“ripple”的概念、定义、翻译、参考文献-科学参考

ripple

Physics

1. A surface wave on a liquid having so short a wavelength that the motion of the wave is dominated by surface tension, i.e. the wavelength must be less than 2π‎(γ‎/ρ‎g)^½, where γ‎ is the surface tension and ρ‎ the density of the liquid and g is the acceleration of free fall. In the case of water, the wavelength must be less than 1.7 cm. Patterns made in mud or sand by currents in the water that flows over them are called ripple marks.

2. (in electricity) The alternating-current component of a direct-current power supply resulting from sources within the power supply.

Electronics and Electrical Engineering

1. An alternating-current component superimposed on a direct-current component resulting in variations in the instantaneous value of a unidirectional current or voltage. The term is particularly applied to the output of a rectifier. The frequency of the a.c. component is the ripple frequency; for a full-wave rectifier it is twice the frequency of the input signal.
The magnitude of the ripple is given by the ratio of the root-mean-square value of the a.c. component to the mean value of the total and is usually expressed as a percentage. This is known as the ripple factor. Some form of smoothing circuit or regulator is normally used in order to reduce the amount of ripple present on the output of a rectifier, generator, etc.
2. See pulse.

Geology and Earth Sciences

Small-scale ridge of sand produced by flowing water, wind motion, or wave action. The wavelength or spacing of ripple crests is usually less than 50 cm and the heights are less than 20 cm. Ripple form can be described by the wavelength to height ratio, referred to as the ripple index. The migration of ripples leads to the formation of cross-lamination in sands. See also dune bedform.

单词	ripple
释义	ripple Physics 1. A surface wave on a liquid having so short a wavelength that the motion of the wave is dominated by surface tension, i.e. the wavelength must be less than 2π‎(γ‎/ρ‎g)^½, where γ‎ is the surface tension and ρ‎ the density of the liquid and g is the acceleration of free fall. In the case of water, the wavelength must be less than 1.7 cm. Patterns made in mud or sand by currents in the water that flows over them are called ripple marks. 2. (in electricity) The alternating-current component of a direct-current power supply resulting from sources within the power supply. Electronics and Electrical Engineering 1. An alternating-current component superimposed on a direct-current component resulting in variations in the instantaneous value of a unidirectional current or voltage. The term is particularly applied to the output of a rectifier. The frequency of the a.c. component is the ripple frequency; for a full-wave rectifier it is twice the frequency of the input signal. The magnitude of the ripple is given by the ratio of the root-mean-square value of the a.c. component to the mean value of the total and is usually expressed as a percentage. This is known as the ripple factor. Some form of smoothing circuit or regulator is normally used in order to reduce the amount of ripple present on the output of a rectifier, generator, etc. 2. See pulse. Geology and Earth Sciences Small-scale ridge of sand produced by flowing water, wind motion, or wave action. The wavelength or spacing of ripple crests is usually less than 50 cm and the heights are less than 20 cm. Ripple form can be described by the wavelength to height ratio, referred to as the ripple index. The migration of ripples leads to the formation of cross-lamination in sands. See also dune bedform.
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