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norskFakultet for naturvitenskap og teknologi: Nye registreringer
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Geomorfologisk undersøkelse av skredvifter i Indre Kjosen, Lyngen, Troms, med fokus på snøskredavsetninger
(Master thesis; Mastergradsoppgave, 2017-05-16)Skred er et utbredt faremoment i Troms og utgjør en overhengende trussel for bebyggelse så vel som for infrastruktur. Skredene kan skade mennesker og menneskelige interesser, og det investeres store summer i sikringstiltak. Skredprosesser er med på å utvikle landskapet og kan spores på bakgrunn av mer eller mindre karakteristiske landformer, elementer og avsetninger, kalt skredindikatorer. ... -
Heinrich events of the late Pleistocene; evidence from a sediment core west of Jan Mayen. An analogue to present day ice sheet collapse?
(Master thesis; Mastergradsoppgave, 2017-05-15)A thorough lithological investigation of deep sea sediment core HH13-100GC has been undertaken, in order to investigate the climate and oceanographic fluctuations of the last glacial epoch. The cause of Heinrich events has remained an enigma ever since the discovery of Heinrich layers in the North Atlantic in the 1980s. Through a combination of XRF and X-ray imagery, geotechnical property investigation, ... -
The occurrence of flow transformations within sandy submarine fans: A case study from the Eocene on Spitsbergen
(Master thesis; Mastergradsoppgave, 2017-05-15)The Van Keulenfjorden transect on Spitsbergen offers valuable insight into submarine processes, with well exposed seismic scale clinoforms of Paleocene and Eocene age, which show the distribution of sediments from deltaic to basin floor environments. Several progradational submarine fans are preserved as cliffs on Hyrnestabben. They serve as an analogues to coarse grained submarine fans in provinces ... -
Investigating the variability of Atlantic water inflow to the southwestern Barents Sea through Bjørnøyrenna during the Late Glacial and Holocene based on benthic foraminifera and sediment properties.
(Master thesis; Mastergradsoppgave, 2017-05-15)This study is a part of the Barents Sea drill cuttings research initiative (BARCUT), investigating the inflow of Atlantic water to the southwestern Barents Sea during the Late Glacial and Holocene as well as providing data for future references. -
Study of millennial scale paleoclimatic and paleoceanographic changes in conjunction with variations in the East Greenland Current during the late Quaternary
(Master thesis; Mastergradsoppgave, 2017-05-15)Sediment core HH13-089GC (497 cm), collected from the continental slope off Scoresby Sund, East Greenland has been investigated in order to study paleoclimatic and paleoceanographic changes in the area in conjunction with variations in the East Greenland Current during the late Quaternary. The results are based on a multiproxy analysis of the sediment core, including faunal investigations of planktic- ... -
Sedimentological and geomorphological study of a postglacial fjord-side landslide and fan-delta complex at Russenes, inner Balsfjord, Troms county
(Master thesis; Mastergradsoppgave, 2017-05-15)A comprehensive study of the Russenes postglacial fjord-side fan delta and landslide complex has been undertaken in inner Balsfjord, Troms county, northern Norway. High-resolution bathymetric data, digital terrain models, aerial photography, ground penetrating radar profiling, radiocarbon dating and field mapping have been used to determine the geometry, structure, lithofacies and evolution of the ... -
Sedimentary environment and seismic anomalies of the upper Brygge and Kai formations on the northern part of the Mid-Norwegian Continental Shelf
(Master thesis; Mastergradsoppgave, 2017-05-15)The sedimentary environment and seismic anomalies of the upper Brygge and Kai formations on the northern part of the Mid-Norwegian Continental Shelf is analysed from 3D seismic data and the exploration well 6604/2-1. This was done in order to give a better understanding of the paleo-climatic development in the period before the establishment of the large-scale ice sheets of the Northern Hemisphere, ... -
Geomorfologisk analyse og skredkartlegging av Setså-området i Saltdal kommune, Nordland
(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
(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
(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
(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
(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
(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
(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.
(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
(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
(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
(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
(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
(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 ...
