Now showing items 101-120 of 133

    • RAM analysis of mining equipment and framework for data collection 

      Sneve, Terje (Master thesis; Mastergradsoppgave, 2015-06-01)
      In the mining industry, equipment are continuously increasing in size and complexity. At the same time, the demand for available plants and continuous production has never been higher. The performance of equipment depends on the reliability and maintainability performance of the equipment along with the maintenance supportability, operational conditions, and environmental conditions. In order to ...
    • A detailed investigation of a geological CO2-storage reservoir 

      Hatland, Anna Maria (Master thesis; Mastergradsoppgave, 2015-05-31)
      Increased CO2-concentrations within the atmosphere of the Earth have encouraged development of “carbon capture and storage” (CCS). It is important to avoid global warming, and CO2 may be stored within geological formations in the subsurface. This thesis focuses on the possibilities of storing CO2 in a reservoir of Middle Triassic-Middle Jurassic age in The Nordkapp Basin, The Southern Barents ...
    • Evaluation of probability of failure of static equipment in pressurized mud systems on an offshore drilling installation 

      Rød, Bjarte (Master thesis; Mastergradsoppgave, 2015-06-01)
      Degradation of pressurized topside static mud equipment is a very complex process. Inspection is a helpful tool to monitor degradation and helps reduce the number of critical failures. If it is left undetected and unchecked, it can lead to leakage resulting in accidents. To set up an effective inspection program, the concepts of Risk-Based Inspection (RBI) can be utilized. RBI helps to develop an ...
    • A study of the potential improvement of Sydvaranger Gruve´s process water treatment through experiments with different flocculants and coagulants 

      Floer, Ida Katrine (Master thesis; Mastergradsoppgave, 2015-06-01)
      Mining is the process or industry of extracting valuable minerals or other geological materials from the earth. The nature of mining creates a potential negative impact on the environment both during the mining operations and several years after the mine is closed. Over the years regulations designed to moderate the negative effects are adopted, and environmental issues and challenges have ...
    • QRA techniques on dynamic positioning systems during drilling operations in the Arctic: With emphasis on the dynamic positioning operator 

      Pedersen, Runar Nikolai (Master thesis; Mastergradsoppgave, 2015-06-01)
      With the Norwegian government moving the ice edge farther north than ever before, opening for new areas for petroleum exploration, it will need research on how these areas can affect oil and gas operations. A sensitive environment along with the harsh Arctic climate and remote distances means that severe accidents, like blowouts, will have serious impacts and make cleanup and rescue actions to ...
    • Risk analysis of well control operations considering Arctic environmental conditions 

      Bergan, Håvard Hegg (Master thesis; Mastergradsoppgave, 2015-06-01)
      Oil and gas development in the Arctic is becoming a major focus in the industry today. However, compared to other regions, there is less experience regarding drilling operations in the Arctic environment. This fact raises concerns about high-risk scenarios, which might take place because of the harsh environmental conditions and the effects they have on various phases of operations, equipment and ...
    • Fast estimation of ocean background reflectivity in synthetic aperture radar images 

      Nylehn, Tina Eliassen (Master thesis; Mastergradsoppgave, 2015-06-02)
      Several ship detection algorithms have been developed over the years, where some of the most commonly used are the constant false alarm rate (CFAR) algorithms. There are challenges to the existing algorithms, both when it comes to processing time and difficult scene situations, such as heterogeneous ocean clutter and multiple targets. Existing algorithms that are equipped to handle situations ...
    • Ship detection products based on complex SAR data in TOPS mode 

      Myrnes, Marianne (Master thesis; Mastergradsoppgave, 2015-06-01)
      With the increasing need for monitoring ship traffic in both coastal and open oceans, ship detection is an important application of synthetic aperture radar (SAR). This thesis investigates image products suitable for ship detection for complex data acquired in Terrain Observation by Progressive Scans (TOPS) mode. The research was based on studying how contrast enhancement algorithms suitable for SLC ...
    • The nature of the gas-hydrate/free gas transition zone at the base of the hydrate-stability zone from high-resolution 3D seismic data 

      Bjørnøy, Kirsti (Master thesis; Mastergradsoppgave, 2015-01-26)
      Geophysical evidence of a prominent BSR at Vestnesa Ridge and north to the northern flank of the Storegga slide escarpment infer that gas hydrates are ubiquitous within these regions. A wide range of fluid flow structures have previously been discovered from these regions, as well as gas seepage activity from pockmarks on the eastern segment of Vestnesa Ridge. This paper focuses on high-resolution ...
    • Short-term wind power prediction based on Markov chain and numerical weather prediction models: A case study of Fakken wind farm 

      Jacobsen, Morten (Master thesis; Mastergradsoppgave, 2014-06-02)
      Rising energy demands and a growing focus on sustainable development have made electricity production from wind energy an attractive alternative to fossil fuels. However the natural variability of wind makes it challenging to implement wind energy into the electrical grid. Accurate and reliable wind power predictions are seen as a key element for an increased penetration of wind energy. This ...
    • Thermal energy recycling at Elkem Salten Verk 

