Sökning: "stability estimates"

Visar resultat 1 - 5 av 109 avhandlingar innehållade orden stability estimates.

  1. 1. Reliability-based Assessment of Concrete Dam Stability

    Författare :Marie Westberg; Avdelningen för Konstruktionsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; assessment; stability; concrete dam; structural reliability analysis; probability; uplift; system reliability;

    Sammanfattning : Risk management is increasingly used in dam safety and includes risk analysis, risk evaluation and risk reduction. Structural Reliability Analysis (SRA) is a probabilistic methodology that may be used in the risk assessment process. LÄS MER

  3. 2. Stable High-Order Finite Difference Methods for Aerodynamics

    Författare :Magnus Svärd; Jan Nordström; Thomas Hagstrom; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite difference methods; high-order accuracy; summation-by-parts; stability; energy estimates; finite volume methods; Numerical analysis; Numerisk analys; Scientific Computing; Beräkningsvetenskap; Numerical Analysis;

    Sammanfattning : In this thesis, the numerical solution of time-dependent partial differential equations (PDE) is studied. In particular high-order finite difference methods on Summation-by-parts (SBP) form are analysed and applied to model problems as well as the PDEs governing aerodynamics. LÄS MER

  4. 3. Stability results for viscous shock waves and plane Couette flow

    Författare :Mattias Liefvendahl; KTH; []
    Nyckelord :nonlinear stability; shock waves; Couette flow; Chebyshev spectral method; resolvent estimates; threshold amplitudes;

    Sammanfattning : .... LÄS MER

  5. 4. Grid frequency stability from a hydropower perspective

    Författare :Elin Dahlborg; Per Norrlund; Urban Lundin; Linn Saarinen; Katherine Elkington; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Frequency control; frequency stability; grid codes; hydropower; inertia; Kaplan unit; model validation; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : Many AC grids suffer from decreased frequency stability due to less system inertia. This has increased the risk of large-scale blackouts. This thesis and its papers address the frequency stability problem from a hydropower perspective.Grid frequency stability assessments often require accurate system inertia estimates. LÄS MER

  7. 5. Political Careers, Government Stability, and Electoral Cycles

    Författare :Davide Cipullo; Eva Mörk; Luca Repetto; Vincent Pons; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Gender gaps; Self-selection; Political careers; Sticky floor; Voting; Government stability; Fragmentation; No-confidence votes; Bargaining; Brexit; Interest Groups; Forecaster behavior; Electoral cycles; Political selection; Macroeconomic forecasting;

    Sammanfattning : Essay 1: This essay investigates the impact of voter support on the representation of women in the political profession. The empirical analysis exploits two-stage elections in the United States and Italy to hold the selection of candidates constant. LÄS MER