The G " feature is associated with vibrations of carbon atoms along the circumferential direction.
2.
These are the axial direction ( along the grain ), the radial direction, and the circumferential direction.
3.
Mechanical properties, such as strength and stiffness, measured axially ( along the grain ) are typically better than those measured in the radial and circumferential directions ( across the grain ).
4.
A typical magnetic region on a hard-disk platter ( as of 2006 ) is about 200 250 nanometers wide ( in the radial direction of the platter ) and extends about 25 30 nanometers in the down-track direction ( the circumferential direction on the platter ), corresponding to about 100 billion bits per square inch of disk area ( 15.5 Gbit / cm 2 ).
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