scholarly journals The electromagnetic field around a high voltage 400 KV electrical overhead lines and the influence on the biological systems

2005 ◽  
Vol 18 (1) ◽  
pp. 105-111 ◽  
Author(s):  
Adrian Marincu ◽  
Marian Greconici ◽  
Sorin Musuroi
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
High Voltage ◽  
Biological Systems ◽  
Electric Strength ◽  
Experimental Measurements ◽  
Human Beings ◽  
Overhead Lines ◽  
Electric And Magnetic Field

In this paper the analytical calculus and the experimental measurements of the electric and magnetic field around a high voltage 400KV electrical overhead lines has been analyzed. There have been analyzed the possible influences of the electromagnetic field on the health of the human beings. The calculus has been done using the Mat Lab medium, the experimental measurements of the electric strength have been done using a spherical dipole.

scholarly journals A Physically-Motivated Quantisation of the Electromagnetic Field on Curved Spacetimes

Entropy ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 844
Author(s):  
Ben Maybee ◽  
Daniel Hodgson ◽  
Almut Beige ◽  
Robert Purdy
Keyword(s):  
Magnetic Field ◽  
Field Theory ◽  
Quantum Field Theory ◽  
Electromagnetic Field ◽  
Minkowski Space ◽  
Unruh Effect ◽  
Quantum Field ◽  
Rindler Space ◽  
Electric And Magnetic Field ◽  
Curved Spacetimes

Recently, Bennett et al. (Eur. J. Phys. 37:014001, 2016) presented a physically-motivated and explicitly gauge-independent scheme for the quantisation of the electromagnetic field in flat Minkowski space. In this paper we generalise this field quantisation scheme to curved spacetimes. Working within the standard assumptions of quantum field theory and only postulating the physicality of the photon, we derive the Hamiltonian, H ^ , and the electric and magnetic field observables, E ^ and B ^ , respectively, without having to invoke a specific gauge. As an example, we quantise the electromagnetic field in the spacetime of an accelerated Minkowski observer, Rindler space, and demonstrate consistency with other field quantisation schemes by reproducing the Unruh effect.

Three-Dimensional Automatic Measurements System for RFID Magnetic Field

2011 ◽  
Vol 298 ◽  
pp. 278-281
Author(s):  
Wei Dong Hu ◽  
Pei Juan Wu
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Three Dimensional ◽  
Experimental Measurements ◽  
Rfid Technology

RFID has been applied extensively, but there is no an effective method to measure the electromagnetic distribution above the reader. In order to give the accurate value of the electromagnetic field, a three-dimensional automatic measurements system is designed. Both theoretic simulation and experimental measurements have shown that the system will play an important role in RFID technology.

scholarly journals Effect of A Superstrate on On-Head Matched Antennas for Biomedical Applications

Electronics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1099
Author(s):  
Md Rokunuzzaman Robel ◽  
Asif Ahmed ◽  
Akram Alomainy ◽  
Wayne S. T. Rowe
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Performance Improvement ◽  
Direct Contact ◽  
Biomedical Applications ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Conducting Layer ◽  
Electric And Magnetic Field ◽  
Biomedical Diagnosis

The effect of using a superstrate dielectric layer on an on-head matched antenna for biomedical diagnosis applications is investigated. Two on-head matched antennas are considered with different length meandered lines ensuring operation around 0.9 GHz frequency. The first antenna’s conductive radiating structure is in direct contact with the head phantom, whereas the second one utilises a 0.5 mm thick superstrate layer on top of the conducting layer as a buffer. The lateral dimensions of both antennas are held constant at 30 × 30 mm2. The electric and magnetic field distribution is analysed and the power penetration, 50 mm inside the head phantom, is derived from the electromagnetic field surrounding the antennas. Both homogeneous and inhomogeneous head phantoms are considered while evaluating the antennas in terms of their reflection coefficient, current distribution, electric field, magnetic field, specific absorption rate (SAR) and power penetration inside the head. The antennas are fabricated and measured utilizing an inhomogeneous phantom to validate the proposed performance improvement using a superstrate. It is shown that the superstrate antenna achieves a ~8 dB increase in power penetration inside the head phantom along with a 0.0731 W/kg decrease in SAR compared to the antenna without a superstrate.

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