Cover: Weighted Digraph Models for Energy Use and Air Pollution in Transportation Systems
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Weighted Digraph Models for Energy Use and Air Pollution in Transportation Systems

by Fred S. Roberts

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Describes extensions to weighted and double-weighted digraphs from the author's earlier work on building and analyzing energy demand signed digraphs. Several weighted and double-weighted digraphs are built to test the construction methodology, to test the methods of analysis of such digraphs, and to illustrate the type of analysis possible using such digraphs as models of complex systems. The digraphs are constructed within the context of the transportation system of a hypothetical metropolitan area similar to the County of San Diego, California. The digraphs are used to compare fuel consumption and air pollution using two scenarios. Conclusions are compared and contrasted, and potential areas of applicability of the digraph methodology are described. (See also R-756, R-926, R-927/1, R-927/2.)

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