To separate or isolate a conducting body from its surroundings, by means of a nonconductor, as to prevent transfer of electricity, heat, or sound.
Related Terms 
POPOV'S STABILITY CRITERION
A frequency domain stability test for systems consisting of a linear component described by a transfer function preceded by a nonlinear component characterized by an inputoutput function), with a unity gain feedback loop surrounding the series connection.

POLEZERO CONFIGURATION
A plot of the poles and zeros of a transfer function in the complex plane; used to study the stability of a system, its natural motion, its frequency response, and its transient response.

PLATEN
1.A flat plate against which something rests or is pressed. 2. The rubbercovered roller of a typewriter against which paper is pressed when struck by the typebars. 2. A flat surface for exchanging heat in a boiler or heat exchanger which may have extended heat transfer surfaces.

PASSIVE SOLAR SYSTEM
A solar heating or cooling system that operates by using gravity, heat flows, or evaporation rather than mechanical devices to collect and transfer energy.

NYQUIST DIAGRAM
A plot in the complex plane of the openloop transfer function as the complex frequency is varied along the Nyquist contour; used to determine stability of a control system.

NUSSELT NUMBER
A dimensionless number used in the study of forced convection which gives a measure of the ratio of the total heat transfer to conductive heat transfer, and is equal to the heattransfer coefficient times a characteristic length divided by the thermal conductivity. Symbolized NNu.

NONMINIMUMPHASE SYSTEM
A linear system whose transfer function has one or more poles or zeros with positive, nonzero real parts.

NONINTERACTING CONTROL
A feedback control in a system with more than one input and more than one output, in which feedback transfer functions are selected so that each input noncontact sensor See proximity sensor.

MOLECULAR HEAT DIFFUSION
Transfer of heat through the motion of molecules.

MINIMUMPHASE SYSTEM
A linear system for which the poles and zeros of the transfer function all have negative or zero real parts.
