Sökning: "momentum"

Visar resultat 26 - 30 av 433 avhandlingar innehållade ordet momentum.

1. 26. Implementation and Analysis of Air-Sea Exchange Processes in Atmosphere and Ocean Modelling

   Författare :Björn Carlsson; Anna Rutgersson; Ann-Sofi Smedman; Öyvind Saetra; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sensible heat flux; Latent heat flux; Momentum flux; Wind stress; Marine boundary layer; Air–Sea interaction; Swell; Climate model; Ocean model; Roughness parameter; Drag coefficient; Wave breaking; Meteorology; Meteorologi;

   Sammanfattning : To understand and to predict the weather and climate, numerical models are important tools and it is crucial that the controlling processes are described correctly. Since 70% of the global surface is covered with water the description how the ocean and atmosphere communicates has a considerable impact. LÄS MER

3. 27. Essays on Credit Risk

   Författare :Caren Guo Nielsen; Nationalekonomiska institutionen; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Asset pricing; equity returns; size effect; value effect; momentum effect; credit risk effect; credit default swap; banks; asset risk; credit risk; portfolio choice; risk-based capital regulation; bank bailouts; moral hazard; distress risk; capital injections; TARP; CPP; market discipline; financial crisis;

   Sammanfattning : This dissertation covers the issues related to credit risk that stem from the recent financial crisis and that are concerned by investors, financial intermediaries, and governments. The results of the research have important implications for asset managers, such as using the information from the credit risk market to rebalance stock portfolios, and for policy makers in regulating or bailing out banks. LÄS MER

4. 28. Fluid Dynamics of the Transport Zone of Circulating Fluidized Beds - with Application to Boilers

   Författare :Wennan Zhang; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fluid dynamics; particle flux probe; momentum probe; circulating fluidized bed boilers; circulating fluidized beds; particle flow pattern; particle concentration probe; spectrum analysis;

   Sammanfattning : The particle suspension flow structure in circulating fluidized beds (CFB) was studied with emphasis on the layer of downflowing particles at the wall. The main experiments were carried out in the furnace of the 12 MWth CFB boiler of 1.7x1.7 m cross-section, and in a two-dimensional CFB cold bed of 0. LÄS MER

5. 29. High Pressure Jet Assistance in Steel Turning

   Författare :Patrik Dahlman; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Jet Assistance; Tool Life; Chip Control; Turning; Ultra High Pressure Cooling; Jet Momentum;

   Sammanfattning : Steel turning is one of the most common industrial processes today. It is a very old process, where a lot of improvements and optimisations have been done throughout history. But, the struggle for further cost reductions pushes the process development into new areas. LÄS MER

7. 30. Isomeric yield ratios in nuclear fission

   Författare :Zhihao Gao; Andreas Solders; Ali Al-Adili; Mattias Lantz; Stephan Pomp; Olivier Serot; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear fission; isomeric yield ratio; angular momentum; independent fission yield; ion guide; Applied Nuclear Physics; Tillämpad kärnfysik;

   Sammanfattning : Isomeric yield ratios (IYR), referring to the relative yield of the high spin states of a nucleus to the total yield of all observed states, is an observable of nuclear fission that has the potential to improve our understanding of the fission dynamics. Apart from that, systematic observations of IYRs can also contribute to other areas, such as the validation of fission models, modelling of the r-process in stellar nucleosynthesis, studies of the antineutrino mixing angle, the safety of present-day nuclear reactors, and the design of advanced reactor systems. LÄS MER