Sökning: "Parametric Excitations"
Hittade 2 uppsatser innehållade orden Parametric Excitations.
1. Towards a setup for narrowband terahertz generation through difference-frequency mixing of chirped ultrashort pulses
Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionenSammanfattning : Terahertz radiation is a useful tool for inducing lower-energy excitations in matter, where it can be used to cause structural changes through direct interaction with the crystal lattice. Sub-picosecond optical pulses can be used to generate intense broadband terahertz pulses through optical rectification in nonlinear crystals, reaching peak electric fields of several MV/m and conversion efficiencies as high as a few percent. LÄS MER
2. Study on Vibrations induced by Parametric Excitations on Strings
Magister-uppsats, Blekinge Tekniska Högskola/Avdelningen för maskinteknikSammanfattning : The present thesis work studies the parametrically excited vibrations on bridge stay cables when the natural frequency of the bridge tower is half of the resonance frequency of the cable. This condition is found at the longest stay cables of the Øresund Bridge. LÄS MER