Fakultet for naturvitenskap og teknologi: Nye registreringer
Viser treff 2101-2120 av 5378
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Life in Anticipation of the COVID-19 Pandemic ‘Peak’: Reflecting on ‘Strategies’ for and Variations in attempts at ‘Flattening the Curve’ and Managing the Crisis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-08)On March 11th, 2020, the World Health Organization (WHO) declared the emerging COVID-19 threat a pandemic following the global spread of the virus. As countries around the world implemented emergency measures in a concerted effort to handle the emerging pandemic, the nature and implications of the different kinds of precautionary measures adopted have remained contested. The majority of countries ... -
Improved Buchwald–Hartwig Amination by the Use of Lipids and Lipid Impurities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-25)The development of green Buchwald–Hartwig aminations has long been considered challenging, due to the high sensitivity of the reaction to the environment. Here we show that food-grade and waste vegetable oils, triglycerides originating from animals, and natural waxes can serve as excellent green solvents for Buchwald–Hartwig amination. We further demonstrate that amphiphiles and trace ingredients ... -
The origin of driftwood on eastern and south-western Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-02)The Arctic is one of the regions where the effect of global change is most evident. Associated with warming are changes in snow, sea ice and hydroclimate, all which have significant impacts on environments and society. However, due to short observational records, it is difficult to set the current climate in a long-term context. Arctic driftwood (DW), available throughout the Holocene, is a paleoclimate ... -
Integration of HelseID with Third-Party Role Assignments Data
(Master thesis; Mastergradsoppgave, 2021-08-31)The Norwegian healthcare sector is vast, with a substantial number of organizations employing plenty of people, and thereof, 7,300 are customers of Norsk Helsenett. Maintaining and keeping up-to-date information about access rights for these customers is a difficult, time-consuming, and manual task, especially since organizations often change personnel without notifying the system administrators. ... -
Locating potential sources of capacity and vulnerability in geographically remote areas: Reflections based on three case studies
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-02)The relationship between geographical and social forms of remoteness and the concepts of vulnerability and capacity remains unclear. Recognising that capacities and vulnerabilities tend to co-exist in a population, the article assumes that the dynamics between these concepts are situational. In this article we draw on three cases to analyse the issue. An Arctic case study provides insight on remoteness ... -
How to use an app to Nudge people to choose more green transportation?
(Mastergradsoppgave; Master thesis, 2021-10-02)Making green transport choices are more important than ever to save the environment. To accomplish this there must be a reduction in emissions of greenhouse gases and other pollutants. How to make people choose green transportation, when it is inconvenient, is an interesting challenge. Most would rather take the easy way out to avoid the extra planning and estimation of how to reach their destination. ... -
Slicer
(Mastergradsoppgave; Master thesis, 2021-09-15)Explorative data visualization is a widespread tool for gaining insights from datasets. Investigating data in linked visualizations lets users explore potential relationships in their data at will. Furthermore, this type of analysis does not require any technical knowledge, widening the userbase from developers to anyone. Implementing explorative data visualizations in web browsers makes data analysis ... -
Combination of satellite imagery and wind data in deep learning approach to detect oil spills
(Mastergradsoppgave; Master thesis, 2021-09-15)The ocean is vulnerable to oil related activities such as oil production and transport that can harm the environment. Environmental damages from oil spills can be large if not dealt with. Satellite images from radar are useful to detect oil spills because they cover both day and night and penetrates clouds. However, detecting oil spills in ocean areas from satellite images are not a trivial task due ... -
Impacts of snow data and processing methods on the interpretation of long-term changes in Baffin Bay early spring sea ice thickness
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-21)In the Arctic, multi-year sea ice is being rapidly replaced by seasonal sea ice. Baffin Bay, situated between Greenland and Canada, is part of the seasonal ice zone. In this study, we present a long-term multi-mission assessment (2003–2020) of spring sea ice thickness in Baffin Bay from satellite altimetry and sea ice charts. Sea ice thickness within Baffin Bay is calculated from Envisat, ... -
Halogen Bonding: An Odd Chemistry?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-03)Halogen bonding is a flourishing field of research, but has for long been little recognized. The same goes for its scientific hero, Odd Hassel, who laid the foundations for all current developments. The crystallographic observation of halogen−oxygen interatomic distances shorter than the sum of the van der Waals radii of the involved atoms, and the interpretation of this phenomenon as a charge-transfer ... -
