Fakultet for naturvitenskap og teknologi: Recent submissions
Now showing items 101-120 of 4870
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Emotional and ecological literacy for a more sustainable society
(Book; Bok, 2024) -
Post-glaciation depositional changes in Wijdefjorden, northern Svalbard, using grain-size end-member modelling
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-11)Grain-size end-member (EM) modelling is a robust statistical approach for identifying and quantifying dominant grain-size distributions. This approach provides a novel perspective for understanding the impact of interactions between depositional processes in complex sedimentary environments. This study examines grain-size distributions of six glacimarine sediment cores collected along an Nsingle ... -
Sediment DNA metabarcoding and morphology provide complementary insight into macrofauna and meiobenthos response to environmental gradients in an Arctic glacial fjord
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-11)Arctic fjords ecosystems are highly dynamic, with organisms exposed to various natural stressors along with productivity clines driven by advection of water masses from shelves. The benthic response to these environmental clines has been extensively studied using traditional, morphology-based approaches mostly focusing on macroinvertebrates. In this study we analyse the effects of glacially mediated ... -
Risk Assessment of a Mars Colony Utilizing a Mars-Svalbard Training Analog
(Master thesis; Mastergradsoppgave, 2024-05-04)As the space industry is rapidly privatized and countries once again have their eyes set on the moon and beyond, humanity is getting closer and closer to the days where a colony on Mars is a reality. During the preliminary planning phase of a mission to Mars, a large scale, top-down overview is essential. This report applies a risk and safety engineering approach to identify each of the core hazards, ... -
Contribution of fluorescent primary biological aerosol particles to low-level Arctic cloud residuals
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-13)Mixed-phase clouds (MPCs) are key players in the Arctic climate system due to their role in modulating solar and terrestrial radiation. Such radiative interactions rely, among other factors, on the ice content of MPCs, which is regulated by the availability of ice-nucleating particles (INPs). While it appears that INPs are associated with the presence of primary biological aerosol particles (PBAPs) ... -
Lithium-ion battery digitalization: Combining physics-based models and machine learning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-21)Digitalization of lithium-ion batteries can significantly advance the performance improvement of lithium-ion batteries by enabling smarter controlling strategies during operation and reducing risk and expenses in the design and development phase. Accurate physics-based models play a crucial role in the digitalization of lithium-ion batteries by providing an in-depth understanding of the system. ... -
Molecules and Morphotypes – Exploring benthic foraminiferal biodiversity in seep-influenced habitats
(Master thesis; Mastergradsoppgave, 2023-05-15)Beneath the seafloor, methane, a potent greenhouse gas, is trapped in ice-like structures, prone to destabilization and gas release in a warming climate. Gas releases through the seabed concentrated in seeps, creating unique ecosystems, hostile to some lifeforms but able to sustain others. Foraminifera have proved useful in biodiversity and ecosystem quality assessment due to their ubiquity in ... -
Insights into glacial processes from micromorphology of silt-sized sediment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-07)Silt-rich meltwater plume deposits (MPDs) analyzed from marine sediment cores have elucidated relationships that are clearly connected, yet difficult to constrain, between subglacial hydrology, ice-marginal landforms, and grounding-zone retreat patterns for several glacial catchments. Few attempts have been made to infer details of subglacial hydrology, such as flow regime, geometry of drainage ... -
Acoustic evidence of hydrocarbon release associated with the Spitsbergen Transform Fault, north of the Molloy Ridge, Fram Strait
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-16)Hydrocarbon gases formed from biotic and abiotic processes are released through the seafloor at different locations around the world. They have been widely observed directly in video and photo data, and indirectly on echosounder data. Even though biotic gas generation is a very common process, abiotic gas generation is limited to regions where serpentinization of ultramafic rocks occur. Indications ... -
Sedimentological and geochemical investigations of hydrothermally impacted sediments at the Aurora vent field, Fram Strait
(Mastergradsoppgave; Master thesis, 2023-05-15)Hydrothermal vents are the result of the interaction between seawater and magma and occur at regular intervals along mid ocean ridges. The first visual confirmation of plumes was done in 1977. The detection of hydrothermal plumes has both provided indirect evidence for their existence and a resolution of the occurrences . In deep ocean with low sedimentation rates, hydrothermal plumites have the ... -
Software Defined Radio Based Avalanche Beacon Receiver
(Master thesis; Mastergradsoppgave, 2024-01-24)Annually, avalanches claim an average of 100 lives, and many more are injured. For victims buried by an avalanche, time is of the essence. If not rescued within 15 minutes, the victim only has a 10% probability of survival. Commonly, the people venturing into avalanche-prone areas equips avalanche beacons. These devices work as small radio transmitters transmitting a signal at 457 kHz once each ... -
Hvem bør ha ansvar for kjemilab?
