Sökning: "polarization control"

Visar resultat 1 - 5 av 28 uppsatser innehållade orden polarization control.

  1. 1. Paristyrets effekt på miljösatsningar i USA : Analys av miljöinvesteringar beroende på politiskt styre i den lagstiftande församlingen utifrån paneldata för amerikanska delstater, 2009-2022.

    Kandidat-uppsats, Uppsala universitet/Nationalekonomiska institutionen

    Författare :Martina Yngvesson; Amanda Nordberg; [2023]
    Nyckelord :US politics; political polarization; environmental investments; US states; legislative control; panel data; Amerikansk politik; politisk polarisering; miljöinvesteringar; amerikanska delstater; lagstiftande kontroll; paneldata;

    Sammanfattning : Studien undersöker politiska partiers inverkan på miljöförbättringar i USA. Vi undersöker även om ökad polarisering mellan republikaner och demokrater har gett upphov till större skillnader i miljöinvesteringar över tid. LÄS MER

  3. 2. Designing Diverse Features to Reduce the Filter Bubble Effect on Social Media

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Ramya Kandula; [2023]
    Nyckelord :Filter bubbles; recommender systems; diversity; social media; filter bubblor; rekommenderande system; mångfald; sociala medier;

    Sammanfattning : The filter bubble effect has been an active area of research that has been explored in various contexts within social media. Research on recommender system designs within filter bubbles has received a lot of attention, mainly due to its impact on the phenomena. LÄS MER

  4. 3. Characterization and Stabilization of Transverse Spatial Modes of Light in Few-Mode Optical Fibers

    Master-uppsats, Linköpings universitet/Informationskodning

    Författare :Oscar Pihl; [2023]
    Nyckelord :spatial modes; Space division multiplexing; SDM; superpositions; LP-modes; few-mode fibers; quantum communication; quantum optics; adaptive optics; stochastic parallel gradient descent; SPGD; mode control; QKD; polarization controller; paddle controller; QRNG; quantum random number generator; spatial modes; perturbation effects;

    Sammanfattning : With the growing need for secure and high-capacity communications, innovative solutions are needed to meet the demands of tomorrow. One such innovation is to make use of the still unutilized spatial dimension of light in communications, which has promising applications in both enabling higher data traffic as well as the security protocols of the future in quantum communications. LÄS MER

  5. 4. Time-resolved x-ray diffraction study of longitudinal optical phonons in zincblende semiconductors

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

    Författare :Lassi Linnala; [2022]
    Nyckelord :femtosecond THz radiation; ultrafast x-ray diffraction; pump-probe; longitudinal optical phonons; zincblende semiconductors; anharmonic decay; density functional perturbation theory; Physics and Astronomy;

    Sammanfattning : Anharmonic decay of longitudinal optical (LO) phonons in zincblende semiconductors is not at present well characterized due to the polar and many-body nature of the problem. Femtosecond THz radiation offers a novel route to this study, as the interaction of this radiation is directly with the phonon lattice and these THz excited phonons do not have enough energy to excite electrons over the band gap. LÄS MER

  7. 5. Investigation of Methods to Improve PZT Sol-Gel Deposition Process for Energy Harvesting Applications

    M1-uppsats, KTH/Hälsoinformatik och logistik

    Författare :Mikael Granberg; [2022]
    Nyckelord :PZT; sol-gel; self-polarization; seed layer; titanium oxidation; PZT; sol-gel; självpolarisering; seedlager; titanoxidering;

    Sammanfattning : The purpose of this work was to investigate ways to modify Silex sol-gel deposition of PZT (PbZrxTi(1-x)O3, Lead Zirconate Titanate) in order to improve its properties for energy harvesting applications. A number of methods to improve the figure of merit for energy harvesting (FOM= e312/ε), cause self-polarization, increase lifetime, reduce cost, increase throughput or simplify processing were tested. LÄS MER