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norskFakultet for naturvitenskap og teknologi: Nye registreringer
Viser treff 4201-4220 av 5433
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Ice Detection of Pure and Saline Ice Using Infrared Signature
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-30)The paper shows the possible implementation of an Infrared (IR) ice detection technique. In respect of safety in marine operations, saline ice detection can be significant for automated de-icing systems. Experimentation is performed to observe and detect saline and pure ice samples. The discussed detection mechanism is unique and differs from passive IR detection by introducing the self-heating ... -
Past methane emissions in the earliest Pleistocene on Yermak Plateau, NW Svalbard.
(Master thesis; Mastergradsoppgave, 2016-05-15)Hole 912A (Ocean Drilling Program (ODP) Leg 151) drilled on the Yermak Plateau (eastern Arctic Ocean) is used to investigate past methane emissions in the earliest Pleistocene. Preliminary work showed depleted δ¹³C values at 93-96 meters below sea floor (mbsf), and an increase in methane concentration between 11, 5 and 23 mbsf. A secondary sampling focused on intervals between 10 and 23 mbsf (core ... -
Management of risks - a Paradox?
(Conference object; Konferansebidrag, 2016-11-23) -
Ice Detection Setup Using Infrared and Active Heating
(Conference object; Konferansebidrag, 2015)Considering the cold environment operations, ice accretion can occur at a rapid pace and can adversely affect the operations. In such scenario, ice detection is useful for the ice mitigation and removal upon the marine and offshore structures. Various techniques exist in the literature to detect the icing mainly utilizing its physical or electromagnetic properties. The parameters measured by these ... -
Improving Mechanical Grip of Tyres on Snow and Icy Road Surfaces using Finite Element Method
(Conference object; Konferansebidrag, 2016)Harsh winter conditions are known to be one of the most challenging environments for driving. Although the number of fatal accidents is higher during the summer compared to the winter in Norway (according to Norwegian Highways Authority), the total number of accidents is higher in the winter season. These accidents mainly happen due to loss traction on snowy or icy road surfaces. The loss of traction ... -
Solution of Pure Scattering Radiation Transport Equation using Finite Difference Method
(Conference object; Konferansebidrag, 2016-12)Radiative transfer is the physical phenomenon of energy transfer in the form of electromagnetic radiation. The propagation of radiation through a medium is affected by absorption, emission, and scattering processes. Equations of radiative transfer have application in a wide variety of subjects including optics, astrophysics, atmospheric science, and remote sensing. Analytic solutions to the radiative ... -
Computational Fluid Dynamic Analysis of the Tesla Turbine
(Conference object; Konferansebidrag, 2016-12-08)Serbian-born inventor Nikola Tesla invented the Tesla turbine and patented it in 1913. The Tesla turbine is unique in the sense that it does not have any blades, also referred to as “bladeless turbine”. The working was based on the establishment of the fluid boundary layer. The original Tesla turbine consisted of multiple smooth discs. With the passage of flow, a boundary layer establishes and skin ... -
Study of Materials’ Impact Properties for Arctic Marine Structures
(Conference object; Konferansebidrag, 2016-12)It is well understood that sea ice is one of the biggest problems for the safety and reliability of ships and marine structures operating in the Arctic. Specially designed ships, also known as ‘icebreakers’, are usually used to clear ice to make way for merchant and cruise ships. Even then, the ship’s staff must be extremely careful with speed and steering. Heavy impacts of ice result in fatigue and ... -
Study of Ice Adhesion Behavior of SK One Component Polyurethane
(Conference object; Konferansebidrag, 2016-12)Ice adhesion causes many serious problems such as aircraft accidents, navigational issues on ships, and power loss on wind turbines. These challenges are mainly associated with the acute behavior of ice adhesion. The ice adheres when water seeps into the microscopic pores of the material substrate and freezes, thereby, forming an interlocking mechanism. Therefore, surface roughness has a significant ... -
Marketing structures and strategies of Nordic SME’s: A Norwegian case study
(Conference object; Konferansebidrag, 2016-10-10) -
Wind speed and direction predictions by WRF and WindSim coupling over Nygårdsfjell
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016)In this study, the performance of the mesoscale meteorological Weather Research and Forecast (WRF) model coupled with the microscale computational fluid dynamics based model WindSim is investigated and compared to the performance of WRF alone. The two model set-ups, WRF and WRF-WindSim, have been tested on three high-wind events in February, June and October, over a complex terrain at the ... -
