An original computer-controlled solid-state photometer has been developed and its potential for simultaneous multicomponent flow-injection analysis of binary and ternary mixtures is demonstrated. The device is simple in construction. Its principle of operation is based on rapid sequential measurements of the absorbance of the complexes formed by the analytes with chromogenic reagents at the wavelengths corresponding to the emission maxima of three light emitting diodes (563, 580 and 638 nm).
SUMMARYOptimization of element tolerances is a very important but also time consuming part of integrated circuit design. In this paper an algorithm is presented for the worst case optimal assignment of large change tolerances, in which a significant simplification of the problem is obtained for a class of linear circuits. This is due to taking advantage of the bilinear dependence of the network functions on element values and to some simplifications assumed. The minimal cost of the circuit is the objective function.
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