Sökning: "Stability"

Visar resultat 1 - 5 av 3899 avhandlingar innehållade ordet Stability.

  1. 1. Extinctions and Ecosystem Stability

    Författare :Susanne Pettersson; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; structural stability; ecosystems; interaction structure; Generalised Lotka-Volterra; complexity; local stability; dynamical systems; stability;

    Sammanfattning : Human society's expansion and demand for both biotic and abiotic natural resources exert a large pressure on ecosystems around the globe. Ecosystems are complex networks of species interacting with each other and their physical surroundings. LÄS MER

  3. 2. Conformational Stability!? : Synthesis and Conformational Studies of Unnatural Backbone Modified Peptides

    Författare :Anna S. Norgren; Per I. Arvidsson; Norbert Sewald; Uppsala universitet; []
    Nyckelord :Organic chemistry; Conformational investigations; β-peptides; glycosylation; biomolecular recognition; cyclic β³-peptides; cyclic mixed α β²-peptides; β-peptoids; Organisk kemi;

    Sammanfattning : The beauty of the wide functionality of proteins and peptides in Nature is determined by their ability to adopt three-dimensional structures. This thesis describes artificial molecules developed to mimic secondary structures similar to those found crucial for biological activities. LÄS MER

  4. 3. Modelling, control and stability analysis of hybrid systems

    Författare :Stefan Pettersson; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; linear matrix inequalities; exponential stability; hybrid modelling; stability; time-optimal control design; nonlinear systems; hybrid systems; integrator processes; hybrid controller; LMIs;

    Sammanfattning : .... LÄS MER

  5. 4. Stability of Low-Frequency AC Railways : Models and Transient Stability

    Författare :John Laury; Lars Abrahamsson; Math Bollen; Pablo Arboleya; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Electric Power Engineering; Elkraftteknik;

    Sammanfattning : Low-frequency AC railway grids are unique in the sense that a only few countries around the world uses them, still however, they are an important parts of their countries infrastructures. Due to the usage of a dierent frequency than the public grid of the country, conversion of frequency is needed for the interconnection. LÄS MER

  7. 5. Global stability and feedback control of boundary layer flows

    Författare :Espen Åkervik; Dan S. Henningson; Luca Brandt; Dwight Barkley; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Stability; Global Stability; Feedback Control; Control; Estimation; Absolute Convective Instabilities; Model Reduction; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : In this thesis the stability of generic boundary layer flows is studied from a global viewpoint using optimization methods. Global eigenmodes of the incompressible linearized Navier-Stokes equations are computed using the Krylov subspace Arnoldi method. LÄS MER