Search for dissertations about: "trace fossil"

Showing result 1 - 5 of 18 swedish dissertations containing the words trace fossil.

2. 1. The Evolutionary Significance of Cambrian Ecdysozoan Trace Fossils

   Author : Giannis Kesidis; Graham Budd; Liam Herringshaw; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Cambrian; trace fossil; Cruziana; Rusophycus; Treptichnus; Ecdysozoa;

   Abstract : The origin of most of the animal phyla is tied to the Cambrian explosion, a rapid diversification event that took place from about 540 million years ago. This diversification is coupled with a great number of concurrent metazoan body plan innovations such as the development of the coelom, antagonistic muscles and a through-gut. READ MORE

4. 2. Paleoceanographic implications of major and trace element distributions in fossil, marine sediments

   Author : Birger Schmitz; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : .... READ MORE

5. 3. Fate of Cu, Cr, As and some other trace elements during combustion of recovered waste fuels

   Author : Karin Lundholm; Anders Nordin; Britt-Marie Steenari; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; combustion; chemical equilibrium model calculations; trace elements; impregnated wood; waste; thermodynamic data; Cu; Cr; As; Other chemistry; Övrig kemi;

   Abstract : The increased use of biomass and recovered waste fuels in favor of fossil fuels for heat and power production is an important step towards a sustainable future. Combustion of waste fuels also offers several advantages over traditional landfilling, such as substantial volume reduction, detoxification of pathological wastes, and reduction of toxic leaches and greenhouse gas (methane) formation from landfills. READ MORE

6. 4. From Polysaccharides to Functional Materials for Trace Pharmaceutical Adsorption

   Author : Zhaoxuan Feng; Minna Hakkarainen; Rojas Orlando J; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Chitosan; cellulose; nanographene oxide; carbon spheres; hydrogel; microsphere; adsorbent; pharmaceutical; microwave; spray-drying; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Abstract : The transition to bioeconomy will reduce our dependency on fossil fuels as well as contribute to a more sustainable society. Within this framework, exploitation and development of renewable substitutes to petroleum-based products provides feasible roadmap for the material design. READ MORE

7. 5. Geochemical and sedimentary signatures of Phanerozoic events

   Author : Jane Wigforss-Lange; Berggrundsgeologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; geokemi; Sedimentology; Petrology; mineralogy; geochemistry; Petrologi; mineralogi; Carbon and oxygen isotopes; Jurassic-Cretaceous boundary; K-T boundary; Late Silurian; Events; Trace elements; Sedimentologi;

   Abstract : Geological and biological catastrophic events have occurred repeatedly in the Earth's history, leaving traces in the global stratigraphical record in the form of sedimentary features, geochemical anomalies and biotic turnovers. This thesis focuses on the sedimentological and geochemical signatures of several key events in the Phanerozoic stratigraphical record, and aims to interpret the different signals and the causal mechanisms behind each of these events. READ MORE