Search for dissertations about: "spectral shaping"

Showing result 11 - 15 of 27 swedish dissertations containing the words spectral shaping.

  2. 11. The Advanced Spectral Leakage (ASL) scheme for simulations of merging neutron stars

    Author : Davide Gizzi; Stephan Rosswog; Evan O'Connor; Albino Perego; Carla Fröhlich; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; hydrodynamics; radiative transfer; neutrinos; stars: neutron; supernovae: general; Astronomy; astronomi;

    Abstract : The detection of a blue macronova following the event GW170817 has emphasized the role that neutrinos play in merging neutron stars. In particular, neutrinos are able to drive mass ejection, the so-called neutrino-driven winds, and change the neutron richness of the matter by absorption. READ MORE

  4. 12. Signal Shaping and Sampling-based Measurement Techniques for Improved Radio Frequency Systems

    Author : Charles Nader; Peter Händel; Niclas Björsell; Wendy Van Moer; Lee Barford; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Wireless communication systems are omnipresent in our day-to-day life, with high expectations regarding capacity, reliability and power efficiency. In order to satisfy the capacity and reliability expectations, today's wireless systems are adopting sophisticated modulation schemes, such as orthogonal frequency division multiplexing (OFDM), which shape today's wireless signals with large bandwidths and high crest factors. READ MORE

  5. 13. Photospheric emission in gamma ray bursts : Analysis and interpretation of observations made by the Fermi gamma ray space telescope

    Author : Shabnam Iyyani; Felix Ryde; David Burrows; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; gamma ray bursts; photosphere; radiation mechanism; Theoretical Physics; teoretisk fysik;

    Abstract : The large flashes of radiation that are observed in GRBs are generally believed to arise in a relativistic jetted outflow. This thesis addresses the question of how and where in the jet this radiation is produced. READ MORE

  6. 14. Digital Baseband Modeling and Correction of Radio Frequency Power Amplifiers

    Author : Per Landin; Peter Händel; Magnus Isaksson; Wendy Van Moer; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Aspects related to behavioral modeling and correction of distortions for radio frequency (RF) power amplifiers (PAs) are treated in the thesis.    When evaluating the performance of a behavioral model it is important to, first of all, use an evaluation criterion, and second, make sure that the criterion actually tells something about the behavior one wishes to describe. READ MORE

  7. 15. Concepts for compact solid-state lasers in the visible and UV

    Author : Sandra Johansson; Fredrik Laurell; Patrick Georges; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; frequency conversion; visible lasers; ultraviolet lasers; KTiOPO4; BiBO; BBO; quasi phase-matching; birefringent phase-matching; solid-state lasers; Physics; Fysik;

    Abstract : In many fields, scientific or industrial, optical devices that can be tailored in terms of spectral qualities and output power depending on the application in question are attractive. Nonlinear optics in combination with powerful laser sources provide a tool to achieve essentially any wavelength in the electromagnetic spectrum, and the advancement of material technology during the last decade has opened up new possibilities in terms of realising such devices. READ MORE