A bstract. T he periodic behavior of a particu lar class of dynamical sys tems , the cellular automata (CA) , is studied . A lar ge class of CAs is defined , (containing both addit ive and nonadditive CAs) in terms of the sensi tivity of t he local rule on which the CA is based . For this class , the set of configurations which ente r a cycle afte r a finit e number of it erat ions is complete ...

Radiochemical methods of analysis possess some special advantages , such as rapidity and great sensi t ivi ty, and can on occasion provide results which would not be attainable by other means. They are finding an increasing number and variety of applications not only in pure research, but in medicine and heal th, in many industries such as mining, text i les , metallurgy and the oil industry, a...

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