Models of surface impedance of the LW-MW of the marine radio path with the change in ice thickness on basis of spatial Fourier series

2021 ◽  
Author(s):  
Yuri B. Bashkuev ◽  
Ludmila K. Angarkhaeva ◽  
Darima G. Buyanova
Keyword(s):  
Fourier Series ◽  
Surface Impedance ◽  
Ice Thickness ◽  
Radio Path

THE SURFACE IMPEDANCE OF THE "THIN ICE - SEA" AND "THICK ICE - SEA" STRUCTURES IN VLF-VHF RADIO WAVE BANDS

2021 ◽  
pp. 24-33
Author(s):  
Yu. B. Bashkuev ◽  
L. Kh. Angarkhaeva ◽  
D. G. Buyanova
Keyword(s):  
Electromagnetic Field ◽  
Radio Wave ◽  
Surface Impedance ◽  
Ice Thickness ◽  
Angle Of Incidence ◽  
Boundary Condi Tions ◽  
Impedance Boundary ◽  
Radar Systems ◽  
Condi Tions ◽  
Wave Range

To calculate the propagation of the electromagnetic field over the two-layer struc-ture "ice - sea", the areas of applicability of the impedance boundary conditions are determined depending on the thickness of the ice and the angle of incidence of the vertically polarized wave in the range of 0.01-420 MHz. The article examines the structures "thin ice - sea" and "thick ice - sea" (six models of ice cover). The ice thickness varied from 0.03 to 9 m. The results are needed to calculate the atten-uation function and the field level in the VLF, LF, MF, HF, VHF radio wave bands. It is shown that for the structure “ice - sea” it is important to take into account the dependence of the surface impedance on the angle of incidence for over-the-horizon radar systems in the HF radio wave range. In the VHF range the frequency bands are determined for ice 80 cm thick, in which the impedance boundary condi-tions are applicable.

Topology Optimization of IPM Motors using Fourier Series

2017 ◽  
Vol 137 (3) ◽  
pp. 245-253
Author(s):  
Hidenori Sasaki ◽  
Hajime Igarashi
Keyword(s):  
Fourier Series ◽  
Topology Optimization

The maximal operator of the Marcinkiewicz-Fejér means of the 2-dimensional Vilenkin-Fourier series

2008 ◽  
Vol 45 (3) ◽  
pp. 321-331
Author(s):  
István Blahota ◽  
Ushangi Goginava
Keyword(s):  
Fourier Series ◽  
Hardy Space ◽  
Maximal Operator ◽  
Fejér Means

In this paper we prove that the maximal operator of the Marcinkiewicz-Fejér means of the 2-dimensional Vilenkin-Fourier series is not bounded from the Hardy space H2/3 ( G2 ) to the space L2/3 ( G2 ).

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
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