Results 231 to 240 of about 511,304 (268)
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Excitation transfer in disordered systems
1981Disorder profoundly affects excitation transport in solids. Plane wave solutions lose relevancy, and marked departures from conventional band transport can occur. In particular, in the limit of strong disorder, the wave functions of an otherwise pure crystal become localized. At zero temperature, transport becomes impossible.
T. Holstein, S. K. Lyo, R. Orbach
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On excitable dynamic systems with delays
Kybernetes, 2009PurposeThe purpose of this paper is to discuss the properties of transparency and excitability of positive linear time‐invariant systems under internal point delays.Design/methodology/approachThe problem is solved by combining the algebraic conditions for positivity, excitability, and transparency for the case of linear and time‐invariant dynamic ...
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The Critical Excitation of Nonlinear Systems
Journal of Applied Mechanics, 1977The critical excitation of a mechanical system, in the terminology of this paper, is one that drives the system to a larger response peak than any other in some class of allowed excitations. The critical excitation is of interest in questions related to the reliability and safety because the magnitude of the response peak is frequently an indicator of ...
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OSCILLATIONS IN AN EXCITABLE SYSTEM WITH TIME-DELAYS
International Journal of Bifurcation and Chaos, 2003Transition from excitability to asymptotic periodicity in an excitable system, modeled by the FitzHugh–Nagumo equations, with multiple time-delays, is analyzed. It is demonstrated that, for intermediate time-lags, the system has two coexisting attractors, a hyperbolic stable fixed point and a stable limit cycle.
Nikola Buric, Nebojsa Vasovic
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The brushless excitation system
Electrical Engineering, 1960A NEW TYPE of excitation system has been developed for use in the electric utility industry in which the generator collector and collector brushes, and the exciter commutator and commutator brushes are eliminated. The basic difference between this system and its predecessors is an a-c exciter mounted on the same shaft as the generator field.
R. W. Ferguson, R. Herbst, R. W. Miller
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COORDINATION OF THE EXCITATION SYSTEMS IN A MULTIMACHINE POWER SYSTEM
IFAC Proceedings Volumes, 1983Abstract Each generator in a power system is equipped with an Excitation Control System. Incorrect selection of the parameters of such systems might result in prolonged oscillations among the rotors of the generators. This problem can be overcome with a systematic selection of excitation system parameters so as to achieve optimum damping of all the ...
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System With Excitation Control
International Journal of MC Square Scientific Research, 2011Two ad-hoc, power allocation strategies for a decentralized distributed Space Time Block Coding (Dis-STBC) system is proposed in this paper where knowledge about the Channel State Information (CSI) is not available at the transmitter. The first is an open-loop strategy which requires no control signaling; the second is a feedback-assisted strategy ...
R. Anto Pravin, D. Deva Kirupa Dani
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2013
Constructing a dynamic equivalent for a power system involves several steps: the partition of the system into coherent areas, the aggregation of coherent generator buses, and the aggregation of the coherent generators and their control devices. These steps have been discussed in previous chapters, including a method in Chap.
Joe H. Chow, Ricardo J. Galarza
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Constructing a dynamic equivalent for a power system involves several steps: the partition of the system into coherent areas, the aggregation of coherent generator buses, and the aggregation of the coherent generators and their control devices. These steps have been discussed in previous chapters, including a method in Chap.
Joe H. Chow, Ricardo J. Galarza
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Response of a parametrically-excited system to a nonstationary excitation
2014The response of a parametrically-excited system to a deterministic nonstationary excitation is studied. The system, which has a cubic nonlinearity, has one focus and two saddle points and can be used as a simple model of a ship in the head or follower seas.
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