Astronomical measurements of motion frequently utilize the Doppler effect, observing shifts in wavelength (or frequency) of emitted waves from moving sources, analogous to a changing siren pitch.

Combining concepts from Doppler-free spectroscopy, coherent quantum control and frequency comb spectroscopy leads to new opportunities for the precision excitation of atomic species with high ...

To evaluate real-time duplex colour Doppler examination with colour and pulse Doppler ultrasonography (US) (colour Doppler imaging (CDI)) for detection of the retinal detachment from membranous ...

A systematic review and meta-analysis found that ultrasound had a high diagnostic accuracy for testicular torsion, with colour Doppler sonography achieved a sensitivity of 95.3% and a specificity of ...