“domain”的概念、定义、翻译、参考文献-科学参考

domain

Physics

See magnetism.

Mathematics

See function.

Science and Technology

1. In computing, an identification string that defines an administrative area in the internet. It consists of sections separated by full points (dots).
2. In taxonomy, the highest category, based on comparisons of ribosomal RNA; there are three domains: Bacteria, Archaea, and Eukarya.
Mike Allaby

Chemistry

A functional unit of the tertiary structure of a protein that can function and evolve independently of the rest of the protein. It consists of chains of amino acids folded into alpha helices and beta sheets to form a globular structure. Different domains are linked together by relatively straight sections of polypeptide chain to form the protein molecule. Domains allow a degree of movement in the protein structure.

Computer

1. In general, a sphere of control, influence, or concern.
2. See category, function, relation. See also range.
3. (of a network) Part of a larger network. A domain is usually defined in terms of some property, such as that part of the network that is under the jurisdiction of a single management body (a management domain), or where all the network addresses are assigned by a single controlling authority (a naming domain). On the Internet, it often refers to the so-called top-level domain, which is the last part of the address. This may indicate the type of site; for example, .com for a commercial organization, .gov for a US government agency, .ac for an academic institution. It may also show the country; for example, .uk for United Kingdom, .fr for France, etc. See also domain name server.
4. In the relational model, a set of possible values from which the actual values in any column of a table (relation) must be drawn.
5. In denotational semantics, a structured set of mathematical entities in which meanings for programming constructs can be found. The idea first arose in the work of Dana Scott, who with Christopher Strachey pioneered this mathematical approach to programming language semantics. The approach focuses on fixed-point theorems. Scott required domains to be complete lattices, but this has been simplified through a great deal of mathematical research. There are now many kinds of domains, but a commonly used one is the Scott–Ershov domain, which is a consistently complete algebraic cpo (complete partial ordering). For such mathematical structures a fine theory of constructing new domains from old and solving fixed-point equations has been developed. The domain theory has many applications in finding semantics for programming and specification languages, and approximating data types. Mathematically the theory is closely linked to topology and algebra.
6. See protection domain.

Internet

A collection of computational entities and networks.

Electronics and Electrical Engineering

1. See ferromagnetism.
2. See Gunn effect.
3. See time domain; frequency domain.

Biology

1. (in biochemistry) A functional unit of the tertiary structure of a protein. It consists of chains of amino acids folded into alpha helices and beta sheets to form a globular structure. Different domains are linked together by relatively straight sections of polypeptide chain to form the protein molecule. Domains allow a degree of movement in the protein structure. See also finger domain.
2. (in taxonomy) The highest taxonomic category, consisting of one or more kingdoms. Living organisms are divided into three domains: Archaea, Bacteria, and Eukarya (eukaryotic organisms).

Geology and Earth Sciences

The primary taxonomic division of living systems. There are three domains: Archaea, Bacteria, and Eukarya.

Philosophy

The domain of a quantifier is the set of things that serve as possible values for its variable. The domain of a relation is the set of things that bear the relation to something else.

单词	domain
释义	domain Physics See magnetism. Mathematics See function. Science and Technology 1. In computing, an identification string that defines an administrative area in the internet. It consists of sections separated by full points (dots). 2. In taxonomy, the highest category, based on comparisons of ribosomal RNA; there are three domains: Bacteria, Archaea, and Eukarya. Mike Allaby Chemistry A functional unit of the tertiary structure of a protein that can function and evolve independently of the rest of the protein. It consists of chains of amino acids folded into alpha helices and beta sheets to form a globular structure. Different domains are linked together by relatively straight sections of polypeptide chain to form the protein molecule. Domains allow a degree of movement in the protein structure. Computer 1. In general, a sphere of control, influence, or concern. 2. See category, function, relation. See also range. 3. (of a network) Part of a larger network. A domain is usually defined in terms of some property, such as that part of the network that is under the jurisdiction of a single management body (a management domain), or where all the network addresses are assigned by a single controlling authority (a naming domain). On the Internet, it often refers to the so-called top-level domain, which is the last part of the address. This may indicate the type of site; for example, .com for a commercial organization, .gov for a US government agency, .ac for an academic institution. It may also show the country; for example, .uk for United Kingdom, .fr for France, etc. See also domain name server. 4. In the relational model, a set of possible values from which the actual values in any column of a table (relation) must be drawn. 5. In denotational semantics, a structured set of mathematical entities in which meanings for programming constructs can be found. The idea first arose in the work of Dana Scott, who with Christopher Strachey pioneered this mathematical approach to programming language semantics. The approach focuses on fixed-point theorems. Scott required domains to be complete lattices, but this has been simplified through a great deal of mathematical research. There are now many kinds of domains, but a commonly used one is the Scott–Ershov domain, which is a consistently complete algebraic cpo (complete partial ordering). For such mathematical structures a fine theory of constructing new domains from old and solving fixed-point equations has been developed. The domain theory has many applications in finding semantics for programming and specification languages, and approximating data types. Mathematically the theory is closely linked to topology and algebra. 6. See protection domain. Internet A collection of computational entities and networks. Electronics and Electrical Engineering 1. See ferromagnetism. 2. See Gunn effect. 3. See time domain; frequency domain. Biology 1. (in biochemistry) A functional unit of the tertiary structure of a protein. It consists of chains of amino acids folded into alpha helices and beta sheets to form a globular structure. Different domains are linked together by relatively straight sections of polypeptide chain to form the protein molecule. Domains allow a degree of movement in the protein structure. See also finger domain. 2. (in taxonomy) The highest taxonomic category, consisting of one or more kingdoms. Living organisms are divided into three domains: Archaea, Bacteria, and Eukarya (eukaryotic organisms). Geology and Earth Sciences The primary taxonomic division of living systems. There are three domains: Archaea, Bacteria, and Eukarya. Philosophy The domain of a quantifier is the set of things that serve as possible values for its variable. The domain of a relation is the set of things that bear the relation to something else.
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