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1	A super computer discrete ordinates method without observable ray effects or numerical diffusion Monahan, Shean Patrick, 1961- January 1988 (has links) A new discrete ordinates method designed for use on modern, large memory, vector and/or parallel processing super computers has been developed. The method is similar to conventional SN techniques in that the medium is divided into spatial mesh cells and that discrete directions are used. However, in place of an approximate differencing scheme, a nearly exact matrix representation of the streaming operator is determined. Although extremely large, this matrix can be stored on today's computers for repeated use in the source iteration. Since the source iteration is cast in matrix form it benefits enormously from vector and/or parallel processing, if available. Several test results are presented demonstrating the reduction in numerical diffusion and elimination of ray effects. Photons -- Scattering.
2	Studies of diffractive scattering of photons at large momentum transfer and of the VFPS detector at Hera Hreus, Tomas 26 September 2008 (has links) In this thesis, two studies of the diffractive phenomena in the electron proton collisions with the H1 detector at HERA are presented.<p>The first is the study of the inclusive elastic diffractive events $ep \ / Doctorat en Sciences / info:eu-repo/semantics/nonPublished Sciences exactes et naturelles Physique Collisions (Nuclear physics) Inelastic scattering Photons -- Scattering Diffractive scattering Pomerons Collisions (Physique nucléaire) Diffusion inélastique Photons -- Diffusion Diffusion diffractive Pomerons deep inelastic scattering DIS pomeron diffractive diffraction vfps hera momentum transfer photons

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A super computer discrete ordinates method without observable ray effects or numerical diffusion

Studies of diffractive scattering of photons at large momentum transfer and of the VFPS detector at Hera