Essays about: "preconditioning"

Showing result 1 - 5 of 8 essays containing the word preconditioning.

  1. 1. Preconditioned iterative methods for PDE-constrained optimization problems with pointwise state constraints

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Anders Ström; [2017]
    Keywords : ;

    Abstract : Optimization problems constrained by partial differential equations (PDEs) arise in a variety of fields when one wants to optimize a system governed by a PDE. The goal is to compute a control variable such that a state variable is as close as possible to some desired state when control and state are coupled by some PDE. READ MORE

  2. 2. Inverse correlation between freeze-thaw survival and storage stability of freeze-dried Lactobacillus reuteri DSM 17938 and a microcalorimetric search for GASP

    University essay from SLU/Department of Molecular Sciences

    Author : Radoslaw Sawicki; [2017]
    Keywords : freeze-drying; lyophilization; Lactobacillus reuteri; probiotic; pH; temperature; freeze-thaw; storage stability; survival; morphology; microscopy; long-term stationary phase; GASP; isothermal microcalorimetry;

    Abstract : Lactobacillus reuteri DSM 17938 is a probiotic bacterium manufactured by the company BioGaia AB and was in focus of this study. If a probiotic product is to confer its benefi-cial health effect to a consumer, it must retain high viability levels during long-term storage. READ MORE

  3. 3. Inversion of 2D Magnetotelluric and Radiomagnetotelluric data with Non-Linear Conjugate Gradient techniques

    University essay from Uppsala universitet/Geofysik

    Author : Dominik Zbinden; [2015]
    Keywords : Numerical solutions; inverse theory; non-linear conjugate gradients; preconditioning; electromagnetic theory; magnetotellurics;

    Abstract : I implemented and tested the method of Non-Linear Conjugate Gradients (NLCG) to invert magnetotelluric (MT) and radiomagnetotelluric (RMT) data in two dimensions. The forward problem and the objective function gradients were computed using finite-difference methods. READ MORE

  4. 4. Performance comparisons of preconditioned iterative methods for problems arising in PDE-constrained optimization

    University essay from Uppsala universitet/Institutionen för informationsteknologi

    Author : Shiraz Farouq; [2015]
    Keywords : ;

    Abstract : The governing dynamics of simple and complex processes, whether physical, biological, social, economic, engineering, or even rather a mere figment of imagination, can be studied via numerical simulations of mathematical models. These models in many cases can be thought to consist of one, or frequently, several coupled partial differential equations (PDEs). READ MORE

  5. 5. Parallel graph coloring : Parallel graph coloring on multi-core CPUs

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Per Normann; [2014]
    Keywords : Parallel graph coloring multi coloring;

    Abstract : In recent times an evident trend in hardware is to opt for multi-core CPUs. This has lead to a situation where an increasing number of sequential algorithms are parallelized to fit these new multi-core environments. The greedy Multi-Coloring algorithm is a strictly sequential algorithm that is used in a wide range of applications. READ MORE