Results 161 to 170 of about 450,240 (212)

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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The Berry phase and the Hannay angle

Physical Review D, 1988
The analysis provided by Berry of the extra phase acquired by a system undergoing adiabatic excursion in a closed path in parameter space is extended in this paper to the case of nonstationary states. It is shown that, for certain integrable dynamical systems, wave packets exist which under continuation in parameter space behave in a manner that can be
, Ghosh, , Dutta-Roy
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The Diagnostic Value of Phase-Angle Tympanograms

International Journal of Audiology, 1981
The diagnostic value of susceptance, conductance, resistance, reactance, admittance and phase-angle tympanograms is compared. Phase-angle tympanograms seem to be best suited for the discrimination between normal W patterns and broad irregular curves obtained from ossicular disruptions, luxations and necroses.
W L, Creten, K J, Van Camp, M A, Maes, P M, Vanpeperstraete   +3 more
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Phase angle and mortality: a systematic review

European Journal of Clinical Nutrition, 2018
The phase angle, expressed through bioelectrical impedance, has been studied as a prognostic marker in several health conditions. As this issue is still conflicting, the question whether this parameter correlates with mortality in the most diverse clinical situations remains.
Luíza M, Garlini, Fernanda D, Alves, Luciane B, Ceretta, Ingrid S, Perry, Gabriela C, Souza, Nadine O, Clausell   +5 more
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Phase angle as a marker for sarcopenia in cirrhosis

Clinical Nutrition ESPEN, 2019
In patients with cirrhosis nutritional disturbances can progress to sarcopenia, worsening the disease prognosis. Phase angle (PA) may be a useful marker for sarcopenia in this clinical population reflecting the cellular integrity level. This cross-sectional and prospective study evaluated the association between low PA values and clinical/nutritional ...
Dannieli do, Espirito Santo Silva, Dan Linetzky, Waitzberg, Rosângela, Passos de Jesus, Lucivalda Pereira Magalhães de, Oliveira, Raquel Susana, Torrinhas, Giliane, Belarmino   +5 more
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The Phase Angle of Current Transformers

Transactions of the American Institute of Electrical Engineers, 1915
A method of testing the phase angle of current transformers by comparing readings obtained on a wattmeter whose current circuit is first connected to receive a part of the primary current (the remainder of the primary current passing in shunt through resistance) and then connected to the secondary circuit; the potential circuit is supplied from the ...
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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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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 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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The Weyl Quantization of Phase Angle

Journal of Modern Optics, 1992
We suggest a candidate for a non-canonical Hermitian operator corresponding to phase angle, based on the Weyl correspondence rule. The matrix elements of this operator, for harmonic oscillator number states, coincide, in the correspondence limit, with those of a phase operator proposed by Barnett and Pegg, when the dimension of their defining space ...
T.B. Smith, D.A. Dubin, M.A. Hennings
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