Viser treff 2916-2935 av 4753

    • nsroot: Minimalist process isolation tool implemented with Linux namespaces 

      Raknes, Inge Alexander; Fjukstad, Bjørn; Bongo, Lars Ailo Aslaksen (Journal article; Tidsskriftartikkel, 2017-11-26)
      Data analyses in the life sciences are moving from tools run on a personal computer to services run on large computing platforms. This creates a need to package tools and dependencies for easy installation, configuration and deployment on distributed platforms. In addition, for secure execution there is a need for process isolation on a shared platform. Existing virtual machine and container ...
    • Nudging according to user’s preferences 

      Saleem, Sufyan (Mastergradsoppgave; Master thesis, 2022-11-15)
      Physical inactivity has been identified as a global pandemic, physical inactivity causes multiple health outcomes in different demographic group such as coronary heart disease, type 2 diabetes, colon, and breast cancer. A physical inactive person takes less than 5000 steps a day. To try to reduce physical inactivity along individual for healthy lifestyle, this thesis provides personalized digital ...
    • Numerical Analysis of Microwave Scattering from Layered Sea Ice Based on the Finite Element Method 

      Xu, Xu; Brekke, Camilla; Doulgeris, Anthony Paul; Melandsø, Frank (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-21)
      A two-dimensional scattering model based on the Finite Element Method (FEM) is built for simulating the microwave scattering of sea ice, which is a layered medium. The scattering problem solved by the FEM is formulated following a total- and scattered-field decomposition strategy. The model set-up is first validated with good agreements by comparing the results of the FEM with those of the small ...
    • Numerical and experimental evaluation of high-frequency unfocused polymer transducer arrays 

      Habib, Anowarul; Wagle, Sanat; Decharat, Adit; Melandsø, Frank (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-12)
      High-frequency unfocused polymer array transducers are developed using an adhesive-free layer-by-layer assembly method. The current paper focuses on experimental and numerical methods for measuring the acoustic performance of these types of array transducers. Two different types of numerical approaches were used to simulate the transducer performance, including a finite element method (FEM) study ...
    • Numerical and experimental investigation of absorbing polymer films suitable for boundary photoacoustic imaging 

      Salmi, Marte Helene Skogdahl (Master thesis; Mastergradsoppgave, 2020-07-13)
      One of the main challenges in conventional photoacoustic methods, is that thin biological samples typically have low optical absorption in the visible region. Therefore, it is often necessary to stain or label the sample with a color which provide sufficient absorption for the laser wavelength used in the scanning system. Unfortunately, the labeling often introduce unwanted properties to the biological ...
    • Numerical calculation of Casimir forces 

      Kilen, Isak Ragnvald (Master thesis; Mastergradsoppgave, 2012-06-19)
      In this thesis a set of regularized boundary integral equation are introduced that can be used to calculate the Casimir force induced by a two dimensional scalar field. The boundary integral method is compared to the functional integral method and mode summation where possible. Comparisons are done for the case of two parallel plates, two concentric circles and two adjacent circles. The results ...
    • Numerical computations of turbulent motions in magnetized plasmas 

      Decristoforo, Gregor (Master thesis; Mastergradsoppgave, 2016-05-18)
      Intermittent fluctuations and turbulence-induced transport of magnetically confined fusion plasmas are investigated by numerical computations. A reduced fluid model describing the evolution of plasma pressure and electric drift vorticity in a two-dimensional plane perpendicular to the magnetic field is derived. A numerical simulation code implemented on graphical processing units is presented. We ...
    • Numerical evaluation of line, surface and toroidal integrals on level sets of toroidally symmetric functions 

      Wiesenberger, Matthias; Gerrú, Raul; Held, Markus (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-05)
      We investigate strategies to numerically integrate closed lines and surfaces that are implicitly defined by level sets (iso-contours) of continuously differentiable toroidally symmetric functions. The “grid-transform” approach transforms quantities given in non-surface-aligned coordinates onto a numerically constructed surface-aligned grid. Here, line and surface integrals, as well as so-called ...
    • Numerical Investigation of Radiative Hybrid Nanofluid Flows over a Plumb Cone/Plate 

      Peter, Francis; Sambath, Paulsamy; Dhanasekaran, Seshathiri (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-18)
      Non-Newtonian fluids play a crucial role in applications involving heat transfer and mass transfer. The inclusion of nanoparticles in these fluids improves the efficiency of heat and mass transfer processes. This study employs a numerical solution approach to examine the flow of non-Newtonian hybrid nanofluids over a plumb cone/plate surface, considering the effects of magnetohydrodynamics (MHD) and ...
    • Numerical investigation on the cage-to-cage wake effect: A case study of a 4 × 2 cage array 

      Sim, Jaesub; Cheng, Hui; Aarsæther, Karl Gunnar; Li, Lin; Ong, Muk Chen (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-12)
      Aquaculture has been the world’s fastest-growing food producing method and grown to become the second-largest export industry in Norway during the past 40 years. Usually, the high-value fish such as Atlantic Salmon (<i>Salmo salar</i>) is raised in a multi-cage fish farm, where the flow interactions between fish cages exist. In this study, the interactions between fish cages are implemented into the ...
    • "Numerical modeling of microwave interactions with sea ice" 

