I thought of the great
precessional cycle that the pole of the earth describes.
STIR relies on T1 relaxation differences instead of
precessional frequency differences to cancel the signal from fat, thereby minimising susceptibility effects during fat-suppressed imaging.
When fat and water molecules occupy the same voxel, differences in
precessional frequency quench MR signal in that voxel during opposed-phase gradient-echo MR imaging.
His tales are filled with haunting astronomical images--a waning crescent moon casting its feeble light on moldering gravestones; frosty Aldebaran seeming to balance on a steeple over an ancient, worm-bedeviled Massachusetts seaport; Polaris, steeped in prehistoric secrets from its 26,000-year
precessional cycle, "winking hideously like an insane watching eye.
This value is in the range of the
precessional cycle of the Earth's orbit.
pcn] be the
precessional angular speed, and let [v.
So, it is important to build the wideband radar echo model of midcourse
precessional target.
From the perspective of the precessing magnetic moments, the biomagnetic field generated by neuronal activity also contributes to the applied magnetic field, thereby altering their
precessional frequencies.
The best studied is 56 Ari [10] whose magnetic axis has a
precessional period of 5 years.
THE OPTIMIZING OF THE TRANSMISSION SYSTEM BY USING
PRECESSIONAL TRANSMISSION [3]
The importance of
precessional signals in the tropical climate.
However, all orbital cycles, including the 19 000 to 23 000-year
precessional cycle, were operative regardless of which climatic conditions dominated and what soil developed (Rutter et al.
