Sökning: "Ir"

Visar resultat 6 - 10 av 592 avhandlingar innehållade ordet Ir.

  1. 6. On Radio Frequency Behavioral Modeling : Measurement Techniques, Devices and Validation Aspects

    Författare :Per N. Landin; Peter Händel; Magnus Isaksson; Wendy Van Moer; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; Elektronik;

    Sammanfattning : Effektförstärkare för radiofrekvensapplikationer utgör fortfarande ett av de största problemen i trådlösa kommunikationssystem. Detta beror på att dessa förstärkare är ickelinjära, har låg energieffektivitet och ger mycket distortioner. Bättre verktyg för att förstå och korrigera dessa beteenden är nödvändiga. LÄS MER

  3. 7. Dialogue and revolution : fostering legitimate stakeholder agency in natural resource governance

    Författare :Rasmus Klocker Larsen; C. Leeuwis; Neil Dr.; Wageningen University; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; natural resources; resource management; stakeholders; participation; governance;

    Sammanfattning : This thesis explores how people exert their agency in policy processes that pertain to natural resource governance, and how they construct the required sense of legitimacy for such actions. It also examines the manner in which facilitated multi-stakeholder processes foster legitimate stakeholder agency, and reflects on how they may ensure the rigour of research interventions in situations characterised by intractable uncertainty and controversy. LÄS MER

  4. 8. Analysis of laminar and turbulent flows with turbomachinery, biotechnology and biomechanical applications

    Författare :Gustaf Mårtensson; Arne Johansson; Gertjan van Heijst; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : The goal of this study was initially to gain a better understanding of the effects of rotation on turbulent flow in ducts. Knowledge concerning the influence of rotation on the structures of turbulence is of fundamental importance in many applications, e.g. LÄS MER

  5. 9. Prediction of forced convection heat transfer to Lead-Bismuth-Eutectic

    Författare :Roman Thiele; Henryk Anglart; Martin Rohde; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lead-bismuth-eutectic; Forced convective heat transfer; Turbulence-modeling; GEN-IV reactors;

    Sammanfattning : The goal of this work is to investigate the capabilities of two different commercial codes, OpenFOAM and ANSYS CFX, to predict forced convection heat transfer in low Prandtl number fluids and investigate the sensitivity of these predictions to the type of code and to several input parameters.The goal of the work is accomplished by predicting forced convection heat transfer in two different experimental setups with the codes OpenFOAM and ANSYS CFX using three different turbulence models and varying the input parameters in an extensive sensitivity analysis. LÄS MER

  7. 10. Flame Dynamics and Deflagration-to-Detonation Transition

    Författare :Damir Valiev; Börje Johansson; R. J. M. (Rob) Bastiaans; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; flame; premixed; instability; fractal; deflagration; detonation; DDT; simulation; Physics; Fysik;

    Sammanfattning : Various premixed flame phenomena are studied by means of direct numerical simulations of the complete system of hydrodynamic equations. Rigorous study of flame dynamics is essential for all premixed combustion problems where multidimensional effects cannot be disregarded.The present thesis consists of six parts. LÄS MER