Radio wave absorption in the ionosphere is a function of electron density, collision frequency, radio wave polarisation, magnetic field and radio wave frequency. Several studies have used multi-frequency measurements of cosmic radio noise absorption to determine electron density profiles. Using the framework of statistical inverse problems, we investigated if an electron density altitude profile ...

The Polarimetric Synthetic Aperture Radar (PolSAR) backscatter from a target is dependent on the incidence angle. Consequently, the associated roll invariant parameters are affected by changes in incidence angle. In this work, we identify a few of these parameters that remain robust in identifying sea ice features even under large incidence angle variations. We conclude that the helicity angle ...

The damping ratio is a calculated feature that measures the contrast between oil-slicked water and the open ocean in SAR data. To implement the damping ratio, the current literature suggests estimating the open water backscatter by taking strips of undefined width across the range direction, obtaining the damping ratio as a function of incidence angle. We show in this paper that the method proposed ...

Histology involves the observation of structural features in tissues using a microscope. While diffraction-limited optical microscopes are commonly used in histological investigations, their resolving capabilities are insufficient to visualize details at subcellular level. Although a novel set of super-resolution optical microscopy techniques can fulfill the resolution demands in such cases, the ...

Ice loss from the Greenland ice sheet is one of the largest sources of contemporary sea-level rise (SLR). While process-based models place timescales on Greenland’s deglaciation, their confidence is obscured by model shortcomings including imprecise atmospheric and oceanic couplings. Here, we present a complementary approach resolving ice sheet disequilibrium with climate constrained by satellite-derived ...

Soret-excited resonance Raman spectra (λ_ex 413.1 nm) were acquired for manganese(III) and gold(III) tris(pentafluorophenyl)corrole, each as four different isotopomeric samples: natural abundance, fully pyrrole-¹⁵N-substituted, fully meso¹³C-substituted, and fully pyrrole-¹⁵N-meso¹³C-substituted. The spectra were modeled with density functional ...

Samfunnet vårt er konstant under endringer og klimaendringene er en av vår tids største utfordringer. Klimaendringer vil kunne fører til naturkatastrofer som utartes til å bli krise i en kommune. Vi har allerede sett at flere kommuner har blitt rammet av alvorlige flomhendelser det siste tiåret. Klimaframskrivninger tilsier at kommuner på Vestlandet, Sør-Norge og Nordland vil kunne bli rammet av ...

Det siste århundre har det vært stort fokus på forskning, om fatigue. Allerede i 1990 så satte FAA fatigue som en av de store årsakene man måtte bekjempe for å gjøre luftfarten trygg. Etter dette har det blitt gjennomført mye forskning blant piloter. Forskning frem til i dag har hatt lite fokus på fatigue blant flygeledere. Derfor har denne masteroppgaven sett på fatigue blant flygeldere, og hvordan ...

In recent years, multistatic specular meteor radars (SMRs) have been introduced to study the Mesosphere and Lower Thermosphere (MLT) dynamics with increasing spatial and temporal resolution. SMRs, compared to other groundbased observations, have the advantage of continuously measuring the region between 80 and 100 km independent of weather, season, or time of day. In this paper, frequency spectra ...

Alzheimer’s disease (AD) is the most common neurodegenerative disease which is becoming increasingly prevalent due to ageing populations resulting in huge social, economic, and health costs to the community. Despite the pathological processing of genes such as Amyloid Precursor Protein (APP) into Amyloid-β and Microtubule Associated Protein Tau (MAPT) gene, into hyperphosphorylated Tau tangles being ...