“source”的概念、定义、翻译、参考文献-科学参考

source

Physics

The electrode in a field-effect transistor from which electrons or holes enter the interelectrode space.

Mathematics

A point source is a type of singularity in fluid mechanics. In a planar flow a point source at the origin may be modelled, using polar coordinates, with flow velocity

$u = \frac{Q}{2 π r} e_{r}$

where Q > 0 and e_r = (cosθ‎, sinθ‎) is the unit radial vector. Q is then the flux across any simple closed curve around the origin. The complex potential is

$w = \frac{Q}{2 π} log z .$

Note this is a multifunction (a consequence of the flow not being irrotational). When Q < 0, the above singularity is a sink. For diagrams of a source and sink, see singularity (fluid dynamics).
The vertex in a network away from which all flows are directed.

Statistics

See network flow problems.

Electronics and Electrical Engineering

1. The point in a vector field at which lines of flux originate; an example is a positive electric charge in an electrostatic field. A point at which lines of flux terminate is a sink.
2. Any device that produces electrical energy, e.g. a current source.
3. The electrode in a field-effect transistor that supplies charge carriers (holes or electrons) to the interelectrode space.

单词	source
释义	source Physics The electrode in a field-effect transistor from which electrons or holes enter the interelectrode space. Mathematics A point source is a type of singularity in fluid mechanics. In a planar flow a point source at the origin may be modelled, using polar coordinates, with flow velocity $u = \frac{Q}{2 π r} e_{r}$ where Q > 0 and e_r = (cosθ‎, sinθ‎) is the unit radial vector. Q is then the flux across any simple closed curve around the origin. The complex potential is $w = \frac{Q}{2 π} log z .$ Note this is a multifunction (a consequence of the flow not being irrotational). When Q < 0, the above singularity is a sink. For diagrams of a source and sink, see singularity (fluid dynamics). The vertex in a network away from which all flows are directed. Statistics See network flow problems. Electronics and Electrical Engineering 1. The point in a vector field at which lines of flux originate; an example is a positive electric charge in an electrostatic field. A point at which lines of flux terminate is a sink. 2. Any device that produces electrical energy, e.g. a current source. 3. The electrode in a field-effect transistor that supplies charge carriers (holes or electrons) to the interelectrode space.
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