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absolute encoder

absolute encoder   Quick reference

A Dictionary of Mechanical Engineering

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Engineering and Technology
Length:
83 words
Illustration(s):
1
A device which provides a continuous digital output representing angle or position. The output is normally obtained from a number of photocells mounted along a radial line and detecting ... More
absolute encoder

absolute encoder   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Engineering and Technology
Length:
84 words
Illustration(s):
1
A device which provides a continuous digital output representing angle or position. The output is normally obtained from a number of photocells mounted along a radial line and detecting ... More
absorption coefficient

absorption coefficient   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
103 words
Illustration(s):
1

For a travelling wave in a lossy medium, the fraction of the power lost per incremental length, given in differential form by...

acceleration

acceleration   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Engineering and Technology
Length:
108 words
Illustration(s):
1

The rate of change of speed or velocity with respect to time. If the acceleration is constant then the final velocity, ...

Ackerman linkage

Ackerman linkage   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Engineering and Technology
Length:
50 words
Illustration(s):
1

A steering linkage on a motor vehicle that approximately gives rolling without slipping of both wheels about the turning point. This is achieved by having the inner ...

Ackerman linkage

Ackerman linkage   Quick reference

A Dictionary of Mechanical Engineering

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Engineering and Technology
Length:
50 words
Illustration(s):
1

A steering linkage on a motor vehicle that approximately gives rolling without slipping of both wheels about the turning point. This is achieved by having the inner ...

acoustic wave

acoustic wave   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
406 words
Illustration(s):
2
A longitudinal wave that is transmitted through a solid, liquid, or gaseous material as a result of the mechanical vibrations of the particles forming the material. The direction of motion ... More
activation energy

activation energy   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Engineering and Technology
Length:
90 words
Illustration(s):
1

The minimum energy required to activate one mole of a substance to cause a *chemical reaction to take place. For a chemical reaction to proceed, ...

active earth pressure

active earth pressure   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Engineering and Technology
Length:
86 words
Illustration(s):
1

The horizontal pressure that is exerted on a retaining wall by the mass of soil it retains. Active pressure develops

adaptive control system

adaptive control system   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
80 words
Illustration(s):
1
A *control system in which the controller has adjustable *parameters and a mechanism for adjusting the parameters. The controller becomes nonlinear because of the parameter adjustment ... More
admittance

admittance (symbol: Y; unit: siemens)   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
88 words
Illustration(s):
3

The reciprocal of *impedance. It is a complex quantity given by

Y=G+jB

where G...

aeration number

aeration number   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Engineering and Technology
Length:
36 words
Illustration(s):
1

A dimensionless number, Na, used in the aeration-mixing of bioreactors and relates the gas flow rate, G, to the impeller speed, ...

aerofoil

aerofoil   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Engineering and Technology
Length:
188 words
Illustration(s):
1

A thin structure, the shape of which gives rise to lower pressures on one surface (suction surface) compared with the other (...

aerofoil

aerofoil   Quick reference

A Dictionary of Mechanical Engineering

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Engineering and Technology
Length:
185 words
Illustration(s):
1

A structure, the shape of which gives rise to lower pressures on one side (suction surface) compared with the other (...

afterburner

afterburner   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Engineering and Technology
Length:
34 words
Illustration(s):
1
An extension of the exhaust of a turbofan or turbojet engine into which additional fuel is injected and burned to provide increased thrust. Primarily used on supersonic military aircraft. ... More
afterburner

afterburner   Quick reference

A Dictionary of Mechanical Engineering

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Engineering and Technology
Length:
34 words
Illustration(s):
1
An extension of the exhaust of a turbofan or turbojet engine into which additional fuel is injected and burned to provide increased thrust. Primarily used on supersonic military aircraft. ... More
air bridge

air bridge   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
197 words
Illustration(s):
1
A method of forming interconnections or *crossovers in MMICs (*monolithic microwave integrated circuits). The bridge consists of a layer of plated metal with no material other than air ... More
alternating current

alternating current   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
101 words
Illustration(s):
1
An electric current whose direction in the circuit is periodically reversed with a *frequency, f, independent of the circuit constants. In the simplest form the instantaneous current ... More
Amagat’s law

Amagat’s law   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Engineering and Technology
Length:
53 words
Illustration(s):
1

A law that states that for an ideal gas, the total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes: ...

AM detector

AM detector   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
73 words
Illustration(s):
1

An older term for the earlier type of *amplitude demodulator. The simplest form is known as a *diode detector...

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