Filtyp
We study the rapid decrease of peak gain in resonant-phonon THz Quantum Cascade Lasers with increasing temperature. The effect of various microscopic scattering processes on the gain profile as a function of temperature is discussed. We argue that increased broadening, prim arily due to increased impurity scattering, and not diminishing population inversion, is the main reason for the reduction o
This study investigates the size and power properties of three multivariate tests for autocorrelation, namely portmanteau test, Lagrange multiplier (LM) test and Rao F-test, in the stable and unstable vector autoregressive (VAR) models, with and without autoregressive conditional heteroscedasticity (ARCH) using Monte Carlo experiments. Many combinations of parameters are used in the simulations to
The time-dependent traveling salesman problem (TDTSP) is a variant of TSP with time-dependent edge costs. We study some restrictions of TDTSP where the number of edge cost changes are limited. We find competitive ratios for online versions of TDTSP. From these we derive polynomial time approximation algorithms for graphs with edge costs one and two. In addition, we present an approximation algorit
Background: Electrocardiogram-derived grades of ischemia at the time of patient presentation with acute myocardial infarction have proved useful in predicting the salvageability by reperfusion therapy, final infarct size, severity of left ventricular dysfunction, and short- and long-term prognosis. Subjects and Methods: The Sclarovsky-Birnbaum Ischemia Grading System based on the relation between
The purpose of this study was to gain a greater understanding on how healthcare workers, particularly caregivers of elderly and dementia patients, are impacted by a Mindfulness-based Stress Reduction (MBSR) training and to explore the reasons a manager has for incorporating these types of trainings. Within the scope of this qualitative study, we conducted semi-structured interviews with nine careg
We study a 1+1 dimensional Yang-Mills model in the light-cone gauge (the ’t Hooft model). The colour group is SU (N ) and we study the limit N → ∞, the limit is taken such that g²N is kept constant. In this limit the only contributing diagrams are planar diagrams without gluon-gluon interactions. Using this, it is shown that there are no free quarks in this model. The bound state wave equation is
Embedded systems are hard to debug and the field of control software testing is relatively unexplored. Progress in these areas could provide better testing heuristics and safer systems. More specifically, hardware emulation is a potentially powerful tool that can help improve the speed and quality of the development cycle. Therefore, this study developed a hardware emulator for supporting embedded
This work presents the first data from a calculation engine for synchrotron Microbeam Radiation Therapy (MRT) implemented in the EclipseTM Treatment Planning System from Varian Medical Services. The calculation engine constitutes a simple pencil beam algorithm estimating ‘peak’ dose and of Monte Carlo simulated Peak Valley Dose Ratios (PVDRs) that are used to obtain ‘valley’ dose. The aim of this
This thesis explores the under-recognised yet symptomatic visual motif of two women, a recurring theme within a vast array of pictorial examples. Its primary objective is to construct a theoretical and methodological framework capable of comprehending the multiplicity of images in the form of an image collection: The Atlas of Two Women. This inquiry primarily draws on Walter Benjamin’s concept of
The number of devices connected to the Internet is rapidly increasing. Especially the number of Internet of Things devices. These devices contain software which, like any other software, needs to be updated. With the great amount of devices to update, this calls for a manageable updating solution which does not depend on user interaction. In this thesis we present a solution to dynamically update
The aim of this study was to optimize a function starch-ethyl cellulose film for targeting the therapeutically active substance to the colon in the disease state for patients suffering from inflammatory bowel diseases. This study includes: • The preparation of the polymeric films and the investigation of the characterization (for example mechanical properties, water uptake, dry mass loss, and mic
Sweden has seen an increased number of homeless EU citizens over the last years. There is no consensus among Swedish municipalities on how to handle the issue of housing for vulnerable EU citizens. The purpose of this thesis is to examine the right to housing and why vulnerable EU citizens cannot access the right. The issue is studied on three levels – human rights law, EU law and domestic Swedish
This master thesis was a project in cooperation with Höganäs AB. The aim was to increase the apparent density (AD) of two biomass chars, by three different agglomeration methods. The reason for the investigation is that biomass char could be used as a reducing agent in the sponge iron process at Höganäs AB. The goal was to exchange anthracite in the reduction mixture to agglomerated biomass char.
Thesis Purpose: This thesis investigates users of crowdfunding platforms in order to further the insight into understanding what affects their motives and behaviour. The relationship between intrinsic and extrinsic motivation as well as peer influence is investigated. Theoretical Perspective: This study is grounded on the limited theories surrounding crowdfunding and crowdsourcing, as well as rele
This thesis is about the licensing system of the Creative Commons discussed from the perspective of the theory of the commons mostly as formulated by Elinor Ostrom. The work is started by describing the concepts and theory of common pool resources and regime of the commons for production and distribution of these resources. The main characteristics for successful traditional commons – efficiency,
Populärvetenskaplig sammanfattning: Conodonterna var en framgångsrik och diversifierad marin djurgrupp som levde från ungefär mellankambrium (~ 500 Ma) till slutet av trias (200 Ma). Från ett fåtal bevarade avtryck vet man att djuren var långsmala, endast några cm långa och hade fenor. Avtrycken är svårtolkade, men mycket tyder på att conodonterna var förhållandevis avancerade och kanske till och Elements from the Ordovician conodont genus Protopanderodus Lindström, 1971 have been investigated to provide a model of reconstruction of the oral apparatus of this genus. In total, 4202 elements from the only five species representing Protopanderodus in the Swedish Middle Ordovician conodont fauna were included in the study. Four of the species, P. rectus, P. robustus, P. graeai and P. parvibasi
The proportion of meals the Europeans eat outside their home steadily increases. We take coffee breaks at work, eat lunch in the office canteen, we order take-away, we go to cafés or pubs to spend time with our friends, we easily grab a snack in vending machines and we eat on airplanes and trains to just mention a few examples. Eating out is nowadays more of an everyday activity than a luxury even