(Preprint; Manuskript, 2024-05-14)Mange ulike studieprogram har et innføringsemne i kjemi, ofte i første studieåret. Et slikt kjemiemne inkluderer vanligvis laboratorieundervisning, som er ressurskrevende å gjennomføre for et stort antall (flere hundre) studenter. Det er vanlig at instituttet som har ansvar for emnet også har ansvar for laboratorieundervisningen. Dermed får studentene på ulike studieprogram samme labøvelser av samme ... -
Enhancing Prediction of Blast-Induced Ground Vibrations through Machine Learning
(Mastergradsoppgave; Master thesis, 2024-01-12)This Master’s thesis investigates the application of Machine Learning (ML) in predicting blast-induced ground vibrations in mining, with the aim of sur- passing the precision of the current industry-standard model that utilizes an empirical, regression-based method. The study applied a Deep Neural Network (DNN) model, selected for its capability to consider a broader range of variables than the ... -
Dia-Continua: An Information System for Type 1 Diabetes Consultation. (Interoperability, Privacy, and Information Quality on a FHIR-Based Information System for Type 1 Diabetes Consultations based on Patient-Generated Health Data)
(Doctoral thesis; Doktorgradsavhandling, 2024-05-30)Patient-generated health data (PGHD) is required to monitor chronic conditions like Type 1 Diabetes (T1D). This data includes information from medical devices like insulin pumps and continuous glucose monitors and lifestyle insights from commercial wearables devices such as smartwatches. To improve the quality of medical consultations, we need a unified information system that can integrate ... -
Localized advanced ship predictor for maritime situation awareness with ship close encounter
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-04)The marine navigation environment can become further complex when ships with different autonomy levels are introduced. To ensure navigation safety in such a mixed environment, advanced ship predictor type technologies are essential in aiding ship navigators to attain the highest levels of situation awareness (SA). Consequently, precise ship trajectory prediction, specifically within a short prediction ... -
Formation of non-evaporitic gypsum in gas hydrate-bearing sediments at Håkon Mosby mud volcano, SW Barents sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-29)Authigenic minerals such as carbonate and iron sulfide are known features at cold seeps worldwide and form as a result of the anaerobic oxidation of methane in the sulfate-methane transition zone (SMTZ). Recent findings of seep-related non-evaporitic gypsum raise questions regarding its distribution, formation mechanisms, and relationships with the other proxies for confident paleo-seep reconstructions. ... -
Petrochronology of the Dom Feliciano Belt foreland in southernmost Brazil reveals two distinct tectonometamorphic events in the western central Kaoko–Dom Feliciano–Gariep orogen
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-26)The Dom Feliciano Belt is the South American part of an extensive Neoproterozoic orogenic system that developed during the late Cryogenian–early Cambrian close to the margin of southwest Gondwana. The link of its evolution with the tectonic processes in its African counterpart is still not well understood. P–T estimates, Lu–Hf garnet–whole-rock ages, U–Pb monazite SIMS ages and REE garnet and monazite ... -
The Roles of Light Absorbing Particles in the Norwegian Arctic Snow
(Mastergradsoppgave; Master thesis, 2023-05-08)Light absorbing particles (LAPs) such as black carbon (BC) and dust can reduce snow albedo and have a positive radiative forcing. Previous studies investigating LAP in snow in Tromsø focused on black carbon (BC) also called elemental carbon because it has human sources, but dust should also be considered because, while largely from natural sources, it is present in higher concentrations. To quantify ... -
Kelvin-Helmholtz versus Gradient drift instability: which one "wins" in the high latitude ionosphere?
(Mastergradsoppgave; Master thesis, 2024-01-14)The high latitude ionosphere is highly irregular, which is caused by plasma patches, flow shears and electron precipitation. These causes are not well understood, but it is thought to be three sources to these irregularities: density gradients, arcs/flow channels and electron precipitation. It is speculated that there are two main mechanisms for the formation of these irregularities. These mechanisms ... -
Biodegradable plastics in Mediterranean coastal environments feature contrasting microbial succession
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-08)Plastic pollution of the ocean is a top environmental concern. Biodegradable plastics present a potential “solution” in combating the accumulation of plastic pollution, and their production is currently increasing. While these polymers will contribute to the future plastic marine debris budget, very little is known still about the behavior of biodegradable plastics in different natural environments. ...