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[Doppler effect in cardiology. Continuous Doppler, pulsed Doppler, Doppler color].
Presse medicale (Paris, France : 1983), 1989Echocardiography has contributed to the exploration of the heart by providing much information, and it has even given rise to new semiological concepts. However, abnormalities of intracardial blood flow, notably shunts and regurgitations, could only be diagnosed indirectly from their effects on cardiac cavities.
Y, Houdas +3 more
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American Journal of Physics, 1972
Expressions for the Doppler effect are derived without employing any assumption about the phase of a plane wave. It is shown that the invariance of this phase under both the Galilean and the Lorentz transformations is a trivial consequence of the mathematics and, is independent of its association with any physical process.
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Expressions for the Doppler effect are derived without employing any assumption about the phase of a plane wave. It is shown that the invariance of this phase under both the Galilean and the Lorentz transformations is a trivial consequence of the mathematics and, is independent of its association with any physical process.
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2020
In every advanced course on physics the Doppler, effect is usually the standard example for demonstrating the fundamental physical differences between the propagation of elastic waves through a mechanical medium and the propagation of electromagnetic waves through our physical space.
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In every advanced course on physics the Doppler, effect is usually the standard example for demonstrating the fundamental physical differences between the propagation of elastic waves through a mechanical medium and the propagation of electromagnetic waves through our physical space.
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The Journal of the Acoustical Society of America, 2010
The Doppler effect describes the change in frequency observed for a moving source and/or receiver. A common example of the Doppler effect involves a moving vehicle sounding a siren or horn as it approaches, passes, and recedes from an observer. The observed frequency (compared to the emitted frequency) is higher during the approach, is identical at the
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The Doppler effect describes the change in frequency observed for a moving source and/or receiver. A common example of the Doppler effect involves a moving vehicle sounding a siren or horn as it approaches, passes, and recedes from an observer. The observed frequency (compared to the emitted frequency) is higher during the approach, is identical at the
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Interferometry and the Doppler Effect
Applied Optics, 1969D, Malacara, I, Rizo, A, Morales
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1987
The velocity of electromagnetic radiation in a vacuum is a constant which depends only upon the magnetic permeability and electrostatic permittivity of free space. This velocity is independent of any movement of the source or observer, but the same is not true of the wavelength and frequency of radiation.
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The velocity of electromagnetic radiation in a vacuum is a constant which depends only upon the magnetic permeability and electrostatic permittivity of free space. This velocity is independent of any movement of the source or observer, but the same is not true of the wavelength and frequency of radiation.
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Abstract This chapter explores how the Doppler Effect, first described by Austrian physicist Christian Doppler in 1842, was crucial to extracting scientific value from Sputnik’s radio signal. The frequency shifts in the signal provided information about the satellite’s speed and trajectory.
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Smart Doppler Cloak Operating in Broad Band and Full Polarizations
Advanced Materials, 2021Qiang Cheng +2 more
exaly