Browsing Øvrige samlinger by Title
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Optimization of Francis Turbines for Variable Speed Operation Using Surrogate Modeling Approach
(Peer reviewed; Journal article, 2020)Previous studies suggested variable speed operation (VSO) of Francis turbines as a measure to improve the efficiency at off-design operating conditions. This is, however, strongly dependent on the hydraulic design and, for ... -
Optimization of helium extraction processes integrated with nitrogen removal units: A comparative study
(Journal article; Peer reviewed, 2019)Helium is regarded as a vital gas to various industries such as medicine, aircraft manufacturing, electronics and fiber optics fabrication. Currently, natural gas reserves are considered the only viable resource for this ... -
Optimization of leak detectors’ positioning in a hydrogen refueling station
(Peer reviewed; Journal article, 2023) -
Optimization of Liquid Air Energy Storage (LAES) using a Genetic Algorithm (GA)
(Peer reviewed; Journal article, 2020)Renewable energy sources have a growing share in the energy market due to the threat from climate change, which is caused by emissions from fossil fuels. A future energy scenario that is likely to be realized is distributed ... -
Optimization of maintenances following proof tests for the final element of a safety-instrumented system
(Journal article; Peer reviewed, 2020)Safety-instrumented systems (SISs) have been widely installed to prevent accidental events and mitigate their consequences. Mechanical final elements of SISs often become vulnerable with time due to degradations, but the ... -
Optimization of offshore wind turbine support structures using an analytical gradient-based method
(Journal article; Peer reviewed, 2015)Design optimization of offshore wind turbine support structures is an expensive task; due to the highly-constrained, non-convex and non-linear nature of the design problem. This paper presents an analytical gradient-based ... -
Optimization of offshore wind turbine support structures using analytical gradient-based method
(Report;BAT/MB/OW-R01/2015, Research report, 2015)Design optimization of the offshore wind turbine support structure is an expensive task; due to the highly-constrained, non-convex and non-linear nature of the design problem. This report presents an analytical gradient-based ... -
Optimization of operational cost for a grid-supporting PV system with battery storage
(Journal article, 2016)Coupling an energy storage to a photovoltaic (PV) system not only increases the self-consumption but also solves the over-voltage issues if the cycling of the storage is properly controlled. Whatever the application the ... -
Optimization of Organic Rankine Cycles for Waste Heat Recovery From Aluminum Production Plants
(Journal article; Peer reviewed, 2019)This paper presents the optimization of organic Rankine cycles (ORCs) for recovering waste heat from a hypothetical aluminum production plant to be installed in Norway. The case study is particularly interesting because ... -
Optimization of periodic inspection time of sis subject to a regular proof testing
(Chapter, 2018)Periodic testing is a method to ascertain the availability of Safety Instrumented Systems (SIS). These systems are generally passive and are activated only on demand. Testing is then required to diagnose their current state ... -
Optimization of Process Parameters for Powder Bed Fusion Additive Manufacturing by Combination of Machine Learning and Finite Element Method: A Conceptual Framework
(Journal article; Peer reviewed, 2018)In addition to prototyping, Powder Bed Fusion (PBF) AM processes have lately been more widely used to manufacture end-use parts. These changes lead to necessity of higher requirements to quality of a final product. ... -
Optimization of Processing Parameters and Microstructure Evolution of (TiB+La2O3)/Ti6Al4V Manufactured by Laser Melting Deposition
(Peer reviewed; Journal article, 2023)Due to the intrinsically ultrahigh cooling rate and thermal gradient during laser melting deposition (LMD), columnar-to-equiaxed transition (CET) of grains has been a significant challenge in titanium-based alloys. In this ... -
Optimization of pulsed-wave Doppler ultrasound for estimation of influx/efflux in oil and gas boreholes while drilling using conventional LWD transducers
(Peer reviewed; Journal article, 2022)The extraction of oil and gas typically involves drilling boreholes through various subsurface strata. Abrupt variations in the formation properties can severely compromise the borehole stability if the drilling process ... -
Optimization of Reactor Temperature for Continuous Anaerobic Digestion of Cow Manure: Bangladesh Perspective
(Peer reviewed; Journal article, 2020)Converting organic waste into energy through anaerobic digestion is gaining popularity day by day. The reactor temperature is considered as one of the most vital factors for the digestion process. An experiment was conducted ... -
Optimization of recertification intervals for PSV based on major accident risk
(Journal article, 2016)Overpressure is a major hazard in the process industry with the potential to lead to a major accident. Pressure Safety Valves (PSVs) are often used as the last layer of protection against such a hazard and require regular ... -
Optimization of routing and scheduling of vessels to perform maintenance at offshore wind farms
(Journal article; Peer reviewed, 2015)This paper studies the problem of finding the optimal routes and schedules for a fleet of vessels that are to perform maintenance tasks at an offshore wind farm. To solve the problem two alternative models are presented: ... -
Optimization of Sample Size for Two-Point Diameter Verification in Coordinate Measurements
(LNEE;volume 484, Journal article; Peer reviewed, 2019)This paper investigates the possibility for reduction of sample size for inspection of two-point diameters with a coordinate measuring machine, by use of statistical methods. The statistical methods implement the parametric ... -
Optimization of SERS Sensing With Micro-Lensed Optical Fibers and Au Nano-Film
(Peer reviewed; Journal article, 2020)We present the fabrication and characterization of optical fiber reflection probes based on surface-enhanced Raman scattering (SERS) and micro-lensed multimode fibers. For the SERS substrate, a nano-sphere lithography ... -
Optimization of single mixed-refrigerant natural gas liquefaction processes described by nondifferentiable models
(Journal article; Peer reviewed, 2018) -
Optimization of the filler concentration on fused filament fabrication 3d printed polypropylene with titanium dioxide nanocomposites
(Peer reviewed; Journal article, 2021)Polypropylene (PP) is an engineered thermoplastic polymer widely used in various applications. This work aims to enhance the properties of PP with the introduction of titanium dioxide (TiO2) nanoparticles (NPs) as nanofillers. ...