Blar i USN Open Archive på forfatter "Halstensen, Maths"
-
3-way PLS regression and dual energy gamma densitometry for prediction of total volume fractions and enhanced flow regime identification in multiphase flow
Halstensen, Maths; Amundsen, Lene; Arvoh, Benjamin Kaku (Journal article; Peer reviewed, 2014-12)Dual energy gamma densitometry and 3-way partial least squares regression were applied to quantify the total volume fractions and improve flow regime identification in multiphase flow. Multiphase flow experiments were ... -
Acoustic chemometric prediction of total solids in bioslurry: A full-scale feasibility study for on-line biogas process monitoring
Ihunegbo, Felicia Nkem; Madsen, Michael; Esbensen, Kim H.; Holm-Nielsen, Jens Bo; Halstensen, Maths (Journal article; Peer reviewed, 2012)Dry matter is an important process control parameter in the bioconversion application field. Acoustic chemometrics, as a Process Analytical Technology (PAT) modality for quantitative characterisation of dry matter in complex ... -
Acoustic chemometrics for material composition quantification in pneumatic conveying - The critical role of representative reference sampling
Wagner, Claas; Ihunegbo, Felicia Nkem; Halstensen, Maths; Esbensen, Kim H. (Journal article; Peer reviewed, 2012)Reliable monitoring of pneumatically conveyed particulate materials is critical for online detection and controlling material composition changes in the regimen of Process Analytical Technology (PAT), e.g. as the case ... -
Acoustic chemometrics for on-line monitoring and end-point determination of fluidised bed drying
Ihunegbo, Felicia Nkem; Ratnayake, Chandana; Halstensen, Maths (Journal article; Peer reviewed, 2013-07-02)An emerging process analytical technology (PAT) technique, acoustic chemometrics, was applied for monitoring of heated fluidised bed drying process. The feasibility of quantitative on-line monitoring of the drying progress ... -
Alumina scale composition and growth rate in distribution pipes
Haugland, Ingrid Bokn; Kjos, Ole Sigmund; Røyset, Arne Karstein; Vullum, Per Erik; Aarhaug, Thor Anders; Halstensen, Maths (Peer reviewed; Journal article, 2019)Scaling in distribution pipes for secondary alumina is a major issue in aluminium smelters. The scale is formed inside the distribution pipes, and gradually reduces the cross section that is available for alumina transport. ... -
Architecting a Low-Cost System for Acoustic Monitoring in Hydroelectric Power Stations
Lie, Geir Kenneth (Master thesis, 2022)Acoustic sensors are used to monitor components in hydropower plants. Research and development of new solutions are of interest for plant maintenance, but requires processing of data sampled with a high frequency. Performing ... -
Chemometric analysis of a new benchmark CO2 capture solvent
Jahanshahi, Saeed (Master thesis, 2022)Greenhouse gases have challenging consequences on climate change and CO2 is one of the most effective elements in this issue. the methods to mitigate these effects such as capturing the carbon dioxide are the aim of this ... -
CO2 capture by MEA solvent: Chemical Speciation models of CO2 derived species & total solvent alkalinity by multivariate data analysis of FTIR spectra from the CO2 Technology Centre Mongstad
Khatibzadeh, Ayandeh (Master thesis, 2021)This study is the next step of ongoing research at University of South-eastern Norway (USN) to enable multivariate analysis for industrial scale capture process. This study has been done in collaboration with Technology ... -
Demonstration of CO2 Capture Process Monitoring and Solvent Degradation Detection by Chemometrics at the Technology Centre Mongstad CO2 Capture Plant
Wagaarachchige, Jayangi Dinesha; Idris, Zulkifli; Khatibzadeh, Ayandeh; Drageset, Audun; Jens, Klaus-Joachim; Halstensen, Maths (Peer reviewed; Journal article, 2023)Solvent management is one of the important current challenges in post combustion carbon capture (PCC) technology development. Using large-scale 1960 h test campaign data (Technology Centre Mongstad, Norway, 2015 MEA Test), ... -
Dynamic system multivariate calibration based on multirate sampling data
Ergon, Rolf; Halstensen, Maths (Journal article; Peer reviewed, 2001) -
Dynamic system multivariate calibration with low-sampling-rate y data
