Sökning: "scale model"

Visar resultat 16 - 20 av 2633 avhandlingar innehållade orden scale model.

  1. 16. Model Reduction Using Semidefinite Programming

    Författare :Aivar Sootla; Institutionen för reglerteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; semidefinite programming; model reduction; convex optimization;

    Sammanfattning : In this thesis model reduction methods for linear time invariant systems are investigated. The reduced models are computed using semidefinite programming. Two ways of imposing the stability constraint are considered. However, both approaches add a positivity constraint to the program. LÄS MER

  3. 17. Mathematical Modeling of Transport Phenomena in Polymer Electrolyte and Direct Methanol Fuel Cells

    Författare :Erik Birgersson; KTH; []
    Nyckelord :Fuel Cell; DMFC; PEFC; model; visual cell; scale analysis; one-phase; two-phase;

    Sammanfattning : This thesis deals with modeling of two types of fuel cells:the polymer electrolyte fuel cell (PEFC) and the directmethanol fuel cell (DMFC), for which we address four majorissues: a) mass transport limitations; b) water management(PEFC); c) gas management (DMFC); d) thermal management. Four models have been derived and studied for the PEFC,focusing on the cathode. LÄS MER

  4. 18. CALIBRATION OF CHROMATOGRAPHY MODELS

    Författare :Patrik Persson; Avdelningen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; film mass transfer resistance; Kemiteknik och kemisk teknologi; sorption kinetics; external volume; monolithic bed; shallow bed; packed bed; capillary model; detailed model; computer simulation; parameter estimation; diffusion; model calibration; Chromatography; modelling; proteins; Chemical technology and engineering;

    Sammanfattning : AbstractThis thesis is devoted to calibration of mathematical chromatography models. Chromatography models include unknown parameters that must be determined before the models can be applied to optimization or scale-up of a chromatography process. LÄS MER

  5. 19. Validation of a Standard- and Metric-Based Software Quality Model : Creating the Prerequisites for Experimentation

    Författare :Rüdiger Lincke; Växjö universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Software Quality; Metrics; Quality Model; Meta-model; ISO 9126; Computer science; Datalogi; Computer and Information Sciences Computer Science; Data- och informationsvetenskap;

    Sammanfattning : Our long term research goal is to validate a standard- and metric-based software quality model. Today, ambiguous metric definitions lead to incomparable implementation variants in tools. LÄS MER

  7. 20. Hydrological aspects of the carbon balance in a boreal catchment: A model study

    Författare :Alla Yurova; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cartography; pedology; geomorphology; Physical geography; boreal peatland; dissolved organic carbon; ecohydrology; model; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi;

    Sammanfattning : AbstractThe cycling of carbon in its gaseous, solid and dissolved forms is of central importance to ecosystem science, particularly, when the natural carbon cycle has been perturbed by human activity. Mathematical models are commonly used to asses and predict global and regional patterns of terrestrial carbon exchange. LÄS MER