Analysis and Mitigation of the CubeSat Dynamic Environment

A vibration model was developed for CubeSats inside the Poly-Picosatellite Orbital Deployer (P-POD). CubeSats are fixed in the Z axis of deployers, and therefore resonate with deployer peaks. CubeSats generally start fixed in the X and Y axes, and then settle into an isolated position. CubeSats do not resonate with deployers after settling into an isolated position. Experimental data shows that the P-POD amplifies vibration loads when CubeSats are fixed in the deployer, and vibration loads are reduced when the CubeSats settle into an isolated position. A concept for a future deployer was proposed that isolates CubeSats from the deployer at the rail interface using viscoelastic foam sandwiched in the deployer rails. By creating an isolator frequency far below the deployer resonant frequency, CubeSats loads are not amplified at the deployer’s resonant peak. Feasibility tests show that CubeSat vibration loads can be reduced to 50% of the vibration input in certain cases. Testing also shows that it is much easier to define vibration loads for isolated CubeSats than CubeSats in the current P-POD

From the workshop of Touareg silversmith Hamid Kumama in Agadez (Niger)

The essay documents and comments on the production of an "Iférouane cross" (silver pendant) using the lost wax process ("cire perdu"). The focus is on the Touareg silversmith Hamid Kumama working in his simple workshop in Agadez in 1973. The original workshop equipment, the simple tools, the traditional typical Touareg jewellery can hardly be found in the Sahel region today – machines and modern trends and designs have partly made the old techniques disappear

Aus der Werkstatt des Touareg-Silberschmiedes Hamid Kumama in Agadez (Niger)

Der Aufsatz dokumentiert und kommentiert die Herstellung eines «Iférouane-Kreuzes» (Silber-Anhänger) im Wachsausschmelzverfahren («cire perdu»). Im Zentrum steht der Touareg-Silberschmied Hamid Kumama, der 1973 in seiner einfachen Werkstatt in Agadez arbeitet. Die ursprüngliche Werkstatteinrichtung, die einfachen Werkzeuge, die traditionellen typischen Touareg-Schmuckstücke sind heute kaum mehr im Sahelgebiet anzutreffen – Maschinen und moderne Trends und Designs haben die alten Techniken teilweise zum Verschwinden gebracht

The origin of the clays of the Roman crucibles from Augusta Raurica (Augst, Switzerland): A study with field and museum work using portable analysis pXRF

The project involved analysing 893 Roman crucibles for non-ferrous alloys from Augus-ta Raurica (Switzerland) using laboratory and portable devices. This resulted in the identification of 5 clay groups, which were compared to 60 reference groups from the surrounding area. Most of the crucible clays came from 2 clay deposits, one of which was located nearby, while the other was situated 50 km away in the Jura region. The metals casted show a large variety of bronze- and brass-alloys, due to scrap-recycling. Brass making by cementation could be proved in many crucibles. The crucibles were composed of two layers: a wheel made core of fired ceramic and a lutum layer made of local materials applied to the exterior (and sometimes a thin engobe applied to the interior). In the casting process, the mechanically stabilising and insulating lutum swelled up and vitrified considerably

Christliche Sozialwissenschaft – eine normative Gesellschaftstheorie in ordnungsethischen und dynamisch-evolutiven Ansätzen

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Das »Erlanger Baby« – eine sozialethische Reflexion

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Kirche und Politik konkret

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