Sökning: "phase shifts"

Visar resultat 21 - 25 av 103 avhandlingar innehållade orden phase shifts.

  1. 21. Modeling and Control of Voltage Source Converters Connected to the Grid

    Författare :Michael Lindgren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; voltage source converter; switching frequency; pulse width modulation; IGBT valve; power electronics; small-signal; L-filter; LCL-filter; transfer function; line filter; active filtering; frequency response; sampling frequency;

    Sammanfattning : This thesis deals with the modeling and control of pulse width modulated (PWM) voltage source converters connected to the grid. When voltage source converters are connected to the grid, the power quality and the dynamic performance are affected by the line filter connected between the converter and the grid, and by nonlinearities caused by the switching converter. LÄS MER

  3. 22. ADC modeling from a system perspective and design of RF-sampling radio receivers

    Författare :Kalle Folkesson; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The analog-to-digital converter (ADC) is the key component in many modem electronic systems. Examples are wire-line communication systems such as digital subscriber line modems, wireless communication systems such as radio receivers, and sensor systems such as military radar. LÄS MER

  4. 23. Rätten till privatlivet : och moralen bakom omoralen i svensk press 1920 – 1980

    Författare :Mattias Hessérus; Torkel Jansson; Lars M Andersson; Ester Pollack; Kim Salomon; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Privacy; Right to Privacy; Media Ethics; Journalism; Media History; History of the Swedish Press; Privatliv; Privatlivets helgd; Pressetik; Journalistik; Publicitetsregler; Presshistoria; Mediehistoria; Svensk press; Historia; History;

    Sammanfattning : This thesis examines the development of the notion of the right to privacy in Sweden between 1920 and 1980. The formation of the notion of the right to privacy is studied through the debate concerning exposure of the aspect of privacy that can be considered the most sensitive: the individual’s sex life and intimate relations. LÄS MER

  5. 24. Magnetic and Structural Properties of f-electron Systems from First Principles Theory

    Författare :Torbjörn Björkman; Olle Eriksson; Thomas Schulthess; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Materialvetenskap; Materials Science;

    Sammanfattning : A series of studies of f-electron systems based on density functional theory methods have been performed.  The focus of the studies has been on magnetic and structural properties, as well as investigating ways to handle strong electron correlation in these systems. LÄS MER

  7. 25. Finite Energy Electronic Correlationsin Low-Dimensional Systems

    Författare :Daniel Bozi; Portugal Universidade do Minho; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis report deals with the 1D Hubbard model and the quantum objects that diagonalize the normal ordered Hubbard hamiltonian, among those the so called PseudoFermions (PFs). These PFs have no residual energy interactions, are eta-spin and spin zero objects, and are the scatterers and the scattering centers of the theory. LÄS MER