      Rundhaug, Erik Ro (Master thesis; Mastergradsoppgave, 2014-06-01)
      This thesis elucidates thermal energy transfer at Elkem Salten Verk, and tries to determine the most favorable approach on how to provide indoor heating by thermal energy for a building at the plant site. My goal for this thesis was to create some suggestions, regarding the type of heating systems and their energy rates in order to provide enough heating power for Miljøbygget.
    • "Numerical modeling of microwave interactions with sea ice" 

      Kampffmeyer, Michael Christian (Master thesis; Mastergradsoppgave, 2014-06-02)
      Remote sensing is a key instrument for monitoring sea ice surface properties over large areas. Synthetic Aperture Radar (SAR) as well as Real Aperture Radar (RAR) are two types of radars that are extensively used in this context and measure the backscatter of the surface that they illuminate. Backscattering of waves from rough surfaces is complicated and depends, among other things, on the roughness ...
    • Undersjøiske skred i Balsfjorden, Nord-Norge: egenskaper og sammensetning 

      Iversen, Vera (Master thesis; Mastergradsoppgave, 2014-06-02)
      Batymetridata, høyoppløselige seismisk data samt en sedimentkjerne fra indre Balsfjorden, Troms, nord-Norge, har blitt analysert for å undersøke sedimentasjonsprosesser i løpet av Holocen, med spesiell fokus på undersjøiske rasavsetninger. Hovedvekt av denne oppgaven ligger på analyse av den 8,67 m lange sedimentkjernen JM11-001-PC. Dette inkluderte beskrivelse av sedimentoverflate og røntgen ...
    • Detection of avalanche debris fields in high resolution SAR imagery 

      Vognild, Erlend (Master thesis; Mastergradsoppgave, 2014-06-02)
      During the winter of 2013, Northern Norway saw several large avalanche episodes that caused closed roads and loss of human lives. On Senja and Kval\o ya two large avalanches were reported and images from RADARSAT-2 were ordered in ultrafine mode with the goal of detecting these large avalanches in SAR images. Later that year another two images were ordered from RADARSAT-2 that were be used as reference ...
    • Ocean modeling in Northern Norway: A tidal verification study 

      Djuve, Hans Kristian (Master thesis; Mastergradsoppgave, 2014-06-02)
      The coast of Northern Norway has for the first time been modeled using an unstructured grid. The modeling is done using two separate grids of different resolution, and the model data is compared to measurements done along the coast to verify its performance for both the fine and coarse grid. The model is a 2-D depth integrated model of tidal circulation with bottom friction. The data have been ...
    • Focused fluid flow through the gas-hydrate stability zone on the Vestnesa Ridge, offshore W-svalbard 

      Aas, Cecilie (Master thesis; Mastergradsoppgave, 2014-07-17)
      Abstract: Numerous unburied seafloor pockmarks are related to current methane-leakage at Vestnesa Ridge (~79° N), west of Svalbard. About 50 km long and 1-3 km wide, Vestnesa Ridge is a 1-2 km thick sediment drift to the north of the active Molloy transform – on the eastern spreading segment. With its crest at 1200-1300 m depth, the ridge is located on young (<19.6 Ma) oceanic crust. The entire ...
    • Polar low trajectories in the Nordic Seas 1999-2013: a statistical analysis using kernel density methods 

      Kvammen, Ylva Kirsten (Master thesis; Mastergradsoppgave, 2014-06-02)
      Polar lows are mesoscale cyclones of high intensity, frequently occurring in the Nordic Seas during the winter season. They usually form in baroclinic zones, for instance in regions near ice edges, and they are often maintained by organized convection. Polar lows are characterized by severe weather conditions like heavy snowfall, strong winds, icing and large sea waves. In addition to forecasting ...
    • Origin and accumulation mechanism of shallow gas accumulations in the SW Barents Sea 

      Kjerkreit, Kristian (Master thesis; Mastergradsoppgave, 2014-06-02)
      Events associated with shallow gas accumulations are reported all over the Norwegian continental shelf. These accumulations are potentially dangerous geo-hazards related to drilling activity, but they can also be of economic interest if the accumulated volumes are large. Petroleum in the Barents Sea has been influenced by the late periods of uplift and erosion creating a complex province. The exact ...
    • Time-lapse seismic interpretation of injected CO2 plume at the Sleipner Field, North Sea 

      Valberg, Espen (Master thesis; Mastergradsoppgave, 2014-06-02)
      One of the methods to cope with the increase of emitted greenhouse gases has been to capture CO2 gas from a point source and storing it within the Earths subsurface; “Carbon Capture and Storage” (CCS). Since 1996, Statoil and its partners have injected CO2 into a saline aquifer called the Utsira formation located in the North Sea. About 0.9Mt of CO2 is injected into the formation yearly, with a ...
    • Power potential of Rystraumen, Norway 

      Solbakken, Kine (Master thesis; Mastergradsoppgave, 2014-03-14)
      The maximum power potential of the tidal current Rystraumen close to Troms , Norway, is assessed both theoretically and from a depth-integrated numerical model (FVCOM). For the theoretical estimate of the maximum power potential, the topography is simplified to the situation in which the channel connects a large basin, unaffected by the energy extraction, to a closed bay. A set of governing equations ...