Nonlinear projective filtering in a data stream

We introduce a modified algorithm to perform nonlinear filtering of a time series by locally linear phase space projections. Unlike previous implementations, the algorithm can be used not only for a posteriori processing but includes the possibility to perform real time filtering in a data stream. The data base that represents the phase space structure generated by the data is updated dynamically. This also allows filtering of non-stationary signals and dynamic parameter adjustment. We discuss exemplary applications, including the real time extraction of the fetal electrocardiogram from abdominal recordings.Comment: 8 page

Scaling properties of ballistic nano-transistors

Recently, we have suggested a scale-invariant model for a nano-transistor. In agreement with experiments a close-to-linear thresh-old trace was found in the calculated ID - VD-traces separating the regimes of classically allowed transport and tunneling transport. In this conference contribution, the relevant physical quantities in our model and its range of applicability are discussed in more detail. Extending the temperature range of our studies it is shown that a close-to-linear thresh-old trace results at room temperatures as well. In qualitative agreement with the experiments the ID - VG-traces for small drain voltages show thermally activated transport below the threshold gate voltage. In contrast, at large drain voltages the gate-voltage dependence is weaker. As can be expected in our relatively simple model, the theoretical drain current is larger than the experimental one by a little less than a decade

"Kunden, ganz normale Kunden": Zur Wirklichkeit zwischen Gebenden und Nehmenden im karitativen Handlungszusammenhang

Ausgehend von Beobachtungen in einem Sozialkaufhaus und bei einem Tafel e.V. setzt sich der Beitrag mit solchen "kritischen" Zugängen zur karitativen Wirklichkeit auseinander, die diese im Nachweis mangelhafter Sozialität als eine Unwirklichkeit disqualifizieren.Based on observations made in a charity shop and at a food bank, the article deals with "critical" approaches which downgrade these charitable domains to illusory worlds lacking real sociality

»Kunden, ganz normale Kunden«. Zur Wirklichkeit zwischen Gebenden und Nehmenden im karitativen Handlungszusammenhang

Ausgehend von Beobachtungen in einem Sozialkaufhaus und bei einem Tafel e. V. setzt sich der Beitrag mit solchen ›kritischen‹ Zugängen zur karitativen Wirklichkeit auseinander, die diese im Nachweis mangelhafter Sozialität als eine Unwirklichkeit disqualifizieren. Based on observations made in a charity shop and at a food bank, the article deals with ›critical‹ approaches which downgrade these charitable domains to illusory worlds lacking real sociality.

»Kunden, ganz normale Kunden«. Zur Wirklichkeit zwischen Gebenden und Nehmenden im karitativen Handlungszusammenhang

Ausgehend von Beobachtungen in einem Sozialkaufhaus und bei einem Tafel e. V. setzt sich der Beitrag mit solchen ›kritischen‹ Zugängen zur karitativen Wirklichkeit auseinander, die diese im Nachweis mangelhafter Sozialität als eine Unwirklichkeit disqualifizieren. Based on observations made in a charity shop and at a food bank, the article deals with ›critical‹ approaches which downgrade these charitable domains to illusory worlds lacking real sociality.

Real-time ray tracing of volumetric data

As hardware development advances, ray tracing becomes more and more viable for real-time. Even ray tracing for volumetric data is possible with interactive frame rates. The molecular visualization program VMD is about to be extended to use volumetric ray tracing to enhance the image quality. In this thesis I show the implementation of a volumetric ray tracer that achieves interactive frame rates. The NVIDIA OptiX framework is used as the foundation for the ray tracing. OptiX is a programmable ray tracing framework designed to help developers to build ray tracing applications. Volumetric ray tracing is implemented using direct volume rendering via ray marching. The problems of intersecting geometry and translucency are solved by casting further rays and good image quality is achieved using a local approximation for ambient occlusion. The results show that interactive frame rates are possible for standard desktop PCs. But with activated ambient occlusion only offline rendering can be used.Mit der fortschreitenden Hardware-Entwicklung wird es immer praktikable Raytracing in Echtzeit durchzuführen. Auch für die volumetrische Daten ist es möglich, interaktiven Bildraten zu erzeugen. Das molekulare Visualisierungsprogramm VMD soll erweitert werden volumetrisches Raytracing zu verwenden, um die Bildqualität zu verbessern. In dieser Arbeit zeige Ich die Implementierung eines volumetrischen Raytracer, welcher interaktive Bildraten erreicht. Das NVIDIA OptiX Framework wird als Grundlage für das Raytracing eingesetzt. OptiX ist ein programmierbarsr Raytracing Framework, welches um Entwicklern hilft, Raytracing-Anwendungen zu erstellen. Volumetrisches Raytracing wurde über das direkte Volumen Rendering Verfahren namens Ray Marching implementiert. Die Probleme von überschneudender Geometrie und Transparanez wurden durch das Erzeugen weiterer Strahlen gelöst und eine gute Bildqualität wurde durch eine lokale Näherung für Ambient Occlusion erreicht. Die Ergebnisse zeigen, dass für Standard-Desktop-PCs interaktive Bildraten möglich sind. Mit aktiviertem Ambient Occlusion kann jedoch nur offline Rendering verwendet werden

Beobachtungen zur Parasitierung von Radnetzspinnen (Araneidae) durch Polysphincta rufipes (Hymenoptera: Ichneumonidae)

We found the ichneumonid Polysphincta rufipes Gravenhorst, 1829 (tribus Polysphinctini) to be a koinobiont parasitoid of two species of araneid orb-weavers, Larinioides sclopetarius and Zygiella x-notata, in Central Europe. Some notes on the biology of P. rufipes are given, based on observations both in the field and in the laboratory. The wasps directly attack non-adult spiders sitting in the hubs of their webs. Parasitized spiders could be found from, at least, August to early December. The duration of the development of the wasp larvae, including the pupal stage, is about two months. It seems conceivable that at the end of the larval stage the larva somehow manipulates its host spider; i.e. the spider is forced to enter its retreat – a safe place where the larva can kill the host, complete its development and spin a cocoon for pupation (pupa libera)

Fundamental absorption edges in heteroepitaxial YBiO3 thin films

The dielectric function of heteroepitaxial YBiO3 grown on a-Al2O3 single crystals via pulsed laser deposition is determined in the spectral range from 0.03 eV to 4.5 eV by a simultaneous modeling of the spectroscopic ellipsometry and optical transmission data of YBiO3 films of different thicknesses. The (111)-oriented YBiO3 films are nominally unstrained and crystallize in a defective fluorite-type structure with a Fm3⎯⎯m space group. From the calculated absorption spectrum, a direct electronic bandgap energy of 3.6(1) eV and the signature of an indirect electronic transition around 0.5 eV are obtained. These values provide necessary experimental feedback to previous conflicting electronic band structure calculations predicting either a topologically trivial or a non-trivial insulating ground state in YBiO3