Browsing Fakultet for naturvitenskap (NV) by Title
Now showing items 75-94 of 12736
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A comprehensive study on improved power materials for high-temperature thermoelectric generators
(Journal article; Peer reviewed, 2019)Dense Ca3Co4O9-NaxCoO2-Bi2Ca2Co2O9 (CCO-NCO-BCCO) nanocomposites were produced from sol-gel derived Ca2.25Na0.3Bi0.35Tb0.1Co4O9 powder by four methods: Hot-pressing (HP), spark plasma sintering (SPS) and pressureless ... -
A computational study of a ionic liquid and its ability to dissolve cellulose
(Master thesis, 2022)Oppløsningsmekanismen til en cellulosebunt solvatisert i blandinger av vann, Na+ og OH ble analysert gjennom molekylær dynamikksimulering og sammenlignet med den første i sitt slag simulerte ionisk væske som løsningsmiddel. ... -
A computational study of recrystallisation and grain growth using a 3D Potts Monte Carlo model
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:34, Doctoral thesis, 2009)The ever increasing capability of computer systems and the advances in theoretical understanding of the underlying physics and chemistry of materials have, over the last couple of decades, provided the basis for mathematical ... -
A concept for electrowinning of aluminium using depolarized gas anodes
(Journal article; Peer reviewed, 2014)Aluminium is today commercially produced by the Hall-Héroult process using consumable carbon anodes. Consumable anodes have some concerns such as CO2 emission, continuous anodecathode distance adjustments and replacements ... -
A consistent reduction of the two-layer shallow-water equations to an accurate one-layer spreading model
(Journal article; Peer reviewed, 2019)The gravity-driven spreading of one fluid in contact with another fluid is of key importance to a range of topics. These phenomena are commonly described by the two-layer shallow-water equations (SWE). When one layer is ... -
A Control- and Estimation-Oriented Gravity Separator Model for Oil and Gas Applications Based upon First-Principles
(Journal article; Peer reviewed, 2018)We introduce a simple model for a gravity separator based on first principles. It can be used for controller design to control the levels of oil, water, and the gas pressure as well as observer design to estimate unmeasurable ... -
A correlative spatiotemporal microscale study of calcium phosphate formation and transformation within an alginate hydrogel matrix.
(Journal article; Peer reviewed, 2016)The modification of soft hydrogels with hard inorganic components is a method used to form composite materials with application in non-load-bearing bone tissue engineering. The inclusion of an inorganic component may provide ... -
A CRISPR/Cas13-based method for downregulation of ALB3 genes in Phaeodactylum tricornutum
(Master thesis, 2021)Diatoms, a group of unicellular photosynthetic microalgae, are of high ecological importance. They are responsible for about 20% of the world’s oxygen production. They have also been exploited in research due to their high ... -
A CRISPR/Cas9 system adapted for gene editing in marine algae
(Journal article; Peer reviewed, 2016)Here we report that the CRISPR/Cas9 technology can be used to efficiently generate stable targeted gene mutations in microalgae, using the marine diatom Phaeodactylum tricornutum as a model species. Our vector design opens ... -
A critical update of experimental techniques of bulk and interfacial components for fluid characterization with relevance to well fluid processing and transport
(Journal article; Peer reviewed, 2020)The present article reviews techniques to address central flow assurance and separation issues. It is our purpose to update the need for extended information in order to draw adequate conclusions about the reason for ... -
A Crude Awakening: Effects of Crude Oil on Lipid Metabolism in Calanoid Copepods Terminating Diapause
(Journal article; Peer reviewed, 2019)Calanus finmarchicus and Calanus glacialis are keystone zooplankton species in North Atlantic and Arctic marine ecosystems because they form a link in the trophic transfer of nutritious lipids from phytoplankton to predators ... -
A CUDA Back-End for the Equelle Compiler.
(Master thesis, 2014)As parallel and heterogeneous computing becomes more and more a necessity for implementing high performance simulators, it becomes increasingly harder for scientists and engineers without experience in high performance ... -
A Density Functional Theory Study of Hydrogen Transfer and Rotational Barriers in Vitamin E-like Molecules
(Master thesis, 2011)A study of the antioxidant property of two vitamin E simplifications with density functional theory has been done. In one of the simplifications the phytyl tail and the methyl group on the heterocyclic ring in vitamin E ... -
A Diet Rich in Carbohydrates Induces Changes in Serum microRNA Levels Associated with Type 2 Diabetes Development.
(Master thesis, 2012)It is known that the level of serum microRNAs, small RNA molecules involved in regulation of gene expression, is altered in diabetic patients compared to healthy individuals and that microRNAs may be involved in the ... -
A Distributed Algorithm for Scenario-based Model Predictive Control using Primal Decomposition *
(Journal article; Peer reviewed, 2018)In this paper, we consider the decomposition of scenario-based model predictive control problem. Scenario MPC explicitly considers the concept of recourse by representing the evolution of uncertainty by a discrete scenario ... -
A Distributed Optimization Strategy for Large Scale Oil and Gas Production Systems
(Journal article; Peer reviewed, 2018)n this paper, we consider the problem of real-time optimization of an oil and gas production network. The production network is often made of several wells from different reservoir sections producing to a common processing ... -
A DPD study of asphaltene aggregation: The role of inhibitor and asphaltene structure in diffusion-limited aggregation
(Journal article; Peer reviewed, 2017)The kinetic effects of DBSA (dodecyl benzene sulfonic acid) and a linear amphihile on asphaltene aggregation was investigated, using dissipative particle dynamics molecular simulations. The simulation results indicated ... -
A Dynamic Extremum Seeking Scheme Applied to Gas Lift Optimization
(Journal article; Peer reviewed, 2019)This paper presents the application of a data-driven optimization scheme using transient measurements to a gas-lift optimization problem. Optimal operation of a gas-lifted field involves controlling the marginal gas-oil ... -
A dynamic state modelling approach to partial migration in brown trout
(Master thesis, 2022)Partiell migrasjon, fenomenet der ein populasjon har både individ som migrerer og individ som let vere, er observert i store delar av dyreriket. Mekanismane bak kan vere komplekse, og kan inkludere både genetikk og miljø ... -
A Fast Simulation Method for Ultrasonic Wave Propagation in Coupled Non-parallel Plates
(Master thesis, 2021)Enkelte systemer i ultralydtesting kan tilnærmes som to ikke-parallelle plater koblet med et fluid, der utstrålende Lamb-bølger brer seg ut i hver plate. Denne oppgaven utvikler en rask og nøyaktig simuleringsmetode for ...