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norskFakultet for naturvitenskap og teknologi
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Incidence angle dependency and seasonal evolution of L and C-band SAR backscatter over landfast sea ice
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-02)We estimate sea-ice type specific incidence angle (IA) dependencies for dual polarized (HH/HV) L and C-band synthetic aperture radar (SAR) for the winter, melt onset and advanced melt seasons for level and deformed ice, using time-series of Advanced Land Observing Satellite-2 (ALOS-2) and Sentinel-1 imagery off the north-east coast of Greenland. The IA dependencies are used to radiometrically ... -
Marine activities in deep water and harsh weather conditions
(Conference object; Konferansebidrag, 2024-11)Objective of presentation:<uli> <li>Of particular concern is the difference between short-term activities, which can be conducted within a good weather forecast period, and activities that take longer time, or may be regarded as a permanent activity. </li> <li>First, a discussion of short-term marine activities will be given, emphasizing aspects specifically related to deep water, such as the ... -
Marine and Maritime Inventions and Innovations
(Conference object; Konferansebidrag, 2024-11-27)Content: <ol> <li>Marine and maritime inventions and innovations</li> <li>An invention</li> <li>From invention to a product</li> <li>From an innovation to a product</li> <li>Specific considerations</li> <li>Examples</li> <li>Questions</li> </ol> -
Improving Land Surface Temperature Estimation in Cloud Cover Scenarios Using Graph-Based Propagation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-03)Land surface temperature (LST) serves as an important climate variable which is relevant to a number of studies related to energy and water exchanges, vegetation growth and urban heat island effects. Although LST can be derived from satellite observations, these approaches rely on cloud‐free acquisitions. This represents a significant obstacle in regions which are prone to cloud cover. In this ... -
Undervisningsmateriale i Kaldt Klima Teknologi for Maritim Næring. En statusrapport vedrørende utarbeidelse av nytt kursmateriell
(Conference object; Konferansebidrag, 2024-11-28)Behov for prosjektet:<p> <p>❑ Behov for å modernisere undervisningsopplegget for maritim næring i nord. <p> <p>❑ Vi foreslo at en serie med kurs gjøres tilgjengelig for våre studenter og for næringsaktører. <p> <p>❑ Kursoppleggene vil også kunne deles med andre som driver undervisning for maritim næring. -
INTEND: Human-Like Intelligence for Intent-Based Data Operations in the Cognitive Computing Continuum
(Chapter; Bokkapittel, 2024)This paper outlines a research roadmap of the INTEND project towards the development of a cognitive computing continuum that leverages human-like intelligence for intent-based data operations. The primary objective of this initiative is to create a system that can adapt dynamically to varying contexts by understanding and acting upon the intents of stakeholders in a decentralised and strategic manner. ... -
Spin representations and binary numbers
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)We consider a construction of the fundamental spin representations of the simple Lie algebras so(n) in terms of binary arithmetic of fixed width integers. This gives the spin matrices as a Lie subalgebra of a Z-graded associative algebra (rather than the usual N-filtered Clifford algebra). Our description gives a quick way to write down the spin matrices, and gives a way to encode some extra structure, ... -
Computing-Model and Computing-Hardware Selection for ICT under Societal and Judicial Constraints
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-18)This article discusses a formalization of aspects of Cyber-Sovereignty (CyS) for information and communication technology (ICT), linking them to technological trustworthiness and deriving an associated paradigm for hard- and software design. The upcoming 6G ICT standard is considered a keystone within modern society’s increasing interconnectedness and automatization, as it provides the ... -
On the Identification of the Dayside Auroral Region Using Incoherent Scatter Radar
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-22)This paper presents a robust method combining electron temperatures and density to identify the winter dayside auroral region in Incoherent Scatter Radar (ISR) observations. In literature, a common proxy for identifying the dayside auroral region has been enhanced electron temperatures T<sub>e</sub> at high altitudes. However, T<sub>e</sub> is intimately related to N<sub>e</sub> and their ... -
Towards the Best Solution for Complex System Reliability: Can Statistics Outperform Machine Learning?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-11)Studying the reliability of complex systems using machine learning techniques involves facing a series of technical and practical challenges, ranging from the intrinsic nature of the system and data to the difficulties in modeling and effectively deploying models in real-world scenarios. This study compares the effectiveness of classical statistical techniques and machine learning methods for ... -
Suspended nanophotonic waveguide for isotope-specific CO2 detection
