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Pulsed-ion techniques are used in a 1-cm ×{} 2.3-cm channel to obtain the first spatially resolved measurements of the vortex-line length-density distribution and the normal-fluid velocity field in turbulent counterflow. Also, an upper limit to the structural anisotropy of the vortex tangle is obtained which contradicts earlier claims.
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Awschalom et al. (1984) studied this question.
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