Fakultet for naturvitenskap og teknologi: Recent submissions
Now showing items 2661-2680 of 5380
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Two-Photon Absorption Cross-Sections in Fluorescent Proteins Containing Non-canonical Chromophores Using Polarizable QM/MM
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-12)Multi-photon absorption properties, particularly two-photon absorption (2PA), of fluorescent proteins (FPs) have made them attractive tools in deep-tissue clinical imaging. Although the diversity of photophysical properties for FPs is wide, there are some caveats predominant among the existing FP variants that need to be overcome, such as low quantum yields and small 2PA cross-sections. From a ... -
MiMiC: Multiscale Modeling in Computational Chemistry
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-20)Hybrid quantum mechanics/molecular mechanics (QM/MM) approaches are commonly used methods for investigating a plethora of chemical, biochemical, and biophysical processes that require explicit treatment of the electronic degrees of freedom when the system is too big to be entirely treated by QM methods alone (Warshel and Levitt, 1976; Senn and Thiel, 2009; Adhireksan et al., 2014; Campomanes et al., ... -
Elevation changes of the Fennoscandian Ice Sheet interior during the last deglaciation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-20)The dynamics of ice sheet interiors during the last deglaciation are poorly constrained, hindering evaluation of ice sheet models. We provide direct evidence of Fennoscandian Ice Sheet (FIS) interior behaviour during deglaciation through surface exposure dating. Our results demonstrate early thinning of the FIS, prior to the Younger Dryas (YD, 12.8‐11.7 ka). Interior thinning in central Norway was ... -
Scalability of Distributed Version Control Systems
(Journal article; Tidsskriftartikkel, 2017-11-26)<p>Distributed version control systems are popular for storing source code, but they are notoriously ill suited for storing large binary files. <p>We report on the results from a set of experiments designed to characterize the behavior of some widely used distributed version control systems with respect to scaling. The experiments measured commit times and repository sizes when storing single files ... -
Getting adhesion force maps with an amplitude-modulation AFM in tapping mode
(Research report; Forskningsrapport, 2020-07)Here we demonstrate how to get adhesion force maps with an amplitude-modulation AFM in tapping mode. Our method is tapping mode but it is carried out at ultra-small amplitudes in the presence of surface water layers. The tip is made to vibrated under the water layer in what we call Small Amplitude Small Set-point AM AFM. We show how this is done with an example based on the Cypher scanning probe ... -
CMIP5 model selection for ISMIP6 ice sheet model forcing: Greenland and Antarctica
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-06)The ice sheet model intercomparison project for CMIP6 (ISMIP6) effort brings together the ice sheet and climate modeling communities to gain understanding of the ice sheet contribution to sea level rise. ISMIP6 conducts stand-alone ice sheet experiments that use space- and time-varying forcing derived from atmosphere–ocean coupled global climate models (AOGCMs) to reflect plausible trajectories for ... -
Reconstructing force profiles with an amplitude-modulation AFM in tapping mode
(Research report; Forskningsrapport, 2020-07)Here we demonstrate how to reconstruct force profiles with an amplitude-modulation AFM operated in in standard tapping mode. Our example is based on the Cypher scanning probe microscope from Asylum Research. The method is based on Sader and Katan’s algorithm, but we have implemented an experimental set-up that allows for robust reconstruction. We discuss the details here. -
Joint Invariants of Symplectic and Contact Lie Algebra Actions
(Master thesis; Mastergradsoppgave, 2020-06-23)By restricting generating functions of infinitesimal symmetries of symplectic and contact vector spaces to quadratic forms, we obtain a finite-dimensional Lie subalgebra, consisting of vector fields isomorphic to the linear symplectic or conformal symplectic algebra. This allows us to look for joint invariants of the diagonal action of g on product manifolds. We find an explicit recipe for creating ... -
Differential Invariants of Symplectic and Contact Lie Algebra Actions
(Master thesis; Mastergradsoppgave, 2020-06-23)In this thesis we consider the equivalence problem for symplectic and conformal symplectic group actions on submanifolds and functions. We solve the equivalence problem for general submanifolds by means of computing differential invariants and describing all the invariants of the associated group action by appealing to the Lie-Tresse theorem. -
μPyCSP - Two approaches to implementing CSP-like concurrency modeling in microcontrollers.
