Sökning: "Perturbations"

Visar resultat 11 - 15 av 398 avhandlingar innehållade ordet Perturbations.

  1. 11. Structural algorithms and perturbations in differential-algebraic equations

    Författare :Henrik Tidefelt; Torkel Glad; Mats Jirstrand; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; differential-algebraic equations; index reduction; singular perturbation; Automatic control; Reglerteknik;

    Sammanfattning : Den kvasilinjära formen av differential-algebraiska ekvationer är både en mycket allmängiltig generalisering av den linjära tidsinvarianta formen, och en form som visar sig lämpa sig väl för indexreduktionsmetoder som vi hoppas ska komma att bli både praktiskt tillämpbara och väl förstådda i framtiden.Kuperingsalgoritmen (engelska: the shuffle algorithm) användes ursprungligen för att bestämma konsistenta initialvillkor för linjära tidsinvarianta differential-algebraiska ekvationer, men har även andra tillämpningar, till exempel det grundläggande problemet numerisk integration. LÄS MER

  3. 12. Early perturbations in lipid metabolism in insulin resistance

    Författare :Else Hellebö Johanson; Göteborgs universitet; []
    Nyckelord :insulin resistance; nateglinide; peak VO2; postprandial; relatives; triglyceride-rich lipoproteins; visceral fat; VLDL;

    Sammanfattning : Subjects with the Metabolic Syndrome with or without type 2 diabetes are at excess risk for developing cardiovascular disease. The mechanisms are still not completely understood. Resistance to insulin-stimulated glucose uptake is associated with several metabolic and hemostatic risk factors for cardiovascular disease. LÄS MER

  4. 13. Spectroscopic data and multivariate analysis : tools to study genetic perturbations in poplar trees

    Författare :Susanne Wiklund; Ulf Edlund; Olav Kvalheim; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NMR spectroscopy; Metabolomics; Degree of methylation; S-plot; SUS-plot; Metabonomics; Poplar; MLR; PLS; OPLS; PCA; Pectin; Wood; Organic chemistry; Organisk kemi;

    Sammanfattning : In our society in the 21st century one of the greatest challenges is to provide raw materials to the industry in a sustainable way. This requires increased use of renewable raw materials such as wood. Wood is widely used in pulp, paper and textile industries and ongoing research efforts aim to extend the use of wood in e.g. LÄS MER

  5. 14. The benthic meiofauna of three coastal areas : structure, seasonal dynamics and response to environmental perturbations

    Författare :Bertil Widbom; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Marine biology; Benthos; Meiofauna;

    Sammanfattning : .... LÄS MER

  7. 15. Noise Applications in Light Water Reactors with Traveling Perturbations

    Författare :Victor Dykin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Green s function technique; transit times; decay ratio; cross-correlation function; void fraction; global and regional instabilities; propagating density perturbation; BWR stability; reduced order models; non-white driving force; local component; Monte Carlo; space-dependent neutron noise; density wave oscillations;

    Sammanfattning : Neutron noise induced by perturbations traveling with the coolant of light water reactors (LWRs) is investigated. Different methods to simulate the effect of propagating perturbations are considered. The studies are performed in both open- and closed-loop systems and summarized in three chapters. LÄS MER