Sound transformation in a turbulent medium

Belyan, A. V.; Moiseev, S. S.; Petrosyan, A. S.

doi:10.1016/0375-9601(91)90589-z

Cited by 2 publications

(1 citation statement)

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“…large-scale helicity). Really, simultaneous consideration of memory effects and second-order approximation indicate effective influence of helicity on turbulent viscosity [53,54] and turbulent diffusivity [50,55,56] already in the limit of small or infinite correlation time.…”

Section: Introductionmentioning

confidence: 99%

Influence of helicity on scaling regimes in model of passive scalar advected by the turbulent velocity field with finite correlation time

et al. 2006

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The advection of a passive scalar quantity by incompressible helical turbulent flow has been investigated in the frame of an extended Kraichnan model. Statistical fluctuations of the velocity field are assumed to have the Gaussian distribution with zero mean and defined noise with finite time-correlation. Actual calculations have been done up to twoloop approximation in the frame of the field-theoretic renormalization group approach. It turned out that the space parity violation (helicity) of a stochastic environment does not affect anomalous scaling which is the peculiar attribute of corresponding model without helicity. However, stability of asymptotic regimes, where anomalous scaling takes place, and the effective diffusivity strongly depend on the amount of helicity.

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Section: Introductionmentioning

confidence: 99%

Influence of helicity on scaling regimes in model of passive scalar advected by the turbulent velocity field with finite correlation time

et al. 2006

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Superconductor–normal–superconductor step-edge junctions with Au barriers

Bode

Grove

Siegel

et al. 1996

Journal of Applied Physics

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YBa2Cu3O7−δ superconductor–normal–superconductor junctions in step-edge geometry are fabricated by an in situ process using off-axis sputter deposition. Gold is used as the normal metal interlayer. A special inhibiting layer is introduced to ensure proper separation of the superconducting electrodes. The temperature dependence of the critical current Ic is nearly linear. The junctions show high normal resistances up to RN=10 Ω and high IcRN products up to 8.8 mV at 4.2 K. I–V characteristics exhibit a large excess current Iex over the whole temperature range, even for electrically narrow junctions. The power dependence of Shapiro step heights shows characteristic deviations from the resistively and capacitively shunted junction model. Calculations using the time-dependent Ginzburg–Landau equations are carried out to model the measured I–V characteristics with and without microwave irradiation. A point-contact-like superconductor–constriction–superconductor model is suggested to explain the excess current and the measured temperature dependence of Ic and Iex. Time-dependent Ginzburg–Landau equations are used to account for the observed dynamic characteristics.

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Sound transformation in a turbulent medium

Cited by 2 publications

References 1 publication

Influence of helicity on scaling regimes in model of passive scalar advected by the turbulent velocity field with finite correlation time

Influence of helicity on scaling regimes in model of passive scalar advected by the turbulent velocity field with finite correlation time

Superconductor–normal–superconductor step-edge junctions with Au barriers

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