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Observation of Quasiperiodic Structures in the Hydroxyl Airglow on Scales Below 100 m
(Journal article; Peer reviewed, 2018)Gravity waves are known to transport energy and momentum to the middle atmosphere. The breaking processes associated with divergence of fluxes of energy and momentum into the atmosphere occur on scales that cannot be ... -
Observation of the boson peak in a two-dimensional material
(Peer reviewed; Journal article, 2023)The boson peak is an excess in the phonon vibrational density of states relative to the Debye model. It has been observed in a wide range of amorphous materials, from inorganic glasses to polymers. Two-dimensional random ... -
Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate
(Peer reviewed; Journal article, 2020)Application of scanning probe microscopy techniques such as piezoresponse force microscopy (PFM) opens the possibility to re‐visit the ferroelectrics previously studied by the macroscopic electrical testing methods and ... -
Observational evidence of the influence of Antarctic stratospheric ozone variability on middle atmosphere dynamics
(Journal article; Peer reviewed, 2015)Modeling results have suggested that the circulation of the stratosphere and mesosphere in spring is strongly affected by the perturbations in heating induced by the Antarctic ozone hole. Here using both mesospheric MF ... -
Observations of gravity wave forcing of the mesopause region during the January 2013 major Sudden Stratospheric Warming
(Journal article; Peer reviewed, 2014)Studies of vertical and interhemispheric coupling during Sudden Stratospheric Warmings (SSWs) suggest that gravity wave (GW) momentum flux divergence plays a key role in forcing the middle atmosphere, although observational ... -
Observations of nitric oxide in the Antarctic middle atmosphere during recurrent geomagnetic storms
(Journal article; Peer reviewed, 2013)We report ground-based measurements of the polar middle atmosphere made using a 230–250 GHz passive microwave radiometer deployed at Troll station (72°01′S 02°32′E, L shell of L = 4.8), Antarctica. Our observations show ... -
Observations of planetary waves in the mesosphere-lower thermosphere during stratospheric warming events
(Journal article; Peer reviewed, 2015-05-04)This study investigates the effect of stratospheric sudden warmings (SSWs) on planetary wave (PW) activity in the mesosphere–lower thermosphere (MLT). PW activity near 95 km is derived from meteor wind data using a chain ... -
OC2017 A-181 - Numerical modelling of (thin) oil films - Improved behaviour and life time of thin films in the OSCAR model
(Research report, 2017)The PETRO MAKS project "Formation and behaviour of thin oil films and evaluation of response methods including HSE", in the following short "Thin oil films" has the objective to achieve new knowledge more efficient and ... -
The occupied electronic structure of ultrathin boron doped diamond
(Peer reviewed; Journal article, 2020)Using angle-resolved photoelectron spectroscopy, we compare the electronic band structure of an ultrathin (1.8 nm) δ-layer of boron-doped diamond with a bulk-like boron doped diamond film (3 μm). Surprisingly, the measurements ... -
Octave-spanning Supercontinuum From As2S3-silica Double-nanospike Waveguide Pumped by Femtosecond Cr:ZnS Laser at 2.35 μm
(Chapter, 2015)We generate a 1.2 to 3.6 μm supercontinuum using a As2S3-silica double-nanospike waveguide pumped by femtosecond Cr:ZnS laser. Varying the core diameter allows the group velocity dispersion to be fine-tuned, thus maximizing ... -
Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl4 with crown ether alkalide
(Journal article; Peer reviewed, 2014)Blue-green luminescent octoxy capped Si nanoparticles were synthesized via homogeneous reduction of SiCl4 with the crown ether alkalide K+(15-crown-5)2K− in tetrahydrofuran. The Si nanoparticles were characterized with ... -
Odd-frequency superconductivity
(Journal article; Peer reviewed, 2019)This article reviews odd-frequency (odd-ω) pairing with focus on superconducting systems. Since Berezinskii introduced the concept of odd frequency order in 1974 it has been viewed as an exotic and rarely occurring in ... -
Oil dispersions of nano-layered silicates in an external electric field: An experimental study
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:218, Doctoral thesis, 2006)The work in this thesis concerned with the experimental study of structural morphologies and rheological properties of chains and/or- column like-structures of electrorheological (ER) fluids of 2:1 synthetic nano-layered ... -
Oil Spill Contingency and Response Modelling in Ice-Covered Waters
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On dark atoms, massive dark photons and millicharged sub-components
(Peer reviewed; Journal article, 2020)We present a simple model of two dark matter species with opposite millicharge that can form electrically neutral bound states via the exchange of a massive dark photon. If bound state formation is suppressed at low ... -
On determining the Poisson's ratio of viscoelastic polymer microparticles using a flat punch test
(Journal article; Peer reviewed, 2017)Microscopic spherical polymer particles are increasingly used in a wide range of areas, including pharmacy, physics and microelectronics. For most of the applications a precise knowledge of the mechanical properties is ... -
On Effective Degrees of Freedom in the Early Universe
(Journal article; Peer reviewed, 2016)We explore the effective degrees of freedom in the early Universe, from before the electroweak scale at a few femtoseconds after the Big Bang until the last positrons disappeared a few minutes later. We look at the established ... -
On functional imaging and treatment planning for biologically adapted radiotherapy
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:65, Doctoral thesis, 2012)Tumours show large variations in response to radiotherapy, both across tumour types and within individual tumours. One way to counteract radioresistance is to increase the radiation dose to resistant regions by so-called ... -
On intermetallic phases formed during interdiffusion between aluminium alloys and stainless steel
(Peer reviewed; Journal article, 2022)One of the major challenges in welding of aluminium (Al) alloys and steels is the growth of brittle intermetallic phases, which depends on the thermomechanical processing history and the alloying elements. This work focuses ... -
On Soot Sampling: Considerations when Sampling for TEM Imaging and Differential Mobility Spectrometer
(Journal article; Peer reviewed, 2019)Particulate matter (PM) has been sampled from a compression ignition engine using a differential mobility spectrometer (Cambustion DMS 500) and for imaging in a transmission electron microscope (TEM) with the aim of coupling ...