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O rural e o urbano no Brasil

Tendo como pano de fundo a natureza dos desafios que o processo de globalização coloca à intervenção das autoridades públicas responsáveis pelo desenvolvimento rural, o principal objectivo deste artigo é estabelecer um enquadramento conceptual e metodológico para a definição de uma tipologia de espaços rurais. Recorrendo à análise factorial e à análise de clusters, operacionaliza-se o quadro conceptual multidim...

Classical solutions to parabolic systems with free boundary of Stefan type

Motivated by the classical model for the binary alloy solidification (crystallization) problem, we show the local in time existence and uniqueness of solutions to a parabolic system strongly coupled through free boundary conditions of Stefan type. Using a modi¯cation of the standard change of variables method and coercive estimates in a weighted HÄolder space (the weight being a power of t) we obtain solutions ...

The dynamic analysis of piping systems using pseudo-dynamic techniques

This paper describes an application of pseudo-dynamic techniques to the dynamic analysis of piping structures. Essentially it consists in coupling a direct time integration algorithm, such as the Newmark method, to an experimental step. At each time step the integration algorithm generates a displacement vector of the structure, which is prescribed for the test specimen. This is mounted in a rigid test rig fitt...

The Dynamic Analysis of Piping Systems using Pseudo-Dynamic Techniques

Noise and Vibration Analysis of an Automobile Engine Component