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An experimental examination of charge-neutralised ion beam etching of a range of thin-film and bulk materials indicates an oscillatory etch rate function superimposed on the accepted sputter-yield/ion-beam-energy characteristic. The perturbation was affected by the beam neutralisation.
Some properties of multiprocessing systems, i.e. computing systems in which a set of computational elements share a pool of storage elements are investigated. In particular, the conditions for the output-functionality of these systems are studied, where a computing systems is defined as being output-functional when it produces the same sequence of outputs for the same program, initial state, and input...
An infinite sequence over a finite alphabet is regular if the indices of those positions at which each given symbol occurs in the sequence constitute a set of numbers which in suitable base is recognizable by a finite automaton. A sequence obtained by deleting from a regular sequence all occurrences of certain symbols is semi-regular. Semi-regular sequences are alternatively characterizable as those...
A regular event W is a star event iff there exists another event V such that W = V*. In that case, V is called a root of W. It is shown that every regular event has a unique minimum root, which is contained in every other root of W. An algorithm for finding the minimum root is presented, and the root is shown to be regular. The results have applications to languages, codes, canonical forms for regular...
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