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In statistical mechanics, the mean squared displacement (MSD, also mean square displacement, average squared displacement, or mean square fluctuation) is a measure of the deviation of the position of a particle with respect to a reference position over time. It is the most common measure of the spatial extent of random motion, and can be thought of as measuring the portion of the system "explored" by the random walker. In the realm of biophysics and environmental engineering, the Mean Squared Displacement is measured over time to determine if a particle is spreading slowly due to diffusion, or if an advective force is also contributing. Another relevant concept, the variance-related diameter (VRD, which is twice the square root of MSD), is also used in studying the transportation and mixin

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  • Die mittlere quadratische Verschiebung (englisch mean squared displacement MSD) ist in der statistischen Physik ein Maß für die Strecke, die ein Teilchen im Mittel (z. B. über viele Versuche) in einer gewissen Zeit zurücklegt. Dieses Maß ist besonders bei der Beschreibung Brownscher Dynamik und anderen Zufallsbewegungen wichtig, da dort typischerweise keine ausgezeichnete Richtung vorliegt, entlang der man eine zurückgelegte Strecke messen könnte. (de)
  • En mecánica estadística, el desplazamiento cuadrático medio (MSD, por sus siglas en inglés) es la medida más común de la difusión de partículas con movimiento aleatorio; se puede visualizar como la cantidad de un sistema «explorado» por un caminante que sigue un recorrido aleatorio. Aparece prominentemente en el factor de Debye-Waller, que describe vibraciones dentro del estado sólido, y en la ecuación de Langevin para caracterizar la difusión de una partícula browniana. (es)
  • In statistical mechanics, the mean squared displacement (MSD, also mean square displacement, average squared displacement, or mean square fluctuation) is a measure of the deviation of the position of a particle with respect to a reference position over time. It is the most common measure of the spatial extent of random motion, and can be thought of as measuring the portion of the system "explored" by the random walker. In the realm of biophysics and environmental engineering, the Mean Squared Displacement is measured over time to determine if a particle is spreading slowly due to diffusion, or if an advective force is also contributing. Another relevant concept, the variance-related diameter (VRD, which is twice the square root of MSD), is also used in studying the transportation and mixing phenomena in the realm of environmental engineering. It prominently appears in the Debye–Waller factor (describing vibrations within the solid state) and in the Langevin equation (describing diffusion of a Brownian particle). The MSD at time is defined as an ensemble average: where N is the number of particles to be averaged, vector is the reference position of the -th particle, and vector is the position of the -th particle at time t. (en)
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  • Die mittlere quadratische Verschiebung (englisch mean squared displacement MSD) ist in der statistischen Physik ein Maß für die Strecke, die ein Teilchen im Mittel (z. B. über viele Versuche) in einer gewissen Zeit zurücklegt. Dieses Maß ist besonders bei der Beschreibung Brownscher Dynamik und anderen Zufallsbewegungen wichtig, da dort typischerweise keine ausgezeichnete Richtung vorliegt, entlang der man eine zurückgelegte Strecke messen könnte. (de)
  • En mecánica estadística, el desplazamiento cuadrático medio (MSD, por sus siglas en inglés) es la medida más común de la difusión de partículas con movimiento aleatorio; se puede visualizar como la cantidad de un sistema «explorado» por un caminante que sigue un recorrido aleatorio. Aparece prominentemente en el factor de Debye-Waller, que describe vibraciones dentro del estado sólido, y en la ecuación de Langevin para caracterizar la difusión de una partícula browniana. (es)
  • In statistical mechanics, the mean squared displacement (MSD, also mean square displacement, average squared displacement, or mean square fluctuation) is a measure of the deviation of the position of a particle with respect to a reference position over time. It is the most common measure of the spatial extent of random motion, and can be thought of as measuring the portion of the system "explored" by the random walker. In the realm of biophysics and environmental engineering, the Mean Squared Displacement is measured over time to determine if a particle is spreading slowly due to diffusion, or if an advective force is also contributing. Another relevant concept, the variance-related diameter (VRD, which is twice the square root of MSD), is also used in studying the transportation and mixin (en)
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  • Mittlere quadratische Verschiebung (de)
  • Desplazamiento cuadrático medio (es)
  • Mean squared displacement (en)
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