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norskFakultet for naturvitenskap og teknologi: Recent submissions
Now showing items 4541-4560 of 5442
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QRA techniques on dynamic positioning systems during drilling operations in the Arctic: With emphasis on the dynamic positioning operator
(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
(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 ... -
The role of safety culture in establishing an effective safety information system in the oil and gas industry. A case study of an onshore facility
(Master thesis; Mastergradsoppgave, 2015-06-01)The main purpose of this study was to contribute to understanding of how safety culture affects the performance of safety information systems (SISs). More particularly, to investigate how safety culture can both facilitate and inhibit a SIS to function effectively. The thesis has been carried out as a qualitative, single case study of an onshore facility in the oil and gas industry. Seven ... -
Politiets krisehåndteringsevne i før, akutt og etterkrisefasen
(Master thesis; Mastergradsoppgave, 2015-05-30)Norsk politi har etter terrorhendelsene 22.juli 2011 vært gjennom flere granskninger og evalueringer av sin innsats under denne hendelsen og andre ekstraordinære hendelser. Hendelsene har ført til et økt fokus på politiets krisehåndteringsevne og politiet går i årene fremover inn i en svært spennende periode hvor mye skal endres for å styrke beredskapen i politiet. Dette studiet har som formål å ... -
Risikopersepsjon og klimaendringer. En studie av flom i Flåm
(Master thesis; Mastergradsoppgave, 2015-06-01)Denne masteroppgaven ser nærmere på studien av risikopersepsjon som har til formål å vise at dette er et sentralt forskningsområde i samfunnet vårt. Som konsekvens av de økte klimaendringene ser vi som i min studie hvor sårbart Flåm som bygd kan bli i møte med uønskede hendelser som flom og hvor utfordrende det er for mennesker å imøtekomme flom som risiko. Hovedformålet med denne oppgaven er derfor ... -
Teamarbeid under kritiske arbeidsoppdrag. Ein casestudie
(Master thesis; Mastergradsoppgave, 2015-06-01)Denne studien skal undersøke korleis ein kan sikre utføring av kritiske arbeidsoperasjonar, her illustrert gjennom operative redningsteam. Det har vorte hevda at det finnast lite empiri om kva som er avgjerande for at operative team presterar, men at etablert teori om teamarbeid kan brukast for å forklare prestasjon i operative team (Flin, 1996). Samtidig, bèr naturen ved arbeidsoppdraga til operative ... -
Læreprosesser ved teknisk avdeling i luftfart. En kvalitativ studie om formell og uformell læring i LT Tech AS
(Master thesis; Mastergradsoppgave, 2015-06-01)Oppgaven tematiserer formelle og uformelle læreprosesser i flyhangaren ved teknisk avdeling i et flyselskap. Feltarbeidet har blitt gjort på LT Tech AS ved Lufttransport AS’ hovedbase i Tromsø. Oppgavens problemstilling er «Hvordan bidrar uformelle læreprosesser i utviklingen av kyndighet og kompetanse hos teknisk personell i LT Tech AS?» I luftfart stilles høye krav til sikkerhet. Så lenge luftfarten ... -
Rapporteringskultur og pasientsikkerhet
(Master thesis; Mastergradsoppgave, 2015-06-01)Denne studien tar for seg å undersøke hvordan rapporteringskultur påvirker forbedring av pasientsikkerhet på en sykehusavdeling. Det var i min jobb som assistent på en sykehusavdeling jeg opplevde at mange ikke hadde fått opplæring i å bruke rapporteringssystemet for å registrere avviksmeldinger eller uønskede hendelser. Hensikten med å benytte rapporteringssystemer er å lære av og forhindre at ... -
Fast estimation of ocean background reflectivity in synthetic aperture radar images
(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
(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 ... -
Platinum Corroles
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-06-09)Platinum has been inserted into corroles for the first time and three oxidized PtIV(corrole2)ArAr0 complexes have been structurally characterized. The Soret maxima of these complexes exhibit an unusually strong dependence on the meso-aryl substituents on the corrole, indicating aryl - corrole2 charge transfer character in these transitions. -
The complex structures of isocitrate dehydrogenase from Clostridium thermocellum and Desulfotalea psychrophila support a new active site locking mechanism
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012-07-07)Isocitrate dehydrogenase (IDH) catalyzes the oxidative NAD(P)+ -dependent decarboxylation of isocitrate into a-ketoglutarate and CO2 and is present in organisms spanning the biological range of temperature. We have solved two crystal structures of the thermophilic Clostridium thermocellum IDH (CtIDH), a native open apo CtIDH to 2.35 Å and a quaternary complex of CtIDH with NADP+ , isocitrate and ... -
