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Modelos regret aplicados a problemas de localização

Tese de Doutoramento em Ciências Económicas e Empresariais (Planeamento Económico e Métodos Quantitativos). ; Dada a importância da prestação de serviços face à procura existente e aos custos inerentes à sua configuração, os problemas de localização são de suma importância quer no quotidiano quer no meio científico. Na tentativa de captar as particularidades desses sistemas e fazer uma aproximação à realidade,...

Catastrophic Job Destruction

Sobre a Sensibilidade Cíclica dos Salários

Melamine/epichlorohydrin prepolymers: syntheses and characterization

The basic catalysis of melamine with epichlorohydrin gives prepolymers that can be used in the preparation of energetic materials. In this work, sodium hydroxide and triethylamine were used as catalysts and ethyleneglycol as initiator. Different reaction conditions were tested and the characterization of the products was carried out by IR and NMR spectroscopy and MS spectrometry, hydroxyl groups content, vapour...

Cyanuric Acid/Epichlorohydrin Energetic Prepolymers

In this work new energetic prepolymers are synthesised and characterised. The structure of the prepolymers exhibits the 1,3,5-s-triazine ring with lateral chains derived from the epichlorohydrin ring opening. The chlorine atoms in these precursors are here substituted by azido groups. The presence of these groups was confirmed by FTIR and 1H NMR spectroscopy and elemental and thermal analysis. OH group content ...