Reports

The compensation mechanism of silicon (Si) donors in GaAs are determined by scanning tunneling microscopy. With increasing Si concentration the Si donors are consecutively deactivated by Si acceptors, Si clusters, and Si donor-gallium vacancy complexes . [...]

For decision-making on settlement level, it is necessary to develop a reliable model for dose estimates which would take account of the whole range of local factors influencing the dose and enable the most reliable estimates based on only limited radiological data. For this aim a general concept of intemal dose assessment has been designed [...]

Die Verwendung von supraleitenden digitalen Einzelflußquantensc.haltungen (RSFQ) erlaubt hohe Taktraten bei sehr geringer Verlustleistung. Das Produkt aus Verlustleistung und Schaltzeit ist für diese Schaltungen im Vergleich zu Halbleiterschaltungen sehr klein. [...]

DC-Glow-Discharges in organic gases are widely used for the carbonization of surfaces. It is known, that these plasmas are suitable to constitute agglomers, which can be applied systematically for the sythesis of nanoparticles, but can be problematic with respect to the plasma induced thin film deposition. [...]

Lanthan-Strontium-Manganite perowskites are the most widespread materials in use for Solid Oxide Fuel Cell cathodes. The electrode reaction taking place, i.e. [...]

Plasma wall interaction is one of the key problems on the way to controlled nuclear fusion. The interaction of the plasma with the plasma facing components has a direct and significant influence on the penetration depth of the atoms [...]

The aim of this thesis is the investigation of chemical ozone loss processes in the Arctic winter stratosphere. Within the framework of the Second European Stratospheric Arctic and Midlatitude Experiment (SESAME) the Jülich Research Center in cooperation with the University of California at Irvine performed on 3 February 1995 balloon borne in-situ measurements in the Arctic polar vortex using a combined payload, which allowed for the simultaneous observation of long-lived trace gases, chlorine containing source gases, ozone and the halogen radicals CIO and BrO, which participate in catalytic cycles leading to ozone loss [...]

The siting of cumbersome infrastructur facilities$^{1}$ frequently encounters protests by local population. While the causes of these 'acceptance problems' have been widely investigated in connection with facility construction, there is a lack of knowledge about the acceptance of facilities which already exist [...]

The brown alga $\textit{Fucus vesiculosus}$ has been suggested as an indicator of heavy metal pollution in the North Sea coastal water. A wide range of trace elements and metals was determined in $\textit{Fucus vesiculosus}$ using multielement techniques [...]