Search for dissertations about: "dark ages"

Showing result 1 - 5 of 13 swedish dissertations containing the words dark ages.

  2. 1. Tomographic study of the 21-cm signal

    Author : Sambit Kumar Giri; Garrelt Mellema; Matthew Hayes; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; dark ages; reionization; first stars – early universe – methods: statistical – radio lines: galaxies – techniques: interferometric – techniques: image processing; Astronomy; astronomi;

    Abstract : The next generation radio telescopes such as the Square Kilometre Array (SKA) will be able to produce images of the redshifted Hi (neutral hydrogen) 21-cm signal from the Epoch of reionization (EoR). In this thesis, we use the simulated tomographic images of the signal and investigate methods to extract and interpret information from those images. READ MORE

  4. 2. Gravitational lensing as a probe of the first stars and galaxies

    Author : Claes-Erik Rydberg; Erik Zackrisson; Lise Christensen; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; stars: Population III; first stars; Galaxies: high-redshift; Galaxies: Population III; dark ages; reionization; techniques: photometric; Astronomy; astronomi;

    Abstract : This thesis investigates the potential for detection and identification of primordial stars, galaxies, and supernovae at high redshift.Simulations indicate that the first Population III stars should appear in minihalos of mass M = 105-106 Msol at z ≈ 10-30. READ MORE

  5. 3. Bothnia dystrophy, a clinical, genetical and electrophysiological study

    Author : Marie Burstedt; Ola Sandgren; Ola Textorius; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Ophtalmology; retinal pigment epithelium; retinitis pigmentosa; neural retina; electroretinogram; cellular retinaldehyde-binding protein; dark adaptometry; retinal degeneration; Oftalmiatrik; Ophtalmology; Oftalmologi; Ophtalmology; oftalmiatrik;

    Abstract : A high frequency of retinitis pigmentosa (RP) is found in Northern Sweden. In an inventory of autosomal recessive RP patients in Västerbotten County, a great number of cases with a unique phenotype was noticed, denoted Bothnia Dystrophy (BD). READ MORE

  6. 4. Molecular Astrophysics in Star-forming Regions with the Odin Satellite

    Author : Carina Persson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The interstellar medium is the cradle of life, stars and planets in the evolving Universe. Stars are born deep inside cold and dark molecular clouds, and affect the dynamical conditions in local regions by powerful winds, outflows, and by supernova explosions. READ MORE

  7. 5. Differential migration in raptors

    Author : Nils Kjellén; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Osprey; Skua; Population monitoring; Bird migration; Satellite telemetry; Animal ecology; Djurekologi;

    Abstract : Differences between ages, sexes and populations in the timing of migration at Falsterbo, Sweden and in the choice of wintering site among raptors in Scania were investigated. Competition and dominance is the best primary explanation to the results. READ MORE