Blar i Fakultet for naturvitenskap (NV) på tittel
Viser treff 8040-8059 av 12667
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The O-factor: using the H-factor concept to predict the outcome of organosolv pretreatment
(Peer reviewed; Journal article, 2021)The H-factor, a parameter used extensively to analyze and predict the outcome of kraft pulping, is applied to organosolv pretreatment. The total solid yield after organosolv pretreatment fits well with the H-factor. The ... -
o-Quinonoid Heterocycles: Synthesis and Crystal Structure of 2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine
(Journal article; Peer reviewed, 2007)2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine (5), has been obtained as a minor product from reactions of S-nucleophiles with 5,6-di(1-bromoethyl)pyrazine-2,3- dicarbonitrile (3), or from a condensation of 4-hydroxy-2 ... -
Observasjon i kvantefysikk: Ein studie av elevforståingar
(Master thesis, 2018)Denne oppgåva er gjort i samband med forskings- og utviklingsprosjektet ReleKvant, som tek for seg elevar si forståing av moderne fysikk, og utviklar nettbaserte læringsressursar innan temaet som er tilpassa kompetansemål ... -
Observation in quantum physics: challenges for upper secondary physics students in discussing electrons as waves
(Journal article; Peer reviewed, 2019)Quantum physics is challenging for young students, but also a source of fascination. Observation is a key concept in order to understand how principles and experimental results in quantum physics differ from what we are ... -
Observation of a mesospheric front in a thermal-doppler duct over King George Island, Antarctica
(Journal article; Peer reviewed, 2011)A mesospheric front was observed with an all-sky airglow imager on the night of 9–10 July 2007 at Ferraz Station (62° S, 58° W), located on King George island on the Antarctic Peninsula. The observed wave propagated from ... -
Observation of cation-specific critical behavior at the improper ferroelectric phase transition in Gd2(MoO4)3
(Journal article; Peer reviewed, 2022) -
Observation of Electric-Field-Induced Structural Dislocations in a Ferroelectric Oxide
(Peer reviewed; Journal article, 2021)Dislocations are 1D topological defects with emergent electronic properties. Their low dimensionality and unique properties make them excellent candidates for innovative device concepts, ranging from dislocation-based ... -
Observation of magnetic state dependent thermoelectricity in superconducting spin valves
(Peer reviewed; Journal article, 2023)Superconductor-ferromagnet tunnel junctions demonstrate giant thermoelectric effects that are being exploited to engineer ultrasensitive terahertz radiation detectors. Here, we experimentally observe the recently predicted ... -
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 Ultrafast Intersystem Crossing in Thymine by Extreme Ultraviolet Time-Resolved Photoelectron Spectroscopy
(Journal article; Peer reviewed, 2019)We studied the photoinduced ultrafast relaxation dynamics of the nucleobase thymine using gas-phase time-resolved photoelectron spectroscopy. By employing extreme ultraviolet pulses from high harmonic generation for ... -
Observation of uncompensated bound charges at improper ferroelectric domain walls
(Journal article; Peer reviewed, 2019)Low-temperature electrostatic force microscopy (EFM) is used to probe unconventional domain walls in the improper ferroelectric semiconductor Er0.99Ca0.01MnO3 down to cryogenic temperatures. The low-temperature EFM maps ... -
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 lumpfish at a commercial fish farm during different water current conditions
(Master thesis, 2023)Lakselus (Lepeophteirus salmonis) er en av de største utfordringene for norsk havbruksnæring og ble beregnet til å føre med seg kostnader på rundt 6 milliarder NOK i 2019. Lakseoppdrettsnæringen bruker i dag rensefisk som ... -
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-029 - Vannkvalitet og startfôring av rognkjeks - Effekt av fôring med levende copepoder i tidlige faser (FHF prosjekt nr 901174)
(Research report, 2017)I oppdrett av rognkjeks benyttes fonnulert tønfor av små partikler fra start, som gir mye forspill i karene. Høy og varierende organisk belastning i systemet gir grobunn for oppblomstring av opportunistiske bakterier ... -
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 ...