Fakultet for naturvitenskap og teknologi: Nye registreringer
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Adaptive Kalman Filter-based Estimator with Sea Trail Data to Calculate Ship States in Complex Navigation Conditions
(Chapter; Bokkapittel, 2024)With the progress of innovative technologies, ships in future with different autonomy levels are anticipated to enter the realm of maritime transportation. As a result, the scenarios of multi-ship encounters at sea can become more complex and the risk of potential collisions can be difficult to elevate. To support navigation safety and guarantee the required situation awareness level, it is ... -
Operational support framework for maritime autonomous surface ships under onshore operation centers
(Chapter; Bokkapittel, 2024-05-08)In recent years, the concept of Maritime Autonomous Surface Ships (MASSs) has gotten attention both from the research community and shipping industry. The recent development in advanced sensing, communication, and control technologies makes it possible to operate such vessels remotely through Onshore Operation Centers (OOCs). However, there are still several challenges that need to be addressed ... -
Navigational support framework for maritime autonomous surface ships under onshore operation centers
(Chapter; Bokkapittel, 2024-05-08)To navigate, Maritime Autonomous Surface Ships (MASSs) must be able to determine their states. i.e., the positions and velocities, etc., by utilizing onboard IoT, and ship intelligence systems. Autonomous ship navigation can heavily rely on machine learning algorithms that can predict how vessels will maneuver in the future, based on past behavior, where vessel state estimation can play a main role. ... -
Functional Requirements for Onshore Operation Centers to Support Remotely Operated Ships
(Chapter; Bokkapittel, 2024-06-16)Autonomous shipping has received extensive attention from the maritime industry as well as the respective research, academic and training institutes, owing to its major benefits related to cost and safety over traditional shipping in many situations. In reality, the implementation of autonomous technology in shipping can face numerous challenges from the technology and regulatory perspectives. ... -
Study of Maritime Autonomous Surface Ships (MASS) Trustworthiness: Hardware Point of View
(Chapter; Bokkapittel, 2024-06-16)Nowadays, the maritime industry, like other industries, is incorporating Machine Learning (ML) and Artificial Intelligence (AI) approaches in their applications. Since the rise of Maritime Autonomous Surface Ships (MASS) is on the horizon, such intelligent algorithms would replace conventional ship navigation with a higher level of autonomy. In other words, a digital navigator can be developed based ... -
Skibotn Astrofysiske Observatorium. Et forsøk på å innføre observasjonsastrofysikk i Norge 1971 - 2002 - Og hvordan det gikk etterpå.
(Book; Bok, 2024)I forbindelse med etableringen av Universitetet i Tromsø ble det undersøkt om det var gode nok forhold for infrarøde astrofysiske observasjoner i lange, kalde vinternetter i Indre Troms. Mest klarvær om vinteren fant vi i ytre del av Skibotndalen. Fjellet Addjet (1405 m.o.h) ble i 1974 foreslått som sted for observatorium. Dette ble imidlertid vurdert for krevende og kostbart. Det ble i stedet vedtatt ... -
An evolution in sustainable development: Integrating new semi-quantitative assessment model with strategic management (Insights from the mineral sector)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-18)Sustainable development is crucial for ensuring the future of the environment, humanity, and industries. As a result, researchers across various disciplines have sought to expand sustainable practices within their fields. Since its introduction in 1992, sustainable development has made significant progress. Numerous models have been developed to assess sustainable development levels, with ... -
Arctic freshwater outflow suppressed Nordic Seas overturning and oceanic heat transport during the Last Interglacial
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-27)The Last Interglacial period (LIG) was characterized by a long-term Arctic atmospheric warming above the preindustrial level. The LIG thus provides a case study of Arctic feedback mechanisms of the cryosphere-ocean circulation-climate system under warm climatic conditions. Previous studies suggested a delay in the LIG peak warming in the North Atlantic compared to the Southern Ocean and evoked the ... -
The effect of spatial resolution on the in-cloud atmospheric icing conditions in numerical weather model at the Fargernes mountain, Norway
(Chapter; Bokkapittel, 2024-06)Atmospheric icing poses significant risks to infrastructure, aviation, and the energy section. Numerical weather models, as the Weather Research and Forecasting model (WRF), can be used to describe the atmospheric conditions relevant for atmospheric icing. In this study, we will focus on the Fagernes mountain meteorological icing measurement site where the WRF model is set up using ERA5 input data, ... -
Atmospheric In-cloud Icing Using WRF for an Alpine Wind Power Plant in Norway
