Results 291 to 300 of about 523,735 (343)

Current singularities: Drivers of impulsive reconnection

Physics of Plasmas, 2005
Reconnection in nature is generically not quasi-steady. Most often, it is impulsive or bursty, characterized not only by a fast growth rate but a rapid change in the time-derivative of the growth rate. New results, obtained by asymptotic analyses and high-resolution numerical simulations [using Adaptive Mesh Refinement] of the Hall magnetohydrodynamics
A. Bhattacharjee, K. Germaschewski, C. S. Ng   +2 more
openaire   +1 more source

Impulse approximation with current conservation

Physical Review C, 1980
It is found that, if the off-shell form factors for nucleons can be invoked to ensure current conservation during the instantaneous absorption of the four-momentum transfer by a particular constituent nucleon, the nuclear current in the resultant impulse approximation is conserved in the operator sense.
openaire   +1 more source

Impulse Current Transformer With a Nanocrystalline Core

IEEE Transactions on Magnetics, 2013
The objective of this paper is to propose and to validate the behavior of an impulse current transformer with a nanocrystalline alloy toroidal core. The purpose of this transformer is to measure a current square waveform with a fundamental harmonic frequency of 25 kHz.
R. Prochazka, J. Hlavacek, K. Draxler
openaire   +1 more source

“Current place of impulse oscillometry in the assessment of pulmonary diseases.”

Respiratory Medicine, 2020
In 1956, a diagnostic tool using the forced oscillation technique (FOT) was developed to examine respiratory functions. A modification of this method is impulse oscillometry (IOS). In the latter, a loudspeaker delivers to the respiratory system a regular, square pressure wave at a constant frequency from which all other individual frequencies are ...
Marcin, Bednarek, Marcin, Grabicki, Tomasz, Piorunek, Halina, Batura-Gabryel   +3 more
openaire   +2 more sources

Wirewound Shunts For Measurement Of Fast Current Impulses

IEEE Transactions on Power Apparatus and Systems, 1984
The paper describes the operating principle, design features and measuring characteristics of wirewound shunts. Fast response and reduced thermal-resistance drift are the main goals to be achieved, although a sturdy structure is also required to meet the demands of an industrial laboratory environment.
openaire   +1 more source

High Impulse Currents

2019
Tests with high impulse currents are performed to simulate the stress of power apparatus in the high-voltage grid caused by lightning and short circuits. Various impulse test currents and the corresponding measurement methods are standardized in IEC 62475, together with DC and AC currents.
openaire   +1 more source

Design and realization of a current sensor for impulse current waveform measurement

2016 IEEE Conference on Electromagnetic Field Computation (CEFC), 2016
This paper presents a current sensor for current measurement in high frequency high voltage pulse power supplies, the output of which is DC current superposed with impulse current waveform. The current sensor is made of two magnetic cores. One works in fluxgate principle to measure DC current. While the other is based on transformer effects for impulse
Xiaoguang Yang, Bo Zhu, Congcong Li, Shuangshuang Jin, Lijing Gao, Shuai Zhang   +5 more
openaire   +1 more source

Measurement of High-Current Impulses

2013
For the conventional measurement of impulse currents during tests of power apparatuses up to a few 100 kA, low-ohmic resistors or magnetic coils are used in combination with digital recorders enabling computer-aided processing of the recorded data.
openaire   +1 more source

Current Sheet Structure in an Inductive-Impulsive Plasma Accelerator

AIAA Journal, 1971
Probe and laser light-scattering measurements of electron density have been made in the current sheet of a pulsed inductive accelerator. The discharge consists of a thin flat disk of pure je current. The only current carriers are electrons. The gas is ionized and swept up into a 4 mm thick current sheet.
C. DAILEY, R.H. LOVBERG
openaire   +1 more source

High-Impulse Current and Voltage Measurement

IEEE Transactions on Instrumentation and Measurement, 1970
This paper is a survey of methods of high-impulse current and voltage measurement. Typically, such measurement techniques must now include capabilities for measuring high-energy impulses having peak powers as high as many megawatts, currents as high as many mega-amperes, or voltages as high as several megavolts, with rise times as short as a fraction ...
openaire   +1 more source