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norskArtikler, rapporter og annet (automasjon og prosessteknologi)
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Statistical prediction and sensitivity analysis of kinetic rate constants for efficient thermal valorization of plastic waste into combustible oil and gases
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-06)Sensitivity analyses of rate constants for chemical kinetics of the pyrolysis reaction are essential for the efficient valorization of plastic waste into combustible liquids and gases. Finding the role of individual rate constants can provide important information on the process conditions, quality, and quantity of the pyrolysis products. The reaction temperature and time can also be reduced through ... -
Interactive teaching in an international preparatory language program; promoting some of the 21st century skills
(Conference object; Konferansebidrag, 2022-10)As the globalization has intensified, the future of engineering education may require its students to enhance the 21st century skills such as critical thinking, collaboration and communication skills (Riemer 2007, Gradin and Hirleman, 2009). In harmony with this, preparatory language programs for engineering studies must adopt educational methods that help students to cultivate such key skills. ... -
Supporting students to prepare for higher education studies: Enhancing English writing skills with formative peer assessment
(Conference object; Konferansebidrag, 2022-10)Studies report that writing skills of many beginner students in Norwegian higher education institutions are not adequately developed, showing a lack of critical thinking and referencing technique and a poor requisite language ability (Lødding and Aamodt 2015, Wollcheid et al. 2020). Literature also shows that a traditional lecture setting does not help students to enhance their learning autonomy ... -
Hvordan vi motiverer våre internasjonale ingeniørstudenter
(Conference object; Konferansebidrag, 2023) -
Developing formative peer assessment in writing classes: focus on students’ perceptions
(Conference object; Konferansebidrag, 2023-03)The literature of higher education has shown that formative peer assessment (FPA) promotes students’ learning across disciplines (Topping, 1998, Lynch et al. 2012, Li et al. 2019, among others). Despite the solid reported benefits, studies on an effective implementation of FPA are still limited in the literature (Nicol, Thomson, and Breslin 2014, Wanner and Palmer, 2018). A debilitating factor ... -
Havforskningsinstituttets rådgivning for menneskeskapt støy i havet - Kunnskapsgrunnlag, vurderinger og råd for 2023
(Research report; Forskningsrapport, 2023)Havforskningsinstituttet gir råd for alle operasjoner til havs som involverer bruk av lydkilder, samt elektromagnetiske kilder som kan påvirke marine økosystemer. Dette inkluderer vitenskapelige undersøkelser, utbygging og sprenging i sjø, seismiske og elektromagnetiske undersøkelser i forbindelse med petroleumsvirksomhet og utbygging og drift av vindkraftanlegg til havs. Denne rapporten er en ... -
Understanding Physical Properties of Fresh Water and Marine Ice using Multiphysics Modelling and Infrared Thermography
(Conference object; Konferansebidrag, 2023)Ice has unique physical properties, which tend to vary depending on how, where, and when it forms. In the presented work, we looked deeper into various physical properties of ice. In one of the studies, we focused on studying the ice adhesion on two types of polymers; polyurethane (PU) and polyvinyl-chloride (PVC). It revealed interesting behaviors with a viable potential for roads/highways coated ... -
Sensitivity Analysis of Thermal Degradation of Plastic Waste Using Statistically Assumed Exponential Factors and Activation Energies
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-04)The rise in the production of plastic waste has prompted the exploration of various recovery options instead of landfilling, burning, and other unethical ways of decomposing. The experimentally generated rate constants for the thermal processing of plastic waste do not yield enough liquid fuels and gases for commercial-scale usage. It is imperative to predict kinetic rate constants statistically ... -
Multiphysics Simulation of Particle-Surface Interaction and its Effect on Powder Patterns and Process Optimization
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)In industrial processes, powder coating is widely utilized to attain functional or aesthetic surface properties on manufactured parts. A Eulerian-Lagrangian Multiphysics solver has been developed within the OpenFOAM framework in order to simulate and optimize such processes with regards to coating efficiency and homogeneity. In the scope of this study, the powder particle-substrate and particle-particle ... -
Data Processing Scheme for Laser Spot Thermography Applied for Nondestructive Testing of Composite Laminates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-08)This paper proposes a data processing scheme for laser spot thermography (LST) applied for nondestructive testing (NDT) of composite laminates. The LST involves recording multiple thermographic sequences, resulting in large amounts of data that have to be processed cumulatively to evaluate the diagnostic information. This paper demonstrates a new data processing scheme based on parameterization and ... -
Numerical sensitivity analysis of temperature-dependent reaction rate constants for optimized thermal conversion of high-density plastic waste into combustible fuels
