scholarly journals On the Apparent Non-Uniqueness of the Electromagnetic Field Components of Return Strokes Revisited

Atmosphere ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1319
Author(s):  
Vernon Cooray ◽  
Gerald Cooray ◽  
Marcos Rubinstein ◽  
Farhad Rachidi
Keyword(s):  
Electromagnetic Field ◽  
Electric Field ◽  
Electromagnetic Fields ◽  
Research Work ◽  
Current Source ◽  
Total Field ◽  
Single Field ◽  
A Current ◽  
Total Electric Field

Recent research work shows that there are four procedures that can be used to calculate the electromagnetic fields from a current source. These different procedures, even though producing the same total field, give rise to field components that differ from one procedure to another. This has led to the understanding that the various field terms that constitute the total field cannot be uniquely determined. In this paper, it is shown that all four field expressions can be reduced to a single field expression, and the various field terms arising from acceleration, uniformly moving, and stationary charges can be uniquely determined. The differences in the field terms arising from different techniques are caused by the different ways of summing up the contribution to the total electric field coming from the accelerating, moving, and stationary charges.

MONITORING SYSTEM TO ENSURE THE ELECTROMAGNETIC SAFETY OF HOUSEHOLD OBJECTS

2020 ◽  
Author(s):  
Е.В. ТИТОВ
Keyword(s):  
Electromagnetic Field ◽  
Field Strength ◽  
Electric Field ◽  
Electromagnetic Radiation ◽  
Electromagnetic Fields ◽  
Personal Computer ◽  
Experimental Studies ◽  
Electromagnetic Environment ◽  
Stay Time ◽  
Computer Monitors

Предложен метод формирования картин опасности электромагнитных излучений в ограниченном пространстве с источниками электромагнитных полей по критерию допустимого времени пребывания людей. Представлены результаты экспериментальных исследований опасности электромагнитного поля от мониторов персональных компьютеров, оптических манипуляторов типа «мышь» и многофункциональных устройств типа «принтер-копир-сканер». Приведены компьютерные модели электромагнитной обстановки в виде картин распределения напряженности электрического поля на частоте 30 кГц, а также в виде картин опасности электромагнитных излучений по критерию допустимого времени. It is proposed the method of forming pictures of the danger of electromagnetic radiation in a limited space with sources of electromagnetic fields according to the criterion of the allowable stay time. The article shows the results of experimental studies of the electromagnetic field from personal computer monitors, optical mice, and multifunctional devices printer-copier-scanner. Computer models of the electromagnetic environment are presented in the form of pictures of the distribution of the electric field strength at a frequency of 30 kHz

scholarly journals Frequency Scaling Based Power Efficient Current Source Design on FPGA

2019 ◽  
Vol 9 (2) ◽  
pp. 1586-1590
Keyword(s):  
Research Work ◽  
Current Source ◽  
Total Power ◽  
Description Language ◽  
Power Efficient ◽  
Total Power Consumption ◽  
Field Programmable ◽  
Hardware Description ◽  
Global Increase ◽  
A Current

Power deficiency is one of the major problems that the whole world is facing now. This is happening because of the immense increase in the world’s population and the global increase of industrialization. So in order to minimize the consumption of power, an energy efficient current source is designed with the help of Field Programmable Gate Array (FPGA). This work gives light on how the power variation takes place in a current source with an increase in frequency value. In this research work, the current source is implemented on 28 nanometers (nm) Airtx-7 FPGA. The work is demonstrated on Xilinx 14.1 ISE simulator. VHSIC Hardware Description Language (VHDL) is used for writing the code of current source. The frequency of current source with Airtx-7 FPGA is increased from 100MHz to 5GHz. It is analyzed that the total power consumption is less as the value of frequency is low. So it is always advisable to operate the device at a lower frequency range in order to save more energy.

Modelling of the Computer Classroom Electromagnetic Field

1970 ◽  
Vol 109 (3) ◽  
pp. 75-80 ◽  
Author(s):  
P. Baltrenas ◽  
R. Buckus ◽  
S. Vasarevicius
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Magnetic Flux ◽  
Electric Field ◽  
Electromagnetic Fields ◽  
Magnetic Flux Density ◽  
Computer Classroom ◽  
Electric And Magnetic Fields ◽  
Long Time ◽  
Video And Audio

Operation of office, video and audio equipment generates electromagnetic fields. Many employees who use computers for a long time complain of headaches and other health troubles. This has become a serious problem as electromagnetic fields are invisible and intangible and an employee, therefore, is unaware of how to protect oneself from them. This work involves modelling of the strengths of computer-generated electric and magnetic fields in the frequency ranges 5 Hz - 2 kHz and 2 kHz - 400 kHz in a computer classroom. After measuring the initial parameters of an electric and a magnetic field, electromagnetic fields propagating in the classroom were modelled with the help of the software VIZIMAG. Propagation and directions of electromagnetic field isolines are also presented. The modelling software VIZIMAG allows us to identify the strength of electric field or the frequency of magnetic field as well as the area of a room where they are present. Separate models are designed for both electric strength and magnetic flux density. Ill. 9, bibl. 11, tabl. 1 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.175

scholarly journals On the electric field transient anomaly observed at the time of the Kythira <i>M</i>=6.9 earthquake on January 2006