(Chapter; Bokkapittel, 2024-06)Troms Kraft have identified a location in Kvænangen, Norway, for a new wind power plant with promising wind resources. However, the site is in an arctic climate with mountainous terrain exposed to severe icing conditions. Assessments of icing conditions at proposed locations for new wind power plants in areas exposed to icing is crucial to identifying icing related challenges. This paper investigates ... -
A Peridynamic Approach to Simulate Sea Ice Fracture with a Focus on its time-dependent material behaviour
(Chapter; Bokkapittel, 2024)Sea ice exhibits time-dependent non-linear behaviour. This is evidenced by both lab and field experiments with known phenomena such as creep and stress relaxation. This time-dependent material behaviour becomes particularly pronounced at larger temporal scales. In this study, we present a novel approach to simulate time-dependent fractures in sea ice using peridynamics (PD), a particle integral ... -
In-network monitoring strategies for HPC cloud
(Conference object; Konferansebidrag, 2024)The optimized network architectures and interconnect technologies employed in high-performance cloud computing environments introduce challenges when it comes to developing monitoring solutions that effectively capture relevant network metrics. Moreover, network monitoring often involves capturing and analyzing a large volume of network traffic data. This process can introduce additional overhead ... -
Integrating ROV MBES and photogrammetry data for comprehensive mapping of cold seep systems at Hakon Mosby Mud Volcano (HMMV) in the Barents Sea
(Conference object; Konferansebidrag, 2024-07) -
Snow on sea ice
(Chapter; Bokkapittel, 2023-08-01)The overlying snow cover on sea ice has a profound influence on what lies below. Being both highly optically reflective and thermally insulating, the snow influences the rate and timing with which the sea ice grows and melts seasonally. The shade introduced by the snow radically reduces the light intensity in and under the ice, affecting which organisms can survive there and how active they can be. ... -
Computational Approach to Molecular Reactivity of Transition Metal Complexes
(Doctoral thesis; Doktorgradsavhandling, 2024-10-25)<p>Transition metal (TM) catalysts are indispensable in industrial operations and organic synthesis due to their unique properties, such as variable oxidation states, rich coordination chemistry, and ability to enable electron transfer processes. These properties allow them to activate a diverse range of substrates by lowering activation energies, and the catalysts can be fine-tuned to enhance chemo-, ... -
Nickel Catalyzed Carbonylative Cross Coupling for Direct Access to Isotopically Labeled Alkyl Aryl Ketones
(Journal article; Tidsskriftartikkel, 2024-08-15)Here we present an effective nickel-catalyzed carbonylative cross-coupling for direct access to alkyl aryl ketones from readily accessible redox-activated tetrachlorophthalimide esters and aryl boronic acids. The methodology, which is run employing only 2.5 equivalents of CO and simple Ni(II) salts as the metal source, exhibits a broad substrate scope under mild conditions. Furthermore, this ... -
Assessing the Transferability of Neural Network-Based Sea Ice Classification between the Arctic and Antarctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-05)In this study, we trained a supervised neural network for sea ice classification using X-band SAR images obtained during an Antarctic fieldwork campaign and applied it to Arctic X-band data acquired during sea ice fieldwork campaigns. The results revealed a pronounced correlation between the predicted sea ice class and measured snow depth in the Arctic. This correlation is likely attributed to the ... -
On the use of the polarization difference to separate young from deformed sea ice in L- and C-band SAR
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-05)Separation between deformed sea ice and high-backscatter young ice (YI) areas is one of the remaining challenges for automatic classification of sea ice types in synthetic aperture radar (SAR) images. While high-backscatter areas are usually interpreted and classified as deformed sea ice or multi-year ice, they may at times be new ice or YI areas with a rough surface due to frost flowers, snow crusts, ... -
In-hospital Mortality, Readmission, and Prolonged Length of Stay Risk Prediction Leveraging Historical Electronic Patient Records
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-14)Objective - This study aimed to investigate the predictive capabilities of historical patient records to predict patient adverse outcomes such as mortality, readmission, and prolonged length of stay (PLOS).<p> <p>Methods - Leveraging a de-identified dataset from a tertiary care university hospital, we developed an eXplainable Artificial Intelligence (XAI) framework combining tree-based and ... -
Exploring Pain Reduction through Physical Activity: A Case Study of Seven Fibromyalgia Patients
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-29)Fibromyalgia is a chronic disease that affects a considerable fraction of the global population, primarily women. Physical activity is often recommended as a tool to manage the symptoms. In this study, we tried to replicate a positive result of pain reduction through physical activity. After collecting pain and physical activity data from seven women with fibromyalgia, one patient experienced ...