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Analyzing the Impact of Peak-Shaving on Load Reduction and on Battery Energy Storage System Degradation: A Simulation-Based Study in Husøy
(Mastergradsoppgave; Master thesis, 2023-11-14)The island of Husøy, in Northern Senja, Norway, faces numerous voltage quality difficulties, which arise from the consequent surge in electricity demand by the local growing fishing industry. Collaborating with the local distribution system operator (DSO), Arva, the current study explores the implementation of Battery Energy Storage Systems (BESS) using a peak-shaving strategy to alleviate high-demand ... -
Effects of subglacial meltwater runoff on the ocean circulation beneath the Filchner Ice Shelf
(Mastergradsoppgave; Master thesis, 2023-06-15)Antarctic ice shelves, by restraining ice streams and affecting the discharge of grounded ice, play a critical role in the mass balance of the Antarctic ice sheet. In this study, sub-ice shelf CTD measurements and time series data from an ice shelf cavity mooring were used to detect subglacial runoff beneath the Filchner Ice Shelf. CTD measurements from four boreholes across the southern Filchner ... -
On the Linkage Between Rossby Waves and Heatwaves
(Mastergradsoppgave; Master thesis, 2023-05-14)This thesis examines the relationship between upper-level atmospheric circulation and heatwaves. We studied the role of planetary Rossby waves in the observed increase in intensity, frequency, and duration of extreme temperature events in the mid-latitudes. Focusing on the summer season, we tested the proposed hypothesis that links recent changes in the Rossby wave amplitudes and propagation speed ... -
Oceanographic variability and change in two fjords in northern Norway
(Mastergradsoppgave; Master thesis, 2023-06-01)Long-term hydrographic time series data from two fixed stations in the northern Norwegian fjords Malangen and Balsfjorden from the period 1980 - 2022 have been examined. The data have been supplemented with model results from the ocean model NorFjords160 over the period April 1st 2017 to December 31st 2022. To gain a deeper understanding of the oceanographic variability and change, the environmental ... -
Conditional averaging of overlapping pulses
(Mastergradsoppgave; Master thesis, 2023-05-15)Conditional averaging is a signal processing method used to study turbulent fluctuations in a variety of fields. The method, in its simplest form, works by finding peaks in a signal that fulfill a certain size threshold. Equally sized excerpts of the signal around every peak are then cut out and averaged. This yields the average shape of the events that fulfill the condition. Based on the peak ... -
A comparative study of lens-less and lens-based optical imaging using full electric field analysis
(Mastergradsoppgave; Master thesis, 2021-05-13)The focus of this thesis is to investigate the feasibility of a lens-less label-free microscope system, and compare this with a conventional lens-based microscope. The imaging performance of conventional microscopes are greatly dependent on the objective lens, due to their inherent physical space constraint and spherical aberrations. We, therefore, will investigate the conceptual feasibility of a ... -
Raman-spectroscopy and of optically trapped nanoparticles
(Mastergradsoppgave; Master thesis, 2022-11-06)The present work begins a large layer of experiments on the study of Raman radiation from extracellular vesicles. It is a promising method that provides unique information about the global biomolecular composition of a single vesicle or a small number of vesicles. Two physical phenomena are present in this work, Raman scattering and optical trapping. In Raman scattering, the scattered radiation ... -
The effects of time-variation of electron fluxes from the auroral ionosphere on M-I coupling
(Master thesis; Mastergradsoppgave, 2022-05-15)Electric potential-differences between the magnetospheric and the ionospheric end of a magnetic flux tube lead to the downward acceleration of electrons in the ionosphere, producing visible auroral arcs. Most of the potential-drop is situated in a narrow altitude-region known as double layer. In the ionosphere, the precipitation of high-energy electrons will produce secondary electrons. Some ... -
Stochastic Modelling and Numerical Simulations of Radial Filament Motion and Average Profiles at the Boundary of Fusion Plasmas
(Master thesis; Mastergradsoppgave, 2022-05-15)<p>The boundary region of magnetically confined plasmas is well known to have inherently fluctuating parameters. Advances in experimental measurements and numerical computations have revealed that the fluctuation-driven transport of particles and heat across the magnetic field lines is mainly dominated by the radial motion of blob-like filament structures. These structures, which are localized in ... -
Numerical Simulations of Turbulence at the Boundary of Fusion Plasma
(Mastergradsoppgave; Master thesis, 2022-05-15)Numerical simulations of reduced fluid models describing magnetized plasmas have previously been used to study the boundary of fusion plasmas extensively. A common approximation applied to these models is the so-called Boussinesq approximation. One of the requirements for the Boussinesq approximation to be applicable is that the background particle density is significantly higher than the fluctuations ... -
