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N GALAXY

A type of active galaxy with an extremely bright compact nucleus; may be a powerful radio source. The luminosity is between that of a quasar and a Seyfert galaxy See panels on Galaxy and Quasar.

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N-DISPLAY

A radar K-display in which the target pro

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N-METHYL-D-ASPARTIC ACID

An agonist for a class of glutamate receptor NMDA-receptor found on some vertebrate nerve cells. Abbrev NMDA.

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N-N HETEROJUNCTION

A junction in a heterostructure formed between a narrower band gap material n-type and a wider gap material N-type.

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N-SHELL

The electron shell in an atom corresponding to a principal quantum number of four. The shell contains up to 32 electrons and is the last shell to be filled completely by electrons in the naturally occuring elements. See panel on Atomic structure,

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N-TERMINAL PAIR NETWORK

One having N terminal pairs in which one terminal of each pair may coincide with a node.

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N-TYPE CONDUCTION

Conductivity associated with charge transport by electrons. Also n-type conductivity.

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N-TYPE SEMICONDUCTOR

A relatively wide band gap n-type semiconductor,

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NACELLE

A small streamlined body on an aircraft, distinct from the fuselage, housing engines, special equipment or crew,

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NACRE

The iridescent calcareous substance, mostly calcium carbonate, composing the inner layer of a molluscan shell and formed by mantle cells. Mother of pearl. Also nacreous layer.

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