Sökning: "Jan Lundquist"
Hittade 5 avhandlingar innehållade orden Jan Lundquist.
1. High order summation-by-parts methods in time and space
Sammanfattning : This thesis develops the methodology for solving initial boundary value problems with the use of summation-by-parts discretizations. The combination of high orders of accuracy and a systematic approach to construct provably stable boundary and interface procedures makes this methodology especially suitable for scientific computations with high demands on efficiency and robustness. LÄS MER
2. Kroppens medborgarfostran : Kropp, klass och genus i skolans fysiska fostran 1919-1962
Sammanfattning : The problem forming the basis of this study is why Ling gymnastics, a product of the early 19th Century, was constantly practised in Swedish state-run schools during the 1950s despite the fact that, from the beginning of the 20th Century, it had been questioned by scientists and faced stiff competition from sport. The thesis approaches the question in relation to the state and the body. LÄS MER
3. Managing uncertainties through efficient calculation of transients and harmonic propagation in power systems
Sammanfattning : The electric power system is undergoing changes including large-scale introduction of renewable energy sources together with HVDC/FACTS, changes in the network such as increased amount of high voltage cables, industrial electrification, and changes in the load composition. These changes will impact the system in different ways and lead to challenges that must be addressed to facilitate planning, dimensioning, and operation of the system in a secure and economical way. LÄS MER
4. Till stratigraphy and ice recession in the Bothnian Bay
Sammanfattning : .... LÄS MER
5. Pressure driven instabilities in the reversed-field pinch : numerical and theoretical studies
Sammanfattning : According to classical linearized resistive magnetohydrodynamics theory, pressuredriven modes are unstable in the reversed-field pinch (RFP) due to unfavorable magnetic field line curvature. The result is based on the assumption of an adiabatic energy equation where anisotropic thermal conduction effects are ignored as compared to convection and compression. LÄS MER