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norskFakultet for naturvitenskap og teknologi: Nye registreringer
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Integrating incidence-angle compensation in the segmentation of UAVSAR images
(Conference object; Konferansebidrag, 2018)<p>SAR images display a characteristic intensity variation along the range dimension, caused by the fact that the backscattered intensities depend on the incidence angle. In the case of wide-swath images, this intensity variation from near range to far range is significant enough to affect image segmentation performed on absolute intensity values. The effects are an over-segmentation which creates ... -
Arctic Field Summer Schools: training the next generation of Arctic researchers
(Conference object; Konferansebidrag, 2018)<p>The Arctic Field Summer Schools project is funded by the Research Council of Norway (NFR) and Norwegian Centre for International Cooperation in Education (SIU), under the grant agreement number 261786/H30. <p>The project supports research and education collaboration among UiT - The Arctic University of Norway, University of Alaska Fairbanks (UAF), USA and University of Calgary (UC), Canada. <p>Through ... -
Modeling Microwave Scattering From Rough Sea Ice Surfaces
(Conference object; Konferansebidrag, 2017)In this paper, COMSOL Multiphysics® was used to simulate the microwave scattering from the rough sea ice surface. A nonperiodic model and a periodic model were built. The nonperiodic model considers the rough surface of finite length and introduces a tapered incident wave. In this model, the strategy of total and scattered-field decomposition (TSFD) was used to formulate the finite-element method ... -
Self-similarity of intrasalt thrust faults: Lessons from offshore Levant Basin and the Dead Sea
(Conference object; Konferansebidrag, 2017)The Levant Basin in the eastern Mediterranean Sea developed during rifting episodes occurring from Permian to the Early Jurassic (Netzeband et al. 2006; Gardosh et al. 2010), and has been a deep-water basin with a passive continental margin at least since the Cretaceous (Gardosh et al. 2008). Thick sequences of halite and interbedded shales (stringers) were deposited during the infamous Messinian ... -
Label-free imaging on waveguide platform with enhanced resolution and contrast
(Conference object; Konferansebidrag, 2021)Chip-based Evanescent Light Scattering (cELS) utilizes the multiple modes of a high-index contrast optical waveguide for near-field illumination of unlabeled samples, thereby repositioning the highest spatial frequencies of the sample into the far-field. The multiple modes scattering off the sample with different phase differences is engineered to have random spatial distributions within the integration ... -
Faszination Nano-Staubteilchen im Kosmos - Astronomie als Puzzle
(Conference object; Konferansebidrag, 2018) -
Radar studies of ionospheric dust - plasma phenomena
(Conference object; Konferansebidrag, 2018)Dust plasma phenomena occur in the Earth ionosphere in particular in the meteor ablation zone at altitudes ~50-95 km and above where radar meteors form. Radar also detect coherent polar mesospheric radar echoes (PME), i.e. radar echoes that are caused by spatial variations in the plasma refractive index at around 80 to 90 km altitude in the Earth’s mesosphere. During summer, PM(S)E form in the ... -
Lateral membrane organization as target of an antimicrobial peptidomimetic compound
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-07)Antimicrobial resistance is one of the leading concerns in medical care. Here we study the mechanism of action of an antimicrobial cationic tripeptide, AMC-109, by combining high speed-atomic force microscopy, molecular dynamics, fluorescence assays, and lipidomic analysis. We show that AMC-109 activity on negatively charged membranes derived from Staphylococcus aureus consists of two crucial steps. ... -
The Fate of Nanodust near the Sun - Comparison of Sputtering and Sublimation lifetimes during CMEs
(Conference object; Konferansebidrag, 2018)The dust environment in the inner Solar system has not been probed so far, but ESA’s Solar Orbiter (2020) and NASA’s Parker Solar Probe (2018) are about cross the inner solar system. From [1] we expect a layer of trapper Nanodust around the Sun. [2] investigated the interaction of grains with the Solar wind. But what is the dust’s fate when they are struck by a Coronal Mass Ejection (CME). Are they ... -
Sputtering through coronal mass ejections and the fate of nanodust near the Sun
(Conference object; Konferansebidrag, 2018) -
Statistical properties of fluctuation driven flows in the outboard mid-plane SOL of Alcator C-Mod