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-22)The use of experimental rate constants for producing a high yield of liquid fuels from the pyrolysis of plastic waste is not widely accepted owing to a lack of compatibility between the different kinetic rate constants responsible for successful conversion reactions. In R software, the Arrhenius law can forecast the ideal combination of reaction rate constants and frequency factors and then perform ... -
UA and pinch point temperature difference modeling — Finding the best heat exchanger schemes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-28)Process models using simplified heat exchanger (HE) models are often analyzed using methods based on derivatives or optimization procedures, where even small numerical errors can cause algorithms to fail. This article explores the use of numerical approximations for calculating pinch temperature and UA-value, including novel high-order polynomial methods using equidistant and Chebyshev grids. The ... -
New dose-response model and SARS-CoV-2 quanta emission rates for calculating the long-range airborne infection risk
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-14)Predictive models for airborne infection risk have been extensively used during the pandemic, but there is yet still no consensus on a common approach, which may create misinterpretation of results among public health experts and engineers designing building ventilation. In this study we applied the latest data on viral load, aerosol droplet sizes and removal mechanisms to improve the Wells Riley ... -
Response Surface Methodology Analysis of Pyrolysis Reaction Rate Constants for Predicting Efficient Conversion of Bulk Plastic Waste into Oil and Gaseous Fuels
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-17)The growing production of plastic waste and improper dumping after use has become a worldwide challenge. This waste is a substantial source of petroleum and can be effectively converted into pyrolytic oil and other useful products. A statistical prediction of the rate constants is essential for optimizing pyrolysis process parameters, such as activation energy (Ea), frequency factor (Ao), temperature ... -
Applying the response surface methodology to predict the energy retrofit performance of the TABULA residential building stock
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-28)Recent advances in computing software have enabled the development of calibrated building energy simulations tools that allow retrofit-related analysis including optimization and energy-efficient building design. However, to create a national energy and climate plan, using these tools may imply a great deal of effort (time, cost, and human resources) to carry out simulations for the full set of ... -
Multiphysics based Analysis of Materials for Roads in Cold Regions to Prevent Ice Adhesion and Low-Temperature Crack Developments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-12)Roads constitute a significant hazard if the effects of wintertime are not handled well. After a heavy snowfall, the most dangerous factor is a slippery surface due to ice adhesion with the asphalt pavement. The ice on roads increases the risk of road accidents and, upon melting, contributes to the formation of Low-Temperature Cracks (LTCs) and potholes. This research explores the physical ... -
Experimental study on the exposure level of surgical staff to SARS-CoV-2 in operating rooms with mixing ventilation under negative pressure
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-21)The purpose of this study was to reveal the exposure level of surgical staff to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from the patient's nose and wound during operations on COVID-19 patients. The tracer gas N<sub>2</sub>O is used to simulate SARS-CoV-2 from the patient's nose and wound. In this study, concentration levels of tracer gas were measured in the breathing zones of ... -
Zonal modeling of air distribution impact on the long-range airborne transmission risk of SARS-CoV-2
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-28)A widely used analytical model to quantitatively assess airborne infection risk is the Wells-Riley model which is limited to complete air mixing in a single zone. However, this assumption tends not to be feasible (or reality) for many situations. This study aimed to extend the Wells-Riley model so that the infection risk can be calculated in spaces where complete mixing is not present. Some more ... -
Modeling the impact of indoor relative humidity on the infection risk of five respiratory airborne viruses
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-07)With a modified version of the Wells-Riley model, we simulated the size distribution and dynamics of five airborne viruses (measles, influenza, SARS-CoV-2, human rhinovirus, and adenovirus) emitted from a speaking person in a typical residential setting over a relative humidity (RH) range of 20–80% and air temperature of 20–25 °C. Besides the size transformation of virus-containing droplets due to ... -
Comparison of Deep Learning Models for the Classification of Noctilucent Cloud Images
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-10)Optically thin layers of tiny ice particles near the summer mesopause, known as noctilucent clouds, are of significant interest within the aeronomy and climate science communities. Groundbased optical cameras mounted at various locations in the arctic regions collect the dataset during favorable summer times. In this paper, first, we compare the performances of various deep learningbased image ...
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