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In physics, slowly varying envelope approximation (SVEA, sometimes also called slowly varying asymmetric approximation or SVAA) is the assumption that the envelope of a forward-travelling wave pulse varies slowly in time and space compared to a period or wavelength. This requires the spectrum of the signal to be narrow-banded—hence it also referred to as the narrow-band approximation.

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  • Slowly varying envelope approximation (en)
  • Метод медленно меняющихся амплитуд (ru)
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  • Метод медленно меняющихся амплитуд (МММА, иногда метод Ван-дер-Поля) применяется для приближенного решения нелинейных уравнений, близких к линейным, а колебания близки к гармоническим. Метод основан на допущении, что амплитуда (огибающая) волны меняется медленно во времени и пространстве по сравнению с периодом волны. Метод применяется, например, в радиофизике, нелинейной оптике. (ru)
  • In physics, slowly varying envelope approximation (SVEA, sometimes also called slowly varying asymmetric approximation or SVAA) is the assumption that the envelope of a forward-travelling wave pulse varies slowly in time and space compared to a period or wavelength. This requires the spectrum of the signal to be narrow-banded—hence it also referred to as the narrow-band approximation. (en)
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  • In physics, slowly varying envelope approximation (SVEA, sometimes also called slowly varying asymmetric approximation or SVAA) is the assumption that the envelope of a forward-travelling wave pulse varies slowly in time and space compared to a period or wavelength. This requires the spectrum of the signal to be narrow-banded—hence it also referred to as the narrow-band approximation. The slowly varying envelope approximation is often used because the resulting equations are in many cases easier to solve than the original equations, reducing the order of—all or some of—the highest-order partial derivatives. But the validity of the assumptions which are made need to be justified. (en)
  • Метод медленно меняющихся амплитуд (МММА, иногда метод Ван-дер-Поля) применяется для приближенного решения нелинейных уравнений, близких к линейным, а колебания близки к гармоническим. Метод основан на допущении, что амплитуда (огибающая) волны меняется медленно во времени и пространстве по сравнению с периодом волны. Метод применяется, например, в радиофизике, нелинейной оптике. (ru)
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