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The velocity of ultrasonic waves traveling in a media reflects the dynamic properties of that media, which should depend on the physical properties. Taking advantage of the easy-operation and non-destructive nature of the ultrasonic technology, it is possible to determine some physical properties of frozen soils indirectly by using this technique, either in(More)
High order modes have been successfully damped in the existing NSLS accelerating cavities by the insertion of damping antennae. The location of the antennae was aided by cavity field plots using superfish and their lengths determined experimentally. A description of their construction is presented together with the results of their insertion upon higher(More)
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