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Visar resultat 1 - 5 av 1053 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Biocarbon for fossil coal replacement

   Författare :Aekjuthon Phounglamcheik; Kentaro Umeki; Mašek Ondřej; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biomass pyrolysis; charcoal; bio-oil recycling; CO2 utilization; reactivity; rotary drum; Energiteknik; Energy Engineering;

   Sammanfattning : This research aims to provide a full view of knowledge in charcoal production for fossil coal replacement. Charcoal from biomass is a promising material to replace fossil coal, which is using as heating source or reactant in the industrial sector. LÄS MER

3. 2. From Fossil To Fact : The Denisova Discovery as Science in Action

   Författare :Mattis Karlsson; Eva Hemmungs Wirtén; Martin Fredriksson; Andreas Nyblom; Staffan Bergwik; Linköpings universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; HUMANIORA; HUMANITIES; Actor network theory; aDNA; ANT; Denisovan; Denisova human; Denisova hominin; DNA; Knowledge; Bruno Latour; Science; Science in action; STS; Wikipedia;

   Sammanfattning : From Fossil to Fact: The Denisova Discovery as Science in Action is a study of the (actor) networked relations that make and shape science through the case of the discovery of the Denisova human.In 2010, Nature published the article “The complete mitochondrial DNA genome of an unknown hominin from southern Siberia”, the article revealed the results of mtDNA sequencing of a fossilised finger bone excavated from the Denisova Cave in Siberia, showing that the fossil belonged to an individual of a previously unknown type of humans, the Denisovans. LÄS MER

4. 3. Fossil Free or Not - That is the Question

   Författare :Torbjörn Skytt; Bengt-Gunnar Jonsson; Monica Odlare; Markku Rummukainen; Mittuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fossil free; Carbon balance; Carbon flow; Energy flow; Climate mitigation; Governing climate change; Forest carbon;

   Sammanfattning : This is an evaluation of Jämtland County’s ability to achieve its climate targets to reduce greenhouse gas (GHG) emissions with 10% annually, and to become fossil fuel free 2030. There is a risk that the target to become fossil fuel-free, relying primarily on outtake of forest biomass, contradicts with the target in the UN Paris Agreement to keep the global temperature increase below 1. LÄS MER

5. 4. Non-geological hydrogen storage for fossil-free steelmaking

   Författare :Joakim Andersson; Stefan Grönkvist; Simon Harvey; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrogen storage; fossil-free; steelmaking; industrial decarbonization; hydrogen direct reduction; Chemical Engineering; Kemiteknik;

   Sammanfattning : In the last half-century, global steel use has increased more than threefold and further growth is expected, particularly in developing economies. However, steelmaking is currently responsible for 7% of the global net carbon dioxide (CO2) emissions, and any substantial further optimization of existing processes that utilize fossil fuels for iron ore reduction is infeasible. LÄS MER

7. 5. Dating Divergence Times in Phylogenies

   Författare :Cajsa Lisa Anderson; Kåre Bremer; Katleen M. Pryer; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; systematic biology; divergence time; nonprametric rate smoothing; Bayesian; multidivtime; eudicots; Neoaves; monocots; dating; molecular clock; relaxed clock; age constraint; fossil; calibration; PATHd8; penalized likelihood; Biology; Biologi;

   Sammanfattning : This thesis concerns different aspects of dating divergence times in phylogenetic trees, using molecular data and multiple fossil age constraints.Datings of phylogenetically basal eudicots, monocots and modern birds (Neoaves) are presented. Large phylograms and multiple fossil constraints were used in all these studies. LÄS MER