Sökning: "pulse propagation"

Visar resultat 21 - 25 av 78 avhandlingar innehållade orden pulse propagation.

  1. 21. Development and Applications of a Laser-Wakefield X-ray Source (updated)

    Författare :Isabel Gallardo Gonzalez; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser-wakefield acceleration; betatron radiation; ionization-induced trapping; direct laser acceleration; laser-wakefield merging; warm dense matter; phase-contract imaging;

    Sammanfattning : In laser-wakefield acceleration (LWFA), a femtosecond laser pulse is tightly focused in a gas to intensities exceeding 1018 W/cm2 . The laser radiation ionizes the medium and excites a plasma wave that travels behind the laser pulse. LÄS MER

  3. 22. Time and Frequency Domain Measurement Methods for High Frequency Characterisation of Power Cables

    Författare :Ruslan Papazyan; KTH; []
    Nyckelord :Attenuation measurement; XLPE insulation; Power cables;

    Sammanfattning : Time Domain Reflectometry (TDR) has been used forlocalisation of transmission line discontinuities in variousapplications. One of the challenges when applying TDR on powercables is to obtain knowledge of the high frequencycharacteristics of both the degraded and the undegradedsections of the cable. LÄS MER

  4. 23. Ultrasonic measurement technology for characterization of pulp fibre suspensions

    Författare :Torbjörn Löfqvist; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industrial Electronics; Industriell elektronik;

    Sammanfattning : In the papermaking industry, there is a need for sensors to measure the properties of the fibre suspension that determine important parameters in the finished paper. This lack of on-line sensors hampers the development of advanced process control strategies. LÄS MER

  5. 24. Contributions to the Study of Nonlinear Optics

    Författare :Mats Desaix; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Nonlinear optics, the study of how high intensity light propagates through and interacts with matter, is a subject which is rich in scientific problems and offers many technologically important applications. In this thesis, a number of physical and mathematical problems concerning nonlinear Kerr media are addressed. LÄS MER

  7. 25. On Nonlinear Acoustics in Contrast Echocardiography

    Författare :Marcus Ressner; Birgitta Janerot-Sjöberg; Per Ask; Tomas Jansson; Hans Torp; Linköpings universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Ultrasound is one of the most commonly used noninvasive medical imaging techniques. Ultrasound contrast agents (UCA), consisting of encapsulated gas-filled microbubbles, have shown to increase the diagnostic precision in selected low echogenic patients. LÄS MER