Pu

Pu
Plutonium is a product of the radioactive decay of neptunium.
Pulley
A disc with a groove around its circumference to locate a rope or cable and is used to change the direction of a force and/or multiply the force.
Pulmonary Artery
The blood vessel that carries oxygen-poor blood from the right ventricle of the heart to the lungs.
Pulmonary Valve
The flaps in the heart between the right ventricle and the pulmonary artery.
Pulmonary Vein
The blood vessel that carries oxygen-rich blood from the lungs to the left atrium of the heart.
Pulsar
A stellar source, such as a rotating single star or pair of stars, emitting electromagnetic radiation which is characterised by rapid frequency and regularity.
Pulse
Signal characterized by a steep rise from and decay toward an initial level.
Pulse Amplitude Modulation
Pulse modulation in which the amplitude of the pulses is varied by the modulating signal.
Pulse Code Modulation
Coding where the input signal is represented by a given number of fixed-width samples per second.
Pulse Compression
Any technique for modifying or processing a pulse so that the autocorrelation function is greater than one.
Pulse Duration
The period of time during which a pulse is present.
Pulse Duration Modulation
Pulse modulation in which the time duration of the pulses is changed by the modulating signal.
Pulse Forming Network
An LC network that alternately stores and releases energy in an approximately rectangular wave.
Pulse Frequency Modulation
Pulse modulation in which the modulating voltage varies the repetition rate of a pulse train.
Pulse Modulated Field
An electromagnetic field produced by the amplitude modulation of a continuous wave carrier by one or more pulses.
Pulse Modulation
A form of modulation in which one of the characteristics of a pulse train is varied.
Pulse Oscillator
A sine-wave oscillator that is turned on and off at specific times.
Pulse Output Power
The ratio of the average output power to the pulse duty factor.
Pulse Position Modulation
Pulse modulation in which the position of the pulses is varied by the modulating voltage.
Pulse Range
Difference in decibels between the peak level of an impulsive signal and the root-mean-square level of a continuous noise.
Pulse Repitition Rate
The average number of pulses in unit time during a specified period.
Pulse Time Modulation
Pulse modulation that varies one of the time characteristics of a pulse train.
Pulse Width
Duration of time between the leading and trailing edges of a pulse.
Pulse Width Modulated Wave Inverter
A type of power inverter that produces a nearly sinusoidal voltage, at minimum current harmonics.
Pulse Width Modulation
Pulse modulation in which the duration of the pulses is varied by the modulating voltage.
Pultrusion
A continuous process for manufacturing composites in rods, tubes, and structural shapes having a constant cross-section.
Pulverizer
A device used to reduce a substance to a powder form usually by grinding.
Pumice
A light porous stone of mixed silicates.

Pump
Electrical source of the energy required to vary the capacitance of a parametric amplifier.
Pump Down
The act of using a compressor or a pump to reduce the pressure in a container or a system.
Punch
A tool for forcing a bolt, pin, or rivet in or out of a hole.
Pure Air
An old name for oxygen
Pure Error
Variability between observations made at the same values of the independent variable or variables.
Pure Procedure Code
Program code that does not modify itself as it runs.
Pure Substance
A form of matter that has both definite composition and distinct properties.
Pure Tone
A tone with a sinusoidal waveform.
Push Pull Amplifier
An amplifier that uses two transistors whose output signals are in phase opposition.
Pusher Seal
A mechanical seal in which the secondary seal is pushed along the shaft or sleeve to compensate for misalignment and face wear.
Pushrod
A metal rod that transmits the motion of the camshaft to the valve actuators
Putrescine

C4H12N2

Related to cadaverine and produced by the breakdown of amino acids in living and dead organisms.