scholarly journals Artificial and natural electromagnetic structures with strongly inductive surface impedance

2021 ◽  
Vol 1198 (1) ◽  
pp. 012002
Author(s):  
Yu B Bashkuev ◽  
M G Dembelov ◽  
D G Buyanova ◽  
L Kh Angarkhaeva ◽  
I B Naguslaeva
Keyword(s):  
Numerical Modelling ◽  
Surface Impedance ◽  
Electromagnetic Waves ◽  
Layered Structures ◽  
Numerical Results ◽  
Radio Waves ◽  
Attenuation Function ◽  
Field Level

Abstract Artificial and natural electromagnetic structures with strongly inductive surface impedance are considered. The object of the research is layered structures of the “dielectric-conductor” type. The existence of impedance media with the maximum possible phase of a strongly inductive impedance in the range from a few hertz to tens of gigahertz has been established. The results of numerical modelling of the propagation of decimeter radio waves over a plane strongly inductive surface are presented, these numerical results are necessary for calculating the attenuation function W and the field level E of microwave electromagnetic waves.

scholarly journals Integral equation method for the attenuation factor calculation with consideration of the earth's surface impedance.

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
V.V. Akhiyarov ◽  
◽  
Keyword(s):  
Integral Equation ◽  
Surface Impedance ◽  
Spherical Surface ◽  
Attenuation Factor ◽  
Integral Equation Method ◽  
Numerical Results ◽  
Equation Method ◽  
Attenuation Function ◽  
The Real ◽  
Function Computation

This paper presents a new integral equation to calculate the attenuation factor near the Earth's surface. An expression for the attenuation function computation at arbitrary heights is derived and the distance dependences of the attenuation factor are presented. The correspondence of the numerical results with analytical calculations for the planar and spherical surface is shown. The results for the real terrain profile are given.

PONDEROMOTIVE EFFECT OF ELECTROMAGNETIC WAVES ON THIN VIBRATORS WITH WEAKLY PERTURBED SURFACE IMPEDANCE

2020 ◽  
Vol 79 (14) ◽  
pp. 1205-1215
Author(s):  
Yu. M. Penkin ◽  
V. A. Katrich ◽  
M. V. Nesterenko ◽  
S. L. Berdnik
Keyword(s):  
Surface Impedance ◽  
Electromagnetic Waves

Minimizing the reflection of electromagnetic waves by surface impedance

Wave Motion ◽  
1987 ◽  
Vol 9 (1) ◽  
pp. 19-36 ◽  
Author(s):  
T.J. Bridges ◽  
G. Chen ◽  
G. Crosta
Keyword(s):  
Surface Impedance ◽  
Electromagnetic Waves

Electromagnetic field generated by an off‐axis source in a cylindrically layered medium with an arbitrary number of horizontal discontinuities

Geophysics ◽  
1993 ◽  
Vol 58 (5) ◽  
pp. 616-625 ◽  
Author(s):  
Qing‐Huo Liu
Keyword(s):  
Arbitrary Number ◽  
Electromagnetic Waves ◽  
Layered Medium ◽  
Azimuthal Angle ◽  
Well Logging ◽  
Transverse Magnetic ◽  
Numerical Results ◽  
Optical Fiber Communications ◽  
Eccentricity Effect ◽  
Large Eccentricity

We investigate the propagation of electromagnetic waves in a cylindrically layered medium with an arbitrary number of horizontal discontinuities. The dielectric constant, conductivity, and magnetic permeability of the medium are functions of ρ and z only (i.e., independent of the azimuthal angle ϕ), but the field generated by an off‐axis source in this medium is in general a function of ρ, ϕ, and z. This two and a half‐dimensional (2.5-D) problem is often encountered in electromagnetic well logging, as well as in other areas such as optical fiber communications and integrated optics. We show that a coupling exists between the transverse electric (TE) and transverse magnetic (TM) components of the field even in the absence of the horizontal discontinuities, which makes it difficult to solve for the field. We apply an efficient numerical mode‐matching (NMM) algorithm to tackle this 2.5-D problem. This algorithm uses the local reflection and transmission operators developed in the recent work on the diffraction of nonaxisymmetric waves in a cylindrically layered medium with a single horizontal discontinuity. For several special geometries, we compare the numerical results from this NMM algorithm with analytical solutions as well as the earlier numerical results for axisymmetric cases, and found excellent agreement between them. As an application to the geophysical subsurface sensing, we solve several practical problems, and find that a large eccentricity effect can occur in realistic electromagnetic well logging. Moreover, this large eccentricity effect is strongly coupled with thin‐bed effect. Conventional log interpretation methods cannot adequately account for these effects. With the NMM algorithm developed here, all these different effects can be accounted for simultaneously and accurately.

