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Nonlinear model predictive control under uncertainty: Enhancing efficiency, stability and robustness
(Doctoral theses at NTNU;2024:197, Doctoral thesis, 2024)Model predictive control (MPC) is an advanced control technique that is used in process industries and has recently gained attention for application in various fields. It is an optimization-based control that uses predictions ... -
Nonlinear model-based control of two-phase flow in risers by feedback linearization
(Journal article, 2013)Active control of the production choke valve is the recommended solution to prevent severe slugging flow conditions at offshore oilfields. The slugging flow constitutes an unstable and highly nonlinear system; the gain of ... -
Nonlinear modeling and control for an evaporator unit
(Journal article; Peer reviewed, 2018)This article presents a nonlinear modeling approach describing the enthalpy dynamics between the inlet of the economizer and the outlet of the evaporator in a once-through boiler. The model is used to design an LQG controller ... -
Nonsmooth Modelling of Multiphase Multicomponent Heat Exchangers with Phase Changes
(Master thesis, 2018)Developing proper and consistent dynamic models of processes with phase changes can be challenging. Appearance and disappearance of phases result in changes in the system equations and is not known a priori. Dynamic models ... -
A Norwegian steam explosion biorefinery
(Chapter, 2023) -
Novel Alginate Complex-derived Fe Catalysts for Sustainable Lower Olefin Production: Fischer-Tropsch Synthesis Based on Renewable Feedstocks
(Doctoral theses at NTNU;2022:310, Doctoral thesis, 2022) -
Novel Approaches in Robust Multistage Nonlinear Model Predictive Control
(Doctoral theses at NTNU;2021:51, Doctoral thesis, 2021)A powerful tool that has been widely used for control and optimization in the chemical process industry is model predictive control (MPC), thanks to its capacity for handling multivariable constrained control problems. ... -
Novel Approaches to Online Process Optimization Under Uncertainty: Addressing the limitations of current industrial practice
(Doctoral theses at NTNU;2019:301, Doctoral thesis, 2019)In the face of growing competition and increased necessity to focus on sustainability and energy efficiency, there is a clear need to optimize the day-to-day operation of many industrial processes. This involves online ... -
A Novel CO2 Capture and Utilization Strategy by Enzyme Catalysis: Preliminary Assessment of Process Layout
(Peer reviewed; Journal article, 2022)Catalytic conversion of CO2 into fuels and valuable chemicals has gained large attention in the scientific and industrial research aimed at developing novel Carbon Capture and Utilization (CCU) processes. Among current ... -
Novel CO2 separation membranes with functionalized nanofillers
(Master thesis, 2018)In this work, a series of GO-based and nanocellulose-based nanoparticles were successfully functionalized through the EDC-catalyzed amide forming reaction, which confirmed by the new generated amide bond on FTIR spectrums ... -
Novel computational analysis of large transcriptome datasets identifies sets of genes distinguishing chronic obstructive pulmonary disease from healthy lung samples
(Peer reviewed; Journal article, 2021)Chronic obstructive pulmonary disease (COPD) kills over three million people worldwide every year. Despite its high global impact, the knowledge about the underlying molecular mechanisms is still limited. In this study, ... -
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, ...