Results 301 to 310 of about 1,908,179 (350)

Gains, Phases and Angles

IFAC Proceedings Volumes, 1984
Abstract Any interactive computer-aided design technique for multivariable feedback systems is critically dependent on the deployment of an appropriate set of indicators with Which to assess stability, performance and robustness. Appropriate generalizations of the classical feedback concepts of gain and phase are developed for this purpose.
Hung, YS, Macfarlane, AGJ
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Geometric quantum phase and angles

Physical Review D, 1988
The geometric phase in quantum mechanics is formulated for charged particles in a gauge-invariant, geometric manner. It is then extended to an evolution resulting from a sequence of measurements as in the work of Pancharatnam and Aharonov and Vardi. Its close connection to the Feynman formulation of quantum mechanics is pointed out.
, Anandan, , Aharonov
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Phase Transitions in Angle Variables

Physical Review Letters, 2003
Phase transitions in angle variables are studied. An example of angular phase transition, an axially to triaxially deformed "shape" transition in nuclei, is discussed. Spectroscopic signatures for the occurrence of these transitions are suggested. Preliminary experimental evidence is presented.
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Phase-Angle Control of System Interconnections

Transactions of the American Institute of Electrical Engineers, 1939
This paper describes an application of a new method of automatic control between two interconnected power systems, whereby greater utilization of the interconnection capacity is secured. As the stable limit of the interchange between systems is affected by variations in the magnitude and location of intermediate loads on the respective systems, direct ...
R. E. Pierce, B. W. Hamilton
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Very fast phase angle estimation algorithm for a single-phase system having sudden phase angle jumps

Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2003
This work proposes a very fast phase angle estimation algorithm for a single-phase system under a sudden phase angle jump condition. When a source voltage changes in a step manner, the normal phase angle detector, such as a phase locked loop (PLL) and a (low pass) filter, typically generates phase delay and results in a sluggish response, and causes ...
null Hong-Seok Song, null Kwanghee Nam, P. Mutschler   +2 more
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A phase angle standard

Measurement Science and Technology, 2004
A phase angle standard for power frequencies (40–400 Hz) with a very low measuring uncertainty of 3 µrad is developed. The standard is based on a two-channel high-stability arbitrary waveform AC source for voltages up to 120 V and currents up to 6 A with high phase angle resolution which is realized as a development device with full computer control. A
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Phase angle regulating transformer protection

IEEE Transactions on Power Delivery, 1994
This paper describes the protection of a 345 kV, 450 MVA three phase, phase angle regulating (PAR) transformer. The transformer includes load tap changers which permit phase angle variations of 25/spl deg/ advance to 25/spl deg/ retard in a total of 32 steps (16 advance, 16 retard).
M.A. Ibrahim, F.P. Stacom
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Ratiometer phase angle indicator

Journal of Scientific Instruments, 1960
The principle of the moving coil ratiometer is described together with the circuit used with it for phase angle measurement. The mode of operation, performance, adjustment, and calibration are given.
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Ultralinear small-angle phase modulator

Proceedings of the 45th Annual Symposium on Frequency Control 1991, 2002
A DC electric field applied to a quartz plate resonator causes changes in the elastic constants which can lead to a change in the frequency of the resonator. This effect, known as the polarizing effect, has been shown to be extremely linear. A method for measuring the polarizing effect in high-Q SC-cut 5-MHz quartz resonators for small AC electric ...
J. Lowe, F.L. Walls
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Progress in phase angle thermography

Review of Scientific Instruments, 2003
Phase angle thermography is basically spatially multiplexed photothermal radiometry. It provides images for remote detection and imaging of damage. For energy deposition one can use external heat sources (e.g., light or convective heating) or internal heat generation (e.g., electric current, microwaves, eddy current, or elastic wave).
A. Dillenz, T. Zweschper, G. Riegert, G. Busse   +3 more
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