Application of quantitative phase microscopy in microbiology for label-free imaging of bacteria
(Master thesis; Mastergradsoppgave, 2022-03-15)Bacteria are the planet’s oldest and the most common life forms. Bacteria have developed alongside humans and are good and harmful to our health. Our bodies contain nearly ten times the number of bacteria as human cells, and this natural microbiota is critical for appropriate development, nutrition, and disease resistance. Unfortunately, we live in an environment rich with bacteria that may cause ... -
Planetary auroral imaging
(Mastergradsoppgave; Master thesis, 2021-07-09)The interaction of the solar wind and the Earth magnetosphere cause auroras. The energetic electrically charged particles, mostly electrons, accelerate along the Earth magnetic field lines into the upper atmosphere, where they collide with gas atoms, causing them to emit light. Some planets also have auroral emission in their characteristic environment. The Jovian magnetosphere is the largest ... -
Towards Unsupervised Domain Adaptation for Diabetic Retinopathy Detection in the Tromsø Eye Study
(Mastergradsoppgave; Master thesis, 2021-05-29)Diabetic retinopathy (DR) is an eye disease which affects a third of the diabetic population. It is a preventable disease, but requires early detection for efficient treatment. While there has been increasing interest in applying deep learning techniques for DR detection in order to aid practitioners make more accurate diagnosis, these efforts are mainly focused on datasets that have been collected ... -
Detecting Unhealthy Comments in Norwegian using BERT
(Mastergradsoppgave; Master thesis, 2021-05-28)In this work we present a new Norwegian labeled dataset of 7078 comments for unhealthy comment detection. The dataset is used to fine-tune a BERT model, and demonstrates that BERT has the ability to detect subtle forms of toxicity, also in Norwegian. We compare how the different newly released Norwegian BERT models perform when fine-tuned on our dataset, and we also experiment with how English data ... -
Chip Based Optical Nanoscopy: System Integration and Automation
(Mastergradsoppgave; Master thesis, 2019-05-15)An integrated photonic chip based nanoscopy system has previously been developed at UiT, which allows for several advantages over conventional total internal reflection fluorescence microscopy and nanoscopy (i.e. super-resolutionnanoscopy). While the proof-of-concept has been demonstrated, there were several important system optimization tasks that were needed for making the ... -
Detecting EV Charging From Hourly Smart Meter Data
(Master thesis; Mastergradsoppgave, 2020-05-15)Detecting electrical vehicle (EV) charging from smart meter data (EV detection) is a highly relevant problem for the distribution system operators (DSOs), especially with the expected growth of EVs worldwide. There are several reasons why DSOs may want to detect EV charging. In the present day, the main motivation is to reduce the total load on the grid in high demand periods. This can be achieved ... -
Evaluating Deep Q-Learning Techniques for Controlling Type 1 Diabetes
(Master thesis; Mastergradsoppgave, 2020-02-13)Patients with type 1 diabetes (T1D) must continually decide how much insulin to inject before each meal to maintain an acceptable level of blood glucose. Recent research has worked on a solution for this burden: the artificial pancreas (AP), which is a closed-loop system combining a continuous glucose monitor (CGM) and an insulin pump with a decision-making algorithm. The goal of this thesis is ... -
Backpropagation Neural Networks for Facial Recognition
(Master thesis; Mastergradsoppgave, 1991-12)A survey was conducted testing the aptitude of neural networks to recognize human faces. The motivation for this a study is the possibility of designing automatic security systems. Pictures of 511 subjects were collected. The pictures captured both profiles and many natural expressions of the subject. Some of the subjects were wearing glasses, sunglasses or hats in some of the pictures. The images ... -
Coded Signals for High Frequency Ultrasound Imaging
(Master thesis; Mastergradsoppgave, 2019-05-30)Degeneration of articular cartilage is known as a serious and painful knee disease seriously affecting people in all ages. The disease also marks the presence of osteoarthritis which is a complex musculoskeletal disorder. A successful assessment of the degeneration status is of great importance for estimating osteoarthritis progression, and thereby beneficial for implementing clinical treatments. ... -
Thermal analysis of PTC heaters. Thermography of PTC and Peltier heaters. Labview® based control and Matlab® Simulink simulations of PTC heaters.
(Master thesis; Mastergradsoppgave, 2018-06-15)A large variety of heating devices are being used in the industry. Two widely used smart heating devices are discussed in this study. These heating devices are Peltier/thermoelectric (TE) and Positive Temperature Coefficient (PTC) resistive heater. This study provides detailed experimentation of PTC heater and Peltier device at room conditions and cold environment. The thermal response of both ...
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