CRASH! Mathematik und kombinatorisches Chaos prallen aufeinander

Ohne Zusammenfassung     

Quantitative pressure and strain field analysis of helium precipitates in silicon

The structural properties of overpressurised helium precipitates formed by low dose ion implantation and subsequent annealing of silicon are investigated by quantitative transmission electron microscopy techniques. These precipitates, which show pronounced platelet geometry, are analysed with respect to their geometry, crystallographic orientation and their particular gas pressure values. The dependence of the measured platelet pressure versus the radius is discussed in terms of a Griffith crack. Experimental results on the shape and the crystallographic orientation of the platelets are discussed in the framework of anisotropic elastic properties and surface energies of silicon. The ability of the precipitates to punch-out dislocation loops is discussed in terms of associated threshold shear stress values and evaluated with regard to the defect size dependency.     

OpenSocial

OpenSocial definiert eine Menge von Programmierschnittstellen für Anwendungen von Drittanbietern im Kontext sozialer Netzwerke. Unter der Verwendung von Standardtechnologien wie HTML und JavaScript k?nnen Entwickler interoperable Anwendungen erstellen, die auf den sozialen Graphen des jeweiligen Netzwerks zugreifen.     

Konferenz der Informationsfreiheitsbeauftragten des Bundes und der Länder

Ohne Zusammenfassung Karsten Neumann, Landesbeauftragter für Datenschutz und Informationsfreiheit Mecklenburg-Vorpommern     

Manufacturing of Long Products Made of Innovative Lightweight Materials

The processing of innovative lightweight materials to sheet metal components and assemblies with globally or locally defined properties is the object of this work. It takes a load-dependent design of components and assemblies, for example, based on the composition of different construction materials or a targeted setting of component areas with specified characteristics to fully exploit the lightweight potential when substituting conventionally used materials. Different process chains for the manufacturing of roll-formed long products made of magnesium alloys and high-strength steels with locally defined properties will be presented in this paper. Depending on the kind of material to be formed and the desired product characteristics, different temperature managements are needed for capable processes. Due to limited formability at room temperature, magnesium alloys require a heating of the forming zones above 200–225 °C throughout the bending process in order to activate additional gliding planes and to avoid any failures in the radii. The realization of local hardening effects requires at least one process-integrated heat treatment when roll forming manganese–boron steels. For both processes, it is imperative to realize a heating and cooling down or quenching appropriate for the manufacturing of long products with the required quality. Additionally, proper line speeds that allow a continuously operated economical production have to be considered. Research results including design, FEA, realization and experimentation of the mentioned process chains and strategies will be described in detail.     

Gender identity and coping in female 46, XY adults with androgen biosynthesis deficiency (intersexuality/DSD).

Individuals living with an intersex condition have not received much attention in counseling psychology, although a high need for psychosocial care is obvious. Using a mixed-methods multiple case study with qualitative and quantitative data, the authors explore coping and gender experiences in seven 46, XY intersexual persons with deficiencies of androgen biosynthesis. These were assigned female at birth. At puberty, the participants experienced unexpected physical virilization due to 5alpha-reductase-2 (n = 3) and 17beta-hydroxysteroid dehydrogenase-3 deficiency (n = 4). All 7 received medical treatment (e.g., gonadal removal, genital surgery) to stop virilization and maintain the primarily assigned female sex and gender. The cases illustrate high adjustment challenges caused by the condition itself and the medical treatment experienced. None changed to male during adolescence as reported in previous studies. Highly variable patterns of gender identification become visible with subjectivities that do not only represent a binary gender model. Adult gender identity outcome of the participants is characterized by an increased uncertainty of gender identity, high male and low female gender identity. Implications for clinical management, particularly psychological counseling, are drawn. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Polypropylene composites with enzyme modified abaca fibre

Abaca fibre reinforced PP composites were prepared using a high speed mixer followed by injection moulding with 30 wt.% of fibre load. Prior to composite production, the fibres were modified by fungamix and natural enzyme. The effects of modification of the fibre were assessed on the basis of morphology and thermal resistance and as well as on mechanical, thermal and environmental stress corrosion resistance properties of the resulting composites. Coupling agent (MA-PP) was also used with unmodified abaca fibre to observe the coupling agent effect on resulting composites properties. The moisture absorption of the composites was found to be reduced 20–45% due to modification. Tensile strength found to be 5–45% and flexural strengths found to be 10–35% increased due to modification. Modified fibre composites found to better resistance in acid and base medium.     

Silver Nanoparticles with Controlled Dispersity and Their Assembly into Superstructures

In this paper we report on the influence of particle size distribution, particle substrate interaction, and drying behavior on the self‐assembly process using ligand stabilized silver particles. Two‐dimensional particle arrays were characterized using transmission electron microscopy and extensive image analysis. The formation of such structures was observed in situ using an environmental scanning electron microscope in WET‐STEM mode. The results confirm that a small particle size distribution is crucial for the formation of regular particle patterns with long range order, but also the particle substrate interaction and the particle density have an influence on the degree of ordering. Additionally, we find that separated binary particle assemblies keep the orientation of their two‐dimensional hexagonal lattices over alternating domains of small and big particles. This is probably enabled due to the formation of dislocations and a small change of the course of the lattice lines within the respective boundary.