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Showing result 1 - 5 of 13 essays matching the above criteria.

1. 1. Investigation of the mean photon energy in Kompaneets spectra

   University essay from KTH/Fysik

   Author : Richárd Bagi; [2023]
   Keywords : Astroparticle Physics; Kompaneets equation; Astropartikelfysik; Kompaneetsekvationen;

   Abstract : The Kompaneets equation describes the spectrum formation when hot fermions are injected into an opaque fermion-photon plasma in thermal equilibrium and inverse Compton-scatterings occur. The equation has three free parameters, the initial plasma thermal energy θ_u, the final plasmathermal energy θ_r and the average photon energy gain y_r. READ MORE

3. 2. Kriging radio environment map construction

   University essay from Luleå tekniska universitet/Rymdteknik

   Author : Erik Lundqvist; [2022]
   Keywords : Kriging; Radio environment; Statistics; Inverse distance weighting;

   Abstract : With the massive increase in usage of some parts of the electromagnetic spectrum during the last decades, the ability to create real time maps of signal coverage is now more important than ever before. This Masters project is designed to test two different methods of generating such maps with a one second limit to processing time. READ MORE

4. 3. A study of the gamma-ray emission from the blazar S50716+71 using the Fermi-LAT telescope

   University essay from Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

   Author : Fredrik Vislander; [2022]
   Keywords : AGN; active galactic nuclei; Fermi-LAT; astrophysics; gamma-rays; synchrotron self-Compton; SSC; S50716 71.;

   Abstract : This thesis sums up a bachelor project in which gamma-ray emission from an extra-galactic source (S50716+71) is studied using data collected by the Fermi Large Area Telescope (LAT). The emission consists of 12,5 years of data (April 2008 to February 2020) in the energy range 100 MeV - 300 GeV. READ MORE

5. 4. Artificial Neural Networks to Solve Inverse Problems in Quantum Physics

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen; Lunds universitet/Fasta tillståndets fysik

   Author : Victor Lantz; [2019]
   Keywords : Artificial Neural Networks; ANN; Deep learning; Quantum physics; Inverse problem; Inverse; Machine learning; Density functional theory; DFT; Physics; Computational physics; Technology and Engineering;

   Abstract : Inverse problems are important in quantum physics as their solutions are essential in order to describe a number of systems using measurable information, e.g. excitation energies or material properties. The problem with inverse problems is that they are usually very hard to solve. READ MORE

6. 5. Diffusion MRI of Brain Tissue: Importance of Axonal Trajectory

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

   Author : Jan Brabec; [2018]
   Keywords : dMRI; diffusion magnetic resonance; axonal trajectory; axonal geometry; undulations; modeling; axons; inverse problem; diffusion spectrum; time-dependent diffusion; Physics and Astronomy;

   Abstract : Obtaining microstructural information non-invasively on brain tissue remains a challenge. Diffusion magnetic resonance imaging (dMRI) is an imaging method that can provide such information. That includes geometrical considerations of nerve cells projections, axons, that are present in the white matter of the human brain. READ MORE