No abstract

Aircraft fuels, called jet propulsion, are used in several areas of activity within aeronautics. There are jet fuels based on kerosene, that is, those obtained commercially, and there are synthetics produced in the laboratory. All of these fuels are included within the so-called propellants. In this article, Jet propulsion-8 (JP 8) fuel was used as the basis for data analysis, and thus two temperature ranges were analyzed. The first range, from 300 to 2500 K, was analyzed for specific heat, enthalpy and entropy. Based on theoretical and experimental data, artificial neural networks (ANNs) were developed to identify these properties in other working conditions, that is, at other temperatures.

The analysis of time varying electromagnetic fields in conductor media can be done by an integral equation in terms of the current density vector. For time domain solutions concerning complex structures, numerical procedures are useful and, for their correct application, stability conditions must be defined. In this paper conditions of applicability are analyzed and simulation examples are shown for two numerical procedures aiming to solve problems associated with transient currents.

Tolosa, T. A. G. de. Uma proposta para análise otimizada de correntes transitórias em materiais condutores. Tese apresentada à Escola Politécnica da Universidade de São Paulo para obtenção do título de Doutor em Engenharia. Aprovado em 29 de abril de 2010.