Sökning: "radiative processes"

Visar resultat 1 - 5 av 94 avhandlingar innehållade orden radiative processes.

  1. 1. Modeling of radiative processes in organic scintillators

    Författare :Jenny Nilsson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis presents the development of a Monte Carlo calibration of a whole body counter (WBC), consisting of four large plastic (organic) scintillators, used for determine the body burden of gamma-emitting radionuclides. A scintillator emits optical photons after energy has been deposited by an ionizing particle in the scintillator material. LÄS MER

  3. 2. Radiative Heat Transfer in Suspension-Fired Systems

    Författare :Adrian Gunnarsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; co-firing; rotary kiln; combustion; Radiative heat transfer; soot volume fraction;

    Sammanfattning : Radiation is the dominating heat transfer mechanism in most furnaces, and the radiative properties of combustion products represent important aspects regarding its suitability as a heat source. However, fuel and energy markets are undergoing rapid changes due to increasing concerns related to the security of supply and increased global warming. LÄS MER

  4. 3. On the formation of small molecules by radiative association

    Författare :Sergey V. Antipov; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; molecule formation; diatomics; radiative association; resonances; cross sections; rate coefficients;

    Sammanfattning : This thesis is devoted to the theoretical investigation of radiative association, which is one of the processes contributing to formation of molecules in the interstellar medium. The formation of the CN, SiN, SiP and CO molecules through radiative association of the corresponding atoms in their ground electronic states is studied by the means of classical and quantum dynamical calculations. LÄS MER

  5. 4. Photospheric emission from structured, relativistic jets : applications to gamma-ray burst spectra and polarization

    Författare :Christoffer Lundman; Felix Ryde; Andrei Beloborodov; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; photospheric emission; radiative processes; polarization; special relativity;

    Sammanfattning : The radiative mechanism responsible for the prompt gamma-ray burst (GRB) emission remains elusive. For the last decade, optically thin synchrotron emission from shocks internal to the GRB jet appeared to be the most plausible explanation. LÄS MER

  7. 5. An Observational Study of Accretion Processes in T Tauri Stars

    Författare :Henricus Cornelis Stempels; Nikolai Piskunov; Gibor Basri; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; Star formation; T Tauri stars; Emission lines; Accretion; NLTE radiative transfer; Astronomi; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; Astronomi;

    Sammanfattning : This thesis is a detailed observational study of the accretion processes in T Tauri stars (TTS). The interaction between the central star, the circumstellar disk and the magnetic field gives rise to a wide range of features in the spectra of TTS. LÄS MER