      Kampffmeyer, Michael Christian (Master thesis; Mastergradsoppgave, 2014-06-02)
      Remote sensing is a key instrument for monitoring sea ice surface properties over large areas. Synthetic Aperture Radar (SAR) as well as Real Aperture Radar (RAR) are two types of radars that are extensively used in this context and measure the backscatter of the surface that they illuminate. Backscattering of waves from rough surfaces is complicated and depends, among other things, on the roughness ...
    • Numerical Simulation of Microwave Scattering from Sea Ice Based on The Finite Element Method 

      Xu, Xu; Doulgeris, Anthony Paul; Melandsø, Frank; Brekke, Camilla (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-03)
      In this paper, a 2-dimensional scattering model for sea ice based on the Finite Element Method (FEM) is presented. The scattering problem is formulated following a physics-separate strategy. The wave in the air domain is expressed by the scattered field formulation, while the wave in the sea ice domain is expressed by the total field formulation. The two separate physics and formulations are coupled ...
    • Numerical simulations and stochastic modeling of intermittent fluctuations in magnetized plasmas 

      Decristoforo, Gregor (Doctoral thesis; Doktorgradsavhandling, 2021-05-21)
      The exhaust of particles and heat in the boundary of contemporary magnetic confinement experiments remains to this day a major obstacle on the road to commercially viable fusion energy production. It is recognized, that coherent structures of hot and dense plasma, called blobs or filaments, are the dominant mechanism for cross-field particle transport. These filaments are created by plasma turbulence ...
    • Numerical Simulations of Turbulence at the Boundary of Fusion Plasma 

      Jäntti, Henrik (Mastergradsoppgave; Master thesis, 2022-05-15)
      Numerical simulations of reduced fluid models describing magnetized plasmas have previously been used to study the boundary of fusion plasmas extensively. A common approximation applied to these models is the so-called Boussinesq approximation. One of the requirements for the Boussinesq approximation to be applicable is that the background particle density is significantly higher than the fluctuations ...
    • Numerical Solution of the Parametric Diffusion Equation by Deep Neural Networks 

      Geist, Moritz; Petersen, Philipp; Raslan, Mones; Schneider, Reinhold; Kutyniok, Gitta Astrid Hildegard (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-05)
      We perform a comprehensive numerical study of the effect of approximation-theoretical results for neural networks on practical learning problems in the context of numerical analysis. As the underlying model, we study the machine-learning-based solution of parametric partial differential equations. Here, approximation theory for fully-connected neural networks predicts that the performance of the ...
    • Numerical studies of radial filament motion in toroidally confined plasmas 

      Kube, Ralph (Master thesis; Mastergradsoppgave, 2010-05)
      Numerical studies of radial filament motions in the SOL of toroidally confined plasmas are studies. We use a two dimensional two-field model to characterize blob-like structures in the radial-poloidal domain. These structures are observed to achieve velocities in the order of the ion acoustic velocity in the SOL of tokamaks and other toroidal confinement devices. By numerical means we find a ...
    • A numerical study of planar elliptical antennas applied to ultrawideband (UWB) imaging of breast tissue 

      Brelum, Sindre Holsbøe (Master thesis; Mastergradsoppgave, 2008-08)
      The thesis discusses the possibility of using ultrawideband (UWB) radar to detect breast cancer. At the present time, X-ray mammography and ultrasound are the golden standard imaging techniques for detection and evaluation of breast cancer, but they both have their limitations. UWB radar utilizes the difference in dielectric properties between a tumor and the surrounding healthy tissue. By interpreting ...
    • Numerisk modellering av absorberende randbetingelser for ultralydbølger i væsker og elastiske materialer 

      Grønmo, Tor Arne (Master thesis; Mastergradsoppgave, 2015-06-01)
      Simuleringer av utbredelse av ultralydbølger i elastiske polymerer og i væsker ble utført med et kommersielt simuleringsverktøy, COMSOL Multiphysics, basert på endelig element metode. Simuleringer ble utført i en- og to-dimensjoner. Undersøkelser ble utført for å finne ut ved hvilke oppløsninger av tid og rom ga stabile simuleringer. For en to-dimensjonal modell basert på en elastisk ...
    • The Nussir copper deposit: petrology, mineralogy, geochemistry and distribution of ore mineralization 

      Mun, Yulia (Master thesis; Mastergradsoppgave, 2013-06-28)
      The geology, petrography, mineralogy and geochemistry of the Nussir copper deposit in Finnmark, Northern Norway were studied during writing this thesis. The Nussir deposit of copper is a sedimentary-hosted hydrothermal deposit affected by low grade methamorphism and ductile deformation. The copper mineralization includes chalcopyrite, chalcocite, bornite, covellite, and digenite. The deposit contains ...
    • Nær-orthogonale eksperimenter i organiske syntesereaksjoner 

      Simonsen, Geir (Master thesis; Mastergradsoppgave, 2010-04)
      I avhandlingen prøver jeg å vise hvordan nær-othhogonale eksperimenter kan brukes i screeningforsøk