Refine
Year of publication
- 2002 (130) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (46)
- Fachbereich Energietechnik (21)
- Fachbereich Elektrotechnik und Informationstechnik (20)
- INB - Institut für Nano- und Biotechnologien (16)
- Fachbereich Chemie und Biotechnologie (13)
- IfB - Institut für Bioengineering (10)
- Fachbereich Luft- und Raumfahrttechnik (8)
- Solar-Institut Jülich (8)
- Fachbereich Wirtschaftswissenschaften (7)
- Fachbereich Gestaltung (2)
Language
- English (130) (remove)
Document Type
- Article (92)
- Conference Proceeding (25)
- Book (12)
- Patent (1)
Keywords
- Blitzschutz (2)
- Biomedizinische Technik (1)
- Bruchmechanik (1)
- CAD (1)
- CAD ; (1)
- Direkter Blitzschlag (1)
- Einspielen <Werkstoff> (1)
- Elektromagnetischer Schutzschild (1)
- Erneuerbare Energien (1)
- Gasturbine (1)
- Hybridsystem (1)
- Induzierte Spannungen (1)
- Lightning (1)
- Lightning protection (1)
- Lightning protection system (1)
- Magnetische Felder (1)
- Micro turbine (1)
- Mikrogasturbine (1)
- Photovoltaikanlage (1)
- Ratcheting (1)
- Risikoabwägung (1)
- Shakedown (1)
- Stahlbetonkonstruktion (1)
- Windenergieanlage (1)
- civil engineering (1)
- electromagnetic shielding (1)
- hybrid system (1)
- induced voltage (1)
- linear kinematic hardening (1)
- magnetic field (1)
- material shakedown (1)
- nonlinear kinematic hardening (1)
- photovoltaic system (1)
- protection measures (1)
- ratchetting (1)
- reinforced concrete (1)
- renewable energy (1)
- risk assessment (1)
- shakedown (1)
- wind turbine (1)
Welcome to the training: Actionist Respoke interaktiv by Michael Jonoschek und Rüdiger Schlömer
(2002)
Structural design analyses are conducted with the aim of verifying the exclusion of ratcheting. To this end it is important to make a clear distinction between the shakedown range and the ratcheting range. In cyclic plasticity more sophisticated hardening models have been suggested in order to model the strain evolution observed in ratcheting experiments. The hardening models used in shakedown analysis are comparatively simple. It is shown that shakedown analysis can make quite stable predictions of admissible load ranges despite the simplicity of the underlying hardening models. A linear and a nonlinear kinematic hardening model of two-surface plasticity are compared in material shakedown analysis. Both give identical or similar shakedown ranges. Structural shakedown analyses show that the loading may have a more pronounced effect than the hardening model.
The hybrid K+/Ca2+ sensor based on laser scanned silicon transducer for multi-component analysis
(2002)
The optimization of light output and energy resolution of scintillators is of special interest for the development of high resolution and high sensitivity PET. The aim of this work is to obtain statistically reliable results concerning optimal surface treatment of scintillation crystals and the selection of reflector material. For this purpose, raw, mechanically polished and etched LSO crystals (size 2×2×10 mm3) were combined with various reflector materials (Teflon tape, Teflon matrix, BaSO4) and exposed to a 22Na source. In order to ensure the statistical reliability of the results, groups of 10 LSO crystals each were measured for all combinations of surface treatment and reflector material. Using no reflector material the light output increased up to 551±35% by mechanical polishing the surface compared to 100±5% for raw crystals. Etching the surface increased the light output to 441±29%. The untreated crystals had an energy resolution of 24.6±4.0%. By mechanical polishing the surface it was possible to achieve an energy resolution of 13.2±0.8%, by etching of 14.8±0.7%. In combination with BaSO4 as reflector material the maximum increase of light output has been established to 932±57% for mechanically polished and 895±61% for etched crystals. The combination with BaSO4 also caused the best improvement of the energy resolution up to 11.6±0.2% for mechanically polished and 12.2±0.3% for etched crystals. Relating to the light output there was no significant statistical difference between the two surface treatments in combination with BaSO4. In contrast to this, the statistical results of the energy resolution have shown the combination of mechanical polishing and BaSO4 as the optimum.
We are developing an X-ray computed tomography (CT) system which will be combined with a high resolution animal PET system. This permits acquisition of both molecular and anatomical images in a single machine. In particular the CT will also be utilized for the quantification of the animal PET data by providing accurate data for attenuation correction. A first prototype has been built using a commercially available plane silicon diode detector. A cone-beam reconstruction provides the images using the Feldkamp algorithm. First measurements with this system have been performed on a mouse. It could be shown that the CT setup fulfils all demands for a high quality image of the skeleton of the mouse. It is also suited for soft tissue measurements. To improve contrast and resolution and to acquire the X-ray energy further development of the system, especially the use of semiconductor detectors and iterative reconstruction algorithms are planned.
Solar sailcraft provide a wide range of opportunities for high-energy low-cost missions. To date, most mission studies require a rather demanding performance that will not be realized by solar sailcraft of the first generation.
However, even with solar sailcraft of moderate performance, scientifically relevant missions are feasible. This is demonstrated with a Near Earth Asteroid sample return mission and various planetary rendezvous missions.