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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:
200 words
Illustration(s):
3

Physical damage to the abdomen and its contents. The abdomen is particularly vulnerable to blows during contact and collision sports.

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

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 (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
215 words
Illustration(s):
1

1. (in optics) A defect in the image formed by a lens or curved mirror. In chromatic aberration the image

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:
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

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:
43 words
Illustration(s):
1

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

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:...

Accentors

Accentors   Reference library

The New Encyclopedia of Birds

Reference type:
Subject Reference
Subject:
Science and technology, Life Sciences
Length:
1,093 words
Illustration(s):
2

Accentors do not have spectacular plumage, they behave unobtrusively, and most species live at high altitude and are poorly known.

acceptance–rejection algorithm

acceptance–rejection algorithm   Quick reference

A Dictionary of Statistics (3 ed.)

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

A method for generating values of a *continuous random variable for use in a *simulation. Suppose that the random variable ...

access vector

access vector   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:
90 words
Illustration(s):
1

A vector that is used in the representation of a *ragged array. For example, the elements of a

accommodation

accommodation   Reference library

The Oxford Companion to the Body

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Life Sciences
Length:
800 words
Illustration(s):
1

Optical instruments (such as microscopes, cameras, and some telescopes) work by passing light through the curved surfaces of lenses, where

accretionary wedge

accretionary wedge   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Earth Sciences and Geography
Length:
76 words
Illustration(s):
1

A tectonically thickened wedge of *sediment found on the landward side of some *trenches. The accretionary wedge consists of oceanic sediment scraped off the subducting ...

acenaphthene

acenaphthene   Quick reference

A Dictionary of Chemistry (7 ed.)

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

A colourless crystalline aromatic compound, C12H10; m.p. 95°C; b.p. 278°C. It is an intermediate in the production of some dyes....

acetals

acetals   Quick reference

A Dictionary of Chemistry (7 ed.)

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

Organic compounds formed by addition of alcohol molecules to aldehyde molecules. If one molecule of aldehyde (RCHO) reacts with one molecule of alcohol (R...

acetylcholine

acetylcholine   Quick reference

A Dictionary of Genetics (8 ed.)

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

a biogenic amine that plays an important role in the transmission of nerve impulses across synapses and from nerve endings

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