Complete genome sequence of Halomonas sp. R5-57
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016)The marine Arctic isolate Halomonas sp. R5-57 was sequenced as part of a bioprospecting project which aims to discover novel enzymes and organisms from low-temperature environments, with potential uses in biotechnological applications. Phenotypically, Halomonas sp. R5-57 exhibits high salt tolerance over a wide range of temperatures and has extra-cellular hydrolytic activities with several ... -
Interpreting sea surface slicks on the basis of the normalized radar cross-section model using RADARSAT-2 copolarization dual-channel SAR images
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-24)A simple automatic multipolarization technique for discrimination of main types of thin oil films (of thickness less than the radio wave skin depth) from natural ones is proposed. It is based on a new multipolarization parameter related to the ratio between the damping in the slick of specially normalized resonant and nonresonant signals calculated using the normalized radar cross-section model ... -
A polarizable continuum model for molecules at spherical diffuse interfaces
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-22)We present an extension of the Polarizable Continuum Model (PCM) to simulate solvent effects at diffuse interfaces with spherical symmetry, such as nanodroplets and micelles. We derive the form of the Green’s function for a spatially varying dielectric permittivity with spherical symmetry and exploit the integral equation formalism of the PCM for general dielectric environments to recast the solvation ... -
Wind Energy at Nygårdsfjellet – Norway. Wind field characterization and modelling
(Doctoral thesis; Doktorgradsavhandling, 2016-11-25)The research focuses on the characterization of wind flow over complex terrain of Nygårdsfjell and numerical wind flow modelling. In the context to research focus, the main contributions of this research thesis are within the following areas: Characterization of wind flow at the Nygårdsfjell wind farm, situated in the arctic circle in Norway. Wind data is collected from the anemometers installed on ... -
Granskingsdilemmaer i tilsyn og kommisjon. En komparativ dokumentanalyse av Statens havarikommisjon for transport og Petroleumstilsynet
(Mastergradsoppgave; Master thesis, 2016-09-23)I denne oppgaven gjør jeg en komparativ dokumentanalyse av Statens havarikommisjon for transport (SHT) og Petroleumstilsynet (Ptil). Den undersøker hvordan rekke granskingsdilemmaer påvirker granskinger, ved å forklare hvordan disse dilemmaene påvirker granskingenes læringspotensial. Dilemmaene knytter seg til granskingenes mandat, metodikk og forklaringsmodell, uavhengighet, forebyggingstiltak samt ... -
Ice sheet dynamics in the Brunt Basin, Weddell Sea, Antarctica, since the last glacial period
(Master thesis; Mastergradsoppgave, 2016-11-15)High-resolution swath bathymetry, TOPAS sub-bottom profiles and four gravity cores from the Brunt Basin, southeastern Weddell Sea in Antarctica, were analysed with the purpose of reconstructing the ice sheet dynamics since the last glacial. Data collection was carried out by the British Antarctic Survey (BAS) and data analyses were carried out in a collaboration between the Department of Geosciences ... -
Bretilbaketrekningshistorie og landformer foran Steindalsbreen, Lyngen, Troms
(Master thesis; Mastergradsoppgave, 2016-06-15)Steindalen er lokalisert sør på Lyngenhalvøya, i Troms fylke. Steindalsbreen er en av de lettest tilgjengelige breer i området. Dette gjør breen til et yndet turmål, men det gjør det også lettere å studere en bre på nært hold. Undersøkelse av Steindalsbreen har foregått ved hjelp av feltturer til området, ved å studere foto og flybilder over området og ved å sammenstille data samlet over mange år, ... -
Wind resource assessment using mesoscale modelling. A case study at the potential wind farm site Rieppi
(Master thesis; Mastergradsoppgave, 2016-06-01)The growing wind power industry, increased occurrence of extreme weather, and the need for becoming independent of fossil fuels motivate the research on accurate simulation of near-surface wind. The aim of this study is wind resource assessment at the potential wind park site Rieppi, using two on-site measurement masts, simulations from the Weather Research and Forecasting (WRF) model, and ERA-Interim ... -
Numerical computations of turbulent motions in magnetized plasmas
(Master thesis; Mastergradsoppgave, 2016-05-18)Intermittent fluctuations and turbulence-induced transport of magnetically confined fusion plasmas are investigated by numerical computations. A reduced fluid model describing the evolution of plasma pressure and electric drift vorticity in a two-dimensional plane perpendicular to the magnetic field is derived. A numerical simulation code implemented on graphical processing units is presented. We ...
