Tools zur Entwicklung paralleler Programme

Für die optimale Nutzung von Parallelrechnern müssen bestehende Programme, die auf einem Prozessor laufen, erst so umgeschrieben werden, daß sie mehrere Prozessoren gleichzeitig beschäftigen können. Für die Fehlersuche in einem parallelen Programm reicht ein normaler Debugger nicht aus. Schließlich braucht man eine Möglichkeit, den Erfolg der Parallelisierung zu bewerten. Der Artikel gibt eine Zusammenstellung der am RUS verfügbaren Tools, die den Programmentwickler bei den verschiedenen Schritten des Entwicklungsprozesses für parallele Software unterstützen

Demonstration of supercomputing activities

During the inauguration of HLRS a broad variety of supercomputing-activities was demonstrated. As HLRS is involved in the development of Software for supercomputers as well as in their usage, the demos concentrated on the development of novel simulation-codes in the field of Computational Fluid Dynamics, the software-tools which are necessary for the developper and on the presentation of typical applications from engineering in the VR-lab

Nanoparticle functionalized laser patterned substrate: an innovative route towards low cost biomimetic platforms

Integration of nanotechnology and advanced manufacturing processes presents an attractive route to produce devices for adaptive biomedical device technologies. However, tailoring biological, physical, and chemical properties often leads to complex processing steps and therefore to high manufacturing cost impeding further scalability. Herein, a novel laser-based approach is introduced to manufacture low cost biocompatible polymer substrates functionalized with ultrapure nanoparticles. Laser direct writing was performed to create micron-sized patterns on 188 μm-thick cyclic olefin polymer (COP) substrates using a picosecond pulsed 1064 nm Nd:YAG laser. The Pulsed Laser Ablation in Liquids (PLAL) technique was exploited in this work to prepare colloidal solutions of ultrapure nanoparticles to impart bio-functionality onto laser patterned surfaces. Combining the laser patterns and their modification with PLAL-nanoparticles resulted in a functional and biocompatible substrate for biosensing applications. Our in vitro cell viability studies using a model cell line (human skin keratinocyte, HaCaT) suggest that these nanoparticles immobilized on the surfaces function as a biomimetic platform with the ability to interact with different biological entities (e.g. DNA, antibodies etc.)

Thermodynamic assessment of the Pd–Y binary system

The Pd–Y system was critically assessed using the CALPHAD technique. The solution phases (liquid, b.c.c., f.c.c. and h.c.p.) were modeled using the Redlich–Kister equation. The intermetallic compounds Pd3Y and PdY, which have homogeneity ranges, were treated as the formula (Pd,Y)0.75(Pd,Y)0.25 and (Pd,Y)0.5(Pd,Y)0.5 by a two-sublattice model with a mutual substitution of Pd and Y on both sublattices. The optimization was carried out in two steps. In the first treatment, Pd3Y and PdY are assumed to be stoichiometric compounds; in the second treatment they are treated by a sublattice model. The parameters obtained from the first treatment were used as starting values for the second treatment. The calculated phase diagram and the thermodynamic properties of the system are in satisfactory agreement with the experimental data