Sökning: "Cosmic Radiation"

Visar resultat 21 - 25 av 44 avhandlingar innehållade orden Cosmic Radiation.

1. 21. Geant4 Monte Carlo Simulations of the International Space Station Radiation Environment

   Författare :Tore Ersmark; Bengt Lund-Jensen; Lembit Sihver; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space physics; Rymdfysik;

   Sammanfattning : A detailed characterization of the proton and neutron induced radiation environment onboard Columbus and the International Space Station (ISS) has been carried out using the Geant4 Monte Carlo particle transport toolkit. Dose and dose equivalent rates, as well as penetrating particle spectra corresponding to incident trapped protons, GCR protons, SPE protons and cosmic ray albedo neutrons are presented. LÄS MER

3. 22. Determination of orbits in the field of a magnetic dipole with applications to the theory of the diurnal variation of cosmic radiation

   Författare :Karl Gustav Malmfors; Stockholms högskola; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

4. 23. Probing the early Universe with B-mode polarization : The Spider instrument, optical modelling and non-Gaussianity

   Författare :Adriaan Judocus Duivenvoorden; Katherine Freese; Jón Emil Gudmundsson; Juan García-Bellido; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmic microwave background; early universe; polarimetry; telescopes; fysik; Physics;

   Sammanfattning : One of the main goals of modern observational cosmology is to constrain or detect a stochastic background of primordial gravitational waves. The existence of such a background is a generic prediction of the inflationary paradigm: the leading explanation for the universe's initial perturbations. LÄS MER

5. 24. Dust in the early universe

   Författare :Erik Elfgren; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

   Sammanfattning : This Licentiate thesis treats the impact of early dust on the Cosmic Microwave Background (CMB). The dust that is studied comes from the first generation of stars, which were hot and short-lived, ending their lives as giant supernovæ. LÄS MER

7. 25. Antiparticle identification studies for the PAMELA satellite experiment

   Författare :Jens Lund; Mark Pearce; Tuneyoshi Kamae; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Space technology; PAMEL; satellites; astroparticle physics; antiparticles; calorimeters; Rymdteknik; Space engineering; Rymdteknik;

   Sammanfattning : The PAMELA satellite experiment will soon be launched and during its 3 year mission perform measurement of charged particle fluxes in the cosmic radiation. PAMELA is specifically designed to identify antiprotons and positrons in the vast background of other charged particles. LÄS MER