Results 241 to 250 of about 519,674 (299)
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Current singularities: Drivers of impulsive reconnection
Physics of Plasmas, 2005Reconnection 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 +2 more
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Measurement of impulse current by laser current transformer
Proceedings of the IEEE, 1968Sharp impulse current from a high-voltage impulse generator has been measured by a laser current transformer based on the Faraday rotation of a laser beam. The impulse waveform measured by the laser agreed well with the waveform measured by a conventional method using a noninductive resistor.
S. Takeshita, T. Sasano
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Thin film eddy current impulse deicer
28th Aerospace Sciences Meeting, 1990Two new styles of electrical impulse deicers has been developed and tested in NASA's Icing Research Tunnel. With the Eddy Current Repulsion Deicing Boot (EDB), a thin and flexible spiral coil is encapsulated between two thicknesses of elastomer. The coil, made by an industrial printed circuit board manufacturer, is bonded to the aluminum aircraft ...
SAMUEL SMITH, PETER ZIEVE
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Impulse approximation with current conservation
Physical Review C, 1980It 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.
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Reflection Impulsivity in Current and Former Substance Users
Biological Psychiatry, 2006Chronic drug use is associated with increased impulsivity, risky decision making, and impaired behavioral control, but the underlying mechanisms of this neurocognitive profile remain unclear. We investigated impulsive responding in the context of decision making, using a novel behavioral measure of reflection impulsivity: the tendency to gather and ...
Luke, Clark +3 more
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IEC 60060-1 Requirements in Impulse Current Waveform Parameters
International Journal of Emerging Electric Power Systems, 2005There are IEC 60060-1 requirements on three impulse current waveforms. For the damped-oscillating waves, margins of the front time T1 and the time to half the peak T2 are 10 per cent whilst any value after the polarity reversal has to be less than 20 per cent of the peak value.
S. Sato, T. Harada, M. Hanai
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Outline of theory of impulse currents
Proceedings of the American Institute of Electrical Engineers, 1916In Part I it is shown how, from the integral of the general differential equation of the electric circuit, which has been discussed in a previous paper, all the types of electric currents are derived as special cases, corresponding to particular values of the integration constants. The equations of the circuits with massed constants, that is, the usual
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Impulse Commutated Zero Current Switching Current-fed Three-phase DC/DC Converter
IEEE Transactions on Industry Applications, 2014An impulse-commutated current-fed three-phase dc/dc converter is proposed. It is a three-inductor current divider topology that reduces the current stress of the components. The proposed converter attains zero current switching (ZCS) of the semiconductor devices via impulse commutation utilizing the circuit paracitics.
K Radha Sree, Akshay Kumar Rathore
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High-Impulse Current and Voltage Measurement
IEEE Transactions on Instrumentation and Measurement, 1970This 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 ...
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Radiation of two small impulse current radiators
2016 8th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS), 2016The problem of transient radiation of two small impulse current radiators is solved by vector potential method in time domain. The result is compared with the same problem for the single radiator. It is considered the classical solution for transient dipole and improved one obtained by more strict expansion for vector potential in time domain.
O.M. Dumin +4 more
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