Fakultet for naturvitenskap og teknologi: Nye registreringer
Viser treff 461-480 av 5444
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Generating and grading 34 optimised norm-conserving Vanderbilt pseudopotentials for actinides and super-heavy elements in the PseudoDojo
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-07)In the last decades, material discovery has been a very active research field driven by the need to find new materials for many different applications. This has also included materials with heavy elements, beyond the stable isotopes of lead, as most actinides exhibit unique properties that make them useful in various applications. Furthermore, new heavy elements beyond actinides, collectively referred ... -
Tinned: A symbolic library for response theory and high-order derivatives
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-23)A symbolic C++ library—Tinned—has been developed for symbolic differentiation and manipulation in response theory. By recognizing different key building blocks in the density matrix-based (Thorvaldsen et al., J. Chem. Phys. 2008, 129, 214108) and coupled-cluster response theories, we have implemented their corresponding C++ symbolic classes, including but not limited to one- and two-electron ... -
pNNCLR: Stochastic pseudo neighborhoods for contrastive learning based unsupervised representation learning problems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-11)Nearest neighbor (NN) sampling provides more semantic variations than predefined transformations for selfsupervised learning (SSL) based image recognition problems. However, its performance is restricted by the quality of the support set, which holds positive samples for the contrastive loss. In this work, we show that the quality of the support set plays a crucial role in any nearest neighbor based ... -
Long-term performance evaluation of VCRS-based atmospheric water generation in arid climates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-14)The paper evaluates the EW-1000 Atmospheric Water Generation-Vapor Compression Refrigeration system (AWG-VCRS) as a sustainable alternative to seawater desalination in the GCC. Conducted in Masdar City, Abu Dhabi, from July 2023 to January 2024, the study measured temperature, humidity, energy consumption, and water production. Key findings include a peak water production of 1500 LPD in September ... -
Data note for gender perspectives on a flipped classroom environment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-20)The present paper is a data note related to the paper “Gender perspectives on a flipped classroom environment”. The paper drew on an in-depth analysis of the interview with a single female student called Sofia and attempted to analyze different gender related interactions between students in group work situations experienced by this student. The transcript from this interview was translated from ... -
Using One App Only – Collecting a Comprehensive Set of Health-Related Data for Prevention of Chronic Conditions
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)This paper presents the design, implementation and early tests of an app that collects a comprehensive set of health-related data, as part of the EU-project WARIFA. To achieve the main aim of the project – using AI to prevent chronic conditions – a wide range of data needs to be collected and stored at a backend server for processing. The methods and elements for creating this system are presented, ... -
Control-Driven Media: A Unifying Model for Consistent, Cross-platform Multimedia Experiences
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)Many media providers offer complementary prod-ucts on different platforms to target a diverse consumer base. Online sports coverage, for instance, may include professionally produced audio and video channels, as well as Web pages and native apps offering live statistics, maps, data visualizations, social commentary and more. Many consumers also engage in parallel usage, setting up streaming products ... -
Metallogenic model of the Lykling ophiolite-hosted lode Au deposit, Scandinavian Caledonides: Insight from fluid inclusions, mineral chemistry and stable isotope geochemistry
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-10)The Lykling lode Au deposit represents a unique example of gold mineralization in the Upper Allochthone of the Scandinavian Caledonides. The mineralization is hosted by the Early Ordovician Lykling Ophiolite Complex and the intruding trondhjemite unit and spatially associated with two generations of mafic dykes that crosscut both the ophiolitic complex and trondhjemite. Field observations indicate ... -
Droplet characterization of a pressure-swirl atomizer by means of high-fidelity modelling based on DNS simulations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-31)Liquid injection optimization is key to enhance the efficiency of many processes in a wide variety of fields. Combustion processes are one of the most challenging ones, due to the direct emissions and greenhouse gases implications. This work aims at studying the external two-phase flow produced when injecting fuel with a pressure-swirl atomizer in an operating condition typical of an academic ... -
Statistikk, Sannsynlighet og Kombinatorikk i Norske Læreplaner for Grunnskolen-En dokumentanalyse av læreplaner fra 1739 til 2020
