Concentrating, diverging, shifting, and splitting electromagnetic beams using a single conical structure

2020 ◽  
Vol 128 (9) ◽  
pp. 093105
Author(s):  
Wallysson Barros ◽  
Antônio de Pádua Santos ◽  
Erms Pereira
Keyword(s):  
Conical Structure ◽  
Electromagnetic Beams

scholarly journals Analytical Modeling and Design of Novel Conical Halbach Permanent Magnet Couplings for Underwater Propulsion

2021 ◽  
Vol 9 (3) ◽  
pp. 290
Author(s):  
Yukai Li ◽  
Yuli Hu ◽  
Youguang Guo ◽  
Baowei Song ◽  
Zhaoyong Mao
Keyword(s):  
Permanent Magnet ◽  
Analytical Calculation ◽  
Underwater Propulsion ◽  
Conical Structure ◽  
Torque Analysis ◽  
Dynamic Seal ◽  
And Performance ◽  
The Stability ◽  
Propulsion Unit ◽  
Force Calculation

Permanent magnet couplings can convert a dynamic seal into a static seal, thereby greatly improving the stability of the underwater propulsion unit. In order to make full use of the tail space and improve the transmitted torque capability, a conical Halbach permanent magnet coupling (C-HPMC) is proposed in this paper. The C-HPMC combines multiple cylindrical HPMCs with different sizes into an approximately conical structure. Compared with the conical permanent magnet couplings in our previous work, the novel C-HPMC has better torque performance and is easy to process. The analytical calculation method of transmitted torque of C-HPMC is proposed on the basis of torque calculation of the three common types of HPMCs. The accuracy of the torque calculation of the three HPMCs is verified, and the torque performance of the three HPMCSs of different sizes is compared and discussed. The “optimal type selection” method is proposed and applied in the design of C-HPMC. Finally, on the basis of torque analysis calculation and axial force calculation, a complete flowchart of the design and performance analysis of C-HPMC is described.

Self−focusing of electromagnetic beams in bismuth

1975 ◽  
Vol 46 (1) ◽  
pp. 369-372 ◽  
Author(s):  
D. P. Tewari ◽  
Awdhesh Kumar
Keyword(s):  
Self Focusing ◽  
Electromagnetic Beams

Propagation of astigmatic stochastic electromagnetic beams in oceanic turbulence

2013 ◽  
Vol 114 (4) ◽  
pp. 475-482 ◽  
Author(s):  
Ying Zhou ◽  
Qi Chen ◽  
Daomu Zhao
Keyword(s):  
Oceanic Turbulence ◽  
Electromagnetic Beams

Anomalous absorption of the circularly polarized electromagnetic beams near the plasma frequency in a magnetized electron plasma

2007 ◽  
Vol 73 (3) ◽  
pp. 315-330 ◽  
Author(s):  
S. R. SESHADRI
Keyword(s):  
Resonant Frequency ◽  
Plasma Frequency ◽  
Unit Length ◽  
Plane Waves ◽  
Electron Plasma ◽  
Magnetostatic Field ◽  
Power Absorption ◽  
Circularly Polarized ◽  
Focused Beams ◽  
Electromagnetic Beams

AbstractThe propagation of circularly polarized electromagnetic beams along the magnetostatic field in an electron plasma is investigated. As a consequence of a strong interaction with the medium, the beam spreads rapidly on propagation near the cutoff frequencies and the cyclotron resonant frequency of the corresponding plane waves, as well as near the plasma frequency. The power absorption for unit length near the cyclotron frequency and the plasma frequency are determined. For tightly focused beams, there is significant power absorption near the plasma frequency as compared with that at the cyclotron resonant frequency.

scholarly journals Determinantal variety and normal embedding

2017 ◽  
Vol 10 (01) ◽  
pp. 27-34 ◽  
Author(s):  
K. Katz ◽  
M. Katz ◽  
D. Kerner ◽  
Y. Liokumovich
Keyword(s):  
Metric Space ◽  
Space Structure ◽  
The Other ◽  
Intrinsic Metric ◽  
Lipschitz Equivalence ◽  
Other Hand ◽  
Determinantal Variety ◽  
Conical Structure ◽  
Positive Determinant

The space [Formula: see text] of matrices of positive determinant inherits an extrinsic metric space structure from [Formula: see text]. On the other hand, taking the infimum of the lengths of all paths connecting a pair of points in [Formula: see text] gives an intrinsic metric. We prove bi-Lipschitz equivalence between intrinsic and extrinsic metrics on [Formula: see text], exploiting the conical structure of the stratification of the space of [Formula: see text] matrices by rank.

Polarization properties of stochastic electromagnetic beams

2008 ◽  
Vol 281 (4) ◽  
pp. 515-520 ◽  
Author(s):  
O. Korotkova ◽  
T.D. Visser ◽  
E. Wolf
Keyword(s):  
Electromagnetic Beams

Representation of vector electromagnetic beams

1980 ◽  
Vol 22 (3) ◽  
pp. 1159-1164 ◽  
Author(s):  
D. N. Pattanayak ◽  
G. P. Agrawal
Keyword(s):  
Electromagnetic Beams
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