Search for dissertations about: "myr"

Showing result 1 - 5 of 34 swedish dissertations containing the word myr.

2. 1. Surface Energy Exchange and Hydrology of a Poor Sphagnum Mire

   Author : Erik Kellner; Harald Grip; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Sphagnum; Geovetenskap; myr; energibudget; ytresistans; vitmossa; hydrologiska modeller; TDR; Earth sciences; Geovetenskap; Hydrology; hydrologi;

   Abstract : Mires surface energy and water budgets govern the conditions for climatic, hydrological, ecological and carbon balance processes. The components of the water and surface energy budgets were quantified over two growing seasons for an open boreal mire. READ MORE

4. 2. Formic and Levulinic Acid from Cellulose via Heterogeneous Catalysis

   Author : Johan Ahlkvist; Jyri-Pekka Mikkola; Riitta Keiski; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Levulinic acid; formic acid; Amberlyst 70;

   Abstract : The chemical industry of today is under increased pressure to develop novel green materials, bio-fuels as well as sustainable chemicals for the chemical industry. Indeed, the endeavour is to move towards more eco-friendly cost efficient production processes and technologies and chemical transformation of renewables has a central role considering the future sustainable supply of chemicals and energy needed for societies. READ MORE

5. 3. Late Cenozoic Geoarchives from Lake Baikal, Siberia

   Author : Tomasz Sapota; Ala Aldahan; Göran Possnert; Ihsan Al-Aasm; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quaternary geology; Lake Baikal; Be-10 isotope; chronology; paleoclimate; tectonics; geomagnetic field; cosmic rays; Kvartärgeologi; Quaternary geology; Kvartärgeologi;

   Abstract : Three long sediment cores (BDP-98 – 600 m, BDP-96 – 200 m and BDP-93 – 100 m) drilled in Lake Baikal (Siberia) have been studied with the aims of establishing an absolute chronology and reconstructing paleoclimatic and paleoenvironmental changes in the region. The location of the lake at relatively high latitude and continental interior and a thick continuous sedimentary archive that developed in a rift system tectonic setting provide unique material for this investigation. READ MORE

6. 4. Climate and vegetation during the Miocene - evidence from Danish palynological assemblages

   Author : Linda Larsson; Berggrundsgeologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; palaeoenvironment; pollen; climate; Denmark; palynology; Miocene;

   Abstract : Several Danish exposures and one drill core spanning the upper Oligocene-upper Miocene interval of the Cenozoic (i.e., 24–5 Myr ago) were palynologically investigated. READ MORE

7. 5. Evolution of Lycopodiaceae (Lycopsida) : Relationships and Patterns of Diversification

   Author : Niklas Wikström; Anders Tehler; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; systematisk botanik; Systematic Botany;

   Abstract : A series of phylogenetic analyses using nucleotide sequence data resolves many aspects of the relationships in a group of land plants that until now have received comparatively little attention, the homosporous lycopsids or Lycopodiaceae. Although the group has evolved as an isolated lineage ever since the Late Devonian (more than 470 Myr ago), little is known about how modern species diversity relate to this ancient history. READ MORE