Sökning: "reduction"

Visar resultat 1 - 5 av 4563 avhandlingar innehållade ordet reduction.

  1. 1. Investigations of the Kinetics of Reduction and Reduction/Carburization of NiO-WO3 Precursors

    Detta är en avhandling från Stockholm : KTH

    Författare :Hesham M. Ahmed; KTH.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Chemical engineering Metallurgical process and manufacturing engineering Metallurgical process engineering; TEKNIKVETENSKAP Kemiteknik Metallurgisk process- och produktionsteknik Metallurgisk processteknik; Reduction; Reduction-Carburization; Gas-solid Reactions; Kinetics; Hydrogen; Methane; Thermogravimetric analysis; Fluidized bed; Simulation; Thermal diffusivity; Thermal conductivity; Laser flash; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Kinetic studies of reduction of the mixtures of NiO and WO3 having different Ni/(Ni+W) molar ratios in flowing hydrogen gas were investigated by means of Thermo Gravimetric Analysis (TGA), Fluidized Bed (FB) technique as well as Thermal diffusivity measurements under isothermal conditions. In the case of TGA, the reaction progress was monitored by mass loss, while evolved gas analysis by a gas chromatograph was the indicator of the reaction progress in the case of FB. LÄS MER

  2. 2. Linear Time-Varying Systems : : Modeling and Reduction

    Detta är en avhandling från Department of Automatic Control, Lund Institute of Technology (LTH)

    Författare :Henrik Sandberg; Lund University.; Lunds universitet.; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; linear time-varying; model reduction; balanced truncation; error bounds; power converters; harmonics; periodic modeling; inverter locomotive;

    Sammanfattning : Linear time-invariant models are widely used in the control community. They often serve as approximations of nonlinear systems. For control purposes linear approximations are often good enough since feedback control systems are inherently robust to model errors. In this thesis some of the possibilities for linear time-varying modeling are studied. LÄS MER

  3. 3. Reduction of Aerodynamic Forcing inTransonic Turbomachinery Numerical Studies on Forcing Reduction Techniques

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Florian Fruth; KTH.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forced Response; Aerodynamic Forcing; Efficiency; Blade Count Ratio; Clocking;

    Sammanfattning : Due to more and more aggressive designs in turbomachinery, assuring the structural integrity of its components has become challenging. Also influenced by this trend is blade design, where lighter and slimmer blades, in combination with higher loading, lead to an increased risk of failure, e.g. in the form of blade vibration. LÄS MER

  4. 4. Some aspects on the reduction of olivine pellets in laboratory scale and in an experimental blast furnace

    Detta är en avhandling från Stockholm : Materialvetenskap

    Författare :Jerker Sterneland; KTH.; [2002]
    Nyckelord :Olivine; pellets; pellet testing; reduction softening melting; MPBO; blast furnace; reduction; quenching; dissection; coating; sticking; coated pellets;

    Sammanfattning : The reduction behaviour of the olivine iron ore pellet MPBOwas studied in laboratory scale at KTH as well as in the LKABexperimental blast furnace. Initially, a newreduction-under-load, or so-called reduction/softening/melting,test equipment was developed. LÄS MER

  5. 5. Breast Hypertrophy and outcome of Breast Reduction Surgery

    Detta är en avhandling från Göteborg : University of Gothenburg

    Författare :Richard Lewin; Göteborgs universitet.; Gothenburg University.; [2016]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Breast; Reduction; Mammaplasty; HRQL; Complications; Validation; Reliability; Breast Hypertrophy; Questionnaire;

    Sammanfattning : Aim: The overall aim of this thesis was to improve our knowledge of breast hypertrophy in women, its associated problems, and the outcome of breast reduction. Patients and methods: I. Five hundred and twelve woman were studied retrospectively for prevalence of and risk factors for complications. II. LÄS MER