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In this paper we present a detailed analysis of acoustic cavitation phenomena at 1 MHz ultrasound by means of time - resolved measurements of sonoluminescence , cavitation noise , and synchronized high - speed stroboscopic Schlieren imaging .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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