Jan Herrmann

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Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information.(More)
II Using adaptive optics to compensate for atmospherically induced wavefront distortions requires a remote beacon. In astronomical imaging the beacon can be the object of interest or a nearby bright star. For a satellitethe beacon can be a retroreflector illuminated by a ground-based laser. Unfortunately, dim stars don't always have bright neighbors, and we(More)
ACKNOWLEDGEMENTS First of all, i would like to thank my advisor Prof. Laurence J. Jacobs for all his support during my stay in Atlanta. He helped me in desperate situations and motivated me whenever it was necessary. Because of his financial and organizational commitment , i could present the results of this thesis at the Quantitative Nondestructive(More)
Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information.(More)
A new certified reference material for quality control of nanoparticle size analysis methods has been developed and produced by the Institute for Reference Materials and Measurements of the Euro-pean Commission's Joint Research Centre. The material , ERM-FD102, consists of an aqueous suspension of a mixture of silica nanoparticle populations of distinct(More)
Today more than 200 million people are suffering from malnutrition in Africa, a major contributing factor to this is that Africa is the continent, by a large margin, that gets least yield per cultivated hectare. The relatively poor yield is not because Africa has no cultivable land but because of the prevailing agricultural practices. Orongo is a village in(More)
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