TY  - JOUR
A1  - Schusser, Sebastian
A1  - Poghossian, Arshak
A1  - Bäcker, Matthias
A1  - Leinhos, Marcel
A1  - Wagner, Patrick
A1  - Schöning, Michael Josef
T1  - Characterization of biodegradable polymers with capacitive field-effect sensors
JF  - Sensors and actuators B: Chemical
N2  - In vitro studies of the degradation kinetic of biopolymers are essential for the design and optimization of implantable biomedical devices. In the presented work, a field-effect capacitive sensor has been applied for the real-time and in situ monitoring of degradation processes of biopolymers for the first time. The polymer-covered field-effect sensor is, in principle, capable to detect any changes in bulk, surface and interface properties of the polymer induced by degradation processes. The feasibility of this approach has been experimentally proven by using the commercially available biomedical polymer poly(D,L-lactic acid) (PDLLA) as a model system. PDLLA films of different thicknesses were deposited on the Ta₂O₅-gate surface of the field-effect structure from a polymer solution by means of spin-coating method. The polymer-modified field-effect sensors have been characterized by means of capacitance–voltage and impedance-spectroscopy method. The degradation of the PDLLA was accelerated by changing the degradation medium from neutral (pH 7.2) to alkaline (pH 9) condition, resulting in drastic changes in the capacitance and impedance spectra of the polymer-modified field-effect sensor.
KW  - Impedance spectroscopy
KW  - C–V method
KW  - Real-time monitoring
KW  - Poly(d,l-lacticacid)
KW  - (Bio)degradation
KW  - Field-effect sensor
Y1  - 2012
U6  - https://doi.org/10.1016/j.snb.2012.07.099
SN  - 0925-4005
N1  - Part of special issue "Selected Papers from the 14th International Meeting on Chemical Sensors"
VL  - 187
SP  - 2
EP  - 7
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Schwabedal, Justus T. C.
A1  - Sippel, Daniel
A1  - Brandt, Moritz D.
A1  - Bialonski, Stephan
T1  - Automated Classification of Sleep Stages and EEG Artifacts in Mice with Deep Learning
N2  - Sleep scoring is a necessary and time-consuming task in sleep studies. In animal models (such as mice) or in humans, automating this tedious process promises to facilitate long-term studies and to promote sleep biology as a data-driven f ield. We introduce a deep neural network model that is able to predict different states of consciousness (Wake, Non-REM, REM) in mice from EEG and EMG recordings with excellent scoring results for out-of-sample data. Predictions are made on epochs of 4 seconds length, and epochs are classified as artifactfree or not. The model architecture draws on recent advances in deep learning and in convolutional neural networks research. In contrast to previous approaches towards automated sleep scoring, our model does not rely on manually defined features of the data but learns predictive features automatically. We expect deep learning models like ours to become widely applied in different fields, automating many repetitive cognitive tasks that were previously difficult to tackle.
Y1  - 2018
U6  - https://doi.org/10.48550/arXiv.1809.08443
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
T1  - Calculation of the surface stray field and the demagnetizing field of a g.o. 3% SiFe sheet caused by a misoriented grain
JF  - Physica Scripta. 39 (1989), H. 4
Y1  - 1989
SN  - 0031-8949
SP  - 531
EP  - 534
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Boege, P.
A1  - Shanjia, Xu
A1  - Xinzhang, Wu (u.a.)
T1  - Improved conductivity-measurement of semiconductor epitaxial layers by means of the contactless microwave method
JF  - Conference digest : 10 - 14 January 1994, San Diego, California / International Conference on Millimeter and Submillimeter Waves and Applications / Mohammed N. Afsar, chair/ed.
Y1  - 1994
SN  - 0-8194-1558-8
N1  - Serie Proceedings / SPIE, The International Society for Optical Engineering ; 2250
SP  - 649
EP  - 658
PB  - SPIE
CY  - Bellingham, Wash.
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Böttcher, A.
T1  - Mapping of magnetic domain structures inside of ferromagnetic materials by X-ray topography
JF  - Physica Status Solidi (A). 113 (1989)
Y1  - 1989
SN  - 0031-8965
SP  - 551
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Gerschütz, J.
A1  - Scholl, S.
A1  - Fischer, A. (u.a.)
T1  - Quanten-Hall-Effekt in CdTe/Cd1-X MgX Te Heterostrukturen
Y1  - 1995
N1  - Als Poster vorgelegt auf der Frühjahrstagung der DPG in Berlin, 20.-24. März 1995, Verhandl. DPG (VI) 30, HL 33.52 / Physikalisches Institut der Universität Würzburg.
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Heil, Günter
T1  - Modeling and Graphic Presentation of Acid–Base Titration Curves. Presentation of an Alternative Method
JF  - The Chemical Educator. 7 (2002), H. 6
Y1  - 2002
SN  - 1430-4171
SP  - 339
EP  - 346
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Lampey, H.
T1  - The stray-field structure of a HI-B sheet in the vicinity of laser scratches
JF  - Journal of Magnetism and Magnetic Materials. 75 (1988), H. 3
Y1  - 1988
SN  - 0304-8853
SP  - 339
EP  - 344
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Lampey, H.
A1  - Mende, H. H.
T1  - Stray-field profile of single M-shaped Si-Fe transformer sheets and the resulting interaction in a stack
JF  - Physica Scripta. 39 (1989), H. 4
Y1  - 1989
SN  - 0031-8949
SP  - 520
EP  - 522
ER  - 
TY  - JOUR
A1  - Schäfer, Horst
A1  - Mende, H. H.
T1  - Interaction between laminated g.o.3% SiFe sheets due to gap-stray fields and edge peaks
JF  - Physica Scripta. 39 (1989), H. 3
Y1  - 1989
SN  - 0031-8949
SP  - 397
EP  - 400
ER  -