After it was destroyed during the Hundred Years' War, King Louis XI (1461â1483) rebuilt Chateau chÃ¢teau De langeais into what today is one of the best known examples of late medieval. Architecture it is especially noted for its monumental and highly decorated. chimneypiecesestored in the late 19th century, Chateau chÃ¢teau De langeais came under the control of The institut De, france who own the site. today
The phase shift effect is similar to the Doppler shift observed with sound waves. With the Doppler shift, the sound pitch of an object moving toward your location is higher due to compression of sound waves. As an object moves away from your location, sound waves are stretched resulting in a lower frequency.
Because the blood is moving, the sound undergoes a frequency (Doppler) shift that is described by the Doppler equation: F = Fo (c + v cos(q))/ (c-v cos(q)) where: c is the acoustic velocity in blood, i.e., 1.54 10 5 cm/s; F o is the transmitted frequency; q is the Doppler angle; v is the velocity of the blood.he location of the Doppler sample volume is illustrated by a cursor overlaid on the B-mode image shown as Figure 1. To provide a localised velocity measurement, the instrument transmits a pulse that is 6 wavelengths to 40 wavelengths long-depending on the desired length of the sample volume.