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In our work, which is still in progress, we examine the visibility potentials of RFID technology within the context of Supply Chain Management (SCM). This analysis is conducted systematically by matching identified SCM visibility requirements and general RFID visibility potentials. Building on a four-step approach, we show how visibility in supply chains can be improved on the basis of RFID-generated...
The influence of an erbium-doped fiber amplifier on the timing stability of an optical pulse train was characterized with balanced optical cross-correlation. Under optimized conditions, an added timing jitter of 0.5 fs was achieved.
After the repercussions of the introduction of RoHS and WEEE have slowed down, and the first revisions are on the way, the focus in environmental legislation for electronics is shifting in two major directions: the internationalization of RoHS- and WEEE-like requirements and potential new requirements especially from EuP and REACh directives. After giving an overview of the status of substance restriction...
High power pump modules are used for industrial as well as telecom applications such as for fiber lasers and cladding pumped erbium doped fiber amplifiers (EDFA) [Lichtenstein, N., et al., 2004]. Key element of a pump module is a single emitter laser diode, which normally has an aperture of around 90 mum, in order to provide best coupling into an optical multi-mode fiber with a 105 mum core diameter...
Transmission of a strongly focused light beam through a nanoscopic aperture differs for radial and azimuthal polarization and for holes and coaxial structures. Experimental results are compared with FDTD-calculations showing the relevance of surface plasmons.
To make the best possible use of the higher luminosity provided by the upgraded HERA collider, the H1 collaboration has built the Fast Track Trigger (FTT). It is integrated in the first three levels (L1-L3) of the H1 trigger scheme and provides enhanced selectivity for events with charged particles. The FTT allows the reconstruction of tracks in the central drift chambers down to 100 MeV. Within the...
Recently, systems providing access to extremely large data collections, managed in a distributed manner, gain emerging attention. A promising approach to implement the physical layer of such systems are structured overlays based on the peer-to-peer paradigm. On the level of query expressiveness. ranking queries like skyline queries are predestinated for providing a fast but concise overview of the...
We have developed rectangular patch antennas with single-ended and balanced feed ports, respectively, for use in high data-rate millimetre wave transmission systems. The antennas were designed for the unlicensed ISM-band at 60 GHz, and fabricated in ceramic multilayer technology employing high dielectric-constant materials. For the experimental characterisation of the balanced layout with a coplanar...
The wind turbine market is growing rapidly, and there has also been a trend toward ever increasing turbine rating. Most turbines to date has used geared high speed generators, but a history of gearbox reliability problems have turned many turbine manufacturers towards direct drive generators, which are very low speed, high torque, and therefore very large. Superconducting machines offer the possibility...
Collaborative business items - or CoBIs - are an approach to build pervasive computing systems in order to support business processes with mobile assets and items. CoBIs enable the delegation of tasks originally located in stationary large back-end systems down to mobile assets and items. For instance, these tasks include the direct, i.e. item-centric, monitoring and detection of hazardous situations...
A fully integrated mass spectrometer on one chip with a time of flight (TOF) mass filter is presented. This miniaturized mass spectrometer (MMS) is predestinated for mobile measurements, portable applications as well as continuous process monitoring. The MMS uses a microwave plasma electron source providing a high density electron beam for electron impact ionization. The integrated ion optics extracts...
A MEMS vapor-jet pump for vacuum generation in miniaturized analytical systems, e.g. micro mass-spectrometers, is presented. A high velocity nitrogen- or water-vapor-jet is used for vacuum generation. Starting from atmospheric pressure, a high throughput of more than 50 ml/min and an ultimate pressure of 495 mbar were obtained with this new type of micropump. An approach for the full integration of...
Low temperature co-fired ceramics (LTCC) is being widely used for microwave circuits. The BMBF funded R&D-project KERAMIS focuses on larger implementation of functionality in LTCC substrates to allow designs with "standard" MMICs. Target applications are circuits for multimedia satellite communications. In order to add more functionality in LTCC, current patterning limits of line width...
This paper deals with the investigation of mechanisms leading to a degradation of the electrical properties of titanium nitride - aluminum oxide - titanium nitride capacitors at high temperatures. Several degradation mechanisms could be identified by thorough electrical and physical characterization. The findings will serve as a future guide to build thermally stable MIM capacitors
The informational bookkeeping of pumps is of particular interest for a wide range of applications in operative process control engineering. The integration of pump information in process control, in plant asset management and energy management applications, generally opens a large potential for improved maintenance as well as for process and plant optimisation. The important role of pumps in industry...
Flexible production tasks in modern process plants, changes of production strategies, the ongoing development of field devices, changing applications of the process control and operation management level highly require an optimally adaptive field device functionality. A flexible device functionality is especially motivated by its extension with innovative device and process diagnostics, considering...
Adult-derived stem cells have recently been found to respond in vivo to inductive signals from the microenvironment and to differentiate into a phenotype that is characteristic of cells in that microenvironment. We examined the differentiation potential of an adult liver stem cell line (WBF344) in a cardiac microenvironment in vitro. WBF344 cells were established from a single cloned non-parenchymal...
In this paper we introduce a generalised resource model for parallel instruction scheduling. This model is used to formulate the resource constraints for periodic loop schedules, which are then rewritten employing an efficient flow graph model. The generalisation leads to a significant simplification and acceleration of the painful process of modelling new resource classes, and of incorporating specific...
Long-term security is achieved by protocols which use computational assumptions only during the execution of the protocol and become information theoretically secure afterwards. Coin flipping protocols and zero knowledge arguments are examples for protocols achieving long-term security. In this work we consider this regime between computational security and information theoretic security. A security...
The H1 experiment at the electron-proton collider HERA has built a new fast track trigger to increase the selectivity for exclusive final states, especially those with heavy quarks, and to cope with the higher background rates after the HERA luminosity upgrade. Hits measured in the central jet chamber of H1 are combined to track segments by performing 5 middot 1012 mask comparisons per second using...
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