Viser treff 1-20 av 1825

• #### Photothermal conversion of biodegradable fluids and carbon black nanofluids ﻿

(Journal article; Peer reviewed, 2022)
The paper is devoted to the topic of direct absorption solar collectors (DASCs). Various kinds of fluids can be used as heat transfer fluid in DASCs, and the main focus of our paper is on comparing nanofluids (water with ...
• #### Photothermal convection of a magnetic nanofluid in a direct absorption solar collector ﻿

(Journal article; Peer reviewed, 2022)
Nanofluid-based direct absorption of solar heat results in thermal efficiencies superior to conventional solar thermal technology. In addition, convection of nanofluid can be sustained pump-free in the collector. In this ...
• #### Experimental investigation of erosion due to nanofluids ﻿

(Journal article; Peer reviewed, 2022)
The demand for efficient and sustainable energy is continuously increasing. Among the many technologies with great potential within this field are nanofluids. Nevertheless, there is still a considerable lack of information ...
• #### Comparative study on the uniform energy deposition achievable via optimized plasmonic nanoresonator distributions ﻿

(Journal article; Peer reviewed, 2022)
Plasmonic nanoresonators of core–shell composition and nanorod shape were optimized to tune their absorption cross-section maximum to the central wavelength of a short laser pulse. The number density distribution of randomly ...
• #### New, spherical solutions of non-relativistic, dissipative hydrodynamics ﻿

(Journal article; Peer reviewed, 2022)
We present a new family of exact solutions of dissipative fireball hydrodynamics for arbitrary bulk and shear viscosities. The main property of these solutions is a spherically symmetric, Hubble flow field. The motivation ...
• #### Experimental study of hydrogen production using electrolyte nanofluids with a simulated light source ﻿

(Journal article; Peer reviewed, 2022)
In this research, we conducted water electrolysis experiments of a carbon black (CB) based sodium sulfate electrolyte using a Hoffman voltameter. The main objective was to investigate hydrogen production in such systems, ...
• #### Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at √s=13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2022)
A search is presented for the production of a single top quark via left-handed flavour-changing neutral-current (FCNC) interactions of a top quark, a gluon and an up or charm quark. Two production processes are considered: ...
• #### Types of pulsating aurora: Comparison of model and EISCAT electron density observations ﻿

(Journal article; Peer reviewed, 2022)
Energetic particle precipitation associated with pulsating aurora (PsA) can reach down to lower mesospheric altitudes and deplete ozone. It is well documented that pulsating aurora is a common phenomenon during substorm ...
• #### Readout Electronics for the Upgraded ITS Detector in the ALICE Experiment ﻿

(Doctoral thesis, 2022-06-03)
ALICE is undergoing upgrades during the Long Shutdown (LS) 2 of the LHC to improve its performance and capabilities, and to prepare the experiment for the increases in luminosity provided by the LHC in Run 3 and Run 4. One ...
• #### Cutoff Latitudes of Solar Proton Events Measured by GPS Satellites ﻿

(Journal article; Peer reviewed, 2022)
Solar energetic particles (SEPs), one of the main causes of particle radiation in interplanetary space, can disrupt radio communication, induce spacecraft failures and change the heating and cooling rates in the atmosphere ...
• #### Quantitative Magnetic Resonance Imaging of Tissue Microvasculature and Microstructure in Selected Clinical Applications ﻿

(Doctoral thesis, 2022-06-03)
This thesis is based on four papers and aims to establish perfusion and diffusion measurements with magnetic resonance imaging (MRI) in selected clinical applications. While structural imaging provides invaluable geometric ...
• #### Problem solving in basic physics: Effective self-explanations based on four elements with support from retrieval practice ﻿

(Journal article; Peer reviewed, 2022)
Self-explanation, a learning strategy where students explain to themselves the steps taken in a worked example, is an effective learning strategy in early cognitive skill acquisition. However, many physics students produce ...
• #### Modelling of gas hydrates in sedimentary systems : Methane hydrates impact on flow through porous media ﻿

(Doctoral thesis, 2022-04-06)
In nature, gas hydrates exist in areas of permafrost and in shallow subsurface sediments at ocean depths of more than 300-500 metres. In terms of the Sustainable Development Goals (SDG) of the United Nations, better ...
• #### Efficient Monte Carlo simulation reveals significant multiple scattering errors in underwater angular scattering measurements ﻿

(Journal article; Peer reviewed, 2022)
Multiple scattering can severely affect the accuracy of optical instrumentation. Variance reduction methods have been implemented to improve a Monte Carlo model developed to simulate volume scattering functions measured ...
• #### Updated constraints on Z′ and W′ bosons decaying into bosonic and leptonic final states using the run 2 ATLAS data ﻿

(Journal article; Peer reviewed, 2021)
The full ATLAS run 2 dataset with a time-integrated luminosity of 139  fb−1 in the diboson and dilepton channels is used to probe benchmark models with extended gauge sectors: the E6-motivated grand unification models, the ...
• #### GPS Scintillations and TEC Variations in Association With a Polar Cap Arc ﻿

(Journal article; Peer reviewed, 2021)
A unique example of a polar cap arc producing clear amplitude and phase scintillations in GPS L-band signals is presented using observations from an all-sky imager and a GPS receiver and a digital ionosonde at Resolute Bay ...
• #### Energy dependence of ϕ meson production at forward rapidity in pp collisions at the LHC ﻿

(Journal article; Peer reviewed, 2021)
The production of $\phi$ mesons has been studied in pp collisions at LHC energies with the ALICE detector via the dimuon decay channel in the rapidity region $2.5< y < 4$. Measurements of the differential cross section ...
• #### Et kritisk og konstruktivt blikk på naturfaget i norsk skole ﻿

(Chapter, 2021)
Dette kapitlet retter et kritisk, men konstruktivt blikk på naturfag, og foretar en gjennomgang av naturfag og naturfagdidaktikk innen forskning og i praksis. Kapitlet starter med å beskrive og diskutere naturfagets ...
• #### High-latitude cold ion outflow inferred from the Cluster wake observations in the magnetotail lobes and the polar cap region ﻿

(Journal article; Peer reviewed, 2021)
Cold ions with low (a few eV) thermal energies and also often low bulk drift energies, dominate the ion population in the Earth’s magnetosphere. These ions mainly originate from the ionosphere. Here we concentrate on cold ...
• #### Search for resonances decaying into photon pairs in 139 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article, 2021)
Searches for new resonances in the diphoton final state, with spin 0 as predicted by theories with an extended Higgs sector and with spin 2 using a warped extra-dimension benchmark model, are presented using 139 fb−1 of √ ...