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A/D converter

A/D converter   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Mathematics and Computer Science
Length:
208 words
Illustration(s):
2

A device that can accept an analogue, i.e. continuous, signal whose amplitude lies within a given range, and produce an equivalent digital signal, i.e. an ...

Aalen model

Aalen model   Quick reference

A Dictionary of Statistics (3 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Mathematics and Computer Science
Length:
56 words
Illustration(s):
1

A *linear regression model describing the manner in which the *expected value of a response variable, Z(...

Aardvark

Aardvark   Reference library

The Encyclopedia of Mammals (3 ed.)

Reference type:
Subject Reference
Current Version:
2007
Subject:
Science and technology, Life Sciences
Length:
1,361 words
Illustration(s):
3

Few people have had the fortune of a close encounter with the aardvark, one of Africa's most bizarre and specialized

abdominal injury

abdominal injury   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007
Subject:
Science and technology, Medicine and health
Length:
201 words
Illustration(s):
3
Physical damage to the abdomen and its contents. The abdomen is particularly vulnerable to blows during contact and collision sports. Most blows to the abdomen result in nothing more ... More
abduction

abduction   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007
Subject:
Science and technology, Medicine and health
Length:
35 words
Illustration(s):
1

Movement of a body segment (e.g. arm or leg) away from the midline of the body. The term also refers to the movement of fingers or toes when they are spread apart. ...

abductor muscle

abductor muscle   Quick reference

A Dictionary of Zoology (4 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
26 words
Illustration(s):
1

A muscle that draws a structure (e.g. a limb) away from the centre line of the body. Compare adductor muscle

aberration

aberration   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
218 words
Illustration(s):
1
1. (in optics) A defect in the image formed by a lens or curved mirror. In chromatic aberration the image formed by a lens (but not a mirror) has coloured fringes as a result ... More
aberration of starlight

aberration of starlight   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Astronomy and Cosmology
Length:
152 words
Illustration(s):
1
The small apparent difference between the observed direction of a star and its true direction (see diagram). It is due to the combined effect of the observer’s motion across the path of ... More
abscisic acid

abscisic acid   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
34 words
Illustration(s):
1

a plant hormone synthesized by chloroplasts. High levels of abscisic acid result in the abscission of leaves, flowers, and fruits.

absolute configuration

absolute configuration   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
573 words
Illustration(s):
1

A way of denoting the absolute structure of an optical isomer (see optical activity). Two conventions are in use: The ...

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
absolute value

absolute value   Quick reference

The Concise Oxford Dictionary of Mathematics (5 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Mathematics and Computer Science
Length:
41 words
Illustration(s):
1

For any real number the absolute value (also called the *modulus) of denoted by is itself if and ...

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...

absorption laws

absorption laws   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Mathematics and Computer Science
Length:
48 words
Illustration(s):
1

The two self-dual lawsx∨(x∧y)=xx∧(x∨y)...

abstract data type

abstract data type   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Mathematics and Computer Science
Length:
257 words
Illustration(s):
3

A *data type that is defined solely in terms of the operations that apply to objects of the type without commitment as to how the value of such an object is to be represented (...

abstraction

abstraction   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
42 words
Illustration(s):
1

A chemical reaction that involves bimolecular removal of an atom or ion from a molecule. An example is the abstraction of hydrogen from methane by reaction with a radical:...

abstract reduction system

abstract reduction system   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Mathematics and Computer Science
Length:
362 words
Illustration(s):
2

A general characterization of the process of deriving or transforming data by means of rules. It is an abstraction based primarily on examples of ...

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, ...

acceleration

acceleration   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
107 words
Illustration(s):
1

Symbol a. The rate of increase of speed or velocity. It is measured in m s−2. For a body moving linearly with constant acceleration ...

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