(Mastergradsoppgave; Master thesis, 2024-08-15)Denne kvalitative dokumentanalysen tar for seg 21 lærerplaner mellom år 1739 og 2020. Hensikten er å finne ut hvordan statistikk, sannsynlighet og kombinatorikk har kommet til uttrykk i norske læreplaner for grunnskolen. Dokumentanalyse foretok seg alle læreplaner/lover som hadde en innvirkning på grunnskolen eller tilsvarende alder før grunnskolens eksistens. Kun de 6 siste læreplanene for ... -
Presisjons fotometri ved Skibotn observatorium
(Master thesis; Mastergradsoppgave, 1996-12-17)Denne oppgaven viser at det er mulig å gjøre differensiell fotometri av ∂-Scuti stjerner med rimelig god presisjon ved Skibotn observatorium. Den høyeste presisjonen som ble oppnådd i C1-C2 var 28 mmag. Sammenligningen av den beste natten fra Skibotn med en god natt fra FG Vir kampanjen (året før) viser at muligheten er til stede for å oppnå gode resultater. En bekreftelse på dette fikk vi da to av ... -
Effects of plasma resistivity in FELTOR simulations of three-dimensional full-F gyro-fluid turbulence
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-18)A full-F, isothermal, electromagnetic, gyro-fluid model is used to simulate plasma turbulence in a COMPASS-sized, diverted tokamak. A parameter scan covering three orders of magnitude of plasma resistivity and two values for the ion to electron temperature ratio with otherwise fixed parameters is setup and analysed. Two transport regimes for high and low plasma resistivities are revealed. Beyond ... -
Combinatorial mutations of Gelfand–Tsetlin polytopes, Feigin–Fourier–Littelmann–Vinberg polytopes, and block diagonal matching field polytopes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-19)The Gelfand-Tsetlin and the Feigin–Fourier–Littelmann–Vinberg polytopes for the Grassmannians are defined, from the perspective of representation theory, to parametrize certain bases for highest weight irreducible modules. These polytopes are Newton-Okounkov bodies for the Grassmannian and, in particular, the GT polytope is an example of a string polytope. The polytopes admit a combinatorial ... -
Variations in deep-sea methane seepage linked to millennial-scale changes in bottom water temperatures ~ 50–6 ka, NW Svalbard margin
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-27)During the last glaciation, the northern hemisphere experienced profound millennial-scale changes (termed Dansgaard-Oeschger (DO) events) in atmospheric and oceanic temperatures. In the North Atlantic, the fluctuations resulted in extremely unstable bottom water conditions with bottom water temperatures (BWT) varying up to > 5 °C. We have studied these changes in a core from 1,300 m water depth ... -
Combination of separation and degradation methods after PFAS soil washing
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-26)The current study evaluated a three-stage treatment to remediate PFAS-contaminated soil. The treatment consisted of soil washing, foam fractionation (FF), and electrochemical oxidation (EO). The possibility of replacing the third stage, i.e., EO, with an adsorption process was also assessed. The contamination in the studied soils was dominated by perfluorooctane sulfonate (PFOS), with a concentration ... -
Inverse Hypercorroles
(Journal article; Tidsskriftartikkel, 2024-05-02)Ground-state and time-dependent density functional theory (TDDFT) calculations with the long-range-corrected, Coulomb-attenuating CAMY-B3LYP exchange-correlation functional and large, all-electron STO-TZ2P basis sets have been used to examine the potential “inverse hypercorrole” character of meso-p-nitrophenyl-appended dicyanidocobalt(III) corrole dianions. The effect is most dramatic for ... -
Tulvat ja tulvasuojelu: esimerkkinä pohjalaismaakuntien kevät 2024
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-17) -
Uncertainty analysis of Altantic salmon fish scale's acoustic impedance using 30 MHz C-Scan measurements
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-06)Understanding the biomechanics of fish scales is crucial for their survival and adaptation. Ultrasonic Cscan measurements offer a promising tool for non-invasive characterization, however, existing literature lacks uncertainty analysis while evaluating acoustic impedance. This article presents an innovative integration of uncertainty into the analytical framework for estimating stochastic specific ... -
Statistical Studies of Plasma Structuring in the Auroral Ionosphere by the Swarm Satellites
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-11)This study uses over 2 years of 16 Hz density measurements, 50 Hz magnetic field data and ROTI data from the Swarm mission to perform long term statistics of plasma structuring in the polar ionosphere. The timeframe covers more than 2 years near the 24th solar cycle peak. We additionally use 3 years of data obtained from a timeframe close to solar minimum for discussion. We present power spectral ... -
Electronic Structure of Metallophlorins: Lessons from Iridium and Gold Phlorin Derivatives
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-14)Phlorins have long remained underexplored relative to their fully conjugated counterparts, such as porphyrins, hydroporphyrins, and corroles. Herein, we have attempted to bridge that knowledge gap with a scalar-relativistic density functional theory (DFT) study of unsubstituted iridium and gold phlorin derivatives and a multitechnique experimental study of iridium-bispyridine and gold complexes of ...