On the Recording of the Scattering Fields of Antennas in Their Near Zone

2022 ◽  
Author(s):  
Yu. I. Belov ◽  
E. L. Varentsov ◽  
I. A. Illarionov
Keyword(s):  
Near Zone

Mathematical Simulation of the Bearing Process in the Near Zone of a Complex Extended Object

2004 ◽  
Vol 61 (2) ◽  
pp. 141-149
Author(s):  
N. V. Barkhudaryan ◽  
S. E. Vazhinsky ◽  
V. A. Vasilets ◽  
A. Z. Sazonov ◽  
O. I. Sukharevsky
Keyword(s):  
Mathematical Simulation ◽  
Extended Object ◽  
Near Zone

On applying the perturbation theory for the evaluation of near zone scattering properties of a perturbed PEMC cylinder

Optik ◽  
2021 ◽  
pp. 166844
Author(s):  
Fahad Masood ◽  
Muhammad Arshad Fiaz ◽  
Muhammad Aqueel Ashraf
Keyword(s):  
Perturbation Theory ◽  
Near Zone

Content and distribution of239,240Pu in the topsoil and plants of the near zone of the leningrad atomic electric power station

Atomic Energy ◽  
1993 ◽  
Vol 74 (6) ◽  
pp. 478-481 ◽  
Author(s):  
T. A. Goryachenkova ◽  
F. I. Pavlotskaya ◽  
I. E. Kazinskaya ◽  
K. V. Barsukova ◽  
V. V. Emel'yanov ◽  
...  
Keyword(s):  
Electric Power ◽  
Electric Power Station ◽  
Power Station ◽  
Near Zone ◽  
Atomic Electric Power Station

Проблемы локации источников акустической эмиссии

2021 ◽  
pp. 35-44
Author(s):  
Ю.Г. Матвиенко ◽  
И.Е. Васильев ◽  
Д.В. Чернов ◽  
В.И. Иванов ◽  
С.В. Елизаров
Keyword(s):  
Acoustic Emission ◽  
High Frequency ◽  
Tensile Tests ◽  
Threshold Method ◽  
Near Zone ◽  
Speed Dependence ◽  
Partial Energy ◽  
Base Size ◽  
Frequency Components ◽  
Amplitude Level

The accuracy of the location of acoustic emission (AE) sources in the concentrator zones (central holes 5 mm in diameter) located at a distance of 40 mm from the receiving transducers during tensile tests of steel, aluminum alloy and composite flat specimens with dimensions of 550x50x4 mm was evaluated. Calculated speed dependence of propagation of pulses on the level of their amplitude and the partial energy of the high-frequency components of the spectrum is studied. With the threshold method of signal registration, the error in the location of AE event sources arising in the near zone of the receiving transducers at a distance 𝛥L<0.1 m can significantly exceed 10% relative to the base size (B) of the location area, when B<0.5 m. Moreover, with a decrease in the distance 𝛥L<0.05 m, the level of possible error will increase, reaching 20-30% relative to the basic size of the antenna array, when recording pulses with an amplitude level um<60 dB and a fraction of the energy of high-frequency spectrum components not exceeding 10%.

scholarly journals The investigation of the features optical vortices focusing by ring gratings with the variable height using high-performance computer systems

2021 ◽  
Vol 2086 (1) ◽  
pp. 012166
Author(s):  
D A Savelyev
Keyword(s):  
High Performance ◽  
Focal Spot ◽  
Fdtd Method ◽  
Spot Size ◽  
Laser Beams ◽  
Optical Vortices ◽  
Focal Spot Size ◽  
Near Zone ◽  
High Performance Computer ◽  
Difference Time

Abstract The diffraction of vortex laser beams with circular polarization by ring gratings with the variable height was investigated in this paper. Modelling of near zone diffraction is numerically investigated by the finite difference time domain (FDTD) method. The changes in the length size of the light needle and focal spot size are shown depending on the type of the ring grating.

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