Sökning: "high intensity"

Visar resultat 1 - 5 av 903 avhandlingar innehållade orden high intensity.

  1. 1. Temporal Aspects of High-Intensity Laser-Matter Interactions

    Författare :Johan Mauritsson; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Particle Acceleration; Laser technology; Relativistic Self-Focusing; High-Intensity Lasers; Attosecond Pulses; Pulse Characterization; XUV; High-Order Harmonics; Ultrashort Pulses; Laserteknik; Atom- och molekylärfysik; Atomic and molecular physics; Fysicumarkivet A:2003:Mauritsson;

    Sammanfattning : The availability of short-pulse, high-intensity lasers has opened doors to new areas in atomic and plasma physics. The short pulses (a few femtoseconds), that are available today, enable unprecedented temporal measurements, while the high peak power accessible (several terawatts) allows physicists to study the interaction between light and relativistic plasmas. LÄS MER

  2. 2. High intensity and high gradient magnetic separation in mineral processing

    Författare :Jan A. Jirestig; Luleå tekniska universitet; []

    Sammanfattning : Natural minerals often lack well defined magnetic susceptibilities. Instead they must be thought of as occurring in a susceptibility range where the bulk susceptibility is affected by present impurities. Inclusions or foreign atoms in solid solution may alter a materials magnetic properties to a large extent. LÄS MER

  3. 3. Effects of high intensity focused ultrasound on the intervertebral disc

    Författare :Johan K Persson; Björn Strömqvist; Carina Forslund; Lars Lidgren; Ian McCarthy; Lund Ortopedi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; medical instrumentation; tomography; radiology; Clinical physics; Biofysik; Biophysics; Thermal therapy; Disc herniation; Intervertebral disc; High intensity focused ultrasound; Klinisk fysiologi; radiologi; tomografi; medicinsk instrumentering; thermal therapy; HIFU; disc herniation;

    Sammanfattning : The purpose of this study was to study and try to optimise high intensity focused ultrasound treatment of the intervertebral disc. We demonstrated that it was possible to heat intervertebral discs with HIFU delivered by 50 or 5 mm diameter ultrasound transducers. LÄS MER

  4. 4. Generation of coherent short-wavelength radiation --- High-order harmonics and x-ray lasers

    Författare :Tomas Starczewski; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Atomic and molecular physics; short-wavelength radiation; coherence; high-intensity lasers; high-order harmonics; x-ray lasers; Atom- och molekylärfysik;

    Sammanfattning : The recent availability of short-pulse, high-intensity, compact lasers has opened doors to new and fascinating areas in atomic physics. Using the Lund Terawatt Laser, the interaction of femtosecond, near-infrared and visible laser radiation with matter at intensities in the range 1013--1017 W/cm2 was studied. LÄS MER

  5. 5. High-Order Harmonics- Characterisation, Optimisation and Applications

    Författare :Claire Lyngå; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; high-harmonic generation; VUV spectroscopy; high-power lasers; Atomic and molecular physics; radiative lifetimes; XUV spectroscopy; Atom- och molekylärfysik; Fysicumarkivet A:1999:Lyngå;

    Sammanfattning : Recent advances in laser technology, with the development of extremely short-pulse, high-intensity lasers, have opened doors to new areas in atomic physics. By focusing light from an intense, short-pulse laser into a gas jet, the emission of high-order harmonics of the laser frequency has been studied. LÄS MER