scholarly journals ELECTROMAGNETIC PROCESSES IN A FLAT RECTANGULAR SYSTEM WITH AN INDUCTOR BETWEEN THIN BIFILAR COILS

2021 ◽  
Vol 2021 (1) ◽  
pp. 3-9
Author(s):  
Yu.V. Batygin ◽  
◽  
S.O. Shinderuk ◽  
O.F. Yeryomina ◽  
E.A. Chaplygin ◽  
...  
Keyword(s):  
Magnetic Pulse ◽  
Induced Current ◽  
Analysis And Evaluation ◽  
Electromagnetic Processes ◽  
Time Shape ◽  
Wide Range ◽  
Induced Currents ◽  
Metal Processing ◽  
Induced Signal ◽  
Practical Recommendations

The aim of the research is the analysis and evaluation of the electromagnetic processes characteristics in the proposed flat rectangular system consisting of a thin solenoid-inductor located between the branches of the bifilar, thin-walled multi-turn coils. The analysis of electromagnetic processes and the obtained estimates of the excited currents are carried out. It is shown that with a minimum gap between the windings of the solenoid-inductor and the bifilar, the time functions of the exciting current and the current induced in the bifilar windings are the same, and the amplitude of the latter is maximum and equal to half the current amplitude in the inductor. It was found that the proposed system has a practical invariance of the time shape and amplitude of the induced current in a wide range of variable geometric parameters. The minimal effect of the fields of induced currents on the processes in the solenoid-inductor and the minimum losses when removing the induced signal from the bifilar windings are noted. Physically, the first is due to the asymmetry of the excited magnetic field relative to the plane of the solenoid-inductor, the second is due to a significant decrease in spurious inter-turn capacitance due to the thinness of the bifilar windings. The obtained results allow us to give practical recommendations when choosing design solutions for elements of new circuits of equipment for magnetic pulse metal processing. References 14, figures 2.

scholarly journals Mutual influence of currents in plane inductor system with solenoid between two massive conductors

2021 ◽  
pp. 25-30
Author(s):  
Yu.V. Batygin ◽  
S.O. Shinderuk ◽  
E.O. Chaplygin
Keyword(s):  
Theoretical Analysis ◽  
Mutual Influence ◽  
Practical Significance ◽  
Magnetic Pulse ◽  
Electromagnetic Processes ◽  
Induced Currents ◽  
Pulsed Electromagnetic ◽  
Physical And Mathematical Models ◽  
First Time ◽  
System Methodology

Introduction. Inductor systems, as tools for metal processing, widely used in industrial  technologies  using the energy of powerful pulsed electromagnetic fields. Problem. A common disadvantage of the known works on the creation of tools for magnetic-pulse impact on conductive objects has the use of physical and mathematical models, in which the exciting currents do not depend on the ongoing electromagnetic processes. Such the assumption, have distorts the picture of the real energy in the working area of the inductor system. Goal. To obtain design ratios and numerical estimates of the mutual influence of exciting and induced currents of a flat inductor system with a circular solenoid located between massive well-conducting objects, moreover to carry out a theoretical analysis of electromagnetic processes in this system. Methodology. Have applied integrating Maxwell’s equations using the Laplace and Fourier-Bessel integral transformations in the approximation of the ideal conductivity of the metal objects to be processed. Results. The calculated relations for the theoretical analysis of electromagnetic processes have obtained in the high-frequency approximation. It shown that the inductance of the studied system decreases as the objects being processed approach the solenoid and increases as they move away from it. It found that for the invariability of the power indicators, of the proposed tool, a corresponding correction of the amplitude (on average up to 20 times) of the exciting current has necessary in the solenoid winding. Originality. For the first time, the tool design with a circular solenoid located between the massive metal objects has proposed for flat magnetic-pulse stamping. As a result of the theoretical analysis, the influence of electromagnetic processes on the currents flowing in the system has confirmed. Practical significance. The use of the results obtained will allow to increase the efficiency of the tool of magnetic-pulse technologies, and to reduce the energy costs for performing the specified production operations.

