“standing wave”的概念、定义、翻译、参考文献-科学参考

standing wave

Physics

See stationary wave.

Electronics and Electrical Engineering

A wave that remains stationary, i.e. the displacement at any given point is always the same and a given displacement, such as that of a node, is not propagated along the wave. Standing waves result from the superimposition of two or more waves of the same period and usually occur when a wave is reflected totally or partially from a given barrier. Compare travelling wave.
In distributed circuits any mismatch of impedances will cause reflections of the voltage or current waves at the mismatch. The superposition of the incident and reflected voltage or current waves will result in a standing wave. If the amplitudes of the incident and reflected waves are the same then the standing wave will have a maximum amplitude of twice the amplitude of the individual waves; it will also possess nulls – points of zero amplitude – where the two waves exactly cancel. These points are located at every half wavelength of the original waves. In general, the incident and reflected waves will have different amplitudes, as some of the incident energy will be absorbed at the mismatched impedance. In this case the amplitude of the standing wave will be less than the maximum value, and the minimum will be nonzero, as the waves will no longer cancel exactly. In this situation the standing-wave ratio is defined as the ratio of maximum to minimum values of the standing wave voltage or current, and it is a measure of the impedance mismatch. The voltage standing-wave ratio (VSWR) is equal to
$\frac{(1 + Γ)}{(1 - Γ)}$
where Γ is the reflection coefficient of reflected to incident wave amplitudes due to the impedance mismatch.

Geology and Earth Sciences

Type of wave in which the surface oscillates vertically between fixed points called ‘nodes’, without any forward progression. The crest at one moment becomes the trough at the next and so on. The points of maximum vertical rise and fall are called ‘antinodes’. At the nodes particles show no vertical motion but exhibit the maximum horizontal motion. Standing waves may be caused by the meeting of two similar wave groups that are travelling in opposing directions. See seiche.

Geography

A wave where the surface oscillates vertically each side of a fixed, motionless node, with alternating up and down motion each side of it. The wavelength of a standing wave is the length of the water body it develops in (R. Davis and D. FitzGerald 2004). The most common standing wave is the seiche.

单词	standing wave
释义	standing wave Physics See stationary wave. Electronics and Electrical Engineering A wave that remains stationary, i.e. the displacement at any given point is always the same and a given displacement, such as that of a node, is not propagated along the wave. Standing waves result from the superimposition of two or more waves of the same period and usually occur when a wave is reflected totally or partially from a given barrier. Compare travelling wave. In distributed circuits any mismatch of impedances will cause reflections of the voltage or current waves at the mismatch. The superposition of the incident and reflected voltage or current waves will result in a standing wave. If the amplitudes of the incident and reflected waves are the same then the standing wave will have a maximum amplitude of twice the amplitude of the individual waves; it will also possess nulls – points of zero amplitude – where the two waves exactly cancel. These points are located at every half wavelength of the original waves. In general, the incident and reflected waves will have different amplitudes, as some of the incident energy will be absorbed at the mismatched impedance. In this case the amplitude of the standing wave will be less than the maximum value, and the minimum will be nonzero, as the waves will no longer cancel exactly. In this situation the standing-wave ratio is defined as the ratio of maximum to minimum values of the standing wave voltage or current, and it is a measure of the impedance mismatch. The voltage standing-wave ratio (VSWR) is equal to $\frac{(1 + Γ)}{(1 - Γ)}$ where Γ is the reflection coefficient of reflected to incident wave amplitudes due to the impedance mismatch. Geology and Earth Sciences Type of wave in which the surface oscillates vertically between fixed points called ‘nodes’, without any forward progression. The crest at one moment becomes the trough at the next and so on. The points of maximum vertical rise and fall are called ‘antinodes’. At the nodes particles show no vertical motion but exhibit the maximum horizontal motion. Standing waves may be caused by the meeting of two similar wave groups that are travelling in opposing directions. See seiche. Geography A wave where the surface oscillates vertically each side of a fixed, motionless node, with alternating up and down motion each side of it. The wavelength of a standing wave is the length of the water body it develops in (R. Davis and D. FitzGerald 2004). The most common standing wave is the seiche.
随便看	Moore circuit Moore, George Edward (1873–1958) Moore machine Moore-Penrose inverse Moore, Sir John (1761–1809) Moore, Stanford Moore–Penrose inverse Moore’s Law Moore’s law Moore’s paradox moorhen vitrophyric Vittorio Veneto, Battle of (October 1918) Viverridae Vives, Juan Luis (1493–1540) vivianite Viviani, Vincenzo viviparity vizier Viète, François Viète, François (1540–1603) Viète’s formulae Viète’s substitution VLA Vladimir I, St (956–1015)