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norskFakultet for naturvitenskap og teknologi
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Crustal processes sustain Arctic abiotic gas hydrate and fluid flow systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-30)The Svyatogor Ridge and surroundings, located on the sediment-covered western flank of the Northern Knipovich Ridge, host extensive gas hydrate and related fluid flow systems. The fluid flow system here manifests in the upper sedimentary sequence as gas hydrates and free gas, indicated by bottom simulating reflections (BSRs) and amplitude anomalies. Using 2D seismic lines and bathymetric data, we ... -
On the relation between polarimetric synthetic aperture radar (SAR) features and sea ice melt pond fraction
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-12)In this study we examine the relationship between sea ice melt pond fraction and two polarimetric C-band synthetic aperture radar (SAR) features. Three high-resolution SAR scenes were recorded in the Fram Strait in late summer 2011, covering iceberg-fast first-year and old sea ice. In addition, melt pond fraction was retrieved from photographs recorded during a helicopter flight at the study area. ... -
Mapping sea-ice types from Sentinel-1 considering the surface-type dependent effect of incidence angle
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-23)Automated classification of sea-ice types in Synthetic Aperture Radar (SAR) imagery is complicated by the class-dependent decrease of backscatter intensity with Incidence Angle (IA). In the log-domain, this decrease is approximately linear over the typical range of space-borne SAR instruments. A global correction does not consider that different surface types show different rates of decrease in ... -
Ice extent in sub-arctic fjords and coastal areas from 2001 to 2019 analyzed from MODIS imagery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-03)Results examining variations in the ice extent along the Norwegian coastline based on the analysis of Moderate Resolution Imaging Spectroradiometer (MODIS) images from 2001 to 2019, February through May, are presented. A total of 386 fjords and coastal areas were outlined and grouped into ten regions to assess seasonal and long-term trends in ice extent. In addition, three fjords were examined to ... -
Added value of multitemporal polarimetric UAVSAR data for permanent scatterers detection
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-05)In the last decades, differential synthetic aperture radar (SAR) interferometric (InSAR) (DInSAR) techniques have been used to estimate the Earth's surface deformation with high resolution. In this paper, we present an approach for increasing the quantity of permanent scattered pixels. These pixels are selected for DInSAR processing based on polarimetric information prepared by new sensors. The ... -
Learning through joint Emergency Preparedness - A Case Study of a joint Industrial Safety and Emergency Preparedness System
(Master thesis; Mastergradsoppgave, 2015-06-29)The purpose of this study is to extend on scientific knowledge related to emergency preparedness, knowledge acquisition and learning within joint collaboration between industrial enterprises. There are limited researches that have been done when it comes to learning (singe and double lop learning) within safety science (Drupsteen and Guldenmund 2014). Further Ramli, Mokhtar & Aziz (2014) and Reiners ... -
The impact of system noise in polarimetric SAR imagery on oil spill observations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-16)The effects of both system additive and multiplicative noise on the X-, C-, and L-band synthetic aperture radar (SAR) data covering oil slicks are examined. Prior studies have attempted to characterize such oil slicks, primarily through analysis of polarimetric SAR data. In this article, we factor in system noise that is added to the backscattered signal, introducing artifacts that can easily be ... -
A generalized few-state model for the first hyperpolarizability
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-22)The properties of molecules depend on their chemical structure, and thus, structure–property relations help design molecules with desired properties. Few-state models are often used to interpret experimental observations of non-linear optical properties. Not only the magnitude but also the relative orientation of the transition dipole moment vectors is needed for few-state models of the non-linear ... -
Exploration of New Biomass-Derived Solvents: Application to Carboxylation Reactions
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-07)A range of hitherto unexplored biomass‐derived chemicals have been evaluated as new sustainable solvents for a large variety of CO<sub>2</sub>‐based carboxylation reactions. Known biomass‐derived solvents (biosolvents) are also included in the study and the results are compared with commonly used solvents for the reactions. Biosolvents can be efficiently applied in a variety of carboxylation reactions, ... -
User Expectations and Willingness to Share Self-collected Health Data
