Andreas Walther

Learn More
Imagine that you are blindfolded inside an unknown room. You snap your fingers and listen to the room's response. Can you hear the shape of the room? Some people can do it naturally, but can we design computer algorithms that hear rooms? We show how to compute the shape of a convex polyhedral room from its response to a known sound, recorded by a few(More)
Nacre-mimicking hybrids of high inorganic content (>50 wt %) tend to show low strain-to-failure. Therefore, we prepared clay nanopaper hybrid composite montmorillonite platelets in a continuous matrix of nanofibrillated cellulose (NFC) with the aim of harnessing the intrinsic toughness of fibrillar networks. Hydrocolloid mixtures were used in a filtration(More)
Fibrous architectures are among the most abundant loadcarrying materials in nature, encompassing molecular level peptide assemblies (e.g., amyloids), supramolecular protein materials (e.g., collagen), colloidal level native cellulose nanofi brils (nanofi brillated cellulose, NFC), through to macroscale spider silk. [ 1 , 2 ] NFC, also denoted as microfi(More)
Beyond the crew cut: Highly asymmetric block copolymers self-assemble into microparticles with inverse morphologies far beyond the crew-cut regime. These particles enclose highly ordered channel systems with simple cubic, double diamond, and hexagonally packed hollow-hoop symmetry. The extensive interface and confinement of these particles could enable(More)
Just noticeable differences in interaural correlation (ρ-jnds) from diffuse sound field reference correlations are obtained. In a three-interval, three-alternative forced-choice procedure, ρ-jnds are measured for positive and negative deviations from nine narrowband reference conditions. Stimuli are 1 equivalent rectangular bandwidth wide noise bursts with(More)
We investigate the self-assembly behavior of Janus particles with different geometries at a liquid-liquid interface. The Janus particles we focus on are characterized by a phase separation along their major axis into two hemicylinders of different wettability. We present a combination of experimental and simulation data together with detailed studies(More)
A sacrificial templating process using lithographically printed minimal surface structures allows complex de novo geo-metries of delicate hydrogel materials. The hydrogel scaffolds based on cellulose and chitin nanofibrils show differences in terms of attachment of human mesenchymal stem cells, and allow their differentiation into osteogenic outcomes. The(More)
Materials based on biodegradable polyesters, such as poly(butylene terephthalate) (PBT) or poly(butylene terephthalate-co-poly(alkylene glycol) terephthalate) (PBTAT), have potential application as pro-regenerative scaffolds for bone tissue engineering. Herein, the preparation of films composed of PBT or PBTAT and an engineered spider silk protein,(More)
The pretreatment anxiety level is supposed to be a very important unspecific treatment factor. Main purpose of this study is to test whether the patients' pretreatment anxiety level is a general or a specific predictor of treatment response and whether mildly, moderately, and severely anxious patients can be differentially characterized by other diagnostic(More)