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Internal diffusion is the spread of information and innovations within a network, flowing within a single adopting population – a given industry or geographical network. Internal diffusion dynamics require that innovative and early adopter firms introduce new ideas into a network, which are then picked up by the majority of firms and laggard ...
Diffusion of innovations is a theory that seeks to explain how, why, and at what rate new ideas and technology spread. The theory was popularized by Everett Rogers in his book Diffusion of Innovations , first published in 1962. [ 1 ]
The Bass diffusion model is used to estimate the size and growth rate of these social networks. The work by Christian Bauckhage and co-authors [ 10 ] shows that the Bass model provides a more pessimistic picture of the future than alternative model(s) such as the Weibull distribution and the shifted Gompertz distribution.
In contrast to Childe's moderate position, which allowed the diffusion of ideas and even moderate migration, Soviet archaeology adhered to a form of extreme evolutionism, which explained all cultural change from the class tensions internal to prehistoric societies. [4] "Migrationism" fell from favour in mainstream western archeology in the 1970s.
An animation describing diffusion. A tutorial on the theory behind and solution of the Diffusion Equation. NetLogo Simulation Model for Educational Use (Java Applet) Short movie on brownian motion (includes calculation of the diffusion coefficient) A basic introduction to the classical theory of volume diffusion (with figures and animations)
Map of the Roman empire with distribution of Christian congregations displayed for each century. Christianization of the Roman Empire as diffusion of innovation looks at religious change in the Roman Empire's first three centuries through the lens of diffusion of innovations, a sociological theory popularized by Everett Rogers in 1962.
The general equation can then be written as [6] = + + (),. where the "force" term corresponds to the forces exerted on the particles by an external influence (not by the particles themselves), the "diff" term represents the diffusion of particles, and "coll" is the collision term – accounting for the forces acting between particles in collisions.
Diffusion-limited aggregation (DLA) is the process whereby particles undergoing a random walk due to Brownian motion cluster together to form aggregates of such particles. . This theory, proposed by T.A. Witten Jr. and L.M. Sander in 1981, [1] is applicable to aggregation in any system where diffusion is the primary means of transport in the sy