Essays about: "spectral distribution"

Showing result 21 - 25 of 77 essays containing the words spectral distribution.

  1. 21. Gamma-ray emission and Synchrotron Self-Compton modelling of the macrolensed Quasar PKS 1830-211

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

    Author : Pierre Ohlsson; [2020]
    Keywords : Gamma-ray;

    Abstract : The objective of this thesis is to retrieve Light Curves, Spectral Models, Spectral Maps, and to geta Spectral Energy Distribution (SED) plot, for the source of PKS1830-211. Finally, also to do amodelling of the whole SED coming from the source with the JetSet software. Which will then becompared to a previous modelling done by A. A. READ MORE

  3. 22. Relative vegetation height variation and reflectance of herbaceous-dominated patches in Central Sweden

    University essay from Stockholms universitet/Institutionen för naturgeografi

    Author : Jo Santiago; [2020]
    Keywords : vegetation height; reflectance; plant biodiversity; herbaceous vegetation; MSAVI; coefficient of variation of heights; Height Variation Hypothesis;

    Abstract : Semi-natural landscapes are recognized as suitable habitats for different plant species and provide ecosystem services that contribute to increased plant biodiversity. At the stand level, plant biodiversity is influenced by vegetation structure, of which vegetation height is an important parameter. READ MORE

  4. 23. Efficient Discovery Of Binary Stars

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Author : Pablo Navarro Barrachina; [2020]
    Keywords : Binary Stars; Spectroscopic binary stars; SB2; Machine Learning; Data Mining; Physics and Astronomy;

    Abstract : Purpose: even in the era of exponential increase in the amount of stellar data gathered, binaries are still often overlooked in observational data due to the special handling they require. The goal of this work is to develop a method capable of automatically and efficiently identifying and extract double-lined spectroscopic binaries (SB2) from a spectroscopic survey, while being scalable and technically successful, and to identify and optimize the parameters that influence their detection. READ MORE

  5. 24. Measuring the Characteristic Sizes of Convection Structures in AGB Stars with Fourier Decomposition Analyses : the Stellar Intensity Analyzer (SIA) Pipeline.

    University essay from Uppsala universitet/Teoretisk astrofysik

    Author : Miquel Colom i Bernadich; [2020]
    Keywords : Asymptotic Giant Branch; AGB; red giants; stars; stellar convection; Fourier analysis; convection cells;

    Abstract : Context. Theoretical studies predict that the length scale of convection in stellar atmospheres isproportional to the pressure scale height, which implies that giant and supergiant stars should have convection granules of sizes comparable to their radii. READ MORE

  6. 25. Collisional broadening by hydrogenfor stellar spectroscopy : extension towards high-lying states

    University essay from Uppsala universitet/Teoretisk astrofysik

    Author : Adam Hultquist; [2019]
    Keywords : Astrophysics; Spectral line broadening; ABO; Collisional broadening;

    Abstract : The object of this thesis is to extend the current tables for two useful quantities when calculatingcollisional broadening, the cross-section of interaction and the velocity parameter.These quantities, which have hitherto been tabulated for lower states, have now been calculatedfor higher lying states and are used in the ABO - model for spectral line broadening. READ MORE