи управління, навігації та зв’язку. Збірник наукових праць 1, no. 59 (February 26, 2020): 12–14. http://dx.doi.org/10.26906/sunz.2020.1.012.

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The article describes the electrical complex of a modern electric drilling rig. The structure of electrical complexes is caused by a wide range of requirements for the drilling depth, purpose and operating conditions of the drilling rig. The issue of the direct use of the engine, namely, the conversion of various types of energy into mechanical energy, is also considered. Today, in leading industries, the ratio of the installed capacity of electric drives to the total installed capacity of drives with engines of all types (Thermal, hydraulic, pneumatic) is approaching 100%. This is determined by the fact that electric motors are manufactured for various capacities (from hundredths of a watt to tens of thousands of kilowatts) and rotational speeds

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45

Saltas, Vassilios, Despoina Pentari, and Filippos Vallianatos. "Complex Electrical Conductivity of Biotite and Muscovite Micas at Elevated Temperatures: A Comparative Study." Materials 13, no. 16 (August 9, 2020): 3513. http://dx.doi.org/10.3390/ma13163513.

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The unique physicochemical, electrical, mechanical, and thermal properties of micas make them suitable for a wide range of industrial applications, and thus, the interest for these kind of hydrous aluminosilicate minerals is still persistent, not only from a practical but also from a scientific point of view. In the present work, complex impedance spectroscopy measurements were carried out in muscovite and biotite micas, perpendicular to their cleavage planes, over a broad range of frequencies (10−2 Hz to 106 Hz) and temperatures (473–1173 K) that have not been measured so far. Different formalisms of data representation were used, namely, Cole-Cole plots of complex impedance, complex electrical conductivity and electric modulus to analyze the electrical behavior of micas and the electrical signatures of the dehydration/dehydroxylation processes. Our results suggest that ac-conductivity is affected by the structural hydroxyls and the different concentrations of transition metals (Fe, Ti and Mg) in biotite and muscovite micas. The estimated activation energies, i.e., 0.33–0.83 eV for biotite and 0.69–1.92 eV for muscovite, were attributed to proton and small polaron conduction, due to the bound water and different oxidation states of Fe.

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46

Gorodnov, A. G. "Design of energy efficient electrotechnical complexes with an autonomous electric supply system." Power engineering: research, equipment, technology 22, no. 4 (November 15, 2020): 64–78. http://dx.doi.org/10.30724/1998-9903-2020-22-4-64-78.

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Improving energy efficiency and reducing the costs of creating an autonomous power supply complex for an oil production enterprise is an urgent problem and requires a rational solution. At each stage of the electrical complex development of the oil production enterprise, the purpose is to increase energy efficiency in order to reduce the unit cost of electricity per unit of produced well fluid volume. The electrical complex energy efficiency assessment of the oil production enterprise can be determined by the classical methodology of the energy balance. The task of increasing the energy efficiency of the electrical complex with an autonomous power supply system is to ensure a minimum of fuel costs while maintaining current oil production. Two types of the electrical complex models are proposed: with an individual electricity source and a generation center based on individual diesel generators. A method for calculating the energy parameters of the electrical complex components with installations of different types of pumps is presented. In this case, the energy efficiency is improved due to joint deep and group reactive power compensation and power factor correction by reducing the harmonic components of the current. The electrical complex simulation of a submersible electric motor has been carried out in order to determine the values of voltage and current during switching processes. The autonomous power supply system modeling of an oil production enterprise in case of voltage losses and the simulation of diesel generators with a frequency deviation of the generated voltage during load surges was carried out.

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47

Kobayashi, Takaki, Akiomi Ushida, and Taisuke Sato. "Pseudo-Laminarization of Mixed Microbubble Water and Complex Fluids in Capillary Flows." Symmetry 13, no. 7 (June 25, 2021): 1141. http://dx.doi.org/10.3390/sym13071141.

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Symmetry in fluid flow is determined by external factors such as magnetic or electric fields. Owing to the electrical properties of fluids, liquids containing fine bubble or ionic surfactant molecules differ from the normal fluid flow. Therefore, the pressure drop and frictional coefficient in a pipe are measured and estimated for water alone, for mixed microbubble water (MB), and for complex fluids (anionic surfactant solution and polymer solution) in capillary flow with constant flow rate. For water alone, good agreement is obtained between the experimental and theoretical values for laminar Hagen–Poiseuille flow and the Blasius expression in turbulent flow. For the MB, pseudo-laminarization is suggested up to a Reynolds number of 4.2×103. Both the anionic surfactant solution and the polymer solution exhibit the same tendency as that of the MB. In explaining these behaviors, elasticity and electrical interaction are discussed, and electrical interaction on the capillary wall is strongly suggested to be a contributing factor. Additionally, surface tension is investigated and supports the discussion.

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48

Bykova, Valentina Prokhorovna. "Electrotechnical complex for distance learning." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 2 (May 31, 2021): 109–19. http://dx.doi.org/10.24143/2073-1574-2021-2-109-119.

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The article identifies the difficulties arising from distant training of electro-engineering disciplines, in particular, when conducting laboratory work on the course of physics, electrical engineering and electronics. The advantages and prospects of technical means in education have been analyzed. The achievements of high-quality distance learning based on a computer laboratory of the educational and methodological electrical installation complex have been listed. Functioning of a computer laboratory supposes a connection between the server and the computers of the students and the teacher. One of the ways to implement distance learning using computer technologies when performing laboratory work on electrical disciplines has been presented. There has been considered an algorithm for solving graphical and computational tasks by using experimental data obtained when working with the test bench “Electrical Energy and Electronics”. There have been illustrated the diagrams of an AC rectifier diode, a parametric stabilizer of the electrical circuit voltage on the laboratory bench; the graphs of the current-voltage characteristics of an ideal semiconductor and real diodes, a Schottky diode, a silicon diode at different temperatures, a Zener diode. A diagram of the dependence of semiconductor band gap on temperature is presented. It has been inferred that the students must be IT competent before studying special subjects, in particular, physics and mathematics (specialist’s course “Ship Power plants and Automatic Equipment Operation”; Bachelor’s courses “Shipbuilding”, “Ship Power Plants”), as one of the areas of their professional activities is design and modernization of ships and marine equipment and automation, as well as the analysis of operational characteristics of power plants, which is impossible without special software and technologies. The proposed methods of conducting the laboratory work will prepare the trainees for solving the professional problems.

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49

Shmelyov, Yurii, Serhii Boiko, Oleksiy Gorodny, Olena Chernikova, and Serhii Vladov. "ELECTRICAL ENGINEERING COMPLEX FOR STATUS OF AVIATION BATTERIES." TECHNICAL SCIENCES AND TECHNOLOG IES, no. 4(10) (2017): 123–32. http://dx.doi.org/10.25140/2411-5363-2017-4(10)-123-132.

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50

Littmann, Laszlo. "Wide QRS complex rhythm with pulseless electrical activity." Cleveland Clinic Journal of Medicine 81, no. 2 (February 2014): 81–82. http://dx.doi.org/10.3949/ccjm.81a.13079.

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