Results 261 to 270 of about 5,498 (306)

Imaging And Inversion Of Transient Electromagnetic Soundings

8th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 1995
The success of geophysical investigations associated with environmental problems is to a large extent determined by the density of the measurements and the quality of the interpretations. Many case studies of mapping of raw materials and hydrogeological investigations have confirmed that dense measurements with traditional methods of geoelectrical and ...
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Electromagnetic transient testing

1994
In this brief introduction to the nature of transients and disturbance to power distribution systems it has only been possible to acquaint the reader with the broad categories of effects and show some examples of applicable standards and specifications.
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The transient electromagnetic field of a dielectric layer

Applied Mathematics and Computation, 2004
For many years the correlation between the propagation of electromagnetic waves in the atmosphere and meteorological conditions has been a topic of study. The present paper treats this problem in the context of an electromagnetic impulse in an abnormal stratification of the lower troposphere, where the stratification layer is called a surface duct. The
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An Electromagnetic Flowmeter for Transient Flow Studies

Review of Scientific Instruments, 1951
An adaptation of the electromagnetic flowmeter has been made for the observation of transients in liquid flows. The device responds to flow transients of 0.001-sec duration, and is not affected by ambient pressure changes or the velocity profile of the liquid in the conduit. The effects of fluid resistivity on the instrument are noted.
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Electromagnetic transient simulation

1998
This chapter discusses electromagnetic transient simulation. The simulation of electromagnetic transients associated with HVDC schemes is carried out to assess the nature and likely impact of overvoltages and currents, and their propagation throughout both the AC and DC systems.
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Measurement and Observation of Electromagnetic Transients

2019
Power electronic systems consist of interactions between the information and energy. To implement the effective energy propagation through the control system, the related energy-flow information needs be fed back to the control unit, i.e., measurement and analysis.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu   +3 more
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Electromagnetic transient simulation studies

1999
This chapter describes some research results of EMTP-based digital studies of SPWM UPFC. Useful insights into UPFC performance have been attained through detailed analysis and simulation of the UPFC internal structure and regulation method. Voltage and power control simulation results have demonstrated the functions of the UPFC.
J. Y. Liu, Y. H. Song
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Continuous Transient Electromagnetic Sounding

1st EEGS Meeting, 1995
Steadily growing abstraction of ground water together with the impact of pollution from surface infiltration have increased the need for hydrogeological investigations of aquifers. The mapping of subsurface resistivity structures using electrical and electromagnetic methods has gained a central role in the set-up of hydrogeological models of catchments
K. I. Sorensen, F. Effers
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Transient electromagnetic interference in substations

IEEE Transactions on Power Delivery, 1994
Electromagnetic interference levels on sensitive electronic equipment are quantified experimentally and theoretically in air and gas insulated substations of different voltages. Measurement techniques for recording interference voltages and currents and electric and magnetic fields are reviewed and actual interference data are summarized. Conducted and
C.M. Wiggins, D.E. Thomas, F.S. Nickel, T.M. Salas, S.E. Wright   +4 more
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Chirality and the transient electromagnetic pulse

IEEE Antennas and Propagation Society International Symposium 1992 Digest, 1992
The one-dimensional plane wave propagation of a transient TEM (transverse electromagnetic) pulse in a homogeneous isotropic chiral material is analyzed. Using asymptotic techniques the authors have derived expressions for the electric field at various times of interest and observed similarities and differences between transient responses in chiral and ...
P.G. Zablocky, N. Engheta
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