Sökning: "momentum exchange."

Visar resultat 11 - 15 av 47 avhandlingar innehållade orden momentum exchange..

1. 11. Fluxes and Mixing Processes in the Marine Atmospheric Boundary Layer

   Författare :Erik Olof Nilsson; Anna Rutgersson; Harm Jonker; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Waves; Growing sea; Swell; Marine boundary layer; Air-sea interaction; Mixing; Momentum flux; Wind stress; Flux attenuation; Sensor separation; Large eddy simulation; Multiresolution analysis; Coupling; Wave model; Climate model; Wave age; Meteorology; Meteorologi;

   Sammanfattning : Atmospheric models are strongly dependent on the turbulent exchange of momentum, sensible heat and moisture (latent heat) at the surface. Oceans cover about 70% of the Earth’s surface and understanding the processes that control air-sea exchange is of great importance in order to predict weather and climate. LÄS MER

3. 12. Nanospintronics with Molecular Magnets - Tunneling and Spin-Electric Coupling

   Författare :Javier Francisco Nossa Márquez; Fasta tillståndets fysik; []
   Nyckelord :Molecular magnets; spin exchange; spin-orbit interaction; magnetic anisotropy; spin frustration; spin chirality; spin-electric control; quantum transport; Coulomb blockade; density functional theory; quantum master equation.;

   Sammanfattning : This dissertation investigates theoretically electric control of the magnetic properties of molecular magnets. Two classes of magnetic molecules are considered. The first class consists of molecules that are spin frustrated. LÄS MER

4. 13. Turbocharger Compressor Noise: a Numerical Study

   Författare :Asuka Gabriele Pietroniro; Mihai Mihaescu; Mats Åbom; Magnus Knutsson; Chenyang Weng; Phillip Joseph; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk mekanik; Engineering Mechanics;

   Sammanfattning : Road transport is the primary means of conveyance of passengers and freight in the EU, accounting for 71% and 52% of the totals, respectively. At low speeds and in situations with frequent start-stops and accelerations, i.e. LÄS MER

5. 14. Modeling and Simulations of Multiphysics Phenomena ad Performance in Proton Exchange Membrane Fuel Cells

   Författare :Shian Li; Värmeöverföring; []
   Nyckelord :PEMFC; agglomerate model; interdigitated flow field; GDL deformation; flow field design; metal foam; cooling plate; non-uniform channel; wavy channel; modeling and simulation.;

   Sammanfattning : Proton exchange membrane fuel cells (PEMFCs) are considered as the mostpromising alternative power sources with a wide variety of applications owing to their attractive advantages compared to other conventional power sources. During the past decades, the cell performance has been gradually improved. LÄS MER

7. 15. Turbulence Structure and Fluxes over Sea

   Författare :Erik Nilsson; Anna Rutgersson; Mark Kelly; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Boundary-layer; Air-sea interaction; turbulent fluxes; Meteorology; Meteorologi;

   Sammanfattning : Understanding the processes that control air-sea exchange of momentum, sensible heat and moisture (latent heat) is of great importance for atmospheric and oceanic modelling. In the atmosphere, for instance, cyclone intensity and track depends on these processes. LÄS MER