Regional melt-pond fraction and albedo of thin Arctic first-year drift ice in late summer
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-02-09)The paper presents a case study of the regional ( ≈ 150 km) morphological and optical properties of a relatively thin, 70–90 cm modal thickness, first-year Arctic sea ice pack in an advanced stage of melt. The study combines in situ broadband albedo measurements representative of the four main surface types (bare ice, dark melt ponds, bright melt ponds and open water) and images acquired by a ... -
Ice rafting, Ocean circulation and Glacial activity on the western Svalbard margin 0–74 000 years BP
(Doctoral thesis; Doktorgradsavhandling, 2015-03-27)The thesis builds on 11 sediment cores from c. 600 to 1900 m water depth from the continental slope west of Svalbard and one core from the Barents Sea shelf. Together, the cores cover the last 74,000 years. The primary goal was to gain a better insight in ocean circulation and glacial activity in a climatic context on glacial-interglacial and millennial time scales. The main parameters studied are ... -
On the Generalized Curvature Ocean Surface Scattering Model for the NRCS and Doppler Frequency and its application to ocean surface wind retrieval from Synthetic Aperture Radar data
(Doctoral thesis; Doktorgradsavhandling, 2015-01-23)Ocean wind monitoring is an integral part of weather forecasting, maritime shipping lane planning, offshore wind research, as well as the study of climate patterns. Satellite radar instruments, such as Synthetic Aperture Radars (SAR), can help achieve this important task by monitoring the wind conditions over the sea surface. Using specially developed functions, called geophysical model functions, ... -
Study of the Late Cenozoic depositional environment and seismic anomalies on the Trøndelag Platform using 3D seismic data
(Master thesis; Mastergradsoppgave, 2015-06-04)This thesis has focused on the depositional environment during the development of the Naust Formation in order to improve our understanding of the glacial history of the mid-Norwegian continental shelf, using 3D-seismic data from the Trænabanken and Sklinnadjupet area along with regional 2D-lines. Seismic anomalies have also been investigated to increase our understanding of fluid migration affecting ... -
Giga-View. A distributed gigapixel image viewer controlled by mobile devices
(Master thesis; Mastergradsoppgave, 2015-06-01)This thesis presents Giga-View, a gigapixel image viewer controllable from mobile devices. It's design makes interaction available through a web browser and requires no software installation or high processing power from the device being used. Fulfilling the goal of high throughput and low latency, Giga-View is capable of processing an input stream with the frame rate of 60 frames per second, without ... -
Casuar - A Protected Library OS for running Windows applications on top of Vortex
(Master thesis; Mastergradsoppgave, 2015-06-15)Today, virtual machines (VMs) are commonly employed to encapsulate and isolate workloads in the cloud, enabling efficient utilization of hardware resources through the use of statistical multiplexing. Still, there is a significant overhead associated with the use of VMs; each VM instance has to contain a complete OS environment to support the execution of applications that are dependent on the ... -
Implementing an SMB2 Server in the Vortex Operating System
(Master thesis; Mastergradsoppgave, 2015-05-15)With the advent of computer networks, the ability for sharing and accessing files across the network between multiple workstations and remote servers was sought after. In the nineteen eighties, prominent networked file systems were developed and reached widespread adoption among enterprise businesses and institutions. A few of these, notably Networked File System (NFS) and Server Message Block (SMB), ... -
Practical synthetic methods for three unstable, unsaturated bromomethyl ketones, and on the use of near-orthogonal experiments for synthetic exploration.
(Doctoral thesis; Doktorgradsavhandling, 2015-06-18)The thesis consists of two different parts: The organic part presents the development of a convenient procedure for the synthesis of three rare, unstable α,β-unsaturated brominated methyl ketones from common commercially available regents. This family of molecule has been very challenging to synthesize and a short history about these efforts as well as different general strategies to produce them ...