scholarly journals FLAT CIRCULAR SOLENOID BETWEEN MASSIVE BIFILAR COILS. ANALYSIS OF ELECTROMAGNETIC PROCESSES

2021 ◽  
pp. 3-8
Author(s):  
Yuriy Batygin ◽  
Olena Yeryomina ◽  
Svitlana Shinderuk ◽  
Evgeniy Chaplygin ◽  
Badr Eddin Bensbaa
Keyword(s):  
Time Dependence ◽  
Low Frequency ◽  
Frequency Mode ◽  
Maximum Efficiency ◽  
Induced Current ◽  
Transverse Distribution ◽  
Exciting Current ◽  
Electromagnetic Processes ◽  
Induced Currents ◽  
Low Frequency Mode

An analysis and numerical estimates of induction effects in the metal of a flat circular solenoid located between the branches of an external bifilar coil in a flat inductor system excited by unidirectional currents in the bifilar windings are presented. Such a device, the design of which was first proposed earlier by the authors of this work, is of practical interest for circuits of equipment for magnetic-pulse processing of metals. The use of the considered inductor system makes it possible to minimize the influence of induction effects on electromagnetic processes in the metal of the internal inductor. Numerical estimates are obtained for the induced currents excited in the metal of the inner circular inductor placed between the outer windings of the bifilar coil. It is shown that in the low-frequency mode of acting fields, the time dependence of the excited current is a derivative of the time dependence of the exciting current and the transverse distribution of the current in the metal of the internal inductor is a linear dependence passing through the central axis of the inductor. In the high-frequency regime of acting fields, the time dependence and the radial distribution of the excited current coincide with the corresponding analogs for the exciting current, and the transverse distribution of the induced current is characteristic of a sharp surface effect, when the induced current is displaced to the boundary surfaces of the metal. It is proved that the minimum influence of the fields of the external bifilar on the electromagnetic processes in the internal inductor should be observed in the low-frequency mode, when the spatial superposition of multidirectional induced currents adds up to the zero value of the excited electromotive force of induction. The results of the analysis based on the specific calculations performed are aimed at finding the conditions for the successful technical implementation of the proposed inductor system. The creation of workable models of the proposed inductor systems and experiments to determine the real conditions for their maximum efficiency are seen as very promising in the direction of subsequent research.

Radiation-Induced Currents in 4H-SiC Dosimeters for Real-Time Gamma-Ray Dose Rate Monitoring

2014 ◽  
Vol 778-780 ◽  
pp. 1042-1045 ◽  
Author(s):  
Natsuko Fujita ◽  
Naoya Iwamoto ◽  
Shinobu Onoda ◽  
Takahiro Makino ◽  
Takeshi Ohshima
Keyword(s):  
Silicon Carbide ◽  
Dose Rate ◽  
Gamma Rays ◽  
High Purity ◽  
Gamma Ray ◽  
Induced Current ◽  
Wide Range ◽  
Radiation Induced ◽  
Induced Currents ◽  
Aluminum Electrodes

In order to test the response of radiation-induced current with wide range of dose rate, a Silicon Carbide (SiC) dosimeter is exposed to gamma-rays emitted from a60Co source. The SiC dosimeter in this study is made of a high purity semi-insulating 4H-SiC with nickel and aluminum electrodes. We have successfully demonstrated that the radiation-induced currents in the dosimeter show a linear relationship with the dose rate, and are repeatable and stable.

scholarly journals ELECTROMAGNETIC PROCESSES IN A SYSTEM WITH A PLANE CIRCULAR SOLENOID BETWEEN MASSIVE BIFILARY COILS

2021 ◽  
Vol 3 (55) ◽  
pp. 8-14
Author(s):  
Yu. Batygin ◽  
◽  
T. Gavrilova ◽  
Ev. Chaplygin ◽  
S. Shinderuk ◽  
...  
Keyword(s):  
Exact Solution ◽  
Surface Effect ◽  
Finite Thickness ◽  
Low Frequency ◽  
Frequency Mode ◽  
Maximum Efficiency ◽  
Magnetic Pulse ◽  
Induced Current ◽  
Transverse Distribution ◽  
Electromagnetic Processes

