Search for dissertations about: "time-dependence"

Showing result 21 - 25 of 41 swedish dissertations containing the word time-dependence.

  2. 21. Polymer Electrolyte Fuel Cells in Reformate Power Generators

    Author : Thomas Tingelöf; Göran Lindbergh; Per Alvfors; Jens Oluf Jensen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical; Automotive; Chemical engineering; Kemiteknik;

    Abstract : The topic of this thesis is the generation of electricity from hydrocarbon fuels via polymer electrolyte fuel cells (PEFC). The aim has been to develop methods and hardware for experimental evaluation of process parameters and design variables in PEFC reformate cells and stacks. READ MORE

  4. 22. High Order Symmetric Finite Difference Schemes for the Acoustic Wave Equation

    Author : Abraham Zemui; Bertil Gustafsson; Leif Abrahamsson; Per Weinerfelt; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite element method; mass lumping; high order; finite difference method; wave equation; Numerical Analysis; Numerisk analys;

    Abstract : When someone speaks, or when a piano is played, sound waves are spread through the room. Physically the propagation of sound is governed by the acoustic wave equation. This thesis deals with the problem of finding solutions to this equation by numerical methods. READ MORE

  5. 23. Residual stresses and shape distortion in composite structures

    Author : J. Magnus Svanberg; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymera konstruktionsmaterial; Polymeric Composite Materials;

    Abstract : High performance composites usually consist of continuous fibres and a thermoset matrix. One well-known example from the aerospace industry is carbon fibre epoxy composites. For that reason the manufacturing processes of thermoset composites are subject to extensive research. READ MORE

  6. 24. Reconfigurable and transparent wavelength division multiplexed optical transport networks

    Author : Erland Almström; KTH; []
    Keywords : ;

    Abstract : This thesis is about reconfigurable and transparentwavelength division multiplexed (WDM) networks.Reconfigurability is used to achieve higher surveillance andthroughput in the network. This is done by wavelength selectiveand independent network elements. These network elements canaccomplish bypass and protection switching ofthe traffic. READ MORE

  7. 25. Symmetry-protected topological phases: From Floquet theory to machine learning

    Author : Oleksandr Balabanov; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Topological quantum matter; neural networks; Floquet theory;

    Abstract : It is by now a well known fact that boundary states in conventional time-independent topological insulators are protected against perturbations that preserve relevant symmetries. In the first part of this thesis, accompanying Papers A - C, we study how this robustness extends to time-periodic (Floquet) topological insulators. READ MORE