Correction to paper by David B. Large and James R. Wait, ‘Theory of electromagnetic coupling phenomena in the Earth-ionosphere cavity’

1969 ◽  
Vol 74 (3) ◽  
pp. 927-927
Author(s):  
David B. Large ◽  
James R. Wait
Keyword(s):  
Electromagnetic Coupling ◽  
The Earth ◽  
Coupling Phenomena

scholarly journals Dangerous Voltages due to Direct Lightning Strike into the Communication Tower

2007 ◽  
Vol 3 (1) ◽  
pp. 44
Author(s):  
Slavko Vujević ◽  
Petar Sarajčev
Keyword(s):  
Software Package ◽  
Electromagnetic Coupling ◽  
Circular Cross Section ◽  
Potential Method ◽  
Lightning Strike ◽  
The Earth ◽  
Lumped Parameter ◽  
Leakage Resistance ◽  
Tower Structure ◽  
Analytical Expressions

This paper presents a novel technique for computing dangerous voltages due to direct lightning strike into the communication tower and associated earthing system, which is based on the use of the well-known ATP-EMTP software package. The earthing grid and the communication tower structure are approximated by the circular cross section conductors. In numerical model, conductors are subdivided into segments (1D finite elements) and Clark's model with distributed constant parameters is then applied. Because of the limitations of ATP-EMTP software package, the leakage resistance of buried segments is modelled as additional lumped parameter. Analytical expressions for distributed and lumped segment parameters are derived using the average potential method. Mutual electromagnetic coupling between segments is neglected due to the limitations imposed by the ATP-EMTP software package, which is based on transmission line approach. Separate computer program is developed for obtaining the earth surface transient potential distribution, from which step and touch voltages are then computed.

scholarly journals New Determination of the “Decade” Fluctuations in the Rotation of the Earth 1860–1978

1979 ◽  
Vol 82 ◽  
pp. 55-57
Author(s):  
L. V. Morrison
Keyword(s):  
Angular Momentum ◽  
Electromagnetic Coupling ◽  
Viscous Stress ◽  
Mantle Boundary ◽  
Core Mantle Boundary ◽  
Topographic Features ◽  
The Core ◽  
The Earth ◽  
Rotation Of The Earth

Observations of the Earth's rotation have shown irregular variations of rate which have characteristic times of decades. These have been attributed to transfer of angular momentum between core and mantle by some mechanism such as inertial coupling, viscous stress, electromagnetic coupling or stresses produced by topographic features on the core mantle boundary.

Electromagnetic coupling phenomena in co-axial rectangular channels

2020 ◽  
Vol 160 ◽  
pp. 111854 ◽  
Author(s):  
Simone Siriano ◽  
Alessandro Tassone ◽  
Gianfranco Caruso ◽  
Alessandro Del Nevo
Keyword(s):  
Electromagnetic Coupling ◽  
Rectangular Channels ◽  
Coupling Phenomena

HIGH‐FREQUENCY ELECTROMAGNETIC COUPLING BETWEEN SMALL COPLANAR LOOPS OVER AN INHOMOGENEOUS GROUND

Geophysics ◽  
1972 ◽  
Vol 37 (6) ◽  
pp. 997-1004 ◽  
Author(s):  
James A. Fuller ◽  
James R. Wait
Keyword(s):  
Half Space ◽  
High Frequency ◽  
Electromagnetic Coupling ◽  
Current Source ◽  
Vertical Axis ◽  
Loop Current ◽  
Mutual Impedance ◽  
Multiplicative Factor ◽  
The Earth ◽  
Horizontal Electric Dipole

An integral formulation is given for the fields of a loop current source which is located over a horizontally stratified half‐space and has a vertical axis. The electrical properties of the half‐space vary exponentially with the depth into the earth. An asymptotic solution is developed for the case of source and observer on the interface but separated by a large numerical distance. The approximate solution is then used to determine the mutual impedance between two small loops and between the loop and a horizontal electric dipole, when the antennas are on the interface. It is found that the effect of stratification on the mutual impedance is represented approximately by a single multiplicative factor.

ELECTROMAGNETIC COUPLING BETWEEN GROUNDED WIRES AT THE SURFACE OF A TWO‐LAYER EARTH

Geophysics ◽  
1973 ◽  
Vol 38 (5) ◽  
pp. 854-863 ◽  
Author(s):  
Gerald W. Hohmann
Keyword(s):  
Numerical Solution ◽  
Lower Layer ◽  
Electromagnetic Coupling ◽  
Induced Polarization ◽  
Electrode Configuration ◽  
Smooth Transition ◽  
Layer Model ◽  
The Earth ◽  
Two Layer Model

A technique has been developed for computing the effects of electromagnetic coupling in induced polarization surveys, when the earth can be approximated by a two‐layer model. Results are given for the dipole‐dipole array, but the numerical solution described can be applied to any electrode configuration. No unusual effects were observed for the models computed. As the thickness of the upper layer is increased, there is a smooth transition between the coupling response of a homogeneous earth having the resistivity of the upper layer and that of a homogeneous earth having a resistivity equal to that of the lower layer.

scholarly journals Electromagnetic interference in a multiconductor transmission system – MTL

2019 ◽  
Vol XXII (2) ◽  
pp. 343-351
Author(s):  
Ciocioi I.
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Printed Circuit Boards ◽  
Electronic Circuit ◽  
Electromagnetic Coupling ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Different Types ◽  
Correct Function ◽  
Coupling Phenomena

In electrical and electronic practice, many connection and transmission elements (cables) are used as a multi-conductor transmission lines (MTL). The electromagnetic fields existing in the environment of these multiconductor transmission lines and can generate different types of coupling phenomena, causing EMC problems by the appearance of the unwanted EMI, disturbing the correct function and altering the information. Electromagnetic coupling between the circuits/cables of a circuit (also known as crosstalk) can also occur between the signal and power paths of an assembly made on printed circuit boards, PCB (printed board circuit), so it is important that when designing such an electrical / electronic circuit, these aspects should be taken into account.

Stress analysis of a functionally graded magneto-electro-elastic strip with multiple moving cracks

2016 ◽  
Vol 22 (3) ◽  
pp. 304-323 ◽  
Author(s):  
R Bagheri ◽  
M Ayatollahi ◽  
SM Mousavi
Keyword(s):  
Integral Transform ◽  
Electromagnetic Coupling ◽  
Functionally Graded ◽  
Elastic Strip ◽  
Crack Interactions ◽  
Magnetic Loading ◽  
Field Intensity Factors ◽  
Functionally Graded Piezoelectric ◽  
Steady State Problem ◽  
Coupling Phenomena

This paper investigates the linear steady state problem of several moving cracks in a functionally graded magneto-electro-elastic strip subjected to anti-plane mechanical and in-plane electric and magnetic loading. For simplicity, it is assumed that the properties of the strip vary continuously according to exponential functions along the thickness of the functionally graded piezoelectric piezomagnetic (FGPP) layer. By combining the dislocation method and integral transform technique, an exact solution in closed form to this problem is obtained. Electro-magneto-mechanical loads are applied on the crack surfaces, which are assumed to be magneto-electrically impermeable. Numerical examples are presented to show the interesting mechanical and electromagnetic coupling phenomena induced by multi-crack interactions. Finally, the effects of crack velocity, material constants, and geometric parameters upon the field intensity factors are studied. The results are useful for the design of the magneto-electro-elastic structures.

Sign in / Sign up

Export Citation Format

Share Document