Refine
Year of publication
- 2009 (185) (remove)
Document Type
- Article (119)
- Conference Proceeding (52)
- Part of a Book (7)
- Book (3)
- Doctoral Thesis (1)
- Patent (1)
- Talk (1)
- Working Paper (1)
Language
- English (185) (remove)
Keywords
- Papierkunst (3)
- Spacecraft (2)
- Stickstoffmonoxid (2)
- nitric oxide gas (2)
- Adsorption (1)
- Aktionskunst (1)
- Autofluoreszenzverfahren (1)
- Biophoton (1)
- Biosensor (1)
- Blitzschutz (1)
- Breitband Markt (1)
- Bundesnetzagentur (1)
- Business Engineering (1)
- Cross-Cultural Psychology (1)
- Cross-Cultural Training (1)
- Eisschicht (1)
- Electronic Commerce (1)
- Elektrodynamik (1)
- Erfahrungslernen (1)
- Erfahrungsorientiertes Lernen (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (73)
- IfB - Institut für Bioengineering (33)
- INB - Institut für Nano- und Biotechnologien (26)
- Fachbereich Elektrotechnik und Informationstechnik (25)
- Fachbereich Luft- und Raumfahrttechnik (18)
- Fachbereich Chemie und Biotechnologie (15)
- Fachbereich Energietechnik (13)
- Solar-Institut Jülich (12)
- Fachbereich Maschinenbau und Mechatronik (9)
- Fachbereich Bauingenieurwesen (6)
- Fachbereich Wirtschaftswissenschaften (6)
- Fachbereich Architektur (3)
- Fachbereich Gestaltung (3)
- Kommission für Forschung und Entwicklung (3)
- ECSM European Center for Sustainable Mobility (2)
- Freshman Institute (2)
- Sonstiges (2)
The recently proposed NASA and ESA missions to Saturn and Jupiter pose difficult tasks to mission designers because chemical propulsion scenarios are not capable of transferring heavy spacecraft into the outer solar system without the use of gravity assists. Thus our developed mission scenario based on the joint NASA/ESA Titan Saturn System Mission baselines solar electric propulsion to improve mission flexibility and transfer time. For the calculation of near-globally optimal low-thrust trajectories, we have used a method called Evolutionary Neurocontrol, which is implemented in the low-thrust trajectory optimization software InTrance. The studied solar electric propulsion scenario covers trajectory optimization of the interplanetary transfer including variations of the spacecraft's thrust level, the thrust unit's specific impulse and the solar power generator power level. Additionally developed software extensions enabled trajectory optimization with launcher-provided hyperbolic excess energy, a complex solar power generator model and a variable specific impulse ion engine model. For the investigated mission scenario, Evolutionary Neurocontrol yields good optimization results, which also hold valid for the more elaborate spacecraft models. Compared to Cassini/Huygens, the best found solutions have faster transfer times and a higher mission flexibility in general.
The readout of gamma detectors is considerably simplified when the event intensity is encoded as a pulse width (Pulse Width Modulation, PWM). Time-to-Digital-Converters (TDC) replace the conventional ADCs and multiple TDCs can be realized easily in one PLD chip (Programmable Logic Device). The output of a PWM stage is only one digital signal per channel which is well suited for transport so that further processing can be performed apart from the detector. This is particularly interesting for large systems with high channel density (e.g. high resolution scanners). In this work we present a circuit with a linear transfer function that requires a minimum of components by performing the PWM already in the preamp stage. This allows a very compact and also cost-efficient implementation of the front-end electronics.
Density Operator
(2009)
Operator
(2009)
Projection
(2009)
Self-Adjoint Operator
(2009)
Unitary Operator
(2009)
An immunochromatographic lateral flow dipstick assay for the fast detection of microcystin-LR was developed. Colloid gold particles with diameters of 40 nm were used as red-colored antibody labels for the visual detection of the antigen. The new dipstick sensor is capable of detecting down to 5 µg·l−1 (ppb; total inversion of the color signal) or 1 ppb (observation of color grading) of microcystin-LR. The course of the labeling reaction was observed via spectrometric wave shifts caused by the change of particle size during the binding of antibodies. Different stabilizing reagents showed that especially bovine serum albumin (BSA) and casein increase the assays sensitivity and the conjugate stability. Performance of the dipsticks was quantified by pattern processing of capture zone CCD images. Storage stability of dipsticks and conjugate suspensions over 115 days under different conditions were monitored. The ready-to-use dipsticks were successfully tested with microcystin-LR-spiked samples of outdoor drinking- and salt water and applied to the tissue of microcystin-fed mussels.