<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">quartz crystal microbalances</topic></authority><related type="broader"><topic>balances</topic></related><variant type="other"><topic>QCM</topic></variant><variant type="other"><topic>microbalances, quartz crystal</topic></variant><variant type="other"><topic>piezoelectic quartz crystal microbalances</topic></variant><variant type="other"><topic>quartz crystal microbalance</topic></variant> <note xml:lang="en"><![CDATA[ A quartz crystal microbalance is an extremely sensitive sensor which weighs mass per area by measuring change in the freqency of an acoustic resonator. It is composed of a specially cut quartz crystal set between two electrodes that oscillates at its resonance frequency when AC power is applied through the electrodes due to the piezoelectric effect. ]]></note></mads>