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-11)The spectroscopic detection of gases and their stable isotopes holds significant value in bio-sciences and climate studies. However, achieving high precision has long been confined to bulky and costly equipment. In this work, we introduce a nanophotonic waveguide that is capable of detecting CO<sub>2</sub> gas down to 20 parts per billion, and for the first time perform accurate stable isotope ratio ... -
Ocean Surface Current Uncertainty Quantification via Drift Modeling and Spaceborne Retrieved Radial Velocities
(Doctoral thesis; Doktorgradsavhandling, 2025-01-29)Ocean surface current is an essential ocean state variable in operational oceanography. They govern the movement of pollutants, microorganisms, heat, and salt across the ocean. Their dynamics shape marine ecosystems and influence climate patterns. Monitoring and accurately predicting ocean surface currents are essential for managing offshore pollution and its potential impacts on the shoreline, ... -
Experimental and explainable machine learning approach on thermal conductivity and viscosity of water based graphene oxide based mono and hybrid nanofluids
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-28)This study explores the thermal conductivity and viscosity of water-based nanofluids containing silicon dioxide, graphene oxide, titanium dioxide, and their hybrids across various concentrations (0 to 1 vol%) and temperatures (30 to 60 °C). The nanofluids, characterized using multiple methods, exhibited increased viscosity and thermal conductivity compared to water, with hybrid nanofluids ... -
Static and dynamic stability of a polar ship in the arctic region with ice accumulation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-01-04)The harsh and complex marine environment of the Arctic region poses significant challenges for polar ships, particularly in cases where ice accumulates on ship surfaces, which can severely influence vessel stability. This study presents a comprehensive analysis of both static and dynamic stability for a polar ship subjected to ice accumulation, a topic of critical scientific importance and engineering ... -
Molecular-level characterization of supraglacial dissolved and water-extractable organic matter along a hydrological flow path in a Greenland Ice Sheet micro-catchment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-01-06)Sunlight penetrates the bare-ice surface of glaciers and ice sheets, giving rise to the presence of a three-dimensional porous matrix of partially melted ice crystals known as the weathering crust. Surface meltwater slowly percolates through this weathering crust, which hosts active and diverse bacterial communities, until it reaches a supraglacial stream. Despite the potential implications of ... -
The Upper Devonian to Lower Carboniferous Billefjorden Group on Bjørnøya, Svalbard, and Its North-Eastern Greenlandic Provenance
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-13)In this contribution, we document changes in detrital zircon ages in the upper Devonian (Famennian) to lower Carboniferous (Mississippian) Billefjorden Group on Bjørnøya, the southernmost island of Svalbard. This alluvial, coal-bearing clastic succession is widely distributed across the archipelago and the Barents Shelf. The sediments were deposited in subsidence-induced lowlands that formed just ... -
Recognizing Hand-Based Micro Activities Using Wrist-Worn Inertial Sensors: A Zero-Shot Learning Approach
(Chapter; Bokkapittel, 2024-10-23)Zero-shot learning (ZSL) is a machine learning paradigm that enables models to recognize and classify data from classes they have not encountered during training. This approach is particularly advantageous in recognizing activities where labeled data is limited, allowing models to identify new, unseen activities by leveraging semantic knowledge from seen activities. In this paper, we explore the ... -
Arctic Tectonics and Volcanism: a multi-scale, multi-disciplinary educational approach
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-16)Geologically, the Arctic is one of the least-explored regions of Earth. Obtaining data in the high Arctic is logistically, economically, and environmentally expensive, but the township of Longyearbyen (population of 2617 as of 2024) at 78° N represents a relatively easily accessible gateway to Arctic geology and is home to The University Centre in Svalbard (UNIS). These unique factors provide a ... -
The Effect of Speed Endurance Versus Core Training on The Repeated Sprint Ability of Youth Male Soccer Players – A Randomized Controlled Trial
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-01)The effects of specific training protocols to improve repeated sprint ability are well known; however, the utility of non-specific training for this purpose is doubtful. Therefore, this study aimed to compare the effects of a specific (sport-related) vs. non-specific (general physical development) eight-week training protocol on developing or maintaining repeated sprint ability in soccer players. ... -
The Microbiota of the Outer Gut Mucus Layer of the Migrating Northeast Arctic Cod (Gadus morhua) as Determined by Shotgun DNA Sequencing
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-31)Animals form functional units with their microbial communities, termed metaorganisms. Despite extensive research on some model animals, microbial diversity in many species remains unexplored. Here, we describe the taxonomic profile of the microbes from the outer gut mucus layer from the Northeast Arctic cod using a shotgun DNA sequencing approach. We focused on the mucus to determine if its microbial ...
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