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Studies on the gamma radiation environment in Sweden with special reference to 137Cs
(2008-09-05)Gamma radiation in the environment today mainly originates from naturally occurring radionuclides, but anthropogenic radionuclides, such as 137Cs, contribute in some areas. In order to assess population exposure in case ... -
Susceptibility effects in MRI and 1H MRS. The spurious echo artifact and susceptibility measurements.
(2009-01-29)When performing magnetic resonance (MR) experiments, a strong homogeneous magnetic field is often preferred, especially in clinical applications. However, all objects that are placed in the magnetic field will disturb the ... -
Towards quantitative single cell analysis using optical tweezers and microfluidics
(2009-04-03)Experiments on single cells have the potential to uncover information that would not be possible to obtain with traditional biological techniques, which only reflect the average behavior of a population of cells. In the ... -
Laser Photodetachment of Negative Ions - Fundamental Research and Applications
(2009-05-07)Photodetachment studies of atomic and molecular negative ions in the gas phase are presented. Negative ions are loosely bound quantum systems whose existence is strongly dependent on the correlations between the electrons. ... -
In Silico Studies of Carbon Nanotubes and Metal Clusters
(2010)Carbon nanotubes have been envisioned to become a very important material in various applications. This is due to the unique properties of carbon nanotubes which can be exploited in applications on length scales spanning ... -
Quantitative analysis of tumor growth and response to therapy
(2010-01-14)Modeling the natural growth of tumors is of value for evaluation of tumor progression and optimization of treatment strategies. However, modeling tumor growth based on clinical data is hampered by the limited data available, ... -
Ionization of large molecules with short laser pulses
(2010-03-24)The decay dynamics of fullerenes and polyaromatic hydrocarbons (PAH) after femtosecond-laser excitation have been studied experimentally by electron momentum mapping and mass spectrometry. The electron spectra of fullerenes ... -
Towards a relativistically covariant many-body perturbation theory - With numerical implementation to helium-like ions
(2010-03-30)The experimental results for simple atomic systems have become more and more accurate and in order to keep up with the experimental achievements the theoretical procedures have to be refined. Recent accurate experimental ... -
Carbon Nanotube Transistors: Nanotube Growth, Contact Properties and Novel Devices
(2010-04-13)Carbon nanotubes (CNTs) are envisioned to be used as the basic building blocks in future electronics due to their excellent electronic properties such as high mobility, compatibility with high-k dielectrics and small ... -
Mesoscopic phenomena in the electromechanics of suspended nanowires
(2011-03-25)Over the last two decades nanotechnology has been a very active field of scientific research, both from fundamental perspectives as well as for applications in technology and consumer goods. In this thesis, theoretical ... -
Inertial collisions in random flows
(2011-05-13)In nature, suspensions of small particles in fluids are common. An important example are rain droplets suspended in turbulent clouds. Such clouds can start to rain very quickly and the reason for this is still not fully ... -
Electronic Control of Flexural Nanowire Vibrations
(2011-05-19)“Nanoelectromechanical systems” (NEMS) are nanometer-sized mechanical structures coupled to electronic devices of comparable size. The coupling between mechanical and electronic degrees of freedom, combined with their ... -
Two-Electron Excitations in Negative Ions
(2011-10-07)The main goal of this work has been to increase the knowledge of electron-electron correlation through experimental studies of negative ions. Negative ions are atoms or molecules to which an extra electron has been attached. ... -
Nanoelectromechanical systems from carbon nanotubes and graphene
(2012-01-02)Carbon nanotubes and graphene have many interesting properties. To exploit the properties in applications their synthesis and incorporation in devices has to be understood and controlled. This thesis is based on experimental ... -
Thermal properties of clusters and molecules - Experiments on evaporation, thermionic emission, and radiative cooling
(2012-02-03)This thesis presents experiments performed on clusters and molecules, where the three channels of unimolecular decay have been studied. Evaporation from protonated and negatively charged water cluster have yielded size ... -
Self Oscillations and Cooling of Carbon Based NEMS Devices
(2012-04-10)We investigate the electromechanical properties of a number of system geometries featuring a doubly clamped Carbon Nanotube or Graphene sheet with a deflection sensitive resistance and an electronic feedback in the form ... -
Interaction and disorder in helical conductors
(2012-09-28)Different effects from electron-electron interactions and disorder in helical and quasi-helical conductors are studied using bosonisation and renormalisation group methods. The combined effects of Rashba spin-orbit ... -
Non-linear Optical Microscopy and Spectroscopy for Biomedical Studies
(2012-11-21)This thesis is based on the application of non-linear optical microscopy and spectroscopy techniques within biomedical research. Non-linear optical microscopy gives the possibility of exciting fluorophores using near ... -
Modelling late toxicity in hypofractionated radiation therapy
(2013-02-22)In hypofractionated radiation therapy (RT), the treatment is delivered by few fractions with high doses per fraction. This is in contrast to conventionally fractionated RT where the total dose is delivered in many fractions ... -
Correlated Materials - Models & Methods
(2013-03-12)This thesis encompass a series of studies on methods and models for electron systems with local interactions, relevant for correlated materials. The first study focus on the canonical model for local correlation, the Hubbard ...