in-phase sign

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• Phase 1 (bar) — Phase 1, also known as “The Phase”, is a lesbian bar and nightclub at 525 8th Street SE in Washington, D.C.. Located one block south of Pennsylvania Avenue SE near Eastern Market in the Capitol Hill neighborhood, Phase 1 is the oldest continually …   Wikipedia

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• Phase inversion — A phase inversion is the introduction of a phase difference of 180° into a waveform. As such, it is more properly called a polarity inversion, as phase can differ relative to frequency but polarity is absolute.For example, in a push pull power… …   Wikipedia

• Numerical sign problem — The numerical sign problem refers to the difficulty of numerically evaluating the integral of a highly oscillatory function of a large number of variables. Numerical methods fail because of the near cancellation of the positive and negative… …   Wikipedia

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• Quasi-phase-matching — is a technique in nonlinear optics which allows a positive net flow of energy from the pump frequency to the signal and idler frequencies by creating a periodic structure in the nonlinear medium. Momentum is conserved, as is necessary for phase… …   Wikipedia

• Stationary phase approximation — In mathematics, the stationary phase approximation is a basic principle of asymptotic analysis, applying to oscillatory integrals taken over n dimensional space Rn where i is the imaginary unit. Here f and g are real valued smooth functions. The… …   Wikipedia

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• Dallas Phase — (c. 1300–1600 CE) is an archaeological phase, within the Mississippian III period, in the South Appalachian Geologic province.[1][2] Contents 1 Geography 2 Characteristics …   Wikipedia