Results 271 to 280 of about 18,438,198 (314)

Vacuum-state estimation of vacuum circuit breakers

SPIE Proceedings, 1994
The vacuum state of vacuum switching elements after production is checked normally by Penning- or Magnetron methods (combined electrical and magnetic field). Vacuum in the range of 10-1 - 10-4 Pa can be measured in this way. After assembly into circuit breakers however, these methods are not applicable.
Damstra, G.C., Smeets, R.P.P., Poulussen, H.B.F.   +2 more
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Vacuum-Field Dressed-State Pumping

Physical Review Letters, 1988
The steady-state behavior of two-level atoms, driven by a strong field and relaxing into a frequency-dependent vacuum reservoir, has been studied in an experiment involving Ba atoms in a confocal cavity. Enhancement or suppression of the atomic excitation is observed when the cavity is tuned to either of the strong-field fluorescence sidebands.
, Zhu, , Lezama, , Mossberg, , Lewenstein   +3 more
openaire   +2 more sources

Thermo Field Vacuum States and Phase States

Europhysics Letters (EPL), 1994
We show how thermo field vacuum states can be related to phase and angle states and to Greenberg's infinite statistics.
Črnugelj, Josip, Martinis, Mladen, Mikuta-Martinis, Vesna   +2 more
openaire   +1 more source

Effects of the vacuum state on the statistics of nonclassical states

Physical Review A, 2007
Based on the calculation of the Wigner function, some statistical properties of the superposition of two coherent states with a vacuum state are demonstrated. The distance variation difference function is calculated for these states. Application of homodyne statistics shows that the addition (subtraction) of the vacuum state can improve the classical ...
N. Alioui, A. Amroun-Frahi, C. Bendjaballah   +2 more
openaire   +1 more source

THE VACUUM STATE IN THE HETEROTIC SUPERSTRING THEORY

International Journal of Modern Physics D, 2007
The gravitational vacuum state of the heterotic superstring theory is derived by substituting the maximally symmetric D-space [Formula: see text], where [Formula: see text] is the cosmological constant, into the classical field equations obtained from the effective ten-Lagrangian including quartic higher-derivative terms, [Formula: see text].
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Solid-state and vacuum thermoelements

Proceedings ICT'03. 22nd International Conference on Thermoelectrics (IEEE Cat. No.03TH8726), 2004
Although there is no thermodynamic limit to the dimensionless thermoelectric figure of merit, ZT, a number of authors have reached the conclusion that this quantity will never exceed 4. This prediction was made before the advent of low-dimensional systems and when it seemed to be very difficult to find values of ZT in excess of unity, particularly at ...
openaire   +1 more source

Vacuum metallurgy in the United States

Vacuum, 1956
Abstract The author discusses the various forms of vacuum processing existent in the metallurgical industry today. Detailed attention is given to all aspects of vacuum induction melting, such as furnace design, pumping plant, refractories employed, typical reactions leading to the purification of the processed material and properties of the product.
openaire   +1 more source

Arc voltage analysis for vacuum state estimation in vacuum interrupters

20th International Symposium on Discharges and Electrical Insulation in Vacuum, 2003
In this paper the arc voltage of a vacuum interrupter, switching a 10 A DC current, is evaluated. Voltage peaks are counted during 6 ms and represented in histograms. These histograms are unambiguously discriminative for pressures above 3*10/sup -2/ Pa. Beyond this pressure a sharp change in the performance of the arc voltage is visible.
Anghelita, P., Kerkenaar, R.W.P., Merck, W.F.H.   +2 more
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Sigma state and vacuum replica

AIP Conference Proceedings, 2004
The vacuum structure of a model for QCD with the four‐quark interaction is studied and excited solutions — replicas — of the mass‐gap equation are found, as a consequence of chiral symmetry breaking, which co‐exists with the true vacuum of the theory. Quantum field theory is used to describe these new scalar states and the local operator creating the ...
openaire   +1 more source

Quantum-state homodyne measurement with vacuum ports

Physical Review A, 1996
We show that the quantum state of an N-mode light field can be reconstructed from the difference statistics recorded in multiport homodyning with N unused input ports. The theory is applied to balanced homodyne six-port detection, which is shown to be suited for measuring the Q function of a single-mode radiation field.
, Zucchetti, , Vogel, , Welsch
openaire   +2 more sources