Sökning: "time-resolved"

Visar resultat 31 - 35 av 65 uppsatser innehållade ordet time-resolved.

  1. 31. In-line Phase-contrast Tomography using Betatron X-rays Produced by a Laser-Plasma Accelerator

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Kristoffer Svendsen; [2017]
    Nyckelord :source size; x-ray; in-line; phase-contrast; phase contrast; LWFA; laser wakefield acceleration; tomography; diffraction; diffraction simulation; laser-plasma acceleration; Physics and Astronomy;

    Sammanfattning : X-ray phase-contrast imaging is a powerful technique that allows great resolving power for low absorbing samples, such as biological tissue. This method relies on measuring the phase shift induced by the sample instead of the absorption traditional radiography relies on. LÄS MER

  3. 32. Electric Field Domains in Quantum Cascade Lasers

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

    Författare :Tim Almqvist; [2017]
    Nyckelord :quantum cascade laser; QCL; electric field domain; EFD; NDR; negative differential resistivity; simulations; Tim; Almqvist; kvantkaskadlaser; Physics and Astronomy;

    Sammanfattning : Quantum cascade lasers (QCLs) are periodic semiconductor heterostructures, capable of producing laser gain. They have become an important source of coherent radiation in the mid infrared, and THz frequency regions. QCLs are non-linear electric devices, and often have bias regions of negative differential resistivity (NDR). LÄS MER

  4. 33. The impact on the morphology of the active layer from an organic solar cell by using different solvents

    Kandidat-uppsats,

    Författare :Robbert Schelfhout; [2017]
    Nyckelord :organic solar cells; polymer solar cells; morphology of active layer; polymer blend; solvent annealing; spin coating; dip coating; time resolved fluorescence; steady state fluorescence; absorption spectroscopy; atomic force microscopy;

    Sammanfattning : The rise in the world population can be correlated with an increase in energy need. Fossil fuels are not going to able to cover this need in energy because not only are they limited, they also have a negative effect on the environment. A reason the more to switch renewable energy. One of the most popular renewable energy source is solar energy. LÄS MER

  5. 34. Investigating the stability of a laser-based plasma x-ray source

    Kandidat-uppsats, Lunds universitet/Kemisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Fredrik Parnefjord Gustafsson; Jens Uhlig; Wilfred Fullagar; Amal El Nahhas; [2016]
    Nyckelord :pulse energy; pointing; TES; transmission-edge-sensor; EXAFS; spectrum; spectroscopy; absorption; emission; time-resolved; Brunel mechanism; vacuum heating; water-jet; CCD; andor; LPXS; x-ray; plasma; laser; fluctuations; stability; pixel detector; beam profile sensor; resonant absorption; beam position; Physics and Astronomy;

    Sammanfattning : The use of laser based plasma x-ray sources (LPXS) has quickly expanded during the past decades due to rapid development of ultrafast laser systems. These sources are used in many research applications such as emission, absorption and particularly time-resolved spectroscopy. LÄS MER

  7. 35. Element-Specific Magnetization Dynamics Using T-MOKE at the HELIOS Laboratory

    Kandidat-uppsats, Uppsala universitet/Molekyl- och kondenserade materiens fysik

    Författare :Fredrik Stångberg Valgeborg; [2016]
    Nyckelord :magnetization dynamics; magnetization; demagnetization; magnetism; element-specific; element-specificity; T-MOKE; MOKE; pump-prob; time-resolved pump-probe; HHG; high-order harmonic generation; overtone generation; HELIOS; magnetiseringsdynamik; magnetisering; avmagnetisering; magnetism; grundämnesspecifik; grundämnesspecificitet; T-MOKE; MOKE; pump-prob; tidsupplöst pump-prob; HHG; övertonsgenerering; HELIOS;

    Sammanfattning : Magnetism is a familiar phenomenon, and is applied in a variety of devices, from simple ones, like compasses, to the more sophisticated magnetic hard disk drives. It is also known that the magnetization of a material can change, for example by heating or by exposure to an external magnetic field. LÄS MER