(Conference object; Konferansebidrag, 2018)The scale length of the radial density profile in scrape-off layer plasmas has been shown to depend on the line-averaged plasma density. While first reported on AlcatorC-Mod, recent work verifies this phenomena in JET and ASDEX Upgrade. In low density plasmas with a sheath-limited SOL, the density profiles present a two-scale structure which allows the separation of the SOL into two distinct regions. ... -
Glacigenic landforms and sediments in Store Koldewey Trough, NE Greenland – preliminary results
(Conference object; Konferansebidrag, 2018-04)The glaciation history of NE Greenland remains poorly constrained, resulting in conceptual and uncertain reconstructions of the configuration of the Greenland Ice Sheet during the Last Glacial Maximum (c. 24-19 ka BP), as well as the timing and the dynamics of the deglaciation. New studies suggests that the ice sheet in NE Greenland probably was more dynamic than previously thought, extending all ... -
Arctic, marine bacteria and their ability to produce polyhydroxyalkonates (PHAs) using underexploited biomass as nutrient source
(Conference object; Konferansebidrag, 2017)<p>In this project we are studying marine bacteria and their ability to produce polyhydroxyalkonates (PHAs), a fully biodegradable polyester known as bioplastic. Bioplastics can replace petroleum-based plastics in many applications. PHAs accumulate as intracellular carbon and energy storages when the bacteria grow in an environment with nutrient imbalance. The monomeric building blocks in the PHA ... -
Arctic marine bacteria for bioplastic production
(Conference object; Konferansebidrag, 2018)<p>Oil-based plastic production now exceeds 330 Mt annually1 and poses a major environmental problem. Polyhydroxyalkanoates (PHA) is a group of bioplastic polyesters that can replace oil-based plastics in many applications, but economic costs are higher and industrial-scale production still limited. PHA is produced naturally by diverse groups of bacteria and stored intracellularly as hydrophobic ... -
The Early to Middle Cenozoic Paleoenvironment and Erosion Estimates for the northwestern Barents Sea
(Conference object; Konferansebidrag, 2017)<p>The northwestern Barents Sea continental margin is a structurally complex area characterized by a series of basins and highs. It’s Cenozoic development was influenced by: 1) the formation of the Spitsbergen fold-andthrust belt towards the north and a pull-apart basin, the Vestbakken Volcanic Province, to the south, and 2) the subsequent rifting and opening of the Fram Strait, the deep-water gateway ... -
Second-order PDEs in four dimensions with half-flat conformal structure
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-29)We study second-order partial differential equations (PDEs) in four dimensions for which the conformal structure defined by the characteristic variety of the equation is half-flat (self-dual or anti-self-dual) on every solution. We prove that this requirement implies the Monge–Ampère property. Since half-flatness of the conformal structure is equivalent to the existence of a non-trivial dispersionless ... -
KAIRA Science Results
(Conference object; Konferansebidrag, 2018) -
Land cover changes detection in polarimetric SAR data using algebra, similarity and distance based methods
(Journal article; Tidsskriftartikkel, 2017-09-27)Monitoring and surveillance changes around the world need powerful methods, so detection, visualization, and assessment of significant changes are essential for planning and management. Incorporating polarimetric SAR images due to interactions between electromagnetic waves and target and because of the high spatial resolution almost one meter can be used to study changes in the Earth's surface. Full ... -
Turbidites in the Eocene of Spitsbergen: Can they tell us something about the Sørvestsnaget Basin?
(Conference object; Konferansebidrag, 2017)<p>The Eocene of Spitsbergen, Svalbard, has received considerable attention in the literature because of its spectacular seismic-scale clinforms exposed along many fiords and valleys. High quality outcrops enables downdip tracing of facies belts from the proximal shelf through the shelf-edge and down-slope into the basin floor. Previous publications particularly focused on the shelf-edge to slope ... -
Analysis of Deep Convolutional Neural Networks Using Tensor Kernels and Matrix-Based Entropy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-03)The aquaculture industry is expanding to meet the daily requirements of humanity from high-quality seafood. In this regard, intensive aquaculture systems are suggested, resulting in high production but being challenged with immunosuppression and disease invaders. Antibiotics were used for a long time to protect and treat aquatic animals; however, continuous use led to severe food safety issues, ...
