Sökning: "a posteriori error estimation"

Visar resultat 26 - 30 av 36 avhandlingar innehållade orden a posteriori error estimation.

1. 26. On the Impact of Phase Noise in Communication Systems –- Performance Analysis and Algorithms

   Författare :Rajet Krishnan; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Oscillator; phase noise; sum-product algorithm SPA ; random matrix theory; variational Bayesian method; massive MIMO; symbol error probability; maximum a posteriori MAP detection; constellations; extended Kalman filter EKF ; maximum likelihood ML detection; mutual information; multiple-input multiple-output MIMO ; factor graph; free probability.;

   Sammanfattning : The mobile industry is preparing to scale up the network capacity by a factor of 1000x in order to cope with the staggering growth in mobile traffic. As a consequence, there is a tremendous pressure on the network infrastructure, where more cost-effective, flexible, high speed connectivity solutions are being sought for. LÄS MER

3. 27. High Performance Adaptive Finite Element Methods : With Applications in Aerodynamics

   Författare :Niclas Jansson; Johan Hoffman; Johan Jansson; Vincent Heuveline; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The massive computational cost for resolving all scales in a turbulent flow makes a direct numerical simulation of the underlying Navier-Stokes equations impossible in most engineering applications. Recent advances in adaptive finite element methods offer a new powerful tool in Computational Fluid Dynamics (CFD). LÄS MER

4. 28. On error controlled atomistic-to-continuum modeling with application to graphene monolayers

   Författare :Arash Memarnahavandi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Quasi-Continuum; stress-free; atomistic-to-continuum; homogenization; adaptivity;

   Sammanfattning : In order to consider virtual materials, i.e. materials that are not manufactured yet, it can be advantageous to model physical phenomena on a lower length scale than the macroscopic one. In such a case, homogenization (or coarse-graining) can be a useful tool. LÄS MER

5. 29. An adaptive finite element method for the compressible Euler equations

   Författare :Murtazo Nazarov; Johan Hoffman; Mats Larsson; KTH; []
   Nyckelord :;

   Sammanfattning : This work develops a stabilized finite element method for the compressible Euler equations and proves an a posteriori error estimate for the approximated solution. The equations are approximated by the cG(1)cG(1) finite element method with continuous piecewise linear functions in space and time. LÄS MER

7. 30. Efficient and Reliable Simulation of Quantum Molecular Dynamics

   Författare :Katharina Kormann; Sverker Holmgren; Gunilla Kreiss; Hans O. Karlsson; Christian Lubich; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; time-dependent Schrödinger equation; quantum optimal control; exponential integrators; spectral elements; radial basis functions; global error control and adaptivity; high-performance computing implementation; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

   Sammanfattning : The time-dependent Schrödinger equation (TDSE) models the quantum nature of molecular processes.  Numerical simulations based on the TDSE help in understanding and predicting the outcome of chemical reactions. LÄS MER