Passive louver mechanism for small satellites

A miniaturisation trend in the satellite technology is clearly observable. The new generation of small satellites experiences very large thermal fluctuations, due to their high performance payload and low mass. Contemporary thermal control systems, applicable to small satellites, are mostly characterised by having either an insulative or a...

Design and development of active baseband loadpull system

Gedaechtniseffekte in der Turbulenz

NOTE: REPORT IN GERMAN, ONLY THE ABSTRACT IS IN ENGLISH Memory effects in the flow of fluids are known long since. One has to reckon with such effects when studying the flow of non-Newtonian fluids, for instance when they exhibit a visco-elastic behaviour. Certain phenomena in turbulence also seem to point towards a visco-elastic behaviour. If,...

Memory Effect in a Turbulent Boundary-Layer Flow Due to a Relatively Strong Axial Variation of the Mean-Velocity Gradient

Measurements have been made of the distributions of mean velocity, turbulence intensities and turbulence shear-stress in a turbulent boundary-layer downstream of a hemi-spherical cap attached onto the plane rigid wall. The eddy-viscosity, when computed in the classical way according to Boussinesq's concept from the lateral gradient of the mean...