N
NAND gate (NOT-AND gate) A logic gate which gives a logic-0 output when, and only when, all the input signals are at logic 1. It may be regarded as an AND gate followed by a NOT or logic negating stage as suggested by the graphical symbol shown in Figure N.1. See logic level.
Figure N.1 Graphical symbol for a NAND gate
natural air cooling Same as convection cooling.
natural frequency Of an oscillatory system, the frequency of free oscillations. Thus it is the frequency at which the system oscillates when shock-excited. A system can have more than one natural frequency and the natural frequency of an antenna is the lowest frequency at which ...
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