Essays about: "Spectral Iterative Method"

Showing result 1 - 5 of 6 essays containing the words Spectral Iterative Method.

1. 1. Subgrid finite volume preconditioner for Discontinuous Galerkin implemented in the DUNE framework

   University essay from Lunds universitet/Matematik LTH

   Author : Johannes Kasimir; [2021]
   Keywords : discontinuous galerkin spectral element method; dune; high performance computing; numerical analysis; numerical methods; fluid dynamics; simulation; multigrid; iterative methods; Technology and Engineering;

   Abstract : A Jacobian free multigrid preconditioner for linear problems arising from Implicit Discontinuous Galerkin (DG) discretizations is implemented. The preconditioner is based on a multigrid method for a low order Finite volume (FV) discretization on a subcellgrid. L2-projections are introduced as a strategy to translate between the discretizations. READ MORE

3. 2. Reconstruction of Hyperspectral Images Using Generative Adversarial Networks

   University essay from Linköpings universitet/Reglerteknik

   Author : Jacob Eek; [2021]
   Keywords : Coded aperture snapshot spectral imaging; CASSI; Raman; Raman spectroscopy; Explosive; Detection; Hyperspectral Image; HSI; Compressed sensing; Compressive Sensing; CS; Machine Learning; Reconstruction; Inverse problem; Generative Adversarial Network; GAN; CGAN; BEGAN; Latent variable optimization;

   Abstract : Fast detection and identification of unknown substances is an area of interest for many parties. Raman spectroscopy is a laser-based method allowing for long range no contact investigation of substances. READ MORE

4. 3. Computation of Stationary States for Rotating Bose-Einstein Condensates using Spectral Methods

   University essay from KTH/Skolan för teknikvetenskap (SCI)

   Author : Adam Erlandsson; Paul Hedvall; [2020]
   Keywords : ;

   Abstract : The Bose-Einstein condensate is a phase of matter that arises when cooling gases of bosons to extremely low temperatures. When studying these condensates one may use the Gross-Pitaevskii equation, which is a non-linear variant of the Schrödinger equation. READ MORE

5. 4. Analytical Investigation of Planetary Gears Instabilities and the Impact of Micro-Macro Geometry Modifications

   University essay from KTH/Farkostteknik och Solidmekanik

   Author : Hamza Oudich; [2020]
   Keywords : Planetary gears; Instabilities; Resonance; Vibration; dynamic response; Spectral Iterative Method; Modal analysis; Static and dynamic transmission error; Gear mesh stiffness; Macro and micro-geometry; Phasing;

   Abstract : Due to their large torque-speed ratio and transmission efficiency, planetary gears are widely used in the automotive industry. However, high amplitude vibrations remain their critical weakness, which limits their usage especially when new strict noise legislations come into action. READ MORE

6. 5. Blood Velocities Estimation using Ultrasound

   University essay from Lunds universitet/Matematisk statistik

   Author : Elham Pirnia; [2013]
   Keywords : Mathematics and Statistics;

   Abstract : This thesis consists of two parts. In the rst part, the iterative data-adaptive BIAA spectral estimation technique was extended to estimate lateral blood velocities using ultrasound scanners. The BIAA method makes no assumption on samples depth or sampling pattern, and therefore allows for transmission in duplex mode imaging. READ MORE