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Novel Framework for Simulated Moving Bed Reactor Optimization Based on Deep Neural Network Models and Metaheuristic Optimizers: An Approach with Optimality Guarantee
(Peer reviewed; Journal article, 2023)Model-based optimization of simulated moving bed reactors (SMBRs) requires efficient solvers and significant computational power. Over the past years, surrogate models have been considered for such computationally demanding ... -
A Novel Hybrid Digestion-Gasification Process Integrated with Membranes for Efficient Conversion of Biomass to Bio-alcohols
(Peer reviewed; Journal article, 2020)There is an urgent need to develop technologies which enable the conversion of biomass into liquid biofuels to fill the gap between limited fossil fuel supplies and increasing worldwide demand. In order to achieve the EU ... -
Novel hybrid membranes for post-combustion CO2 capture
(Doctoral theses at NTNU;2017:274, Doctoral thesis, 2017)Climate change is undeniable. Greenhouse gases emissions such as CO2, CH4, and others, have caused that the global temperature starts to increase, and thus originating several changes in the world atmosphere. On the other ... -
Novel Nuclear Magnetic Resonance Techniques To Assess the Wax Precipitation Evolution in Crude Oil Systems
(Peer reviewed; Journal article, 2022)Wax crystallization in cold environments constitutes one of the main causes for flow assurance problems during oil production. Several techniques, such as differential scanning calorimetry (DSC) or gas chromatography/mass ... -
Novel Tubular Carbon Membranes Prepared from Natural Rattans
(Journal article; Peer reviewed, 2019)The novel tubular carbon membranes produced from natural materials are, for the first time, reported. The novelty of this idea is to use natural rattans as precursors for making carbon membranes to address the challenges ... -
Nucleation and Growth of Brushite in the Presence of Alginate
(Journal article, 2015)Biomineral formation in vivo is a complex process regulated by functional molecules. Highlighting the mechanisms underlying biomineralization is necessary for a better understanding of in vivo processes and for enhanced ... -
Nucleation kinetics and polymorphism of calcium carbonate particles in natural gas production
(Master thesis, 2012)Precipitation of calcium carbonate in pipes and process equipment is a widespread problem in natural gas production as we know it today. Studies of calcium carbonate systems are crucial to prevent this problem. When the ... -
Numerical Implementation and Evaluation of a Set of Population Balance Breakage Closures
(Master thesis, 2016)The population balance equation (PBE) can be used to model multiphase processes, where one or more dispersed phases are distributed in a continuous medium. In such systems, the interfacial area is an important quantity, ... -
Numerical Investigation of the Pressure Drop Characteristics of Isothermal Ice Slurry Flow under Variable Ice Particle Diameter
(Peer reviewed; Journal article, 2020)Ice slurry is an advanced secondary refrigerant that has been attracting considerable attention for the past decade due to the growing concerns regarding energy shortage and environmental protection. To stimulate the ... -
Numerical Study of Mass Transfer Limitations in a Bioreactor Operated in the Heterogeneous Flow Regime
(Master thesis, 2017)With the increased focus on detaining a more environmental friendly industry, biological processes have been given more attention over the last years. Such a biological process is single cell protein (SCP) production, ... -
The O-factor: using the H-factor concept to predict the outcome of organosolv pretreatment
(Peer reviewed; Journal article, 2021)The H-factor, a parameter used extensively to analyze and predict the outcome of kraft pulping, is applied to organosolv pretreatment. The total solid yield after organosolv pretreatment fits well with the H-factor. The ... -
Offshore Gas-to-Liquid Production
(Master thesis, 2013)Gas-to-liquid (GTL) production technology is a process by which associated natural gas is chemically converted into liquid products, such as liquefied natural gas (LNG), methanol and liquid transportation fuels. The process ... -
Oil-in-Water Emulsions Stabilized by Cellulose Nanofibrils—The Effects of Ionic Strength and pH
(Journal article; Peer reviewed, 2019)Pickering o/w emulsions prepared with 40 wt % rapeseed oil were stabilized with the use of low charged enzymatically treated cellulose nanofibrils (CNFs) and highly charged 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized ... -
On combining self-optimizing control and extremum-seeking control - Applied to an ammonia reactor case study
(Journal article; Peer reviewed, 2019) -
On intermetallic phases formed during interdiffusion between aluminium alloys and stainless steel
(Peer reviewed; Journal article, 2022)One of the major challenges in welding of aluminium (Al) alloys and steels is the growth of brittle intermetallic phases, which depends on the thermomechanical processing history and the alloying elements. This work focuses ... -
On the Durability of Protective Titania Coatings on High-Voltage Spinel Cathodes
(Peer reviewed; Journal article, 2022)TiO2-coating of LiNi0.5-xMn1.5+xO4 (LNMO) by atomic layer deposition (ALD) has been studied as a strategy to stabilize the cathode/electrolyte interface and mitigate transition metal (TM) ion dissolution. The TiO2 coatings ... -
On the effect of the approach velocity on the coalescence of fluid particles
(Journal article; Peer reviewed, 2019)The effect of the constant relative approach velocity of two Newtonian fluid particles on their coalescence is investigated via a film drainage model. The interfaces are deformable and allowed to have any degree of mobility. ... -
On the interfacial roughness scale in turbulent stratified two-phase flow: 3D lattice Boltzmann numerical simulations with forced turbulence and surfactant
(Journal article; Peer reviewed, 2015)Numerical 3D simulations of turbulent, stratified two-phase shear flow with a surfactant laden interface were used to test and develop a phenomenological interfacial roughness scale model where the energy required to deform ... -
On the nature of Pt-carbon interactions for enhanced hydrogen generation
(Peer reviewed; Journal article, 2020)Understanding the metal-support interactions in heterogeneous catalysis is critical yet complicated to tailor-design the catalysts with desirable properties. Exemplified with Pt-catalyzed ammonia borane (AB) hydrolysis, a ...