Blar i Department of Mathematics and Natural Sciences på tittel
Viser treff 178-197 av 312
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On computational linear semi-infinite programming
(Peer reviewed; Journal article, 2008-12) -
On high-order perturbative calculations at finite density
(Journal article; Peer reviewed, 2017-02)We discuss the prospects of performing high-order perturbative calculations in systems characterized by a vanishing temperature but finite density. In particular, we show that the determination of generic Feynman integrals ... -
On the algebraic classification of pseudo-Riemannian spaces
(Journal article; Peer reviewed, 2011-12)We consider arbitrary-dimensional pseudo-Riemannian spaces of signature (k, k + m). We introduce a boost-weight decomposition and define a number of algebraic properties (e.g. the Si- and N-properties) and present a ... -
On the circadian organization of nitrogen and sulphur metabolism in Neurospora crassa
(PhD Thesis UiS;157, Doctoral thesis, 2012-04)The purpose of this thesis was to study the circadian organization of the nitrogen and sulphur metabolism in the filamentous fungi Neurospora crassa. Neurospora is an important model organism used in genetics and circadian ... -
On-shell parameter fixing in the quark-meson model
(Journal article; Peer reviewed, 2017-02)The quark-meson model is often used as an effective low-energy model for QCD to study the chiral transition at finite temperature T and baryon chemical potential μB. The parameters in the quark-meson model can be found by ... -
Optimization of acid catalyzed transesterification of jatropha and rapeseed oil with 1-butanol
(Peer reviewed; Journal article, 2014-08)The acid catalyzed transesterification of rapeseed and jatropha oil with 1-butanol was studied by varying temperature, reaction time, butanol/triglyceride ratio and the amount of sulfuric acid. A full factorial design ... -
Optimization of chemical and mechanical disintegration process of drilling fluids.
(Masteroppgave/UIS-TN-IMN/2015;, Master thesis, 2015-06)Drilling fluids are essential to conduct any drilling process. The amount of oil-based mud used daily is significant. Additives present in an oil-based mud ensure both unique properties and require proper waste treatment. ... -
Optimization of Wastewater Treatment Plant, SAR Treatment Tananger
(Masteroppgave/UIS-TN-IMN/2016;, Master thesis, 2016-06)The focus of this thesis is optimization of the wastewater treatment plant, SART owned by SAR AS. Based on an evaluation of the present treatment condition, capacity and limitations, performance of the plant has been ... -
Organic flow assurance, pour point depressant development through experimental design
(Masteroppgave/UIS-TN-IMN/2012;, Master thesis, 2012-07-03)Flow assurance is of great importance in the oil and gas industry, where the main objective is to provide and secure the transport of the well stream fluid from the reservoir to the process facilities. The main challenges ... -
Organic flow assurance: Asphaltene dispersant/inhibitor formulation development through experimental design
(Masteroppgave/UIS-TN-IMN/2012;, Master thesis, 2012)The exploitation of hydrocarbon has forced the petroleum production to move closer to extreme climate areas and deep waters such as the Barents Sea. These challenges require effective and safe production, transport and ... -
Paramagnetism shielding in drilling fluid
(Masteroppgave/UIS-TN-IMN/2013;, Master thesis, 2013)In drilling operations, drilling fluid containing magnetic materials is used when drilling a well. The materials can significantly shield the Earth’s magnetic field as measured by magnetic sensors inside the drilling ... -
Part A: Synthesis of acetophenones with possible applications in anthocyanin synthesis. Part B: Synthesis and ring opening of selected strained gem-dihalocyclopropyl ethers
(Masteroppgave/UIS-TN-IMN/2011;, Master thesis, 2011)Part A: Synthesis of acetophenones with possible applications in anthocyanin synthesis. The preparations of 4 acetophenones were investigated: 4-Hydroxy-3,5-dimethoxyacetophenone, 3,4-dihydroxy-5-methoxyacetophenone, ... -
Passive Solar Driven Water Treatment of Contaminated Water Resources
(Masteroppgave/UIS-TN-IMN/2015;, Master thesis, 2016-07-15)Freshwater, being vital for mankind survival, has become a very serious concern for the public especially living in countries with limited water, energy and economic resources. Freshwater generation is an energy-intensive ... -
Performance of salsnes water to algae treatment (swat) technology in a continuous mode for high algae recovery
(Masteroppgave/UIS-TN-IMN/2014;, Master thesis, 2014-04-03)Many researchers consider efficient harvesting is the major bottleneck in cost efficient production of microalgae, contributing 20 – 30 % to total production cost. This thesis is the conclusion of a two years research ... -
Performance of sequencing batch reactors for nutrient removal using salsnes filter fine mesh sieves as a primary treatment
(Masteroppgave/UIS-TN-IMN/2013;, Master thesis, 2013)This study investigated the performance of sequencing batch reactors (SBR) for nitrification and denitrification. Bench scale Salsnes Filter (SF) was used as a primary treatment to provide wastewater with different organic ... -
Phenotype identification, cloning and expression of B55 subunit mutants of protein phosphatase 2A in Arabidopsis model plant
(Masteroppgave/UIS-TN-IMN/2012;, Master thesis, 2012)Plant photoreceptors sense light and regulate certain downstream genes to alter morphological features. In Arabidopsis, these are three classes of photoreceptors: far/red light absorbing phyochromes, UV/blue light absorbing ... -
Photochemical oxidative cyclisation of stilbenes and stilbenoids : the Mallory-reaction
(Journal article; Peer reviewed, 2011-06-14)After Mallory described in 1964 the use of iodine as catalyst for the photochemical cyclisation of stilbenes, this reaction has proven its effectiveness in the synthesis of phenanthrenes, other PAHs and phenacenes with a ... -
Photochemical synthesis of chrysenols
(Peer reviewed; Journal article, 2008-08)Chrysenols are formed together with other metabolites when chrysene is metabolized in living organisms. The principal metabolites are needed as pure compounds for reference materials and standards to study various aspects ... -
Pigment identification during deetiolation of barley seedlings
(Masteroppgave/UIS-TN-IMN/2012;, Master thesis, 2012)Angiosperm plants like barley (Hordeum vulgare) lack chlorophyll when grown in complete dark. Upon exposure to light, chlorophyll is formed during the process of deetiolation. Here , we show that in complete darkness barley ... -
Plasma drilling on solar system objects
(Masteroppgave/UIS-TN-IMN/2017;, Master thesis, 2017-06)The search for water, minerals and most importantly evidence of life on other objects of our solar system will require access to the subsurface for sampling and in situ investigations. Drilling is therefore needed for this ...