Blar i Faculty of Mathematics and Natural Sciences på tittel
Viser treff 3204-3223 av 9855
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Formic acid aided catalytic lignin conversion in ethanol and water media
(Doctoral thesis, 2016-12-21)The viability of future lignocellulosic bio-refineries is highly dependent on the efficient conversion of the lignin component. A promising and relatively new lignin conversion methodology is the Lignin-to-Liquid (LtL) ... -
Formic acid assisted liquefaction of lignin in water and ethanol, investigated for a 0.025 and a 5 L batch reactor: Comparison of yields and compositions of the products
(Peer reviewed; Journal article, 2019)Formic acid assisted conversion of lignin to liquids (LtL-process), where lignin is hydrodeoxygenated in a one-step conversion, produces bio-oils with a molecular weight range of 300–600 Da that comprise a complex mixture ... -
Formulas as programs
(Master thesis, 2003)Alma-0 is a programming language supporting declarative programming, which combines the advantages of imperative and logic programming paradigms. This work explores declarative programming by extending the interpretation ... -
Forovermodellering og inversjon av 3D og 4D CSEM-data basert på integralligningsmetoder
(Master thesis, 2010-06-01)Elektromagnetiske undersøkelser blir benyttet i letesammenheng for å skille mellom vann- og hydrokarbonfylte prospekt, og dermed øke sannsynligheten for å finne hydrokarboner. I forovermodellering, benyttes ulike ... -
Forståelse av matematiske tekstoppgaver. Hva bør man som lærer ha tenkt gjennom når man ønsker at elevene skal jobbe med tekstoppgaver i matematikk?
(Master thesis, 2018-06-21)Denne studien tar for seg matematiske tekstoppgavers oppbygning og ser på ulike typer utfordringer elever kommer over i møte med tekstoppgaver. Utfordringene handler i stor grad om det å oversette teksten i tekstoppgaver ... -
Forståelse av naturlig seleksjon - En kvantitativ undersøkelse av elevers og studenters misoppfatninger knyttet til naturlig seleksjon ved bruk av Diagnostisk Test av Naturlig Seleksjon
(Master thesis, 2023-06-02)Forståelse av naturlig seleksjon og evolusjon kan gi elever og studenter en dypere innsikt i sammenhenger i naturen og hvor viktig det er å bevare det biologiske mangfoldet. Imidlertid er det mange misoppfatninger knyttet ... -
Forsøk på syntese av imidazol-2-yliden baserte sølvkomplekser med hydrofile 4-(5)-sidekjeder
(Master thesis, 2010-05-31)Sølvets bakteriedrepende egenskaper har vært kjent siden antikken og sølv har vært utnyttet som sårbehandler helt inn i moderne tider. Utviklingen av sølvpreparater har vært lang og inkluderer sølvobjekter og salter til ... -
Forward and midrapidity like-particle ratios from p+p collisions at root s=200 GeV
(Peer reviewed; Journal article, 2005-02)We present a measurement of π−/π+π−/π+, K−/K+K−/K+ and p¯/p from p+pp+p collisions at s=200 GeV over the rapidity range 0<y<3.40<y<3.4. For pT<2.0 GeV/cpT<2.0 GeV/c we see no significant transverse momentum dependence of ... -
Forward-backward multiplicity correlations in pp collisions at √s = 0.9, 2.76 and 7 TeV
(Peer reviewed; Journal article, 2015-05-20)The strength of forward-backward (FB) multiplicity correlations is measured by the ALICE detector in proton-proton (pp) collisions at s√ = 0.9, 2.76 and 7 TeV. The measurement is performed in the central pseudorapidity ... -
Forward-central two-particle correlations in p-Pb collisions at \(\sqrt{s_{\rm NN}}\) = 5.02 TeV
(Peer reviewed; Journal article, 2016-02)Two-particle angular correlations between trigger particles in the forward pseudorapidity range \(2.5 < |\eta| < 4.0\) and associated particles in the central range \(|\eta| < 1.0\) are measured with the ALICE detector ... -
Fossil pollen and spores as a tool for reconstructing ancient solar-ultraviolet irradiance received by plants: an assessment of prospects and challenges using proxy-system modelling
(Peer reviewed; Journal article, 2019)Ultraviolet-B radiation (UV-B, 280–315 nm) constitutes less than 1% of the total solar radiation that reaches the Earth's surface but has a disproportional impact on biological and ecological processes from the individual ... -
Four billion years of ophiolites reveal secular trends in oceanic crust formation
(Peer reviewed; Journal article, 2014-07)We combine a geological, geochemical and tectonic dataset from 118 ophiolite complexes of the major global Phanerozoic orogenic belts with similar datasets of ophiolites from 111 Precambrian greenstone belts to construct ... -
Fourier analysis on abelian groups; theory and applications
(Master thesis, 2017)Fourier analysis expresses a function as a weighted sum of complex exponentials. The Fourier machinery can be applied when a function is defined on a locally compact abelian group (LCA). The groups R, T = R / Z, Z and Z_n ... -
Fourier Transform Infrared Spectroscopy Combined with Partial Least Squared Regression and Standard Addition-Net Analyte Signal Method for Quantification of Chitin in Insect-based Fish Feeds
(Master thesis, 2018-10-25)Fourier transform infrared spectroscopy (FTIR) spectroscopy is a rapid and non-destructive technique applied with little or no sample preparation step. This work presents the use of FTIR spectroscopy combined with partial ... -
FPT Algorithms for Diverse Collections of Hitting Sets
(Peer reviewed; Journal article, 2019-11-27)In this work, we study the d-Hitting Set and Feedback Vertex Set problems through the paradigm of finding diverse collections of r solutions of size at most k each, which has recently been introduced to the field of ... -
FPT Approximation for Fair Minimum-Load Clustering
(Journal article; Peer reviewed, 2022)In this paper, we consider the Minimum-Load k-Clustering/Facility Location (MLkC) problem where we are given a set P of n points in a metric space that we have to cluster and an integer k > 0 that denotes the number of ... -
Fractal hypothesis of the pelagic microbial ecosystem-can simple ecological principles lead to self-similar complexity in the pelagic microbial food web?
(Peer reviewed; Journal article, 2015-12-01)Trophic interactions are highly complex and modern sequencing techniques reveal enormous biodiversity across multiple scales in marine microbial communities. Within the chemically and physically relatively homogeneous ... -
Fractal structures in freezing brine
(Peer reviewed; Journal article, 2017-09)The process of initial ice formation in brine is a highly complex problem. In this paper, we propose a mathematical model that captures the dynamics of nucleation and development of ice inclusions in brine. The primary ... -
Fracture formation due to differential compaction under glacial load: a poro-elastoplastic simulation of the Hugin Fracture
(Journal article; Peer reviewed, 2021)The Hugin Fracture, discovered in 2011, is an approximately 3.5 km long seafloor fracture in the North Sea. This fracture was unexpected and, due to the geology in the North Sea no obvious explanation could be found. In ... -
Fracture patterns in a fold – a case study from Bude, UK
(Master thesis, 2021-03-05)Fracture patterns in a well-exposed folded Carboniferous sandstone and shale sequence at Bude, SW England, have been analysed, and the use of such surface analogues for modelling fracture systems is discussed. Each fracture ...