Search for dissertations about: "Complex Scaling Method"

Showing result 1 - 5 of 50 swedish dissertations containing the words Complex Scaling Method.

2. 1. Bound states and resonances in three-body system

   Author : Yarevsky Evgeny; Thomas N. Rescigno; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Three-body problem; Total angular momentum representation; Resonances; Complex Scaling Method; Finite Element Method; Eigenvalues problem.; Physics; fysik;

   Abstract : The quantum three-body problem plays an important role in different branches of the modern physics. In the nuclear, atomic and molecular physics there exist a number of systems whose behaviour is naturally described in this framework. READ MORE

4. 2. Aspects of adaptive mesh refinement in the spectral element method

   Author : Nicolas Offermans; Philipp Schlatter; Ananias Tomboulides; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Error estimators; mesh refinement; adaptivity; spectral element method; algebraic multigrid method; NACA4412; periodic hill case.; Engineering Mechanics; Teknisk mekanik;

   Abstract : This thesis deals with the improvement of the efficiency of numerical simulations in computational fluid dynamics. Some of the limitations of current algorithms on future exascale supercomputers are addressed with the main goal of using adaptive mesh refinement for the simulation of turbulent and three-dimensional flows. READ MORE

5. 3. On the use of the uniform complex scaling-method for studying time-dependent systems

   Author : Jakob Bengtsson; Eva Lindroth; Nimrod Moiseyev; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; kemisk fysik; Chemical Physics;

   Abstract : During the last few decades, laser technology has gone through a series of revolutionary improvements. With light pulses in the sub-femtosecond regime now experimentally available, an explicit time-dependent Hamilton operator is indispensable for a proper theoretical description of the interactions of atoms with such pulses. READ MORE

6. 4. Ways of determining and characterising resonances in scattering processes

   Author : Ksenia Shilyaeva; Nils Elander; Dage Sundholm; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum scattering theory; complex scaling; resonances; Molecular physics; Molekylfysik; fysik; Physics;

   Abstract : Scattering cross sections very often display structures. To clarify if these structures correspond to resonances one has to check if they are poles of the scattering matrix (S-matrix) in the fourth quadrant of the complex momentum plane. Furthermore, the states corresponding to these poles also need to have an appropriate scattering amplitude. READ MORE

7. 5. Towards adaptive mesh refinement in Nek5000

   Author : Nicolas Offermans; Philipp Schlatter; Adam Peplinski; Paul Fischer; Chris Cantwell; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Error estimators; mesh refinement; adaptivity; spectral element method; algebraic multigrid method; Engineering Mechanics; Teknisk mekanik;

   Abstract : The development of adaptive mesh refinement capabilities in the field of computational fluid dynamics is an essential tool for enabling the simulation of larger and more complex physical problems. While such techniques have been known for a long time, most simulations do not make use of them because of the lack of a robust implementation. READ MORE