- 行业: Weather
- Number of terms: 60695
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
Analysis and prediction using traditional methods such as the local establishment. See lunitidal interval.
Industry:Weather
Any form of analysis by infrared absorption that does not rely on a monochromator to separate the wavelengths of the radiation. If the target molecule is the only one known to absorb strongly in the wavelength region of interest, a broadband optical filter may be used, such as in instruments to measure ambient carbon dioxide. If the target molecule absorbs less strongly, or if the spectral region is congested, more specific techniques such as gas filter correlation spectroscopy must be used.
Industry:Weather
Parameter of a problem with a value that is independent of the units of measurement. See nondimensional equation, dimensional analysis.
Industry:Weather
An equation that is independent of the units of measurement as it only involves nondimensional numbers, parameters, and variables. This is usually the result of dimensional analysis.
Industry:Weather
A number with a value that is independent of the units of measurement. Dimensionless numbers often arise from dimensional analysis and include common quantities such as the Reynolds number, Rossby number, Rayleigh number, Richardson number, etc. See dimensionless group.
Industry:Weather
Unpredictable in terms of observable antecedents and known laws. This is a relative term pertaining to a given state of knowledge but not necessarily implying ultimate unpredictability. Compare deterministic, random.
Industry:Weather
The power level of a signal below which noise is likely to obscure the signal and above which the signal is discernible.
Industry:Weather
The graphical representation of an equation of three variables ''f''(''u, v, w'') = 0, by means of three graphical scales (not necessarily straight), arranged in such a manner that any straight line, called an index line, cuts the scales in values of ''u'', ''v'', and ''w'' satisfying the equation. By introducing auxiliary variables and constructing auxiliary scales, equations containing more than three variables may also be represented by nomograms.
Industry:Weather
A measure of the noise power of a device or circuit. The noise temperature is the temperature of a resistor that has noise power equal to that of the device or circuit. Specifically, the noise temperature is defined by ''T'' = ''N/kB'', where ''N'' is the noise power within bandwidth ''B'', and ''k'' = 1. 38 × 10<sup>−23</sup>J K<sup>−1</sup> is Boltzmann's constant. A radar system is characterized by several noise temperatures: the antenna temperature ''T<sub>a, </sub>'' the receiver temperature ''T<sub>r, </sub>'' and the transmission line temperature ''T<sub>l. </sub>'' The transmission line temperature is a measure of the noise power within the receiver bandwidth generated by the resistive losses in the transmission line or waveguide between the antenna and the receiver. The transmission line temperature is frequently combined with either the antenna or the receiver temperature, depending on the reference point for the measurement. The total system temperature is ''T'' = ''T<sub>a</sub>'' + ''T<sub>l</sub>'' + ''T<sub>r</sub>''.
Industry:Weather
