Universitaet Freiburg: Forschen, Wissen, Kontakte

SIGLEBibliothek Weltwirtschaft Kiel B 225892 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Forschen, Wissen, Kontakte

Available from Bibliothek des Instituts fuer Weltwirtschaft, ZBW, Duesternbrook Weg 120, D-24105 Kiel B 225892 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Entwicklung eines standardisierten dreiachsigen Strapdownsensors zur inertialen Messwerterfassung fuer zukuenftige Flugregelsysteme

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Entwicklung eines standardisierten dreichachsigen Strapdownsensors zur inertialen Messwerterfassung fuer zukuenftige Flugregelsysteme. T. 1 Kurzfassung

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Hochintegrierte Mikrowellenkomponenten fuer aktive Phased-Array-Antennen Schlussbericht

This study is embedded in the research program 'III-V-Electronics, Integrated Circuits for Highest Speed' (DFE), of the German Ministry of Education, Science, Research and Technology (BMBF). Herein, the international level of research and development in the III-V-semiconductor-area, could be reached again. Some subareas even showed international top-level-results. In future radio links, reconfigurable foot-print-areas are needed. This can be achieved by planar antennas with adjustable patterns. For this, two cost-effective microwave monolithic integrated circuits with high reliability were developed. To drive the antenna elements, a new amplitude-/phaseshifter MMIC was developed. A demonstrator has shown good function of the antenna. Linearity and thus power efficiency of solid state power amplifiers could be optimized by a new type of linearizer MMIC. In cooperation with the DFE-partner Siemens, a demonstrator combining this MMIC together with a driver and a power amplifier MMIC has proven the feasibility of the concept. All MMICs have been fabricated at the 'Institute for Applied Solid State Physcis of the Fraunhofer Gesellschaft' (FhG/IAF) with their GaAs/GaAlAs-HFET-technology. The study has been performed in close cooperation with this institute. (orig.)SIGLEAvailable from TIB Hannover: F96B1324+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Atoms in extreme virtual photon fields of fast, highly charged ions

Highly-charged ions at velocities close to the speed of light generate strong (I = 10"1"7 - 10"2"0 W/cm"2), ultra-short (t = 10"-"1"9 - 10"-"1"7 s) electromagnetic pulses when passing target atoms or molecules. Single and multiple ionization occurs and can be interpreted in terms of photoionization: at small field strength ionization is due to the absorption or the scattering of a single virtual photon whereas the incoherent, ''simultaneous'' absorption of ''many'' field quanta gives rise to multiple ionization in strong fields. In this paper analogies to photoionization are investigated by comparison of kinematically complete experimental data with results of various theoretical calculations for collisions of 100 MeV/u C"6"+, 1000 MeV/u U"9"2"+ and 3.6 MeV/u Au"5"3"+ on He, Ne and Ar targets. Dynamical multiple ionization mechanisms are identified as a function of the momentum transfer. Two-electron final states are found to sensitively depend on the correlated initial state, and the many-particle Coulomb continuum is investigated for triple ionization of neon in super-strong fields. (orig.)29 refs.SIGLEAvailable from TIB Hannover: RO 801(99-29) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman