Search for dissertations about: "high-frequency"

Showing result 21 - 25 of 729 swedish dissertations containing the word high-frequency.

  2. 21. Uncertainty quantification for high frequency waves

    Author : Gabriela Malenova; Olof Runborg; Daniel Appelö; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : We consider high frequency waves satisfying the scalar wave equationwith highly oscillatory initial data. The speed of propagation of the mediumas well as the phase and amplitude of the initial data is assumed to beuncertain, described by a finite number of independent random variables withknown probability distributions. READ MORE

  4. 22. Uncertainty quantification for high frequency waves

    Author : Gabriela Malenova; Olof Runborg; Fabio Nobile; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Matematik;

    Abstract : We consider high frequency waves satisfying the scalar wave equation with highly oscillatory initial data represented by a short wavelength ε. The speed of propagation of the medium as well as the phase and amplitude of the initial data is assumed to be uncertain, described by a finite number of independent random variables with known probability distributions. READ MORE

  5. 23. Fast Adaptive Numerical Methods for High Frequency Waves and Interface Tracking

    Author : Jelena Popovic; Olof Runborg; Hongkai Zhao; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; high frequency waves; Helmholtz equation; interface tracking; time-space adaptivity; multiresolution; Hamilton-Jacobi;

    Abstract : The main focus of this thesis is on fast numerical methods, where adaptivity is an important mechanism to lowering the methods' complexity. The application of the methods are in the areas of wireless communication, antenna design, radar signature computation, noise prediction, medical ultrasonography, crystal growth, flame propagation, wave propagation, seismology, geometrical optics and image processing. READ MORE

  6. 24. High Frequency Analysis of LDMOS Transistors

    Author : Johan Ankarcrona; Uppsala universitet; []
    Keywords : ;

    Abstract : .... READ MORE

  7. 25. High Frequency Characterization and Modeling of SiGe Heterojunction Bipolar Transistors

    Author : B. Gunnar Malm; KTH; []
    Keywords : Silicon-Germanium SiGe ; heterojunction bipolar transistor HBT ; low-frequency noise; high-frequency noise; harmonic distortion; linearity; device simulation; collector profile; epitaxial base integration; radio frequency RF ; radio frequency inte;

    Abstract : .... READ MORE