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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:
82 words
Illustration(s):
1

A device which provides a continuous digital output representing angle or position. The output is normally obtained from a number

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

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.

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:
77 words
Illustration(s):
1

A *control system in which the controller has adjustable *parameters and a mechanism for adjusting the parameters. The

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

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

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

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

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:
184 words
Illustration(s):
1

A method of forming interconnections or *crossovers in MMICs (*monolithic microwave integrated circuits). The bridge consists

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:
67 words
Illustration(s):
1

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

amount of substance

amount of substance   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Engineering and Technology
Length:
97 words
Illustration(s):
1
A measure of the number of entities present in a substance, such as atoms, molecules, ions, and electrons, etc., expressed in moles. For example, the amount of an element is proportional ... More
Ampere’s law

Ampere’s law   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:
299 words
Illustration(s):
1

1. (Ampere–Laplace law) The force between two parallel current-carrying conductors in free space is given by

dF

amplitude modulation

amplitude modulation   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:
673 words
Illustration(s):
2

A type of *modulation in which the amplitude of the *carrier wave is varied above and below its

analogue-to-digital converter

analogue-to-digital converter   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:
173 words
Illustration(s):
1

A device/circuit/IC that converts a continuous *analogue signal into a discrete *binary signal. There are many forms

Anderson bridge

Anderson 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:
69 words
Illustration(s):
1

A *bridge, modified from the *Maxwell bridge, in which an inductance, L, is compared with

Andrussov process

Andrussov process   Quick reference

A Dictionary of Chemical Engineering

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

A catalytic process used for the production of hydrogen cyanide by the reaction of ammonia, methane, and air at a temperature of around 1,000°C using a platinum catalyst:...

angle of friction

angle of friction   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:
36 words
Illustration(s):
1

Ratio between the shear stress and normal stress at failure, originally proposed by Coulomb in 1773:

angular velocity

angular velocity   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Engineering and Technology
Length:
39 words
Illustration(s):
1
The rate of change of angular displacement with time: ω=dθdt The rotational speed of shafts for mixers, centrifugal separators, and centrifugal pump impellers are sometimes ... More

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