Der gemeinsame Einfluß mehrerer Legierungselemente auf die Sauerstoffaktivität von Metallschmelzen

Elektrochemische Bestimmung der Sauerstoffaktivität mit der Festelektrolytzelle Luft || ZrO₂(CaO) || Metallschmelze in chrom- und vanadinhaltigen Eisen- oder Kobaltschmelzen mit 5 bis 18% Cr und 0,3 bis 1,5% V sowie 3 bis 20% Cr und 0,2 bis 4% V bei 1600 °C. Ermittlung der Wirkungsparameter e^Cr_O und e^V_O. Nachweis der Ungültigkeit der Additivitätsregel für die Wirkungsparameter in diesen Mehrstofflösungen.     

FI3D: direct-touch interaction for the exploration of 3D scientific visualization spaces

We present the design and evaluation of FI3D, a direct-touch data exploration technique for 3D visualization spaces. The exploration of three-dimensional data is core to many tasks and domains involving scientific visualizations. Thus, effective data navigation techniques are essential to enable comprehension, understanding, and analysis of the information space. While evidence exists that touch can provide higher-bandwidth input, somesthetic information that is valuable when interacting with virtual worlds, and awareness when working in collaboration, scientific data exploration in 3D poses unique challenges to the development of effective data manipulations. We present a technique that provides touch interaction with 3D scientific data spaces in 7 DOF. This interaction does not require the presence of dedicated objects to constrain the mapping, a design decision important for many scientific datasets such as particle simulations in astronomy or physics. We report on an evaluation that compares the technique to conventional mouse-based interaction. Our results show that touch interaction is competitive in interaction speed for translation and integrated interaction, is easy to learn and use, and is preferred for exploration and wayfinding tasks. To further explore the applicability of our basic technique for other types of scientific visualizations we present a second case study, adjusting the interaction to the illustrative visualization of fiber tracts of the brain and the manipulation of cutting planes in this context.     

DTI in Context: Illustrating Brain Fiber Tracts In Situ

We present an interactive illustrative visualization method inspired by traditional pen‐and‐ink illustration styles. Specifically, we explore how to provide context around DTI fiber tracts in the form of surfaces of the brain, the skull, or other objects such as tumors. These contextual surfaces are derived from either segmentation data or generated using interactive iso‐surface extraction and are rendered with a flexible, slice‐based hatching technique, controlled with ambient occlusion. This technique allows us to produce a consistent and frame‐coherent appearance with precise control over the lines. In addition, we provide context through cutting planes onto which we render gray matter with stippling. Together, our methods not only facilitate the interactive exploration and illustration of brain fibers within their anatomical context but also allow us to produce high‐quality images for print reproduction. We provide evidence for the success of our approach with an informal evaluation with domain experts.     

The photolysis of metal carbonyl polymers in solutions and polymer films

The photochemical behaviour of VIB group metal carbonyl complexes of polyacrylonitrile (PAN) and iron tricarbonyl complexes of poly(styrene-butadiene) (SBS) block-copolymer have been investigated in this study in dimethylsulphoxide (DMSO) and/or in N,N-dimethylformamide (DMFA) solutions as well as in polymer films. In the case of metal carbonyl complexes with polyacrylonitrile the primary photochemical reactions have been shown to be the dissociation of pentaand tetracarbonyl complexes which result in the removal of one nitrile ligand followed by an exchange between the nitrile groups and the solvent molecules. The removal of CO has been shown to be the most probable photochemical reaction in films of these polymers. In the case of the iron tricarbonyl complex of SBS, laser photolysis leads to the fast isomerization of the complex followed by the replacement of the olefin groups of the polymer by CO.     

An intercomparison study of the determination of sulfite in tropical shrimps by the West European Fish Technologists’ Association (WEFTA)

Eight WEFTA laboratories participated in two series of intercomparison exercises on sulfite determination in tropical shrimps. Samples of tropical shrimps were spiked with sodium metabisulfite (Na₂S₂O₅) and hydroxymethylsulfonate (HMS) at a level of 25–90?mg SO₂/kg. Most of the laboratories determined the sulfite content with (modified) methods of Monier-Williams or De Vries et al. The overall mean recovery of sulfite was rather low (47–60%), which may be attributed to an irreversible reaction of sulfite with the tropical shrimps. The repeatability of the methods within the participating laboratories was good. However, reproducibility among the laboratries was poor. It has been shown that the sulfite content in tropical shrimps spiked with Na₂S₂O₅ decreased during storage at ?20°C and at +4°C. Hydroxymethyl- sulfonate was stable during storage.     

Die Sauerstoffpermeabilität von Festelektrolyten und ihr Einfluß auf die elektrochemische Aktivitätsbestimmung des Sauerstoffs in Gasen und Metallschmelzen

Messung der Sauerstoffpermeabilität in den Festelektrolyten stabilisiertes Zirkonoxid, Mullit und Aluminiumoxid. Angaben über das Auftreten von Diffusionsschichten an den Phasengrenzen. Deutung der Permeabilität über den Leitungsmechanismus in den Festelektrolyten. Einfluß der Diffusionsschichten auf die elektrochemische Bestimmung der Sauerstoffaktivität.