Browsing USN Open Archive by Title
Now showing items 5716-5735 of 9742
-
Mobiltelefoner og helsefare : en cytogenetisk in vitro studie av radiofrekvente felters påvirkning på humant arvemateriale
(Master thesis, 2003-04-07)Hypotesen for denne undersøkelsen var at eksponering for høyfrekvente elektromagnetiske felter innenfor de fastsatte, internasjonale grenseverdiene ikke gir celleskader som direkte eller indirekte, kan føre til kreft. ... -
Modal analysis of piezoelectrically actuated plates with built-in stress by computationally augmented interferometric experiments
(Peer reviewed; Journal article, 2022)The conventional laser doppler vibrometers for modal analysis of micro-structures are expensive and sometimes inaccessible. In this work, a compact, fiber-based interferometric setup is used to carry out the modal analysis ... -
Mode of birth and long-term sexual health: a follow-up study of mothers in the Danish National Birth Cohort
(Peer reviewed; Journal article, 2019)Objectives To investigate the relation between mode of birth and women’s long-term sexual health. Design Maternal follow-up of the Danish National Birth Cohort (1996–2002) in 2013–2014 including questions on sexual ... -
Model based control for run-of-river system. Part 1: Model implementation and tuning
(Journal article; Peer reviewed, 2015)Optimal operation and control of a run-of-river hydro power plant depends on good knowledge of the elements of the plant in the form of models. River reaches are often considered shallow channels with free surfaces. A ... -
Model based control for run-of-river system. Part 2: Comparison of control structures
(Journal article; Peer reviewed, 2015)Optimal operation and control of a run-of-river hydro power plant depend on good knowledge of the elements of the plant in the form of models. Both the control architecture of the system, i.e. the choice of inputs and ... -
Model based control of run-of-river power plant Grønvollfoss
(Master thesis, 2015-10-09)Water level in the pondage is an important parameter for a run-of-river hydraulic power plant. Keeping a reasonably high waterfall will help to reduce the total cost of power generation. The aim of the work for this thesis ... -
Model Based Early Kick/Loss Detection and Attenuation with Topside Sensing in Managed Pressure Drilling
(Peer reviewed; Journal article, 2020)Early kick/loss detection is a crucial part of safe well control, and it plays a major role in the reduction of risk and non-productive time in drilling. In conventional drilling, topside sensing is used for early kick/loss ... -
Model based estimation of fluid flow through a venturi channel: Kalman filters and observers
(Master thesis, 2018)In oil drilling operation, the estimation of returning flow is vital for safe operation. The return flow gives an early warning of kick-loss phenomenon. Detecting kick-loss is important to prevent uncontrolled well-blowout. ... -
Model based flow measurement using venturi umes for return flow during drilling
(Journal article; Peer reviewed, 2017)In an oil well drilling operation, a proper knowledge of the return fluid flowrate is necessary both for the stabilization of the bottom hole pressure of the well and also as a primary indication of a kick or loss. In ... -
Model Fittng and State Estimation for Thermal Model of Synchronous Generator
(Master thesis, 2019)The power factor of a synchronous generator, in a European hydropower generation, is constrained to [0.85, 0.95], and for Norway, it is generally below 0.86. A higher power factor means more exploited power (active power), ... -
A Model for an Effective Learning Process in Higher Education: An Example from Three User Cases
(Peer reviewed; Journal article, 2022)Knowledge is the most important asset in education. Knowledge Management has been the focus for many years in higher education. Recently, universities have embraced innovative processes that could foster a better learning ... -
Model Free Optimal and Predictive Control of the K-Spice Process Simulator
(Master thesis, 2016)Impact of the slugging can significantly decrease oil production and have damage consequences for equipment. Nowadays, Model free optimal and predictive control is actual topic of discussion and could be not-exhaustive ... -
Model predictive control (MPC) with integral action; Reducing the control horizon and model free MPC
(Master thesis, 2015-09-25)Model Predictive Control (MPC) is the most widely used strategy in process industries due to remarkable features. It has the capability to control the non-minimum phase, unstable processes and handle the constraints in a ... -
Model Predictive Control with Integral Action: A simple MPC algorithm
(Journal article; Peer reviewed, 2013)A simple Model Predictive Control (MPC) algorithm of velocity (incremental) form is presented. The proposed MPC controller is insensitive to slowly varying system and measurement trends and therefore has integral action. ... -
Model uncertainty of interfacial area and mass transfer coefficients in absorption column packings
(Journal article; Peer reviewed, 2017)Uncertainty in model input parameters propagates through the model to make model output imprecision. Here, mathematical models used to calculate interfacial area and mass transfer coefficient for both random and structured ... -
Model-free optimal anti-slug control of a well-pipeline-riser in the K-Spice/LedaFlow simulator
(Journal article; Peer reviewed, 2015)Simplified models are developed for a 3-phase well-pipeline-riser and tested together with a high fidelity dynamic model built in K-Spice and LedaFlow. These models are developed from a subspace algorithm, i.e. Deterministic ... -
Model-Free PI/PID Controller Tuning of Higher Order Nonlinear Dynamic Systems
(Peer reviewed; Journal article, 2019)This paper concerns model-free PI/PID controller tuning of possible (nonlinear) higher order systems. The method can be considered as a three-step procedure. The first step is to persistently excite the system in open loop ... -
Model-Free Predictive Anti-Slug Control of a Well-Pipeline-Riser
(Journal article; Peer reviewed, 2016)Simplified linearized discrete time dynamic state space models are developed for a 3-phase well-pipeline-riser and tested together with a high fidelity dynamic model built in K-Spice and LedaFlow. In addition the Meglio ... -
Modeled storm surge changes in a warmer world: the Last Interglacial
(Peer reviewed; Journal article, 2023)The Last Interglacial (LIG; ca. 125 ka) is a period of interest for climate research as it is the most recent period of the Earth's history when the boreal climate was warmer than at present. Previous research, based on ... -
modelica.university: A Platform for Interactive Modelica Content
(Journal article; Peer reviewed, 2017)The World Wide Web was conceived of as a medium for the expression and exploration of scientific and engineering ideas. However, much of the innovation in web technologies is now focused on consumer facing applications. Although ...