scholarly journals ELECTROMAGNETIC WAVES RADIATION BY A VIBRATORS SYSTEM WITH VARIABLE SURFACE IMPEDANCE

2016 ◽  
Vol 51 ◽  
pp. 157-163 ◽  
Author(s):  
Sergey L. Berdnik ◽  
Viktor Katrich ◽  
Mikhail V. Nesterenko ◽  
Yuriy M. Penkin
Keyword(s):  
Surface Impedance ◽  
Electromagnetic Waves ◽  
Variable Surface

scholarly journals Radio Emission Model of a 'Typical' Pulsar

1987 ◽  
Vol 40 (6) ◽  
pp. 755 ◽  
Author(s):  
AZ Kazbegi ◽  
GZ Machabeli ◽  
G Melikidze
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Emission Model ◽  
Radio Waves ◽  
Resonance Case ◽  
Pulsar Magnetosphere ◽  
Pulsar Emission ◽  
Dipole Magnetic Field ◽  
New Type ◽  
The Magnetic Field

The generation of radio waves in the plasma of the pulsar magnetosphere is considered taking into account the inhomogeneity of the dipole magnetic field. It is shown that the growth rate of the instability of the electromagnetic waves calculated in the non-resonance case turns out to be of the order of 1/ TO (where TO is the time of plasma escape from the light cylinder). However, the generation of electromagnetic waves from a new type Cherenkov resonance is possible, occurring when the particles have transverse velocities caused by the drift due to the inhomogeneity of the magnetic field. Estimates show that the development of this type of instability is possible only for pulsars with ages which exceed 104 yr. We make an attempt to explain some peculiarities of 'typical' pulsar emission on the basis of the model developed.

scholarly journals Analysis of Effects of Domestic Wireless Equipments on Living Beings

2020 ◽  
Vol 8 (4S) ◽  
pp. 91-95
Keyword(s):  
Adverse Effects ◽  
Mobile Phone ◽  
Communication System ◽  
Electromagnetic Waves ◽  
Radio Waves ◽  
Character Disorder ◽  
The World ◽  
Neuron Damage ◽  
Radioactive Radiation ◽  
System Today

The electromagnetic waves have developed the communication system today. They are around the world completely and our environment remains under the influence of radio waves radiating from mobile phone towers and cellphones. The adverse effects of e-pollution are not subject to some form of surroundings. Radioactive radiation directly affects biomolecules such as DNA and produces genetic toxicity. In addition to neuron damage, character disorder has seen in flying birds and mammals. The radiation can have an impact on the reproduction of animals and mammals and is therefore a major cause of concern in the present.

4. Windows in the sky

2016 ◽  
pp. 39-46
Author(s):  
Geoff Cottrell
Keyword(s):  
Solar Radiation ◽  
Electromagnetic Radiation ◽  
Electromagnetic Waves ◽  
Outer Space ◽  
Cosmic Ray ◽  
High Energy ◽  
Electromagnetic Spectrum ◽  
Radio Waves ◽  
Transverse Waves ◽  
The Universe

The atmosphere influences much of what can be seen through a telescope. Most of the atmosphere lies within 16 km from the Earth’s surface. Further out, the air becomes thinner until it merges with outer space. In the ionosphere—a layer 75–1000 km high—neutral atoms are ionized by solar radiation and high-energy cosmic ray particles arriving from distant parts of the Universe. ‘Windows in the sky’ explains electromagnetic radiation and the electromagnetic spectrum from gamma rays through to visible light and radio waves. Electromagnetic waves are transverse waves that can be polarized. The atmosphere acts as a filter and blocks cosmic electromagnetic radiation. Atmospheric turbulence distorts starlight resulting in ‘twinkling’ stars.

scholarly journals Radiation in the Optical and UHF Range Emitted by Partial Discharges

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4334 ◽  
Author(s):  
Michał Kozioł ◽  
Łukasz Nagi ◽  
Michał Kunicki ◽  
Ireneusz Urbaniec
Keyword(s):  
Electromagnetic Waves ◽  
Electrical Power ◽  
Partial Discharges ◽  
Radio Waves ◽  
Insulation Systems ◽  
Surface Discharges ◽  
High Voltage Insulation ◽  
Solid Dielectrics ◽  
Electrode Systems ◽  
Optical Spectrophotometry

This paper presents the results of analysis of a solid dielectric’s influence on the phenomena associated with the signals emitted by surface partial discharges. Three types of electrode systems were tested, in which solid dielectrics made of pressboard, Teflon, and glass were used. The emission of such signals as radio waves in the Ultra high frequency (UHF) range and optical radiation was analyzed. The measurements were carried out in the insulation systems most commonly used in electrical power equipment, i.e., mineral oil and air. UHF and optical spectrophotometry methods were used to register the emitted signals. The obtained results indicate that the type of material from which the dielectric solid is made may have a potential impact on some ranges of emitted electromagnetic waves during the surface electrical discharges. The research topic undertaken is important in issues associated with high-voltage insulation systems and in particular with surface discharges, which are often the cause of their damage.

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