Sökning: "Magnus Ögren"

Hittade 3 avhandlingar innehållade orden Magnus Ögren.

1. 1. Semiclassical Analysis of Super-Shell Structure in Trapped Fermi Gases

   Författare :Magnus Ögren; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:2008:Ögren;

   Sammanfattning : This dissertation investigates the oscillation part of the level density for trapped fermions. Analytical so-called trace formulae have been known for the two theoretically important potentials, the spherical cavity and harmonic oscillator, since more than thirty years. LÄS MER

3. 2. Semiclassical interpretation of super-shells in trapped fermionic gases

   Författare :Magnus Ögren; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : We give an analysis, based on periodic orbit theory, of the super-shell structure observed in numerical Hartree-Fock calculations for trapped fermions.... LÄS MER

4. 3. A moving boundary problem for capturing the penetration of diffusant concentration into rubbers : Modeling, simulation and analysis

   Författare :Surendra Nepal; Adrian Muntean; Yosief Wondmagegne; Magnus Ögren; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Moving boundary problem; finite element method; a priori error estimate; a posteriori error estimate; order of convergence; diffusion of chemicals into rubber; swelling; Matematik; Mathematics;

   Sammanfattning : We propose a moving-boundary scenario to model the penetration of diffusants into rubbers. Immobilizing the moving boundary by using the well-known Landau transformation transforms the original governing equations into new equations posed in a fixed domain. LÄS MER