2007 ◽  
Vol 7 (6) ◽  
pp. 677-682 ◽  
Author(s):  
A. Konstantaras ◽  
J. P. Makris ◽  
F. Vallianatos ◽  
M. R. Varley
Keyword(s):  
Electromagnetic Field ◽  
Electric Field ◽  
Electromagnetic Fields ◽  
Earthquake Precursor ◽  
Earthquake Precursors ◽  
Seismic Events ◽  
Short Term ◽  
Field Recordings ◽  
Near Space ◽  
Generation Mechanisms

Abstract. The study of the Earth's electromagnetic fields prior to the occurrence of strong seismic events has repeatedly revealed cases were transient anomalies, often deemed as possible earthquake precursors, were observed on electromagnetic field recordings of surface, atmosphere and near space carried out measurements. In an attempt to understand the nature of such signals several models have been proposed based upon the exhibited characteristics of the observed anomalies and different possible generation mechanisms, with electric earthquake precursors (EEP) appearing to be the main candidates for short-term earthquake precursors. This paper discusses the detection of a ULF electric field transient anomaly and its identification as a possible electric earthquake precursor accompanying the Kythira M=6.9 earthquake occurred on the 8 January 2006.

scholarly journals Electromagnetic fields at the sea bottom induced by a line of immersed electric dipoles

2011 ◽  
Vol 83 (3) ◽  
pp. 835-861
Author(s):  
Edson E.S. Sampaio
Keyword(s):  
Electromagnetic Fields ◽  
Electric Dipole ◽  
Sea Water ◽  
Current Source ◽  
Magnetic Vector Potential ◽  
Sea Bottom ◽  
Magnetic Induction Field ◽  
Electric Dipoles ◽  
And Control ◽  
A Current

The analysis of electromagnetic fields caused by alternate or transient electric currents flowing along a cable in sea water has several applications. It supports the interpretation of electromagnetic geophysical data and safety procedures against the threat of sea mines. The approach to the problem employs a magnetic vector potential in the frequency domain due to a pulse source electric dipole, and performs Laplace and Hankel transforms and integration along the cable, to describe the variation of the magnetic induction field due to an electric dipole of finite length. The result is applicable to shallow or deep sea water environments, adaptable to any transmitting current waveform and useful for wave-field separation. The prospects relate to a horizontal receiving coil at the sea bottom and simulate: a minesweeper campaign with a current source at the sea surface or a geophysical survey with a current source close to the sea floor. Therefore, the present analysis may serve: to define parameters in counter-sweeping of submarine mines; to map the conductivity of sediments under shallow waters for the prevention and control of contamination; and as a first approach in the characterization of offshore mineral and oil economic deposits.

scholarly journals Optical properties of c-Plane InGaN/GaN single quantum wells as a function of total electric field strength

2019 ◽  
Vol 58 (SC) ◽  
pp. SCCB09 ◽  
Author(s):  
George M. Christian ◽  
Stefan Schulz ◽  
Simon Hammersley ◽  
Menno J. Kappers ◽  
Martin Frentrup ◽  
...  
Keyword(s):  
Optical Properties ◽  
Field Strength ◽  
Electric Field ◽  
Quantum Wells ◽  
Electric Field Strength ◽  
Single Quantum ◽  
Total Electric Field

Investigating flexible textile-based coils for wireless charging wearable electronics

2019 ◽  
Vol 50 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Danmei Sun ◽  
Meixuan Chen ◽  
Symon Podilchak ◽  
Apostolos Georgiadis ◽  
Qassim S Abdullahi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Dimensional Stability ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Wireless Charging ◽  
The Magnetic Field ◽  
Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

Estimation of electromagnetic field in air by a magnetic dipole in the sea based on a current sheet model

2016 ◽  
Vol 10 (7) ◽  
pp. 709-718
Author(s):  
Honglei Wang ◽  
Kunde Yang ◽  
Kun Zheng ◽  
Yixin Yang ◽  
Yuanliang Ma
Keyword(s):  
Electromagnetic Field ◽  
Current Sheet ◽  
Magnetic Dipole ◽  
A Current

SOLITARY WAVES OF THE NONLINEAR KLEIN-GORDON EQUATION COUPLED WITH THE MAXWELL EQUATIONS

2002 ◽  
Vol 14 (04) ◽  
pp. 409-420 ◽  
Author(s):  
VIERI BENCI ◽  
DONATO FORTUNATO FORTUNATO
Keyword(s):  
Electromagnetic Field ◽  
Solitary Wave ◽  
Electric Field ◽  
Solitary Waves ◽  
Maxwell Equations ◽  
Gordon Equation ◽  
Klein Gordon ◽  
Klein Gordon Equation

This paper is divided in two parts. In the first part we construct a model which describes solitary waves of the nonlinear Klein-Gordon equation interacting with the electromagnetic field. In the second part we study the electrostatic case. We prove the existence of infinitely many pairs (ψ, E), where ψ is a solitary wave for the nonlinear Klein-Gordon equation and E is the electric field related to ψ.

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