Experimental Studies of Effectiveness of Active Screening of the Magnetic Field by Single Compensation Winding

2021 ◽  
Author(s):  
B. Kuznetsov ◽  
I. Bovdui ◽  
T. Nikitina ◽  
V. Kolomiets ◽  
B. Kobylianskyi
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Active Screening ◽  
The Magnetic Field

scholarly journals Reduction of magnetic field level in residential old buildings from overhead power lines by means of active screening

2021 ◽  
pp. 24-29
Author(s):  
B. I. Kuznetsov ◽  
T. B. Nikitina ◽  
I. V. Bovdui ◽  
V. V. Kolomiets ◽  
B. B. Kobylianskiy
Keyword(s):  
Magnetic Field ◽  
Residential Buildings ◽  
Experimental Studies ◽  
Spatial Arrangement ◽  
Power Lines ◽  
Active Screening ◽  
Overhead Power Lines ◽  
Active Shielding ◽  
The Magnetic Field ◽  
Storey Building

Aim. Reduction of the magnetic field induction to the level of modern sanitary standards by means of active screening in residential old buildings which are located near existing typical overhead power lines are considered. Active shielding of the magnetic field inside a single-storey and multi-storey building is considered. During the design the number, configurations, spatial arrangement of the shielding windings, as well as the currents in the shielding windings were determined. Methodology. The design problem for the system of active shielding reduced to solving the minimax vector optimization problem. The vector of objective function in this minimax problem is calculated based on Biot-Savart's law. The solution of this problem is based on multi-agent optimization algorithms. Results. The results of theoretical and experimental studies of the systems of active shielding of the magnetic field generated by various overhead power lines inside a single and multi-storey building are presented. Originality. The possibility of reducing the induction of the initial magnetic field inside the shielded space to the level of sanitary standards is shown. Practical value. From the point of view of the practical implementation for a reasonable choice of the number and spatial arrangement of shielding windings of systems for active shielding of the magnetic field generated by various overhead power lines inside residential buildings of different storey’s are given.

scholarly journals Chiral Magneto-Electrochemistry

2018 ◽  
Vol 4 (3) ◽  
pp. 36 ◽  
Author(s):  
Anup Kumar ◽  
Prakash Mondal ◽  
Claudio Fontanesi
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Spin Accumulation ◽  
Chiral Molecules ◽  
Electrochemical System ◽  
Ferromagnetic Electrodes ◽  
Spin Polarized ◽  
The Magnetic Field ◽  
Research Domain

Magneto-electrochemistry (MEC) is a unique paradigm in science, where electrochemical experiments are carried out as a function of an applied magnetic field, creating a new horizon of potential scientific interest and technological applications. Over time, detailed understanding of this research domain was developed to identify and rationalize the possible effects exerted by a magnetic field on the various microscopic processes occurring in an electrochemical system. Notably, until a few years ago, the role of spin was not taken into account in the field of magneto-electrochemistry. Remarkably, recent experimental studies reveal that electron transmission through chiral molecules is spin selective and this effect has been referred to as the chiral-induced spin selectivity (CISS) effect. Spin-dependent electrochemistry originates from the implementation of the CISS effect in electrochemistry, where the magnetic field is used to obtain spin-polarized currents (using ferromagnetic electrodes) or, conversely, a magnetic field is obtained as the result of spin accumulation.

Studies of Magnetically Active Silicone Elastomers on a Vibrostend

2021 ◽  
Vol 1037 ◽  
pp. 141-147
Author(s):  
Andrey Minaev ◽  
Juri Korovkin ◽  
Hammat Valiev ◽  
G.V. Stepanov ◽  
Dmitry Yu. Borin
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
Magnetic Field Effect ◽  
Magnetorheological Elastomer ◽  
Silicone Elastomers ◽  
Damping Coefficients ◽  
Deformation Properties ◽  
The Magnetic Field

Experimental studies magnetorheological elastomer specimens dynamic properties under the magnetic fields action on the vibrostend are carried out. Amplitude-frequency characteristics have been obtained. The magnetic field effect on the silicone magnetoreactive elastomers deformation properties and damping coefficients experimentally is established.

scholarly journals Generation of strong magnetic fields with a laser-driven coil

2018 ◽  
Vol 6 ◽  
Author(s):  
Zhe Zhang ◽  
Baojun Zhu ◽  
Yutong Li ◽  
Weiman Jiang ◽  
Dawei Yuan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Experimental Studies ◽  
Diagnostic Techniques ◽  
Magnetic Field Generation ◽  
Field Generation ◽  
Research Fields ◽  
Laser Facility ◽  
Spatio Temporal ◽  
The Magnetic Field

As a promising new way to generate a controllable strong magnetic field, laser-driven magnetic coils have attracted interest in many research fields. In 2013, a kilotesla level magnetic field was achieved at the Gekko XII laser facility with a capacitor–coil target. A similar approach has been adopted in a number of laboratories, with a variety of targets of different shapes. The peak strength of the magnetic field varies from a few tesla to kilotesla, with different spatio-temporal ranges. The differences are determined by the target geometry and the parameters of the incident laser. Here we present a review of the results of recent experimental studies of laser-driven magnetic field generation, as well as a discussion of the diagnostic techniques required for such rapidly changing magnetic fields. As an extension of the magnetic field generation, some applications are discussed.

