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Doppler-shifted sign

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  • Doppler effect — Change of wavelength caused by motion of the source. An animation illustrating how the Doppler effect causes a car engine or siren to soun …   Wikipedia

  • Medical ultrasonography — This article is about using ultrasound to image the human body. For imaging of animals in research, see Preclinical imaging. Sonography redirects here. For the tactile alphabet called sonography , see Night writing. Medical ultrasonography… …   Wikipedia

  • geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… …   Universalium

  • Ammonia — For other uses, see Ammonia (disambiguation). Ammonia …   Wikipedia

  • Tachyon — A tachyon (from the Greek polytonic|ταχυόνιον, takhyónion , from polytonic|ταχύς, takhýs , i.e. swift, fast) is any hypothetical particle that travels at faster than light speed. The first description of tachyons is attributed to German physicist …   Wikipedia

  • Hubble's law — Physical cosmology Universe · Big Bang …   Wikipedia

  • Freese-Notis — Infobox Company company name = Freese Notis Weather company type = Private foundation = Ames, Iowa (1973) location city = Des Moines, Iowa location country = USA key people = Harvey Freese, Co founder Charles Notis Co founder D. R. Arthur, CIO… …   Wikipedia

  • Pulse compression — is a signal processing technique mainly used in radar, sonar and echography to augment the range resolution as well as the signal to noise ratio. This is achieved by modulating the transmitted pulse and then correlating the received signal with… …   Wikipedia

  • plasma — plasmatic /plaz mat ik/, plasmic, adj. /plaz meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. cytoplasm. 3. whey. 4. a green, faintly translucent chalcedony. 5. Physics. a …   Universalium

  • ionosphere and magnetosphere — ▪ atmospheric science Introduction       regions of Earth s (Earth) atmosphere in which the number of electrically charged particles ions (ion) and electrons (electron) are large enough to affect the propagation of radio waves (electromagnetic… …   Universalium

  • Traditions of Texas A&M University — Texas A M University Aggieland water tower The traditions of Texas A M University are a key aspect of the culture of Texas A M University. Some of the school traditions date to the 1890s, shortly after the opening of the school, while others have …   Wikipedia

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