Smart contract formation enabling energy-as-a-service in a virtual power plant
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-22)Energy as a service (EaaS) is an emerging business model that enables the otherwise passive energy consumers to play an active role and participate in the energy utility services. This platform is formed through smart contracts registering peer-to-peer (P2P) transactions of energy through price and quantity. Many industries, including finance, have already leveraged smart contracts to introduce ... -
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-12)An earthquake sequence in the Storfjorden offshore area southwest of Spitsbergen in the Svalbard archipelago initiated with a 21 February 2008 magnitude <i><b>M</i></b><sub><b>w</sub></b> 6.1 event. This area had previously not produced any significant earthquakes, but between 2008 and 2020, a total of ∼<b>2800</b> earthquakes were detected, with ∼<b>16</b> of them being of moderate size ... -
Radio wave propagation through the ionosphere
(Doctoral thesis; Doktorgradsavhandling, 2021-11-24)The non-transient plasma that is closest to Earth is found in the ionosphere at altitudes above approximately 60 km. It is observed either by ground-based, in-situ, or space-borne instrumentation and utilized to study and determine plasma phenomena and dynamics and the near-Earth space. Through active modification experiments, transmitting high-power, high-frequency radio waves into the ionospheric ... -
Time series cluster kernels to exploit informative missingness and incomplete label information
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-20)The time series cluster kernel (TCK) provides a powerful tool for analysing multivariate time series subject to missing data. TCK is designed using an ensemble learning approach in which Bayesian mixture models form the base models. Because of the Bayesian approach, TCK can naturally deal with missing values without resorting to imputation and the ensemble strategy ensures robustness to hyperparameters, ... -
Proactive Collision Avoidance for Autonomous Ships: Leveraging Machine Learning to Emulate Situation Awareness
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021)Autonomous ship technology is developing at a rapid pace, with the aim of facilitating safe ship operations. Collision avoidance is one of the most critical tasks that autonomous ships must handle. To support the level of safety associated with collision avoidance, this study suggests to provide autonomous ships with the ability to conduct proactive collision avoidance maneuvers. Proactive collision ... -
Algebraforståelse blant studentene i brukerkurs i matematikk ved UiT
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-24)Ved Institutt for matematikk og statistikk UiT – Norges arktiske universitet ble Brukerkurset i matematikk høsten 2020 lagt om til et prosjektbasert emne og ny eksamensform med avsluttende muntlig gruppeeksamen. Et av målene for vår studie er å kartlegge ferdigheter og forståelse i algebra i begynnelsen av semesteret og hvordan studentene videre møter de algebraiske aktivitetene i prosjektene. I ... -
Hyperspectral image classification based on a shuffled group convolutional neural network with transfer learning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-01)Convolutional neural networks (CNNs) have been widely applied in hyperspectral imagery (HSI) classification. However, their classification performance might be limited by the scarcity of labeled data to be used for training and validation. In this paper, we propose a novel lightweight shuffled group convolutional neural network (abbreviated as SG-CNN) to achieve efficient training with a limited ... -
The effect of temperature and digested sewage sludge cover over tailings on the leaching of contaminants from Ballangen tailings deposit
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-28)Dry covers can be applied above tailings to reduce and prevent formation of acid mine drainage and leaching of contaminants. Efficiency of covers is affected by different parameters, of which temperature change under climate change context is one. Here, a laboratory column leaching experiment was performed under four temperatures, 5, 10, 14, and 18 °C on unoxidized tailings from Ballangen, Norway. ... -
Nature of the copper-nitrosyl intermediates of copper nitrite reductases during catalysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-20)The design and synthesis of copper complexes that can reduce nitrite to NO has attracted considerable interest. They have been guided by the structural information on the catalytic Cu centre of the widespread enzymes Cu nitrite reductases but the chemically novel side-on binding of NO observed in all crystallographic studies of these enzymes has been questioned in terms of its functional relevance. ... -
IRON-MAN: An Approach to Perform Temporal Motionless Analysis of Video Using CNN in MPSoC
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-20)This paper proposes a novel human-inspired methodology called IRON-MAN (Integrated RatiONal prediction and Motionless ANalysis) for mobile multi-processor systems-on-chips (MPSoCs). The methodology integrates analysis of the previous image frames of the video to represent the analysis of the current frame in order to perform Temporal Motionless Analysis of the Video (TMAV). This is the first work ...