Concept

Convective instability

Publications associées (120)

Vertical instability in TCV: Comparison of experimental and theoretical growth rates

Jean-Marc Moret, Ivo Furno, Jonathan Bryan Lister

Growth rates of the axisymmetric mode in vertically elongated plasmas in the Tokamak a Configuration Variable (TCV) are measured and compared with numerically calculated growth rates for the reconstructed equilibria. This comparison is made over a range of ...

1997

Evaluation of adiabatic frequency-modulated schemes for broadband decoupling in isotropic liquids

Geoffrey Bodenhausen

Line broadening in high-resoln. NMR spectra caused by heteronuclear scalar coupling is described, and various adiabatic frequency-modulated decoupling schemes in high-resoln. NMR spectroscopy are compared. The CHRIP-95 decoupling scheme, which uses a linea ...

1996

Convective scaling of the average dissipation rate of temperature variance in the atmospheric surface layer

Marc Parlange

The flux of sensible heat from the land surface is related to the average rate of dissipation of temperature fluctuations in the atmospheric surface layer through the temperature variance budget equation. In many cases it is desirable to estimate the heat ...

1996

Response Mechanism of Anion-Selective Electrodes Based on Mercury Organic Compounds as Ionophores

New mercury organic compounds with 1-3 metal centers and different substituents were synthesized as anion-selective ionophores. They were incorporated into solvent polymeric membranes, and the selectivity, slope of response, response time, emf repeatabilit ...

1996

On locating the poloidal field coils for tokamak vertical position control

Yves Martin, Jean-Marc Moret, Jonathan Bryan Lister

The TCV tokamak has 16 poloidal field coils for plasma shaping, distributed around the vacuum vessel. Experiments are described that determine the relative merits of different coil positions for controlling the unstable vertical movement of elongated plasm ...

1996

The spatial structure of turbulence at production wave-numbers using orthonormal wavelet

Marc Parlange, Gabriel George Katul

Orthonormal wavelet expansions are applied to surface-layer measurements of vertical wind speed under various atmospheric stability conditions. The orthonormal wavelet transform allows for the unfolding of these measurements into space and scale simultaneo ...

1995

Sensible and latent-heat flux predictions using conditional sampling methods

Marc Parlange, Gabriel George Katul, Scott W. Tyler

The conditional sampling formulation typically used in eddy accumulation flux measurements was tested at two sites using velocity, temperature, and specific humidity time series measurements. The first site was at Owen's Lake in southern California, and th ...

1994

Active Feedback Stabilization of Axisymmetrical Modes in Highly Elongated Tokamak Plasmas

Active feedback stabilization of the vertical instability is studied for highly elongated tokamak plasmas (2 less-than-or-equal-to kappa less-than-or-equal-to 3) and evaluated in particular for the TCV configuration. It is shown that the feedback can stron ...

1994

Convection-Diffusion Competition Within Mixed Layers of Stratified Natural Waters

Damien Bouffard, Oscar Rodrigo Sepúlveda Steiner

In stratified natural waters, convective processes tend to form nearly homogeneous mixed layers. However, shear-driven turbulence generated by large-scale background flow often rapidly smooths them through mixing with the stratified surroundings. Here we s ...

AMER GEOPHYSICAL UNION0

Wake flow variability in a wind farm throughout the diurnal cycle

Fernando Porté Agel, Mahdi Abkar

The atmospheric boundary layer (ABL) undergoes substantial changes in its structure and dynamics in the course of a day due to the transient nature of forcing factors such as the surface fluxes of heat and momentum. The non-stationary nature of the mean wi ...

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