Search for dissertations about: "Tobias A Persson"

Showing result 1 - 5 of 8 swedish dissertations containing the words Tobias A Persson.

  2. 1. Mitigating climate change - The role of developing countries

    Author : Tobias A Persson; Chalmers tekniska högskola; []
    Keywords : ;

    Abstract : The objective of the UN Framework Convention on Climate Change is to stabilize greenhouse gases in the atmosphere at a level that prevents dangerous anthropogenic interference with the climate system. It is still politically and scientifically uncertain at which level greenhouse gases must be stabilized to achieve this objective. READ MORE

  4. 2. Extraction and Isolation of Hemicelluloses from Agricultural and Forestry Waste Streams

    Author : Tobias Persson; Avdelningen för kemiteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : New methods and products must be developed to reduce our dependency on fossil fuels, to reduce global warming. In this work, methods of extracting and isolating hemi¬celluloses from agricultural and forestry waste streams have been studied. READ MORE

  5. 3. Beam-Based Error Identification and Correction Methods for Particle Accelerators

    Author : Tobias Persson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Emittance; Accelerator Optics; LHC; Pulse Compressor; Feedback; Two-beam acceleration; Accelerators; CLIC; Radio Frequency; CTF3;

    Abstract : Modern particle accelerators have tight tolerances on the acceptable deviation from their desired machine parameters. The control of the parameters is of crucial importance for safe machine operation and performance. This thesisfocuses on beam-based methods and algorithms to identify and correct errors in particle accelerators. READ MORE

  6. 4. Optics Corrections and Stabilization Methods for Particle Accelerators

    Author : Tobias Persson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; LHC; accelerators; beam optics; ; feedback; CTF3; optics correction; CLIC;

    Abstract : The discovery of a Higgs-like particle is the result of excellent performance ofboth the LHC (Large Hadron Collider) and its detectors. A significant partof the success can be attributed to the excellent control of the optics in theaccelerator. In this thesis the methods used to correct the optics functions arepresented. READ MORE

  7. 5. Numerical Simulation of High Reynolds Number Wall Bounded Flow

    Author : Tobias Persson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; subgrid model; DES; high; validation; LES; numerical simulation; near-wall;

    Abstract : In this thesis, four different numerical methods are used for predictions of high Reynoldsnumber (Re), wall bounded flows; Large Eddy Simulation (LES) with two different subgrid(turbulence) models, the One Equation Eddy Viscosity model (OEEVM) and the MixedModel (MM), Monotone Integrated LES (MILES), Detached Eddy Simulation (DES) andReynolds Averaged Navier Stokes (RANS). The LES calculations are combined with a wallmodel based on the law-of-the-wall and in DES a hybrid RANS/LES method is used forhandling the near wall region. READ MORE