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It moves away from the centre (2 — * 3, 6 — > 8) and may either be trapped by an
imperfection of the lattice (8) or return to an ionized centre (activator), in which it
first occupies an excited level (3 — » 4) and then drops to the ground state of the
Note that there are planes of atoms halfway between cube faces in A and C but
not in B. Similarly there are (110) planes in A halfway between those in B and C,
and in C there is a (111) plane containing the atom at the cube's centre halfway ...
Centre of gravity. Figure 2B shows a plate of weight W resting on horizontal
supports at A and B. If the reactions RA and RB were required, the summation of
vertical forces Fv would yield only 2Fy = RA + RB- fV=0; to find RA and RB it
would be ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review