Sökning: "analytic signal"

Visar resultat 21 - 25 av 28 avhandlingar innehållade orden analytic signal.

  1. 21. Simulation of Electro-Optic Modulators by a Time-Domain Beam-Propagation Method

    Författare :Elin Solberg; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; time-domain beam-propagation method; finite element method; tensor products; computational electromagnetics; photonics; electro-optic modulators; finite element method;

    Sammanfattning : Electro-optic modulators (EOMs) are components which convert electric signals to optical ones. They are needed, e.g., at the transmitter end of fiber-optic communication systems and in time-stretch analog-to-digital converters. LÄS MER

  3. 22. Modelling and Analysis of Interconnects for Deep Submicron Systems-on-Chip

    Författare :Dinesh Pamunuwa; KTH; []
    Nyckelord :delay and noise modelling in VLSI circuits; cross-talk; interconnect modelling; timing analysis; transfer function; on-chip bus; bandwidth maximization; throughput maximization; repeater insertion; wire optimization;

    Sammanfattning : The last few decades have been a very exciting period in thedevelopment of micro-electronics and brought us to the brink ofimplementing entire systems on a single chip, on a hithertounimagined scale. However an unforeseen challenge has croppedup in the form of managing wires, which have become the mainbottleneck in performance, masking the blinding speed of activedevices. LÄS MER

  4. 23. Anomaly and Topology : On the axial anomaly, domain wall dynamics, and local topological markers in quantum matter

    Författare :Julia D. Hannukainen; Jens H. Bardarson; Adolfo G. Grushin; Teemu Ojanen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; chiral anomaly; axial anomaly; topological phases of matter; Weyl semimetals; magnetic domain walls; local topological markers;

    Sammanfattning : Chiral anomalies and topological phases of matter form the basis of the research presented in this dissertation. The chiral anomaly is considered both in the context of magnetic Weyl semimetals and in the context of non-Hermitian Dirac actions. LÄS MER

  5. 24. Optimization of High-order Harmonic Generation for Attosecond Science

    Författare :Robin Weissenbilder; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High-order Harmonic Generation; Attosecond Pulse Train; attosecond dynamics; photoelectron interferometry; Quantum state tomography; Phase matching; Fysicumarkivet A:2023:Weissenbilder;

    Sammanfattning : High-order harmonic generation is a highly nonlinear, though inherently inefficient, process which can lead to emission of coherent, broadband extreme ultraviolet radiation in the form of attosecond pulses. Attosecond pulses are crucial for experiments investigating photoionization dynamics on the femto- and attosecond timescales. LÄS MER

  7. 25. Calculation of scatter in cone beam CT : Steps towards a virtual tomograph

    Författare :Alexandr Malusek; Michael Sandborg; Gudrun Alm Carlsson; Michael Ljungberg; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radiology; Radiologi;

    Sammanfattning : Scattered photons—shortly scatter—are generated by interaction processes when photon beams interact with matter. In diagnostic radiology, they deteriorate image quality since they add an undesirable signal that lowers the contrast in projection radiography and causes cupping and streak artefacts in computed tomography (CT). LÄS MER