Sökning: "centroid"

Visar resultat 1 - 5 av 24 avhandlingar innehållade ordet centroid.

1. 1. Design and implementation of a programmable, wideband sonar for sediment mapping

   Författare :Peter Jonsson; Teknisk geologi; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; centroid; programmable sonar; sediment mapping; underwater acoustics; hydroacoustics; echosounder;

   Sammanfattning : To be able to explore different signal types and processing techniques, apt for sediment mapping, programmable, fully digital profiling systems has been built and tested. The systema are designed to be deployed also at small water depths from small boats, without special handling equipment. LÄS MER

3. 2. Description of spatial and temporal distributions of epiphytic lichens

   Författare :Håkan Lättman; Per Milberg; Bengt Gunnar Jonsson; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; centroid; continuity; lichen; movement; range shift; direction; dispersal; ecological continuity; establishment; global change; global warming; habitat availability; håkan lättman; Biology; Biologi;

   Sammanfattning : Lichens are, in most cases, sensitive to anthropogenic factors such as air pollution, global warming, forestry and fragmentation. Two studies are included in this thesis. The first is an evaluation of the importance of old oak for the rare epiphytic lichen Cliostomum corrugatum (Ach.) Fr. LÄS MER

4. 3. Childhood Obesity and Islet Function

   Författare :Johan Staaf; Peter Bergsten; Anders Forslund; Hindrik Mulder; Uppsala universitet; []
   Nyckelord :type 2 diabetes mellitus; Uppsala Longitudinal Study of Childhood Obesity; palmitate; glucose-stimulated insulin secretion; hyperinsulinemia; hyperglucagonemia; GLP-1; glicentin; magnetic resonance imaging; metabolic syndrome; oral glucose tolerance test; centroid; Pediatrik; Pediatrics;

   Sammanfattning : The prevalence of childhood obesity and Type 2 Diabetes Mellitus (T2DM) has increased during recent decades. T2DM is accompanied with functional changes in the islets of Langerhans, which can be identified early in the pathogenesis. LÄS MER

5. 4. Retrieval of Ocean Surface Currents and Winds Using Satellite SAR backscatter and Doppler frequency shift

   Författare :Anis Elyouncha; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Doppler centroid analysis; Bayesian inversion; ocean surface winds; Ocean surface currents; synthetic aperture radar; along-track InSAR;

   Sammanfattning : Ocean surface winds and currents play an important role for weather, climate, marine life, ship navigation, oil spill drift and search and rescue. In-situ observations of the ocean are sparse and costly. Satellites provide a useful complement to these observations. LÄS MER

7. 5. Studies on spatial and temporal distributions of epiphytic lichens

   Författare :Håkan Lättman; Per Milberg; Jan-Eric Mattsson; Tord Snäll; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Lichens are an important group of organisms in terms of environmental issues, conservation biology and biodiversity, principally due to their sensitivity to changes in their environment. Therefore it is important that we develop our understanding of the factors that affect lichen distribution. LÄS MER