Purpose. Currently, in order to save materials and energy costs, devices have been developed using inductor systems with bifilar coils used in equipment for magnetic-pulse processing of metals. The purpose of this work is to obtain design relations based on a rigorous solution of the edge electrodynamics for the analysis of electromagnetic processes in a real metal of a circular solenoid of finite thickness placed between massive multi-turn coils of a bifilar with unidirectional currents in a flat inductor system. Methodology. To solve this problem, Maxwell’s equations with appropriate boundary conditions and Laplace transforms were used. Results. Based on the exact solution of the boundary value problem, the space-time function of the density of the induced current, which arises in a flat solenoid when the system is excited by harmonic unidirectional currents in massive bifilar windings, is obtained. On the basis of numerical calculations, it was found that in the low-frequency mode, the transverse distribution of the induced current is linear, symmetric about the central axis of the inductor. In the high-frequency mode, the transverse distribution of the induced current is characteristic of the case of a sharp surface effect. The conditions for the minimum influence of the fields of the external bifilar on the processes in the internal inductor are revealed. Originality. The novelty of this work lies in proposing the idea of the design of the inductor system, as well as in the exact solution of the electrodynamics problem and obtaining the calculated expressions for the analysis of electromagnetic processes. Practical value. On the basis of the obtained formulas and the performed calculations, the efficiency of the proposed calculation model has been proved, which makes it possible to use it as a basic model for similar inductor systems in determining the real conditions of their maximum efficiency. Figures 2, references 17.

Intense dB/dt variations driven by near-Earth Bursty Bulk Flows (BBFs): A case study

2021 ◽  
Author(s):  
Dong Wei ◽  
Malcolm Dunlop ◽  
Junying Yang ◽  
Xiangcheng Dong ◽  
Yiqun Yu ◽  
...  
Keyword(s):  
Large Scale ◽  
Current System ◽  
Geomagnetically Induced Currents ◽  
Inner Magnetosphere ◽  
Wide Range ◽  
Ground System ◽  
Induced Currents ◽  
Ground Magnetic ◽  
Bursty Bulk Flows

<p>During geomagnetically disturbed times the surface geomagnetic field often changes abruptly, producing geomagnetically induced currents (GICs) in a number of ground based systems. There are, however, few studies reporting GIC effects which are driven directly by bursty bulk flows (BBFs) in the inner magnetosphere. In this study, we investigate the characteristics and responses of the magnetosphere-ionosphere-ground system during the 7 January 2015 storm by using a multi-point approach which combines space-borne measurements and ground magnetic observations. During the event, multiple BBFs are detected in the inner magnetosphere while the magnetic footprints of both magnetospheric and ionospheric satellites map to the same conjugate region surrounded by a group of magnetometer ground stations. It is suggested that the observed, localized substorm currents are caused by the observed magnetospheric BBFs, giving rise to intense geomagnetic perturbations. Our results provide direct evidence that the wide-range of intense dB/dt<strong> </strong>(and dH/dt) variations are associated with a large-scale, substorm current system, driven by multiple BBFs.</p>

APPROACHES AND EFFECTIVE METHODS OF INSTRUCTION IN THE FOREIGN LANGUAGE FOR SPECIAL PURPOSES

2021 ◽  
pp. 17-20
Author(s):  
O. Kuznetsova ◽  
V. Zlatnikov
Keyword(s):  
Foreign Language ◽  
English Language ◽  
Professional Communication ◽  
Foreign Languages ◽  
Present Stage ◽  
Professional Needs ◽  
Number Of Factors ◽  
Wide Range ◽  
Teaching Grammar ◽  
Practical Recommendations

