Electric about charged nonconducting

We begin by writing the solution for the electric field about a nonconducting sphere, remembering that this field will simply be added to that produced by the charge separation in the double layer. With E = the applied electric field satisfies the Laplace equation (7.2.4) subject to the boundary conditions (j) = -E r cos 9 as r—>< , and that the normal component of the current density vanishes at the surface, whence S[Pg.200]

It seems there is no problem in modern physics for which there are on record as many false starts, and as many theories which overlook some essential feature, as in the problem of the thermal conductivity of nonconducting crystals (Peierls, 1961). This statement by R. Peierls goes back to almost 50 years ago, yet it appears to be still valid. Compared with charge flow (electric current), much less is known about the heat flow. 

Sample preparation for purposes of examination in the SEM is very simple. In order to avoid disruptive charges, electrically nonconductive ceramic materials must be coated with a film of gold, carbon, or platinum about 20 nm thick by a sputtering process. Etched and unetched sections, fracture surfaces, glazes, firing skins, powder compacts, and prefired and finished sintered products can then be examined directly in the scanning electron microscope. 

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