Anemometer turbines usually requires a refresh rate of wind speed measurements of 3 Hz, easily achieved by sonic anemometers. Three-dimensional sonic anemometers are widely used to measure gas emissions and ecosystem fluxes using the eddy covariance method when used with fast-response infrared gas analyzers or laser-based analyzers. Two-dimensional wind sensors are of two types: Acoustic resonance anemometers are a more recent variant of sonic anemometer. The technology was invented by Dr Savvas Kapartis and patented in 2000. Whereas conventional sonic anemometers rely on time of flight measurement, acoustic resonance sensors use resonating acoustic (ultrasonic) waves within a small purpose-built cavity in
2002 Oregon Ballot Measure 27 of the GMO market, donated $1.5 million to the effort against the measure. Overall, opponents spent $5.5 million, tying an Oregon spending record. 2002 Oregon Ballot Measure 27 Ballot Measure 27 of 2002 would have required the mandatory labelling of all genetically modified food sold in the U.S. state of Oregon. The measure was defeated in the November 5, 2002 general election with 371,851 votes in favor, 886,806 votes against. The measure was placed on the ballot as a result of initiative petition. Proponents of the measure argued that "Oregonians should have the right to know what they are eating."