Sökning: "harmonics"

Visar resultat 16 - 20 av 168 avhandlingar innehållade ordet harmonics.

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

   Författare :Tomas Starczewski; Atomfysik; []
   Nyckelord :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

3. 17. High-Order Harmonics- Characterisation, Optimisation and Applications

   Författare :Claire Lyngå; Atomfysik; []
   Nyckelord :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

4. 18. Timing Diagnostics and Coherent Harmonics from a test-FEL

   Författare :Nino Cutic; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Free electron laser; undulator radiation; coherent harmonic generation; circular polariyation; vacuum ultra-violet; seed pulse timing; bunch length; electro-optical spectral decoding;

   Sammanfattning : The test free-electron laser (test-FEL) at MAX-lab in Lund demonstrated for the first time circularly polarized coherent femtosecond pulses at 66 nm wavelength. A 375 MeV electron bunch was seeded by a femtosecond laser at 263 nm and coherent harmonics were extracted in an APPLE-II type elliptical undulator. LÄS MER

5. 19. Current harmonic modeling of aggregated electric vehicle loads in the low voltage grid

   Författare :Georgios Foskolos; Erik Dahlquist; Lennart Söder; Mälardalens högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric Vehicles; current harmonics; modeling; aggregation; power-exponential functions; Energy- and Environmental Engineering; energi- och miljöteknik;

   Sammanfattning : The proliferation of Electric Vehicles (EVs) poses new challenges for the Distribution System Operator (DSO). For example, the rectifiers that are used for charging EV batteries could significantly influence Power Quality (PQ), in terms of harmonic distortion. LÄS MER

7. 20. Global Shape Description of Digital Objects

   Författare :Ola Weistrand; Christer Kiselman; Gunilla Borgefors; Örjan Smedby; Michael Floater; Uppsala universitet; []
   Nyckelord :Applied mathematics; shape description; shape approximation; surface parameterization; digital object; spherical harmonics; digital surface; digital image; Tillämpad matematik;

   Sammanfattning : New methods for global shape description of three-dimensional digital objects are presented. The shape of an object is first represented by a digital surface where the faces are either triangles or quadrilaterals. LÄS MER