Doppler Ultrasonography
Doppler ultrasonography is a noninvasive, non-x ray, painless diagnostic procedure that can detect the direction, velocity, and turbulence of blood flow. It is frequently used ...
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Doppler Effect
The Doppler effect was named after Christian Johann Doppler. This Austrian physicist observed and explained the changes in pitch and frequency of sound and light waves, as well as all o...
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Time is one of the seven fundamental quantities in nature. I made a case in the last installment of this column (1) that mechanical devices for measuring time — clocks — might be consid...
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Doppler Ultrasonography
Doppler Effect
Atomic Clocks: An Application of Spectroscopy
