Device measures fluid drag on test vehicles

Electromechanical drag balance device measures the aerodynamic drag force acting on a vehicle as it moves through the atmosphere and telemeters the data to a remote receiving station. This device is also used for testing the hydrodynamic drag characteristics of underwater vehicles

Air frame drag balance Patent

Device for measuring drag forces in flight test

Competence-Oriented Teaching: Combining Theory and Practice in a Future-Oriented Teacher Education

Linking theory and practice in university teacher education is a necessary condition for the development of didactic competence. With this in mind, we developed a seminar to promote competence-oriented teaching through a continuous exchange of practical expertise with current teachers. As a result, all of the participants (students and teachers) should acquire greater pedagogical knowledge as a central element of their teaching expertise. In order to examine the impact of the seminar, we measured the development of the competence-oriented didactic knowledge of 57 participating students and 6 accompanying teachers. To do so, we used a pre–post design with different control groups. The results show a significant increase in didactic knowledge. But they also show that diagnostic competences need significant further development. Hence, in the future, the seminar will be supplemented by video-based learning elements, which in particular address the difficulty of teaching competences in classrooms with a wide variety of pupils

On generalized language equations

AbstractA system of generalized language equations over an alphabet A is a set of n equations in n variables: Xi = Gi(X1,..., Xn), i = 1,...,n, where the Gi are functions from [P(A*)]n into P(A*), i=1,..., n, P(A*) denoting the set of all languages over A. Furthermore the Gi are expressible in terms of set-operations, concatenations, and stars which involve the variable Xi as well as certain mixed languages. In this note we investigate existence and uniqueness of solutions of a certain subclass of generalized language equations. Furthermore we show that a solution is regular if all fixed languages are regular