Opin vísindi
Opin vísindi er varðveislusafn vísindaefnis og doktorsritgerða í opnum aðgangi á vegum íslenskra háskóla og Landsbókasafns Íslands - Háskólabókasafns.
Opinn aðgangur að rannsóknaniðurstöðum er í samræmi við 10. gr. laga nr. 3/2003 um opinberan stuðning við vísindarannsóknir sem og kröfur innlendra og erlendra rannsóknasjóða. Markmiðið með opnum aðgangi er að niðurstöður rannsókna séu aðgengilegar sem flestum óhindrað og án endurgjalds á rafrænu formi. Vistun í varðveislusafninu er varanleg og ætlað að tryggja aðgang að vísindaefni íslenskra háskóla í opnum aðgangi um ókomna tíð. Varðveislusafnið Opin vísindi er tengt við rannsóknagáttina IRIS og rannsóknaniðurstöður í opnum aðgangi sem eru skráðar í IRIS eru um leið vistaðar og gerðar aðgengilegar til framtíðar í varðveislusafninu. Með því að safna þessu efni saman í eitt safn verður aðgangur að því einfaldur og þægilegur fyrir alla sem vilja kynna sér það og geta þannig notið þess öfluga vísindastarfs sem fram fer í háskólum landsins.
Varðveislusafnið er OpenAIRE / OpenAIREplus samhæft og samrýmist kröfum sem gerðar eru um birtingu rannsóknaniðurstaðna úr verkefnum sem styrkt eru úr evrópsku rannsóknaáætlununum FP7 og H2020.
Varðveislusafnið notar opna hugbúnaðinn DSpace.
Opinn aðgangur að rannsóknaniðurstöðum er í samræmi við 10. gr. laga nr. 3/2003 um opinberan stuðning við vísindarannsóknir sem og kröfur innlendra og erlendra rannsóknasjóða. Markmiðið með opnum aðgangi er að niðurstöður rannsókna séu aðgengilegar sem flestum óhindrað og án endurgjalds á rafrænu formi. Vistun í varðveislusafninu er varanleg og ætlað að tryggja aðgang að vísindaefni íslenskra háskóla í opnum aðgangi um ókomna tíð. Varðveislusafnið Opin vísindi er tengt við rannsóknagáttina IRIS og rannsóknaniðurstöður í opnum aðgangi sem eru skráðar í IRIS eru um leið vistaðar og gerðar aðgengilegar til framtíðar í varðveislusafninu. Með því að safna þessu efni saman í eitt safn verður aðgangur að því einfaldur og þægilegur fyrir alla sem vilja kynna sér það og geta þannig notið þess öfluga vísindastarfs sem fram fer í háskólum landsins.
Varðveislusafnið er OpenAIRE / OpenAIREplus samhæft og samrýmist kröfum sem gerðar eru um birtingu rannsóknaniðurstaðna úr verkefnum sem styrkt eru úr evrópsku rannsóknaáætlununum FP7 og H2020.
Varðveislusafnið notar opna hugbúnaðinn DSpace.
Nýlega bætt við
Optimal field-free magnetization switching via spin-orbit torque on the surface of a topological insulator
(2025-12) Miranda, Ivan P.; Kwiatkowski, Grzegorz J.; Holmqvist, Cecilia M.; Canali, Carlo M.; Lobanov, Igor S.; Uzdin, Valery M.; Manolescu, Andrei; Bessarab, Pavel F.; Erlingsson, Sigurdur I.; Department of Engineering
We present an optimal field-free protocol for current-induced switching of a perpendicularly magnetized ferromagnetic insulator nanoelement on the surface of a topological insulator. The time dependence of in-plane components of the surface current, which drives the magnetization reversal via the Dirac spin-orbit torque with minimal Joule heating, is derived analytically as a function of the switching time and material properties. Our analysis identifies that energy-efficient switching is achieved for vanishing damping-like torque. The optimal reversal time that balances switching speed and energy efficiency is determined. When we compare topological insulators to heavy-metal systems, we find similar switching costs for the optimal ratio between the spin-orbit torque coefficients. However, topological insulators offer the advantage of tunable material properties. Finally, we propose a robust and efficient simplified switching protocol using a down-chirped rotating current pulse, tailored to realistic ferromagnetic/topological insulator systems.
Implementation of a multi-terminal quantum sorter in solid state systems
(2025-12) Preda, Amanda Teodora; Ghiu, Iulia; Ion, Lucian; Wulf, Ulrich; Manolescu, Andrei; Nemnes, George Alexandru; Department of Engineering
Identifying quantum states stands at the core of quantum information processing. However, an accurate observable measurement can pose a tough challenge whenever multiple outcomes are possible, e.g. measuring momentum vs. electron spin, which takes only two components. Quantum systems with a larger number of degrees of freedom increase the options for quantum computations and may enhance the quantum parallelism. Our goal in this work is to define a system that functions as a quantum sorter in a concrete manner, by choosing an interaction Hamiltonian that enables the device to separate the eigenstates into multiple output ports, achieving a so-called mode-lead disentanglement. To this end, we implemented numerically the -matrix formalism, which was developed to solve scattering transport problems in solid state systems. The states that are aimed to be separated are described by the transverse momentum of the incident modes and by their spin component, as a possible implementation of qudits. In order to achieve the desired resolution in terms of mode and spin, we study a range of possible Hamiltonians, corresponding to different configurations of the scattering potential.
