Fakultet for naturvitenskap og teknologi: Nye registreringer

Viser treff 3941-3960 av 5327

    • Geomorfologisk analyse og skredkartlegging av Setså-området i Saltdal kommune, Nordland 

      Drage, Karianne (Master thesis; Mastergradsoppgave, 2017-05-14)
      Det norske fjord- og dallandskapet består høye fjell og bratte dalsider som er preget av skredaktivitet. Økende krav til framkommelighet langs vegnettet fører til at infrastrukturen er i stadig utvikling, og i mange tilfeller må vegbanen flyttes til mer skredsikre områder. Statens vegvesen er i gang med arbeidet for å flytte dagens Europaveg 6 gjennom Setså, Saltdal kommune, Nordland bort fra de ...

    • Pan genome and CRISPR analyses of the bacterial fish pathogen Moritella viscosa 

      Karlsen, Christian; Hjerde, Erik; Klemetsen, Terje; Willassen, Nils Peder (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-20)
      Background: Winter-ulcer Moritella viscosa infections continue to be a significant burden in Atlantic salmon (Salmo salar L.) farming. M. viscosa comprises two main clusters that differ in genetic variation and phenotypes including virulence. Horizontal gene transfer through acquisition and loss of mobile genetic elements (MGEs) is a major driving force of bacterial diversification. To gain insight ...

    • Geomorfologisk og strukturgeologisk undersøkelse av ustabile skråninger og skredavsetninger i fjellområdet mellom Tromsøysundet og Ullsfjorden i Tromsf 

      Grumstad, Andreas (Master thesis; Mastergradsoppgave, 2017-05-15)
      Fjellskred er den naturkatastrofen i landet som kan gi høyest konsekvenser, og Troms fylke har flere registrerte ustabile fjellsider enn noe annet sted i landet. Dette gjør også at mange skred og ustabile fjellsider kan studeres innenfor et relativt lite geografisk område. Hensikten med denne oppgaven er å finne sammenhenger i parameterer i berggrunn og topografi som er med å initiere bevegelse i ...

    • Integrated characterization of igneous intrusions in Central Spitsbergen 

      Festøy, Marte Hergot (Master thesis; Mastergradsoppgave, 2017-05-15)
      Igneous intrusions have a strong influence on petroleum systems, groundwater aquifers, and CO2 storage reservoirs, particularly because they can act as either barriers to, or carriers for fluid flow. This depends on several syn- and post emplacement processes, including fracture development in the intrusion and the host rocks, contact metamorphism of the host rocks, and hydrothermal activity. ...

    • Snow Stratigraphy Measurements With UWB Radar 

      Jenssen, Rolf-Ole Rydeng (Master thesis; Mastergradsoppgave, 2016-12-14)
      The focus of this thesis is to find and verify a non-invasive method to determine the layer distribution (stratigraphy) in snowpacks, which might aid avalanche risk assessment. Slab avalanches release due to failure and collapse in a weak snow layer. Determining the spatial distribution and depth of weak layers in avalanche starting zones is a high-risk task. Moreover, by manually digging snow ...

    • The volume distribution of artificial aurora induced by HF radio waves in the ionosphere 

      Kvammen, Andreas (Master thesis; Mastergradsoppgave, 2016-08-15)
      This thesis presents three-dimensional modelling of artificial aurora in the ionospheric F layer, induced by high frequency (HF) O-mode radio waves from the EISCAT heating facility. Understanding how HF radio waves produces enhanced emission in the ionosphere has been one of the one of the major motivations for conducting heating experiments during the last decades. A key element for understanding ...

    • System upgrade and data evaluation of the AIRIS riometer 

      Larsen, Ida Marie (Master thesis; Mastergradsoppgave, 2016-06-06)
      The focus of this thesis has been to investigate how to improve the AIRIS data. This has been done by first of all giving the riometer system an overhaul, checking the wiring and receivers as well as upgrading the riometer computer harddisk. As there has been a lot of issues occurring along the way, the focus finally went to pinpointing exactly what is causing the data quality to be poor and coming ...

    • The impact of Arctic late summer sea ice variability on mid-latitude autumn and winter weather. 

      Stoll, Patrick (Master thesis; Mastergradsoppgave, 2015-11-18)
      The influence of Arctic summer sea ice area on autumn and winter climate in the extra-tropic Northern hemisphere is investigated. During the last decades, the Arctic has warmed more than twice the global average rate, a phenomenon called the Arctic Amplification (AA). AA involves a remarkable decrease of the Arctic sea ice cover and a decrease of the latitudinal temperature gradient. Both are supposed ...

    • Numerisk modellering av absorberende randbetingelser for ultralydbølger i væsker og elastiske materialer 

      Grønmo, Tor Arne (Master thesis; Mastergradsoppgave, 2015-06-01)
      Simuleringer av utbredelse av ultralydbølger i elastiske polymerer og i væsker ble utført med et kommersielt simuleringsverktøy, COMSOL Multiphysics, basert på endelig element metode. Simuleringer ble utført i en- og to-dimensjoner. Undersøkelser ble utført for å finne ut ved hvilke oppløsninger av tid og rom ga stabile simuleringer. For en to-dimensjonal modell basert på en elastisk ...

