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
What Kate Does had hidden and later talks with Kate at Dharma's dock. He explains that he planned to propose to Juliet and that he blames himself for her death, saying that he convinced her to stay on the island with him because he was lonely. Meanwhile, Jin is caught by the Others, who want to kill him instead of taking him back. Suddenly, someone shoots them and Jin is shocked to see that the shooter is Claire. The episode has received mixed reviews. Critical review aggregate website Metacritic awarded "What Kate Does" a score of 64 out of 100, indicating "generally favorable