“saturation”的概念、定义、翻译、参考文献-科学参考

saturation

Physics

1. See colour.

2. See supersaturation.

Chemistry

See supersaturation.

Computer

1. A psycho-physiological measurement of the degree to which a colour appears to be free of white.
2. (of a transistor) See bipolar transistor.
3. (of an amplifier) A state in which the signal level exceeds the dynamic range.

Electronics and Electrical Engineering

1. A condition where the output current of an electronic device is substantially constant and independent of voltage. In the case of a device such as a field-effect transistor or thermionic valve, saturation is an inherent function of the device and produces the maximum current inherent to the device. In the case of a bipolar junction transistor, saturation occurs when both junctions are forward biased. The collector current is limited by the circuit elements of the external circuit and changing these alters the magnitude of the saturation current drawn from the device.
2. (magnetic) The maximum possible degree of magnetization of a material; it is independent of the strength of the magnetic flux density applied to the material. All the domains in the material at saturation are assumed to be fully orientated with respect to the magnetic flux density (see ferromagnetism).

Geology and Earth Sciences

In remote sensing:

1. the maximum digital number value which can be assigned to a pixel;
2. a point between the achromatic line and a pure hue of a pixel colour corresponding to the relative mixture of hues going to make up a colour.

Geography

There is a constant exchange of water molecules between liquid water, or ice, and the air, as evaporation and condensation take place. Saturation vapour pressure (es) depicts a balance in the air between condensation and evaporation. es is greater in water droplets than in sheet water, and lower in impure water than in pure. Where es in an air parcel is greater than e (the ambient vapour pressure) there will be net evaporation; where e is greater than es, there will be net condensation.

单词	saturation
释义	saturation Physics 1. See colour. 2. See supersaturation. Chemistry See supersaturation. Computer 1. A psycho-physiological measurement of the degree to which a colour appears to be free of white. 2. (of a transistor) See bipolar transistor. 3. (of an amplifier) A state in which the signal level exceeds the dynamic range. Electronics and Electrical Engineering 1. A condition where the output current of an electronic device is substantially constant and independent of voltage. In the case of a device such as a field-effect transistor or thermionic valve, saturation is an inherent function of the device and produces the maximum current inherent to the device. In the case of a bipolar junction transistor, saturation occurs when both junctions are forward biased. The collector current is limited by the circuit elements of the external circuit and changing these alters the magnitude of the saturation current drawn from the device. 2. (magnetic) The maximum possible degree of magnetization of a material; it is independent of the strength of the magnetic flux density applied to the material. All the domains in the material at saturation are assumed to be fully orientated with respect to the magnetic flux density (see ferromagnetism). Geology and Earth Sciences In remote sensing: 1. the maximum digital number value which can be assigned to a pixel; 2. a point between the achromatic line and a pure hue of a pixel colour corresponding to the relative mixture of hues going to make up a colour. Geography There is a constant exchange of water molecules between liquid water, or ice, and the air, as evaporation and condensation take place. Saturation vapour pressure (es) depicts a balance in the air between condensation and evaporation. es is greater in water droplets than in sheet water, and lower in impure water than in pure. Where es in an air parcel is greater than e (the ambient vapour pressure) there will be net evaporation; where e is greater than es, there will be net condensation.
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