Ergon, Rolf; Halstensen, Maths (Journal article; Peer reviewed, 2000)When the data in principal component regression (PCR) or partial least squares regression (PLSR) form time series, it may be possible to improve the prediction/estimation results by utilizing the correlation between ... -
Equilibrium Measurements of the NH3-CO2-H2O System: Speciation Based on Raman Spectroscopy and Multivariate Modeling
Halstensen, Maths; Jilvero, Henrik; Jinadasa, Wathsala; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2017)Liquid speciation is important for reliable process design and optimization of gas-liquid absorption process. Liquid-phase speciation methods are currently available, although they involve tedious and time-consuming ... -
Estimation of gas/liquid and oil/water interface levels in an oil/water/gas separator based on pressure measurements and regression modelling
Arvoh, Benjamin Kaku; Skeie, Nils-Olav; Halstensen, Maths (Journal article; Peer reviewed, 2013-02-08)Gravity separators are widely used for separation of gas/oil/water/sand from both offshore and onshore oil production facilities. Estimation of the gas/liquid and oil/water interface levels in gravity separators have been ... -
Low-Viscosity Nonaqueous Sulfolane-Amine-Methanol Solvent Blend for Reversible CO2 Capture
Wagaarachchige, Jayangi Dinesha; Idris, Zulkifli; Arstad, Bjørnar; Kummamuru, Nithin Bharadwaj; Sætre, Kai Arne; Halstensen, Maths; Jens, Klaus-Joachim (Peer reviewed; Journal article, 2022)In this work, the absorption–desorption performance of CO2 in six new solvent blends of amine (diisopropylamine (DPA), 2-amino-2-methyl-1-propanol (AMP), methyldiethanolamine (MDEA), diethanolamine (DEA), diisopropanolamine ... -
Monitoring a New Benchmark Solvent for CO2 Capture: Pushing Technical Boundaries
Alam, Alamgir (Master thesis, 2024)Global warming of the earth is increasing significantly due to the emission of greenhouse gases where CO2 is the main influential gas for this adverse effect. To mitigate this problem CO2 capture with aqueous amine solvent ... -
Monitoring of Erosion in a Pneumatic Conveying System by Non-intrusive Acoustic Sensors – A Feasibility Study
Haugland, Ingrid Bokn; Chladek, Jana; Halstensen, Maths (Journal article; Peer reviewed, 2019)This paper presents the results of a study where the feasibility of a non-invasive acoustic measurement method was tested for monitoring of erosion in a pneumatic conveying system during the dilute-phase conveying of sand. ... -
Monitoring of scale formation in a pneumatic conveying system operating in a metal production plant
Haugland, Ingrid Bokn; Chladek, Jana; Halstensen, Maths (Journal article; Peer reviewed, 2019)Monitoring of scale progression in a pneumatic conveying system operating in a metal production plant was conducted during a five-month long monitoring period. A combination of an acoustic monitoring method and a laser ... -
Monitoring of scaling in dilute phase pneumatic conveying systems using non-intrusive acoustic sensors – A feasibility study
Haugland, Ingrid Bokn; Chladek, Jana; Halstensen, Maths (Journal article; Peer reviewed, 2019)Scale formation in pneumatic conveying systems is a major industrial challenge. The underlying scale formation mechanisms can be intricate as they often involve a combination of several mutually enhancing binding forces ... -
Online acoustic chemometric monitoring of fish feed pellet velocity in a pneumatic conveying system
Halstensen, Maths; Ihunegbo, Felicia Nkem; Ratnayake, Chandana; Sveinsvold, Karl (Journal article; Peer reviewed, 2014-03-14)Fish farmers consider the cost of fish feed pellets as one of the most expensive factors in fish cultivation. Proper control of the handling and conveying systems is necessary to avoid damage and disintegration of the ... -
Online estimation of wax deposition thickness in single-phase sub-sea pipelines based on acoustic chemometrics: A feasibility study
Halstensen, Maths; Arvoh, Benjamin Kaku; Amundsen, Lene; Hoffmann, Rainer (Journal article; Peer reviewed, 2012-10-25)Wax deposition in sub-sea oil producing pipelines is a concern to the oil producing companies. The deposition of wax in pipelines can cause serious economic implications if not monitored and controlled. Several researchers ...