Sökning: "accretion"
Visar resultat 16 - 20 av 67 avhandlingar innehållade ordet accretion.
16. Active Galactic Nuclei in galaxy surveys : Empirical paths to the fiery hearts of cosmic beasts
Sammanfattning : Some galaxies emit excessive amounts of light from their centers, caused by accretion of gas onto super-massive black holes (SMBH). These galactic cores are often referred to as Active Galactic Nuclei (AGN) and they come in many different forms, distinguishable by their emission properties. LÄS MER
17. Guided Wave Propagation in Composite Structures; Application to ice detection on wind turbine blades
Sammanfattning : Guided waves are an efficient non-destructive tool in inspection and fault detection of elongated structures. Due to the special characteristics of composite materials, study of guided wave propagation in them has been an interest. LÄS MER
18. Studies of Gas Disks in Binary Systems
Sammanfattning : There are over 300 exoplanets detected through radial velocity surveys and photometric studies showing a tremendous variety of masses, compositions and orbital parameters. Understanding the way these planets formed and evolved within the circumstellar disks they were initially embedded in is a crucial issue. LÄS MER
19. Maternal smoking and foetal growth b interaction with foetal and maternal characteristics
Sammanfattning : In the thesis are analyzed the combined effects of maternal characteristics and cigarettesmoking in pregnancy on foetal growth; and potential interactions with maternalanthropometry, haemoglobin levels in the three trimesters and maternal glucose metabolismin late pregnancy. Foetal growth was assessed through serial ultrasound measurementsfrom second trimester until term and by neonatal anthropometry. LÄS MER
20. Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden
Sammanfattning : The Gällivare area is situated in northern Norrbotten, Sweden, and hosts the Aitik Cu-Au deposit and the Malmberget Fe deposit. In addition, more than 17 mineral prospects and mineralizations are present, among these the currently developed Nautanen Cu-Au deposit. LÄS MER