Now showing items 3088-3107 of 4765

    • Optical Waveguides for Infrared Spectroscopic Detection of Molecular Gases 

      Vlk, Marek (Doctoral thesis; Doktorgradsavhandling, 2021-06-18)
      Fields like medical diagnostics, urban and industrial environmental monitoring or basic microbiological research greatly benefit from advances in chemical and biological sensing. These applications require rapid sample analysis, reduced needs for sample handling, or good sensor network. Such demands can be met with miniaturised sensors utilising methods which secure sufficient sensitivity and ...
    • OptiJ: Open-source optical projection tomography of large organ samples 

      Vallejo Ramirez, Pedro P.; Zammit, Joseph; Vanderpoorten, Oliver; Fergus, Riche; Blé, Francois-Xavier; Zhou, Xiao-Hong; Spiridon, Bogdan; Valentine, Christopher; Spasov, Simeon E.; Oluwasanya, Pelumi W.; Goodfellow, Gemma; Fantham, Marcus J.; Siddiqui, Omid; Alimagham, Farah; Robbins, Miranda; Stretton, Andrew; Simatos, Dimitrios; Hadeler, Oliver; Rees, Eric J.; Ströhl, Florian; Laine, Romain F.; Kaminski, Clemens F. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-30)
      The three-dimensional imaging of mesoscopic samples with Optical Projection Tomography (OPT) has become a powerful tool for biomedical phenotyping studies. OPT uses visible light to visualize the 3D morphology of large transparent samples. To enable a wider application of OPT, we present OptiJ, a low-cost, fully open-source OPT system capable of imaging large transparent specimens up to 13 mm tall ...
    • An Optimal Decision-Tree Design Strategy and Its Application to Sea Ice Classification from SAR Imagery 

      Lohse, Johannes; Doulgeris, Anthony Paul; Dierking, Wolfgang Fritz Otto (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-03)
      We introduce the fully automatic design of a numerically optimized decision-tree algorithm and demonstrate its application to sea ice classification from SAR data. In the decision tree, an initial multi-class classification problem is split up into a sequence of binary problems. Each branch of the tree separates one single class from all other remaining classes, using a class-specific selected feature ...
    • Optimal Ordering Strategy of Perishable Products 

      Bjørvik, Simon Sagelv (Master thesis; Mastergradsoppgave, 2016-07-13)
      It is challenging to plan for the future, especially if there are uncertainties. In the retail store business making the right orders at the right time might have a severe impact on the profit of the store. Maintaining the right inventory is a part of this. With fluctuations in price and competition, having the best deals, and being at the whims of the customers making sure that the store has the ...
    • Optimal sizing and placement of Electrical Vehicle charging stations to serve Battery Electric Trucks 

      Isaksen, Ole-André (Master thesis; Mastergradsoppgave, 2023-06-01)
      For Norway to reach the emission limits in the Paris Agreement, a substantial amount of CO2 must be reduced. Road traffic alone accounts for a high percentage of the total emissions during 2021. This thesis will focus on electrifying the transport sector and analyzing charging infrastructure for heavy-duty electric vehicles. New charging infrastructure for heavy-duty Electric Vehicles (EVs) provides ...
    • An optimised method for electrodialytic removal of heavy metals from harbour sediments 

      Pedersen, Kristine Bondo; Jensen, Pernille E.; Ottosen, Lisbeth M.; Lejon, Tore (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-08-10)
      A 2-compartment electrodialytic cell set-up for treatment of solid materials has in many respects proven superior to other types of cells in removing heavy metals from sediments. Most notably, remediation times were shorter, energy consumption was lower and higher removal efficiencies were observed. By employing multivariate modelling and investigating additional experimental variables, the ...
    • Optimising the use of marine tephrochronology in the North Atlantic: a detailed investigation of the Faroe Marine Ash Zones II, III and IV 

      Griggs, Adam J.; Davies, Siwan M.; Abbott, Peter M.; Rasmussen, Tine Lander; Palmer, A. P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • Optimization of a polymer layer highly doped with Cryptophane-A for methane sensing 

      Yadav, Mukesh (Master thesis; Mastergradsoppgave, 2017-05-15)
      The main objective of this thesis is to optimize the thickness of sensitive polymer layer highly doped with Cryptophane-A for methane pre-concentration and to make the existing sensor more stable and selective towards methane. In recent years, methane detection has become a hot topic due to the strong impact of methane on the global warming and the climate change. There has also been rising ...
    • Optimization of maritime operations in Arctic. Rating of improvement of weather routing/decision support systems for maritime operations in the Arctic region 

      Johansen, Kåre (Master thesis; Mastergradsoppgave, 2013-05-15)
      Abstract The decreased ice extent caused by increased air and sea temperatures has led to a growing interest in the Arctic waters. There are different maritime industries that have plans to expand northwards for various reasons. First of all there are different developments in oil and gas industry in Barents, Kara, Greenland, Arctic sea around the coast of Canada and Alaska. New ship trading ...
    • Optimization of Pure-Component LNG Cascade Processes with Heat Integration 

      Eiksund, Oddmar; Brodal, Eivind; Jackson, Steven (Journal article; Tidsskriftartikkel, 2018-01-15)
      Liquefaction of natural gas is an energy-intensive process in which the energy efficiency depends on the number of compressors stages and the heat integration scheme. The aim of the study is to systematically evaluate process performance of pure component cascade processes, present optimized designs for all relevant numbers of compression stages and compare energy consumption between processes with ...
    • Optimization of wind turbine location in urban environment 