Electronic Screening, Brief Intervention, and Referral to Treatment (e-SBIRT) for Gambling Harm : A Mixed-methods Acceptability Study
(2025-12) Wright, Simon; Smith, Jessica; Dighton, Glen; Quigley, Martyn; Dymond, Simon; Department of Psychology
Gambling harm is a significant public health burden, yet treatment uptake is low. Electronic screening, brief intervention, and referral to treatment (e-SBIRT) programmes have potential to increase uptake and improve treatment outcomes. However, no studies to date have investigated e-SBIRT in the context of gambling. We conducted a single-arm mixed-methods study of acceptability of e-SBIRT for gambling. Quantitative acceptability was indicated by users’ perceived satisfaction, impact and helpfulness of the e-SBIRT. Qualitative acceptability was explored using semi-structured interviews. Participants (n = 63), pre-screened for gambling severity, reported high levels of satisfaction with the e-SBIRT, found it helpful, and were more likely to seek treatment. Participants with higher gambling severity scores found the e-SBIRT more acceptable and were more likely to seek treatment following the intervention. Qualitative feedback (n = 7) supported the e-SBIRT’s acceptability. The present findings support the acceptability of e-SBIRT for gambling. Further research is required to refine the intervention and examine its effectiveness with those with gambling harm.
Infrared imaging used to observe the thermal response of the human skin to local cooling
(2025-11-30) Audunsson, Haraldur; Indridadottir, Lilja Bjork; Karlsson, Karl Ægir; Department of Engineering
Thermal imaging can provide novel data in laboratory exercises in physics and especially in quantitative physiology, for both quantitative analysis and modelling. In this paper we describe an exercise where the skin of the forearm is briefly cooled locally, the skin’s temperature recovery is observed with a thermal camera and the observations are analysed with the aid of simple thermal models. Although the thermal models applied are simple, they introduce several concepts from heat transfer and inspire quantitative modelling of the experimental data. The former model is very simple and is based on Newton’s law of cooling and it invites a second slightly more involved model including some analysis of heat transfer. The observed rate of temperature recovery is shown to be related to thermal properties of the skin and perfusion, and the experiment is a non-invasive measure of one aspect of the human thermoregulation. Thermal cameras are handy, they are becoming ever more accessible and can reveal novel insights when observing various physiological thermal process. This experiment may be of particular interest to students in health and biosciences that are taking undergraduate general physics courses and training data analysis.
SWOT Satellite Altimetry Observations and Source Model for the Tsunami from the 2025 M 8.8 Kamchatka Earthquake
(2025-11-26) Ruiz-Angulo, Angel; Melgar, Diego; de Marez, Charly; Deniau, Aurélien; Nencioli, Francesco; Hjörleifsdóttir, Vala; Department of Engineering
On 29 July 2025, an Mw 8.8 earthquake struck off Kamchatka, Russia, generating a Pacificwide tsunami and marking the largest earthquake since the launch of the surface water and ocean topography (SWOT) satellite in 2022. We analyze tsunami observations from SWOT together with three nearby deep-ocean assessment and reporting of tsunamis (DART) buoys to resolve the source of the event. SWOT provided the first high-resolution spaceborne track of a great subduction-zone tsunami, capturing waveforms that reveal complex propagation, dispersion, and scattering. Inversion of the DART time series using Gaussian unit sources shows that the rupture extended ∼400 km along strike, with peak uplift of ∼4 m, significantly different from the published finite-fault model. A blended source that combines the DART-inverted uplift with subsidence from the seismic–geodetic model best matches both datasets and reproduces the SWOT observations. Comparison with reconstructions of the 1952 Mw 9.0 Kamchatka earthquake indicates that the 2025 rupture likely reactivated significant portions of the megathrust that broke in 1952 but occurred farther down-dip and with little to no near-trench slip, consistent with its smaller tsunami impact. These findings highlight the hazard implications of short recurrence intervals of great earthquakes and show how rupture style governs tsunami severity. They also demonstrate the value of satellite altimetry for improving tsunami source characterization, post-event forecasting, and understanding of hydrodynamic processes.
Flokkar í Opnum vísindum
Veldu flokk til að skoða.
- University of Iceland
- University of Akureyri
- Bifröst University
- Hólar University College
- IRIS
- Agricultural University of Iceland
- National and University Library of Iceland
- Iceland University of the Arts