8 documents found, page 1 of 1

Simulation of crashworthiness performance of thin-walled structures with adapte...

This paper presents numerical results for crashworthiness parameters of thin-walled structures with different section and trigger geometries. The improvement potential of the introduction of configurable crush triggers is analyzed. The main objective is to absorb impact energy in a progressive and controlled manner with higher efficiency and moderate peak loads. In the studied implementation different alternati...

Impacts of dilution on hydrogen combustion characteristics and nox emissions

Made available in DSpace on 2022-04-28T19:07:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-01-01; Combustion characteristics at small scales have been studied continuously due to the potential applications in portable power devices. It is known that heat release impacts at small scales result in different flame behavior as compared to conventional scales. The impacts of geometry, stoichiometry, flow...

Energy analysis of sugarcane bagasse after enzymatic catalysis process

Made available in DSpace on 2021-06-25T10:14:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01; Nowadays, countries produce approximately 1700 million tons of sugarcane per year. However, many countries now find it difficult to produce sufficient energy, generating a relevant socioeconomic impact. The objective of this work is to study the potential energy of sugarcane bagasse after decomposing fu...

New developments in isotropic turbulent models for FENE-P fluids

The evolution of viscoelastic turbulent models, in the last years, has been significant due to the direct numeric simulation (DNS) advances, which allowed us to capture in detail the evolution of the viscoelastic effects and the development of viscoelastic closures. New viscoelastic closures are proposed for viscoelastic fluids described by the finitely extensible nonlinear elastic-Peterlin constitutive model. ...

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Relação entre os hábitos alimentares e os níveis de aptidão física de praticant...

Há uma forte relação entre a Nutrição e a Actividade Física. Uma nutrição equilibrada melhora a capacidade de rendimento do organismo, incluindo os benefícios para a saúde. Neste projecto pretendemos fazer uma comparação entre os hábitos alimentares e os níveis de aptidão física de praticantes de Health Clubs. Para avaliar os hábitos alimentares utilizaremos o Questionário de Frequência Alimentar (QFA) semi-qua...

O centro comercial : ser ou não ser urbano

Dissertação de Mestrado Integrado em Arquitectura, apresentado ao Departamento de Arquitectura Dissertação de Mestrado Integrado em Arquitectura, apresentada ao Departamento de Arquitectura da Faculdade de Ciências e Tecnologia da Universidade de Coimbra.

Sheaves as modules

We revisit sheaves on locales by placing them in the context of the theory of quantale modules. The local homeomorphisms p : X → B are identified with the Hilbert B-modules that are equipped with a natural notion of basis. The homomorphisms of these modules are necessarily adjointable, and the resulting self dual category yields a description of the equivalence between local homeomorphisms and sheaves whereby m...