Modeling of strain kinetics of damping viscoelastic magnetically controlled materials in creep mode

2019 ◽  
Vol 31 (2) ◽  
pp. 243-252
Author(s):  
Evguenia V Korobko ◽  
Mikalai A Zhurauski ◽  
Buhe Bateer ◽  
Zoya A Novikova ◽  
Vladimir A Kuzmin
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Magnetic Field Induction ◽  
The Other ◽  
Model Parameters ◽  
Field Induction ◽  
In Series ◽  
Maxwell Models ◽  
Kinetics Of ◽  
The Magnetic Field

The results of experimental studies of strain kinetics of composite magnetically controlled materials in the creep mode with preliminary exposure and without exposure are described by the Burgers model with two elastic and two viscous parameters, which is a combination of viscoelastic Kelvin–Voigt and Maxwell models connected in series. The dependence of the model parameters on the magnetic field induction is determined. The values of elastic and viscous parameters increase with increasing magnetic field induction in the range up to 500 mT by one or two orders of magnitude. It was determined that the value of the viscous Maxwell parameter does not change after preliminary exposure in the field. The values of the other two elastic and viscous Kelvin–Voigt parameters increase with exposure in a magnetic field.

Experimental research of viscoelastic properties and stress relaxation of magnetizable elastomers

2021 ◽  
Vol 57 (2) ◽  
pp. 161-170
Keyword(s):  
Magnetic Field ◽  
Stress Relaxation ◽  
Field Strength ◽  
Viscoelastic Properties ◽  
Uniform Magnetic Field ◽  
Experimental Studies ◽  
Theoretical Research ◽  
Shear Moduli ◽  
Viscosity Coefficients ◽  
The Magnetic Field

Torsional deformations of cylindrical bodies with magnetizable elastomers in a uniform magnetic field are considered. During theoretical research, different models of viscoelastic materials are used. Experimental studies of stress relaxation in a magnetic field are carried out, and the models that consider stress relaxation are used to describe the experiment. Dependences of the shear moduli and viscosity coefficients of magnetizable elastomers on the magnetic field strength are found experimentally. Tables 1, Figs 10, Refs 9.

Experimental studies in magneto-fluid dynamics: flow over a sphere with a cylindrical afterbody

1969 ◽  
Vol 35 (2) ◽  
pp. 411-416 ◽  
Author(s):  
T. Maxworthy
Keyword(s):  
Magnetic Field ◽  
Fluid Dynamic ◽  
Experimental Studies ◽  
Dynamic Flow ◽  
Composite Body ◽  
Pressure Drag ◽  
Pressure Distributions ◽  
Pressure Profiles ◽  
Measured Pressure ◽  
The Magnetic Field

The measured pressure distributions over the front hemisphere of a hemispherecylinder combination placed in an aligned fields magneto-fluid dynamic flow are presented. Integration of the pressure profiles show that the form or pressure drag of the composite body first increases as the magnetic field strength increases, at a fixed flow velocity, but then decreases as the magnetic field becomes still stronger.

Theoretical analysis and experimental studies on torque friction in magnetic fluid seals

2019 ◽  
Vol 234 (2) ◽  
pp. 274-281
Author(s):  
Marcin Szczęch
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Direct Contact ◽  
Experimental Studies ◽  
Special Test ◽  
Laboratory Results ◽  
Additional Correction ◽  
Different Temperatures ◽  
Low Volume ◽  
The Magnetic Field

Magnetic fluid seals are among the most common applications of ferrofluids. In such seals, the torque friction results only from the internal friction in the fluid and there is no direct contact between seal elements. Despite this, the heat generated during operation can be significant due to the low volume of the ferrofluid in the seal and high rotational speeds. The difficulty in calculating the torque friction is because the ferrofluid is a non-Newtonian fluid and changes its viscosity under the influence of a magnetic field. In order to measure torque friction in magnetic fluid seals, a special test stand was built. Tests were performed at different rotation speeds, different temperatures, and two seal stage geometries (rectangle and trapezoid). Numerical simulations were performed to determine the magnetic field distribution in the seal. Dynamic viscosity under the influence of the magnetic field was measured on a rotary rheometer. Mathematical models were compared with laboratory results. The results obtained from the calculations in some cases gave overstated values almost twice in value. An additional correction in the case of ferrofluid viscosity is proposed.

EXPERIMENTAL STUDIES ON MAGNETORHEOLOGICAL MODEL SUSPENSIONS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4967-4973 ◽  
Author(s):  
ALEXANDRA-MARIA TRENDLER ◽  
HOLGER BÖSE
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Experimental Studies ◽  
Iron Particle ◽  
Solid Content ◽  
Oil Viscosity ◽  
Base Oil ◽  
Sedimentation Behavior ◽  
Mr Fluids ◽  
The Magnetic Field

Magnetorheological model suspensions with different contents of iron particles have been investigated. The results show an increase of the shear stress by increasing the magnetic field and the solid content, which was mathematically modelled. The influence of the solid content is approximately exponential without magnetic field and linear in strong magnetic fields. The effect of the temperature and of the base oil viscosity on the shear stress is negligible in the field but decisive without field. The sedimentation behavior also strongly depends on the iron particle content, where MR fluids with a higher concentration settle with a lower intensity due to the higher sediment height. The response time of the magnetorheological model suspensions could not be clearly determined, but it is less than 10 milliseconds.

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