      Hågbo, Trond-Ola (Master thesis; Mastergradsoppgave, 2017-06-01)
      Making energy clean, reliable and readily available is essential for fighting climate change and to supply an ever-rising global power demand. The aim of the study is to identify optimal locations for a wind turbine to be joined to a small-scale hybrid system at the main campus of UiT – The Arctic University of Norway. To identify feasible areas for maximizing electric power production, techniques ...
    • Optisk resonans i mikrokuler av glass med høy brytningsindeks 

      Husabø, Bjarne Janson (Master thesis; Mastergradsoppgave, 2009-06-15)
      I denne oppgaven har vi sett på effekten av lys som kobles fra en bølgeleder inn i optiske mikrokuler av høyindeksglass. Vi har studert Q-faktorer, og funnet at disse er lavere for kuler omgitt av vann enn tørre kuler, men at forskjellen er mindre enn mellom individuelle kuler. Vi har observert høyere ordens resonanser i kuler med større diameter. Vi har også forsøkt å utnytte resonans til å flytte ...
    • Optiske bølgeledere av silisium-rik nitrid for manipulering av mikro- og nanopartikler 

      Nermo, Thomas (Master thesis; Mastergradsoppgave, 2007-06-01)
      Målet med denne oppgaven er å karakterisere bølgeledere av silisium-rik nitrid, SiRN, med hensyn på koblingstap, propagasjonstap, tall på modi og feltfordeling. Det skal gjøres forsøk på å redusere tapet mest mulig ved å prøve ut forskjellige måter å koble inn lys og forbedre kuttingen av bølgelederene. Det skal også gjøres forsøk på å finne tykkelse og brytningsindeks på bølgelederene ved hjelp av ...
    • Ore petrography and fluid evolution in the Cu-(Zn) VMS deposits at Sulitjelma, Northern Norway 

      Birkeland, Andre (Master thesis; Mastergradsoppgave, 2018-05-29)
      The Sulitjelma deposits, Nordland, Northern Norway, with more than 20 Zn-Cu ore bodies (total tonnage excesses 35 Mt of ore at 1.84 % Cu, 0.86 % Zn, 10 g/t Ag and 0.25 g/t Au) have been described as a classic example of the Zn-Cu volcanogenic massive sulfide (VMS) mineralization. The mineralization is spatially associated with metamorphosed mafic rocks of Ordovician age. Both, ore bodies and their ...
    • Organic Matter Sources in North Atlantic Fjord Sediments 

      Faust, Johan Christoph; Knies, Jochen (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-31)
      To better constrain the global carbon cycle fundamental knowledge of the role of carbon cycling on continental margins is crucial. Fjords are particularly important shelf areas for carbon burial due to relatively high sedimentation rates and high organic matter fluxes. As terrigenous organic matter is more resistant to remineralization than marine organic matter, a comprehensive knowledge of the ...
    • Organisatorisk læring i en responsorganisasjon. En studie av å dele og lagre erfaringer ved hovedredningssentralen i Bodø 

      Ebbang, Christopher (Master thesis; Mastergradsoppgave, 2017-07-13)
      Denne oppgaven undersøker hvordan organisatorisk læring kan fremmes i en responsorganisasjon. Oppgaven har som utgangspunkt at læring fra erfaringer bidrar til å forklare hvordan redningsledere lærer (Sommer & Njå, 2012), og at en forståelse av individuell læring er nødvendig for å forstå hvordan organisasjoner lærer (Dixon, 1999). Sammen med en overlapp i betydningen dele og lagre erfaringer har ...
    • Organisatorisk resiliens i ambulansetjenesten - En casestudie om hvordan risikostyring kan påvirke organisatorisk resiliens 

      Hunstad, Erlend With (Master thesis; Mastergradsoppgave, 2020-12-06)
      Dagens samfunn stiller store krav til organisasjoner og deres risikohåndtering. Med en økende grad av globalisering i verdenssamfunnet og med større usikkerhet, blir det stadig mer utfordrende å håndtere uønskede hendelser. Risikostyring og organisatorisk resiliens er derfor viktig for en organisasjon å kunne beherske og utvise for å unngå at uønskede hendelser fører til tap av liv, økonomi, materiell, ...
    • Organization of the magnetosphere during substorms 

      Zivkovic, Tatjana; Rypdal, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      The change in degree of organization of the magnetosphere during substorms is investigated by analyzing various geomagnetic indices, as well as interplanetary magnetic field z-component and solar wind velocity x-component. We conclude that the magnetosphere self-organizes globally during substorms, but neither the magnetosphere nor the solar wind become more predictable in the course of a substorm. ...
    • Organometallic Chemistry for Enabling Carbon Dioxide Utilization 

      Hazari, Nilay; Iwasawa, Nobuharu; Hopmann, Kathrin Helen (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-11)
      <p>In photosynthesis, carbon dioxide is used as the carbon source; indeed, most carbon atoms in the structure of a massive tree—the trunk, the branches, the leaves—originate from CO2. This insight has profound implications for chemical synthesis: complex molecular structures are built from something as simple and inert as CO<sub>2</sub>. Scientists have long been fascinated by this concept, and ...
    • 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 ...