    • Physical and statistical based decomposition of Polarimetric Synthetic Aperture Radar images of Arctic Sea ice 

      Arienzo, Alberto (Master thesis; Mastergradsoppgave, 2015-06-01)
      The studies about the climatic changes have always more underlined the importance of the climatic balance of the Arctic regions. For this reason the need of monitoring the Arctic becomes always more urgent. To measure the sea ice thickness, the sea ice cover, the motion of the glaciers and to discriminate the various kind of ice are only several of the challenges about the Arctic monitoring. But the ...

    • Joint ranking and clustering based on Markov Chain transition probabilities learned from data 

      Løkse, Sigurd (Master thesis; Mastergradsoppgave, 2014-12-15)
      The focus of this thesis is to develop a Markov Chain based framework for joint ranking and clustering of a dataset without the need for critical user-defined hyper-parameters. Joint ranking and clustering may be useful in several respects, and may give additional insight for the data analyst, as opposed to the traditional separate ranking and clustering procedures. By coupling Markov ...

    • Fluctuations in electron cyclotron resonance plasma in a divergent magnetic field 

      Bhattacharjee, Sudeep; Fredriksen, Åshild; Chandra, Sayan (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02)
      The dependence of fluctuations on electron-neutral collision frequency (V<sub>en</sub>) and the radial location is investigated in an electron cyclotron resonance plasma in a divergent magnetic field region for a set of magnetic fields. Results indicate that the fluctuations depend strongly on the collision frequency. At lower magnetic fields and V<sub>en</sub>, the fluctuation levels are small and ...

    • Thermal conditions and kinematics associated with final emplacement of the Lyngen nappe 

      Klæbo, Erik Vågå (Master thesis; Mastergradsoppgave, 2017-05-15)
      The tectonic boundary of between the Lyngen magmatic complex and the underlaying Nordmannvik have been examined for kinematic indicators. This boundary is characterised by an amphibole facies garnet-mica-kyanite gneiss overlain by a greenschist facies amphibolite/meta-gabbro succession separated by heavily foliated and lineated garnet-mica schist, phyllites and quartzites. Two main populations of ...

    • Microstructural changes during melt-assisted modification of quartzofeldspatic rocks. An example from the Eger Complex, North-Western Bohemian Massif 

      Hafne, Kristine (Master thesis; Mastergradsoppgave, 2017-05-15)
      The Eger Complex is situated in the Saxothuringian domain at the western margin of Bohemian Massif (Czech Republic). Migmatitic orthogneisses associated with granofelses and high-pressure felsic granulites make up the majority of the complex, which is interpreted as an upper crystalline nappe exhumed from underneath the fore-arc Teplá-Barrandian domain during the Variscan orogeny. Studies conducted ...

    • Drill cutting release in Ingøydjupet, SW Barents Sea from a well drilled in 1987, and its impact on benthic foraminifera 

      Berg, Julie (Master thesis; Mastergradsoppgave, 2017-05-15)
      In the nearby areas of the SW Barents Sea, large hydrocarbon reserves have been identified. During drilling procedures, drill cuttings are produced and some are released to sea. The disposal of drill cuttings may cause environmental degradation to the marine environment. Increasing petroleum activities, therefore requires further knowledge of ocean current transportation of fine sediment particles ...

    • Connection between chemical zonation and crystallographic preferred orientation as an indicator for the fabric development in eclogites. Example from the Saxothuringian eclogites, Bohemian massif, Czech Republic 

      Finstad, Ane Kongsro (Master thesis; Mastergradsoppgave, 2017-05-15)
      The presence of eclogites is one of the strongest evidences for high pressure metamorphism, and for the presence of a paleo subduction zone. Deformation of eclogites can yield important information about the kinematics of subduction zones. The main mechanism for fabric development in eclogites is still a matter of debate among various research groups and has split the field in two. Most previous ...

    • Shallow gas accumulations and fluid flow in the vicinity of the Goliat field, SW Barents Sea 

      Paulsen, Renate Strugstad (Master thesis; Mastergradsoppgave, 2017-05-15)
      This thesis focuses on the Goliat area located in the Hammerfest Basin, SW Barents Sea. The overall aim of this study is to increase the understanding of fluid flow processes between deeper thermogenic sources, and shallow gas accumulations. Indications of an active fluid flow system has been observed throughout the southwestern Barents Sea. Much of the fluid flow from deep hydrocarbon reservoirs ...

    • Installation and characterization of an electron bombardment ion source for a Space Simulation Chamber (SSC) 

      Dyrland, Karianne (Master thesis; Mastergradsoppgave, 2016-12-15)
      The primary focus of this thesis is the installation and characterization of an electron bombardment ion source for a Space Simulation Chamber (SSC). The goal is that the chamber can be used to test satellite and sounding rocket instrumentation, thus be capable of producing ionospheric plasma conditions, along with an ion beam that can simulate the velocity of a rocket or satellite relative to the ...

    • Shallow stratigraphic cores NW of Bjørnøya, results and implications 

      Eikelmann, Isak Emil Skadsem (Master thesis; Mastergradsoppgave, 2017-05-15)
      Two shallow boreholes, 7418/01-U-01 and 7517/12-U-01, were in 1994 drilled by IKU / SINTEF on behalf of the Norwegian Petroleum Directorate (NPD) northwest of Bjørnøya in the western Barents Sea. These were part of a program totalling nine boreholes at six different locations between Bjørnøya and Svalbard. This area is not opened for petroleum activity, and the shallow boreholes were aimed at ...

    • 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 ...