18694
This oscillator converts two constant input - flows from a syringe pump into an alternating , periodic output - flow with oscillation periods that can be adjusted to between 0 . 3 s to 4 . 1 h by tuning an external membrane capacitor .
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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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