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Showing result 1 - 5 of 8 swedish dissertations matching the above criteria.

2. 1. The Electronic Structure of Organic Molecular Materials : Theoretical and Spectroscopic Investigations

   Author : Iulia Emilia Brumboiu; Barbara Brena; Biplab Sanyal; Olle Eriksson; Jakob Schiøtz; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; materials theory; electronic structure; photoelectron spectroscopy; near-edge X-ray absorption fine structure; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik; Materialvetenskap; Materials Science;

   Abstract : In the present thesis the electronic properties of two organic molecules were studied by means of density functional theory (DFT) in connection to their possible applications in organic photovoltaics and molecular spintronics respectively.The first analysed system is the C60 derivative PCBM extensively used in polymer solar cells for the charge separation process. READ MORE

4. 2. Atomic Processes in Stellar Atmospheres : Inelastic Collisions and Effects on Late-type Spectra

   Author : Yeisson Fabian Martinez Osorio; Paul Barklem; Karin Lind; Nikolai Piskunov; Carlos Allende Prieto; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Spectral line: formation; atomic data; stellar abundances.; Fysik med inriktning mot astrofysik; Physics with specialization in Astrophysics;

   Abstract : Chemical abundances as measured from stellar spectral lines are often subject to uncertainties due to lack of accurate data for inelastic collisions, which is needed for non-local thermodynamic equilibrium (non-LTE) modelling. For cool stars, understanding of collision processes with electrons and hydrogen atoms is required to achieve high precision measurements. READ MORE

5. 3. An Exploration of Q-Systems : From Spin Chains to Low-Dimensional AdS/CFT

   Author : Simon Ekhammar; Dmytro Volin; Konstantin Zarembo; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum Spectral Curve; Integrability; AdS CFT; Physics and Astronomy specializing in Theoretical Physics; Fysik och astronomi med inriktning mot teoretisk fysik;

   Abstract : The discovery of integrability in the planar limit of the AdS5/CFT4 correspondence has led to impressive progress in the study of string theory and four-dimensional N=4 Super-Yang-Mills. In particular, with the formulation of the Quantum Spectral Curve (QSC) the spectral problem is now solved. READ MORE

6. 4. Scattering Amplitudes in Supersymmetric Quantum Chromodynamics and Gravity

   Author : Gregor Kälin; Henrik Johansson; Lance J. Dixon; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Scattering Amplitudes; Supersymmetric Gauge Theory; Supergravity; Quantum Chromodynamics; Physics and Astronomy specializing in Theoretical Physics; Fysik och astronomi med inriktning mot teoretisk fysik;

   Abstract : Quantum field theory is a theoretical framework for the description of nature in terms of fundamental particles, fields and their interactions. In the quantum regime, elementary scattering processes are observables in many experiments and studied in theoretical physics. READ MORE

7. 5. Bending, Twisting and Turning : Protein Modeling and Visualization from a Gauge-Invariance Viewpoint

   Author : Martin Lundgren; Antti Niemi; Jørgen Ellegaard Andersen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; protein folding; discrete frenet frame; solitons; protein visualization; Physics and Astronomy specializing in Theoretical Physics; Fysik och astronomi med inriktning mot teoretisk fysik;

   Abstract : Proteins in nature fold to one dominant native structure. Despite being a heavily studied field, predicting the native structure from the amino acid sequence and modeling the folding process can still be considered unsolved problems. In this thesis I present a new approach to this problem with methods borrowed from theoretical physics. READ MORE