TY  - JOUR
A1  - Pasemann, Gregor
A1  - Flemming, Sven
A1  - Alonso, Sergio
A1  - Beta, Carsten
A1  - Stannat, Wilhelm
T1  - Diffusivity estimation for activator-inhibitor models
BT  - theory and application to intracellular dynamics of the actin cytoskeleton
JF  - Journal of nonlinear science
N2  - A theory for diffusivity estimation for spatially extended activator-inhibitor dynamics modeling the evolution of intracellular signaling networks is developed in the mathematical framework of stochastic reaction-diffusion systems. In order to account for model uncertainties, we extend the results for parameter estimation for semilinear stochastic partial differential equations, as developed in Pasemann and Stannat (Electron J Stat 14(1):547-579, 2020), to the problem of joint estimation of diffusivity and parametrized reaction terms. Our theoretical findings are applied to the estimation of effective diffusivity of signaling components contributing to intracellular dynamics of the actin cytoskeleton in the model organism Dictyostelium discoideum.
KW  - Parametric drift estimation
KW  - Stochastic reaction– diffusion
KW  - systems
KW  - Maximum likelihood estimation
KW  - Actin cytoskeleton dynamics
Y1  - 2021
U6  - https://doi.org/10.1007/s00332-021-09714-4
SN  - 0938-8974
SN  - 1432-1467
VL  - 31
IS  - 3
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Stubning, Tobias
A1  - Denes, Istvan
A1  - Gerhard, Reimund
T1  - Tuning electro-mechanical properties of EAP-based haptic actuators by adjusting layer thickness and number of stacked layers
BT  - a comparison
JF  - Engineering research express
N2  - In our fast-changing world, human-machine interfaces (HMIs) are of ever-increasing importance. Among the most ubiquitous examples are touchscreens that most people are familiar with from their smartphones. The quality of such an HMI can be improved by adding haptic feedback-an imitation of using mechanical buttons-to the touchscreen. Thin-film actuators on the basis of electro-mechanically active polymers (EAPs), with the electroactive material sandwiched between two compliant electrodes, offer a promising technology for haptic surfaces. In thin-film technology, the thickness and the number of stacked layers of the electroactive dielectric are key parameters for tuning a system. Therefore, we have experimentally investigated the influence of the thickness of a single EAP layer on the electrical and the electro-mechanical performance of the transducer. In order to achieve high electro-mechanical actuator outputs, we have employed relaxor-ferroelectric ter-fluoropolymers that can be screen-printed. By means of a model-based approach, we have also directly compared single- and multi-layer actuators, thus providing guidelines for optimized transducer configurations with respect to the system requirements of haptic applications for which the operation frequency is of particular importance.
KW  - haptic feedback
KW  - vinylidenefluoride(VDF)-based polymers
KW  - screen-printed
KW  - systems
KW  - thin-film actuators
KW  - multi-layer systems
KW  - equivalent-circuit
KW  - modelling
KW  - electro-mechanically active polymers
Y1  - 2021
U6  - https://doi.org/10.1088/2631-8695/abd286
SN  - 2631-8695
VL  - 3
IS  - 1
PB  - Institute of Physics
CY  - London
ER  -