Einleitende Überlegungen zu einer Politischen Bildung für die digitale Öffentlichkeit

Das Ziel, die Lernenden zu befähigen, als selbstbestimmte und -ermächtigte Bürger*innen am Politischen teilzuhaben, verlangt in einer Mediengesellschaft unter anderem danach, jene Systeme verstehen, kritisieren und gestalten zu können, die politische Information kreieren und verbreiten. Um der Komplexität und den Interdependenzen dieser Systeme gerecht zu werden, ist auf verschiedenste Fachbereiche und deren Zugänge zurückzugreifen. Diese bilden die Grundlage, um Lernende zu befähigen, sich selbstbestimmt und emanzipiert mit den gesellschaftspolitischen Fragen des 21. Jahrhunderts auseinanderzusetzen. Basierend auf den Beiträgen dieses Sammelbandes skizzieren wir grundlegende Aspekte einer Politischen Bildung für die digitale Öffentlichkeit

Arrays of High Tilt-Angle Micromirrors for Multiobject Spectroscopy

Micromirror arrays are promising components for generating reflective slit masks in future multiobject spectrographs. The micromirrors, 100 μm times200 μm in size, are etched in bulk single crystal silicon, whereas a hidden suspension is realized by surface micromachining. The micromirrors are actuated electrostatically by electrodes located on a second chip. The use of silicon on insulator (SOI) wafers for both mirror and electrode chip ensures thermal compatibility for cryogenic operation. A system of multiple landing beams has been developed, which latches the mirror at a well-defined tilt angle when actuated. Arrays of 5times5 micromirrors have been realized. The tilt angle obtained is 20deg at a pull-in voltage of 90 V. Measurements with an optical profiler showed that the tilt angle of the actuated and locked mirror is stable with a precision of 1 arcmin over a range of 15 V. This locking system makes the tilt angle independent from process variations across the wafer and, thus, provides uniform tilt angle over the whole array. The surface quality of the mirrors in actuated state is better than 10-nm peak to valley and the local roughness is about 1-nm root mean square

Advancing student teachers’ learning in the teaching practicum through Content-Focused Coaching: A field experiment

A pivotal role of cooperating teachers is to assist student teachers' planning, enacting and reflecting of lessons during the teaching practicum. This study evaluated training sessions in elements of Content-Focused Coaching: 59 cooperating teachers were randomly allocated to a training session in: a) pre-lesson conferences for joint lesson planning, b) core issues for lesson designs, c) both elements or d) another educational topic (control group). Effects on the quality of collaborative exchange in lesson conferences, student teachers’ competency gains, and instructional quality (as reported by pupils) were examined during a three-week teaching practicum. Implications for professional development programs are discussed