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Qu'est-ce (qui) est liste de diffusion - définition

Bohm-diffusion; Bohm Diffusion

Diffusion bonding

Diffusion bonding or diffusion welding is a solid-state welding technique used in metalworking, capable of joining similar and dissimilar metals. It operates on the principle of solid-state diffusion, wherein the atoms of two solid, metallic surfaces intersperse themselves over time.

https://en.wikipedia.org/wiki/Diffusion_bonding

Diffusion map

DIMENSIONAL REDUCTION ALGORITHM

Diffusion maps

Diffusion maps is a dimensionality reduction or feature extraction algorithm introduced by Coifman and Lafon which computes a family of embeddings of a data set into Euclidean space (often low-dimensional) whose coordinates can be computed from the eigenvectors and eigenvalues of a diffusion operator on the data. The Euclidean distance between points in the embedded space is equal to the "diffusion distance" between probability distributions centered at those points.

https://en.wikipedia.org/wiki/Diffusion_map

Reaction–diffusion system

TYPE OF MATHEMATICAL MODEL

Reaction diffusion; Reaction-diffusion equation; Reaction diffusion equation; Reaction diffusion system; Reaction-diffusion system; Reaction-diffusion model; Reaction diffusion model; Reaction-diffusion; Reaction–diffusion; Turing instability; Reaction–diffusion equations; Reaction–diffusion equation; Reaction-diffusion equations; Newell-Whitehead-Segel equation; Reaction-diffusion systems; Reaction–diffusion systems; Reaction Diffusion; Kolmogorov-Petrovsky-Piskounov equation; Reaction-diffusion mechanism; Gray–Scott model; Gray-Scott model; Zeldovich equation; Barkley model; Diffusion-driven instability; Newell–Whitehead–Segel equation

Reaction–diffusion systems are mathematical models which correspond to several physical phenomena. The most common is the change in space and time of the concentration of one or more chemical substances: local chemical reactions in which the substances are transformed into each other, and diffusion which causes the substances to spread out over a surface in space.

https://en.wikipedia.org/wiki/Reaction–diffusion_system

Wikipédia

Bohm diffusion

The diffusion of plasma across a magnetic field was conjectured to follow the Bohm diffusion scaling as indicated from the early plasma experiments of very lossy machines. This predicted that the rate of diffusion was linear with temperature and inversely linear with the strength of the confining magnetic field.

The rate predicted by Bohm diffusion is much higher than the rate predicted by classical diffusion, which develops from a random walk within the plasma. The classical model scaled inversely with the square of the magnetic field. If the classical model is correct, small increases in the field lead to much longer confinement times. If the Bohm model is correct, magnetically confined fusion would not be practical.

Early fusion energy machines appeared to behave according to Bohm's model, and by the 1960s there was a significant stagnation within the field. The introduction of the tokamak in 1968 was the first evidence that the Bohm model did not hold for all machines. Bohm predicts rates that are too fast for these machines, and classical too slow; studying these machines has led to the neoclassical diffusion concept.

https://en.wikipedia.org/wiki/Bohm diffusion