Silke Helfrich

Silke Gnädig

Formale Eigenschaften des SILKE-Ansatzes zur Kontrolle selbstoptimierender Systeme

Im Rahmen des Organic Computing werden auch eingebettete Echtzeitsysteme immer öfter mit selbstoptimierenden Eigenschaften ausgestattet. Die selbsttätige Adaption des Systemverhaltens kann aber potentiell zu kritischen Systemzuständen führen. Für spezielle lernfähige Fuzzy-Systeme wurde der sogenannte SILKE-Ansatz entwickelt, um kontrollierend auf den Selbstoptimierungsprozess einzuwirken und i...

Silke Anger , Michael Kvasnicka , and Thomas Siedler One Last Puff ? – Public Smoking Bans and Smoking Behavior

This paper investigates the short-term eff ects of public smoking bans on individual smoking behavior. In 2007 and 2008, state-level smoking bans were gradually introduced in all of Germany’s sixteen federal states. We exploit this variation in the timing of state bans to identify the eff ect that smoke-free policies had on individuals’ smoking propensity and smoking intensity. Using rich longi...

The effect of shear flow on the Helfrich interaction in lyotropic lamellar systems.

We study the effect of shear flow on the entropic Helfrich interaction in lyotropic surfactant smectic fluids. Arguing that flow induces an effective anisotropic surface tension in bilayers due to a combination of intermonolayer friction, bilayer collisions and convection, we calculate the reduction in fluctuations and hence the renormalised change in effective compression modulus and steady-st...

The one-loop elastic coefficients for the Helfrich membrane in higher dimensions

Using a covariant geometric approach we obtain the effective bending couplings for a 2-dimensional rigid membrane embedded into a (2+D)-dimensional Euclidean space. The Hamiltonian for the membrane has three terms: The first one is quadratic in its mean extrinsic curvature. The second one is proportional to its Gaussian curvature, and the last one is proportional to its area. The results we obt...