Search for dissertations about: "head echoes"
Found 3 swedish dissertations containing the words head echoes.
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1. High-resolution meteor exploration with tristatic radar methods
Abstract : A meteor observed with the naked eye is colloquially called a shooting star. The streak of light is generated by an extra-terrestrial particle, a meteoroid, entering the Earth’s atmosphere. The term meteor includes both luminosity detectable by optical means and ionization detectable by radar. READ MORE
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2. Radio meteors above the Arctic Circle : radiants, orbits and estimated magnitudes
Abstract : This thesis presents results based on data collected with the 930 MHz EISCAT UHF radar system and three SKiYMet specular meteor radars. It describes in detail a method for meteoroid orbit calculation. The EISCAT UHF system comprises three identical 32 m parabolic antennae: one high-power transmitter/receiver and two remote receivers. READ MORE
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3. Characterization of the BOLD signal in functional MRI
Abstract : In the last two decades, functional magnetic resonance imaging (fMRI) has become an important and widely used imaging technique for functional brain mapping. However, blood oxygen level dependent (BOLD) technique is quite insensitive and task invoked BOLD signal change at 3T is typically in the order of a few percent. READ MORE