At the present stage of expanding international contacts in various fields of activity for students it is becoming increasinglyimportant to expand their knowledge of languages outside of everyday foreign language (English). Learning foreign languages hasa number of benefits, including facilitating effective communication and building partnerships, business and military relationships with people from other countries/cultures. Since there are a number of factors that affect the effective acquisition of a foreign language in the context of bilin gualism, modern methods of teaching foreign languages have their own characteristics, considering the target areas and standards. There are many approaches to foreign language teaching developed at the end of the last centurythat have become widely used in teaching foreign languages for special purposes in higher education at the present stage of learning. The range of teaching methods varies depending on which aspects of language acquisition they emphasize – from teaching grammar to the lexicographic component of modern English-language culture of business and professional communication, which are seen as an element of communication skills of young military and civilian professionals [1]. As there is a wide range of different approaches and methods of teaching a foreign language for professional purposes used in lessons, the question will be whether there is evidence that some methods are more effective in acquiring and maintaining acquired skills. The article presents practical recommendations for motivating students to free oral/written communication in a foreign language, taking into account professional needs; the sequence of stages at which new programs for studying a foreign language of special purpose are logically executed, and also offers concerning a vocabulary is provided. The article evaluates and analyzes the latest trends in the methodology of teaching foreign languages, which provides a basis for effective study of a foreign language for professional purposes, taking into account the communicative orientation military, business and professional communication.

Enterprise Modeling for Business and IT Alignment

2014 ◽  
Vol 5 (2) ◽  
pp. 44-69 ◽  
Author(s):  
Julia Kaidalova ◽  
Ulf Siegerroth ◽  
Elżbieta Bukowska ◽  
Nikolay Shilov
Keyword(s):  
Enterprise Modeling ◽  
Collaborative Activity ◽  
It Alignment ◽  
Empirical Base ◽  
Wide Range ◽  
Enterprise Models ◽  
Business And It Alignment ◽  
Practical Recommendations

In order to achieve Business and IT Alignment (BITA) it is required to capture and analyze both business and IT dimensions of enterprises. In this regard Enterprise Modeling (EM) is acknowledged as one useful mean. One of the central roles during EM is EM practitioner who drives and coordinates the EM project. Conducting EM is a highly collaborative activity that requires considerable skills and experience since EM practitioner has to deal with various challenges throughout the project. Despite a quite wide range of research, EM challenges needs to be further investigated, in particular concerning practical recommendations related to creation and usage of enterprise models. This article presents a framework with challenges and recommendations for EM that is aimed on facilitating business and IT alignment. The empirical base for the study consists of interviews with EM practitioners that have significant experience in EM. In order to achieve Business and IT Alignment (BITA) it is required to capture and analyze both business and IT dimensions of enterprises. In this regard Enterprise Modeling (EM) is acknowledged as one useful mean. One of the central roles during EM is EM practitioner who drives and coordinates the EM project. Conducting EM is a highly collaborative activity that requires considerable skills and experience since EM practitioner has to deal with various challenges throughout the project. Despite a quite wide range of research, EM challenges needs to be further investigated, in particular concerning practical recommendations related to creation and usage of enterprise models. This article presents a framework with challenges and recommendations for EM that is aimed on facilitating business and IT alignment. The empirical base for the study consists of interviews with EM practitioners that have significant experience in EM.

scholarly journals Outcome of TMS-based motor mapping depends on TMS current direction

2018 ◽  
Author(s):  
Jord JT Vink ◽  
Petar I Petrov ◽  
Stefano Mandija ◽  
Rick M Dijkhuizen ◽  
Sebastiaan FW Neggers
Keyword(s):  
Primary Motor Cortex ◽  
Motor Evoked Potentials ◽  
Brain Regions ◽  
Motor Area ◽  
Current Direction ◽  
Induced Current ◽  
Motor Mapping ◽  
Neurosurgical Planning ◽  
Motor Maps ◽  
Induced Currents

ABSTRACTNavigated transcranial magnetic stimulation (TMS) in combination with electromyography (EMG) recordings can be used to map the brain regions in which TMS evokes motor-evoked potentials (MEPs) in certain muscles. Navigated TMS (nTMS) is used increasingly to identify the functional motor area of different muscles for clinical applications, including neurosurgical planning. However, the accuracy of TMS-based mapping of functional motor areas may depend on the TMS-induced current direction due to anisotropic cortical morphology, complicating association of the functional motor maps with neuroanatomical structures. Furthermore, it is not clear how well nTMS can distinguish nearby muscle representations on the cortical surface. We therefore investigated the functional motor maps obtained with posterior-to-anterior (PA) and lateral-to-medial (LM) TMS-induced currents within a spatially defined area by stimulating targets in a grid of locations over the left primary motor cortex in 8 healthy participants. Results were compared to functional MRI (fMRI) activation maps obtained using a voluntary opposing thumb movement task. We found that TMS applied with PA-induced currents identifies a motor area that is located significantly more anterior (8.7 – 10.4 mm depending on the muscle) with respect to an MEP motor area identified using LM-induced currents for the same muscle. Motor maps obtained with LM-induced currents show more overlap with the motor map identified using fMRI compared to PA-induced currents. In conclusion, the spatial representation of the MEP motor map identified by TMS is dependent on the direction of the induced current. These findings suggest that the application of nTMS using an LM-induced current direction corresponds best with the hand motor area as measured with fMRI.

