Sökning: "Non-linear dynamics"
Visar resultat 21 - 25 av 179 avhandlingar innehållade orden Non-linear dynamics.
21. A Play of Light and Spins: Excitation and Detection of Non-linear Magnetization Dynamics using Light
Sammanfattning : The excitation and detection of magnetization dynamics play key roles in the field of spintronics and magnonics. In this thesis, we investigate a contactless method of exciting nonlinear magnetization dynamics using a femtosecond pulsed laser, and study the same with a Brillouin Light Scattering (BLS) microscope. LÄS MER
22. Foam modeling including pore gas interaction for crashworthiness analysis
Sammanfattning : Foams are used in vehicles for three main functions: enhancing comfort, e.g.soft foams used in seats cushions, energy absorbtion, e.g. LÄS MER
23. Optimisation and control of shear flows
Sammanfattning : Transition to turbulence and flow control are studied by means of numerical simulations for different simple shear flows. Linear and non-linear optimisation methods using the Lagrange multiplier technique are employed. LÄS MER
24. Strongly non-linear magnetization dynamics in nano-structures: perturbations, multi-mode generation, and topological droplets
Sammanfattning : Spin torque oscillators (STOs) are magnetic nano-devices in which strongly non-linear magnetodynamic phenomena can be excited by current. In this thesis, we study some of these phenomena by means of micromagnetic simulations, analytical calculations, and electrical characterization. Three main subjects are discussed: 1. LÄS MER
25. Acoustical experiments on the non-linear and non-equilibrium behavior of rocks
Sammanfattning : The study of dynamic behavior of non-perfect materials, such as rocks, is a rich topic for developing sensitive material evaluation and damage detection techniques. It has extensive applications in a variety of fields such as Physics, Geology, and Aerospace, Mechanical, Civil, Petroleum, and Material Engineering. LÄS MER