Equivalence of the Riesz Method and theλ-Limiting Process for the Classical Electromagnetic Field of a Point Source

1947 ◽  
Vol 71 (11) ◽  
pp. 787-792 ◽  
Author(s):  
S. T. Ma
Keyword(s):  
Electromagnetic Field ◽  
Point Source ◽  
Riesz Method

scholarly journals Three-Dimensional Numerical Visualization And Simulation of Multiphysics in Point Source Dc Magnetometric Resistivity Method

2020 ◽  
Author(s):  
Wenlong Gao ◽  
Lei Zhou ◽  
Liangjun Yan
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Point Source ◽  
Three Dimensional ◽  
Theoretical Method ◽  
Potential Method ◽  
Resistivity Method ◽  
Physics Simulation ◽  
Visualization And Simulation ◽  
Numerical Calculation Method

Magnetometric Resistivity(MMR) Method, which can use the power supply method of the traditional apparent resistivity method to measure the magnetic field. At present, the application research abroad is relatively extensive, but the domestic(China) research on the application of the MMR method is very few, and it is not even well-known. This paper is based on the MMR theoretical method under the point source DC condition, combined with the abnormal potential method and the modified Biot-Savart law, and using the three-dimensional numerical calculation method of the finite difference method to calculate the abnormal potential field, electric field, and magnetic field on the matlab2018a platform. Calculate, realize the multi-physics simulation in the electromagnetic field through Matlab platform programming, and verify the correctness of the algorithm by the spherical anomaly model with an analytical solution. Through the visual simulation of the three-dimensional data volume of the multi-physics field in the electromagnetic field, we can better understand the response mechanism of the electromagnetic field under DC conditions and grasp their three-dimensional spatial distribution rules. It is hoped that the research in this article can help the research of MMR Personnel better use this method for exploration.

scholarly journals A note on the Riesz method and the method of residues

1949 ◽  
Vol 198 (1053) ◽  
pp. 170-173 ◽  
Keyword(s):  
Point Source ◽  
Analytic Continuation ◽  
Electromagnetic Theory ◽  
Riesz Method ◽  
Method Of Residues

It is shown that the Riesz method of analytic continuation and the method of residues give the same results in the classical electromagnetic theory of a point source.

Height and Angle Characteristics of Point Source Transmitting Power of Wireless Avionics Intra-Communication Systems Based on FDTD Analysis

2021 ◽  
Vol 35 (11) ◽  
pp. 1274-1275
Author(s):  
Shunichi Futatsumori ◽  
Kazuyuki Morioka ◽  
Takashi Hikage ◽  
Tetsuya Sekiguchi ◽  
Manabu Yamamoto ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Field Strength ◽  
Electric Field ◽  
Point Source ◽  
Communication Systems ◽  
Large Scale ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Radiated Power

The equivalent isotopically radiated power (EIRP) of a wireless avionics intra-communication (WAIC) system is limited to 6 dBm/MHz at the geometrical center of the aircraft, to avoid interference with aircraft radio altimeters, which are operated at the same frequency band between 4,200–4,400 MHz. In this paper, the height and angle characteristics of the point source EIRP of a WAIC system are analyzed based on the large scale FDTD analysis. Firstly, the strength of the electric field (E-field) around the three-dimensional model of Airbus A320-200 is analyzed. Then, the point source EIRP is calculated based on the analyzed E-field strength. Finally, the height and angle characteristics are analyzed to estimate the electromagnetic field characteristics of the aircraft.

XRMF applications of a monolithic, polycapillary, focusing x-ray optic

1996 ◽  
Vol 54 ◽  
pp. 240-241
Author(s):  
D. A. Carpenter ◽  
Ning Gao ◽  
G. J. Havrilla
Keyword(s):  
Trace Elements ◽  
Point Source ◽  
Focal Spot ◽  
Fluorescence Analysis ◽  
X Rays ◽  
Focal Distance ◽  
Spot Diameter ◽  
X Ray ◽  
Focal Spot Diameter

A monolithic, polycapillary, x-ray optic was adapted to a laboratory-based x-ray microprobe to evaluate the potential of the optic for x-ray micro fluorescence analysis. The polycapillary was capable of collecting x-rays over a 6 degree angle from a point source and focusing them to a spot approximately 40 µm diameter. The high intensities expected from this capillary should be useful for determining and mapping minor to trace elements in materials. Fig. 1 shows a sketch of the capillary with important dimensions.The microprobe had previously been used with straight and with tapered monocapillaries. Alignment of the monocapillaries with the focal spot was accomplished by electromagnetically scanning the focal spot over the beveled anode. With the polycapillary it was also necessary to manually adjust the distance between the focal spot and the polycapillary.The focal distance and focal spot diameter of the polycapillary were determined from a series of edge scans.

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