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020)The rapid improvement in mobile health technologies revolutionized what and how people can self-record and manage data. This massive amount of information accumulated by these technologies has potentially many applications beyond personal need, i.e. for public health. A challenge with collecting this data is to motivate people to share this data for the benefit of all. The purpose of this study is ... -
Semi-CNN architecture for effective spatio-temporal Learning in action recognition
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-12)This paper introduces a fusion convolutional architecture for efficient learning of spatio-temporal features in video action recognition. Unlike 2D convolutional neural networks (CNNs), 3D CNNs can be applied directly on consecutive frames to extract spatio-temporal features. The aim of this work is to fuse the convolution layers from 2D and 3D CNNs to allow temporal encoding with fewer parameters ... -
User Expectations and Willingness to Share Self-Collected Health Data
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020)The rapid improvement in mobile health technologies revolutionized what and how people can self-record and manage data. This massive amount of information accumulated by these technologies has potentially many applications beyond personal need, i.e. for public health. A challenge with collecting this data is to motivate people to share this data for the benefit of all. The purpose of this study is ... -
What Do We Know About the Use of Chatbots for Public Health?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020)<i>Background and objective</i>: The number of publications on the use of chatbots for health is recently increasing, however to our knowledge, there are no publications summarizing what is known about using chatbots for public health yet. The objective of this work is to provide an overview of the existing scientific literature on the use of chatbots for public health, for which purpose have chatbots ... -
The Compliance Challenges in Emissions Control Regulations to Reduce Air Pollution from Shipping
(Peer reviewed; Chapter; Bokkapittel, 2019-10-14)One of the thorny problems perplexing the maritime industry is to comply with existing and soon-to-be-enacted regulations towards emissions reduction from shipping. This problem has been discussed in this study under three viewpoints: i) the marine engine efficiency, ii) the decision-making process for selecting the technologies for reducing air emissions from shipping and iii) the challenges in the ... -
Homogeneous Levi non-degenerate hypersurfaces in C^3
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-09)We classify all (locally) homogeneous Levi non-degenerate real hypersurfaces in C<sup>3</sup> with symmetry algebra of dimension ≥6. -
Formal C-H carboxylation of unactivated arenes with carbon dioxide
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-31)A formal C−H carboxylation of unactivated arenes using CO<sub>2</sub> in green solvents is described. The present strategy combines a sterically controlled Ir‐catalyzed C−H borylation followed by a Cu‐catalyzed carboxylation of the in situ generated organoboronates. The reaction is highly regioselective for the C−H carboxylation of 1,3‐disubstituted and 1,2,3‐trisubstituted benzenes, 1,2‐ or ... -
Higher Weight Spectra of Veronese Codes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-18)We study q-ary linear codes C obtained from Veronese surfaces over finite fields.We show how one can find the higher weight spectra of these codes, or equivalently, the weight distribution of all extension codes of C over all field extensions of the ground field. Our methods will be a study of the Stanley-Reisner rings of a series of matroids associated to each code C. -
Sampling moiré method: a tool for sensing quadratic phase distortion and its correction for accurate quantitative phase microscopy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-24)The advantages of quantitative phase microscopy (QPM) such as label-free imaging with high spatial sensitivity, live cell compatibility and high-speed imaging makes it viable for various biological applications. The measurement accuracy of QPM strongly relies on the shape of the recorded interferograms, whether straight or curved fringes are recorded during the data acquisition. Moreover, for a ... -
Anthropocene rockfalls travel farther than prehistoric predecessors
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-02)Human modification of natural landscapes has influenced surface processes in many settings on Earth. Quantitative data comparing the distribution and behavior of geologic phenomena before and after human arrival are sparse but urgently required to evaluate possible anthropogenic influences on geologic hazards. We conduct field and imagery-based mapping, statistical analysis, and numerical modeling ... -
Automatic fringe pattern enhancement using truly adaptive period-guided bidimensional empirical mode decomposition
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-19)Fringe patterns encode the information about the result of a measurement performed via widely used optical full-field testing methods, e.g., interferometry, digital holographic microscopy, moiré techniques, structured illumination etc. Affected by the optical setup, changing environment and the sample itself fringe patterns are often corrupted with substantial noise, strong and uneven background ...
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