Word: doppler
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...provide what radar meteorologists refer to as "ground truth." At the time, the NSSL was developing a radar capable of detecting areas of strong rotation inside big tornado-producing storms. The chasers provided visual proof that particular radar signatures did indeed precede the formation of tornadoes. The new radar, Doppler radar, made use of the fact that radio waves shift frequency depending on whether the objects they bounce off are advancing or receding. In this case, the objects that create the Doppler shift are water droplets inside storm clouds. As the winds inside these clouds begin to spin, the droplets...
...motion will cause light waves coming from the star to be squeezed together, then stretched apart--making the light look first a little bit bluer than it really is, then a little bit redder, then bluer again, and so on. These subtle color changes--examples of the so-called Doppler shift--can be precisely measured, and the magnitude of the wobble pinned down, with a device called a spectrometer...
Transporters can send people instantly from one location to another by converting their molecules into energy, then reassembling them. Every living being has a distinct pattern of molecules; the pattern buffer fixes the configuration by adjusting for the Doppler effect -- the apparent change in the frequency of the energy waves caused by motion...
...theoretical limit for a reasonably accurate forecast is less than two weeks. But within this time frame, a number of innovations have enhanced the meteorologist's prophetic powers. Supercomputers build mathematical models that show the interaction of wind, sun, temperature and humidity across the entire globe. And Doppler radar -- the technology at the heart of the Norman station -- is adept at spotting the destructive midsize squalls that have traditionally taken forecasters by surprise. By bouncing microwaves off the tiny droplets in the center of a cloud and picking up the echoes, Doppler systems can map the relative velocity of wind...
...motion, Bloom has also composed scores for the famed Pilobolus Dance Theater and the repertory theater at Yale, where she earned a master's in sax in 1977. She uses a synthesizer, controlled by foot pedals, to amplify her ethereal solos into swirls of sound that evoke the Doppler effect, the drop in pitch that occurs when a train rushes by with its horn blaring. Bloom has six times been cited in Down Beat's annual critics' poll as a talent deserving wider recognition. As to why she first took up the notoriously cranky instrument, she has a winning answer...