(Master thesis; Mastergradsoppgave, 2020-06-30)In this thesis, we have explored the possibility of bringing CSP-like concurrency modeling to an embedded environment. With the growth of IoT and embedded software, many of the hardships that come with concurrent coding in an inherently event-driven environment become more apparent. Convoluted and complex code is often used to handle the many fallacies of concurrency. We are solving this problem by ... -
Information collection for smart transportation nudges
(Master thesis; Mastergradsoppgave, 2020-06-25)Global climate change is becoming of increasing concern. Transportation makes up a large part of carbon gasses, which affects climate change and air quality. As transportation is a big part of carbon emissions, everybody can contribute to reducing emissions through transportation. One way for people to contribute is to start choosing greener transportation. Nuding is a tool that can be used to ... -
A Robot System for Personalized Language Education. Implementation and evaluation of a language education system built on a robot
(Master thesis; Mastergradsoppgave, 2020-06-29)As modern computer hardware becomes more affordable, the application areas of Artificial Intelligence (AI) expand and become more feasible to implement efficiently. This aspect opens up opportunities where AI robots can be used to support and improve many areas of human lives. One such area is education, and this thesis project combines AI and education to evaluate whether the results from that union ... -
Data collection and combination for smart nudges in physical activity
(Master thesis; Mastergradsoppgave, 2020-06-22)Denne masteroppgaven innhenter data fra forskjellige relevante kilder til fysisk aktivitet, og designer et smart nudging system. Oppgaven ser på hvordan dataen fra disse relevante kildene kan brukes av systemet til å påvirke adferden og motivasjonen til folk, så folk kan bli mere fysisk aktive. -
Storing and representing smart nudges in a user profile
(Master thesis; Mastergradsoppgave, 2020-06-19)Oppgaven handler om hvordan informasjon og struktur en bruker profil trenger for og og kunne lagre smart nudges, og bruke dette til og finne brukerens preferanser. Et design på brukerprofil er laget og dette designet er brukt for og implementere en brukerprofil som inneholder smart nudger. -
Multi-proxy approach to unravel methane emission history of an Arctic cold seep
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-13)Arctic Ocean sediments contain large amounts of methane in the form of free gas and gas hydrate. This highly dynamic methane reservoir is susceptible to be modified by bottom water warming. The warming may lead to gas hydrate destabilization releasing elevated methane fluxes to the seafloor and seawater. Reconstructing past methane dynamics can be achieved by using specific proxies left in the ... -
Automatic validation of Sentinel-1 borne snow avalanche detections
(Master thesis; Mastergradsoppgave, 2020-05-30)Snow avalanches threaten human lives, settlements and roads in snow covered mountainous areas. For avalanche forecasting, knowledge of the spatio-temporal occurrence of avalanche activity is critical. Automatic avalanche detection algorithms have been developed to enable consistent avalanche activity monitoring for large regions. The Satskred avalanche detection algorithm developed by NORCE applies ... -
Connecting the late Neoproterozoic flysch sedimentation in the Gariep Belt (Namibia) with its potential source region in southern Dom Feliciano Belt (Uruguay) – a U-Pb detrital and protolith zircon study.
(Master thesis; Mastergradsoppgave, 2020-06-22)The Dom Feliciano Belt in Uruguay represents a counterpart of the Gariep Belt in Namibia and these two belts are presently considered as relics of one orogen split by the Atlantic Ocean. In this study, two presumed flysch samples from the Marmora Terrane of the Gariep Belt in Namibia, and five samples from potential source areas in the Nico Perez Terrane of the Dom Feliciano Belt in Uruguay have ... -
Late Cenozoic development of the mid-Norwegian continental margin – a study of the Naust Formation based on 3D-seismic data
(Master thesis; Mastergradsoppgave, 2020-06-15)The late Cenozoic evolution of the outer continental shelf and slope on the northern part of the mid-Norwegian margin is studied using 3D seismic data. The late Cenozoic stratigraphy is subdivided into four main seismic units: unit A (oldest) to D and correlated to the established stratigraphic framework of the Naust Formation, where the oldest unit in this study correlates to the upper part of Naust ... -
Operationalising Critical Infrastructure Resilience. From Assessment to Management
(Doctoral thesis; Doktorgradsavhandling, 2020-09-03)Over recent decades, it has been evident that society relies heavily on critical infrastructures (CIs) to provide and maintain vital societal functions, such as water, electricity and transportation. Traditionally, in order to ensure the delivery of such functions, the focus has been on protecting the infrastructures’ systems from adverse and extreme events. However, large-scale events, such as ... -
Homogeneous Metal-Mediated Carboxylation with Carbon Dioxide
(Doctoral thesis; Doktorgradsavhandling, 2020-09-04)CO<sub>2</sub> is a non-toxic, abundant and readily available gas, which has the potential to become an important carbon source in chemical synthesis. The clear advantage of CO<sub>2</sub> is its sustainability, in contrast to typical carbon sources such as oil, coal, or natural gas, which are in the process of depletion. However, the use of CO<sub>2</sub> also poses a big challenge as it features ...