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The present status of the atomic and molecular database required in fusion plasma edge modelling and diagnostics is briefly reviewed. Emphasis is placed on the evaluated and recommended data, and on the existing gaps and uncertainties in the database. Spectroscopic, collisional and surface data are considered.

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An experimental study of the noise produced by a single cavitation bubble has been made. The noise consists principally of a transient pressure pulse associated with the collapse of the bubble. The motion of the bubble has been photographed simultaneously with the measurement of the pressure pulse.

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