High-contrast films reproduce tone differences in the subject as great density differences in the image; low-contrast films translate tone differences into small density differences.
Since it is only Fermi-surface electrons that carry current, a vanishingly small density of such electronic states leads to low electrical conductivities in semiconductors and insulators.
Now in widespread use, CT scans produce detailed high-resolution cross-sectional images of internal organs and structures; they are far more sensitive to small density variations than conventional X-ray images.
In the first place it is found, as for waves on shallow water and for very much the same reasons, that, where two small density steps are moving parallel to one another, the second is bound to catch up with the first.
To this end a method was developed for the detection of small density differences among macromolecules.
At low current density of -0.1 ma/cm2, a very small density of nanorods was obtained.
Moreover, the proposed method can clearly distinguish between polymers with small density differences (<0.03 g/cm3).
Such expansion would stretch space and smooth matter, while leaving small density variations that show up in the CMB.
The two fluids have a small density difference and a nearly-identical viscosity.
At this point, heat loss has an obvious influence on temperature drop of SCW with a small density.
And if small density foam has a high flow resistance, a superior sound insulation can still be maintained.
