Browsing Department of Physics / Institutionen för fysik by Title
Now showing items 54-73 of 82
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Periodized Thermal Greens Functions and Applications
(2013-08-30)This work describes a new formalism for Fermionic thermal Greens functions that are discretized in imaginary time. The discretization makes the thermal Greens function periodic in imaginary (Matsubara) frequency space and ... -
Prospects for performing tests of quantum electrodynamics with high-intensity lasers
(2023)Charged particles emit radiation in the presence of strong electromagnetic fields. Emission implies a recoil on the charge, altering its dynamics and is referred to as radiation reaction (RR). Current experiments are on ... -
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, ... -
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 ... -
Smart microswimmers in complex flows
(2022)Zooplankton are playing a pivotal role in balancing the life on Earth. By grazing on phytoplankton and then serving as food source to larger aquatic animals, they pave the way of redistributing the Sun’s energy and ... -
Spectroscopic studies of the negative state of atoms
(2020-08-13)Negative ions are of fundamental interest in atomic physics due to the enhanced importance of the electron correlation. In this thesis new spectroscopic methods have been developed and then applied to study the nature of ... -
Spectroscopy of Stable and Radioactive Negative Ions
(2023-04-03)Negative ions are unique quantum systems which are of fundamental interest within the field of atomic physics due to the importance of the electron correlation in their creation, stability, and existence. Properties of ... -
Spin Hall nano-oscillator arrays: towards GHz neuromorphics
(2019-08-28) -
Spin Torque and Spin Hall Nano-Oscillators with Single Magnetic Layers
(2015-05-07)Spin-torque oscillators (STOs) are capable of producing tunable broadband high-frequency signals within a nanometer-sized region. In this thesis, novel designs for STOs will be discussed; the common theme of these designs ... -
Strong-Field Photodetachment of Negative Ions – Orbital Alignment Effects and Tomographic Imaging of Photoelectrons
(2015-09-07)Photoelectron imaging techniques are used to experimentally investigate photodetachment of negative ions in a strong laser-field as well as the orbital alignment dynamics in the residual neutral. Strong-field ... -
Strongly non-linear magnetization dynamics in nano-structures: perturbations, multi-mode generation, and topological droplets
(2014-05-12)Spin torque oscillators (STOs) are magnetic nano-devices in which strongly non-linear magnetodynamic phenomena can be excited by current. In this thesis, we study some of these phenomena by means of micromagnetic simulations, ... -
Structure-Specific Vibrational Modes of Isolated Biomolecules Studied with Mid- and Far-Infrared Laser Spectroscopy
(2019-01-14)Biomolecular structure elucidation is crucial for our detailed understanding of various biological processes, since there is an intimate relationship between the biomolecular function and structure. In this respect, isolated ... -
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 ... -
Symmetry-protected topological phases: From Floquet theory to machine learning
(2020-08-18)It is by now a well known fact that boundary states in conventional time-independent topological insulators are protected against perturbations that preserve relevant symmetries. In the first part of this thesis, ... -
Synchronization Phenomena in Spin Torque and Spin Hall Nano-Oscillators
(2017-05-15)Spin-torque oscillators (STOs) belong to a novel class of spintronic devices and exhibit a broad operating frequency and high modulation rates. STOs take advantage of several physical phenomena such as giant magnetoresistance ... -
TBA
(2020) -
Teacher Change in relation to Professional Development in Entrepreneurial Learning
(2013-12-02)Abstract Compulsory school teachers’ perceptions and change in relation to Continuing Professional Development (CPD) in entrepreneurial learning are investigated in this thesis. The teacher level focus is based on evidence ... -
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 ... -
Thermodynamics of microscopic environments: From anomalous diffusion to heat engines
(2021-05-17)Till skillnad från deras makroskopiska motsvarigheter utvecklas inte mikroskopiska system deterministiskt på grund av inverkan från termiskt brus. Sådana system är föremål för fluktuationer som endast kan studeras inom ...