HASTE

D. J. Cardin, M. F. Lappert, and C. L. Raston, Chemistry of Organo-Zirconium and -Hafnium Compounds, Hasted Press, Division of John Wiley Sons,... 

I.J. Hastings, (ed.). Fission Product Behavior in Ceramic Oxide Fuel. Adv. in Ceramics 17, Amer. Ceram. Soc. (1986). 

WK Hastings. Monte Carlo sampling methods using Markov chains and their applications. Biometrika 57 97-109, 1970. 

Eile,/. haste speed, eilen, v.i. hasten, hurry, eilfertig, a. hasty. 

J.B. Hastings, S.M. Shapiro, and B.C. Frazer, Central-peak enhancement in hydrogen-reduced SrTiOs, Phys. Rev. Lett. 10 4 (1978). 

There exist many different CA models exhibiting BZ-like spatial waves. One of the simplest, and earliest, described in the next section, is a model proposed by Greenberg and Hastings in 1978 [green78], and based on an earlier excitable media model by Weiner and Rosenbluth [weiner46]. One of the earliest and simplest mathematical models of the BZ reaction, called the Orcgonator, is due to Field and Noyes [field74]. 

Citing a number of earlier - and, in their opinion, unnecessarily complicated -research efforts to duplicate the characteristic spatial patterns of BZ-like reactions, Greenberg and Hastings wanted to construct a model that reproduced such patterns in the simplest possible manner, doing away with the need for extensive computation as the only means by which the desired results can be obtained. Previous studies. 

The Greenberg-Hastings model [green78] uses the two-dimensional von-Neumann neighborhood and assumes that each site is populated by variables a that take on one of three values 0,1,2. It is important to have at least three values... 

Fig. 8.14-b Greenberg-Hastings model of the BZ-reaction 320 x 200 lattice after 500 iteration steps, starting from a random initial state consisting of 5% active and 5% refractory sites. 

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