Sökning: "shocks"

Visar resultat 1 - 5 av 246 avhandlingar innehållade ordet shocks.

  1. 1. Aspects of viscous shocks

    Författare :Malin Siklosi; GUnilla Kreiss; Smadar Karni; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Numerical analysis; hyperbolic conservation laws; viscous shocks; modified equation; shock capturing; computer-assisted proofs; Numerisk analys; Numerical analysis; Numerisk analys;

    Sammanfattning : This thesis consists of an introduction and five papers concerning different numerical and mathematical aspects of viscous shocks. Hyperbolic conservation laws are used to model wave motion and advect- ive transport in a variety of physical applications. LÄS MER

  3. 2. Essays on Health Shocks and Social Insurance

    Författare :Martin Nilsson; Per Johansson; Johan Vikström; Lars Hultkrantz; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Health shocks; Socioeconomic status; Social insurance; Social costs; Economics; Nationalekonomi;

    Sammanfattning : This thesis consists of four self-contained essays.Essay 1 (with Petter Lundborg and Johan Vikström): This paper provides new evidence on heterogeneity in the impact of health shocks by using register-based data on the entire population of Swedish workers. LÄS MER

  4. 3. Microphysical Conditioning of Gamma-Ray Burst Shocks

    Författare :Jacob Trier Frederiksen; Claes Fransson; Åke Nordlund; Mikhail V. Medvedev; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic fields; particle acceleration; plasma instabilities; gamma-ray bursts; collisionless shocks; relativistic outflows; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

    Sammanfattning : Gamma-Ray Bursts (GRBs) are believed to be connected with either collapse of massive stars or – in some cases – coalescing neutron stars, both of which cause extreme relativistic explosions observable from the entire Universe. GRBs produce rapid flashes of high energy radiation, extending up to 2MeV in photon energies: as much energy per photon as the rest mass of 4 electrons. LÄS MER

  5. 4. Banks, Shocks and Monetary Policy

    Författare :Tamás Vasi; Nils Gottfries; Stefan Pitschner; Refet Gürkaynak; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Monetary Policy; Financial Markets; Banks;

    Sammanfattning : Essay 1: This paper studies the effect of monetary policy on the economy, distinguishing the effects of exogenous monetary policy shocks from information shocks that reveal the Federal Reserve's assessment of the economic outlook. To identify these two shocks, I exploit the difference in information content in public announcements by the Fed in its statements (released on decision days) and minutes of FOMC meetings (transcripts of the policy decision, released at a later date). LÄS MER

  7. 5. Weak Boundary and Interface Procedures for Wave and Flow Problems

    Författare :Qaisar Abbas; Jan Nordström; Peter Eliasson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; weak boundary conditions; multiple penalty; finite difference methods; summation-by-parts; high order scheme; hybrid methods; MUSCL scheme; shocks; stability; energy estimate; steady-state; non-reflecting; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : In this thesis, we have analyzed the accuracy and stability aspects of weak boundary and interface conditions (WBCs) for high order finite difference methods on Summations-By-Parts (SBP) form. The numerical technique has been applied to wave propagation and flow problems. LÄS MER