• Analyzing the Impact of Peak-Shaving on Load Reduction and on Battery Energy Storage System Degradation: A Simulation-Based Study in Husøy 

      Kournoutis, Georgios (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 ...
    • Angle Dependent Reflectance and Performance of Solar Cells and Absorbers 

      Jordheim, Øystein (Master thesis; Mastergradsoppgave, 2018-05-14)
      In this thesis, the reflectance was measured for angles from 10 deg to 80 deg for different n-type silicon based solar cells and for solar absorbers. The measurements were done with unpolarized, p polarized and s polarized light. The reflectance results show that both the solar cells and solar absorbers perform well under small variation from perpendicular angle well but as the angle of incidence ...
    • Application of quantitative phase microscopy in microbiology for label-free imaging of bacteria 

      Abrar, Attiqa (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 ...
    • Backpropagation Neural Networks for Facial Recognition 

      Solheim, Inger (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 ...
    • Baneberegninger for støv rundt Sola, Vega og Fomalhaut 

      Stamm, Johann Immanuel (Master thesis; Mastergradsoppgave, 2018-05-14)
      Observasjoner av Vega og Fomalhaut tyder på at de har støvbelter rundt seg. Avstanden fra stjerna er rundt 0,2 astronomiske enheter (AE) og størrelsen til støvpartiklene varierer fra noen nanometer til noen mikrometer. Slikt støv fins også i solsystemet. Denne oppgaven handler om å beregne banen til slike støvpartikler etter danning. Det antas at støvet påvirkes av tre krefter: gravitasjon, ...
    • Chip Based Optical Nanoscopy: System Integration and Automation 

      Hansen, Daniel Henry (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 ...
    • Coded Signals for High Frequency Ultrasound Imaging 

      Peng, Chengxiang (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. ...
    • A comparative study of algorithms for blind source separation in the instantaneous linear mixture model 

      Thon, Kevin (Master thesis; Mastergradsoppgave, 2007-06-22)
      This thesis discusses some of the many techniques for performing blind source separation. Its focus is on the theoretical concepts that allow for the problem to be solved. It starts with presenting the EM algorithm, which is the method underpinning many of the algorithms that are presented later in the thesis. Some of the established methods are presented, and we proceed to devolop source separation ...
    • A comparative study of lens-less and lens-based optical imaging using full electric field analysis 

      Sommernes, Jon-Richard (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 ...
    • A comparison between optical and SAR classification results for thin sea ice in Storfjorden 

      Quigley, Cornelius (Master thesis; Mastergradsoppgave, 2017-05-31)
      According to the scientific consensus, the Arctic is currently in a state of unprecedented change. In recent years, climate change has been identified as the main cause of Arctic sea ice decline. For this reason, the need to have access to timely and cost effective data is of great importance. Remote sensing via Earth orbiting satellites offers extensive data coverage in areas that are typically ...
    • Conditional averaging of overlapping pulses 

      Nilsen, Rolf Annar Berg (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 ...
    • Detecting EV Charging From Hourly Smart Meter Data 

      Barkost, Per Harald (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 ...
    • Detecting Unhealthy Comments in Norwegian using BERT 

      Warholm, Joakim (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 ...
    • A detection theoretical approach to digital communications using autoregressive process shift keying 

      Anfinsen, Stian Normann (Master thesis; Mastergradsoppgave, 2001-03-10)
      I klassisk digital kommunikasjon overføres en bitstrøm gjennom en kanal ved å modulere parametrene til en deterministisk bærebølge. Noen kjente eksempler er amplitudemodulasjon (AM), frekvensmodulasjon (FM) og fasemodulasjon (PM). Mottakeren estimerer parametrene til det informasjonsbærende signalet og bruker en deteksjonsregel til å klassifisere den mottatte bølgeformen som en av flere mulige ...
    • Drift wave turbulence and zonal flows 

      Meyer, Ole Hauke Heinz (Master thesis; Mastergradsoppgave, 2012-11-15)
      Anomalously large radial transport levels in fusion devices is commonly believed to be the cause of small-scale edge localized electrostatic drift wave turbulence. We review the basic drift wave instability mechanism and show how poloidally elongated structures can self-consistently emerge from the small-scale turbulent motions through envelope modulation governed by the cubic nonlinear ...
    • Effect of permanent magnets on plasma confinement and ion beam generation in a double layer helicon plasma source 

      Varberg, Erik (Master thesis; Mastergradsoppgave, 2016-06-01)
      The work described in this thesis was carried out to investigate how additional permanent magnets (PM) could affect the confinement and ion beam generation in a plasma which expands from a helicon source. PMs added to a plasma source systems has been shown to provide an increased plasma confinement, but is not widely used. This inexpensive and cheap method of using PMs which does not require any ...
    • Effects of subglacial meltwater runoff on the ocean circulation beneath the Filchner Ice Shelf 

      Hus, Johanne Jahnsen (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 ...
    • The effects of time-variation of electron fluxes from the auroral ionosphere on M-I coupling 

      Gavazzi, Etienne (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 ...
    • Estimation of Neutral Densities in the Thermosphere 

      Stock, Will (Master thesis; Mastergradsoppgave, 2017-05-17)
      Ionospheric energy balance is studied with incoherent scatter radar measurements that allow the estimation of neutral density and temperature from a statistical inversion problem. This method has been successfully studied at low latitudes using data over several years to make a robust model. This has not been done within the high latitude auroral regions and there are many factors that can complicate ...
    • Evaluating Deep Q-Learning Techniques for Controlling Type 1 Diabetes 

      Hjerde, Sigurd Thorvald Nordtveit (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 ...