Sökning: "Integral transforms"

Visar resultat 11 - 12 av 12 avhandlingar innehållade orden Integral transforms.

1. 11. Algebraic Reconstruction Methods

   Författare :Touraj Nikazad; Tommy Elfving; Constantin Popa; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; iterative methods; image reconstruction; ART; Cimmino; Kaczmarz; Landweber; sequential iteration; simultaneous iteration; block iteration; semi-convergence; relaxation parameters; stopping rules; discrepancy principle; Numerical analysis; Numerisk analys;

   Sammanfattning : Ill-posed sets of linear equations typically arise when discretizing certain types of integral transforms. A well known example is image reconstruction, which can be modeled using the Radon transform. After expanding the solution into a finite series of basis functions a large, sparse and ill-conditioned linear system occurs. LÄS MER

3. 12. Some studies within applied mathematics with focus on conditional symmetries of partial differential equations and bending waves in plates

   Författare :Reinhold Näslund; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Matematik;

   Sammanfattning : This is thesis in mathematics with special focus on applied mathematics and mathematical physics. There is an introduction (in Svedish), two papers and two addendums to the first paper. The second paper is published in an international journal. LÄS MER