Sökning: "blackbody"

Visar resultat 1 - 5 av 15 avhandlingar innehållade ordet blackbody.

  1. 1. Measurement of temperature and burning-rate in solid fuel combustors by fiber-optical techniques

    Författare :Dan Ericsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fiber-optic; blackbody; open-end; response-time; harsh atmosphere; hydroxyl-terminated; polybutadiene; solid-fuel ram-jet; temperature; burning-rate;

    Sammanfattning : .... LÄS MER

  3. 2. Thermal components in the early X-ray afterglow of gamma-ray bursts

    Författare :Vlasta Valan; Josefin Larsson; Yvonne Becherini; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics;

    Sammanfattning : Gamma-ray bursts (GRBs) are still puzzling scientists even 40 years after their discovery. Questions concerning the nature of the progenitors, the connection with supernovae and the origin of the high-energy emission are still lacking clear answers. Today, it is known that there are two populations of GRBs: short and long. LÄS MER

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

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

    Sammanfattning : 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. LÄS MER

  5. 4. Lessons learned from time-resolved X-ray spectra of gamma-ray bursts

    Författare :Vlasta Valan; Josefin Larsson; Nederländern Professor Andrew Levan Nederländern Radboud Universiteit Andrew Levan; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Sammanfattning : Gamma-ray bursts (GRBs) are among the brightest and most energetic phenomena in the Universe, observed up to great distances. The early X-ray emission ofgamma-ray bursts are usually well described by absorbed power laws. However,in some cases, additional thermal components have been identified. LÄS MER

  7. 5. Radiative lifetimes of bound excited states in anions : Measurements on long-lived metastable states in atomic anions

    Författare :Odd Magnar Hole; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fysik; Physics;

    Sammanfattning : This thesis presents and discusses the results of measurements of the intrinsic lifetimes of bound excited anionic states. The results are valuable for evaluation of different theoretical models and computation methods and are compared to calculations when available. LÄS MER