“Pure” SETL is a language of very high level allowing algorithms to be programmed rapidly and succintly. SETL's representation sublanguage adds a system of declarations which allow the user of the language to control the data structures that will be used to implement an algorithm which has already been written in pure SETL, so as to improve its efficiency. Ideally no rewriting of the algorithm should be necessary. The facilities provided by the representation sublanguage and the run-time data structures that it can generate are described; based on this a heuristic which uses some of the methods of global program analysis and which should be capable of selecting an acceptably efficient representation automatically is given.
A fast and compact compilep/interpreter for SPITBOL (a variant of SNOBOL4) has been written in a machine-independent macro assembly language and implemented initially on the ICL 1900 range of computers. The interpreter uses a novel form of indirect polish code which assists portability. Compile-time pre-evaluation of constant expressions has proved to be a worthwhile optimization. A description is given in some detail of the simple but rapid scheme, requiring no marker bits, employed for garbage collection.
The oxidation of pentacyanocobaltate(H) by several molecules, namely hydrogen peroxide, hydroxylamine, and cyanogen iodide, was examined in aqueous solution. The reaction in each case conforms to the stoichiometry 2Co(CN)53-+ X-Y -Co(CN)5X3-+ Co(CN)5Y3-, where X-Y = HO-OH, HO-NH2, or I-CN. Each of the reactions exhibits second-order kinetics according to the rate lawThe values of k at 25°( M-1 sec-1), of AH± (kcal/mole), and of 5* (eu), respectively, were determined to be as follows:
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