scholarly journals Design and Development of Mirnov Coil Sensor for Eddy Currents Experiment on Toroidal Vessel

2019 ◽  
Vol 8 (11S) ◽  
pp. 793-797
Keyword(s):  
Eddy Currents ◽  
Magnetic Confinement ◽  
Calibration Method ◽  
Plasma Instabilities ◽  
Induced Current ◽  
Design And Development ◽  
Construction Technique ◽  
Hot Plasma ◽  
Induced Currents ◽  
Principle Objective

Tokamak is a magnetic confinement device that confines hot plasma in the shape of torus during the process of thermonuclear fusion power generation. In tokamak, eddy currents are produced due to change in plasma positions during plasma instabilities that induce electromagnetic forces on interaction with the induced currents. Mirnov coils are widely used in tokamaks to study plasma positions during plasma instabilities. Principle objective of this paper is the design and development of Mirnov coil sensor to find eddy currents on a toroidal vessel. This paper presents an elaborative and practical construction technique of a Mirnov coil. The calibration method of a Mirnov coil is also discussed. Mirnov coils as an eddy current diagnostics are tested and experiments to measure magnetic fields due to induced current on torroidal vessel are performed using the coils.

scholarly journals The deformation rate, atomic mobility and mechanical properties of metals

2021 ◽  
Vol 97 (1) ◽  
pp. 28-37
Author(s):  
D.S. Gertsriken ◽  
◽  
A.M. Husak ◽  
V.F. Mazanko ◽  
S. Ye. Bogdanov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Diffusion Coefficients ◽  
Mechanical Characteristics ◽  
Radioactive Isotopes ◽  
Diffusion Welding ◽  
Magnetic Pulse ◽  
Layer By Layer ◽  
Self Diffusion ◽  
Wide Range ◽  
The Difference

The dependences of diffusion coefficients in metals with different crystal lattice (b.c.c., f.c.c., h.c.p., b.c.t.), subjected to pulse effects by different types of processing in a wide range of strain rates (10-2 - 106 s-1) without heating and at T < 0,5 Tpl. studied by m ethods based on the use of radioactive indicators 55Fe, 95Nb, 60Co, 65Zn, 63Ni, 26Al, 44Ti (layer-by-layer radiometric analysis of residual integral activity, macro- and microautoradiography). Used such types of processing as ultrasonic shock treatment, diffusion welding, shock load, magnetic pulse processing, etc. On the same materials subjected to the same types of processing, mechanical characteristics (impact strength, microhardness, tensile strength, etc.) were determined. In addition, literature data related to the determination of some mechanical characteristics in the deformation of metals at different speeds were used. It turned out that with increasing the rate of plastic deformation there is not only an increase in the mobility of atoms, but also a decrease in differences in the values of the diffusion coefficients of intrinsic atoms and other diffusers in different metals. Despite the large difference in melting temperatures, in particular zinc and niobium, their self-diffusion coefficients in the migration of atoms without heating at a rate of 106 s-1 differ only 1.5 times, while at 1 s-1 the difference in the mobility of atoms is 4 orders of magnitude. It is shown that the velocity dependences of diffusion and mechanical characteristics can be rectilinear, have extremum or inflection, but they will be approximately the same for diffusion coefficients and parameters that characterize the mechanical properties of metals under impulse loads. Establishing the type of velocity dependences for diffusion and mechanical characteristics makes it possible to determine intermediate and extrapolated values for both characteristics, as well as on the schedule of one dependence to predict the shape of the other with a certain accuracy. Keywords: radioactive isotopes, self- and heterodiffusion, pulse loads, strain rate, mechanical characteristic.

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