TY  - JOUR
A1  - Daschewski, Maxim
A1  - Kreutzbruck, Marc
A1  - Prager, Jens
A1  - Dohse, Elmar
A1  - Gaal, Mate
A1  - Harrer, Andrea
T1  - Resonance-free measuring and excitation of ultrasound
JF  - Technisches Messen : tm ; Plattform für Methoden, Systeme und Anwendungen der Messtechnik
N2  - In this contribution we present innovative methods for broadband and resonance-free sensing and emitting of ultrasound. The sensing method uses a polyethylene foil and a laser vibrometer as a broadband and resonance-free sound receiver. In general, this method enables absolute measurement of sound particle velocity and sound pressure in arbitrary, laser beam transparent liquids and gases with known density and sound velocity. The resonance-free emitting method is based on the electro-thermo-acoustic principle and enables, contrary to conventional ultrasound transducers, generation of arbitrary shaped acoustic signals without resonances and post-oscillations.
KW  - Ultrasound
KW  - transfer function
KW  - characterization of ultrasonic measurement systems
KW  - thermo-acoustic ultrasound emitter
Y1  - 2015
U6  - https://doi.org/10.1515/teme-2014-0020
SN  - 0171-8096
VL  - 82
IS  - 3
SP  - 156
EP  - 166
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Riese, Josef
A1  - Kulgemeyer, Christoph
A1  - Zander, Simon
A1  - Borowski, Andreas
A1  - Fischer, Hans E.
A1  - Gramzow, Yvonne
A1  - Reinhold, Peter
A1  - Schecker, Horst
A1  - Tomczyszyn, Elisabeth
T1  - Modeling and Measurement of Professional Knowledge in Physics Teacher Training
JF  - Zeitschrift für Pädagogik
N2  - For improving teacher education, there has been an increasing interest in describing teachers' professional competencies and their development in the course of implementing educational programs. The focus of the present project is on modeling and measuring domain-specific and generic competencies that future physics teachers acquire during their university studies. The model comprises characteristics and relationships between physics content knowledge, pedagogical content knowledge, and skills for explaining physics phenomena. Based on the model, assessment instruments were developed and applied as paper-and-pencil-tests and videotaped expert-novice dialogues for measuring the competencies in a large sample of physics student teachers. Trials and validation suggest that our instruments are valid in terms of content and construct validities.
KW  - Professional Knowledge
KW  - Student Teachers
KW  - Physics
KW  - Competencies
KW  - Validity
Y1  - 2015
SN  - 0044-3247
SP  - 55
EP  - 79
PB  - Beltz
CY  - Weinheim
ER  - 
TY  - THES
A1  - Anielski, Alexander
T1  - Entwicklung einer mikrofluidischen, adaptiv geregelten Messapparatur zur quantitativen Untersuchung von Chemotaxis mit Hilfe der Flussfotolyse
KW  - Flussfotolyse
KW  - Konzentration
KW  - Chemotaxis
KW  - Mikrokanal
KW  - Dictyostelium
KW  - flow photolysis
KW  - concentration
KW  - chemotaxis
KW  - microchannel
KW  - Dictyostelium
Y1  - 2015
ER  - 
TY  - THES
A1  - Deresch, Andreas
T1  - Modellierung von Röntgenspektren für technische Anwendungen
Y1  - 2015
ER  - 
TY  - THES
A1  - Holländer, Lars
T1  - Einfluss der remanenten Polarisation auf die optischen Transmissionseingenschaften eines ferroelektrischen Polymers mit nematischen Flüssigkristalleinschlüssen
Y1  - 2015
ER  - 
TY  - THES
A1  - Ermilova, Elena
T1  - Breitbandige dielektrische Charakterisierung biologisch relevanter Polymere
Y1  - 2015
ER  -